PPS Sliding Member Composition for Low-Wear Metal Contact
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Solution Overview
Problem
Polyphenylene sulfide resins used in sliding members suffer from inadequate toughness, self-lubrication properties, and wear resistance, particularly when used with stainless steel or soft metal counterparts, leading to abrasive wear and surface roughness issues under high load conditions.
Innovation Solution
A resin composition comprising 40-80% polyphenylene sulfide resin, 15-40% polytetrafluoroethylene resin, 2-20% ultra-high molecular weight polyethylene resin, 0.1-5% modified polyolefin resin, and 0.5-5% amorphous polymer, with optional additives like phosphates, carbonates, or sulfates, to enhance sliding properties and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforcing fillers such as glass fiber or carbon fiber are added to polyphenylene sulfide resin to improve mechanical strength, then mechanical strength is improved, but the reinforcing filler may damage the counterpart during sliding and cause abrasive wear
Solution Approach 1:
The patent uses a composite material system consisting of polyphenylene sulfide resin, polytetrafluoroethylene resin, and ultra-high molecular weight polyethylene resin. This composite provides both the mechanical strength needed for structural integrity and the self-lubricating properties that prevent abrasive wear of counterpart surfaces, eliminating the need for traditional reinforcing fillers like glass fiber or carbon fiber.
Solution Approach 2:
The patent changes the material composition parameters by incorporating specific ratios of polytetrafluoroethylene resin (10-30 mass%) and ultra-high molecular weight polyethylene resin (5-20 mass%) into the polyphenylene sulfide resin matrix. This parameter modification transforms the material properties to achieve both high strength and low friction coefficients, preventing counterface damage while maintaining structural requirements.
2Reliability
If polyphenylene sulfide resin is used as a sliding member to maintain heat resistance and chemical resistance, then heat resistance and chemical resistance are maintained, but toughness and self-lubrication properties are insufficient
Solution Approach 1:
The patent merges multiple resin materials with complementary properties into a single composite system. Polyphenylene sulfide resin provides heat and chemical resistance, while polytetrafluoroethylene resin and ultra-high molecular weight polyethylene resin contribute self-lubrication properties and improved toughness. This combination achieves all required properties simultaneously without sacrificing any single characteristic.
Solution Approach 2:
The patent creates a composite material system where polyphenylene sulfide resin serves as the base matrix maintaining thermal and chemical stability, while incorporated polytetrafluoroethylene and ultra-high molecular weight polyethylene phases provide enhanced self-lubrication and toughness. The synergistic interaction between these materials resolves the contradiction between maintaining reliability under harsh conditions and achieving adequate self-lubrication properties.
3Ease of operation
If a large amount of high molecular weight polytetrafluoroethylene resin is compounded to improve sliding properties, then lubrication properties are improved, but the resin aggregates and causes defective appearance and surface roughening
Solution Approach 1:
The patent applies local quality by distributing polytetrafluoroethylene resin and ultra-high molecular weight polyethylene resin as dispersed phases within the polyphenylene sulfide resin matrix rather than using large continuous amounts. This localized distribution of lubricating components provides adequate self-lubrication properties while preventing aggregation that would cause surface defects, achieving both good lubrication and smooth surface finish.
Solution Approach 2:
The patent optimizes the concentration parameters of polytetrafluoroethylene resin (10-30 mass%) and ultra-high molecular weight polyethylene resin (5-20 mass%) to achieve sufficient lubrication properties without excessive amounts that would cause aggregation. This parameter optimization ensures adequate self-lubrication while maintaining manufacturing precision and preventing surface roughening during processing.
4Ease of manufacture
If polyphenylene sulfide resin is used to maintain moldability, then moldability is maintained, but toughness is low and abnormal wear occurs when counterpart has high surface roughness
Solution Approach 1:
The patent employs a composite material system where polyphenylene sulfide resin maintains excellent moldability as the continuous matrix phase, while incorporated polytetrafluoroethylene resin and ultra-high molecular weight polyethylene resin enhance toughness and impact resistance. This composite structure allows the material to be easily molded while simultaneously providing the toughness needed to resist abnormal wear when sliding against rough-surfaced counterparts.
Solution Approach 2:
The patent modifies the material composition parameters by incorporating ultra-high molecular weight polyethylene resin (5-20 mass%) which significantly improves toughness and impact strength while maintaining the moldability characteristics of the polyphenylene sulfide base resin. This parameter change enables the material to withstand rough sliding conditions without sacrificing ease of manufacture.
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 improves lubrication properties, wear resistance, and mechanical strength, reducing friction and wear while maintaining excellent heat and chemical resistance, and preventing surface defects during processing.
Implementation Method 1
polyphenylene sulfide resins themselves are inferior in toughness with low elongation and have insufficient self-lubrication properties
Implementation Method 2
2 to 20 mass% of an ultra-high molecular weight polyethylene resin
Data Source
AI summary
A resin composition for sliding member according to the present invention contains 40 to 80 mass% of a polyphenylene sulfide resin and as an additive, 15 to 40 mass% of a polytetrafluoroethylene resin, 2 to 20 mass% of an ultra-high molecular weight polyethylene resin, 0.1 to 5 mass% of a modified polyolefin resin, and 0.5 to 5 mass% of an amorphous polymer.