Carbon nanotube-polytetrafluoroethylene valve sealing ring filled with modified mullite powder

Abstract

The invention discloses a carbon nanotube-polytetrafluoroethylene valve sealing ring filled with modified mullite powder. The valve sealing ring is prepared from the following components: polytetrafluoroethylene, polyphenylene sulfide, carbon nanotubes, phenol, p-toluylic acid, bentonite, diphenyl ether, butyl titanate, sodium hypochlorite with a concentration of 60 to 70%, EDTA, ammonia water, absolute ethyl alcohol, mullite, hydrogen peroxide with a concentration of 10 to 15%, deionized water, 2,4,6-trisphenol, ethyl alpha-cyanoacrylate, a cross-linking agent TAC, molybdenum disulfide, a silane coupling agent KH550, ammonium chloride, urea and water. The sealing ring provided by the invention has good sealing performance, high hardness, small thermal expansion coefficient, high refractoriness, stable thermo-chemical performance and other excellent performance.

Description

technical field [0001] The invention belongs to the field of valve sealing rings, and in particular relates to a modified mullite powder filled polytetrafluoroethylene valve sealing ring and its preparation method and application. 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, filling...

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.