Microporous rubber base plate and preparation process thereof

The invention belongs to the technical field of microporous rubber and discloses a microporous rubber base plate and a preparation process thereof. The microporous rubber base plate has the major technical characteristic that the microporous rubber base plate body is prepared from the following components in parts by weight: 100 parts of ethylene-propylene-diene rubber, 6-18 parts of polyethylene glycol mixture, 60-100 parts of a filling material, 30-60 parts of alkane oil, 6-12 parts of a foaming agent, 2.5-5.5 parts of a vulcanizing agent and 2-5.5 parts of an accelerant. According to the microporous rubber base plate, an evenly diffused multi-phase structure is formed by mechanically blending low-Mooney EPDM and high-Mooney EPDM, and in combination with benzenesulfonic acid formed in the reaction process of neutralizing the foaming agent 4,4-oxodibenzenesulfonyl hydrazide by use of the polyethylene glycol mixture, the foaming ratio can be increased. In addition, accessories carbon black excellent in reinforcement property and porous diatomite filler excellent in aging property and light in weight are adopted, and consequently, the microporous rubber base plate has such properties as high strength, low rigidity and low temperature dependency.