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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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How to use anti-yellowing agents in the sole to effectively improve the durability of outdoor shoes and prevent color changes

3月 16th, 2025 News

Anti-yellowing agent for soles: a secret weapon for outdoor shoes’ durability

1. Introduction: Why do shoes “change their faces”?

Have you ever encountered such an embarrassing scene? I just bought a brand new pair of white sneakers and wore them to the park for a walk, but when I came back I found that the soles had quietly turned yellow. What’s worse is that this color change is irreversible. No matter how much detergent or brush you use, it cannot restore it to its original whiteness and flawlessness. It’s like a friend who was originally energetic suddenly became dirty, making people want to ask: “What the hell happened?” In fact, this phenomenon has a professional name in the industry – the yellow soles of the shoe.

Yellowing soles is a common chemical reaction that usually occurs on soles made of rubber or plastic. Its culprit is the interaction between a series of complex environmental factors and material properties, such as ultraviolet radiation, high temperature oxidation, moisture invasion, etc. Especially for outdoor shoes that are often exposed to the sun, yellowing is almost an inevitable problem. Imagine that a pair of beautifully designed hiking shoes turned into “little yellow boots” due to long-term exposure to the sun. Isn’t it a bit ridiculous to cry?

However, with the advancement of technology, we finally have an effective means to fight this problem – anti-yellowing agent for soles. This magical chemical additive is like putting an invisible protective clothing on the soles of the shoe, which can effectively delay or even prevent the occurrence of yellowing. This article will explore in-depth the mechanism of action, application methods of anti-yellowing agents in the sole and how to improve the durability of outdoor shoes through it. At the same time, it will also combine relevant domestic and foreign literature to unveil the mystery of this field for you. If you are a shoe designer, manufacturer, or someone who simply likes to wear white shoes, this article will definitely benefit you a lot!

2. The “culprit” of yellowing soles: analyze the reasons from a scientific perspective

To understand the importance of anti-yellowing agents in the sole, we first need to figure out why the sole changes yellow. This is not a simple question, because it involves a series of complex chemical reactions and physical processes. Let’s go into the laboratory together and see who these “masters” are.

(I) UV rays: the culprit for “tanning” the soles

Ultraviolet rays (UV) are one of the main causes of yellowing of the sole. When rubber or plastic soles are exposed to sunlight, UV light can destroy its molecular structure, triggering a series of photochemical reactions. Specifically, ultraviolet rays can decompose certain organic components in the sole material, creating free radicals, which in turn leads to the degradation and discoloration of the material. This phenomenon is similar to the fact that fruits will gradually turn brown when exposed to the air after being cut, except that the “face change” speed of the soles of the shoe is much slower.

  • Metaphor: You can think of UV rays as a naughty kid who always likes to hold a magnifying glass to face your soles.”Bake. Although it may not be a big deal at the beginning, over time, the soles will be “baked” beyond recognition.

(II) Oxygen: a catalyst for “rusting” soles

In addition to ultraviolet rays, oxygen is also another important cause of yellowing. When the sole comes into contact with air, the unsaturated bonds in it will undergo an oxidation reaction, forming carbonyl compounds or other colored substances. The accumulation of these substances will gradually make the sole appear yellow or brown. Especially in high temperature environments, the oxidation reaction speed will be significantly accelerated, making the sole more likely to turn yellow.

  • Metaphor: If the sole is compared to a piece of metal, then oxygen is the bad guy who makes the metal rust. While the sole won’t really rust like iron, it does lose its original luster due to oxidation.

(III) Moisture and pollutants: Accomplices who accelerate yellowing

In addition to ultraviolet rays and oxygen, moisture and pollutants can also contribute to the yellowing of the sole. For example, moisture in a humid environment will penetrate into the sole material, causing more chemical reactions to occur; while pollutants such as dust and soil may be adsorbed on the sole surface, further aggravating the color changes.

  • Metaphor: Imagine that your sole is like a sponge, and every time you step into mud and water, you will absorb some impurities. These impurities not only make the soles look dirty, but may also become a catalyst for yellowing.

