【作者】 何映平； 孙燕； 谭海生；

【Author】 He Yingping Tan Haisheng Sun Yan(College of Technology , SCUTA, Danzhou Hainan 571773)

【机构】 华南热带农业大学工学院；

【摘要】 采用接枝共聚制备有机硅氧烷接枝改性天然胶乳,着重考察偶联剂种类和用量、引发剂用量、胶乳浓度、反应温度、反应时间和有机硅氧烷种类及用量等对有机硅在接枝共聚反应中的转化率和接枝率的影响,并采用正交设计试验,探索有机硅氧烷改性天然胶乳的适宜工艺条件。结果表明:VD4 接枝改性天然胶乳的转化率和接枝率均比D4 的要高;与其他偶联剂相比,A-171 的接枝率也较高;随着有机硅单体用量的增加、反应时间延长、反应温度升高,有机硅单体的转化率和接枝率都升高。有机硅氧烷改性天然胶乳的适宜工艺条件:胶乳浓度为50%,反应温度为55℃,反应时间为4h,偶联剂A-171 用量为1.2%(占橡胶的质量百分率,下同),有机硅用量为15%,引发剂用量为1.0%。IR 分析表明:有机硅氧烷与天然橡胶分子链存在接枝共聚。更多还原

【Abstract】 The natural rubber latex modified by polyorganosiloxane has been prepared by the method of graft-copolymerization. The effect of the kinds and dosage of coupling agent, latex concentration,dosageNR of initiator,reaction temperature,reaction time and the kinds and dosage of organosilixane to the monomers conversion and monomers graft percent in graft copolymerization reaction have been studied . The suitable technical methods of modification were determined by using the statistical analysis of orthogonal experiment. The results showed that the monomers conversion and monomers graft rate of VD4 was higher than D4 in graft copolymerization reaction; A-171 was the best coupling agent among KH-550,KH-570,A-151 and A-171; the monomers conversion and the graft rate was increased significantly by increasing the ratio of D4or VD4/NR,increasing the reaction time and increasing reaction temperature; the condign technical methods of modification of organosilixane grafting onto NR was attained: the NR latex concentration was 50% , reaction temperature was 55℃, reaction time was 4h, the dosage of A-171 was 1.2%,the dosage of organosilixane was 15% and the dosage of initiator was 1.0%. Polyorganosiloxane definitely grafted onto NR proved by IR.更多还原