Sliding Contact Material for Moist Environments
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Solution Overview
Problem
Existing sliding contact components face challenges in maintaining friction-proof and wear-proof characteristics under dry frictional conditions, particularly under oscillating conditions, due to poor adhesiveness between synthetic fibers and resins, and issues with swelling in humid environments.
Innovation Solution
A sliding contact surface-forming material is developed using a reinforcing base woven with fluorine-containing resin fibers and polyester fibers, impregnated with a resol-type phenolic resin containing PTFE powder, which enhances adhesiveness and friction properties without the need for surface treatment of polyester fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If synthetic fiber fabrics (polyester, polyacrylonitrile) are used as reinforcing bases to reduce water absorptivity, then swelling is reduced, but adhesiveness to resin deteriorates
Solution Approach 1:
The invention changes the chemical parameters of the polyester fiber by controlling the ratio of carboxyl groups to hydroxyl groups (specifically achieving a carboxyl group content of 0.5-5.0 mmol/g). This parameter change in the fiber's functional group composition enables both low water absorptivity and high adhesiveness to phenolic resin without requiring surface treatments
Solution Approach 2:
The invention creates a composite material system consisting of modified polyester fiber (with specific carboxyl/hydroxyl group ratios) and phenolic resin. The modified fiber serves as both reinforcing base and adhesive promoter, forming a unified composite structure that simultaneously achieves dimensional stability and strong bonding
2Strength
If surface treatment is applied to polyester fiber to improve adhesiveness, then adhesiveness improves, but manufacturing complexity increases
Solution Approach 1:
The invention extracts and eliminates the separate surface treatment step from the manufacturing process. Instead of applying surface treatment as an additional process step, the adhesive functionality is built into the fiber itself through controlled chemical composition during fiber production, thereby simplifying the overall manufacturing process
Solution Approach 2:
The polyester fiber is designed to be self-adhesive through its inherent chemical composition (controlled carboxyl and hydroxyl group content). The fiber serves its own adhesive function without requiring external surface treatments or additional adhesive agents, eliminating complex preprocessing steps
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 solution provides improved friction-proof and wear-proof characteristics under dry conditions while maintaining low swelling, ensuring the multi-layered sliding contact component's applicability across various environments, including dry, grease-lubricating, and water-lubricating conditions.
Implementation Method 1
improved friction-proof and wear-proof characteristics
Implementation Method 2
enhances adhesiveness
Implementation Method 3
containing PTFE powder, which enhances adhesiveness and friction properties
Data Source
AI summary
A sliding contact surface-forming material, and method of making the material are disclosed, the material having minimal swelling and excellent friction-proof and wear-proof characteristics when used in moist environments such as in water, and improved in the friction-proof and wear-proof characteristics under dry friction conditions such as in the open air, particularly under oscillation conditions for testing journal. The material includes a reinforcing base impregnated with a resol-type phenolic resin having polytetrafluoroethylene resin dispersed therein. The reinforcing base is composed of a woven fabric formed by using, as each of the warp and the weft, a ply yarn which is formed by paralleling at least two strands of a single twist yarn spun from fluorine-containing resin fiber and a single twist yarn spun from polyester fiber, and by twisting them in the direction opposite to the direction in which the single twist yarns were spun.