Polyamide 5X staple fiber
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Solution Overview
Problem
Existing carpet fibers, particularly chemical fiber carpets made of nylon, face issues with electrostatic absorption of dust and corrosion, while pure wool carpets lack durability and are costly. There is a need for a fiber that combines high strength, elasticity, and cost-effectiveness with improved mechanical properties and softness.
Innovation Solution
Development of a polyamide 5× staple fiber with a denier of 8.0-30.0D, breaking strength of 2.0-6.0 cN/dtex, and elongation at break of 30%-100%, produced through polymerization of 1,5-pentamethylenediamine and dibasic acid, followed by hot-melting and spinning, with specific cooling and post-processing treatments to enhance denier and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If pure wool fibers are used for carpets, then high tensile force and good elasticity are achieved, but high cost and low durability are problems
Solution Approach 1:
The patent creates a blended carpet fiber composite consisting of 20-80 wt% wool fibers and 80-20 wt% polyamide staple fibers. This composite structure combines the high tensile force and elasticity of wool with the durability, wear resistance, and cost-effectiveness of polyamide, resolving the contradiction between strength and cost by leveraging the complementary properties of both materials in a blended formulation.
2Strength
If chemical fiber carpets made of nylon are used, then good resilience and wear resistance are achieved, but electrostatic absorption of dust and corrosion occur
Solution Approach 1:
The blended fiber composite combines polyamide's inherent wear resistance with wool's natural anti-static properties. Wool fibers do not generate significant static electricity, thereby counteracting the electrostatic dust attraction problem of pure polyamide carpets while preserving the wear resistance benefits of the polyamide component.
3Strength
If polyamide 5× staple fiber with larger denier is produced, then higher strength and good mechanical properties are achieved, but softness may be reduced
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: controlling denier within 8.0-30.0D, breaking strength within 2.0-6.0 cN/dtex, elongation at break within 30%-100%, and initial modulus within 20-50 cN/dtex. By adjusting these parameters within specific ranges and blending with wool fibers, the patent achieves both high strength and maintained softness, as wool contributes to the soft hand feel while polyamide provides the mechanical strength.
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 polyamide 5× staple fiber offers improved mechanical properties, softness, and reduced environmental impact due to bio-based materials, and when blended with wool, results in a yarn with enhanced wear resistance and dyeability, reducing production costs and environmental footprint.
Implementation Method 1
the polyamide 5× melt is sequentially subjected to cooling and pre-spinning to obtain the Undrawn yarn (UDY)
Implementation Method 2
polymerization of 1,5-pentamethylenediamine and dibasic acid, followed by hot-melting and spinning
Data Source
AI summary
The present disclosure provides a polyamide 5× staple fiber, a preparation method and use thereof. The polyamide 5× staple fiber has a denier of 8.0-30.0D, a breaking strength of 2.0-6.0 cN/dtex, and an elongation at break of 30-100%. The polyamide 5× staple fiber has good mechanical properties and softness, and a blended wool yarn for manufacturing carpets with good mechanical properties, dyeability, and wear resistance can be obtained by using the polyamide 5× staple fiber.