RUBBER COMPOSITION CONTAINING ETHYLENE-PROPYLENE RUBBER

The invention relates to a rubber composition containing ethylene-propylene rubber, employed in manufacturing heat-resistant conveyer belts and consisting of 100 parts of polymers comprising 70...100 parts of ethylene-propylene rubber, up to 30 parts of butyl rubber, up to 30 parts of chlorobutyl rubber, up to 30 parts of polyisobutyl rubber an up to 90 parts of additives comprising 30...100 parts of reinforcing black of the HAF type, up to 80 parts of white filler selected from talcum, chalkstone, kaolin and/or calcite, up to 60 parts of medium aromatic oil, up to 60 parts of paraffin oil, the parts being expressed by weight. Additives and vulcanization agents known in the art are added to said composition. The vulcanized rubber mixture has a breaking strain of at least 12.5 N/mm2, a breaking elongation of at least 300% and an abrasion resistance of at most 200 mm3. Inventia se refera la o compozitie de cauciuc cu continut de cauciuc etilen-propilenic, utilizata pentru obtinerea de benzi transportoare rezistente la temperatura, si consta in aceea ca este constituita din 100 parti polimeri formati din 70...100 parti cauciuc etilenpropilenic, pana la 30 parti cauciuc butilic, pana la 30 parti cauciuc clorbutilic, pana la 30 parti cauciuc poliizobutilic si pana la 90 parti aditivi formati din 30...100 parti negru de fum activ de tip HAF, pana la 80 parti sarje albe, alese dintre talc, creta, caolin si/sau calcit, pana la 60 parti ulei mediu aromatic, pana la 60 parti ulei parafinic, partile fiind exprimate in greutate. La aceasta compozitie, se adauga aditivi si agenti de vulcanizare cunoscuti in domeniu. In stare vulcanizata, amestecul de cauciuc are o rezistenta la rupere de minimum 12,5 N/mm2, o alungire la rupere de minimum 300% si o rezistenta la abraziune de maximum 200 mm3.