Polyphenylene Ether Resin for Hard Disk Drive Inner Parts
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Solution Overview
Problem
Hard disk drive inner parts require materials that balance low outgassing properties, ultrasonic cleaning resistance, low ionic and particulate contamination, repeated removability, heat resistance, specific gravity, and water-absorbing properties, which existing resins such as polyoxymethylene and polyphenylene sulfide fail to achieve effectively.
Innovation Solution
A resin composition comprising a polyphenylene ether resin with an aromatic vinyl polymer content of less than 70 parts by mass, residual volatile components below 3000 ppm, and a combination with a liquid crystal polyester and a compound containing Zn or Mg, processed using a specific extrusion method to achieve the desired properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If polyoxymethylene resin or polyphenylene sulfide resin is used for hard disk drive inner parts, then sliding properties with metal are improved, but low outgassing properties are insufficient
Solution Approach 1:
The patent changes the material parameters by selecting specific resin types (polyphenylene ether, polyacetal, polyphenylene sulfide) and controlling their composition ratios, molecular weight, and crystallinity to achieve both good sliding properties and low outgassing. The patent specifies particular parameter ranges for resin composition and processing conditions to optimize both properties simultaneously.
2Object-generated harmful factors
If polyetherimide, liquid crystal polyester, or polycarbonate is used for hard disk drive inner parts, then low outgassing properties are improved, but balance with cleanliness, cost, specific gravity, and water-absorbing properties is insufficient
Solution Approach 1:
The patent employs composite material strategies by combining multiple resin types (polyphenylene ether, polyacetal, polyphenylene sulfide) in specific ratios, and by adding inorganic fillers, lubricants, and other additives to create a composite formulation that achieves balanced performance across all required properties including outgassing, cleanliness, mechanical strength, and cost.
3Temperature
If alloying polyphenylene ether resin with liquid crystal polyester is done to improve heat resistance and mechanical properties, then heat resistance is improved, but information about outgassing properties is not provided
Solution Approach 1:
The patent specifies precise parameter ranges for the alloy composition, including the ratio of polyphenylene ether to liquid crystal polyester, molecular weight parameters, and processing conditions, to achieve both improved heat resistance and confirmed low outgassing properties through controlled material formulation.
Data Source
AI summary
A hard disk drive inner part formed of a resin which exhibits well-balanced low outgassing properties, ultrasonic cleaning resistance, low ionic contamination properties, low particulate contamination properties, repeated removability, heat resistance, specific gravity, and water-absorbing properties. The hard disk drive inner part includes a resin composition which includes a polyphenylene ether resin (A).