Low-Phosphorus Polyamide Compound for Flame Retardancy and Low Migration
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Solution Overview
Problem
Existing polyamide moulding compounds face challenges in achieving good flame retardancy with low phosphorus content, high elongation at break, and minimal loss of mass due to migration, especially when exposed to high temperatures, while maintaining mechanical integrity and adhesion to metallic surfaces.
Innovation Solution
A polyamide moulding compound comprising a polyamide matrix with a flame retardant composition that includes metal-free aryl phosphate, aryl phosphonate, carbohydrate polyol, and melamine cyanurate, with a phosphorus content of 0.5% to 1.5% by weight, which provides excellent flame retardancy, low migration, and high elongation at break.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional flame retardants with high phosphorus content are used, then flame retardancy is improved, but loss of mass due to migration increases
Solution Approach 1:
The patent changes the chemical parameters of the flame retardant system by using metal-free aryl phosphates and aryl phosphonates with specific molecular structures, achieving effective flame retardancy at low phosphorus content (0.5-1.5% P) while minimizing migration and mass loss
Solution Approach 2:
The patent creates a composite flame retardant system combining multiple components (metal-free aryl phosphate, aryl phosphonate, carbohydrate polyol, and melamine cyanurate) that work synergistically to provide flame retardancy with minimal migration, resolving the contradiction between effectiveness and stability
2Loss of substance
If phosphorus content is reduced, then loss of mass due to migration is reduced, but flame retardancy deteriorates
Solution Approach 1:
The patent optimizes the phosphorus content parameter to a specific range (0.5-1.5% by weight) and changes the chemical nature of phosphorus compounds to metal-free aryl phosphates and phosphonates, achieving both low migration and effective flame retardancy simultaneously
Solution Approach 2:
The patent introduces melamine cyanurate and carbohydrate polyols as intermediary substances that enhance the effectiveness of low-phosphorus flame retardants, allowing adequate flame protection at reduced phosphorus levels with minimal migration
3Loss of substance
If flame retardant composition is optimized for low phosphorus content, then loss of mass due to migration is reduced, but mechanical properties (elongation at break) may deteriorate
Solution Approach 1:
The patent carefully controls the phosphorus content parameter within 0.5-1.5% and selects specific chemical structures (metal-free aryl phosphates and phosphonates) that provide flame retardancy while maintaining polymer chain flexibility and mechanical integrity
Solution Approach 2:
The patent uses small amounts of specifically designed flame retardant molecules that remain stable and effective without degrading the polymer matrix, achieving protection with minimal impact on mechanical properties
Data Source
AI summary
A flame-retardant polyamide molding compound may have low phosphorus content. Such a polyamide molding compound may include (A) a polyamide matrix including polyamide(s) having at least 8 carbon atoms per amide unit; (B) a flame retardant composition comprising (B1) metal-free aryl phosphate(s), (B2) aryl phosphonate(s), (B3) carbohydrate polyol(s), (B4) melamine cyanurate(s), and (B5) optionally, non-phosphorus-comprising flame retardant(s). A total phosphorus content from the flame retardant composition may be in a range of from 0.5 to 1.5 wt. %, based on total polyamide molding compound weight