天然橡胶/牡蛎壳粉复合材料的硫化特性

Cure Characteristics of Natural Rubber / Oyster Shell Powder Composites

用稀土偶联剂对牡蛎壳粉进行改性,通过与天然橡胶共混制备天然橡胶/牡蛎壳粉复合材料。采用粒度分析仪测定牡蛎壳粉粒径及其分布,用红外光谱表征复合材料的微观结构,并研究了复合材料的硫化特性。结果表明,牡蛎壳粉的粒径在150~275 nm范围,平均粒径为209 nm,复合材料的红外光谱保留了牡蛎壳粉和天然橡胶的特征吸收。在硫化时,随着偶联剂用量的增加,复合材料的转矩值减小,焦烧时间和正硫化时间延长。而牡蛎壳粉的加入使复合材料的转矩值增大,焦烧时间和正硫化时间增加,硫化返原现象消失。总体来说,牡蛎壳粉的加入改善了复合材料的硫化性能。

The oyster shell powders were modified by rare earth coupling agent and mixed with natural rubber to prepare the natural rubber / oyster shell powder composites. The particle size and distribution of the oyster shell powders were determined with particle size analyzer,and the microstructures of the composites were characterized by using the FTIR to analyze the cure characteristics of the composites. The particle size of the oyster shell powder was found 150- 275 nm,averaging 209 nm. The composites kept the FTIR absorption features of both the oyster shell powder and the natural rubber. In vulcanization,the torque values of the composites decreased,but the scorch and optimum cure time of the composites increased with the increase of the rare earth coupling agent.The torque values and the scorch and optimum cure time of the composites increased when mixed with the oyster shell powder,and the reversion process of cured natural rubber disappeared. Overall,the curing performance of the composites was improved by adding the oyster shell powder.