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A kind of polyimide friction material and its preparation method and application

A polyimide and friction material technology, applied in the field of friction materials, can solve the problems of high price, increased material cost, pollution, etc., and achieve the effects of protecting the environment, improving wear resistance, and reducing pollution

Active Publication Date: 2021-03-16
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

But these fillers are expensive, which virtually increases the cost of materials
In addition, some fillers will pollute the environment, such as copper powder, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The present invention provides the preparation method of the polyimide friction material described in the above scheme, comprising the following steps:

[0023] The polyimide and rice husk charcoal are mixed, and the obtained mixture is molded to obtain a polyimide friction material.

[0024] In the present invention, polyimide and rice husk charcoal are mixed to obtain a mixture. In the present invention, the mixing method is preferably: disperse the polyimide and rice husk charcoal into absolute ethanol, and perform ball milling on the obtained slurry; the rotation speed of the ball milling is preferably 150-200 rpm , the time is preferably 4 to 6 hours. The present invention utilizes ball milling to make the polyimide and rice husk charcoal mixed more uniformly. In the present invention, the ratio of the total amount of the polyimide and rice husk charcoal to the amount of anhydrous ethanol is preferably 100g:1-2L, more preferably 100g:1.2-1.8L. In the present inv...

Embodiment 1

[0031] 85 g of polyimide and 15 g of rice husk charcoal were ultrasonically dispersed in 1 L of absolute ethanol for 30 min, and milled with a ball mill for 4 h at a rotational speed of 150 rpm. The powder was obtained by suction filtration, washing and drying in an oven at 90 °C for 3 h. The powder is put into a mold, heated from room temperature to 380° C. under a pressure of 20 MPa, molded for 200 min, and released at room temperature to obtain a polyimide friction material.

Embodiment 2

[0033] 80 g of polyimide and 20 g of rice husk charcoal were ultrasonically dispersed in 2 L of absolute ethanol for 35 min, and milled with a ball mill for 6 h at a rotational speed of 200 rpm. The powder was obtained by suction filtration, washing and drying in an oven at 100 °C for 5 h. The powder is put into a mold, heated from room temperature to 360° C. under a pressure of 10 MPa, molded for 150 min, and released at room temperature to obtain a polyimide friction material.

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Abstract

The invention provides a polyimide friction material and a preparation method and application thereof, and relates to the technical field of friction materials. The polyimide friction material comprises the following preparation raw materials in parts by mass: 70-85 parts of polyimide and 15-30 parts of rice husk carbon. The rice husk carbon is adopted as a filler, the rice husk carbon is a low-cost and environment-friendly filler, and when the rice husk carbon is used for preparing the polyimide friction material, the wear resistance of the material can be improved, and the wear rate of the friction material is greatly reduced. The result of the embodiment shows that the friction coefficient of the polyimide friction material provided by the invention is greater than or equal to 0.32, thewear rate is 3.24-9.21*10<-8>mm<3> / Nm, the conversion efficiency is greater than or equal to 41%, and compared with a single polyimide material, the wear resistance is remarkably improved. Besides, the rice husk carbon is used as filler of the friction material, so that not only can pollution be reduced and the environment be protected, but also wastes can be fully utilized.

Description

technical field [0001] The invention relates to the technical field of friction materials, in particular to a polyimide friction material and a preparation method and application thereof. Background technique [0002] Precision drive technology is one of the core common technologies in the development of science and technology in the world today, and has important application requirements in aerospace and other fields. The ultrasonic motor uses the inverse piezoelectric effect of piezoelectric materials to make the stator generate micro-mechanical vibration in the ultrasonic frequency band. Through the friction between the stator and the rotor, the micro-vibration of the stator is converted into the macroscopic motion of the rotor. It is a new type of precision drive. Micro and special motors have the advantages of high precision, light weight, fast response speed, and good electromagnetic compatibility, and stand out among many emerging drive / control technologies. Foreign ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L79/08C08K3/04C09K3/14
CPCC08K3/04C09K3/1436C08L79/08
Inventor 王齐华李宋张新瑞王廷梅
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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