恒粘剂对微生物凝固新鲜天然胶乳制备的恒粘天然橡胶性能的影响

Effect of Constant Viscosity Agents on Properties of Constant Viscosity NR Prepared by Microbial Coagulation of Fresh Natural Latex

研究恒粘剂(盐酸羟胺、硫酸羟胺、水合联胺、盐酸氨基脲和苯胺)对微生物凝固新鲜天然胶乳制备的恒粘天然橡胶(NR)性能的影响。结果表明:随着恒粘NR的盐酸羟胺和硫酸羟胺含量的增大,胶料的t90先延长后缩短,硫化速率(Vc)先减小后增大;随着恒粘NR的水合联胺和盐酸氨基脲含量的增大,胶料的t90延长,Vc减小;随着恒粘NR的苯胺含量的增大,胶料的ts2延长,t90先延长后缩短。随着恒粘NR的盐酸羟胺和硫酸羟胺含量的增大,胶料的300%定伸应力和拉伸强度减小;对于含水合联胺的恒粘NR胶料,随着水合联胺含量的增大,胶料的拉伸强度增大,但小于空白样;当恒粘NR的盐酸氨基脲和苯胺含量为0.05%~0.10%时,胶料可获得较大的拉伸强度和拉断伸长率。

The effect of constant viscosity agents(hydroxylamine hydrochloride,hydroxylamine sulfate,hydrated hydrazine,aminourea hydrochloride and aniline)on the properties of constant viscosity natural rubber(NR)prepared by microbial coagulation of fresh natural latex was studied.The results showed that as the contents of hydroxylamine hydrochloride and hydroxylamine sulfate in the constant viscosity NR increased,the t90 of the compounds first extended and then shortened,and the vulcanization rates(Vc)first decreased and then increased.As the contents of hydrated hydrazine and aminourea hydrochloride in the constant viscosity NR increased,the t90 of the compounds extended,and the Vc decreased.As the aniline content of constant viscosity NR increased,the ts2 of the compound extended,and the t90 first extended and then shortened.As the contents of hydroxylamine hydrochloride and hydroxylamine sulfate in the constant viscosity NR increased,the moduli at 300%elongation and tensile strengths of the compounds decreased.For the constant viscosity NR compound containing hydrated hydrazine,as the hydrated hydrazine content increased,the tensile strength of the compound increased,but it was smaller than that of the blank sample.When the contents of aminourea hydrochloride and aniline in the constant viscosity NR were 0.05%~0.10%,the compounds could achieve larger tensile strengths and elongations at break.