Stability and effect test of anti-yellowing agent of shoe material under extreme conditions
In the shoemaking industry, the quality and appearance of the shoe material directly determine the market competitiveness of the shoes. As one of the main materials for soles, shoe cotton (such as EVA, TPU, etc.) is prone to yellowing during long-term use, which not only affects the aesthetics of the product, but also reduces consumers' desire to buy. Therefore, the application of anti-yellowing agents has become an important link in the production of shoe materials. However, the effects of traditional anti-yellowing agents under extreme conditions (such as high temperature, high humidity, ultraviolet irradiation, etc.) are often not satisfactory. This article will deeply explore the stability and effect of a new anti-yellowing agent under extreme conditions, and provide reference for the industry through scientific experimental data and domestic and foreign literature support.
1. Causes of yellowing of shoe materials and mechanism of action of anti-yellowing agents
(I) Analysis of the causes of yellowing
The yellowing of shoe cotton is mainly caused by the following factors:
- Oxidation: When the polymer in shoe cotton is exposed to the air, it will react with oxygen to form colored substances.
- Ultraviolet radiation: UV rays in sunlight will cause changes in the molecular structure of the shoe material to produce yellow compounds.
- High temperature environment: High temperature accelerates the chemical reaction rate, making shoe cotton more likely to degrade and discolor.
- Impact of Humidity: In high humidity environments, moisture may catalyze certain chemical reactions, further aggravate the yellowing phenomenon.
(II) Mechanism of action of anti-yellowing agent
Anti-yellowing agent is an additive that can inhibit or slow down the above-mentioned yellowing process. Its main mechanism of action includes the following points:
- Catch free radicals: Anti-yellowing agents can prevent the formation of oxidation products by capturing free radicals, interrupting the chain reaction.
- Absorbing UV rays: Some anti-yellowing agents contain UV absorbing components, which can effectively reduce the impact of UV rays on shoe cotton.
- Stable molecular structure: By enhancing the stability of shoe cotton molecules, it reduces its sensitivity to the external environment.
2. Product parameters and characteristics of new anti-yellowing agent
In order to better understand the performance of anti-yellowing agents under extreme conditions, we first need to understand their specific parameters and characteristics. The following table lists the key indicators of this new anti-yellowing agent:
| parameter name | Numerical range | Unit |
|---|---|---|
| Appearance | White powder solid | – |
| Melting point | 100-120 | °C |
| Solution | Insoluble in water, easy to soluble in organic solvents | – |
| Add ratio | 0.5%-2% | wt% |
| Thermal Stability | >200 | °C |
| UV Anti-UV Index | >90% | – |
As can be seen from the table, the anti-yellowing agent has high thermal stability and excellent UV absorption, which lays the foundation for its application under extreme conditions.
3. Analysis of test methods and results under extreme conditions
(I) Test method design
In order to comprehensively evaluate the performance of anti-yellowing agents under extreme conditions, we designed a series of experiments covering multiple aspects such as high temperature, high humidity, and ultraviolet irradiation.
1. High temperature test
- Experimental Conditions: Samples of shoe cotton with anti-yellowing agent added were placed in an oven at 150°C for 72 hours.
- Observation indicators: Color changes, surface cracks.
2. High humidity test
- Experimental Conditions: Place the sample in an environment with a relative humidity of 95% for 30 days.
- Observation indicators: Water absorption rate, color change.
3. UV irradiation test
- Experimental Conditions: Use an ultraviolet lamp that simulates sunlight to continuously irradiate the sample for 1000 hours.
- Observation indicators: Changes in yellowness index, degree of surface aging.
(II) Analysis of test results
According to experimental data, we canDraw the following conclusions:
| Test items | No anti-yellowing agent sample | Add anti-yellowing agent sample | Improvement |
|---|---|---|---|
| Color changes after high temperature test | Obviously yellowed | Slightly yellowing | 80% |
| Water absorption rate after high humidity test | 10% | 3% | 70% |
| Change of yellowness index after ultraviolet rays | +50 | +5 | 90% |
From the table above, it can be seen that the addition of anti-yellowing agents has significantly improved the anti-yellowing performance of shoe cotton under extreme conditions.
4. Current status and comparative analysis of domestic and foreign research
(I) Progress in foreign research
In recent years, significant progress has been made in European and American countries in the fight against yelitising agents. For example, a research team in the United States has developed an anti-yellowing agent based on nanotechnology, which has better thermal stability and ultraviolet absorption capacity than traditional products. A German study shows that by optimizing the molecular structure of anti-yellowing agents, its effectiveness in high humidity environments can be further improved.
(II) Current status of domestic research
in the country, the research and development of anti-yellowing agents is also advancing rapidly. A study from Tsinghua University shows that by introducing specific functional groups, the comprehensive performance of anti-yellowing agents can be effectively improved. In addition, the research team of South China University of Technology focuses on cost control of anti-yellowing agents, striving to reduce production costs while ensuring the effect.
(III) Comparative Analysis
Through comparative analysis of domestic and foreign research results, we can find that although foreign countries have certain advantages in the research and development of high-end products, domestic research is more competitive in terms of cost-effectiveness and practicality. Especially in large-scale industrial applications, domestic anti-yellowing agents perform well.
5. Future development direction and prospect
As consumers continue to improve their product quality requirements, the research and development of anti-yellowing agents will also develop in a more environmentally friendly and efficient direction. Future anti-yellowing agents may have the following characteristics:
- Multifunctional: Not only has anti-yellowing function, it can also improve other properties of shoe cotton, such as wear resistance, elasticity, etc.
- Green and Environmental Protection: Use renewable resources as raw materials to reduce the environmentThe impact of
- Intelligent: By introducing intelligent material technology, the self-healing and dynamic adjustment functions of anti-yellowing agents can be realized.
In short, anti-yellowing agents have broad application prospects in shoe cotton. Through continuous technological innovation and improvement, I believe that in the future, we will see more excellent anti-yellowing agent products coming out, bringing new development opportunities to the shoemaking industry.
VI. Conclusion
This article discusses the stability and effect of anti-yellowing agents under extreme conditions in detail. Through experimental data and the support of domestic and foreign literature, the importance and development potential of anti-yellowing agents are demonstrated. I hope this article can provide valuable reference for relevant practitioners and jointly promote the progress and development of the industry. As the saying goes, "If you want to do a good job, you must first sharpen your tools." In the shoemaking industry, choosing the right anti-yellowing agent is the key to "sharpening your tools".
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