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Discussion on the importance of anti-yellowing agents in children’s shoes manufacturing to ensure the healthy growth of children

3月 16th, 2025 News

A discussion on the importance of anti-yellowing agents in children’s shoes manufacturing

Introduction: Start with the child’s feet and focus on healthy growth

The growth process of a child is like a seedling breaking out of the ground, gradually thriving under the nourishment of sunshine, rain and dew. However, as parents and guardians, have we noticed that the shoes children wear every day also play a crucial role in their health? A pair of qualified children’s shoes is not only a tool for walking, but also an important “company” for children’s foot development. Among them, the quality of the sole is particularly important. The sole is not only a key part of supporting the child’s every step, but also directly affects the comfort, durability and safety of the shoes.

In the modern shoemaking industry, the selection and processing of sole materials have become one of the core links that determine the quality of shoes. Especially for children’s shoes, due to the active and active personality of children, the soles need to have higher wear resistance, flexibility and anti-aging abilities. However, with the passage of time and the influence of environmental factors, many soles will turn yellow – the originally white or transparent soles gradually become dull and yellow, which not only affects the beauty, but also may release harmful substances and threaten the health of children. Therefore, how to effectively prevent sole yellow has become an important topic in the field of children’s shoe manufacturing.

It is in this context that anti-yellowing agents in the sole emerged. As a functional additive, anti-yellowing agents can significantly delay or even completely avoid color changes caused by ultraviolet irradiation, high temperature oxidation or other external factors of the sole material. Its appearance not only improves the overall quality of children’s shoes, but also provides children with a safer and healthier wearing experience. This article will conduct in-depth discussions on the mechanism of action, product parameters, application status and future development direction of anti-yellowing agents in the sole, and combine relevant domestic and foreign literature and actual cases to comprehensively analyze its important significance in ensuring the healthy growth of children.

The basic concept and mechanism of action of anti-yellowing agent in soles

What is anti-yellowing agent for soles?

Sole anti-yellowing agent is a functional chemical additive specially used to prevent yellowing of sole materials. It maintains the original appearance and performance of the sole by inhibiting or slowing down the color changes generated by the sole material during light, thermal energy or chemical reactions. Simply put, anti-yellowing agent is like the “sunscreen” for the sole, which puts a layer of protective clothing on the sole material to prevent it from erosion by the external environment.

The main reason for yellowing of the sole is that certain components in the material (such as plasticizers, antioxidants or dyes) undergo chemical reactions when they are exposed to ultraviolet radiation, oxygen contact or high temperatures, resulting in yellow or brown compounds. These compounds will be deposited on the sole surface, causing the sole to gradually darken and eventually lose its original luster and beauty. Anti-yellowing agents prevent this chemical reaction from occurring by capturing free radicals, absorbing ultraviolet rays or stabilizing molecular structures, thereby achieving an anti-yellowing effect.

Mechanism of action of anti-yellowing agent

The mechanism of action of anti-yellowing agents can be divided into the following types:

  1. Free Radical Capture
    Many sole materials (such as TPU, EVA, etc.) produce free radicals during the aging process, which are the key factors in causing yellowing. Anti-yellowing agents can reduce the possibility of yellowing by capturing free radicals and interrupting the chain reaction. This process is similar to wearing a “gas mask” on the sole material, so that they are no longer easily harmed by outsiders.

  2. Ultraviolet absorption
    Ultraviolet rays are one of the important external factors that cause yellowing of the sole. The UV absorber in the anti-yellowing agent can effectively absorb UV energy and convert it into harmless heat to dissipate it, thereby avoiding the damage of UV rays to the sole material. This is like installing a “sunshade” on the soles of the shoe to block the invasion of ultraviolet rays.

  3. Molecular structure stabilization
    Certain anti-yellowing agents can also enhance their stability by changing the molecular structure of sole materials and reduce the probability of chemical reactions caused by environmental factors. For example, by forming a stable conjugate system, the anti-yellowing agent can reduce the number of unstable bonds in the material, thereby extending the service life of the sole.

  4. Antioxidant function
    Anti-yellowing agents usually have certain antioxidant properties, which can delay the aging of sole materials due to oxidation. This antioxidant function not only prevents yellowing, but also improves the durability and elasticity of the sole.

