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Polytetrafluoroethylene/polyimide/nano silicon dioxide self-lubricating material and preparation method thereof

A technology of nano-silica and polytetrafluoroethylene, which is applied in the field of polytetrafluoroethylene/polyimide/nano-silica self-lubricating materials and their preparation, can solve the problem of uneven structure of polytetrafluoroethylene materials, etc. problem, achieve the effect of reducing easy peeling, reducing agglomeration and improving dispersion

Inactive Publication Date: 2017-07-18
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above problems, the present invention provides a polytetrafluoroethylene / polyimide / nano silicon dioxide self-lubricating material and a preparation method thereof, aiming at improving the self-lubricating property and wear resistance of polytetrafluoroethylene materials , to solve the problem of uneven structure of existing PTFE materials

Method used

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  • Polytetrafluoroethylene/polyimide/nano silicon dioxide self-lubricating material and preparation method thereof
  • Polytetrafluoroethylene/polyimide/nano silicon dioxide self-lubricating material and preparation method thereof
  • Polytetrafluoroethylene/polyimide/nano silicon dioxide self-lubricating material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] a: Nano silica dispersion preparation:

[0031] Take 0.14g of nano-silica and put it into acetone, add 0.01g of silane coupling agent (KH-560) dropwise, and after magnetic stirring and ultrasonic oscillation for 20-60min, a stable and evenly dispersed nano-silica dispersion liquid is obtained.

[0032] b. Preparation of polyimide / nano silica powder:

[0033] Add 6.00~6.20g of 4,4′-diaminodiphenyl ether to the nano-silica dispersion, and stir magnetically at 40~50°C for 40~100min, then add 9.00~9.50g of 3,3ˊ,4,4ˊ -Diphenyl ether tetra-acid dianhydride, gradually generate polyamic acid / nanometer silicon dioxide powder, after magnetic stirring at room temperature for 3-6 hours, add triethylamine, acetic anhydride and toluene (the amount added is respectively polyamic acid / nanometer 40-60%, 300-400%, 150-250% of the silica mass), continue to stir for 1-3 hours to complete the imidization reaction, after suction filtration and washing with acetone, dry the product, and At a ...

Embodiment 2

[0039] a: Nano silica dispersion preparation:

[0040] Take 0.42g of nano-silica and put it into acetone, add 0.04g of silane coupling agent (KH-560) dropwise, and after magnetic stirring and ultrasonic oscillation for 20-60min, a stable and evenly dispersed nano-silica dispersion liquid is obtained.

[0041] b. Preparation of polyimide / nano silica powder:

[0042] Add 6.00~6.20g of 4,4′-diaminodiphenyl ether to the nano-silica dispersion, and stir magnetically at 40~50°C for 40~100min, then add 9.00~9.50g of 3,3ˊ,4,4ˊ -Diphenyl ether tetra-acid dianhydride, gradually generate polyamic acid / nanometer silicon dioxide powder, after magnetic stirring at room temperature for 3-6 hours, add triethylamine, acetic anhydride and toluene (the amount added is respectively polyamic acid / nanometer 40-60%, 300-400%, 150-250% of the silica mass), continue to stir for 1-3 hours to complete the imidization reaction, after suction filtration and washing with acetone, dry the product, and At ...

Embodiment 3

[0048] a: Nano silica dispersion preparation:

[0049] Take 0.98g of nano-silica and put it into acetone, add 0.09g of silane coupling agent (KH-560) dropwise, and after magnetic stirring and ultrasonic oscillation for 20-60min, a stable and evenly dispersed nano-silica dispersion liquid is obtained.

[0050] b. Preparation of polyimide / nano silica powder:

[0051] Add 6.00~6.20g of 4,4′-diaminodiphenyl ether to the nano-silica dispersion, and stir magnetically at 40~50°C for 40~100min, then add 9.00~9.50g of 3,3ˊ,4,4ˊ -Diphenyl ether tetra-acid dianhydride, gradually generate polyamic acid / nanometer silicon dioxide powder, after magnetic stirring at room temperature for 3-6 hours, add triethylamine, acetic anhydride and toluene (the amount added is respectively polyamic acid / nanometer 40-60%, 300-400%, 150-250% of the silica mass), continue to stir for 1-3 hours to complete the imidization reaction, after suction filtration and washing with acetone, dry the product, and At ...

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Abstract

The invention provides a polytetrafluoroethylene / polyimide / nano silicon dioxide self-lubricating material and a preparation method thereof. The polytetrafluoroethylene / polyimide / nano silicon dioxide self-lubricating material comprises 19-20% of polytetrafluoroethylene, 0.01-3% of polyimide and the balance of nano silicon dioxide. The polyimide is uniformly distributed in a polytetrafluoroethylene matrix while the nano silicon dioxide is fully and uniformly distributed in polyimide. The preparation method comprises the following steps: (1) preparing a self-lubricating material mixture; (2) forming the self-lubricating material; and (3) sintering the self-lubricating material. The polytetrafluoroethylene / polyimide / nano silicon dioxide self-lubricating material provided by the invention has the characteristics of being low in coefficient of friction, high in wear resistance, relatively good in tissue uniformity and the like, can be applied to occasions of an inner ball of a self-lubricating spherical plain bearing, a self-lubricating sleeve, a self-lubricating guide rail and a retaining rack of the self-lubricating spherical plain bearing and etc, and has very high application value.

Description

technical field [0001] The invention belongs to the technical field of self-lubricating modification of polymer materials, and in particular relates to a polytetrafluoroethylene / polyimide / nano silicon dioxide self-lubricating material and a preparation method thereof. Background technique [0002] PTFE has excellent corrosion resistance, heat resistance and self-lubricating properties, and is widely used in self-lubricating fields, such as self-lubricating joint bearing inner balls, self-lubricating bushings, self-lubricating machine tool guideways, self-lubricating maintenance of rolling bearings shelf. However, pure PTFE has low mechanical properties, easy creep and poor wear resistance, which limit its application in the field of self-lubrication. [0003] The method of filling modification can effectively improve the wear resistance of polytetrafluoroethylene, mainly because the filler can effectively inhibit the peeling of polytetrafluoroethylene during the friction pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08L79/08C08K9/06C08K3/36C08G73/10
CPCC08G73/1071C08K2201/003C08K2201/011C08L27/18C08L79/08C08K9/06C08K3/36
Inventor 齐效文赵元亮
Owner YANSHAN UNIV
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