RUBBER MIX Russian patent published in 1998 - IPC

FIELD: tire making industry, more particularly rubber mixture based on unsaturated natural rubbers for curing chambers. SUBSTANCE: rubber mix further comprises additive of processed waste from vulcanized rubbers based on saturated natural rubbers, the ratio of components being as follows (wt parts): 80- 85 isoprene rubber; 20-15 butadiene rubber; 0.15-0.25 sulfur; 0.8-1.2 tetramethylthiuram disulfide; 0.7-1.0 2,2-dibenzthiazole disulfide; 4.0-6.0 zinc oxide; 0.3-0.8 stearic acid; 12.0-18.0 oxidized petroleum (rubrax); 4.0- 6.0 rosin; 1.5-2.5 N-phenyl-N-isopropyl -p-phenylene diamine; 0.7-1.3 2,2,4-trimethyl-1.2-dihydroquinoline; 0.4-0.6 phthalic anhydride; 1.0-2.0 modifier (resorcinol- urothropin reaction product; 18.0-22.0 industrial carbon H234; 28.0-33.0 industrial carbon P514; 5.0-30.0 additive from processed waste resulting from vulcanized rubbers based on saturated natural rubbers. The claimed rubber mix increases fatigue endurance and resistance to ageing of vulcanizates and operational endurance of curing chambers. EFFECT: improved properties of the rubber mix. 2 tbl