Rubber-polytetrafluoroethylene compounded sealing ring

Abstract

The invention relates to a rubber-polytetrafluoroethylene compounded sealing ring which comprises a ring-shaped body, wherein the ring-shaped body is a silicon rubber ring-shaped body or a fluororubber ring-shaped body. The sealing ring is characterized in that a polytetrafluoroethylene felt pad is wrapped outside the ring-shaped body. The compounded sealing ring can be used for comprehensively improving the mechanical property and the chemical stability of a rubber sealing ring as well as the wear resistance and the medium corrosion resistance of a compounded sealing ring, enhancing the corrosion resistance, the adhesion resistance and the sealing rebound resilience of rubber, increasing the oil resistivity on the surface of the rubber, obviously improving the high-temperature and low-temperature resistance of the surface of the rubber, obviously reducing the friction consumption, keeping the physical mechanical property of the rubber unchanged and also improving the strength and the hardness of the rubber. In addition, the invention also ensures that the using range of the rubber sealing ring is further expanded, and moreover, the service life of the rubber sealing ring coated with the polytetrafluoroethylene felt pad is obviously prolonged by 5-6 times. The rubber-polytetrafluoroethylene compounded sealing ring is suitable for equipment of pipeline systems in the chemical industry, and the like.

Description

Technical field: [0001] The invention relates to a rubber sealing ring, in particular to a rubber-polytetrafluoroethylene composite sealing ring. Background technique: [0002] Sealing rings are used in the joints of pipes and equipment in pipeline process systems such as the chemical industry. The requirements for the materials of these sealing rings are good heat resistance and low temperature resistance, good resistance to medium corrosion, dissolution and aging, and good elasticity. The friction coefficient is small and durable. Grinding, etc., the material of the sealing ring should have good mechanical strength, no deformation when encountering oil and water, and small residual deformation after compression and long-term use. The commonly used sealing ring material is rubber, and the sealing effect of the rubber sealing ring is Well, the most widely used, usually used are silicone rubber seals and fluorine rubber seals. [0003] The working temperature of the silicone...

AI Technical Summary

Problems solved by technology

[0003] The working temperature of the silicone rubber sealing ring is -60°C to +250°C, and it can be used for a long time at 150-180°C. The silicone rubber sealing ring has good cold resistance and can be used at a temperature of -60°C or lower. The rubber sealing ring is resistant to high temperature and low temperature. It is currently a good cold-resistant and high-temperature resistant rubber sealing ring. At the same time, it has high stability to thermal oxidation and ozone, and is also resistant to atmospheric aging. Non-toxic and tasteless, but the tensile strength, tear strength and wear resistance of silicone rubber sealing rings are poor, and their physical and mechanical properties are not as good as most synthetic rubber sealing rings at room temperature. Strong acids, alkalis and organic solvents have poor chemical stability such as corrosion resistance and oil resistance. In addition, the service life of silicone rubber sealing rings will gradually shorten as the temperature rises. Therefore, silicone rubber sealing rings are not suitable for ordinary conditions. But it is very suitable for many specific purposes, such as sealing for high and low temperature resistance

[0004] Fluorine rubber sealing rings are generally used in a temperature range of -30°C to +250°C. They are characterized by acid and alkali resistance, and oil resistance is the best among oil-resistant rubber sealing rings. Mechanical properties, chemical corrosion resistance, ozone resistance, and atmospheric aging resistance Excellent performance, resistant to most oils and solvents, especially acids, aliphatic hydrocarbons, aromatic hydrocarbons and animal and vegetable oil media, etc. The disadvantages are poor cold resistance, low elasticity, and not suitable for ketones , low molecular weight esters and mixtures containing nitrate

[0005] The performance of the rubber sealing ring has a great influence on the sealing and performance of the entire pipeline system. However, materials such as silicone rubber sealing rings or fluororubber sealing rings have physical and chemical stability, high and low temperature resistance, and strength. There are still defects in the field, and it is difficult to meet the use requirements in the environment where the harsh temperature, pressure and chemical media coexist, so it will cause various problems such as leakage and unreliability in use, shorten the maintenance period, and bring maintenance problems. A lot of trouble, but also limited by a certain range in use

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