Cushion material, and preparation method and application thereof

Abstract

The invention discloses a cushion material, and a preparation method and application thereof and belongs to the technical field of brake blocks. The cushion material comprises the following raw material components of, by total mass, 5-15% of an organic binding agent, 1-5% of a carbon material, 40-55% of a fiber material and 25-40% of a filler. Graphene is added in the cushion material and can participate in curing crosslinking of resin in the cushion material to improve the mechanical strength of a cushion layer and meanwhile improve heat dissipating performance of the cushion material; and when the cushion material is matched with a resin-based friction material layer for use, in addition to the heat transfer blocking function, the normal-temperature and high-temperature shear strength ofthe brake blocks can further be improved greatly, and certain braking effectiveness can be provided.

Description

technical field [0001] The invention relates to the technical field of brake pads, in particular to a cushion material and its preparation method and application. Background technique [0002] Since the emergence of power machinery and motor vehicles in the world, friction materials will be used in their transmission and braking mechanisms, relying on friction to perform braking and transmission functions. According to the different materials or substrates of friction materials, friction materials can be divided into four categories: resin-based friction materials, metal-based friction materials, carbon-carbon composite materials and ceramic-based friction materials. For most passenger cars and commercial models, resin-based friction materials still occupy an absolute position. [0003] The quality of friction materials not only determines the braking performance of the car, but also affects the safety of the driver and passengers. For resin-based friction materials, due t...

AI Technical Summary

Problems solved by technology

For resin-based friction materials, due to the existence of organic resin binders, they are often easily oxidized and decomposed at high temperatures, which will lead to the attenuation of various performances of brake pads during high-temperature braking.

Therefore, with the development of technology in the industry, the amount of organic binders such as phenolic resin added to the friction material is gradually decreasing, and the reduction in the content of the organic binder will further reduce the bonding strength between the friction material and the back plate. Especially under high-temperature and high-speed braking conditions (the end temperature of the brake can reach 400 ℃ ~ 600 ℃, or even higher), the heat dissipation of the brake pad is poor, and the high temperature for a long time will cause the adhesive strength to decrease rapidly, and the friction material lining The disc is easy to fall off from the back plate, which has become a new problem in improving the safety performance of the brake

[0004] Patent CN 202937707 U discloses a brake pad with high temperature resistance and heat insulation function, that is, a 4mm high temperature resistance heat insulation layer is added on the side of the friction material close to the steel back plate, from the perspective of blocking heat transfer, preventing braking The brake pads produced in the process are prone to wear and tear due to high temperature and low work efficiency. This patent does not involve the bonding strength of the heat insulation layer, the steel back plate and the friction material layer, and the 4mm heat insulation layer contains organic phenolic resin. Accounted for 47%, modified phenolic resin accounted for 21%, friction powder 10%, of which a total of 78% organic matter, which is very easy to oxidize and decompose under high temperature conditions, especially under high temperature and high speed braking conditions, will quickly lose adhesion. There is a great hidden danger of braking safety; in addition, because the structure and thickness of the brake pad assembly of different models are not the same, the thickness of 4mm cannot meet the requirements of all models for braking safety

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