Polyamide Apparel Yarn with Polyetheramine for Moisture Regain
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Solution Overview
Problem
Existing methods for incorporating polyether segments into polyamides to enhance hydrophilicity in nylon yarns face challenges such as inconsistent polymer compositions, poor processing properties, and susceptibility of ester linkages to hydrolysis, making it difficult to produce spinnable yarns with desirable hydrophilic properties.
Innovation Solution
A polyamide textile yarn comprising nylon and polyetherdiamine with a molecular weight of at least 1500 and an Amine Hydrogen Equivalent Weight (AHEW) less than 10% higher than ideal, which is processed into apparel textiles through extrusion and spinning, allowing for improved moisture regain and processing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyether segments are incorporated into polyamides to improve hydrophilicity, then moisture regain is improved, but polymer composition consistency deteriorates
Solution Approach 1:
The patent specifies precise parameter ranges for the polyetherdiamine components (molecular weight ≥1500, AHEW within 10% of idealized value) and their content in the polyamide (5-30 wt%). These controlled parameter changes ensure consistent polymer composition while maintaining improved hydrophilicity and moisture regain properties.
2Reliability
If polyether segments are incorporated into polyamides to improve hydrophilicity, then moisture regain is improved, but processing properties deteriorate
Solution Approach 1:
The patent establishes specific parameter ranges for polyetherdiamine molecular weight (≥1500) and AHEW (within 10% of idealized), along with controlled content (5-30 wt%). These parameter optimizations ensure the polymer maintains both improved hydrophilicity and adequate processing properties for yarn spinning.
3Ease of manufacture
If ester linkages are used to connect polyether and polyamide blocks, then polymer formation is achieved, but hydrolysis resistance deteriorates
Solution Approach 1:
The patent eliminates ester linkages from the polymer structure by using polyetherdiamine components that form amide bonds instead. This extraction of the problematic ester linkage function while retaining the desired block copolymer structure resolves the hydrolysis resistance issue while maintaining polymer formation capability.
4Productivity
If polyetherdiamine with low molecular weight is used, then polymerization reactivity is improved, but yarn spinning capability deteriorates
Solution Approach 1:
The patent specifies a minimum molecular weight threshold for the polyetherdiamine component (≥1500) and controls the AHEW parameter to be within 10% of the idealized value. These parameter settings balance polymerization reactivity with the ability to form spinnable yarns with appropriate mechanical properties.
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 resulting yarn exhibits improved hydrophilicity, tactile aesthetics, and wear comfort, with a moisture regain ranging from 10% to 30%, enhancing the properties of apparel textiles while maintaining processability and stability.
Implementation Method 1
The desirable property of hydrophilicity in nylon yarns for use in apparel applications is often imparted through incorporation of oxyethylene (—OCH2CH2—) repeat units
Implementation Method 2
said process comprising extruding said molten polyamide through a spinneret plate containing capillary orifices; and forming a yarn from filaments emerging from the spinneret plate
Data Source
AI summary
An apparel textile yarn includes a polyamide. The polyamide includes a nylon and a polyetheramine. The polyetheramine has a molecular weight of at least 1500 and an Amine Hydrogen Equivalent Weight (AHEW) of less than 10 percent higher than the idealized AHEW for the polyetheramine. The polyamide may have a moisture regain ranging from about 10% to about 30%.