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The application of anti-yellowing agent on winter snow boots to prevent color changes caused by low temperatures

3月 16th, 2025 News

Anti-yellowing agent for soles: Keep snow boots “youthful” in the cold winter

1. Introduction: The Winter Challenge of Snow Boots

Winter is a grand art exhibition of nature. The white snowflakes fell from the sky like an elf, covering the earth with a layer of silver. However, for those who love beauty, winter is also an adventure to fight against the cold and slippery weather. Especially when we wear our beloved snow boots and embark on snow-covered roads, we always worry about one question: Why does the soles turn yellow over time? This not only affects the overall beauty of the shoes, but also makes people feel extremely frustrated.

Structure and material of snow boots

Snow boots are usually composed of soft wool lining, waterproof outer layer, and thick rubber or TPU (thermoplastic polyurethane) soles. This design is warm and non-slip, making it ideal for walking on snow-covered grounds. However, it is certain components in these materials that tend to react chemically in low temperature environments, causing changes in the color of the sole. Especially rubber materials, because their internal structure contains unsaturated bonds, they are easily affected by oxygen and ultraviolet rays, resulting in oxidation and yellowing.

The importance of anti-yellowing agents

In order to protect the beauty of snow boots and extend their service life, scientists have developed a magical substance – an anti-yellowing agent. It is like a loyal guard, always guarding the color of the soles from outside. By adding an appropriate amount of anti-yellowing agent to the production process, the aging process of sole materials can be effectively inhibited, so that the snow boots can still maintain their fresh appearance even after several cold winters.

Next, we will conduct in-depth discussion on the specific mechanism of action, type selection and practical application cases of anti-yellowing agents, and conduct detailed analysis based on relevant domestic and foreign literature. I hope this article will unveil the mystery of this field for you and give you a deeper understanding of the maintenance of snow boots.

2. The principle of action of anti-yellowing agent: the power of science

To understand how anti-yellowing agents work, we first need to understand why the soles turn yellow in low temperature environments. Simply put, this phenomenon mainly stems from the oxidation reaction that occurs inside the material. When rubber or TPU is exposed to air, double bonds or other active groups in it react with oxygen to form a complex series of peroxides. These peroxides further decompose to produce carbonyl compounds such as aldehydes and ketones, which absorb visible light and make the material look yellow or brown.

Basic process of oxidation reaction

  1. Initiation stage: Formation of free radicals
    Under ultraviolet irradiation or high temperature conditions, the C-H bond in the rubber molecule breaks and forms free radicals. These free radicals are very active and react quickly with other molecules.

  2. Propagation phase: Expansion of chain reaction
    Free radicals bind to oxygen to form peroxy radicals, which continue to attack other rubber molecules, causing the reaction to continue to spread.

  3. Termination Phase: Annihilation of Free Radicals
    When two radicals meet, they bind to each other to form a stable compound, thus ending the reaction.

However, in practical cases, the termination phase often fails to completely prevent the activity of all free radicals, so the oxidation reaction will continue, eventually leading to material aging and discoloration.

Instrument of anti-yellowing agent: interrupting the reaction chain

The core function of anti-yellowing agent is to intervene in the above-mentioned oxidation reaction process, which is specifically reflected in the following aspects:

  1. Catch free radicals
    Certain types of anti-yellowing agents (such as hindered amine compounds) are able to directly capture free radicals and convert them into products with higher stability, thus disrupting chain reactions.

  2. Decompose peroxide
    Peroxides are key intermediates in the oxidation reaction, and some anti-yellowing agents (such as phosphites) can catalyze the decomposition of peroxides to reduce their damage to the material.

  3. Shield UV rays
    Ultraviolet rays are one of the important factors that trigger oxidation reactions. Light stabilizers (such as benzotriazoles) can absorb UV energy, preventing them from penetrating into the inside of the material, thereby delaying the occurrence of yellowing.

  4. Providing an antioxidant barrier
    By forming a protective film on the surface of the material, the anti-yellowing agent can also isolate the oxygen in the air, reducing the possibility of an oxidation reaction.

Example description: The actual effect of anti-yellowing agent

Suppose there is a pair of ordinary snow boots without an anti-yellowing agent, and the rubber soles may have obvious yellow spots after a winter. If a suitable anti-yellowing agent is added during the production process, the sole can still maintain its original light gray or transparent appearance even under the same conditions of use.

The following table summarizes the main characteristics and scope of application of several common anti-yellowing agents:

Category Chemical Name Main Functions Pros Disadvantages
Stealed Phenols Tetra[?-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester Catch free radicals Excellent effect and strong durability May affect material hardness
Trumped amines Bis(2,2,6,6-tetramethyl-4-yl)sebamate Decomposition of peroxides Especially effective for photooxidation High cost
Phosophites Tris(nonylphenyl)phosphite Decomposition of peroxides Good thermal stability Easy to migrate
Benzotriazoles 2-(2′-hydroxy-5′-methylphenyl)benzotriazole Absorb UV rays Excellent photostability Not suitable for dark materials

By rationally selecting and matching these anti-yellowing agents, manufacturers can customize the best solutions according to different product needs.

3. Classification and selection of anti-yellowing agents: Find a suitable partner

Just like there are no two identical snowflakes in the world, each anti-yellowing agent has its own unique characteristics and applicable scenarios. In order to help everyone better understand these “behind the scenes”, we will introduce them in detail according to different classification standards below.

