Polyamide Resin Composition Crosslinking Toughness Strain Balance
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Solution Overview
Problem
Existing polyamide resin compositions fail to balance high toughness and high breaking strain effectively, as previously proposed solutions degrade other performance metrics.
Innovation Solution
A polyamide resin composition comprising 100 parts by weight of polyamide resin A, derived from metaxylylene sebacamide with specific structural units and terminal amino group concentrations, combined with 0.05 to 0.45 parts by weight of olefin-maleic anhydride copolymer B, achieving a balanced high toughness and high breaking strain through crosslinked structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If elastomer is added to improve toughness of MXD6, then toughness is improved, but other performances are degraded
Solution Approach 1:
The patent uses maleic anhydride-grafted polyethylene as an intermediary substance that reacts with terminal amino groups of the polyamide resin to form crosslinked structures. This mediator enables toughness improvement through crosslinking without introducing elastomers that would compromise other performance characteristics.
Solution Approach 2:
The patent changes the chemical parameter by controlling the terminal amino group concentration within 10-30 μeq/g and using specific amounts of maleic anhydride-grafted polyethylene (0.05-0.45 parts by weight per 100 parts by weight of polyamide resin) to achieve optimal crosslinking density that improves toughness while maintaining other performances.
2Stress or pressure
If high rigidity is achieved using MXD6, then rigidity is improved, but toughness is reduced
Solution Approach 1:
The patent creates a composite structure by forming crosslinked networks within the polyamide resin matrix through reaction between terminal amino groups and maleic anhydride groups. This composite approach combines the high rigidity of the polyamide base resin with the toughness enhancement from crosslinked structures.
Solution Approach 2:
The patent changes the structural parameter by controlling crosslinking density through precise control of terminal amino group concentration (10-30 μeq/g) and additive content, achieving a balance between rigidity and toughness without compromising the inherent high rigidity of MXD6.
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 high elastic modulus and breaking strain simultaneously, improving mechanical characteristics and moldability while maintaining stability during processing.
Implementation Method 1
the maleic anhydride moiety of the olefin-maleic anhydride copolymer (B) reacts with the terminal amino group of the polyamide resin (A), to form a crosslinked structure between the olefin-maleic anhydride copolymer (B) and the polyamide resin (A)
Data Source
AI summary
Provided is a polyamide resin composition capable of achieving high toughness and high breaking strain at the same time. Also provided is a molded article produced by molding the polyamide resin composition, and a method for manufacturing the molded article using the polyamide resin composition. A polyamide resin composition comprising: 100 parts by weight of polyamide resin (A) that is composed of a structural unit derived from diamine and a structural unit derived from dicarboxylic acid, and 0. 05 to 0.45 parts by weight of an olefin-maleic anhydride copolymer (B), wherein 50 mol % or more of the structural unit derived from diamine is derived from at least one of metaxylylenediamine and paraxylylenediamine; the molar ratio of the structural unit derived from metaxylylenediamine and the structural unit derived from paraxylylenediamine is 100 : 0 to 40:60; 50 mol % or more of the structural unit derived from dicarboxylic acid is derived from sebacic acid; and the polyamide resin (A) has a terminal amino group concentration of 10 to 30 µeq/g.