蜜胺微球对橡胶硫黄硫化动力学的影响

Effect of melamine formaldehyde microsphere on curing kinetics of rubber with sulfur

以硫黄为硫化体系,将蜜胺微球(MF)分别填充到丁腈橡胶(NBR)和丁苯橡胶(SBR)中,通过傅里叶变换红外光谱(FTIR)分析了MF和2种橡胶的相互作用,考察了MF用量对2种混炼胶硫化特性的影响,并利用Ghoreisy模型研究了硫化动力学。结果表明,MF与NBR之间的相互作用较强,而与SBR之间的相互作用较弱;随着MF用量的增加,NBR和SBR混炼胶的焦烧时间和正硫化时间均缩短,硫化速率和转矩差值均增大,硫化反应活化能均逐渐降低,且相比NBR混炼胶,MF对SBR混炼胶的影响更显著;利用Ghoreisy模型能很好地描述NBR和SBR混炼胶的硫化动力学。

Melamine formaldehyde microsphere （MF） was incorporated into nitrile butadiene rubber （NBR） and styrene butadiene rubber （SBR） with sulfur as curing system respectively. The interaction between MF and two rubbers were analyzed by Fourier transform infrared spectroscopy, and the effects of MF amount on curing characteristics of the compounds were investigated and the kinetics of curing was studied by Ghoreisy＇ s model. The results showed that interaction between MF and NBR were stronger than that of between MF and SBR. With increasing MF amount, the scorch time and curing time of NBR and SBR compounds reduced, the curing rate as well as torque difference increased, and the curing activation energy reduced gradually. In contrast with those of NBR, the properties of SBR compounds could be improved with MF more effectively. The Ghoreisy＇ s model could simulate the curing kinetics accurately.