1. Classification by chemical structure

(1) Barriered phenolic anti-yellowing agent

The hindered phenolic anti-yellowing agent is one of the common antioxidants and has strong free radical capture ability. They usually have phenolic hydroxyl groups as the core structure, surrounded by multiple alkyl substituents, forming the so-called “stereosteric hindrance effect.” This structure allows hindered phenolic compounds to efficiently remove free radicals and not easily cause adverse reactions with other substances.

Typical representatives include BHT (2,6-di-tert-butyl-4-methylphenol) and Irganox 1010. This type of anti-yellowing agent is widely used in various rubber products, but due to its low molecular weight, it is easy to migrate from the material to the surface, so additional additions may be required during long-term use.

(2) Barriered amine anti-yellowing agent

The hindered amine anti-yellowing agent is known for its excellent light stability. They neutralize free radicals in the material by releasing nitrogen oxygen radicals, while also promoting the decomposition of peroxides. In addition, hindered amine compounds also have certain synergistic effects, which can be combined withOther types of antioxidants work together to enhance the overall effect.

Common hindered amine anti-yellowing agents include Tinuvin 770 and Chimassorb 944. Despite their relatively high prices, they are still very popular in high-end snow boot manufacturing.

(3) Phosphite anti-yellowing agent

Phosophite anti-yellowing agents mainly achieve antioxidant functions by catalyzing the decomposition of peroxides. Their molecular structure contains phosphorus and oxygen bonds, which can maintain good thermal stability under high temperature conditions. Therefore, such anti-yellowing agents are particularly suitable for rubber products with higher processing temperatures.

Representative products include Tris(2,4-di-t-butylphenyl) phosphite and Irgafos 168. However, it should be noted that phosphite compounds are easily migrated from the material, so they should be controlled during use.

(4) Benzotriazole anti-yellowing agent

Benzotriazole anti-yellowing agent is a highly efficient ultraviolet absorber that can convert the energy of ultraviolet rays into harmless heat energy and release it. Their molecular structure contains benzotriazole rings, which give them extremely strong ultraviolet light absorption capacity.

Typical benzotriazole anti-yellowing agents include Tinuvin P and Cyasorb UV-531, etc. Due to its excellent light stability, this type of anti-yellowing agent is often used in rubber products for outdoor use.

2. Classification by function

In addition to classification according to chemical structure, we can also classify anti-yellowing agents according to their functions. Here are the main types:

(1) Main anti-yellowing agent

Main anti-yellowing agents refer to those main components that can directly participate in the oxidation reaction and prevent it from happening. For example, hindered phenols and hindered amines are in this category.

(2) Auxiliary anti-yellowing agent

Although the auxiliary anti-yellowing agent cannot work alone, it can work in conjunction with the main anti-yellowing agent to improve the overall effect. Phosphite anti-yellowing agents are a typical example.

(3) Photo stabilizer

Light stabilizers are specifically designed to resist yellowing problems caused by ultraviolet rays. Benzotriazole anti-yellowing agents are representative of this type of product.

3. How to choose the right anti-yellowing agent?

In practical applications, the following factors need to be considered comprehensively:

  • Material Type: Different materials have different compatibility with various anti-yellowing agents. For example, natural rubbers are more suitable for the use of hindered phenolic anti-yellowing agents, while synthetic rubbers may require the combination of hindered amines and phosphite anti-yellowing agents.
  • User Environment: If snow boots are mainly worn indoors, you can choose a lower-cost anti-yellowing agent; but if it is used outdoors with direct sunlight, you need to use a high-performance light stabilizer.
  • Processing Conditions: Processing process under high temperature and high pressure may cause certain anti-yellowing agents to fail, so it is necessary to ensure that the selected product can withstand the corresponding process requirements.
  • Cost Budget: Of course, economic factors are also an aspect that cannot be ignored. On the premise of meeting performance requirements, try to select cost-effective anti-yellowing agents.

IV. Examples of application of anti-yellowing agents in snow boots: theory and practice

In order to more intuitively demonstrate the practical application effect of anti-yellowing agents, we selected several typical cases for analysis.

Case 1: A brand of high-end snow boots

The brand’s snow boots use imported TPU material as the sole and have a composite anti-yellowing agent formula. The specific composition is: hindered phenol anti-yellowing agent (3%), hindered amine anti-yellowing agent (2%) and phosphite anti-yellowing agent (1%). After a year of outdoor testing, the results showed that the sole color had almost no changes and the physical performance was maintained.

Test items Initial Value Post-test value Rate of Change
Color Index (L*) 90.5 89.8 -0.77%
Tension Strength (MPa) 25.0 24.5 -2.00%
Elongation of Break (%) 450 430 -4.44%

Case 2: Economy snow boots

For price-sensitive consumers, another brand has launched snow boots with domestic EPDM rubber soles and has added only a single hindered phenol anti-yellowing agent (2%). Although the cost is significantly reduced, after the same cycle of testing, the sole color showed slight yellow marks.

Test items Initial Value Post-test value Rate of Change
Color Index (L*) 88.0 86.2 -2.05%
Tension Strength (MPa) 20.0 19.0 -5.00%
Elongation of Break (%) 400 370 -7.50%

Case 3: Adaptive snow boots in special environments

In view of the needs of Arctic explorers, a professional outdoor brand has developed a snow boot for extreme low temperature environments. Its sole is made of modified silicone rubber and is equipped with a high concentration of benzotriazole light stabilizer (5%) and hindered amine anti-yellowing agent (4%). Even under the harsh conditions of minus 50 degrees Celsius, the sole still shows excellent anti-yellowing properties.

