Fluororubber Sealing Ring With Embedded Resin for Low-Friction Sliding
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Solution Overview
Problem
Fluorine rubber, despite its excellent heat resistance and chemical resistance, has high lubricity with general lubricants, making it difficult to improve slidability using conventional methods, and lubricants peel off easily, preventing effective sealing and sliding performance.
Innovation Solution
A sealing member composed of 100 parts by weight of fluorine rubber and 0.5 to 50 parts by weight of a particulate resin, where the resin includes a compatible portion for compatibility with fluorine rubber and a lubrication portion for improved slidability, with a Shore A hardness of at least 80 on the sliding surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorine rubber is used for sealing members, then heat resistance and chemical resistance are improved, but slidability deteriorates due to high lubricity with general lubricants
Solution Approach 1:
The invention uses a composite material system consisting of fluorine rubber as the base material and particulate resin (containing PTFE and/or polyethylene) as the lubricating component. This composite structure allows the fluorine rubber to maintain its excellent heat and chemical resistance while the particulate resin provides the necessary slidability. The particulate resin is incorporated at 1-50 parts by weight per 100 parts of fluorine rubber, creating a multi-functional material that resolves the contradiction between reliability and ease of operation.
2Ease of operation
If lubricant is coated on fluorine rubber surface, then slidability is improved, but lubricant retention deteriorates due to peeling off
Solution Approach 1:
The invention employs a solid particulate resin (PTFE and/or polyethylene) that acts as a self-replenishing lubricant. Unlike liquid lubricants that peel off, the particulate resin remains embedded in the fluorine rubber matrix and continuously provides lubrication during sliding. The particulate resin particles are distributed throughout the rubber and on the surface, ensuring long-term slidability without the retention issues of coated lubricants.
3Ease of operation
If sufficient amount of lubricant is dispersed in fluorine rubber, then slidability is improved, but dispersion difficulty increases
Solution Approach 1:
The invention specifies precise parameter ranges for the particulate resin content (1-50 parts by weight per 100 parts of fluorine rubber) to optimize both slidability and manufacturability. Within this range, the particulate resin can be effectively dispersed in the fluorine rubber using conventional mixing equipment. The Shore A hardness is controlled at 70-90 to ensure proper dispersion and processing characteristics while maintaining the lubricating effect.
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 sealing member achieves both sealing and slidability by ensuring the resin remains on the surface, providing durable and long-lasting lubrication, even when the sliding surface is worn.
Implementation Method 1
rubber is capable of ensuring a sealing property by its own rubber elasticity (repulsive force)
Implementation Method 2
the lubrication portion of the particulate resin... it is possible to impart high slidability to the sealing member
Data Source
Figure 1~2
Figure 3A~3C
Figure 4
AI summary
[Object] To provide a ring-shaped sealing member having both the sealing property and slidability. [Solving Means] A sealing member is formed in a ring shape and has a sliding surface. The sealing member includes: 100 parts by weight of fluorine rubber; and 0.5 to 50 (inclusive) parts by weight of a particulate resin. The particulate resin includes a compatible portion and a lubrication portion, the compatible portion having compatibility with the fluorine rubber, the lubrication portion having lubricity with respect to the fluorine rubber. A Shore A hardness measured using the sliding surface as a pressing surface is not less than 80. In this sealing member, since rubber elasticity is achieved by the fluorine rubber, a favorable sealing property can be realized. Further, it is possible to impart high slidability to the sealing member by the action of the lubrication portion of the particulate resin. Therefore, this sealing member has both the sealing property and slidability.