蛋白酶解产物对天然橡胶硫化特性和物理机械性能的影响  

Effect of enzymolytic product on the curing characteristics and physico-mechanical properties of natural rubber

作　　者：刘士杰 岑月薇 梁晓媚 陈文彬 刘宏超[2] 李永振[2] 桂红星[3] 高天明 LIU Shi-jie;CEN Yue-wei;LIANG Xiao-mei;CHEN Wen-bin;LIU Hong-chao;LI Yong-zhen;GUI Hong-xing;GAO Tian-ming(School of Chemistry and Chemical Engineering,Lingnan Normal University,Zhanjiang 524048,China;Agricultural Products Processing Research Institute,Chinese Academy of Tropical Agricultural Sciences/Guangdong Provincial Key Laboratory of Natural Rubber Processing,Zhanjiang,524001,China;Rubber Research Institute,Chinese Academy of Tropical Agricultural Sciences,Haikou,571101,China)

机构地区：[1]岭南师范学院化学化工学院,广东湛江524048 [2]中国热带农业科学院农产品加工研究所/广东省天然橡胶加工重点实验室,广东湛江524001 [3]中国热带农业科学院橡胶研究所,海口571101

出　　处：《合成橡胶工业》2023年第3期228-233,共6页China Synthetic Rubber Industry

基　　金：岭南师范学院人才专项(ZL 2002);岭南师范学院大学生创新训练项目(1113);广东省天然橡胶加工重点实验室资助项目(2019B121203004);海南省自然科学基金资助项目(2019 RC 288)。

摘　　要：采用离心法制备不同蛋白质含量的天然胶乳,再通过碱性蛋白酶酶解橡胶粒子表面蛋白质,研究了蛋白质酶解产物对天然橡胶硫化特性和动态行为的影响。结果表明,随着离心次数的增加,天然橡胶中氮质量分数由0.27%降至0.13%,生胶复数黏度降低,混炼胶硫化速率变慢,硫化胶交联密度降低,力学性能下降,储能模量在应变和频率扫描下不断降低;由于蛋白质分解产物的作用,天然胶乳经离心加酶处理后,复数黏度高于单纯离心处理的,而且硫化速率加快,力学性能、储能模量均得到提升,尤其是二次离心加酶天然橡胶的硫化速率可达17.8 min^(-1),拉伸强度可达23.73 MPa,明显高于二次离心天然橡胶的9.59 min^(-1)和20.52 MPa。The natural latexes with different protein contents were prepared by centrifugation and then treated by alkaline protease to hydrolyze protein on the rubber particle surface,and the effects of protein hydrolysates on curing characteristics and dynamic behavior of natural rubber were stu-died.The results showed that with the increment of centrifugation times nitrogen mass fraction decreased from 0.27%to 0.13%,complex viscosity of raw rubber and curing rate of compound decreased,cross-linking density and mechanical properties of natural rubber vulcanizates declined,and storage modulus reduced under strain and frequency sweep.However,complex viscosity,curing rate,mechanical properties and storage modulus of natural rubber treated by multi-centrifugation and enzyme increased compared with those of natural rubber treated by only multi-centrifugation,due to the role of protein hydrolysates,and especially for the natural rubber treated by twice centrifugation and enzyme,curing rate could reach 17.8 min^(-1) and tensile strength could reach 23.73 MPa,which were significantly higher than curing rate of 9.59 min^(-1) and tensile strength of 20.52 MPa of natural rubber treated by only twice centrifugation,respectively.

关 键 词：酶解 蛋白质 天然橡胶 硫化特性 动态力学性能 物理机械性能 

分 类 号：TQ331.2[化学工程—橡胶工业]