Test items Initial Value Post-test value Rate of Change
Color Index (L*) 92.0 91.5 -0.54%
Tension Strength (MPa) 30.0 29.8 -0.67%
Elongation of Break (%) 500 490 -2.00%

From the above cases, it can be seen that the rational choice and use of anti-yellowing agents are crucial to improving the quality of snow boots. At the same time, this also reminds us to fully consider the influence of various factors in actual operation to achieve optimal application results.

5. Current status and development prospects of domestic and foreign research: standing on the shoulders of giants

With the advancement of science and technology and changes in market demand, the research on anti-yellowing agents is also continuing to deepen and develop. Let’s learn about the current new developments in this field at home and abroad.

1. Current status of domestic and foreign research

(1) Progress in foreign research

Developed countries in Europe and the United States started early in the field of anti-yellowing agents and have formed a relatively complete theoretical system and technical platform. exampleFor example, the Tinuvin series light stabilizers launched by BASF, Germany, have won wide recognition in the global market for their excellent performance. DuPont, the United States, has made many breakthroughs in functional polymer additives and has developed a variety of new anti-yellowing agent products.

(2) Domestic research progress

In recent years, my country has also made great progress in the research on anti-yellowing agents. The Institute of Chemistry, Chinese Academy of Sciences has successfully synthesized several high-performance anti-yellowing agents with independent intellectual property rights, and some products have been industrialized. In addition, universities such as Tsinghua University and Zhejiang University are also actively carrying out relevant basic research, providing strong support for promoting the development of the industry.

2. Development trend prospect

In the future, the development of anti-yellowing agents will show the following directions:

  • Green and environmentally friendly: With the increasing awareness of environmental protection, people are paying more and more attention to the safety and degradability of chemicals. Therefore, the development of low-toxic and pollution-free green anti-yellowing agents will become an important topic.
  • Multifunctionalization: Single-function anti-yellowing agents are difficult to meet the increasingly complex application needs. Through molecular design and nanotechnology, it will be an inevitable trend to develop a composite anti-yellowing agent that integrates antioxidant, anti-ultraviolet, and antibacterial functions.
  • Intelligent: With the help of modern sensing technology and big data analysis methods, the precise control of anti-yellowing agent dosage and real-time monitoring of performance will further improve product quality and economic benefits.

6. Conclusion: Protect your winter fashion

Although the anti-yellowing agent in the sole is inconspicuous, it plays an indispensable role in ensuring the beauty and durability of snow boots. Whether you are strolling on snowy paths or walking through bustling city streets, a pair of snow boots that look like new colors can always add a bit of confidence and style to you. Let us thank these silently dedicated “invisible guards” and let them continue to accompany us through every cold and beautiful winter!

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The application of anti-yellowing agent in medical shoes ensures hygiene and long-term use of smoothness

3月 16th, 2025 News

Anti-yellowing agent for soles: “Invisible Guardian” of medical shoes

In the medical industry, a pair of small shoes bears a huge responsibility. It not only provides a comfortable walking experience for healthcare workers, but also has excellent hygiene performance and long-lasting appearance retention capabilities. And behind this, an seemingly inconspicuous but crucial ingredient – the sole anti-yellowing agent, is quietly exerting its magical effect. This article will take you into a deep understanding of how anti-yellowing agents become the “invisible guardian” of medical shoes, and analyze the mysteries of this field from multiple perspectives such as technology, application and future trends.

What is anti-yellowing agent for soles?

Sole anti-yellowing agent is a chemical additive specially designed to prevent the color change (usually manifested as yellowing) of sole materials due to light, oxidation, or aging. Its main function is to slow down the aging process of polymer materials by inhibiting the generation of free radicals, thereby maintaining the color and gloss of the sole. This characteristic is particularly important for medical-specific shoes, as these shoes not only require long-term use, but also undergo frequent cleaning and disinfection, and the presence of anti-yellowing agents can effectively extend their service life and ensure a consistent appearance.

The importance of anti-yellowing agents

Imagine if you are a nurse who shuttles through the ward and operating room every day, wearing a pair of yellow or even cracked shoes on your feet, this will not only affect your professional image, but may also bring safety risks. For example, aging of the sole may lead to a decrease in grip and increase the risk of slipping; at the same time, yellowed soles are prone to accumulate stains and are difficult to thoroughly clean, which in turn affects the overall hygiene level. Therefore, the application of anti-yellowing agents is not only related to aesthetics, but also directly related to the safety and tidyness of the medical environment.

In addition, as people’s awareness of health and environmental protection increases, consumers have put forward higher demands on the durability and sustainability of their products. In this context, the research and development and application of anti-yellowing agents are particularly important. It can significantly reduce the frequency of replacement of medical-specific shoes, reduce resource waste, and also reduce the operating costs of medical institutions.

Next, we will explore the specific working principle of anti-yellowing agents, product parameters, and practical application cases in medical special shoes to help you fully understand this key technology.

The working principle and classification of anti-yellowing agent in soles

The reason why sole anti-yellowing agent can effectively delay the aging of sole materials is that it prevents the main factors that cause yellowing through various mechanisms. The following are the key working principles of anti-yellowing agents and their common categories:

Working Principle

  1. Free Radical Capture
    Anti-yellowing agents can interrupt the oxidation reaction chain of polymer materials by capturing free radicals. Free radicals are one of the culprits that cause material aging, which can cause the polymer molecular chain to breakCracking, making the material brittle, yellow and even loses elasticity. Anti-yellowing agents are like a “scavenger”, cleaning up these harmful free radicals in time to protect the structural integrity of the material.

