动态硫化法丁腈橡胶/尼龙12热塑性弹性体的制备及性能  

Preparation and properties of nitrile rubber/nylon 12 thermoplastic elastomer by dynamic vulcanization

作　　者：邢立华[1] 伍社毛[1] 张立群[1] 

机构地区：[1]北京化工大学材料科学与工程学院,北京100029

出　　处：《合成橡胶工业》2010年第3期207-210,共4页China Synthetic Rubber Industry

基　　金：山东道恩集团公司资助项目

摘　　要：采用动态硫化法制备了丁腈橡胶（NBR）／尼龙（PA）12热塑性弹性体（TPE），通过Haake密炼机确定了动态硫化时间，表征了TPE的相态结构，考察了NBR／PA12（质量比）、增塑剂种类对TPE性能的影响。并对TPE进行了热分析。结果表明，适宜的动态硫化时间为L0min；TPE具有以PA12为连续相、NBR为分散相的两相结构；随着PA12用量的增加，TPE的拉伸强度和耐油性能有很大的提高，但邵尔A硬度和压缩永久变形也增大，扯断伸长率先减小后又增大，适宜的NBR／PA12为70／30～60／40；邻苯二甲酸二辛酯、液体丁腈橡胶、聚己二酸丙二醇酯3种增塑剂的加入均可降低TPE的邵尔A硬度，提高扯断伸长率，但对耐油性能的影响不大；TPE的熔点高于PA12，熔融焓低于PA12。The nitrile rubber（NBR）/nylon 12 （ PA 12） thermoplastic elastomers （ TPE ） were prepared by dynamic vulcanization. The curing time was determined by Haake internal mixer, and the morpho- logical structure was characterized. The effects of NBR/PA 12 （mass ratio） and plasticizer types on the properties of TPE were investigated, and the TPE was analyzed by differential scanning calorimetry. The results showed that the TPE behaved as two-phase structure with PA 12 as continuous phase and NBR as dispersed phase. With increasing the PA 12 amount, the tensile strength and oil resistance increased obviously, and the Shore A hardness and compression set increased as well, elongation at break initially decreased and then increased, and the appropriate mass ratio of NBR/PA 12 was 70/ 30- 60/40. The Shore A hardness decreased and elongation at break increased with the addition of dioctyl phthalate, liquid nitrile rubber and polypropylene adipate plasticzers, but the oil resistance was not affected . The melting point of TPE was higher than that of PA 12, and the melting enthalpy was lower than that of PA 12.

关 键 词：丁腈橡胶 尼龙12 动态硫化 热塑性弹性体 相态结构 物理机械性能 耐油性能 热分析 

分 类 号：TQ334.9[化学工程—橡胶工业]