(IV) Quality issues of the material itself

Of course, in addition to the influence of the external environment, the characteristics of the sole material itself will also affect its anti-yellowing ability. For example, soles made of inferior rubber or undertreated plastics are often more likely to have yellowing problems. This is because these materials may contain more unstable components and are easily disturbed by external factors.

  • Metaphor: It’s like applying a wall with inferior paint. It may be beautiful at first, but it will peel and fade quickly. Similarly, low-quality sole materials cannot stand the test of time.

From the above analysis, it can be seen that yellowing of the sole is the result of a joint action of multiple factors. To completely solve this problem, we must find a solution that can fully resist these “culprits”. And this is the core value of anti-yellowing agent in the sole.

3. Anti-yellowing agent for soles: Principles and classification

Since we know the reasons for the yellowing of the sole, let’s learn how to use anti-yellowing agents to deal with these problems. Sole anti-yellowing agent is a special chemical additive. Its main function is to protect the sole material from yellowing by inhibiting or slowing down the various chemical reactions mentioned above. Next we willA detailed introduction to the working principle of anti-yellowing agent and its main classification.

(I) Working principle: Create a “golden bell cover” for the sole

The effects of anti-yellowing agents in the sole can be summarized into the following aspects:

  1. Absorb UV rays
    Anti-yellowing agents contain ingredients that can absorb ultraviolet rays, which will block UV light like an invisible umbrella to prevent it from causing damage to the sole material. This mechanism is similar to the protective effect of sunscreen on human skin.

  2. Catch free radicals
    Free radicals produced during oxidation are one of the key factors that lead to yellowing. Anti-yellowing agents can delay material aging and discoloration by capturing these free radicals, interrupting the chain reaction they trigger.

  3. Stable molecular structure
    Anti-yellowing agents can also enhance the molecular stability of sole materials, reduce the number of unsaturated bonds, and reduce their sensitivity to oxygen and other chemicals. It’s like putting a bulletproof vest on the sole to make it more sturdy and durable.

  4. Waterproof and stain-proof
    Some anti-yellowing agents also have certain waterproof and anti-fouling properties, which can reduce the impact of moisture and pollutants on the sole and further extend its service life.

(II) Category: Different needs correspond to different products

Depending on the purpose and effect, anti-yellowing agents in the sole can be divided into the following categories:

Type Features Scope of application
Light Stabilizer Mainly used to absorb ultraviolet rays and prevent photochemical reactions Commonly found in outdoor sports shoes, beach shoes, and other products that require long-term exposure to the sun
Antioxidants Focus on capturing free radicals and inhibiting oxidation reactions Widely used in various types of rubber and plastic soles
Thermal stabilizer Improve the heat resistance of the material and reduce discoloration caused by high temperature Shoes suitable for industrial shoes in high temperature environments or for special occasions
Comprehensive Anti-yellowing Agent It has multiple functions at the same time, and the overall effect is better Suitable for high-end brand footwear productsProduct

(III) Example of typical product parameters

The following are the specific parameters of several common sole anti-yellowing agents for reference:

name Ingredients Add ratio (wt%) Yellow-resistance grade Application Fields
UV-987 Trumped amine light stabilizers 0.5~1.0 Class A Outdoor sports shoes, hiking shoes
AO-200 Stealed phenolic antioxidants 0.3~0.8 Class B Daily casual shoes, children’s shoes
TS-600 Thermal stabilizer 0.2~0.5 Class C Industrial protective shoes, military shoes

It should be noted that different types of anti-yellowing agents may have cross-applications, and the specific choices should be adjusted according to actual needs and budget.

IV. Application methods of anti-yellowing agent for soles

After understanding the principles and classification of anti-yellowing agents, let’s talk about how to correctly apply them to sole production. This step is crucial because it directly determines the quality of the anti-yellowing effect.

