Preparation method of polytetrafluoroethylene sheet for automobiles

A polytetrafluoroethylene, polytetrafluoroethylene micropowder technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of poor wear resistance, low strength, poor wear resistance and thermal stability, etc.

Inactive Publication Date: 2017-04-19
嘉科(安徽)密封技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PTFE has the defects of low mechanical strength, poor wear resistance and poor thermal stability. The existing PTFE oil seal mate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The preparation method of a kind of automobile oil seal polytetrafluoroethylene sheet that the present invention proposes comprises the following steps:

[0021] S1. Acidify carbon nanotubes to obtain acidified carbon nanotubes; add acryloyl chloride to dioxane, then add azobisisobutyronitrile solution in dioxane, feed nitrogen, and stir at 75°C for 30 hours, Then add acidified carbon nanotubes, adjust the temperature to 75° C., and then stir and react for 30 hours under the protection of nitrogen. After the reaction, the modified carbon nanotubes are obtained by suction filtration, washing, and drying; the polytetrafluoroethylene micropowder is subjected to argon plasma treatment, Then add glycidyl methacrylate and the dimethylformamide solution of modified carbon nanotubes, react at 95° C. for 25 hours, and obtain modified polytetrafluoroethylene micropowder by washing after the reaction;

[0022] S2. Add samarium oxide, molybdenum disulfide, aluminum trioxide, calciu...

Embodiment 2

[0026] The preparation method of a kind of automobile oil seal polytetrafluoroethylene sheet that the present invention proposes comprises the following steps:

[0027] S1. Acidifying carbon nanotubes to obtain acidified carbon nanotubes; adding acryloyl chloride to dioxane, then adding a dioxane solution of azobisisobutyronitrile, feeding nitrogen gas, stirring and reacting at 65° C. for 45 hours, Then add acidified carbon nanotubes, adjust the temperature to 65° C., and then stir and react for 45 hours under the protection of nitrogen. After the reaction, the modified carbon nanotubes are obtained by suction filtration, washing and drying; the polytetrafluoroethylene powder is subjected to argon plasma treatment, Then add glycidyl methacrylate and a dimethylformamide solution of modified carbon nanotubes, react at 85° C. for 30 hours, and wash to obtain modified polytetrafluoroethylene micropowder after the reaction;

[0028] S2. Add samarium oxide, molybdenum disulfide, alu...

Embodiment 3

[0032] The preparation method of a kind of automobile oil seal polytetrafluoroethylene sheet that the present invention proposes comprises the following steps:

[0033] S1. Acidifying carbon nanotubes to obtain acidified carbon nanotubes; adding acryloyl chloride to dioxane, then adding a dioxane solution of azobisisobutyronitrile, blowing nitrogen gas, and stirring and reacting at 72° C. for 36 hours, Then add acidified carbon nanotubes, wherein the weight ratio of acryloyl chloride to acidified carbon nanotubes is 20:1, adjust the temperature to 73°C, stir and react for 37h under the protection of nitrogen, and filter, wash and dry after the reaction to obtain improved carbon nanotubes; the polytetrafluoroethylene micropowder is subjected to argon plasma treatment, wherein, when carrying out argon plasma treatment, the discharge gas pressure is 45Pa, the discharge power is 50W, and the discharge time is 8min, then add glycidyl methacrylate In the dimethylformamide solution o...

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PUM

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Abstract

The invention discloses a preparation method of a polytetrafluoroethylene sheet for automobiles. The preparation method includes the steps that a carbon nanotube is subjected to acidification so that an acidified carbon nanotube can be obtained; acryloyl chloride reacts with the acidified carbon nanotube so that a modified carbon nanotube can be obtained; polytetrafluoroethylene micro powder is subjected to argon plasma treatment, and is added into a dimethylformamide solution of glycidyl methacrylate and the modified carbon nanotube, and after a reaction, modified polytetrafluoroethylene micro powder is obtained; samarium oxide, molybdenum disulfide, aluminum trioxide, calcium carbonate, silicon carbide, zirconium oxide, wollastonite, ferroferric oxide, copper sulfide and copper fluoride are added in acetone, hexadecyl trimethyl ammonium bromide, polyethylene glycol and a silane coupling agent are added, a stirring reaction is performed, and a modified filler is obtained; and aramid fibers, glass fibers, zinc dialkyl dithiophosphate and the modified filler are mixed uniformly, and after the modified polytetrafluoroethylene micro powder, polyacrylonitrile, epoxy resin, polyether ether ketone, polyformaldehyde and polyimide are added and stirred uniformly, the polytetrafluoroethylene sheet is obtained by means of cold pressing forming and sintering.

Description

technical field [0001] The invention relates to the technical field of polytetrafluoroethylene, in particular to a preparation method of polytetrafluoroethylene sheets for oil seals for automobiles. Background technique [0002] In the rotary motion sealing device of mechanical equipment, oil seal is widely used to prevent the leakage of working medium and prevent the intrusion of dust, water and air into the working body. Commonly used materials for oil seals range from leather and asbestos fibers used a hundred years ago to synthetic rubber used later, such as nitrile rubber, fluororubber, silicone rubber, acrylic rubber, polyurethane, and chlorohydrin rubber. Polytetrafluoroethylene is a material that is resistant to high and low temperature, strong acid and alkali corrosion, and weather resistance. Compared with rubber, its performance is better and its application range is wider. It has been widely used in the field of oil seals. However, PTFE has the defects of low me...

Claims

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Application Information

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IPC IPC(8): C08L51/00C08L77/10C08L33/20C08L63/00C08L61/16C08L59/00C08L79/08C08K13/06C08K9/06C08K9/04C08K7/24C08K3/30C08K3/26C08K7/14C08F259/08C09K3/14
CPCC08L51/003C08F259/08C08K2201/011C08L2201/08C08L2205/035C08L2205/16C09K3/14C08L77/10C08L33/20C08L63/00C08L61/16C08L59/00C08L79/08C08K13/06C08K9/06C08K9/04C08K7/24C08K2003/3009C08K2003/265C08K7/14
Inventor 马小鹏朱代贵赵青志
Owner 嘉科(安徽)密封技术有限公司
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