Composite friction material prepared by reclaiming friction material by pyrolysis of brake shoe and its preparation method

Abstract

The invention discloses a composite friction material prepared from a brake shoe pyrolyzed and recycled friction material, and relates to the technical field of the friction materials. The composite friction material consists of the following components: the brake shoe pyrolyzed and recycled friction material, a matrix adhesive, reinforced fibers and stuffing, wherein the stuffing comprises iron powder, graphite and barium sulfate; the preparation steps for the composite friction material are as follows: pyrolyzing a brake shoe and then impacting the brake shoe for separating a steel back from the friction material, and crushing and screening the friction material for later use; mixing the raw materials in proportion to obtain mixed materials, adding the mixed materials into a mould to carry out hot-pressing and forming; and finally, cooling and de-molding the mixed materials to obtain the composite friction material. According to the invention, the proportion of the brake shoe pyrolyzed and recycled friction material, the matrix adhesive, the reinforced fibers and the stuffing is optimized, and the synthesis process for the composite friction material is optimized, so that the composite friction material with small thermal failure, good thermal restoring character and high bending strength is obtained, and therefore, the purpose of utilizing the brake shoe pyrolyzed and recycled friction material to the greatest extent is realized, the preparation process for the composite friction material is simplified, the production cost is reduced, and the environmental protection is facilitated.

Description

technical field [0001] The invention relates to the technical field of friction materials, in particular to a composite friction material prepared by pyrolyzing and recovering friction materials from brake shoes and a preparation method thereof. Background technique [0002] The basic structure of brake shoes (brake pads) used in road traffic vehicles, agricultural vehicles, industrial and mining machinery, etc. is composed of steel back and polymer composite friction material. The composition of polymer friction material is complex, mainly including resin matrix, reinforcing fiber, filler, etc. As many as ten to twenty kinds, involving polymers (resin, rubber, etc.), metals (reinforcing fibers, metal powder fillers, etc.), inorganic rare earth fillers (wear-resistant fillers, etc.). There are as many as 15,000 pieces of waste train brake pads (brake pads) per year. Except for the steel backs that can be recycled as scrap steel, there is no research on the recycling and reus...

AI Technical Summary

Problems solved by technology

There are as many as 15,000 pieces of waste train brake pads (brake pads) per year. Except for the steel backs that can be recycled as scrap steel, there is no research on the recycling and reuse of waste friction materials. The main reasons are: (1) Composition of friction materials It is very complicated, involving polymers (resin, rubber, etc.), metals (reinforcing fibers, metal powder fillers, etc.), inorganic minerals (wear-resistant fillers, etc.), making the separation and recycling technology complicated; (2) Resin matrix after use High temperature carbonization, performance decline; (3) Recycling cost problem

A huge number of discarded brake shoes are replaced every year, which are mainly buried and backfilled as industrial solid waste, occupying a large amount of land resources and causing great harm to the environment

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