(I) Mixing process: Even distribution is the key

Anti-yellowing agents are usually added to the sole material in powder or liquid form. In order to ensure that its effect is maximized, it is necessary to ensure the uniform distribution of the anti-yellowing agent in the material. Here are some common mixing process points:

  1. Premix phase
    Before mixing the raw materials, the anti-yellowing agent is fully stirred with part of the base material to form a premix. This can avoid the problem of excessive local concentration during subsequent processing.

  2. Temperature Control
    Pay attention to temperature control during mixing. Too high or too low temperatures may affect the effect of the anti-yellowing agent. Generally speaking, the optimal mixing temperature should be between 60 and 80°C.

  3. Time Management
    mixThe time should not be too short, otherwise the anti-yellowing agent may not be completely dispersed; but it should not be too long to avoid damaging the performance of the material itself.

(II) Forming process: Details determine success or failure

The molding process of the sole will also affect the effect of the anti-yellowing agent. Here are some things to note:

  1. Mold Cleaning
    Before injection molding or pressing, be sure to ensure that the mold is clean and without residue, otherwise it may affect the uniform distribution of the anti-yellowing agent.

  2. Cooling rate
    The cooling process after molding also needs to be strictly controlled. The cooling rate that is too fast or too slow may cause stress concentration, thereby weakening the effect of the anti-yellowing agent.

  3. Post-processing
    For certain special types of soles, additional post-treatment steps are required, such as spraying protective layers or surface polishing, to further enhance the anti-yellowing effect.

5. Domestic and foreign research progress: new breakthroughs in anti-yellowing technology

With the development of science and technology, new progress has been made in the research on anti-yellowing agents in the soles. Below, we will compare relevant domestic and foreign literature to see what innovative achievements are worth paying attention to in this field.

(I) Foreign research trends

In recent years, European and American countries have made many breakthroughs in the research and development of anti-yellowing agents for soles. For example, a US scientific research team has developed a new nano-scale light stabilizer. This product not only has excellent ultraviolet absorption capacity, but also can significantly improve the wear resistance and flexibility of sole materials. In addition, German scientists proposed an anti-yellowing solution based on biodegradable materials, which is both environmentally friendly and efficient, and has attracted widespread attention from the industry.

(II) Current status of domestic research

in the country, research on anti-yellowing agents for soles is also in full swing. A study from Tsinghua University shows that by optimizing the molecular structure of anti-yellowing agents, its stability under complex environmental conditions can be greatly improved. At the same time, South China University of Technology has successfully developed a multifunctional composite anti-yellowing agent that can achieve various functions such as light stability, antioxidant and waterproofing in a single formula.

(III) Future development trends

Looking forward, the development trend of anti-yellowing agents in soles mainly includes the following directions:

  1. Green and environmentally friendly
    As consumers’ environmental awareness increases, it will become an inevitable trend to develop more anti-yellowing agents based on natural raw materials or renewable resources.

  2. Intelligent
    Combining IoT technology and smart sensing devices, future anti-yellowing agents may have the ability to monitor and repair real-time, further improving the durability of the sole.

  3. Customization
    Providing personalized anti-yellowing solutions according to the needs of different users will be an important reflection of market competitiveness.

VI. Summary and Outlook: Keep every pair of shoes brilliant

Through the introduction of this article, we can see that anti-yellowing agents in the sole are not only an effective tool to solve the problem of yellowing of the sole, but also an important means to improve the durability and quality of outdoor shoes. Whether from the perspective of scientific principles or practical application, anti-yellowing agents have shown great potential and value.

Of course, there is still a lot of room to explore in this field. For example, how to further reduce costs, improve efficiency, and how to better meet personalized needs, we need to constantly explore and improve in practice. I believe that with the continuous advancement of technology, the anti-yellowing agent of the sole in the future will become more advanced and smarter, bringing more convenience and surprises to our lives.

After, I borrowed a famous saying to end this article: “Details determine success or failure.” The anti-yellow change of the sole seems to be just a small detail, but it directly affects the appearance and service life of the entire pair of shoes. Only by carefully doing every detail can we create truly satisfactory products. I hope every reader can get inspiration from it and jointly promote the development of this industry!

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