Study on vulcanization characteristics of acid coagulated and microorganism coagulated natural rubber

The vulcanization of two kinds of natural rubber was analyzed by vulcameter.The effects of formula and curing temperature on curing induction period,optimum cure time and maximum torque were studied.The results indicate that the curing induction period and optimum cure time of two kinds of natural rubber(NR) decrease dramatically with increase of curing temperature,and both fit Arrhenius equation well.With the increase of curing temperature,the maximum torque decreases gradually and its trend is well satisfied with linear relationship.As to the formula without carbon black,the MH0 of microorganism coagulated natural rubber(MCNR) is much higher than acid coagulated natural rubber(ACNR).While the MH0 of two kinds of natural rubber increase significantly with the addition of carbon black.But the MH0 of MCNR is slightly lower than ACNR.