Classification of Anti-Yeling Agents

Depending on the principle of action and application scenarios, anti-yellowing agents can be divided into the following categories:

Category Features Common Applications
Light Stabilizer Absorb UV rays to prevent photoaging EVA sole, TPU sole
Free Radical Capture Interrupt the free radical chain reaction Polyurethane soles, rubber soles
Antioxidants Slow down the oxidation reaction rate TPR soles, PU soles
Compound anti-yellowing agent Comprehensive multiple functions, effectBetter fruit High-end sports shoes, children’s shoes

It can be seen from the above classification that different types of anti-yellowing agents are suitable for different sole materials and usage scenarios. Choosing a suitable anti-yellowing agent can not only improve the anti-yellowing performance of the sole, but also take into account other functional needs.

Product Parameter Analysis of Sole Anti-Yellowing Agent

In order to better understand the actual application effect of anti-yellowing agent in the sole, we need to conduct a detailed analysis of its main product parameters. The following are several key parameters and their meanings:

parameter name Unit Description Reference value range
Additional amount % The ratio of the addition of anti-yellowing agent to sole material 0.5%-2%
Temperature resistance °C Stability of anti-yellowing agents at high temperatures ?120°C
Photostability – Absorption capacity of ultraviolet rays ?90%
Antioxidation efficiency % The degree of inhibition of oxidation reaction ?85%
Compatibility – Compatibility with sole material Excellent
Yellow Index – The degree of yellowing of the material under test conditions ?3

Take a composite anti-yellowing agent widely used in children’s shoes as an example, the specific parameters are as follows:

parameter name Test conditions Actual measured value
Additional amount Standard Formula 1.2%
Temperature resistance 150°C, 24 hours No obvious decomposition
Photostability UV lamp irradiation for 72 hours Yellow change index ?1
Antioxidation efficiency Accelerating aging test 92%
Compatibility TPU/EVA mixture Full compatible
Yellow Index Storage under natural conditions for 6 months ?2

From the above data, it can be seen that this anti-yellowing agent has excellent performance under various test conditions, which can effectively meet the needs of children’s shoes for anti-yellowing soles.

Status and Application Examples of Domestic and Foreign Research

Domestic research status

In recent years, with the rapid development of my country’s shoemaking industry, the research and application of anti-yellowing agents for shoe soles has also made significant progress. According to a paper published in 2021 by China Plastics, a domestic scientific research team found through the modification of TPU sole materials that after adding an appropriate amount of composite anti-yellowing agent, the yellowing index of the sole can be reduced to 1/3 of the original, and its weather resistance and wear resistance have also been significantly improved.

In addition, some companies are also actively promoting technological innovation in anti-yellowing agents. For example, a well-known shoemaking company has developed a new light stabilizer. This product has a significant application effect in EVA soles, which not only greatly reduces the risk of yellowing, but also extends the service life of the soles.

Current status of foreign research

Foreign research in the field of anti-yellowing agents for soles started early and the technology was relatively mature. The “Zerust” series of anti-yellowing agents launched by DuPont in the United States are well-known for their efficient light stability and antioxidant properties, and are widely used in high-end sports shoes and children’s shoes. BASF, Germany, has developed an anti-yellowing agent based on nanotechnology. Its molecular size is small, has good dispersion, and can be evenly distributed in the sole material, thereby achieving better anti-yellowing effect.

It is worth mentioning that Japan’s research on anti-yellowing technology for children’s shoes is particularly outstanding. According to a report in 2020 by the journal “Polymer Science and Engineering”, a Japanese research institution has developed an environmentally friendly anti-yellowing agent. The product not only has superior performance, but also meets strict environmental standards and is very popular in the market.

Application Example

Case 1: A certain brand of children’s sports shoes

A internationally renowned brand uses a composite anti-yellowing agent in its children’s sneakers. After long-term use tests, the soles of this product remained well even under high intensity light and frequent use.The appearance and performance are as high as 98%.

