HEAT-RESISTANT RUBBER MIXTURE Russian patent published in 2013 - IPC C08L9/02 C08K13/02 

FIELD: chemistry.

SUBSTANCE: invention relates to production of rubber mixtures used to make elastic rubber elements used in manufacturing packer and anchor equipment for the oil industry. The heat-resistant rubber mixture based on a combination of butadiene-nitrile rubber and partially hydrogenated butadiene-nitrile rubber, contains a curing agent, a peroxide curing co-agent, zinc oxide, a process additive for rubber mixtures and technical carbon. The mixture contains as a curing agent - novoperox BP-40, as a peroxide curing co-agent - deltagran HVA-2 70 OH, as a process additive for rubber mixtures - softener RS-1 and additionally 2-mercaptobenzothiazole, burnt magnesia, stearic acid, naugard 445, novatox 8PFDA, zincolet VV-222, technical carbon N 220, technical carbon P 514, oligoether acrylates MGF-9 and TGM-3, with the following ratio of components, pts.wt: butadiene-nitrile rubber - 15.0-25.0; partially hydrogenated butadiene-nitrile rubber - 75.0-85.0; novoperox BP-40 - 10.0-11.0; deltagran HVA-2 70 GE - 1.5-2.0; 2- mercaptobenzothiazole - 0.3-0.5; zinc oxide - 3.0-5.0; burnt magnesia - 8.0-10.0; stearic acid - 0.5-1.0; zincolet VV-222 - 1.0-2.0; softener RS-1 -1.0-2.0; naugard 445 -1.0-3.0; novatox 8PFDA - 1.0-3.0; technical carbon N 220 - 15.0-20.0 technical carbon P 514 - 50.0-55.0; oligoether acrylates MGF-9 - 8.0-12.0; oligoether acrylates TGM-3 - 8.0-12.0.

EFFECT: improved elastic-strength properties of the vulcanisate at temperature of 150°C, providing sealing capacity of rubber elements of packer and anchor equipment, high tear resistance, high operating capacity of the rubber element at high temperatures.

1 cl, 1 tbl