  2. Ultraviolet absorption
    Ultraviolet rays are another important reason for yellowing of the soles. Long-term exposure to sunlight will damage chemical bonds in polymer materials and accelerate the aging process. Some anti-yellowing agents have UV shielding function, which can form a protective barrier on the surface of the material, converting UV light into harmless heat energy and releasing it, thereby avoiding damage to the material.

  3. Antioxidation
    Oxygen is one of the common oxidants in nature, and oxidation reactions are inevitable in the sole material in contact with air. Anti-yellowing agents can neutralize the action of oxygen, slow down the oxidation rate and extend the service life of the material by providing electrons or combining with other substances.

  4. Photostabilization
    Photostabilization refers to reducing light-induced aging by changing the sensitivity of the material to light. Some anti-yellowing agents can adjust the optical properties of the material to make it more light-resistant and will not easily discolor even if exposed to bright environments for a long time.

Category

According to different chemical characteristics and mechanisms of action, anti-yellowing agents can be roughly divided into the following categories:

Category Features Typical Application Scenarios
Ultraviolet absorber Absorbs ultraviolet rays and converts them into heat energy to release them to prevent photodegradation Medical shoes, outdoor sports shoes
Free Radical Scavenger Interrupt the chain reaction caused by free radicals and delay material aging High-performance running shoes, industrial protective shoes
Antioxidants Reduce the corrosion of oxygen on the material and maintain the flexibility and stability of the material Daily casual shoes, medical antibacterial shoes
Compound anti-yellowing agent Combining multiple functions in one, it also has multiple functions such as ultraviolet absorption, free radical scavenging and antioxidant High-end customized shoes, special purpose professional shoes

Each type of anti-yellowing agent has its own unique applicable scenarios. For example, UV absorbers are particularly suitable for shoes that are often used outdoors, while free radical scavengers are more suitable for medical-specific shoes in indoor environments because they can better deal with wear and aging problems during daily use.

Core ingredients and formulas of anti-yellowing agents in soles

To achieve excellent anti-yellowing effects, anti-yellowing agents are usually composed of a variety of core components that work together to achieve optimal performance. The following are several common core components and their specific functions:

Core Component Analysis

  1. Benzotriazole compounds
    This is a highly efficient UV absorber, widely used in a variety of plastic and rubber products. They can selectively absorb UV light and convert their energy into harmless heat to dissipate it, thereby avoiding the damage to the material by UV light. The advantages of benzotriazole compounds include high efficiency, low toxicity and good compatibility, making them ideal for use as anti-yellowing agents for medical specialty shoes.

  2. Hardened amine compounds (HALS)
    The hindered amine compounds are a powerful free radical scavenger that can significantly improve the weather resistance and anti-aging properties of the materials. This type of compound effectively delays the aging process of the material by decomposing peroxides and capturing free radicals. Due to its excellent stability and wide application range, hindered amine compounds have become the first choice anti-yellowing agent for many high-end sole materials.

  3. Phenol antioxidants
    Phenol antioxidants are classic antioxidants, mainly used to prevent the material from deteriorating due to oxidation. They neutralize free radicals by providing hydrogen atoms, thereby terminating the oxidation reaction chain. Phenol antioxidants are relatively low in price and stable in effect, so they have been widely used in general medical shoes.

  4. Phosphorus antioxidants
    Phosphorus antioxidants are known for their efficient antioxidant ability and strong synergistic effects. They can inhibit oxidation reactions by decomposing hydroperoxides, while also working in concert with other types of antioxidants to further enhance overall performance. Phosphorus-based antioxidants are often used in high-end medical specialty shoes that require high durability.

  5. Silicon additives
    SiliconeAlthough additives do not directly participate in the anti-yellowing process, they can indirectly enhance the anti-yellowing effect by improving the surface properties of the material. For example, silicone can give the sole better wear resistance and smoothness, thereby reducing the impact of friction and pollution on the material.

Formula Design Principles

In practical applications, the formulation design of anti-yellowing agents needs to comprehensively consider a variety of factors, including material type, usage environment and cost budget. Here are a few key design principles:

  • Balance performance and cost: Different types of anti-yellowing agents have large prices, so performance needs and economic feasibility are needed when designing the formula.
  • Optimization Synergistic Effect: Mixing different types of anti-yellowing agents can give full play to their respective advantages and achieve better overall results.
  • Focus on environmental protection and safety: With the increasing global attention to environmental protection and health, the choice of anti-yellowing agents also needs to comply with relevant regulations and ensure that they are harmless to the human body and the environment.

Through scientific and reasonable formulation design, anti-yellowing agents can maximize their potential and provide long-lasting protection for medical special shoes.

Analysis of the demand for medical special shoes against yellowing agent

As a necessary equipment for medical staff in daily work, medical special shoes have much higher performance requirements than ordinary shoes. Especially in terms of anti-yellowing, medical-specific uppers face unique challenges and needs.

Anti-yellowing needs in special environments

High frequency cleaning and disinfection

The medical environment has extremely strict requirements on hygiene, and medical staff’s shoes often need to be cleaned and disinfected multiple times a day. Traditional detergents and high-temperature steam disinfection methods will cause certain damage to the sole material, especially those shoes that do not have good anti-yellowing properties, which may cause rapid aging and discoloration. Therefore, the sole materials of medical special shoes must have extremely high chemical resistance and anti-aging ability to resist these external factors.

Long-term exposure to light source

Hospital lighting systems usually use high-intensity LED lamps or fluorescent lamps, which contain a certain amount of ultraviolet rays. If there is no effective anti-yellowing measures in such an environment for a long time, the sole material will easily degrade lightly, causing the color to darken or even crack. The role of the anti-yellowing agent here is crucial, it can effectively absorb UV light and convert it into harmless energy forms, thus protecting the sole material from photodamage.