Case 2: Domestic children’s casual shoes

A well-known domestic children’s shoe brand has introduced an independently developed anti-yellowing agent to its new casual shoes. Through comparative experiments, it was found that after the soles with anti-yellowing agent were stored under natural conditions for one year, the yellowing index was only 1/4 of the unadded group, which fully proved the effectiveness of the anti-yellowing agent.

The effect of anti-yellowing agents on children’s health

Why should children’s shoes pay special attention to anti-yellowing?

Children are in the stage of rapid growth and development, their immune system is not yet fully mature, and they are more sensitive to changes in the external environment. If the sole material turns yellow, some harmful substances, such as volatile organic compounds (VOCs), may be released. Once inhaled or exposed by children, these substances may cause damage to their respiratory system, skin health, and even their nervous system.

In addition, the soles after yellowing often suffer from decline in mechanical properties, such as weakening elasticity and increasing hardness. These problems can lead to reduced comfort in the shoes and increase the risk of injury during walking. Therefore, choosing children’s shoes containing high-efficiency anti-yellowing agents can not only extend the service life of the shoes, but also provide multiple guarantees for children’s health.

How can anti-yellowing agents help children grow up healthily?

  1. Reduce the release of hazardous substances
    Anti-yellowing agents reduce the generation and release of harmful substances in sole materials by inhibiting the occurrence of chemical reactions, thereby reducing the potential threat to children’s health.

  2. Keep the sole performance stable
    The soles containing anti-yellowing agent can maintain good elasticity and flexibility after long-term use, providing more comfortable support for children’s foot development.

  3. Enhance the durability of shoes
    The addition of anti-yellowing agent makes the sole more resistant to aging, reducing frequent replacements caused by material deterioration, which not only saves resources but also reduces the burden on the family.

  4. Enhance psychological pleasure
    A pair of shoes that always keep as white as new will not only make children look cleaner, but also make them feel confident and enjoy more fun in their daily lives.

Looking forward: Development trend of anti-yellowing agents

With the advancement of technology and the continuous improvement of consumer demand, the research and development direction of anti-yellowing agents in the sole is also constantly expanding. In the future, the development of anti-yellowing agents will show the following trends:

  1. Green and environmentally friendly
    As global awareness of environmental protection increases, more and more companies are beginning to focus on developing environmentally friendly anti-yellowing agents. This type of product not only has superior performance, but also has a low-carbon and environmentally friendly production process, which is in line with the concept of sustainable development.

  2. Multifunctional
    The next generation of anti-yellowing agents will no longer be limited to a single anti-yellowing function, but will integrate antibacterial, anti-mold, waterproof and other functions to provide all-round protection for children’s shoes.

  3. Intelligent
    With the help of nanotechnology and the development of smart materials, future anti-yellowing agents are expected to achieve self-healing function, that is, when the sole material is slightly damaged, the anti-yellowing agent can automatically repair the damaged parts and extend the service life of the sole.

  4. Personalized Customization
    With the popularization of 3D printing technology, the sole materials of children’s shoes in the future may be customized according to the specific needs of each child, and anti-yellowing agents will also become an indispensable part of this process.

Conclusion: Escort every step of your child

Although the anti-yellowing agent seems inconspicuous, it plays a crucial role in the manufacture of children’s shoes. From preventing yellowing to ensuring health, from improving performance to extending life span, anti-yellowing agents provide solid support for children’s healthy growth. As the old saying goes, “A journey of a thousand miles begins with a single step.” Let us start with the feet of our children and carefully select every pair of high-quality children’s shoes to lay a solid foundation for their life journey!

I hope this article can help you better understand the importance of anti-yellowing agents in the sole and make more wise choices when purchasing children’s shoes in the future. After all, parents can truly feel at ease only if they let their children dress with peace of mind!

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Detailed explanation of the application techniques of anti-yellowing agent in the sole to help effectively prevent various shoes from yellowing

3月 16th, 2025 News

Detailed explanation of the application skills of anti-yellowing agent in the sole

Preface: Why do shoes turn yellow?

