Pengaruh penambahan bahan pengisi alumunium silikat dan bahan pengembang azodicarbonamide dalam pembuatan karet mikroseluler untuk sol ringan

The aim of the research was to investigate the effect of the added aluminium silicate filler and Azodicarbonamide (AZDM) blowing agent on production of microcellular rubber for light sales. The formula of microcellular rubber consist of ethylene vinyl acetate (EVA) 80 phr, natural rubber (SIR 3 L) 20 phr, stearic acid 0,5 phr, zink oxide 1 phr, aluminium silicate 15 phr, AZDM 1,5 phr and dicumyl peroxide 0,8 phr. The best formula phr and AZDM blowing agent of 1,5, 2 and 2,5 phr, respectively. The vulcanization process was carried out at 160 ? 165o C for 20 minutes and molding on 100 kg/cm2 pressure. The results showed that the best microcelluler rubber was produced by using the formula of aluminium silicate filler of 20 phr and AZDM blowing agent of 1,5 phr. The microcelluler rubber performed physical properties such as tensile strength 42,75 kg/cm2, elongation at break 204%, Grasselli abrasion resistance 2,79 mm3/kg.m, hardness 50,6 shore A, compression set 33,12% and specific gravity 0,34 g/cm3, while signs of cracking was not performed.