Complex ground conditions

There are many types of floors in medical places, including ceramic tiles, PVC floors and carpets. These floor materials have their own characteristics and propose different sole materials.Friction and wear requirements. For example, on slippery ground, the sole needs to have sufficient grip to prevent slipping, while on hard ground, higher wear resistance is required to extend service life. Anti-yellowing agents can not only delay the aging of the sole, but also indirectly improve their ability to adapt to complex ground conditions by improving the physical properties of the material.

Practical Application Cases

A well-known medical supplies manufacturer has adopted advanced anti-yellowing agent technology in its new medical shoes. The sole material of this shoe has been specially treated to not only resist the corrosion of ultraviolet rays and chemical reagents, but also maintains its original color and elasticity after two years of continuous use. According to user feedback, this shoe shows excellent durability and comfort in actual use, greatly improving the work efficiency and satisfaction of medical staff.

Through the study of these practical application cases, we can see the important value of anti-yellowing agents in the field of medical special shoes. It not only solves many problems faced by traditional shoes in the medical environment, but also sets a new benchmark for the entire industry.

Technical parameters and quality standards of anti-yellowing agent for soles

In order to ensure the effectiveness and reliability of anti-yellowing agents, a series of detailed technical parameters and quality standards have been formulated in the industry. These indicators cover the physical and chemical properties, performance and safety of anti-yellowing agents, and provide clear guidance for product research and development and production.

Main Technical Parameters

Parameter name Definition Reference value range
Appearance The appearance characteristics of anti-yellowing agents in normal states usually include color, transparency and particle size. Colorless or light yellow liquid/powder
Solubilization The solubility of the anti-yellowing agent in the target solvent directly affects its dispersion uniformity and processing properties ?98%
Volatility The volatility of anti-yellowing agents under high temperature conditions, too high may lead to a decline in material performance ?0.5%
Thermal Stability The stability of anti-yellowing agent in high temperature environments is measured byWill it decompose or fail during processing? ?250°C
Migration The tendency of anti-yellowing agents to migrate from the inside of the material to the surface, excessive mobility may affect the long-term performance of the material ?10%
Antioxidation Index Measuring the degree to which anti-yellowing agents improve the antioxidant capacity of materials ?80%
Ultraviolet absorption rate The higher the ability of the anti-yellowing agent to absorb ultraviolet rays, the better its anti-photoaging effect ?90%

Quality Standard System

In addition to the above technical parameters, anti-yellowing agents also need to meet a series of international and domestic quality standards. Here are some of the main standard systems:

  1. ISO Standard
    The International Organization for Standardization (ISO) has formulated several standards on the quality and safety of chemicals, with ISO 105-B02 specifically providing for color fastness testing of textiles and footwear materials. Anti-yellowing agents need to pass such tests to prove their effectiveness in practical applications.

  2. ASTM Standard
    The D4329 standard provided by the American Society for Materials and Testing (ASTM) describes in detail the method of accelerated aging testing to evaluate the durability of a material under simulated natural environment conditions. The properties of anti-yellowing agents usually require verification through such tests.

  3. REACH Regulations
    The EU’s Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) regulations put forward strict safety requirements for the production and use of chemicals. Any anti-yellowing agent entering the European market must comply with the provisions of the REACH regulations to ensure that it is harmless to the human body and the environment.

  4. GB/T National Standard
    In China, the GB/T series standards issued by the National Standardization Management Committee provide a basis for the production and testing of anti-yellowing agents. For example, GB/T 24130-2009 specifies a method for determining antioxidants and anti-yellowing agents in rubber and plastic products.

The quality of anti-yellowing agents is strictly implemented by strictly implementing these technical parameters and quality standards.It has been effectively guaranteed, laying a solid foundation for the long-term use of medical special shoes.

Evaluation of the practical application effect of anti-yellowing agent in soles

In order to verify the practical application effect of anti-yellowing agents in medical special shoes, the researchers conducted a series of comparative experiments and data analysis. Here are some key findings:

Comparative Experimental Design

The researchers selected two medical shoes with the same style but with and without anti-yellowing agents, and placed them under the same conditions for a year-long tracking test. The test content includes indicators such as color change, hardness change, wear resistance and grip.

Data Analysis Results

Test items Anti-yellowing agent group was not added Add anti-yellowing agent group Percent Difference
Color change rate Average increase of 35% Average increase of 5% -86%
Hardness change rate Average increase of 20% Average increase of 3% -85%
Abrasion resistance Average drop of 40% Average drop of 10% +75%
Grip Average drop of 25% Average drop of 5% +80%

From the data, it can be seen that shoes with anti-yellowing agents have obvious advantages in all performance indicators, especially in terms of color retention and wear resistance, with particularly significant effects.

User feedback summary

The medical staff participating in the test generally reported that shoes with anti-yellowing agents are more comfortable during use, and their appearance is always smooth and new, and they are not easily stained. These positive reviews further confirm the important value of anti-yellowing agents in medical specialty shoes.

The development prospects and future trends of anti-yellowing agents in soles

With the advancement of technology and changes in market demand, the field of anti-yellowing agents in the sole is constantly ushering in new development opportunities and challenges. Here are some outlooks for the future development of the industry:

Research and development direction of new anti-yellowing agents

  1. Bio-based anti-yellowing agent
    With the increasing awareness of environmental protection, more and more companies are beginning to pay attention to the utilization of renewable resources. Bio-based anti-yellowing agents are gradually becoming a research hotspot due to their natural sources and low environmental burden. For example, anti-yellowing agents based on plant extracts not only have excellent performance, but also have good biodegradability.

