制备工艺对NR性能的影响  

Effect of Preparation Processes on Properties of NR

作　　者：曾宗强[1,2] 黄茂芳[1,2] 张北龙[1] 梁悦[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开放实验室,广东湛江524001 [2]国家重要热带作物工程技术研究中心,海南海口571700

出　　处：《橡胶工业》2011年第7期422-429,共8页China Rubber Industry

基　　金：国家自然科学基金资助项目(50963006);现代农业产业技术体系建设专项资金资助项目(nycytx-34-GW3);海南省自然科学基金资助项目(807047)

摘　　要：采用新鲜天然胶乳分别制备乙酸凝固NR(NR-1)、微生物凝固NR(NR-2)、乙醇胺混合微生物凝固NR(NR-3)和蛋白酶混合自然凝固NR(NR-4),研究制备工艺对NR性能的影响。结果表明:NR-1和NR-2生胶的耐热老化性能和热稳定性好于NR-3和NR-4生胶;NR-4胶料的MH最大,t90最短,NR-3胶料的MH较小,t90最长;NR-4硫化胶的定伸应力和拉伸强度较大,拉断伸长率较小,NR-1硫化胶的定伸应力和拉伸强度较小;NR-4生胶、混炼胶和硫化胶的弹性转矩(S′)和剪切储能模量(G′)最大,损耗因子(tanδ)最小,NR-1生胶、混炼胶和硫化胶的S′和G′最小,tanδ值最大。Four kinds of NRs were obtained by coagulating the fresh NR latex（NRL） with dif-ferent processes：NRL coagulated by acetic acid（NR-1）,NRL coagulated by microorganism（NR-2）,ethanolamine-blended NRL coagulated by microorganism（NR-3）,and protease-blended NRL coagulated naturally（NR-4）.The effect of preparation processes on the properties of NR was investigated.The results showed that,the raw NR-1 and NR-2 possessed better thermal aging property and thermal stability than the raw NR-3 and NR-4.The MH of NR-4 compound was the highest,and its t90 was the shortest.The MH of NR-3 compound was lower,and its t90 was the longest.The NR-4 vulcanizate possessed higher modulus and tensile strength,lower elongation at break.The NR-1 vulcanizate possessed lower modulus and tensile strength.The raw rubber,compound and vulcanizate of NR-4 exhibited the highest elastic torques（S′） and shear storage modulus（G′） and the lowest loss factors,whereas the lowest S′ and G′ and the highest loss factors were observed from those of NR-1.

关 键 词：NR 制备工艺 物理性能 动态性能 

分 类 号：TQ331.2[化学工程—橡胶工业]