Wollastonite-Reinforced Polyamide Snap Fastener
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Solution Overview
Problem
Existing resin snap fasteners face challenges in achieving high heat resistance, stiffness, toughness, and resistance to stiffness deterioration due to water absorption, while also avoiding the release of environmental hormones.
Innovation Solution
A resin snap fastener is produced by molding a composition containing 45 to 100 parts by weight of wollastonite per 100 parts by weight of polyamide resin, which balances heat resistance, stiffness, and toughness, and prevents stiffness deterioration from water absorption, using polyamide resin and inorganic filler wollastonite.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If polyacetal resin is used for snap fasteners, then heat resistance is improved, but the resin softens at low temperature causing molding problems and environmental hormone release
Solution Approach 1:
The patent uses a composite material system consisting of polyamide resin as the base polymer and wollastonite as the inorganic filler. This composite structure allows the organic polyamide to provide heat resistance while the inorganic wollastonite maintains structural integrity at high temperatures, preventing the softening issue of pure polyacetal and enabling successful molding while avoiding environmental hormone release.
2Temperature
If polyamide resin is used for snap fasteners, then heat resistance is improved, but stiffness and toughness are low causing stiffness deterioration when absorbing water
Solution Approach 1:
The patent creates a composite material where wollastonite particles are dispersed in the polyamide resin matrix. The inorganic wollastonite filler provides the stiffness and toughness that pure polyamide lacks, while the polyamide matrix provides heat resistance. This synergistic combination resolves the contradiction between heat resistance and mechanical strength, preventing stiffness deterioration even when water is absorbed.
3Temperature
If inorganic filler is added to polyamide resin, then heat resistance and stiffness are improved, but the quantity and type of filler must be precisely controlled to achieve optimal toughness and prevent stiffness deterioration from water absorption
Solution Approach 1:
The patent specifies precise parameter ranges for the inorganic filler content (45-100 parts by weight per 100 parts by weight of polyamide resin) and identifies wollastonite as the specific filler type. By controlling these parameters within defined ranges, the patent achieves optimal balance among heat resistance, stiffness, toughness, and water absorption resistance, transforming a complex material design problem into a controlled parameter optimization.
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 solution results in a snap fastener with improved handleability and durability, maintaining high heat resistance and toughness, and preventing environmental hormone release, with enhanced performance in repeated use and water absorption resistance.
Implementation Method 1
the snap fastener according to an exemplary embodiment of the present invention is produced by molding a resin composition containing 45 to 100 parts by weight of wollastonite per 100 parts by weight of polyamide resin
Implementation Method 2
a resin composition containing 45 to 100 parts by weight of wollastonite per 100 parts by weight of polyamide resin
Data Source
AI summary
Provided is a resin snap fastener, which has excellent heat resistance, rigidity and toughness, and reduced decrease in rigidity when absorbing water, and which does not emit endocrine disrupters. The snap fastener is obtained by molding a resin composition comprising 45-100 parts by weight of wollastonite with respect to 100 parts by weight of a polyamide resin.