Elastomer composition based on natural rubber for rubber products with improved mechanical properties and stable functional properties and method of producing this composition

Abstract

The subject of the application is an elastomer composition based on natural rubber for rubber products with improved mechanical properties and stable functional properties, which contains rubber, zinc oxide as an activator, stearin as a plasticizer, a crosslinking group containing sulfur and 2,2'-dibenzothiazole disulfide, and as a filler an enzymatic hydrolysate of keratin or a mixture of an enzymatic hydrolysate of keratin and an amino acid, optionally mixed with precipitated silica. The application also covers a method for producing an elastomer composition based on natural rubber, with improved mechanical properties and stable functional properties, with the composition specified above, consisting in introducing into a continuous layer of plasticized rubber produced on the front roll of a rolling mill, in succession, on a per 100 parts by weight of rubber, 5 parts by weight of an activator in the form of zinc oxide, 2 parts by weight of a plasticizer in the form of stearin,a filler in the form of 5 - 10 parts by weight of enzymatic hydrolysate of keratin or in the form of a previously prepared mixture of 4 - 4.5 parts by weight of enzymatic hydrolysate of keratin and 0.5 - 1 part by weight of amino acid, optionally containing additionally 20 parts by weight of precipitated silica and finally a cross-linking group in the form of 2.5 parts by weight of sulphur and 1.5 parts by weight of 2,2'-dibenzothiazole disulphide and after obtaining the mixture of these components in the form of a plate on a rolling mill, the plate is subjected to vulcanization after cooling,