Brominated butyl/chlorinated butyl rubber composition and preparation method thereof

The invention relates to a brominated butyl/chlorinated butyl rubber composition for gas masks. The composition comprises the following components in parts by weight: 100 parts of rubber matrix, 50-60 parts of carbon black N220, 5 parts of zinc oxide, 0.1-0.5 part of sulfur, 1 part of stearic acid, 1-4 parts of plasticizer (paraffin oil: DOP (dioctyl phthalate): DBP (dibutyl phthalate) is 2: 1: 1), 2 parts of promoter, 1 part of anti-aging agent and 0.5 part of anti-scorching agent, wherein the rubber matrix is composed of brominated butyl rubber and chlorinated butyl rubber. As for vulcanized rubber prepared by using the brominated butyl/chlorinated butyl rubber composition, the tensile strength is 18.50MPa, the elongation at fracture is 539%, the 300% stretching strength is 9.30MPa, the tearing strength is 39.45KN.m, the Shore hardness is 54, the tension set is 10%, and the brittleness temperature is -50 DEG C; and after the vulcanized rubber is aged in hot air (70 DEG C * 72h), the tensile strength is