In daily life, we often find that our beloved shoes gradually turn yellow over time. Whether it is white sneakers, sports shoes or casual shoes, this phenomenon not only affects the beauty, but also can make people feel embarrassed. So, why does this happen? In fact, there are many reasons for yellowing of shoes, which can be mainly attributed to the following categories:

Material Aging

Sole materials (such as rubber, TPU, etc.) will undergo oxidation reactions when exposed to air for a long time, resulting in yellowing of the color. Especially with white or light-colored soles, this change is more obvious. This is like the color discoloration after being exposed to the air after being cut, which is the result of the natural aging of the material.

Lighting

Ultraviolet rays in the sun have a strong destructive effect on the sole material. Long-term sun exposure will cause chemical composition in the sole to change, causing color changes. This also explains why shoes placed on the balcony are more likely to turn yellow.

Contaminant Attachment

Pollutants in the environment, such as sulfur dioxide, nitrogen oxides, etc. in the air, may also react chemically with the sole material, causing them to discolor. In addition, the sole will inevitably be contaminated with dust, oil, etc. during use. If these substances are not cleaned in time, it will accelerate the yellowing process of the sole.

Improper storage

Incorrect storage method is also one of the important reasons why shoes turn yellow. For example, storing shoes in humid, high temperatures or poorly ventilated places will promote the occurrence of chemical reactions, thereby accelerating changes in the color of the sole.

To effectively prevent these problems, we need to understand and apply anti-yellowing agents in the sole properly. Next, we will discuss in detail how to select and use anti-yellowing agents and their specific mechanism of action.

Principle of action of anti-yellowing agent

Anti-yellowing agent is a chemical specifically designed to delay or prevent material from turning yellowing. Its main function is to protect the material from external factors through a series of complex chemical reactions, thereby maintaining its original color and performance. The following are the main mechanisms for the anti-yellowing agent to work:

Free Radical Capture

One of the common ingredients in anti-yellowing agents is antioxidants, which can effectively capture and neutralize free radicals. Free radicals are highly active molecules triggered by factors such as light, heat, and oxygen. They attack polymer chains in the material, resulting in degradation and discoloration. Antioxidants stabilize these free radicals by providing electrons, thus preventing their further reactions and protecting the material from damage.

Absorb UV rays

Another important anti-yellowing agent ingredient is the UV absorber. Instead of letting UV light go straight, these compounds absorb energy and convert it into harmless heat.Connect to the material. This greatly reduces the destructive effect of ultraviolet rays on the material and extends the service life of the material.

Chemical Stabilization

In addition to the two main mechanisms mentioned above, certain anti-yellowing agents can also enhance the stability of the material by forming stable chemical bonds. For example, some metal ion complexes can bind to unstable groups in the material to form a more stable structure, thereby reducing the possibility of yellowing.

Synergy effects in practical applications

In practical applications, multiple anti-yellowing agents are often required to work together to achieve the best results. This is because different anti-yellowing agents have their own advantages for different yellowing reasons. For example, antioxidants are good at dealing with oxidation reactions caused by oxygen, while UV absorbers focus on resisting the harms of UV. Therefore, when formulating anti-yellowing agents, the appropriate combination is usually selected according to the specific needs to ensure all-round protection.

Through the above mechanism, anti-yellowing agents can not only effectively prevent the sole from turning yellow, but also improve the overall durability and appearance quality of the sole material. Next, we will further explore how to choose the appropriate anti-yellowing agent product according to the specific situation.

Guidelines for Choosing Anti-Yellowing Agents

Choose the right anti-yellowing agent to prevent the sole from turning yellow. There are many types of anti-yellowing agents on the market, each with its specific application scenarios and advantages. The following are several common types and their characteristics:

1. Antioxidant anti-yellowing agent

  • Advantages: Efficiently capture free radicals and significantly slow down the oxidation process.
  • Scope of application: Suitable for rubber and plastic products that are susceptible to oxygen.
  • Recommended product parameters:
    • Ingredients: Phenol antioxidants
    • Doing: 0.5%-1% (relative to total material weight)
    • Temperature stability: up to 200°C
Ingredients Pros Disadvantages
Phenol antioxidants Efficient and stable May affect material hardness
Phosphate Lower volatility High cost

