Dispersed graphite filled carbon nano-polytetrafluoroethylene valve seal ring

Abstract

The invention discloses a dispersed graphite filled carbon nano-polytetrafluoroethylene valve seal ring. The seal ring is prepared from, by weight, 100 parts of polytetrafluoroethylene, 5-8 parts of carbon nano tubes, 8-10 parts of phenol, 8-10 parts of p-toluic acid, 1-2 parts of bentonite, 5-8 parts of diphenyl ether, 1-3 parts of butyl titanate, 20-25 parts of 60%-70% sodium hypochlorite, 20-25 parts of EDTA, 40-50 parts of ammonia water, 80-100 parts of absolute ethyl alcohol, 80-100 parts of 1%. sodium polyacrylate solution, 3-5 parts of graphite, 4-5 parts of 3% succinic acid solution, 1-2 parts of molybdenum disulfide, 1-3 parts of silane coupling agent kh550, 9-10 parts of ammonium chloride, 30-35 parts of urea and 30-35 parts of water. The seal ring is good in abrasion resistance, has a low friction coefficient and dry grinding abrasion, a good sealing property and high resistance to permeability and abrasion resistance and is long in service life.

Description

technical field [0001] The invention belongs to the field of valve sealing rings, and in particular relates to a dispersed graphite-filled polytetrafluoroethylene valve sealing ring and a preparation method and application thereof. Background technique [0002] Polytetrafluoroethylene (PTFE) is characterized by its high chemical stability, strong high and low temperature resistance, outstanding non-stickiness, good lubricity, excellent electrical insulation, aging resistance, minimal water absorption, etc. , making it widely used in aerospace, petrochemical, mechanical industry, electronic appliances, food industry, textile and other fields. However, due to its poor mechanical properties, large linear expansion coefficient, poor creep resistance, poor wear resistance, low hardness, and difficulties in forming and secondary processing, its application range is limited to a certain extent. In order to improve and overcome the defects of pure PTFE, surface modification, fillin...

AI Technical Summary

Problems solved by technology

[0002] Polytetrafluoroethylene (PTFE) is characterized by its high chemical stability, strong high and low temperature resistance, outstanding non-stickiness, good lubricity, excellent electrical insulation, aging resistance, minimal water absorption, etc. , making it widely used in aerospace, petrochemical, mechanical industry, electronic appliances, food industry, textile and other fields. However, due to its poor mechanical properties, large linear expansion coefficient, poor creep resistance, poor wear resistance, low hardness, and difficulties in forming and secondary processing, its application range is limited to a certain extent.