Anti-aging carbon nanotube-polytetrafluoroethylene valve sealing ring
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A polytetrafluoroethylene and valve sealing technology, which is applied in the field of valve sealing rings, can solve the problems of low strength and hardness, easy aging, etc., and achieve the effects of improved service life, not easy to aging, and excellent wear resistance
Inactive Publication Date: 2017-02-15
ANHUI RONGDA VALVE
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Although carbon nanotube-reinforced PTFE composites have improved wear resistance, they are prone to aging and have low strength and hardness.
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[0019] An anti-aging carbon nano-polytetrafluoroethylene valve sealing ring, prepared from the following components in parts by weight: 100 parts of polytetrafluoroethylene, 8 parts of carbon nanotubes, 3 parts of isosorbide, and dimethyl oxalate 2 parts, bisphenol A 3 parts, MoO 3 / TiO 2 -SiO 2 0.3 parts of catalyst, 25 parts of 60-70% sodium hypochlorite, 25 parts of EDTA, 50 parts of ammonia water, 100 parts of absolute ethanol, 3 parts of barium sulfate, 1 part of molybdenum disulfide, 3 parts of silane coupling agent kh550, 10 parts of ammonium chloride , urea 30 parts, water 30 parts.
[0020] An anti-aging carbon nano-polytetrafluoroethylene valve sealing ring is prepared by the following steps:
[0021] (1) Activation of carbon nanotubes
[0022] A Oxidation of carbon nanotubes
[0023] Disperse molybdenum disulfide in 60% sodium hypochlorite solution first, then add carbon nanotubes and stir for 12 hours, filter with suction, put the filter cake in absolute ethan...
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Abstract
The invention discloses an anti-aging carbon nanotube-polytetrafluoroethylene valve sealing ring. The anti-aging carbon nanotube-polytetrafluoroethylene valve sealing ring is prepared from the following components by weight: 100 parts of polytetrafluoroethylene, 5 to 8 parts of carbon nanotubes, 3 to 4 parts of sorbitol, 2 to 3 parts of dimethyl oxalate, 3 to 4 parts of bisphenol A, 0.1 to 0.5 part of a MoO3 / TiO2-SiO2 catalyst, 20 to 25 parts of sodium hypochlorite with a concentration of 60 to 70%, 20 to 25 parts of EDTA, 40 to 50 parts of ammonia water, 80 to 100 parts of absolute ethyl alcohol, 3 to 5 parts of barium sulfate, 1 to 2 parts of molybdenum disulfide, 1 to 3 parts of a silane coupling agent KH550, 9 to 10 parts of ammonium chloride, 30 to 35 parts of urea and 30 to 35 parts of water. The anti-aging carbon nanotube-polytetrafluoroethylene valve sealing ring disclosed in the invention has aging resistance, wear resistance and long service life.
Description
technical field [0001] The invention belongs to the field of valve sealing rings, and in particular relates to an anti-aging carbon nanotube-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 mo...
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