Dust-Resistant POM Sliding Member Composition for Low-Noise Window Regulators
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Solution Overview
Problem
Existing polyacetal resin-based sliding members experience abnormal noise generation and reduced friction and wear resistance in environments with dust and moisture, particularly with small particle-sized dust, without compromising mechanical properties.
Innovation Solution
A resin composition comprising specific amounts of a lubricant, inorganic filler, modified olefin-based polymer, and alkylene glycol-based polymer is used, enhancing friction and wear resistance while suppressing abnormal noise generation, even in dusty conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a POM resin molded member is used for the sliding portion, then excellent sliding properties are achieved, but abnormal noise generation occurs and friction and wear resistance decrease in environments with dust and moisture
Solution Approach 1:
The patent uses a composite resin composition containing polyacetal resin as the base material, combined with specific additives including modified olefin polymer (1-20 parts), silane-modified polyethylene resin (0.1-5 parts), and lubricant (0.1-5 parts). This composite formulation maintains the excellent sliding properties of POM resin while adding dust-resistant characteristics through the synergistic effect of multiple components.
Solution Approach 2:
The patent modifies the resin composition parameters by controlling the content of oxyalkylene units (except oxymethylene units) at 0.1-5.0 mol% relative to all structural units, and by specifying precise amounts of each additive component. These parameter changes optimize the balance between sliding properties and dust-resistant performance.
2Reliability
If different materials are used for the sliding portion and remaining portions, then friction and wear resistance is improved, but assembly workload and costs increase
Solution Approach 1:
The patent creates a universal resin composition that can be used for the entire window regulator mechanism, including both sliding portions and structural portions. The composite formulation provides both excellent sliding properties and dust-resistant performance in a single material, eliminating the need for differentiating between sliding portion materials and standard POM resin.
3Strength
If the carrier plate requires excellent mechanical properties to support the door glass, then tensile strength is maintained, but friction and wear resistance must be improved without impairing mechanical properties
Solution Approach 1:
The patent formulates a composite resin composition that combines polyacetal resin with modified olefin polymer, silane-modified polyethylene resin, and lubricant. This composite structure maintains the high tensile strength required for carrier plate support while providing enhanced friction and wear resistance through the lubricant and modified polymer components.
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 resin composition achieves excellent friction and wear resistance with minimal abnormal noise, maintaining mechanical properties despite the presence of dust and moisture, regardless of particle size.
Implementation Method 1
0.5 to 5.0 parts by mass of a lubricant (B) that is liquid at 25°C
Implementation Method 2
0.1 to 30 parts by mass of an inorganic filler (C)
Data Source
AI summary
A method for producing a dust-resistant sliding member, the method including a step of preparing a resin composition containing 0.5 to 5.0 parts by mass of a specific lubricant that is liquid at 25°C, 0.1 to 30 parts by mass of an inorganic filler, 1.0 to 20 parts by mass of a specific modified olefin-based polymer, and 0.01 to 5.0 parts by mass of an alkylene glycol-based polymer having a primary or secondary amino group, per 100 parts by mass of a polyacetal copolymer containing oxyalkylene units (except oxymethylene units) in a ratio of 0.4 to 0.9 mol% relative to all of the structural units; and a step of molding the resin composition into a prescribed shape.