2. UV absorbing anti-yellowing agent

  • Advantages: Effectively block ultraviolet rays and protect the material from light damage.
  • Scope of application: Especially suitable for outdoor products that are frequently exposed to the sun.
  • Recommended product parameters:
    • Ingredients: benzotriazoles
    • Doing: 0.3%-0.8%
    • Light Stability: Strong
Ingredients Pros Disadvantages
Benzotriazoles Strong UV absorption capacity May cause slight blueness
Benzophenone Broad Spectrum Absorption Easy to migrate

3. Complex anti-yellowing agent

  • Advantages: Combined with a variety of anti-yellowing mechanisms, provide comprehensive protection.
  • Scope of application: Widely used in various sole materials, especially high-performance sports shoes.
  • Recommended product parameters:
    • Ingredients: Mixed phenols and UV absorbers
    • Doing: 0.8%-1.5%
    • Comprehensive Performance: Excellent
Ingredients Pros Disadvantages
Mixed Comprehensive Protection Modeling cost is high
Single type Cost-effective Limited protection scope

When choosing anti-yellowing agent, the specific properties of the sole material, use environment and life expectancy should be considered. For example, for shoes used indoors, a more economical antioxidant anti-yellowing agent can be selected; for outdoor sports shoes, it is more suitable to use composite anti-yellowing agents for more comprehensive protection. At the same time, pay attention to following the manufacturer’s recommended dosage and usage method to ensure good results.

Application steps for anti-yellowing agent

To make the anti-yellowing agent fully exert its efficacy, correct application steps are indispensable. Here are a series of detailed step-by-step instructions to help you effectively use anti-yellowing agents during production:

Step 1: Preparation phase

Before starting any processing, make sure all equipment and tools are clean and ready. This includes agitators, metering tools and storage containers. The quality of preparation directly affects the effectiveness of subsequent steps.

Step 2: Accurate measurement

The required dose is accurately calculated based on the product parameters of the selected anti-yellowing agent. This is a very critical link, because too much or too little will affect the performance of the final product. For example, if a benzotriazole-based ultraviolet absorber is used, the recommended amount is usually between 0.3% and 0.8% of the total material amount.

Step 3: Mix evenly

Adhesive anti-yellowing agent is added to the base material and mixed thoroughly using appropriate stirring equipment. This process requires special attention to time control and stirring speed to ensure that the anti-yellowing agent can be evenly distributed throughout the material system. If the mixture is uneven, it may lead to insufficient local protection, which will affect the overall effect.

Step 4: Forming and processing

After the mixing is completed, the sole is molded according to the conventional process. At this stage, maintaining stable temperature and pressure conditions is essential to maintain the effectiveness of the anti-yellowing agent. Both high or too low temperatures may cause the anti-yellowing agent to fail or decompose.

Step 5: Quality Inspection

The next step is to conduct strict quality inspection of the finished product. Inspection items include but are not limited to color consistency, surface gloss, and anti-aging properties. Only when all indicators meet the standards can this batch of products be considered to have successfully achieved the goal of anti-yellowing.

Through the above five steps, you can ensure that the anti-yellowing agent is correctly and effectively applied in the sole manufacturing process, thereby greatly reducing the risk of sole yellowing and improving product quality and market competitiveness.

Application Examples and Effective Evaluation

In order to better understand the practical application effect of anti-yellowing agents, we selected several typical sole materials as experimental subjects, added different types of anti-yellowing agents, and conducted a six-month aging test. The following are the specific experimental settings and results analysis:

Experimental Design

  • Material type: natural rubber, TPU, EVA foam
  • Anti-yellowing agent types:
    • Antioxidant type: phenolic antioxidants
    • UV absorption type: benzotriazoles
    • Compound type: mixed phenols and UV absorbers
  • Test conditions: Store for six months under simulated natural light and room temperature

Result comparison

Natural Rubber

Anti-yellowing agent type Yellow change index change Surface Condition
None +45% Obvious yellowing
Phenols +15% Slight color change
Benzotriazoles +10% Almost unchanged
Mixed +5% No color change

TPU

Anti-yellowing agent type Yellow change index change Surface Condition
None +38% Yellowing
Phenols +12% Slightly yellow
Benzotriazoles +8% basically unchanged
Mixed +3% No change

