Graphene-like nano carbon nitride modified polytetrafluoroethylene friction material as well as preparation method and application thereof

A PTFE, friction material technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of low mechanical strength, poor wear resistance, low hardness of pure PTFE, etc.

Active Publication Date: 2019-06-07
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Polytetrafluoroethylene (PTFE) has close dynamic and static friction coefficients, stable thermochemical properties, and easy processing, which just meet the requirements of friction materials for ultrasonic motors; but pure PTFE has low hardness, poor wear resistance, and low mechanical strength. Under the action of external force, it will produce large viscoelastic deformation, easy to creep, etc., and must be modified to meet the requirements of friction materials for ultrasonic motors
The fillers of modified PTFE mainly include carbon fiber, graphene, copper powder, etc., which cannot meet the requirements of high wear resistance and energy conversion efficiency for friction materials in ultrasonic motors

Method used

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  • Graphene-like nano carbon nitride modified polytetrafluoroethylene friction material as well as preparation method and application thereof
  • Graphene-like nano carbon nitride modified polytetrafluoroethylene friction material as well as preparation method and application thereof
  • Graphene-like nano carbon nitride modified polytetrafluoroethylene friction material as well as preparation method and application thereof

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preparation example Construction

[0038] Based on the mass fraction of the polytetrafluoroethylene, the raw materials for the preparation of the graphene-like nano-carbon nitride modified polytetrafluoroethylene friction material include 0.5-1.3 parts of graphene-like nano-carbon nitride, preferably 0.7 to 1.1 parts. In the present invention, the particle size of the graphene-like nano-carbon nitride is preferably 150-300 nm. The present invention has no special limitation on the source of the graphene-like nano-carbon nitride, it can be prepared according to methods well known to those skilled in the art; in the present invention, the graphene-like nano-carbon nitride is preferably Adopt dopamine and silane coupling agent (preferably silane coupling agent KH550) to modify, and the specific preparation method preferably comprises the following steps:

[0039] The mixture of urea and melamine (the molar ratio of urea and melamine is (1.5-2.5): (0.5-1.3)) is heat-treated at 500-600°C for 3-5 hours, cooled and g...

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Abstract

The invention relates to the technical field of composites and specifically relates to a graphene-like nano carbon nitride modified polytetrafluoroethylene friction material as well as a preparation method and application thereof. The graphene-like nano carbon nitride modified polytetrafluoroethylene friction material provided by the invention comprises the following preparation raw materials in parts by mass: 50-80 parts of polytetrafluoroethylene, 5-15 parts of polyimide, 5-10 parts of polybenzoate, 5-20 parts of aramid pulp, 5-15 parts of potassium titanate whiskers and 0.5-1.3 parts of graphene-like nano carbon nitride. The graphene-like nano carbon nitride modified polytetrafluoroethylene friction material prepared by adopting the raw materials with the proportions also has relativelylow mass wear rate and relatively high conversion efficiency on the basis of stable friction coefficient and is capable of meeting the demand for the friction material in an ultrasonic motor.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a graphene-like nano-carbon nitride modified polytetrafluoroethylene friction material and a preparation method and application thereof. Background technique [0002] Ultrasonic motor is a new concept of micro motor developed rapidly in the 1980s. It has the advantages of light weight, low speed, high torque, and fast response. In addition, it is free from electromagnetic interference. It has broad application prospects in high-tech fields such as instrumentation, robot joint drive, micro-mechanical technology, aerospace, and Mars probes. [0003] Since the ultrasonic motor transmits power through the friction interface, the friction characteristics of the interface are very important to the overall performance of the ultrasonic motor. Generally, the friction material is required to have: ① a suitable and stable friction coefficient (0.15-0.3), no creeping and crawlin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08L79/08C08L67/04C08L77/10C08K7/08C08K3/28C08K9/04C08K9/06C09K3/14
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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