Constant Viscosity Characteristics of Different NR Constant Viscosity Stabilizers

The effect of several viscosity stabilizers(hydroxylamine hydrochloride,hydroxylammonium sulphate,hydrazine dihydrochloride,hydrazine sulfate,hydrazine hydrate,semicarbazide hydrochloride,aniline) on the Mooney viscosity of NR prepared by biological coagulation technology during storage at room temperature were studied by adding viscosity stabilizers into fresh latex.The results showed that the constant viscosity natural rubber with low-viscosity obtained when the dosage of hydroxylamine hydrochloride,or hydroxylammonium sulphate was 0.05%(relative to the weight of NR).And the constant viscosity natural rubber with medium or high viscosity was obtained when the dosage of hydrazine hydrate was 0.20%～0.30%.The constant viscosity natural rubber will has medium viscosity in case of the dosage of semicarbazide hydrochloride is 0.05% and the constant viscosity natural rubber had low-viscosity with the dosage being 0.10%～0.20%.The constant viscosity natural rubber had medium viscosity if the dosage of aniline was 0.01%～0.03%,and the constant viscosity natural rubber had high viscosity if the dosage of aniline was 0.05%～0.20%.The viscosity of natural rubber was high and unstable when adding hydrazine sulfate or hydrazine dihydrochloride into fresh latex.