活性硅酸钙填充天然橡胶复合材料性能的研究

以无定形活性水合硅酸钙、炭黑、白炭黑为填料,使用硅烷偶联剂对其改性,采用熔融共混法制备了天然橡胶复合材料,并考察了改性剂种类、改性剂添加量、硅酸钙添加量、硅酸钙与炭黑、白炭黑的配合比例对天然橡胶复合材料硫化性能、力学性能的影响.结果表明:与炭黑、白炭黑传统填料相比,硅酸钙粉体具有降低胶料扭矩、缩短硫化时间的作用；填充硅酸钙后,天然橡胶的拉伸及撕裂强度有不同程度降低,但在填充50份4％S基改性的硅酸钙后,复合材料的100％、300％定伸强度与50份炭黑填充时相当；硅酸钙与白炭黑配合填充时,复合材料的拉伸强度和撕裂强度在比例为1∶3、1∶1时各自达到最大值11.31 MPa、23.93 N/mm,优于白炭黑单独填充.

Study on properties of nature rubber filled by active calcium silicate

Abstract: A series of nature rubber (NR) composites based on carbon black, silica, and active calcium silicate modified by silane agents were prepared by melt blending. The effect of modification agent types and quantity, powder supply rate, filler combination on the mechanical properties of the rubber composites were researched. The vulcanizing torque and curing time were obviously reduced compared with rubbers with silica or carbon black. The tensile strength and tear strength of rubber with active calcium silicate decreased compared with the pure rubber. But the tensile strength at 100% and 300% of NR composites filled by 50 portion active calcium silicate were equivalent to composites filled by 50 portion carbon black. The tensile strength and tear strength of composites respectively reached the maximum value 11.31 MPa and 23.93 N/mm when the combination proportion of active calcium silicate and silica were 1:3 and 1:1, which were superior to composites filled by silica alone.