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Method for synergistically modifying polytetrafluoroethylene wear-resistant material by using multi-scale organic/inorganic filler

A polytetrafluoroethylene and inorganic filler technology, applied in the fields of composite materials and lubricating materials, can solve the problem of not finding the wear resistance of polytetrafluoroethylene, and achieve the effect of improving comprehensive performance and improving wear resistance.

Inactive Publication Date: 2020-12-11
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

At present, it has been reported in the literature that the synergistic effect of lubricants and rare earth compounds is used to improve the wear resistance of polytetrafluoroethylene, but no public documents and documents have been found to improve the wear resistance of polytetrafluoroethylene synergistically with polyamide-imide and nano-yttrium oxide. Patent report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Raw material ratio: 94.5g of polytetrafluoroethylene, 5g of polyamideimide, and 0.5g of nanometer yttrium oxide.

[0021] Preparation Process:

[0022] (1) Low-temperature freezing mixing and screening: put polytetrafluoroethylene and polyamideimide into the low-temperature freezing mixing machine, adjust the temperature of the mixing chamber to -10°C, stir at a speed of 650r / min, stir and mix for 10 minutes, and mix After uniformity, vibrating sieve is filtered and dried to obtain a uniform mixture;

[0023] (2) Drying: Put the mixture into an oven at a temperature of 100°C and a drying time of 8 hours;

[0024] (3) Compression molding: Put the dried mixture into a metal mold, place it horizontally on a hydraulic press, press it for 10 minutes under a pressure of 35MPa, and demould to obtain a preformed blank; then put the preformed blank into flexible silicone rubber Put it into a cold isostatic pressing machine and press it to obtain a cold isostatic pressing blank...

Embodiment 2

[0028] Raw material ratio: 94g of polytetrafluoroethylene, 5g of polyamideimide, and 1g of nanometer yttrium oxide.

[0029] Preparation Process:

[0030] (1) Low-temperature freezing mixing and screening: put polytetrafluoroethylene and polyamideimide into the low-temperature freezing mixing machine, adjust the temperature of the mixing chamber to -5°C, stir at a speed of 1300r / min, stir and mix for 15 minutes, and mix After uniformity, vibrating sieve is filtered and dried to obtain a uniform mixture;

[0031] (2) Drying: put the mixture into an oven at a temperature of 110°C and a drying time of 6 hours;

[0032] (3) Compression molding: Put the dried mixture into a metal mold, place it horizontally on a hydraulic press, press it under a pressure of 50MPa for 5 minutes, and get a preformed blank after demoulding; then put the preformed blank into flexible silicone rubber Put it into a cold isostatic pressing machine and press it to obtain a cold isostatic pressing blank; ...

Embodiment 3

[0036] Raw material ratio: polytetrafluoroethylene 89g, polyamideimide 10g, nanometer yttrium oxide 1g.

[0037] Preparation Process:

[0038] (1) Low-temperature freezing mixing and screening: Put polytetrafluoroethylene and polyamide-imide into the low-temperature freezing and mixing machine, adjust the temperature of the mixing chamber to -8°C, stir at a speed of 1300r / min, and mix for 20 minutes; mix After uniformity, filter with vibrating sieve and dry to obtain uniform mixture;

[0039] (2) Drying: Put the mixture into an oven at a temperature of 105°C and a drying time of 7 hours;

[0040] (3) Compression molding: Put the dried mixture into a metal mold, place it horizontally on a hydraulic press, press it under a pressure of 45MPa for 10 minutes, and obtain a preformed blank after demoulding; then put the preformed blank into flexible silicone rubber Put it into a cold isostatic pressing machine and press it to obtain a cold isostatic pressing blank. Cold isostatic ...

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Abstract

The invention discloses a method for synergistically modifying a polytetrafluoroethylene wear-resistant material with an organic / inorganic filler, which comprises the following steps of: putting polytetrafluoroethylene and polyamideimide into a low-temperature freezing and mixing all-in-one machine, carrying out low-temperature freezing, mixing, screening and drying to obtain a mixture; putting the mixture into an oven, completely drying the mixture, prepressing the mixture on a hydraulic machine, and pressing themixture in a cold isostatic press to obtain a cold isostatic press blank; and carrying out staged sintering in a sintering furnace, and cooling an obtained product to room temperature after finishing sintering so as to obtain thepolytetrafluoroethylene wear-resistant material. According to the method of the invention, after the polytetrafluoroethylene is compositely filled with the micron-scale organic filler polyamide-imide and inorganic nano-particle yttrium oxide, the wearresistance of the polytetrafluoroethylene composite material is greatly improved; staged heating sintering is adopted, the comprehensive performance of polytetrafluoroethylene is well improved by controlling the sintering heating speed and the sintering temperature and strictly controlling the cooling speed, and the polytetrafluoroethylene is a valuable lubricating, wear-resisting and sealing material.

Description

technical field [0001] The invention relates to a method for preparing a modified polytetrafluoroethylene wear-resistant material, in particular to a method for preparing a micro-nano multi-scale organic / inorganic filler synergistically modified polytetrafluoroethylene wear-resistant material, which belongs to the technical field of composite materials and Technical field of lubricating materials. Background technique [0002] PTFE has the smallest friction coefficient among plastics and is an ideal oil-free lubricating material. However, pure PTFE has low load-carrying capacity, easy creep, and poor wear resistance. Improving the wear resistance of PTFE through material compounding is an important way to expand its use under harsh working conditions. Filling modification with inorganic and organic fillers is the most commonly used and effective modification method, and the wear resistance of modified PTFE composites is not only related to the type of filler, but also close...

Claims

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Application Information

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IPC IPC(8): C08L27/18C08L79/08C08K3/22
CPCC08L27/18C08K2003/221C08K2201/011C08K2201/005C08L79/08C08K3/22
Inventor 张新瑞谢海李宋王齐华王廷梅
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI