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Filled modified polytetrafluoroethylene material as well as application and preparation method thereof

A polytetrafluoroethylene modification technology, which is applied in the field of filled modified polytetrafluoroethylene materials and its application and preparation, can solve the problems of slow loss of frictional heat in dynamic seals, poor stability of polytetrafluoroethylene parts, wear parts Serious equipment wear and other problems, to achieve the effect of improving friction and wear resistance and service life, excellent corrosion resistance, and wide operating temperature range

Active Publication Date: 2017-09-19
BENCI HUARIF MACROMOLECULE MATERIAL MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing formulations still have disadvantages such as poor dimensional stability, poor wear resistance, poor thermal conductivity, slow dissipation of heat generated by dynamic seal friction, and unfavorable sealing.
Especially the formula filled with glass fiber powder and molybdenum disulfide powder is widely used, but there are also many shortcomings: first, because the glass fiber powder is relatively hard, the equipment wear on the abrasive parts is more serious; second , because the surface of the filled PTFE workpiece will be rough after being filled with glass fiber powder, it is not easy to process a product with a better finish; third, it is used to process PTFE parts filled with glass fiber powder, which will cause wear and tear on the turning tool Seriously, it will cause the following situations: First, the tool wears extremely fast, and the frequency of parking and sharpening is high, which affects production efficiency; second, the tool is expensive, especially imported turning tools, resulting in higher production costs; third is Due to the wear of the turning tool, the processing size error is relatively large, especially for products with high cylinders, the error between the starting size of the tool and the end of the product is large, resulting in a size that is out of tolerance and unqualified; Tetrafluoroethylene parts have poor stability, easy to deform, increased product brittleness, and short service life

Method used

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  • Filled modified polytetrafluoroethylene material as well as application and preparation method thereof
  • Filled modified polytetrafluoroethylene material as well as application and preparation method thereof
  • Filled modified polytetrafluoroethylene material as well as application and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0098] The preparation method of the present invention has the advantages of simple process, convenient operation, high efficiency and low cost, and the preparation process effectively ensures that each raw material component is fully mixed, and can effectively ensure product quality, uniformity and stability.

[0099] In an optional embodiment, the mixing speed of the high-speed mixer is 2000-3000 rpm, the mixing temperature is 18°C-32°C, the mixing times are 2-4 times, and the mixing time is 15 minutes each time. ~30 seconds;

[0100] Preferably, the molding pressure is 20MPa-65MPa; the molding is a cold molding process.

[0101] Preferably, the sintering temperature is 370°C-385°C, the sintering time is 4-15 hours, after 90-240 minutes of heat preservation, the temperature is lowered to 100-150°C, taken out, cooled to room temperature and machined after 24-48 hours to obtain a sealed pieces of finished products.

[0102] In an optional embodiment, the dry basis moisture c...

Embodiment 1－4

[0109] As shown in Table 1, a filled modified polytetrafluoroethylene material is made of raw materials including the following weight percentages.

[0110] Table 1 Example 1-4 filled modified polytetrafluoroethylene material

[0111]

[0112] Among them, the polytetrafluoroethylene is suspended polytetrafluoroethylene fine particles, the particle size is 20 μm, and the number average molecular weight of the polytetrafluoroethylene is 10 million.

[0113] The stainless steel powder is 06Cr19Ni10, and the particle size of the stainless steel powder is 500 mesh.

[0114] The purity of the molybdenum disulfide powder is 98%, and the particle size of the molybdenum disulfide powder is 6000 mesh.

Embodiment 5－8

[0116] As shown in Table 2, a filled modified polytetrafluoroethylene material is made of raw materials including the following weight percentages.

[0117] Table 2 Example 5-8 filled modified polytetrafluoroethylene material

[0118]

[0119] Among them, the polytetrafluoroethylene is suspended polytetrafluoroethylene fine particles, the particle size is 60 μm, and the number average molecular weight of polytetrafluoroethylene is 6 million.

[0120] The stainless steel powder is 06Cr17Ni12Mo2, and the particle size of the stainless steel powder is 400 mesh.

[0121] The purity of the molybdenum disulfide powder is 99%, and the particle size of the molybdenum disulfide powder is 8000 mesh.

[0122] The solid additives in Examples 5 and 6 are mica powder, and the solid additives in Examples 7 and 8 are nano ceramic powders.

[0123] The heat-resistant polymer is p-polyphenylene.

[0124] The coupling agent is silane.

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Abstract

The invention belongs to the technical field of polytetrafluoroethylene materials and particularly relates to a filled modified polytetrafluoroethylene material as well as application and a preparation method thereof. By taking stainless steel powder as a filler, the filled modified polytetrafluoroethylene material provided by the invention is prepared from the following raw materials in percentage by weight: 70-95 percent of polytetrafluoroethylene, 3-20 percent of the stainless steel powder and 2-10 percent of molybdenum disulfide powder. The invention also provides the application of the filled modified polytetrafluoroethylene material in the aspect of preparing a sealing piece. The filled modified polytetrafluoroethylene material has good self-lubricity, wear resistance and size stability, is good in smooth finish, liable to process, excellent in corrosion resistance performance and high and low temperature resistance performance, high in mechanical strength, wide in temperature range and good in heat conductivity, is very liable to transfer heat outsides particularly under the high temperature working condition, can keep the size of a product stable without easiness in deformation, and thus the antifriction and wear resistance performance of the product are greatly improved, and the service life of the product is greatly prolonged.

Description

technical field [0001] The invention belongs to the technical field of polytetrafluoroethylene materials, and in particular relates to a filled modified polytetrafluoroethylene material and its application and preparation method. Background technique [0002] Polytetrafluoroethylene is a perfluorinated polymer obtained by free radical polymerization of monomer tetrafluoroethylene. Due to its special structural characteristics, it has high chemical stability, high and low temperature resistance, and outstanding non-stick properties. Good lubricity, excellent electrical insulation and aging resistance, etc. PTFE is widely used in industries such as atomic energy, national defense, aerospace, electronics, electrical, chemical industry, machinery, instruments, meters, construction, pharmaceuticals, medical treatment, metallurgy, etc. coating etc. [0003] However, PTFE also has certain shortcomings, such as poor mechanical properties, poor creep resistance, poor wear resistanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08L65/02C08K3/08C08K3/30C08K3/00C08K3/34B29C43/00B29B7/10B29B7/28B29L31/26
CPCB29B7/10B29B7/283B29C43/006B29L2031/265C08K3/08C08K3/30C08K2003/3009C08K2201/011C08L27/18C08L2201/08C08L65/02C08K3/34C08K13/02C08K3/00
Inventor 刘晖
Owner BENCI HUARIF MACROMOLECULE MATERIAL MFG CO LTD
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