Process for producing friction material through two-step method
A friction material and production process technology, applied in the field of two-step production of friction materials, can solve the problems of non-wearability of friction materials, insufficient mixing of resin and other materials, and unstable friction coefficient, so as to avoid air bubbles and reduce gas generation. , The effect of material mixing is sufficient
Pending Publication Date: 2019-11-01
ZHEJIANG HANGMO SYNTHETIC MATERIAL
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Problems solved by technology
[0008] The invention provides a two-step production process for producing friction materials, which solves the problems of insufficient mixing of resin and other materials in the existing process, resulting in non-wear-resistant friction materials and unstable friction coefficients
Method used
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Embodiment
[0041] (1) In a constant temperature and humidity environment with a relative humidity of ≤70% and a temperature of ≤25°C, fully mix the friction material raw materials (the phenolic resin contains 6% urotropine) in a ball mill according to the ratio shown in Table 1 (The time is about 30 minutes), and the mixed material is obtained.
[0042] (2) Send the mixed material into the double-roller rubber mixer for refining, and the steam pressure of the high-temperature roller is controlled at 4-5Kgf / cm 2 , Low-temperature rollers Control the roller temperature at about 80°C by controlling the outlet water temperature, and measure the curing degree of the bonding resin according to the following method within a fixed time. After the bonding resin reaches the curing degree shown in Table 2, the kneading ends.
[0043] (3) After refining, the material becomes flakes and needs to be cooled quickly (generally within 2 minutes) to 25°C or below by water cooling to keep the solidified ne...
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Abstract
The invention discloses a process for producing a friction material through a two-step method. The process comprises the following steps that (1) raw materials, including bond resin, of the friction material are mixed to obtain a mixed material; (2) open milling is performed on the mixed material, opening milling is finished until the curing degree of the bond resin reaches 10%-40%; (3) the mixedmaterial subjected to open milling is cooled to room temperature or below, and granulating is performed to produce material particles; and (4) hot press molding is performed on the material particles,and heat treatment is performed to produce the friction material. According to the process, open milling is performed on the mixed raw material firstly, the bond resin can be melted in the open milling process, by utilizing the adhesion and the wettability of the bond resin, the materials can be mixed more sufficiently and uniformly, and the problems of hollowing and layering due to the non-uniform mixing of the materials are solved; and through open milling heating, the bond resin can be cured under the action of a curing agent, so that the gas forming amount in the pressing process of the mixed material is reduced, and the situation that gas bubbles are generated due to insufficient degassing is avoided.
Description
technical field [0001] The invention relates to the technical field of friction materials, in particular to a two-step process for producing friction materials. Background technique [0002] Friction material is a composite material with phenolic resin as binder, its main components are resin binder, reinforcing fiber and filler, which belongs to the composite material combining inorganic and organic polymers. Friction materials are mainly used as functional accessories for braking and parking in sports equipment and equipment, and can be divided into brake linings and clutch plates according to their functions and installation locations. Friction materials are required to have certain heat resistance and mechanical strength, and have good friction coefficient and wear resistance under the condition of meeting the transmission and braking performance requirements of vehicles or machinery. [0003] The mixing methods of friction materials mainly include dry mixing and wet mi...
Claims
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IPC IPC(8): B29B7/00B29C43/00
CPCB29B7/002B29C43/00
Inventor 孟付良周大鹏唐敏苏勋陈建国叶煜霞杨磊尹飞阳
Owner ZHEJIANG HANGMO SYNTHETIC MATERIAL