SU541358A1 - Vulcanizable rubber compound - Google Patents

Description

The invention relates to the rubber industry, in particular to the development of a rubber mixture for friction materials operating in the friction units for mill steel. Known vulcanizable rubber compound l to obtain friction materials, including, weight. %: Carbon chain rubber 10-19 Vulcanizing group 2-3 Barite 51-65 Asbestos17-30 However, this composition has a low and unstable coefficient of friction. A vulcanizable rubber mixture for producing rubber of friction purpose is known, which includes, in addition to the components of the rubber mixture, also a metal oxide, for example copper. The rubbers from these mixtures are characterized by very frictional properties, namely, they have a low coefficient of friction and a defect of spreading friction (the metal partially passes to the surface of friction rubber friction). In order to improve the frictional properties of rubber, namely to increase the coefficient of friction and eliminate the spreading defect, it is proposed to introduce oxide, dioxide or nitrous oxide of margand into the mixture and, additionally, poldiene, with the following ratio of components, weight,%: Carbozzan rubber16-19 Vulcanizing group 3-5 Manganese oxide 0.5 -13 Pohshadena 0.5-2 Asbestos35-47 Barite-26-44 Nitrile rubber (SKN-26M), styropy saychuks (ARKP and SKMS-ZO RP), stereo-regular butadiene rubber (SKD), and their combinations are used as rubber. POTOBSIT rubber compound in the usual way in a rubber mixer. The components are mixed with complete cooling of the chamber and the rotors for 16 minutes. the discharged mass is crushed in a disintegrator, molded in a mold, where the metal frame is preliminarily placed, at a temperature of 190-2OO C, specific pressure 63О kg / cm and holding for 15 minutes. In tab. 1 shows the formulations of the proposed rescan mixture. Table Rubber SKN-26M. Rubber SKS-30 ARKP Rubber SKD 3.2453.245, 3.2 Sulfur 0.17 0.17 0.1 Kaptax 0.0850.0850.0 Tiuram Zinc oxide 444 1.5 Manganese oxide Manganese oxide Conventional rubber testing for defecation spreading on a tinker friction machine .2 Specific pressure, kg / cm2 Friction speed, m / s7 Temperature, Material counterbody-steel St.3 54 8.4 The properties of the recoating material and the proposed mixtures are presented in Table. 2 Table 2 Hardness not determined by Brinell with 19-23 load 50Okg Coefficient 0.45-0.47 0.56-0.60 friction Wear for 0.21-0.24 0.10-0.11 2 h, mm Test conditions for a smearing defect on a final friction machine: Specific pressure, kg / cm9 Friction speed, m / s 7.5 Temperature, ° С 15О-ЗОО Time, h1 For the rubber from the known mixture, the transition of metal to the surface of friction rubber friction is observed. In the rubber from the proposed mixture, no transition of the metal to the friction surface of the firschionny material is observed (no smearing defect, the surface is clean). When assessing the performance of rubber from the known and proposed mixtures in the full-scale assembly of the SHPM-7.pO coupling on the U2-4-5 winch, the data presented in Table 2 are obtained. 3. Table 3

Friction coefficient

The temperature of the friction plate, C

Performance

Oh 35

100

Claims (2)

The material withstands the entire test cycle, i.e., 12O inclusions. The obtained rubbers of the proposed vulcanizable mixture are characterized by their worn frictional properties (have a high coefficient of friction, do not have a smearing defect of the front rubber surface). Claims: Vulcanizable rubber compound for the production of friction rubber on a rubber basis, including carbon chain rubber, a kanis group, asbestos, barite, and a metal oxide, characterized in that, in order to improve the friction properties of rubber from this mixture, it contains ice, oxide, or two manganese and additionally polydipri in the following ratio comonen, wt.%: Carbon chain rubber 16-19 Vulcanizing group 3-5 Asbestos 35-47 Barite 26-44 Manganese oxide, or manganese dioxide, or for 0, 5-13% manganese Polydiene 0.5-2 Inform sources Accepted in the examination: 1. USSR author's certificate 427952, cl. From OSd 13/36, 1974. 2. Authors certificate of the USSR 462485, cl. C 08 g 37/08 ,, 1974.