Adhesive Layer Resin Composition for Uniform Multilayer Tube Extrusion
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Solution Overview
Problem
Existing resin compositions for adhesive layers in multilayer tubes exhibit variations in thickness during melt extrusion molding, leading to reduced adhesiveness and inadequate exhibition of layer characteristics.
Innovation Solution
A resin composition comprising a polyphenylene sulfide-based resin, polyamide resin, a first thermoplastic resin with specific functional groups, and a second thermoplastic resin without certain functional groups, with specific weight ratios and terminal amino group concentrations, forming a matrix-domain structure to stabilize thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the adhesive layer is made thinner to increase the volume proportion of functional layers, then the characteristics of the first layer and second layer are better exhibited, but the adhesiveness is reduced and thickness variation becomes more significant
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive layer by specifying precise ratios of polyphenylene sulfide-based resin (A), polyamide resin (B), first thermoplastic resin (C) with functional groups, and second thermoplastic resin (D) without those functional groups. This compositional parameter optimization enables the adhesive layer to maintain uniform thickness (variation of 0.5 mm or less) while preserving adequate adhesiveness and allowing the functional layers to exhibit their characteristics effectively.
2Reliability
If the adhesive layer is made thicker to ensure sufficient adhesiveness, then the adhesiveness to the first layer and second layer is improved, but the volume proportion of the first layer and second layer becomes smaller and their characteristics are not sufficiently exhibited
Solution Approach 1:
The patent creates a composite adhesive layer material comprising four specific resin components: polyphenylene sulfide-based resin (A), polyamide resin (B), first thermoplastic resin (C) containing functional groups (epoxy, acid anhydride, carboxyl, carboxylic acid salt, or carboxylic acid ester), and second thermoplastic resin (D) free of these functional groups. This composite material structure provides both sufficient adhesiveness and controlled thickness, resolving the contradiction between reliability and quantity distribution.
Solution Approach 2:
The patent applies local quality by differentiating the roles of different resin components within the adhesive layer. The first thermoplastic resin (C) with functional groups provides adhesion to specific layers, while the second thermoplastic resin (D) without functional groups provides structural support and thickness stability. This functional differentiation within the adhesive layer enables simultaneous achievement of adequate adhesiveness and controlled thickness.
3Ease of manufacture
If conventional resin compositions are used for the adhesive layer, then the multilayer tube can be manufactured, but the adhesive layer exhibits significant thickness variation during melt extrusion molding
Solution Approach 1:
The patent optimizes the compositional parameters of the adhesive layer by specifying precise weight ratios: 100 parts by weight of polyphenylene sulfide-based resin (A), 80-300 parts by weight of polyamide resin (B), 20-200 parts by weight of first thermoplastic resin (C), and 10-100 parts by weight of second thermoplastic resin (D). This parameter optimization ensures uniform melt flow characteristics during extrusion, achieving thickness variation of 0.5 mm or less while maintaining ease of manufacture.
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 composition effectively suppresses thickness variation in the adhesive layer, enhancing adhesiveness and maintaining the characteristics of the multilayer tube layers.
Implementation Method 1
a polyamide resin (B); a first thermoplastic resin (C) containing at least one type of functional group selected from the group consisting of an epoxy group, an acid anhydride group, a carboxyl group, a carboxylic acid salt, and a carboxylic acid ester
Data Source
AI summary
The present disclosure relates to a resin composition for an adhesive layer. The resin composition contains: a polyphenylene sulfide-based resin (A); a polyamide resin (B); a first thermoplastic resin (C) containing at least one type of functional group selected from the group consisting of an epoxy group, an acid anhydride group, a carboxyl group, a carboxylic acid salt, and a carboxylic acid ester; and a second thermoplastic resin (D) that is free of epoxy groups, acid anhydride groups, carboxyl groups, carboxylic acid salts, and carboxylic acid esters. The resin composition contains, with respect to 100 parts by weight of the polyphenylene sulfide-based resin (A), from 80 to 300 parts by weight of the polyamide resin (B), from 20 to 200 parts by weight of the first thermoplastic resin (C), and from 10 to 100 parts by weight of the second thermoplastic resin (D), and a terminal amino group concentration of the polyamide resin (B) is from 48 to 120 mmol/kg.