Polyamide Resin Composition Wear Resistance Mechanical Strength
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Solution Overview
Problem
Polyamide resin compositions used in sliding parts often face a trade-off between wear resistance and mechanical strength, where excellent wear resistance may come at the cost of poor mechanical strength, or vice versa.
Innovation Solution
A polyamide resin composition incorporating 1,4-bis(aminomethyl)cyclohexane and α,ω-linear aliphatic dicarboxylic acid with a specific molar ratio of cis:trans and the inclusion of phosphorus and calcium atoms, combined with an inorganic filler, to enhance wear resistance while maintaining high mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyamide resin composition with sliding modifiers is used to improve wear resistance, then wear resistance is improved, but mechanical strength deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the polyamide resin by incorporating specific cyclic carbamate structures and controlling the molar ratio of diamine to dicarboxylic acid components. This parameter optimization allows the resin to achieve both excellent wear resistance and high mechanical strength simultaneously, resolving the trade-off between these two properties
Solution Approach 2:
The invention creates a composite polyamide resin system by combining multiple components: polyamide base resin, cyclic carbamate structures (specific isomers), and inorganic fillers. This composite approach enables the material to exhibit both superior wear resistance and maintained mechanical strength, overcoming the limitations of single-component systems
2Reliability
If sliding modifiers are added to polyamide resin to enhance wear resistance, then wear resistance is improved, but the resin composition complexity increases
Solution Approach 1:
The invention merges the functions of multiple additives into a single integrated molecular structure by incorporating cyclic carbamate groups directly into the polyamide resin chain. This eliminates the need for separate sliding modifier additives, simplifying the overall composition while maintaining excellent wear resistance
Solution Approach 2:
The invention optimizes the molar ratio parameters of the resin components (diamine to dicarboxylic acid ratio controlled at 1.05:1 to 1.2:1) to achieve desired performance without requiring complex multi-component formulations, thus reducing composition complexity while maintaining wear resistance
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 excellent wear resistance and high mechanical strength in molded articles, as demonstrated by improved crystallinity, thermal properties, and specific wear rate, with the use of calcium hypophosphite as an antioxidant improving the appearance and stability of the resin.
Implementation Method 1
the polyamide resin includes 1,4-bis(aminomethyl)cyclohexane and an α,ω-linear aliphatic dicarboxylic acid having from 8 to 12 carbons; a molar ratio of cis:trans of the 1,4-bis(aminomethyl)cyclohexane is from 35:65 to 0:100
Implementation Method 2
with the use of calcium hypophosphite as an antioxidant improving the appearance and stability of the resin
Data Source
AI summary
Provided is a polyamide resin composition capable of providing a molded article having an excellent wear resistance while maintaining a high mechanical strength; a molded article; and a method for manufacturing a polyamide resin pellet. The polyamide resin composition includes a polyamide resin and an inorganic filler, wherein the polyamide resin includes diamine-derived constituent units and dicarboxylic acid derived constituent units; 70 mol% or more of the diamine-derived constituent units are derived from 1,4-bis(aminomethyl)cyclohexane; a molar ratio of cis:trans of the 1,4-bis(aminomethyl)cyclohexane is from 35:65 to 0:100; 70 mol% or more of the dicarboxylic acid-derived constituent units are derived from an α,ω-linear aliphatic dicarboxylic acid having from 8 to 12 carbons; and the polyamide resin includes phosphorus atoms in a ratio of from 20 to 100 mass ppm and comprises calcium atoms so as to be phosphorus atoms:calcium atoms of 1:0.3 to 0.7 in a molar ratio.