Polyamide-imide/liquid crystal polymer alloy solid self-lubricating wear-resistant coating and preparation method thereof

Abstract

The invention discloses a polyamide-imide / liquid crystal polymer alloy solid self-lubricating wear-resistant coating and a preparation method thereof. The wear-resistant coating is prepared from the following materials in parts by weight: 1-13% of polytetrafluoroethylene, 5-8% of molybdenum disulfide, 5-10% of silicon carbide ceramic, 5-10% of boron nitride, 5-10% of graphite and the balance of organic solvent. The polytetrafluoroethylene is 1-15m particles, the silicon carbide ceramic and the boron nitride ceramic are nanoscale powder, and the graphite and the molybdenum disulfide are 3-5m particles. The self-lubricating coating prepared by the invention not only has a lower friction coefficient at a low temperature, but also is changed into a liquid crystal phase by means of a phase generated by melting of a liquid crystal polymer in a state that the working temperature is increased due to accumulation of friction heat; the coating prepared by the method absorbs a large amount of friction heat so as to avoid the thermal aging phenomenon of the macromolecular binding phase caused by heat accumulation, and meanwhile, the friction coefficient of the coating is also greatly reduced due to the appearance of the liquid crystal phase, so that a good antifriction effect is still kept at high temperature.

Description

technical field [0001] The invention relates to the technical field of polymer material preparation, in particular to a polyamide-imide / liquid crystal polymer alloy solid self-lubricating wear-resistant coating and a preparation method thereof. Background technique [0002] The anti-wear performance and friction coefficient in wear-resistant coatings are the key indicators for evaluating the wear-resistant ability of coatings. Once the surface coating is worn away, it cannot continue to provide effective protection for the workpiece in relative motion. Therefore, from the application point of view, the coating must have good anti-wear properties and low enough friction coefficient no matter what the conditions of use. Polyamide-imide (PAI for short) was first developed by American Amoco Company in 1964 to improve the processability of polyimide. It is an amorphous high-temperature resistant engineering thermoplastic resin. A polymer that contains both flexible amide groups...

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Problems solved by technology

[0004] In 1981, Barchan found through research on synovial fluid of bone joints, mucus of fish scales, blood and liquid crystal mixtures coated on metal surfaces that when these substances are in the liquid crystal state, they all have very good lubricity, but above the clearing point This lubricating effect is gone.

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