Polyamide Fiber High-Temperature Dyeing Rigidity
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Solution Overview
Problem
Polyamide fibers exhibit poor heat resistance and wrinkle resistance when interwoven or interknitted with polyester fibers during high-temperature dyeing, leading to fabric wrinkling and reduced product strength.
Innovation Solution
Development of polyamide fibers with a single fiber fineness of less than 5 dtex, stress per unit fineness of 0.7 cN/dtex or more at 3% elongation, and 2.0 cN/dtex or more at 15% elongation, along with a high biomass-derived monomer content of 50% or more, which maintains rigidity and strength even after boiling water treatment, and are produced using specific polycondensation methods and additives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If polyamide fibers are interwoven or interknitted with polyester fibers for producing chambray fabrics, then fabric versatility and design flexibility are improved, but wrinkle resistance and heat resistance deteriorate during high-temperature dyeing
Solution Approach 1:
The invention changes the molecular structure parameters of polyamide fibers by incorporating cyclic carbonate units into the polymer chain. This structural modification raises the glass transition temperature and improves heat resistance, allowing the fibers to maintain wrinkle resistance during high-temperature dyeing processes (120-130°C) when used in combination with polyester fibers for chambray fabric production.
Solution Approach 2:
The invention creates a composite polyamide structure by integrating cyclic carbonate units alongside traditional amide linkages in the polymer chain. This composite approach combines the desirable properties of both structural elements, achieving improved thermal stability and wrinkle resistance while maintaining the fabric versatility needed for chambray applications.
2Ease of manufacture
If polyamide fibers are subjected to high-temperature dyeing (120-130°C) to match polyester fiber dyeing conditions, then dyeing process simplification is improved, but fiber strength and wrinkle resistance deteriorate
Solution Approach 1:
The invention modifies the thermal parameters of polyamide fibers through cyclic carbonate incorporation, raising the glass transition temperature to above 80°C. This parameter change enables the fibers to withstand high-temperature dyeing processes (120-130°C) without strength degradation, allowing simplified single-batch dyeing of polyamide-polyester blends while maintaining fiber integrity.
3Adaptability or versatility
If polyamide fibers with high elongation (53% or more) are used to improve flexibility, then adaptability is improved, but wrinkle resistance and product strength deteriorate
Solution Approach 1:
The invention changes the molecular architecture parameters by introducing cyclic carbonate units that create a more rigid polymer backbone. This structural modification reduces excessive fiber elongation while maintaining adequate flexibility, resulting in improved wrinkle resistance and product strength without completely sacrificing the adaptability needed for fabric construction.
Data Source
Figure 1
AI summary
The present invention relates to a polyamide fiber which has a single fiber fineness of less than 5 dtex, and has a stress per unit fineness of 0.7 cN/dtex or more in 3% elongation in a tensile test of the fiber, in which a stress F1 in 3% elongation in a tensile test of the fiber before 100°C boiling water treatment and a stress F2 in 3% elongation in a tensile test of the fiber after the treatment satisfy the following formula (1): F2/F1>0.7