Polyamide Artificial Hair Fiber Drip Resistance
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Solution Overview
Problem
Fibers for artificial hair using aliphatic polyamide face issues with drip resistance during combustion and compatibility with bromine-based flame retardants, leading to defects and reduced productivity during processing.
Innovation Solution
A resin composition comprising aliphatic polyamide, semi-aromatic polyamide obtained by polycondensation of aliphatic diamine and aromatic dicarboxylic acid, and a bromine-based flame retardant, with specific ratios and additives to enhance drip resistance, texture, and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bromine-based flame retardant is added to polyamide to improve drip resistance, then drip resistance is improved, but the bromine-based flame retardant causes insufficient dispersion in the polyamide resin during melt kneading, leading to yarn breaking and reduced productivity
Solution Approach 1:
An auxiliary flame retardant is introduced as an intermediary substance to facilitate the dispersion of the bromine-based flame retardant in the polyamide resin. The auxiliary flame retardant acts as a mediator that improves compatibility between the bromine-based flame retardant and polyamide, enabling uniform distribution during melt kneading without causing yarn breaking or processing defects.
Solution Approach 2:
The invention uses a composite flame retardant system combining bromine-based flame retardant and auxiliary flame retardant in specific weight ratios (bromine-based: 5-50 parts by weight, auxiliary: 1-20 parts by weight based on 100 parts by weight of polyamide). This composite approach leverages the synergistic effects of both flame retardants to achieve both good dispersion and effective drip resistance.
2Shape
If aliphatic polyamide is used for artificial hair to provide good texture like human hair, then texture is improved, but the fiber has a risk of dropping molten resin during combustion, causing burning and safety issues
Solution Approach 1:
The invention converts the harmful effect of molten resin dripping during combustion into a beneficial outcome by using the melt flow characteristics of aliphatic polyamide in combination with flame retardants. The controlled addition of bromine-based and auxiliary flame retardants modifies the combustion behavior to suppress uncontrolled dripping while maintaining the desirable texture properties of aliphatic polyamide.
Solution Approach 2:
The invention changes the chemical composition parameters of the polyamide system by introducing specific flame retardant additives in controlled amounts. This modifies the thermal and combustion properties of the material, transforming it from a high-drip-risk material to one with excellent drip resistance, while preserving the texture characteristics through careful parameter selection.
3Ease of manufacture
If vinyl chloride resin is used for artificial hair to achieve good processability and cost reduction, then processability and cost are improved, but the fiber has poor heat resistance and may be fused and frizzled at temperatures of 100°C or more
Solution Approach 1:
The invention changes the fundamental material parameter from vinyl chloride resin to aliphatic polyamide, which inherently provides superior heat resistance. This parameter change enables the fiber to withstand curling iron temperatures (100°C or more) without fusion or frizzling, while still maintaining good processability through optimized extrusion and spinning parameters specific to polyamide materials.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides fibers with excellent drip resistance, texture, and productivity, improving processing efficiency and safety while maintaining a human-hair-like appearance and performance.
Implementation Method 1
semi-aromatic polyamide with a skeleton obtained by polycondensation of aliphatic diamine and aromatic dicarboxylic acid
Data Source
AI summary
Polyamide-based fiber for artificial hair that is excellent in drip resistance, texture, and productivity is provided. According to the present invention, provided is fiber for artificial hair, including a resin composition containing: aliphatic polyamide; semi-aromatic polyamide with a skeleton obtained by polycondensation of aliphatic diamine and aromatic dicarboxylic acid; and a bromine-based flame retardant.