PHYSICAL MODIFICATION OF RICE HULL CARBONIZATE TO IMPROVE ITS INTERACTION WITH RUBBER MATRIX

Abstract

In this work, the effect of different types of modifications of rice husk carbonizate (RHC) on interphase and interaggregate interactions in the volumes of rubber matrices was studied. RHC was modified by ionizing radiation (g-quanta) using an interdose interval of 10 kGy, as well as in a planetary ball mill in dry and liquid environment (ethanol and water) with different exposure times of impact forces. Modified RHC samples were characterized using method of laser diffraction and gas adsorption with multipoint determinations (BET method). The production of model elastomer compositions based on special (BNKS-18AMN) and general (SKI-3) destination rubbers containing modified carbonizate was carried out on laboratory mills according to a standardized method with a complete replacement of low-reinforcing technical carbon of the N772 brand. To study the interactions between the RHC and the rubber matrix, the content of bound rubber and the quality of dispersion of the components in the volume of the rubber mixture were determined. It was found that irradiation of the RHC with ionizing radiation and its grinding in an aqueous medium, leads to deterioration of the physicochemical characteristics of the RHC’s surface and a decrease in its interaction with the rubber matrix. At the same time, it was found that modification of RHC on a planetary mill in a dry environment with cooling intervals from 6 to 15 minutes, as well as in an ethanol environment for 30 minutes, contributes to an increase in interphase interaction and a decrease in the Payne effect due to an increase in the specific surface area and a decrease in the particle size of the studied material compared to RHC without treatment.