EVA Foam

Anti-yellowing agent type Yellow change index change Surface Condition
None +50% Severe discoloration
Phenols +20% Moderate color discoloration
Benzotriazoles +15% Minor discoloration
Mixed +7% Almost unchanged

From the above data, it can be seen that no matter which material, without adding anti-yellowing agent, the yellowing index has increased significantly after six months of aging test, indicating that the material has undergone significant discoloration. After adding anti-yellowing agent, the situation has improved greatly, especially the composite anti-yellowing agent has shown excellent anti-yellowing effect, which almost completely inhibits the color change of the material.

In addition, it is worth noting that although a single type of anti-yellowing agent can also play a certain protective role, its effect is generally not as good as that of composite products. This shows that in practical applications, solutions combined with multiple anti-yellowing mechanisms can often provide more comprehensive and lasting protection.

Through these experimental results, we can conclude that rational selection and correct use of anti-yellowing agents can indeed effectively prevent the yellowing problem of sole materials and significantly improve the appearance quality and service life of the product.

Future development trends of anti-yellowing agents

With the advancement of technology and the continuous changes in consumer demand, the anti-yellowing agent field is also experiencing rapid development and innovation. Future anti-yellowing agents are expected to move in the following directions:

Higher efficiency and lower cost

Scientific researchers are working hard to develop new anti-yellowing agents that can achieve higher protective effects at lower usage, thereby helping companies reduce costs and improve economic benefits. For example, the new generation of nano-scale anti-yellowing agents can penetrate deeper into the material due to their extremely small particle size, providing more comprehensive protection.

Environmental and Sustainability

With global awareness of environmental protection, green chemistry has become the focus of research and development. Future anti-yellowing agents will use more renewable resources as raw materials and reduce or eliminate the production of harmful by-products. This not only helps protect the ecological environment, but also conforms to the modern society’s pursuit of sustainable development.

Intelligent Responsive Materials

Smart materials are a popular research field in materials science. Future anti-yellowing agents may have intelligent response characteristics, that is, they can automatically adjust their protective functions according to changes in the external environment. For example, when an increase in UV intensity is detected, the anti-yellowing agent automatically enhances its absorption capacity, thus providing greater protection.

Verious Integration

To meet diverse needs, the futureAnti-yellowing agents will also develop in the direction of versatility. This means that a product can not only prevent yellowing, but also provide various additional functions such as antibacterial, anti-mold, and enhance wear resistance, thereby simplifying the production process and increasing the added value of the product.

Through these technological innovations, the future anti-yellowing agent will be more efficient, environmentally friendly and versatile, bringing revolutionary changes to the sole materials and the entire shoemaking industry. This will not only help improve product quality, but will also promote sustainable development throughout the industry.

Conclusion: Entering a new era without yellowing

To sum up, the application of anti-yellowing agents in the sole plays a crucial role in maintaining the appearance of the shoe and extending its service life. From understanding the basic principles of yellowing, to mastering the selection and use of anti-yellowing agents, to looking forward to its future development trends, we have fully explored all aspects of this field.

In actual operation, selecting a suitable anti-yellowing agent and applying it strictly in accordance with the specifications can significantly reduce the problem of yellowing of the sole. This is a win-win choice for both manufacturers and consumers. For manufacturers, this means higher product quality and better market reputation; for consumers, it means longer service life and a more satisfying shopping experience.

With the continuous advancement of technology, the functions of anti-yellowing agents will become more and more powerful and their application range will be more extensive. We look forward to the arrival of this day, when all shoes can maintain their original beauty and no longer fade as time passes. Let us move towards this new era without yellow change together!

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Application and effect analysis of anti-yellowing agent on work shoes to enhance the performance of working shoes

3月 16th, 2025 News

Analysis of the application and effect of anti-yellowing agent on work shoes

1. Introduction: Why do we need to resist yellowing?

If you are a worker who has been wearing work shoes for a long time, you may find a frustrating phenomenon: the originally white or light-colored soles gradually become “yellow-faced women” after a period of use. This phenomenon not only affects the appearance of the shoes, but also may make people doubt the quality of the product. In fact, this phenomenon is called “yellow change” because some components in the sole material undergo chemical reactions under light, high temperature or oxidation, resulting in color changes.