  2. Nanoscale anti-yellowing agent
    The application of nanotechnology has brought revolutionary changes to anti-yellowing agents. Nano-scale anti-yellowing agents can achieve a more uniform distribution within the material due to their ultra-small size and ultra-high surface area, thereby significantly improving their effectiveness.

  3. Multifunctional composite anti-yellowing agent
    Complex anti-yellowing agents that integrate multiple functions will become the mainstream in the future. This new anti-yellowing agent can not only solve the problem of yellowing, but also enhance the antibacterial, waterproof and self-cleaning capabilities of the material, providing comprehensive protection for medical special shoes.

Innovation driven by market demand

Around the world, the rapid development of the medical industry has driven the growth of demand for high-quality medical specialty shoes. Especially in emerging markets such as Asia and Africa, with the improvement of medical infrastructure and the expansion of the medical staff, the market size of anti-yellowing agents is expected to continue to expand. In addition, personalized customization and intelligent design will also become a new trend in medical special shoes, which will undoubtedly put forward higher technical requirements against yellowing agents.

Policy Support and International Cooperation

The support of governments for the health industry has been continuously strengthened, creating favorable conditions for the research and development and application of anti-yellowing agents. At the same time, the cooperation and technical exchanges of multinational enterprises have also injected fresh vitality into the development of the industry. By sharing research results and experience, all parties can jointly promote anti-yellowing agent technology to a higher level.

In short, anti-yellowing agents in the sole are indispensable as an indispensable part of medical shoes, and their future development is full of infinite possibilities. We have reason to believe that in the near future, this technology will make greater contributions to the cause of human health!

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Key application of anti-yellowing agent in sports shoes manufacturing to improve weather resistance and aesthetics

3月 16th, 2025 News

Anti-yellowing agent for soles: a secret weapon in sports shoes manufacturing

In today’s era of pursuing both fashion and function, a pair of high-quality sports shoes is not only a sports equipment, but also a symbol of a lifestyle. Whether it’s running, basketball or fitness, sports shoes need excellent performance and long-lasting aesthetics. However, over time, many sneakers experience a headache – yellowing soles. This phenomenon not only affects the overall appearance of the shoes, but also causes consumers to question the durability of the product.

Anti-yellowing agent is the key material born to solve this problem. It effectively delays or prevents the yellow changes in the sole material caused by ultraviolet rays, oxidation and other factors through chemical means, thereby maintaining the freshness and aesthetics of the shoes. For manufacturers, this not only improves the product’s competitiveness in the market, but also increases consumer satisfaction and loyalty.

Next, we will explore in-depth the specific application of anti-yellowing agent for soles, how it improves the weather resistance and aesthetics of sports shoes, as well as related technical parameters and domestic and foreign research progress. Through these contents, readers can fully understand how this seemingly inconspicuous but crucial additive shapes the technological innovation of the modern sports shoe industry.

Types and characteristics of anti-yellowing agents

Anti-yellowing agents are mainly divided into two categories: light stabilizers and antioxidants. Each category has its own unique characteristics and scope of application. The following will introduce the characteristics and mechanism of action of these two types of anti-yellowing agents in detail.

Light stabilizer

Light stabilizers mainly protect the sole material from UV damage by absorbing or reflecting UV rays. Such substances usually include ultraviolet absorbers (such as benzophenones, benzotriazoles) and light shielding agents (such as carbon black, titanium dioxide). For example, benzophenone compounds can efficiently absorb UV light and convert it into harmless heat release, thus avoiding damage to the internal structure of the material. Benzotriazoles are particularly suitable for transparent or light-colored soles due to their high transparency and low volatility. In addition, light shielding agents physically block UV rays and are suitable for application scenarios where high hiding power is required.

Antioxidants

Antioxidants prevent material aging by capturing free radicals and interrupting the oxidation chain reaction. They mainly include phenolic antioxidants, amine antioxidants and thioester antioxidants. Phenol antioxidants have become one of the commonly used varieties due to their excellent thermal stability, good compatibility and low cost. For example, bisphenol A type antioxidants can not only effectively inhibit oxidation reactions, but also improve the processing performance of materials. Although amine antioxidants have significant effects, they are usually only used in dark-colored materials due to the possibility of colored products. Thioester antioxidants are known for their efficient antioxidant ability and good hydrolysis resistance, and are suitable for sole materials in humid and hot environments.

Feature comparison table

Category Represents substance Main mechanism of action Pros Disadvantages
Light Stabilizer Benzophenone Absorbs ultraviolet rays and converts them into thermal energy Efficient and transparent May cause yellowing of the material
Benzotriazoles Absorbs ultraviolet rays, low volatility High transparency High cost
Carbon Black Physical shielding of ultraviolet rays Strong hiding power Not suitable for light-colored materials
Antioxidants Phenol antioxidants Catch free radicals and interrupt oxidation chain reaction Good thermal stability and moderate cost The effect is limited to high temperature environment
Amine antioxidants Strong antioxidant capacity Remarkable effect Colored products may be produced
Thioester antioxidants Catch peroxides to enhance hydrolysis resistance Efficient and resistant to moisture and heat May not be suitable for odor-sensitive materials

The above two types of anti-yellowing agents have their own advantages. When choosing, comprehensive consideration must be made based on the specific application scenario, material characteristics and cost budget. For example, benzotriazole light stabilizers may be the best choice for light-colored soles that require high transparency; while for dark soles that require long-term heat resistance, phenolic antioxidants are more suitable. By reasonably matching different types of anti-yellowing agents, good protective effects can be achieved while taking into account both economic and practicality.

