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Polytetrafluoroethylene composite material, and preparation method and application thereof

A technology of polytetrafluoroethylene and polytetrafluoroethylene resin, which is applied in the field of polytetrafluoroethylene composite materials and its preparation, can solve problems such as unsatisfactory use requirements, decreased tensile strength and toughness, high elongation at break, etc.

Active Publication Date: 2021-11-09
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional PTFE wear-resistant composite materials have problems such as weak bearing capacity and poor wear resistance, which cannot meet the requirements of use, and must be filled and modified to meet the requirements of harsh working conditions.
In order to improve its load-bearing capacity and wear resistance, the existing technology generally achieves it by adding fibers, solid lubricants and other special nano-functional fillers, but after filling the above-mentioned fillers, its tensile strength and toughness are reduced, which is difficult to achieve. High load carrying capacity and high elongation at break

Method used

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  • Polytetrafluoroethylene composite material, and preparation method and application thereof
  • Polytetrafluoroethylene composite material, and preparation method and application thereof
  • Polytetrafluoroethylene composite material, and preparation method and application thereof

Examples

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preparation example Construction

[0042] The present invention also provides a preparation method of the polytetrafluoroethylene composite material described in the above technical solution, comprising the following steps:

[0043] mixing coupling agent, inorganic nano filler, glass fiber, polytetrafluoroethylene resin, polyimide, graphite, tin bronze powder and absolute ethanol to obtain a compound;

[0044] Compressing the mixture to obtain a blank;

[0045] Sintering the blank to obtain the polytetrafluoroethylene composite material;

[0046] The particle diameters of the polytetrafluoroethylene resin, tin bronze powder, polyimide, glass fiber and graphite are in micron order.

[0047] The invention mixes coupling agent, inorganic nano filler, glass fiber, polytetrafluoroethylene resin, polyimide, graphite, tin bronze powder and absolute ethanol to obtain the compound.

[0048] In the present invention, the mixing preferably includes the following steps:

[0049] After the coupling agent and absolute ethan...

Embodiment 1

[0063] Disperse 0.1g of N,-[3-(trimethoxysilyl)propyl]ethylenediamine in 300g of absolute ethanol, stir for 0.5h, add 1g of nano-silicon carbide (particle size is 20nm) and 5g of glass fiber (diameter is 14μm, aspect ratio is 8:1), after stirring for 0.5h, add 70g polytetrafluoroethylene resin (particle size is 50μm), 5g polyimide (particle size is 45μm), 3g graphite (particle size Diameter is 5 μm) and 20g tin bronze powder (brand 663, particle diameter is 2 μm), after stirring for 1h, filter, dry, obtain mixture;

[0064] Put the mixture in a small universal pulverizer, add 300g each time, rotate at 24000rpm, and take 30s. After passing through a 45-mesh sieve, add the sieved mixture into the mould, first using a pressure of 25MPa After forward pressing for 1 min and compaction, adopt a pressure of 50 MPa to press upside down for 5 min, demould, and obtain a blank;

[0065] Put the blank into a sintering furnace for sintering, raise the temperature from room temperature to ...

Embodiment 2

[0067] Disperse 0.06g of N,-[3-(trimethoxysilyl)propyl]ethylenediamine in 200g of absolute ethanol, stir for 1h, add 0.5g of nano silicon carbide (particle size 15nm), 0.5g of nano Silicon nitride (particle size is 30nm) and 3g glass fiber (diameter is 12μm, aspect ratio is 10:1), after stirring for 1h, add 65g polytetrafluoroethylene resin (particle size is 70μm), 10g polyimide Amine (38 μm in particle size), 1 g of graphite (1 μm in particle size) and 25 g of tin bronze powder (grade 663, 1 μm in particle size), stirred for 1 hour, filtered, and dried to obtain a mixture;

[0068] Put the mixture in a small universal pulverizer, add 350g each time, rotate at 24000rpm, and take 40s. After passing through a 70-mesh sieve, add the sieved mixture into the mold, and first use a pressure of 20MPa After forward pressing for 2 minutes and compaction, adopt a pressure of 45 MPa to press upside down for 7 minutes, demoulding, and obtain a blank;

[0069] Put the blank into a sinterin...

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Abstract

The invention relates to the technical field of lubricating sealing materials, and especially relates to a polytetrafluoroethylene composite material, and a preparation method and application thereof. The polytetrafluoroethylene composite material provided by the invention comprises, by mass, 60-70 parts of polytetrafluoroethylene resin; 20-30 parts of tin bronze powder; 5-10 parts of polyimide; 1-5 parts of glass fiber; 1-5 parts of graphite; 0.5-2 parts of an inorganic nano filler; and 0.05 to 0.2 part of a coupling agent. The particle sizes of the polytetrafluoroethylene resin, the tin bronze powder, the polyimide, the glass fibers and the graphite are micron-sized. The polytetrafluoroethylene composite material has relatively high strength and toughness at the same time.

Description

technical field [0001] The invention relates to the technical field of lubricating and sealing materials, in particular to a polytetrafluoroethylene composite material and its preparation method and application. Background technique [0002] According to the report of the Chinese Academy of Engineering on the "Research on Tribological Science and Engineering Application Status and Development Strategy", about one-third of the world's primary energy is consumed by friction, and 60% of machine parts failure is caused by wear. Friction and wear not only cause a lot of material and component waste, but also may directly lead to catastrophic accidents. With the increasingly harsh service conditions of new equipment, harsh working conditions such as wide temperature range, heavy load, high speed, strong impact and poor lubrication have put forward extremely high requirements on the lubrication and anti-wear properties of materials. [0003] With its excellent designability, PTFE ...

Claims

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Application Information

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IPC IPC(8): C08L27/18C08L79/08C08K9/06C08K7/14C08K3/04C08K3/08C08K3/34C08K3/36
CPCC08L27/18C08K2201/011C08L79/08C08K9/06C08K7/14C08K3/04C08K3/08C08K3/34C08K3/36
Inventor 张新瑞谢海李宋王齐华王廷梅
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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