粘土/NBR纳米复合材料的结构与性能研究

采用共絮凝粘土水悬浮液与NBR胶乳共混的方法制备了粘土／NBR纳米复合材料。透射电子显微镜观察表明粘土具有平面取向的纳米分散结构；X光衍射测试表明复合材料中还存在一定量的粘土片层聚集体；随着粘土用量的增大，复合材料的邵尔A型硬度、100％定伸应力、300％定伸应力、拉伸强度和扯断永久变形增大，扯断伸长率变化不大；粘土／NBR纳米复合材料的耐老化性能略优于白炭黑／NBR硫化胶；粘土可提高复合材料的气体阻隔性能，但对复合材料的氧指数影响不大。

Study on structure and properties of clay /NBR nano-composite

A clay/NBR nano-composite was prepared by blending co-flocculated clay suspension in water with NBR latex. It was found by TEM and X-ray diffraction that the clay possessed nano-disper-sion structure orientated in plane and there were some laminal clay aggregates in the composite. The properties of clay/NBR nano-composite were investigated. The test results showed that as the proportion of clay increased, the Shore A hardness, modulus at 100% elongation, modulus at 300% elongation, tensile strength and tensile-permanent set of the composite increased and the elongation at break changed little; the aging property of clay/NBR composite was somewhat superior to that of silica/NBR compound;and the clay improved the air-tightness of composite,but showed little effect on the oxygen index of composite.