Method for fabrication of a hybrid dual phase filler for elastomers

A method for fabrication of a hybrid dual phase filler for elastomers based on carbon black and magnetite has been elaborated, the filler includes the carbon black impregnated with ethanol suspension of magnetite in a ball mill, then the dual phase mixture is dried till a constant weight, thereafter the dried product is ground in a ball mill, thermally activated in a reactor designed especially for the purpose, at the end the final product is ground again in a ball mill, the method includes the following steps:

• first stage—preparing the ethanol suspension by pouring ethyl alcohol over powder magnetite and successive homogenizing for 1 h;
• second stage—impregnating carbon black with the suspension obtained at the first stage and successive treatment in a ball mill for 2 h;
• third stage—decanting ethyl alcohol and drying of the obtained dual phase filler at 50° C. for 2 h;
• fourth stage—drying till constant weight at temperature risen to 150° C.;
• fifth stage—grinding the dried product in a ball mill for 2 h;
• sixth stage—thermal activation in a reactor designed especially for the purpose at 440° C. under 10−2 mm Hg vacuum for 2 h;
• and
• seventh stage—grinding of the final product in a ball mill for 2 h.