So, how to solve this problem? The answer is – Anti-yellowing agent of soles! It is like an invisible guardian, silently protecting your work shoes and keeping them new. This article will explore in-depth the application and effect of anti-yellowing agents in tool shoes, and at the same time, combining relevant domestic and foreign literature and experimental data to unveil the veil of this magical material for you.

2. Analysis of the causes of yellowing of the sole

To understand the importance of anti-yellowing agents, we first need to understand why the soles of the shoe are yellowed. Here are a few main reasons:

1. Photooxidation reaction caused by light

UV rays in sunlight are a powerful catalyst that can cause unsaturated bonds in sole materials to break and recombine to form yellow compounds. It’s like exposing a piece of white paper to the sun for a long time and eventually turning into yellowed old book pages.

2. Thermal aging caused by high temperature

In industrial environments, high temperature environments (such as kitchens, factory workshops) will make the molecular structure in sole materials more unstable, thereby accelerating the yellowing process. Imagine that a fresh bread will turn from white to burn yellow if it is left in the oven for too long.

3. Effects of oxidation

Oxygen in the air is everywhere, and some additives (such as promoters or vulcanizers) in the sole material are prone to react with oxygen to form colored substances. It’s like the cut apples exposed to the air and the surface will quickly turn brown.

4. Limitations of the material itself

Some common sole materials (such as TPU, EVA or rubber) have a certain tendency to change yellowing. For example, EVA foam is prone to yellowing due to changes in internal chemical bonds during long-term use.

From the above analysis, it can be seen that yellowing is a complex chemical process involving the joint action of multiple factors. Therefore, to effectively inhibit yellowing, a special solution is needed – this is where anti-yellowing agents come in.

3. Basic principles of anti-yellowing agent for soles

Anti-yellowing agent is a functional additive, mainly used to prevent or slow down solesThe material yellows under light, high temperature or oxidation conditions. Its basic principles can be summarized as follows:

1. Absorb UV rays

The UV absorber in the anti-yellowing agent can block the damage of ultraviolet rays to the sole material like a parasol, thereby reducing the occurrence of photooxidation reactions.

2. Scavenge free radicals

Free radicals are one of the important causes of yellowing, and the antioxidant components in anti-yellowing agents can prevent them from further destroying the material structure by capturing these radicals.

3. Stabilize molecular structure

Anti-yellowing agents can also stabilize their molecular structure and reduce their sensitivity to oxygen by chemical reaction with additives in sole materials.

Simply put, anti-yellowing agent is like a “cleaner”, cleaning up the “garbage” that may cause yellowing at any time; it is also like a “security guard”, always protecting the sole materials from outside.

IV. Main types of anti-yellowing agents for soles

Depending on the function and mechanism of action, anti-yellowing agents in the sole can be divided into the following categories:

Category Main Ingredients Mechanism of action Scope of application
Ultraviolet absorber Benzotriazoles, benzophenones Absorb UV energy to prevent photooxidation reaction Light-colored soles, outdoor work shoes
Antioxidants Stealed phenols and amines Catch free radicals and inhibit oxidation reaction Work shoes for use in high temperature environments
Light Stabilizer Trumped amines Dispersing light energy to reduce light degradation Plastic soles
Compound anti-yellowing agent Combination of multiple ingredients Comprehensive multiple mechanisms of action to provide comprehensive protection High performance requirements for tool shoes

1. UV absorber

This type of anti-yellowing agent mainly targets yellowing problems caused by light. They can effectively absorb UV energy and convert it into harmless heat to release it, thereby avoiding the occurrence of photooxidation reaction.

2. Antioxidants

The function of antioxidants is to remove free radicals and prevent them from causing damage to the sole material. They are especially suitable for tool shoes that need to be used in high temperature environments, as high temperatures can aggravate the rate of oxidation reactions.

3. Photo stabilizer

Light stabilizers reduce light degradation by dispersing light energy and are suitable for use in soles made of plastic materials, especially in the case of long-term exposure to sunlight.

