Polyurethane Elastic Fiber Composition for Stable Textile Properties
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Solution Overview
Problem
Existing polyurethane elastic fibers fail to provide both high elasticity and durability, and their properties change over time, leading to issues in inventory control and fabric stability.
Innovation Solution
A polyurethane elastic fiber is produced using a polymer diol, diisocyanate, and chain extender without tertiary amines, combined with a polyurethane or polyurea containing a tertiary amine nitrogen bonded to a sulfonic acid compound, forming a sulfonic acid amine, to enhance stability and elasticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyurethane urea elastic fibers are used to achieve high elasticity, then elasticity is improved, but strength deteriorates and fiber properties change over time
Solution Approach 1:
The invention changes the chemical composition parameters by using a polyurethane urethane base polymer with specific molecular weight range (10,000-50,000) and incorporating a small amount (0.1-10 wt%) of polyurethane urea segments, thereby achieving both high strength and stable fiber properties over time while maintaining elasticity
Solution Approach 2:
The invention creates a composite fiber structure by combining polyurethane urethane and polyurethane urea segments in a single fiber, where the polyurethane urethane provides strength and stability while the polyurethane urea contributes elasticity, achieving synergistic effects
2Strength
If polyurethane urea elastic fibers are used to achieve high elasticity, then elasticity is improved, but manufacturing and inventory control become difficult
Solution Approach 1:
The invention optimizes the polyurethane composition parameters and spinning conditions to achieve stable fiber properties that are easier to control during manufacturing and inventory management, while maintaining high elasticity through the incorporated polyurethane urea segments
3Strength
If conventional polyurethane elastic fibers are used, then production is simpler, but recovery stress is lower and permanent distortion is higher
Solution Approach 1:
The invention applies local quality by incorporating polyurethane urea segments specifically in the elastic regions of the fiber structure, while maintaining polyurethane urethane in other regions, thereby improving recovery stress and reducing permanent distortion without requiring complete structural reconfiguration
Data Source
AI summary
[Problem] An object of the present invention is to provide a polyurethane elastic fiber with excellent textile properties and textile property stability over time by including in the polyurethane elastic fiber a specific polyurethane having in the molecular structure a salt structure in which specific functional groups are ionically bonded to each other, and to provide a method for producing such a polyurethane elastic fiber. Another object of the present invention is to provide a polyurethane elastic fiber that allows for easier inventory control and processing condition management of fibers when used, and that can be used to obtain fabrics with stable fabric properties and fabric quality, and to provide a method for producing such a polyurethane elastic fiber. [Solution] A polyurethane elastic fiber comprising polyurethane A and additive B below. Polyurethane A: A polyurethane using as starting materials a polymer diol, a diisocyanate, and a chain extender, and not having a tertiary amine in the skeleton. Additive B: A polyurethane or polyurea using as starting materials a diol and/or a diamine and a diisocyanate, and having a tertiary amine nitrogen bonded only to a non-aromatic carbon in the skeleton, the tertiary amine nitrogen bonding ionically to a sulfonic acid compound to form a sulfonic acid amine.