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A polyimide-based self-lubricating wear-resistant coating material and its preparation method

A polyimide-based, wear-resistant coating technology, which is applied in coatings, devices for coating liquids on surfaces, and pre-treated surfaces, can solve problems such as low friction, high preparation costs, and complexity, and achieve good reduction Friction and anti-wear performance, convenient preparation and construction, and simple preparation method

Inactive Publication Date: 2011-12-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent 03180835.4 described in room temperature curing high-load wear-resistant lubricating coating has the advantages of long life surface, low friction, and load-resistant, but its components are various, and contain xylene solvents that pollute the environment and damage the human body
The high-load anti-wear nano-coating described in Chinese patent CN101440252A has good anti-wear and anti-friction ability and high load-bearing capacity, but its matrix resin is polyurethane bonding resin, and its temperature resistance is poor, and it cannot work for a long time above 160 ° C.
A kind of engine oil resistant, high temperature resistant, wear-resistant lubricating coating described in Chinese patent CN1724602A, its coating material component is various and complicated, and preparation cost is higher

Method used

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  • A polyimide-based self-lubricating wear-resistant coating material and its preparation method
  • A polyimide-based self-lubricating wear-resistant coating material and its preparation method
  • A polyimide-based self-lubricating wear-resistant coating material and its preparation method

Examples

Experimental program
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Embodiment 1

[0023] A preparation method of a polyimide-based self-lubricating wear-resistant coating material, the specific steps are as follows:

[0024] (1) Preparation of raw materials:

[0025] Preparation of polyimide bonding resin: add 200ml N,N-dimethylacetamide, 0.1mol diamine (4,4'-diaminodiphenyl ether) to a three-necked flask equipped with a thermometer and a mechanical stirrer . Start stirring, and after the diamine is completely dissolved, gradually add 0.1mol 3,3',4,4'-biphenyltetracarboxylic dianhydride. After the addition of the dianhydride monomer, continue stirring for 1 hour to obtain a transparent polyamic acid viscous liquid. The whole reaction process was protected under nitrogen.

[0026] Preparation of irradiated polytetrafluoroethylene: raw polytetrafluoroethylene powder after 60 Made of Co gamma ray irradiation, the radiation meter is 2×10 5 Gy, the average particle size after irradiation is less than 5um, and has excellent dispersion performance in polyimid...

Embodiment 2

[0029] A preparation method of a polyimide-based self-lubricating wear-resistant coating material, the specific steps are as follows:

[0030] (1) Preparation of raw materials:

[0031] Preparation of polyimide bonding resin: Add 150 ml of N,N-dimethylacetamide and 0.1 mol of diamine (4,4'-diaminodiphenyl ether) into a three-necked flask equipped with a thermometer and a mechanical stirrer. Start stirring, and after the diamine is completely dissolved, gradually add 0.1mol 3,3',4,4'-biphenyltetracarboxylic dianhydride. After the addition of the dianhydride monomer, continue stirring for 1 hour to obtain a transparent polyamic acid viscous liquid. The whole reaction process was protected under nitrogen.

[0032] Preparation of irradiated polytetrafluoroethylene: raw polytetrafluoroethylene powder after 60 Co gamma ray irradiated, the radiation dose is 1×10 5 Gy, the average particle size after irradiation is less than 5um, and has excellent dispersion performance in polyimi...

Embodiment 3

[0035] A preparation method of a polyimide-based self-lubricating wear-resistant coating material, the specific steps are as follows:

[0036] (1) Preparation of raw materials:

[0037] Preparation of polyimide bonding resin: add 180ml N,N-dimethylacetamide, 0.1mol diamine (4,4'-diaminodiphenyl ether) to a three-necked flask equipped with a thermometer and a mechanical stirrer . Start stirring, and after the diamine is completely dissolved, gradually add 0.1mol 3,3',4,4'-biphenyltetracarboxylic dianhydride. After the addition of the dianhydride monomer, continue stirring for 1 hour to obtain a transparent polyamic acid viscous liquid. The whole reaction process was protected under nitrogen.

[0038] Preparation of irradiated polytetrafluoroethylene: raw polytetrafluoroethylene powder after 60 Made of Co gamma ray irradiation, the radiation meter is 5×10 5 Gy, the average particle size after irradiation is less than 5um, and has excellent dispersion performance in polyimide ...

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Abstract

The invention discloses a polyimide-based self-lubricating abrasion-resistant coating material and a preparation method thereof. The coating material consists of the following raw materials in part by weight: 100 parts of polyimide bonded resin, 10 to 50 parts of irradiation polytetrafluoroethylene micro-powder solid lubricating agent and 200 to 400 parts of organic solvent. The preparation method comprises the following steps of: weighing and mixing the raw materials, and performing ultrasonic dispersion and magnetic stirring to form uniform resin solution; pouring the resin solution into a spray gun, and spraying the resin solution to the surface of a workpiece subjected to surface polishing and cleaning treatment under the pressure of 0.10 to 0.40Pa and under the action of oil-free compressed air, wherein the distance between the nozzle of the spray gun and the workpiece is not less than 20 centimeters, and the spray gun and the workpiece form an angle of 60 to 90 degrees; and putting the coated workpiece into a muffle furnace, performing section curing, cooling the workpiece to room temperature together with the furnace after curing, and thus obtaining the abrasion-resistant coating material on the surface of the workpiece. The coating material has the properties of low friction, high load resistance, abrasion resistance and high temperature resistance; and the preparationmethod is simple, easy in operation and low in cost.

Description

technical field [0001] The invention relates to a polyimide-based self-lubricating wear-resistant coating and a preparation method thereof. Background technique [0002] With the rapid development of modern automobile industry, machinery industry, aviation and aerospace industry, more and more high-load cylinder pistons and sliding parts are used under the action of dry friction, hydraulic pressure and lubricating oil medium. Because these parts are often used in high-load, high-speed, dry friction or oily media, due to the temperature rise during the friction process, the surface of the parts will be sintered and strained, so that the parts will fail, which greatly shortens the service life of the equipment and increases the economic cost. . Using surface engineering technology to prepare one or more layers of composite organic wear-resistant self-lubricating coatings on the surface of workpieces is a very effective way to improve the bearing capacity of cylinder pistons a...

Claims

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Application Information

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IPC IPC(8): C09D179/08C09D127/18C09D5/00B05D7/24B05D3/02
Inventor 苏峰华姚创海黄平
Owner SOUTH CHINA UNIV OF TECH
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