炭黑对国产钕系稀土顺丁橡胶加工性及性能的影响

Effects of carbon black on processability and properties of neodymium catalyst based domestic cis-1,4-polybutadiene rubber

研究了炭黑用量及部分掺混白炭黑对钕系稀土顺丁橡胶(NdBR)加工性及性能的影响。结果表明,炭黑填充的NdBR在混炼过程中吃药较快,胶料包辊情况良好,下片光亮平整。填充胶具有较高的链结构规整度,线性好,因此具有较好的拉伸性能、耐磨耗性能和回弹性。随炭黑填充量增加,NdBR混炼胶的门尼黏度升高,正硫化时间和焦烧时间缩短;硫化胶的抗湿滑性能改善,压缩生热升高,回弹性及耐屈挠性能变差。白炭黑对缩短NdBR的硫化时间及提高其力学性能有利,但导致其硬度升高,回弹性与耐磨耗性能下降。

The effect of carbon black amount and partly blended silica on the processability and prop- erties of neodymium catalyst based domestic cis-1,4- polybutadiene rubber （NdBR） which was made in Dushanzi Petrochemical Company was studied. The results showed that in the process of mill mixing, the carbon black and other ingredients were easier to ho- modisperse in NdBR matrix, the rubber compound was better in mill banding, and the appearance of compound sheet was bright and smooth. Owing to the higher structure regularity and better linearity in molecular chain, the carbon black filled NdBR has better tensile property, abrasion resistance and resilience, and with increasing amount of carbon black, the Mooney viscosity increased, the optimum cure time and scorch time of NdBR compound got short- ened, while the wet skid resistance got better, resili- ence and flex resistance deteriorated for NdBR vulcanizates. The silica could shorten the cure time and enhanced the mechanical properties of NdBR, but raise Shore A hardness and reduce the resilience and abrasion resistance of NdBR vulcanizates.