POLYMERIC ALLOY AND PROCESS FOR PREPARING THE SAME

The invention to a polymeric alloy and to a process for preparing the same. According to the invention, the polymeric alloy is a mixture, subjected to the vulcanization, said mixture comprising 75 ... 100 parts butadiene-nitrile rubber, up to 80 parts plasticized polyvinyl chloride or waste based on plasticized polyvinyl chloride, zinc oxide, stearine, magnesium oxide, antimony trioxide, tetramethyl thiuram disulphide and sulphur, the parts being expressed by weight related to the full amount of the mixture. The claimed process for preparing the polymeric alloy by mixing in a mill or by alligation and milling consisits in mixing plasticized polyvinyl chloride or waste based on polyvinyl chloride in the mill at a temperature ranging from 40 ... 60 degree C or 40 ... 80 degree C, for 10 min, adding additives, a concentrate based on butadiene nitrile rubber milled beforehand, tetramethyl thiuram disulphide as vulcanization accelerators thereby resulting a milled sheet vulcanized by pressing, said material having a tensile strength of 8.5 Mpa. an elongation on break of 400% and a dielectric strenght of 25kV/mm for the resulting material produced by mixing or a tensile strength of 10Mpa, an elongation on break of 600% and a dielectric strength of 30 KV/mm for the material produced by alligation and milling. Inventia se refera la un aliaj polimeric si la un procedeu de obtinere a acestuia. Aliajul polimeric, conform inventiei, este constituit dintr-un amestec care se supune vulcanizarii si care este alcatuit din 75...100 parti cauciuc butadien-nitrilic, pana la 80 parti policlorura de vinil plastifiata sau deseuri pe baza de policlorura de vinil plastifiata, oxid de zinc, stearina, oxid de magneziu, oxid de fier, trioxid de stibiu, tiuram-tetrametil-disulfura si sulf, partile fiind exprimate in greutate si raportate la total amestec. Procedeul de obtinere a aliajului polimeric, conform inventiei, prin amestecare pe valt sau malaxare si valtuire, consta in aceea ca se amesteca pe valt, timp de 10 min, la o temperatura de 40...60 degree C sau 40...80 degree C, policlorura de vinil plastifiata sau deseuri pebaza de policlorura de vinil plastifiata, la care se adauga aditivi, un concentrat pe baza de cauciuc butadien-nitrilic, valtuit in prealabil, acceleratori de vulcanizare constand din tiuram-tetrametil-disulfura si sulf, rezultand o foaie valtuita, care se vulcanizeaza prin presare, material care are o rezistenta la tractiune de 8,5 MPa, o alungire la rupere de