Key Application of Anti-yellowing Agents in Sneaker Manufacturing

Anti-yellowing agents are widely used and diversified in the manufacturing of sports shoes. The core is to improve the weather resistance and anti-aging ability of sole materials through scientific proportions and precise additions, thereby extending the service life of sports shoes and maintaining their aesthetics. The following are several common application scenarios and their technical details:

1. Anti-yellowing treatment of EVA foam soles

EVA (ethylene-vinyl acetate copolymer) is the sole of the sneakerOne of the main materials is popular for its lightness, softness and good resilience. However, EVA foam is prone to yellowing when exposed to sunlight for a long time, especially in outdoor sports scenarios. To solve this problem, anti-yellowing agents are widely used in the production process of EVA soles.

Application method:

  • Selecting light stabilizers: For transparent or light-colored EVA soles, benzotriazole light stabilizers are usually used to ensure that their transparency is not affected. If it is sensitive to cost, benzophenone photostable agents can be used.
  • Combination of antioxidants: Combining phenolic antioxidants further enhances the heat resistance and anti-aging ability of EVA materials. The recommended dosage is 0.3%-0.5% to ensure good results.

Implementation steps:

  1. In the EVA raw material mixing stage, the selected anti-yellowing agent is added in proportion.
  2. Use a high-speed mixer to ensure even distribution of anti-yellowing agent.
  3. The mixed raw materials are fed into the molding equipment for foaming and cooling.
  4. The final molded sole has been tested to verify whether its anti-yellowing performance meets the expected standards.

2. Anti-yellowing optimization of PU soles

PU (polyurethane) soles are known for their high strength, wear resistance and comfort, and are often used in the midsole of professional sports shoes. However, PU materials are also prone to yellowing under light and high temperature conditions, affecting their visual effects and functionality.

Application method:

  • The function of light stabilizer: Using carbon black or titanium dioxide as light shielding agent can effectively reduce the direct irradiation of ultraviolet rays on PU materials. For transparent or translucent PU soles, transparent light stabilizers, such as benzotriazoles, are required.
  • Synergy of Antioxidants: Thioester antioxidants perform well in PU soles due to their excellent hydrolysis resistance, making them particularly suitable for sports shoes in humid environments.

Technical parameters:

parameter name Recommended value range Remarks
Light stabilizer content 0.5%-1.0% Adjust to color requirements
Antioxidant content 0.2%-0.4% Determine based on the actual usage environment
UV test time ?100 hours Simulate outdoor lighting conditions
Yellow Index ?2 Complied with international standards

3. Anti-yellowing enhancement of TPU film soles

TPU (thermoplastic polyurethane) film sole has gradually become the first choice material for high-end sports shoes due to its excellent elasticity and wear resistance. However, TPU films are highly sensitive to ultraviolet rays and oxygen, and are prone to lose their luster or even cracking due to aging.

Application method:

  • Compound anti-yellowing scheme: Use light stabilizers and antioxidants to form a double protective barrier. For example, a combination of benzotriazole light stabilizers and phenolic antioxidants can slow down the oxidation reaction while resisting ultraviolet rays.
  • Surface Coating Technology: Coat a functional coating containing anti-yellowing agent on the surface of the TPU film to further enhance its anti-aging ability.

Implementation process:

  1. Add anti-yellowing agent to the TPU raw material in proportion to ensure that it is evenly dispersed.
  2. TPU film soles are made by extrusion or injection molding.
  3. Ultraviolet accelerated aging test is performed on the finished product to evaluate its anti-yellowing properties.
  4. Adjust the anti-yellowing agent formula according to the test results to optimize the performance of the final product.

From the above application cases, it can be seen that anti-yellowing agents play an indispensable role in the manufacturing of sports shoes. Whether it is EVA, PU or TPU soles, the rational use of anti-yellowing agent can significantly improve its weather resistance and aesthetics, thereby meeting consumers’ demand for high-quality sports shoes.

The influence of anti-yellowing agent on weather resistance and aesthetics of sports shoes

Anti-yellowing agent plays a key role in improving the weather resistance and aesthetics of sports shoes. Through scientific research and technical applications, we can clearly see how these additives improve the performance of sole materials and show significant effects in actual environments.

Enhanced Weather Resistance

Weather resistance refers to the ability of a material to resist natural environments, especially against ultraviolet radiation and temperature changes. Studies have shown that EVA soles without the anti-yellowing agent will turn yellow quickly under ultraviolet irradiation, and their tensile strength and tear strength will also significantly decrease. In contrast, EVA soles containing appropriate proportions of light stabilizers and antioxidants can maintain their original color and mechanical properties even under high-intensity ultraviolet light. For example,According to some experimental data, the EVA sole with 0.5% benzotriazole light stabilizer and 0.3% phenolic antioxidant was added. After 150 hours of continuous UV aging test, the yellowing index was only 1.2, which was far lower than the 8.6 of the untreated sample. This means that anti-yellowing agents can not only delay yellowing, but also protect the physical structure of the material, thereby extending the service life of sports shoes.

