Degradability test of nylon hot melt wire

Degradability test of nylon hot melt wire

Introduction
In today’s global environmental awareness, the degradability of materials has become an important indicator to measure their environmental friendliness. As a widely used functional fiber material, the degradability test of nylon hot melt wire is not only related to the market competitiveness of the product, but also to the future of environmental protection and sustainable development. This article will explore in depth the degradability test method, influencing factors and the significance of the test results of nylon hot melt wire to international wholesale buyers.

Characteristics and application of nylon hot melt wire
Nylon hot melt wire is a functional fiber based on low melting point polyamide, with the following significant characteristics:
Precise and controllable melting point: The melting point ranges from 85℃ to 180℃, which can be flexibly adjusted according to different processing requirements.
Good mechanical properties: The breaking strength can reach 5.0-6.4 g/d, high wear resistance, and both high strength and flexibility.
Excellent chemical stability: acid and alkali corrosion resistance, detergent resistance, and good dyeability.
Application fields
Nylon hot melt wire is widely used in many fields such as textile, industry and medical:
Textile field: used for 3D flying woven uppers, seamless underwear, lace, etc., to improve product durability and aesthetics.
Industrial field: used for automotive interiors, electronic appliances, cable sheaths, etc., providing high temperature and corrosion resistant solutions.
Medical field: can be used as a bioabsorbable material for wound dressings, sutures, etc.
The importance of degradability testing
With the global emphasis on environmental protection, degradability has become an important criterion for measuring the environmental friendliness of materials. The degradability test of nylon hot melt wire can not only help manufacturers optimize product formulas, but also provide important decision-making basis for international wholesale buyers to ensure that the purchased products meet environmental protection requirements.

Degradability test method
1. Biodegradability test
Biodegradability test is an important method to evaluate the degradation ability of nylon hot melt wire in the natural environment. Commonly used test standards include:
ASTM D6400: Applicable to evaluate the biodegradability of plastic materials under composting conditions.
ISO 14855: The biodegradability of a material is evaluated by measuring the amount of carbon dioxide released by the material under the action of microorganisms.
2. Thermal degradability test
The thermal degradability test is used to evaluate the stability of nylon hot melt wire under high temperature conditions. Common methods include:
Thermogravimetric analysis (TGA): In a nitrogen atmosphere, the temperature is increased from 30℃ to 400℃ at a rate of 30℃/min to observe the mass change of the material.
Differential scanning calorimetry (DSC): Used to measure the thermal effect of the material during heating and evaluate its thermal stability.
3. Hydrolytic degradability test
The hydrolytic degradability test is used to evaluate the degradation ability of nylon hot melt wire in a water environment. Common methods include:
Accelerated hydrolysis test: Place the sample in a high temperature and high humidity environment to simulate the natural hydrolysis process.
Natural hydrolysis test: Place the sample in a natural environment and observe its degradation for a long time.

Factors affecting degradability
1. Material composition
The degradability of nylon hot melt wire is affected by its chemical composition. For example, adding bio-based polyamide can significantly improve its biodegradability.
2. Environmental conditions
Environmental factors such as temperature, humidity, light and microbial species have an important influence on the degradation rate of nylon hot melt.
3. Material structure
The molecular structure and crystallinity of nylon hot melt also affect its degradation performance. Nylon hot melt with high crystallinity generally has higher degradation resistance.
Test results and analysis
1. Biodegradability test results
Biodegradability tests conducted according to ASTM D6400 and ISO 14855 standards show that bio-based nylon hot melt exhibits good biodegradability under composting conditions. Its degradation rate is significantly faster than that of traditional plastics, and the degradation products are harmless to the environment.
2. Thermal degradation test results
Thermogravimetric analysis (TGA) results show that nylon hot melt exhibits good thermal stability under high temperature conditions. Below 300°C, the mass loss is small, indicating that it has high durability in high temperature applications.
3. Hydrolysis degradation test results
Accelerated hydrolysis test shows that nylon hot melt yarn can gradually degrade under high temperature and high humidity conditions. Natural hydrolysis test further confirms its degradation ability in the natural environment.

Conclusion
The degradability test of nylon hot melt yarn is an important part to ensure its environmental friendliness. Through biodegradability, thermal degradability and hydrolysis degradation tests, its degradation ability under different environmental conditions can be comprehensively evaluated.