Nano calcium carbonate modified polytetrafluoroethylene composite material for sealing valve

Abstract

The invention discloses a nano calcium carbonate modified polytetrafluoroethylene composite material for sealing a valve and relates to the technical field of valve sealing materials. The nano calcium carbonate modified polytetrafluoroethylene composite material is prepared from the following raw materials in parts by weight: 75-80 parts of polytetrafluoroethylene, 15-20 parts of nano calcium carbonate, 12-16 parts of sodium carboxymethylcellulose, 10-13 parts of glycerol, 8-10 parts of linear phenolic resin, 5-8 parts of bentonite, 5-8 parts of talc powder, 3-5 parts of phosphite ester, 3-5 parts of dibutyl phthalate, 3-4 parts of phenyl salicylate, 2-3 parts of graphite powder, 2-3 parts of stearic acid, 1-2 parts of polyester and 1-2 parts of agar. According to the nano calcium carbonate modified polytetrafluoroethylene composite material disclosed by the invention, nano calcium carbonate modified polytetrafluoroethylene is adopted, an appropriate amount of an auxiliary agent is added, the prepared composite material has the characteristics of good plasticity, high-temperature resistance, ageing resistance and corrosion resistance, can be processed into various shapes and is low in friction coefficient, and the use temperature is -136-420 DEG C, so that the composite material can be used as a sealing material to improve the sealing performance of the valve.

Description

Technical field: [0001] The invention relates to the technical field of valve sealing materials, in particular to a nano calcium carbonate modified polytetrafluoroethylene composite material for valve sealing. Background technique: [0002] At present, the non-metallic sealing materials commonly used in valves are pure polytetrafluoroethylene (PTFE), reinforced polytetrafluoroethylene (RTFE) and other fluoroplastics or flexible graphite. Ordinary fluoroplastics have good plasticity, can be processed into various shapes, and have a low friction coefficient, but they have the disadvantage of not being resistant to high temperatures, and their operating temperature is -40°C-160°C; although flexible graphite can withstand high temperatures, the operating temperature is -196 ℃-600℃, its plasticity is poor, and it can only be processed into a sheet or rectangular ring structure, and the coefficient of friction is relatively high. [0003] In recent years, there have been more and...

AI Technical Summary

Problems solved by technology

Ordinary fluoroplastics have good plasticity, can be processed into various shapes, and have a low friction coefficient, but they have the disadvantage of not being resistant to high temperatures, and their operating temperature is -40°C-160°C; although flexible graphite can withstand high temperatures, the operating temperature is -196 ℃-600℃, its plasticity is poor, it can only be processed into a sheet or rectangular ring structure, an