Crystalline Polyamide Resin Composition Sliding Durability
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Solution Overview
Problem
Existing polyamide resin compositions face challenges in achieving high mechanical strength and sliding durability while maintaining low specific gravity, as high viscosity polyamides require significant amounts of solid lubricants, which reduce tensile strength, or liquid lubricants, which can compromise compatibility and surface quality.
Innovation Solution
A crystalline polyamide resin composition is developed, combining specific amounts of high relative viscosity crystalline polyamide resin, modified polyolefin resin with reactive functional groups, carbon fiber, and styrene-glycidyl methacrylate copolymer to enhance mechanical strength and sliding characteristics without increasing specific gravity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyamide resin of high viscosity is used to improve sliding characteristics, then sliding durability is improved, but deformation upon loading increases and elastic modulus decreases
Solution Approach 1:
The patent uses a composite material system combining high-viscosity polyamide resin with carbon fiber and modified polyolefin resin. The carbon fiber provides reinforcement to increase elastic modulus and reduce deformation, while the modified polyolefin resin acts as a coupling agent to ensure good interfacial adhesion between the fiber and matrix, thus resolving the contradiction between sliding durability and mechanical strength.
Solution Approach 2:
The patent changes the physical and chemical parameters of the resin system by selecting polyamide resin with specific relative viscosity (3.0 or more) and incorporating modifiers. This parameter optimization allows achieving high sliding durability while maintaining adequate mechanical properties through the synergistic effect of the composite formulation.
2Strength
If inorganic filler is added to increase elastic modulus, then deformation upon loading is reduced, but fluidity deteriorates and specific gravity increases
Solution Approach 1:
Instead of using traditional inorganic fillers that affect overall fluidity, the patent employs carbon fiber which provides localized reinforcement. The fiber's high aspect ratio allows it to enhance elastic modulus with minimal volume fraction, preserving the resin's fluidity and avoiding significant increase in specific gravity.
Solution Approach 2:
The patent optimizes the viscosity parameter of the polyamide resin (relative viscosity of 3.0 or more) and controls the composition ratios of additives to maintain appropriate fluidity for molding while achieving the required elastic modulus through the carbon fiber reinforcement mechanism.
3Reliability
If solid lubricant is compounded in large amount to improve sliding characteristics, then sliding durability is improved, but tensile strength is significantly lowered
Solution Approach 1:
The patent extracts or eliminates the need for large amounts of solid lubricant by using high-viscosity polyamide resin itself as the primary sliding durability enhancer. The resin's inherent molecular structure and viscosity provide excellent sliding characteristics without requiring excessive lubricant addition, thus preserving tensile strength.
Solution Approach 2:
The composite formulation uses carbon fiber and modified polyolefin resin to enhance both mechanical strength and sliding durability simultaneously. This composite approach replaces the traditional strategy of adding large amounts of solid lubricant, achieving sliding durability improvement without sacrificing tensile strength.
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 moldability, sliding durability, and light specific gravity, maintaining mechanical characteristics and resistance to deformation and chemicals, making it suitable for automotive parts like door checkers and gears.
Implementation Method 1
a modified polyolefin resin (C) having a reactive functional group capable of reacting with terminal group and/or main chain amide group of the polyamide resin
Implementation Method 2
0 to 5 part(s) by mass of a styrene-glycidyl methacrylate copolymer (E)
Data Source
AI summary
The present invention is a crystalline polyamide resin composition, comprising 100 parts by mass of a crystalline polyamide resin and 1 to 10 part(s) by mass of a modified polyolefin resin. The crystalline polyamide resin composition of the present invention can provide a molded product which has so excellent sliding durability that changes in surface appearance against repeated slidings for tens of thousands times with high load are small and which has excellent mechanical strength and moldability, while keeping excellent characteristics inherent to a crystalline polyamide resin.