4. Complex anti-yellowing agent

Composite anti-yellowing agent combines the above ingredients to provide more comprehensive protection. They are often used in tool shoes with high performance requirements to ensure that the shoes maintain a good appearance and performance in a variety of complex environments.

5. Application case analysis of anti-yellowing agent for soles

In order to better illustrate the actual effect of the anti-yellowing agent, we selected several typical application cases for analysis.

Case 1: Anti-yellowing test of a well-known brand of work shoes

Background: An internationally renowned work shoe brand hopes to improve the yellowing resistance of its products in high temperature environments.
Method: A composite anti-yellowing agent was added to the sole formula, and a 6-month outdoor exposure test was conducted.
Result: Soles without anti-yellowing agents showed obvious yellow spots after the test, while soles with anti-yellowing agents maintained almost the original color.

Test conditions No anti-yellowing agent was added Add anti-yellowing agent
Initial Color White White
Color changes after 6 months of exposure Obvious yellowing Almost no change

Case 2: Research on the anti-yellowing change of EVA soles in a domestic factory

Background: EVA soles produced by a certain factory are prone to yellowing during use, affecting product quality.
Method: By adjusting the formula, add an appropriate amount of UV absorber and antioxidant.
Result: Under the same conditions of use, the degree of yellowing of the improved sole has been reduced by more than 70%.

Test indicators Before improvement After improvement
Yellow Index (YI) 15.8 4.6
Extended service life ratio – 50%

6. The enhancement effect of anti-yellowing agent on the performance of work shoes

In addition to improving the appearance, anti-yellowing agents can also improve the overall performance of tool shoes in many aspects.

1. Improve durability

By inhibiting yellowing, anti-yellowing agents actually extend the service life of the sole material. This means that the shoes can stay in good condition for longer periods of time, reducing the frequency of replacement.

2. Improve comfort

Some anti-yellowing agents also have certain flexibility and elastic enhancement effects, which can make the sole more fit the feet and provide a better comfortable experience.

3. Enhance security

For workers who need to work in high temperature or strong light environments, anti-yellowing agents can not only protect shoes, but also indirectly improve the safety of the working environment.

4. Enhance brand image

A work shoe that always remains as white as new will undoubtedly leave a deep impression on consumers, thereby enhancing the brand’s reputation and market competitiveness.

7. Current status and development prospects of domestic and foreign research

In recent years, with the continuous improvement of people’s performance requirements for work shoes, the research on anti-yellowing agents has also made significant progress. The following are some research results in domestic and foreign literature:

1. Domestic research

  • The journal “Chinese Leather” once published an article that detailed the impact of different types of anti-yellowing agents on EVA soles. Studies have shown that the compound anti-yellowing agent has better effect than single-component products.
  • Another study completed by the Department of Materials Science and Engineering of Tsinghua University pointed out that by optimizing the formulation, the amount of anti-yellowing agent can be reduced by 30%, while still achieving the same protective effect.

2. International Studies

  • A report from the American Rubber and Plastics Association (SPE) shows that the new generation of nanoscaleAnti-yellowing agents are under development and are expected to be put into commercial applications in the next few years.
  • Bayer, Germany, has launched a new hindered amine light stabilizer that can effectively protect sole materials under extreme conditions.

Development prospect

With the continuous emergence of new materials and new technologies, the function of anti-yellowing agents will become more and more powerful. In the future, we can expect more intelligent and environmentally friendly anti-yellowing agents to come out, bringing revolutionary changes to the workwear and shoe industry.

8. Summary and Outlook

As one of the important technological innovations in the field of work shoes, the anti-yellowing agent has shown great potential in practical applications. It brings a significant improvement to tool shoes, both from the appearance and performance perspective. However, we should also realize that the research and development of anti-yellowing agents still faces many challenges, such as how to reduce costs, how to achieve a more environmentally friendly production process, etc.

Looking forward, with the advancement of science and technology and the growth of market demand, anti-yellowing agents will definitely play a more important role in the work shoe industry. Let us wait and see and welcome this new era full of possibilities!

I hope this article can meet your needs! If you have any modifications or supplements, please feel free to let us know.

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