METHOD OF PREPARING RUBBER MIX Russian patent published in 1997 - IPC

FIELD: rubber industry, more particularly preparation of porous vulcanizates. SUBSTANCE: hydrolysis polyurethane is first mixed with organic "ЧХЗ-21" or "ЧХЗ-57" at 40-140 C for 0.25-1.5 h. 1.0:0.26-1.6 by weight are then mixed with other ingredients. Rubber, antiagers, vulcanizing sulfur-free group. Industrial carbon, plasticizer and sulfur are added, and vulcanization is carried out in molten salts at 230 C for 15 minutes. Hydrolysis polyurethane includes polyurethane hydrolysis waste products. Chloroprene rubber based vulcanizates have rigidity of 0.1-10.13 MPa, density of 300-380 kg/cu. m residual compressive strain of 27-35 % ozone resistance of 53-64 h. EFFECT: more efficient preparation method. 4 tbl