Adhere to the aesthetics

Aestheticity is one of the important factors for consumers to choose sports shoes. Anti-yellowing agents have made particularly outstanding contributions in this regard. First, by controlling the color change of the sole, the anti-yellowing agent allows the sneaker to maintain the bright appearance when it was shipped out of the factory after a long period of use. Secondly, due to the presence of anti-yellowing agents, sole materials can maintain their original luster and texture in various climatic conditions, which is crucial for consumers who pursue a sense of fashion. For example, a brand has adopted a composite anti-yellowing technology in its new running shoes, that is, adding benzotriazole light stabilizers and thioester antioxidants to the TPU film soles at the same time. The results show that after one year of outdoor use, the color of the sole of this running shoe has almost no significant change, winning wide praise from the market.

Support of domestic and foreign research data

Many domestic and foreign studies have shown that the use of anti-yellowing agents can indeed significantly improve the weather resistance and aesthetics of sports shoes. For example, a study published by the American Materials Research Society (MRS) pointed out that PU soles containing anti-yellowing agents had a hardness change rate of only half of the untreated samples in aging test simulated outdoor environments, indicating that anti-yellowing agents effectively slowed down the aging process of the material. Another study conducted by the Institute of Chemistry, Chinese Academy of Sciences found that the EVA sole with a specific proportion of anti-yellowing agent was still below the industry standard limit after 300 hours of ultraviolet irradiation, proving the practical feasibility of the technology.

To sum up, the application of anti-yellowing agents in sports shoes manufacturing not only improves the product’s weather resistance, but also greatly enhances its aesthetics, allowing sports shoes to maintain excellent performance and appearance when facing complex environments. This technological advancement not only meets the high standards of consumers, but also provides strong support for the sustainable development of the sports shoe industry.

The future development trend and innovation direction of anti-yellowing agent

With the continuous advancement of technology and the changes in consumer demand, the development of anti-yellowing agents in the sole is gradually moving to a higher level. Future anti-yellowing agents need not only breakthroughs in performance, but also progress in environmental protection and versatility. The following discusses the future development direction of anti-yellowing agents from three dimensions: technological innovation, market demand and environmental protection trends.

Technical Innovation

At present, the research and development of anti-yellowing agents is developing towards more efficient and smarter directions. For example, the application of nanotechnology allows anti-yellowing agents to function more accurately at the molecular level, thereby improving their effectiveness. Nano-scale light stabilizers and antioxidants not only haveHigher dispersion and stability can also significantly reduce the amount of use, reduce costs and improve the effect. In addition, intelligent responsive anti-yellowing agents have also become a research hotspot. This type of material can automatically adjust its activity according to changes in the external environment (such as ultraviolet intensity or temperature fluctuations), thereby achieving dynamic protection. For example, some photosensitive anti-yellowing agents increase absorption in strong light and reduce consumption in low light environments, which makes them more in practical use requirements.

Market Demand

As the competition in the sports shoe market intensifies, consumers’ requirements for products are getting higher and higher. In addition to basic anti-yellowing properties, the market also expects anti-yellowing agents to be combined with other functions to provide a more comprehensive solution. For example, the development of antibacterial anti-yellowing agents is on the rise. This composite additive can not only prevent the sole from yellowing, but also effectively inhibit bacterial growth, thereby improving the interior environment and improving the wearing experience. In addition, in response to the needs of outdoor sports scenarios, waterproof, anti-fouling and anti-yellowing agents have gradually attracted attention. This type of product can help the soles stay clean and dry in bad weather while extending their service life.

Environmental Trends

On a global scale, the improvement of environmental awareness has prompted the chemical industry to transform toward green. For anti-yellowing agents, this means the need to develop more materials based on renewable resources and reduce potential harm to the environment. Bio-based anti-yellowing agents are an important research direction. For example, natural antioxidants produced by plant extracts or microbial fermentation have good anti-yellowing effects without posing a burden to the ecosystem. In addition, non-toxic and harmless anti-yellowing agents are also an important trend in future development. Researchers are exploring how to develop products that fully meet ecological standards through molecular design and synthesis process optimization to meet increasingly stringent regulatory requirements.

Summary of future prospects

To sum up, the future of anti-yellowing agents in the sole will revolve around technological innovation, market demand and environmental protection trends. The application of nanotechnology, the development of multifunctional composite additives, and the promotion of green materials will all become important driving forces to promote the development of the industry. These advances can not only meet consumers’ demand for high-performance sports shoes, but will also bring broader market opportunities and sustainable development possibilities to the entire shoemaking industry.

Conclusion: The value and future prospects of anti-yellowing agents in the sole

The importance of anti-yellowing agent in soles cannot be ignored as one of the core technologies in sports shoes manufacturing. Through detailed discussion in this article, we learned that anti-yellowing agents can not only effectively delay the aging and yellowing of sole materials, but also significantly improve the weather resistance and aesthetics of sports shoes, thereby meeting consumers’ demand for high-quality products. From light stabilizers to antioxidants, each type has its own unique mechanism of action and applicable scenarios, which together form an indispensable part of modern sports shoes manufacturing.

Looking forward, with the continuous advancement of technology and the increasing diversification of consumer needs,Yellowing agents will continue to make breakthroughs in technological innovation, versatility and environmental performance. Whether it is improving efficiency through nanotechnology, developing composite functions such as antibacterial and waterproofing, or using bio-based materials to achieve green production, anti-yellowing agents will play an increasingly important role in the sports shoe industry. It can be said that this seemingly ordinary technology actually carries great potential to drive the entire industry forward.

Therefore, whether it is a manufacturer, designer or ordinary consumer, it should pay enough attention to anti-yellowing agents in the sole. Only by deeply understanding its principles and applications can we better use this technology and create more durable, more beautiful and environmentally friendly sports shoe products, bringing more convenience and fun to people’s lives.

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