Shielding Resin Composition That Prevents Flame Retardant Migration
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Solution Overview
Problem
Existing polymer shielding materials face challenges in maintaining electromagnetic shielding performance and flame retardancy under high-temperature and high-humidity conditions due to flame retardant migration, which affects surface electrical conductivity.
Innovation Solution
A resin composition comprising a polyamide resin, carbon-based fillers, non-halogenated flame retardants, and an anti-blooming agent is developed, with specific ratios and types of components to inhibit flame retardant migration and maintain shielding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phosphorus-based flame retardants are used in polyamide resins for electromagnetic shielding, then flame retardancy is improved, but flame retardant migration occurs under high-temperature and high-humidity conditions, leading to decreased electromagnetic shielding performance
Solution Approach 1:
Silane-modified polyethylene wax is introduced as an intermediary substance between the phosphorus-based flame retardant and the polyamide resin matrix. This intermediary agent modifies the surface properties of the flame retardant particles, improving their compatibility with the resin and preventing their migration to the surface under high-temperature and high-humidity conditions, thereby maintaining stable electromagnetic shielding performance while preserving flame retardancy
Solution Approach 2:
The invention uses a composite approach by combining phosphorus-based flame retardant with silane-modified polyethylene wax in a polyamide resin system. This composite material strategy allows the flame retardant to maintain its fire-retardant function while the modified polyethylene wax component prevents migration, thus resolving the contradiction between achieving flame retardancy and maintaining composition stability
2Reliability
If halogenated flame retardants are used to achieve flame retardancy, then flame retardant effectiveness is improved, but environmental issues arise leading to their exclusion
Solution Approach 1:
The invention changes the chemical composition parameter of the flame retardant from halogenated to phosphorus-based compounds. This parameter change maintains the flame retardant effectiveness while eliminating the harmful environmental effects associated with halogenated substances, aligning with environmental protection requirements
3Reliability
If carbon-based fillers are added to achieve electromagnetic shielding performance, then shielding effectiveness is improved, but the complexity of the resin composition increases
Solution Approach 1:
The silane-modified polyethylene wax serves multiple functions: it acts as a migration inhibitor for flame retardants, improves the dispersion of carbon-based fillers in the resin matrix, and enhances the overall processability of the composition. This multi-functionality reduces the need for additional separate additives, thereby managing composition complexity while maintaining shielding performance
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 achieves stable electromagnetic shielding with a V-0 grade flame retardancy and electromagnetic shielding performance of 30 dB or more, even under harsh environmental conditions, making it suitable for automotive parts.
Implementation Method 1
5 to 40 parts by weight of a carbon-based filler
Implementation Method 2
carbon-based filler
Implementation Method 3
0.1 to 5 parts by weight of an anti-blooming agent... inhibiting flame retardant migration
Data Source
AI summary
The electromagnetic shielding resin composition includes: 5 to 40 parts by weight of a carbon-based filer, 10 to 30 parts by weight of a non-halogenated flame retardant, and 0.1 to 5 parts by weight of an anti-blooming agent based on 100 parts by weight of a polyamide resin.