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Thermoplastic polyimide lubricating antifriction materials and method for preparing same

A technology of polyimide and multi-phase materials, applied in lubricating compositions, petroleum industry, additives, etc., can solve the problems of unstable oil film thickness and oil release rate, and volatile lubricants, so as to reduce friction coefficient and wear efficiency, prevention of oxidation failure, good viscosity and effects of high temperature resistance

Active Publication Date: 2007-04-25
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that in a high-temperature and high-speed environment, the lubricant in the relative moving surface of the parts is volatile, and the thickness of the oil film and the oil release rate are unstable. A kind of high-temperature-resistant thermoplastic polyimide porous material is proposed. Skeleton, high dropping point lubricating grease is used as lubricant, utilizes high-temperature vacuum infiltration method to contain lubricating grease in the material pore, constitutes lubricating anti-friction multi-phase material, another purpose of the present invention is to provide the preparation method of above-mentioned multi-phase material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The porous polyimide material is first cleaned with ethanol, and then lithium-based grease is evenly coated on the surface of the porous polyimide material (with a porosity of 10%), and the amount of the grease is 15% of the volume of the material. Place in a vacuum constant temperature device with a vacuum degree of 0.08 bar, an infiltration temperature of 200°C, and a holding time of 8 hours. The obtained multi-phase material is tested according to the national standard: the volume oil content is 10%, the friction coefficient is 0.04-0.05, and the volume wear rate is 6.61×10 -14 m 3 / (N·m), the thermal weight loss is 6%.

Embodiment 2

[0026] The porous polyimide material is first cleaned with acetone, and then the bentonite-based lubricating grease is evenly coated on the surface of the porous polyimide material (with a porosity of 15%), and the amount of the grease is 20% of the volume of the material. Place in a vacuum constant temperature device with a vacuum degree of 0.1 bar, an infiltration temperature of 270°C, and a holding time of 4 hours. The obtained multi-phase material is tested according to the national standard: the volume oil content is 15%, the friction coefficient is 0.05-0.06, and the volume wear rate is 5.41×10 -14 m 3 / (N·m), the thermal weight loss is 8%.

Embodiment 3

[0028] The porous polyimide material is first cleaned with acetone, and then urea-based grease is evenly coated on the surface of the porous polyimide material (with a porosity of 20%), and the amount of the grease is 25% of the volume of the material. Place in a vacuum constant temperature device with a vacuum degree of 0.01 bar, a permeation temperature of 250°C, and a holding time of 10 hours. The obtained multi-phase material is tested according to the national standard: the volume oil content is 20%, the friction coefficient is 0.06-0.07, and the volume wear rate is 5.01×10 -14 m 3 / (N·m), the thermal weight loss is 3%.

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Abstract

The invention relates to a kind of lubricating and anti-friction multiphase material as well as its preparing method, especially the new type material that uses the heat proof thermoplastic medlin as the frame material being filled with grease. The invention adopts heat proof thermoplastic medlin as the frame and high drop point grease as the lubricant. The grease is put into the pore of the material by high temperature vacuum permeating method to form the lubricating and anti-friction multiphase material. The grease is enveloped inside to prevent its expire by oxidation; during the rubbing process, the grease can form steady lubricating membrane by the discrepancy of thermal expansion quotient and centrifugation; besides, the constant renewal of the rubbing surface ensured the prolonged action of the grease to fulfill the working conditions of high temperature and high speed.

Description

technical field [0001] The invention relates to a lubricating and antifriction multiphase material and a preparation method thereof, in particular to a novel lubricating and antifriction multiphase material which uses a high-temperature-resistant thermoplastic polyimide material as a skeleton material and is filled with grease, and a preparation method thereof. To meet the requirements of high temperature and high speed working conditions. Background technique [0002] With the development of the automotive industry, precision machinery and aerospace and other fields, sliding or rolling parts require long-lasting stability under high-speed operation. Optimizing the friction and wear properties of materials by screening different matrix materials and compound modification has limited effect. Under lubricating conditions, the oil film produced by the lubricant can convert dry friction into internal friction between lubricant molecules, achieving the effect of reducing frictio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M149/18C10N30/06C10N50/00
Inventor 黄培朱鹏王晓东闫普选
Owner NANJING UNIV OF TECH
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