核磁共振法研究炭黑/白炭黑并用比对胶料交联密度的影响

用核磁共振（NMR）法（仪器为NMR法交联密度测试仪）研究炭黑/白炭黑并用比对胶料交联密度的影响。结果表明：NMR法测试胶料交联密度，可反映炭黑和白炭黑与橡胶的作用；采用NMR法试测试的胶料交联密度对炭黑/白炭黑并用比变化敏感；炭黑用量增大，硫化胶的交联密度增大；偶联剂Si75能减少白炭黑与炭黑之间的作用，促进白炭黑分散，消除和减轻白炭黑用量较大导致的胶料硫化延迟。

Study on Effect of Carbon Black/Silica Ratio on the Rubber Cross-linking Degree Using NMR

This paper researches the effect of the carbon black/silica content for the crosslinking density of rubber. The result shows that the NMR Test for crosslinking density is sensitive enough to characterize the change of carbon black/silica, and the crosslinking density raises as the carbon black increases. It also indicates the reaction process of carbon black and silica in rubber. And by using Si-75, the interaction between silica and other fillers can be decreased and the silica can disperse better in rubber. The relay-vulcanizing effect caused by high content of silica can also be restrained.