几种低粘度恒粘天然橡胶的性能研究

采用盐酸羟胺、硫酸羟胺、盐酸氨基脲和促进剂M作为恒粘剂分别制备了天然橡胶（NR）-HH，NR-HS，NR-SH和NR-MB低粘度恒粘NR，并研究NR的理化性质、贮存性能、硫化特性和物理性能。结果表明：与未采用恒粘剂的NR-CK相比，4种恒粘NR的塑性初值稍小，NR-MB的塑性保持率明显降低；NR-MB胶料的硫化速度大于NR-CK胶料，NR-HS，NR-HH和NR-SH胶料的硫化速度则小于NR-CK胶料；NR-HH，NR-HS和NR-SH硫化胶的拉伸强度和撕裂强度相当，均低于NR-CK硫化胶，而NR-MB硫化胶的拉伸强度和撕裂强则高于NR-CK硫化胶。几种恒粘剂均能有效降低NR的门尼粘度，改善其耐热空气老化性能，其中盐酸羟胺和硫酸羟胺对NR的恒粘效果较好。;Several kinds of constant viscosity natural rubber（NR） with low viscosity（NR-HH，NR-HS，NR-SH and NR-MB） were prepared with hydroxylamine hydrochloride，hydroxylammonium sulphate，semicarbazide hydrochloride and accelerator M as viscosity stabilizer，respectively，and their physicochemical properties，storage performance，curing behavior and physical properties were studied. The results showed that，P0 values of NR-HH，NR-HS，NR-SH and NR-MB were lower than that of NR-CK，and PRI of NR-MB was significantly lower compared with that of NR-CK. The curing rate of NR-MB compound was faster than that of NR-CK compound，and the curing rates of NR-HS，NR-HH and NR-SH compound were slower than that of NR-CK compound. The tensile strength and tear strength of NR-HH，NR-HS and NR-SH vulcanizates were equivalent and all worse than those of NR-CK vulcanizate，but the tensile strength and tear strength of NR-MB vulcanizate were higher than those of NR-CK vulcanizate，respectively. All these viscosity stabilizers could effectively decrease the Mooney viscosity of NR and improve the hot air aging resistance. Among them，hydroxylamine hydrochloride and hydroxylammonium sulphate showed a better effect on the stabilization of NR viscosity