Para-type Aromatic Copolyamide Fiber High-Tension Hot Drawing
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Solution Overview
Problem
Para-type wholly aromatic copolyamide fibers produced by wet spinning or half-dry half-wet spinning methods face challenges in achieving high tensile elastic modulus due to the rigid molecular structure, which requires high-temperature plasticization or solvent swelling, leading to inferior mechanical properties compared to anisotropic fibers, and heat-treatment under high tension often results in fiber breakage and reduced quality.
Innovation Solution
Subjecting para-type wholly aromatic copolyamide raw material fibers to high-tension hot drawing within specific tension and temperature ranges (1-20% of breaking tension and 50-450°C) to enhance molecular orientation and tensile elastic modulus, while avoiding contact with metal to prevent yarn breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high-tension heat treatment is applied to improve tensile elastic modulus, then molecular orientation increases, but fiber breakage occurs and quality decreases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the tension (1-20% of breaking tension) and temperature (50-450°C) during hot drawing to achieve optimal molecular orientation without fiber breakage. This resolves the contradiction by finding the optimal parameter range that improves tensile elastic modulus while preventing quality degradation.
Solution Approach 2:
The patent performs preliminary plasticization through hot drawing at controlled tension and temperature before final fiber formation. This preliminary action prepares the molecular structure for subsequent high-tension treatment, enabling improved tensile elastic modulus without excessive fiber breakage during later processing.
2Ease of manufacture
If high-temperature plasticization is applied to enable drawing, then drawing becomes possible, but tensile elastic modulus becomes inferior compared to anisotropic fibers
Solution Approach 1:
The patent changes the temperature parameter during hot drawing (50-450°C range) to achieve optimal plasticization that enables drawing while preserving molecular orientation capability. This resolves the contradiction by finding the temperature window that provides sufficient drawability without compromising the potential for high tensile elastic modulus.
Solution Approach 2:
The patent applies dynamic control of tension and temperature parameters during the drawing process, adjusting them in coordination to maintain optimal conditions for both plasticization and molecular orientation. This dynamic approach enables simultaneous achievement of drawability and high tensile elastic modulus.
3Ease of manufacture
If wet spinning or half-dry half-wet spinning is used to produce copolyamide fiber, then production is feasible, but tensile elastic modulus is insufficient due to rigid molecular structure
Solution Approach 1:
The patent applies parameter changes by controlling the tension (1-20% of breaking tension) and temperature (50-450°C) during hot drawing to overcome the limitations of wet spinning for copolyamide fibers. This resolves the contradiction by optimizing processing parameters to achieve both spinnability and high tensile elastic modulus despite the rigid molecular structure.
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 process results in fibers with improved tensile elastic modulus (630 cN/dtex or more) and suppressed creep and tensile strength loss at high temperatures, suitable for industrial applications like resin and rubber reinforcement, maintaining high performance without significant yarn breakage.
Implementation Method 1
hot drawing being performed under a tension of 1% or more and less than 20% of the breaking tension of the para-type wholly aromatic copolyamide raw material fiber and at a temperature of 50°C or more and 450°C or less
Implementation Method 2
hot drawing being performed under a tension of 1% or more and less than 20% of the breaking tension
Data Source
AI summary
Provided is a para-type wholly aromatic copolyamide drawn fiber having a tensile elastic modulus of 630 cN/dtex or more. The fiber is obtained by subjecting a para-type wholly aromatic copolyamide raw material fiber to high-tension hot drawing under a tension and at a temperature within specific ranges.