| The thermoplastic elastomers have the processing characteristics of a thermoplastic and the functional performance of a conventional thermoset rubber, so they are substituting the conventional thermoset rubber in many fields step by step. Since the AES company industrialized the product of Geolast in 1985, the NBR/PP TPV is catching people's eyes because of its excellent oil resistance, alcohol resistance, heat resistance and better mechanical property, so they are widely used in wires, cables, gaskets, oil seals, spacers and gasoline tank, etc. So it is very important to study NBR/PP TPV.The research idea of choosing and appraising compatibilizer by investigating the compatible effects of uncured NBR/PP blend was brought forward in the paper. TEM, SEM and DSC analysis were used to reflect and value the compatible effects, resulting from the micromorphology , Tg changing and crystallinity of the uncured NBR/PP blend. It was showed that, the compatibilizer that had excellent compatible effects in the uncured NBR/PP blend also could act as good compatibilizer for preparing TPV, because of its outstanding properties. The research idea could be determined to evaluate compatibilizer in the future study, due to its fire-new and simple technology. Effects of three kinds of compatibilizer ATBN/MP,MP and CPP were investigated in the paper, the results showed that, ATBN/MP was the excellent compatibilizer between NBR and PP, resulting in preparing NBR/PP TPV with excellent properties, and the optimal concentration used was5 phr/10phr. Based on this study, the effect of the ratio of rubber to plastic on mechanical properties and oil-resistant property of TPV were investigated systemically. The effects of dynamic vulcanization of NBR/PP blend were investigated in three kinds of vulcanization systems(SP1056,phenolic resin and DCP), respectively. The mechanical property, flow property and oil resistance were very excellent cured by phenolic resin compared with other curing system.The oil resistance, ageing property and dynamic mechanical property were studied for preparing good NBR/PP TPV. In addition, the key and difficult technology, which was high stiffness and poor elasticity of NBR/PP TPV was studied specially. DOP, ointment and liquid nitrile rubber were used as plasticizer in order to reduce the stiffness, improve the elasticity and did not affect other properties of the NBR/PP TPV. It was found that, DOP and polyester could decrease the hardness of TPV markedly. However, DOP was easily drawn out by oil. Fortunately, polyester can stay in rubber phase and almost not being drawn out in the oil condition. So polyester was considered the preferable plasticizer to resolve the above key and difficult technology.
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