Effect of hydrazine dihydrochloride on vulcanisation kinetics of natural rubber by using a rheometer MDR2000

Mooney viscosity is a technical parameter to control the processing performance of natural rubber (nr) compound. by treating nr with viscosity stabilisers,the nr of a relatively constant viscosity can be manufactured. in this paper,the vulcanisation kinetics of constant viscosity natural rubber (cvnr) prepared with hydrazine dihydrochloride and nr was studied by using a moving die rheometer (rheometer mdr2000). the results show that the rate constants of induction and curing period of nr are slightly greater than that of cvnr and the activation energies of induction and curing period of nr are lower than that of cvnr. the activation energy of induction period of nr is reduced by 6.28% and the activation energy of curing period of nr is reduced by 3.09% compared to the activation energies of cvnr. the time tdis of nr and cvnr reduce with increasing curing temperature while the time tdis of nr is shorter than that of cvnr at the same temperature.