环氧化天然橡胶硫化反应动力学参数的拟合  

Fitting of Cure Reaction Kinetics Parameters Based on Epoxidized Natural Rubber

作　　者：杨昌金[1] 罗勇悦[1] 陈帮乾[2] 许逵[1] 钟杰平[3] 王凤祥[1] 彭政[1] 

机构地区：[1]中国热带农业科学院农产品加工研究所,农业部热带作物产品加工重点实验室,广东湛江524001 [2]中国热带农业科学院橡胶研究所,海南儋州571737 [3]广东海洋大学理学院,广东湛江524088

出　　处：《广州化工》2014年第9期42-44,共3页GuangZhou Chemical Industry

基　　金：中国热带农业科学院橡胶研究所基本科研业务费专项资助(1630022013021);广东海洋大学自然基金资助(课题编号:1312441)

摘　　要：以2-硫醇基苯并噻唑(M)、N-叔丁基-2-苯并噻唑次黄酰胺(NS)、二硫化四甲基秋兰姆(TMTD)硫为促进剂,采用流变仪测定的环氧化程度为25的环氧化天然橡胶(ENR 25)的硫化曲线,通过用硫化动力学模型和origin 7.5软件对ENR25的硫化曲线进行非线性拟合,计算出ENR25硫化动力学参数,探讨了硫化温度对添加3种不同促进剂硫化的环氧化天然橡胶硫化动力学参数的影响。研究结果表明,选用促进剂NS硫化的ENR25,硫化先驱体形成交联键的反应活性较多,硫化活性中间体形成交联键的趋势较强,交联键降解的速率常数较小,是ENR25的最佳促进剂;交联键的降解反应对硫化温度的依赖性强于硫化先驱体分解反应对温度的依赖性。The cure curves of epoxidized natural rubber with 25mol% epoxidation（ ENR25） cured with 2-mercaptobenzothiazole（ M） tetramethylthiuram disulphide（ TMTD） and N-tert-butyl-2-benzothiazyl sulphenamide（ NS） was determined by Moving Die Rheometer（ MDR 2000）. The cure curves of curing and overcure periods for ENR25 were then non-linear fitted by a cure reaction kinetics model and Origin7. 5 software and the cur kinetic parameters were calculated. Effect of cure temperature on the parameters of ENR25 cured with different accelerator was discussed. It showed that the ENR25 with accelerator NS had higher rate constant for formation of activated crosslinking precursors,the lower rate constant of crosslinkage decomposition reaction. The tendency for formation of crosslinkage from activated intermediate decreased for ENR25 added with accelerator NS. NS was the best choice for ENR25. The cross linkage decomposition reaction had more influence on cure temperature than that of precursor decomposited to intermediate.

关 键 词：促进剂 环氧化天然橡胶 硫化动力学 非线性拟合 

分 类 号：TQ332.14[化学工程—橡胶工业]