Improved paper-base friction material and its production process

Abstract

The present invention is one kind of paper-base friction material used in friction wafer in power transmission and braking assembly of machine, vehicle, ship, etc. and its production process. The main components include matrix 40-60 wt%, friction agent 5-10 wt%, friction regulator 4-20 wt% and forming agent 15-35 wt%. The production process includes weighing the material and breaking to form slurry, beating slurry, making raw paper, cutting, soaking in forming agent, hot curing, adhering to core board and hot curing again. The friction material has high friction coefficient, high friction resistance and excellent heat resistance, and the production process and product quality is easy to control.

Description

technical field [0001] The invention relates to a paper-based friction material, in particular to a paper-based friction material for making friction plates in power transmission and braking assemblies of machinery, vehicles, ships, etc. and a manufacturing method thereof. Background technique [0002] Wet paper-based friction material is the main friction material of wet clutch. One of the main application fields is from the automatic transmission of automobiles. This kind of clutch plate absorbs low energy and has a large amount of cooling oil. Paper-based friction material is selected for design The motivation is to consider that the paper-based friction material is a material developed with the help of papermaking technology, which can be industrialized, has low price, and has a high dynamic and static friction coefficient, which can reduce the structure of the clutch. [0003] CN1084447C discloses "a kind of paper-based friction material and its manufacturing method", w...

AI Technical Summary

Problems solved by technology

[0004] The manufacturing method described in the above-mentioned patent adopts the wet ball milling method, which must be separated from the ball material every time. It is obviously difficult to realize industrial production, especially in order to improve the friction coefficient, adding barite powder or Cast stone powder, the specific gravity of these two raw materials is very different from that of paper fiber. In the papermaking process, its sinking speed is fast, and it is difficult to produce a paper-based friction material with uniform composition, resulting in unstable product performance and poor product quality. Difficult to control

[0005] Moreover, everyone knows that the production process of the paper-based friction material hopes to control the performance of the paper-based friction lining so that it is basically consistent with the performance after being attached to the core plate, which requires the paper-based friction material to be impregnated. After the molding agent is basically in the required final state, all the ingredients are in place and in the final content, there is no further chemical reaction and change in density porosity, while in the method disclosed in the above patent, the impregnation of the forming agent is carried out after 60 -80°C heat setting process, in fact, the performance of the paper-based friction lining obtained by this process has not yet been finalized, because the melting temperature of ordinary phenolic resin is above 100°C, and the gel curing temperature is above 150°C. After the process, the paper-based friction lining is pasted on the core plate for thermal curing, and further chemical reactions will occur, and its density and porosity will change. Obviously, this process is difficult to control the quality of the final product