Polyamide 6/66 Composition for Heat-Resistant Low-Warp Electrical Parts
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Solution Overview
Problem
Existing polyamide-based compositions for electrical components face challenges in achieving high heat resistance, isotropic shrinkage behavior, and good self-extinguishing properties, particularly in thin wall thicknesses, often requiring halogen- or phosphorus-based flame retardants that pose environmental and performance issues.
Innovation Solution
A composition comprising polyamide 6 or 66, non-fibrous and non-foamed ground glass with specific particle size distribution, chopped long glass fibers, melamine cyanurate, and titanium dioxide, which provides excellent heat resistance, flame retardancy, and isotropic shrinkage behavior without using halogen- or phosphorus-based additives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If glass fibers are used as fillers to improve heat resistance, then heat resistance is improved, but anisotropic shrinkage and warping occur during processing
Solution Approach 1:
The glass reinforcement is segmented into two distinct forms: ground glass particles (non-fibrous) and chopped glass fibers. The ground glass provides isotropic shrinkage behavior, while the chopped fibers (shorter length) provide heat resistance with reduced anisotropy compared to long fibers.
Solution Approach 2:
Different regions of the filler system serve different functions: ground glass particles primarily address shrinkage uniformity and isotropy, while chopped glass fibers primarily address heat resistance and mechanical reinforcement. This local differentiation of functions resolves the contradiction between heat resistance and shrinkage uniformity.
2Reliability
If halogen- or phosphorus-based flame retardants are used to achieve good self-extinguishing properties, then flame retardancy is improved, but environmental harm and corrosive deposits occur
Solution Approach 1:
The patent converts the traditionally harmful halogen- and phosphorus-based flame retardants into environmentally benign alternatives. By using ground glass particles and melamine cyanurate, the system achieves equivalent or superior flame retardancy (GWFI > 960°C) without the harmful environmental and corrosive effects of conventional flame retardants.
Solution Approach 2:
The flame retardancy mechanism is changed from chemical (halogen/phosphorus compounds) to physical and alternative chemical mechanisms (ground glass particle formation, melamine cyanurate decomposition). This parameter change in the flame retardant chemistry achieves the same safety goal without the harmful side effects.
3Manufacturing precision
If non-fibrous fillers are used to achieve isotropic shrinkage, then shrinkage uniformity is improved, but heat resistance becomes insufficient
Solution Approach 1:
The patent merges two types of glass fillers: ground glass particles (for isotropic shrinkage) and chopped glass fibers (for heat resistance). This combination achieves both isotropic shrinkage behavior and high heat resistance (HDT > 130°C), resolving the contradiction between shrinkage uniformity and heat resistance.
Solution Approach 2:
The filler system is a composite of ground glass particles and chopped glass fibers within the polyamide matrix. This composite approach allows the ground glass to provide isotropic shrinkage while the chopped fibers provide enhanced heat resistance and mechanical properties, achieving both goals simultaneously.
4Temperature
If long glass fibers are used to improve heat resistance, then heat resistance is improved, but the wicking effect deteriorates self-extinguishing properties
Solution Approach 1:
The glass reinforcement is segmented into ground glass particles and chopped glass fibers (shorter than continuous fibers). This segmentation reduces the wicking effect compared to long continuous fibers while maintaining heat resistance through the combined action of particles and short fibers.
Solution Approach 2:
The patent eliminates the wicking effect problem by replacing long continuous glass fibers with chopped glass fibers and ground glass particles. This substitution maintains the heat resistance benefits of glass reinforcement while removing the capillary action that causes the wicking effect and compromises self-extinguishing properties.
Data Source
AI summary
The present invention relates to compositions based on polyamide 6 (PA 6) or polyamide 66 (PA 66) containing melamine cyanurate, titanium dioxide, glass fibers and non-fibrous and non-foamed ground glass with a special particle size distribution, geometry and optionally a sizing, as well as the production and use of the compositions according to the invention for the manufacture of products of the electrical industry, preferably electrical components, particularly preferably for the manufacture of residual current circuit breakers and miniature circuit breakers.