Study On Preparation And Properties Of EPDM/PP Thermoplastic Elastomer By Dynamic Vulcanization

EPDM / PP thermoplastic elastomer which is prepared by dynamic vulcanization has excellent weather resistance, good high temperature properties, electrical properties, oil-resistant and solvent-resistant properties.As the development of auto and cable industry, the application of EPDM/ PP thermal plastic elastomer becomes wider. However the research of EPDM/ PP thermal plastic elastomer in Domestic is slower than in developed countries. So the research of dynamic vulcanization in producing high performance EPDM/ PP thermal plastic elastomer is significant and promising.First, the dynamic vulcanizate EPDM/ PP blends with different content of DCP have been studied. The effects of the content of DCP on the structure and properties of the dynamic vulcanizate EPDM/ PP blends have been researched by the test of cross linking density, melt index, tensile, abradability, SEM, DSC, and TG. It has been showned by SEM that in the dynamic vulcanization of EPDM/ PP melt blend, cross-linked EPDM particles are adequate distribution in PP, known as the typical two phase structure. When the dosage of DCP is two, its combination property is best.In order to promote the mechanical property of EPDM/ PP thermal plastic elastomer, the influence of moderate sulfur(S), as a substitute for TAIC which acted on a crosslinking coagent, on property was investigated, when the DCP dosage was fixed. And the effect of S content on morphological structure and property of EPDM is also studied and the result shows that S is effective coagent. 0.1 dosage of S has the function of one dosage of TAIC. When S dosage is 0.3, the mechanical property and system intensity is not obviously changed. But tensile-strength increases, then decreases. And the system tensile-strength is promoted to 13.97Mpa compared to those without S.After the determination of best sulfurizing system, the paper focuses on the impact of rubber ratio on the morphological characteristics and property of EPDM through change the rubber ratio. And the result shows that the cross-linking density, hardness, intensity and processing liquid of composite are improved as the rubber ratio decreases, and its resiliency and elongation rate decrease.Finally, the influence of the quantity of CNTs on the morphological characteristic and property of EPDM/ PP (TPV) is also been tested. Through the test of SEM and mechanical property, the result indicates that when one dosage of CNTs is added, the mechanical working property and mechanical property of composite have been improved.