Polymer based self lubricated composite material, and preparation method

Abstract

This invention relates to a method for preparing self-lubricating composite, especially self-lubricating polymer-based composite. The method comprises: drying polymer matrix, solid lubricant, reinforcing fibers and fillers, mixing the above raw materials except fibers, mixing uniformly by a high-speed mixer, adding into an extruder, granulating, adding fiber filaments from the feed hole of the extruder, and controlling the fiber content by adjusting the rotation speed and feeding frequency to obtain self-lubricating composite granules.

Description

technical field [0001] The invention relates to a self-lubricating composite material and a preparation method thereof, in particular to a polymer-based self-lubricating composite material and a preparation method thereof. Background technique [0002] Traditional wear-resistant materials use metal as the base material, and the produced parts generate high noise and high energy consumption under high-speed operation, and lubricants need to be added, which easily pollutes the environment and products. Therefore, in recent years, polymer-based self-lubricating composite materials have received widespread attention at home and abroad, and papers and patents have emerged in an endless stream. Chinese patents CN1597771A, CN1183435A, CN1590455A, CN1425715A, CN1526756A, and CN1417255A respectively describe the preparation of polyoxymethylene, nylon, polyolefin, and polybutylene terephthalate with relatively high-priced lubricating modifiers such as polytetrafluoroethylene and molyb...

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Problems solved by technology

Chinese patents CN1597771A, CN1183435A, CN1590455A, CN1425715A, CN1526756A, and CN1417255A respectively describe the preparation of polyoxymethylene, nylon, polyolefin, and polybutylene terephthalate with relatively high-priced lubricating modifiers such as polytetrafluoroethylene and molybdenum disulfide Thermoplastic resin-based self-lubricating materials such as glycol esters, the friction coefficient of the obtained material is still above 0.15, the wear is large, the service life is short, and the friction temperature rise during use puts forward higher requirements for the temperature resistance of the material matrix.

Chinese patents CN1186827A, CN1414037A, CN1847310A, and CN1243136A respectively select polyimide, polyether ether ketone, polyarylether ketone and other high-temperature resistant resins as substrates to prepare self-lubricating materials, but their coefficient of friction still stays above 0.10, and the material cost is too high. High; Chinese patent CN200510041149.5 (application number) reports that the friction coefficient of the polyimide-based self-lubricating composite material prepared is reduced to 0.05, but because the resin selected by it is expensive, reaching about 1 million yuan per ton, so this type of material Suitable for high-temperature environments that cannot be met by ordinary resins

The self-lubricating material of polytetrafluoroethylene, which is generally recognized at home and abroad, has a relatively low friction coefficient and wear rate, but because of its low strength, it is prone to creep, and it is difficult to process and the molding method is single, so its application is limited.