Study on Properties of Three Types of TPV for Automotive Sealing Strip
The mechanical properties,heat resistance,microstructure and thermal-oxidative aging property of three kinds of domestic thermoplastic vulcanized rubber(TPV)products(TPV-1,TPV-2,TPV-3)for automotive seals were studied.The results show that the resin phases of three products may all be block copolymer polypropylene(PP).Among three products,TPV-3 has the highest tensile strength,elongation at break and tear strength,while TPV-1 has the lowest tensile strength and elongation at break.TPV-1 and TPV-2 have similar tear strength,while TPV-1 has the best heat resistance and thermal-oxidative aging property.TPV-3 has the worst heat resistance,while TPV-2 and TPV-3 have similar thermal-oxidative aging property.At a temperature of 70℃,a time of 22 h and a compression rate of 25%,TPV-1 has the highest compression permanent deformation,while TPV-3 has the lowest.At a temperature of 23℃,a time of 72 h and a compression rate of 25%,TPV-1 and TPV-3 have the same compression permanent deformation,while TPV-2 has the smallest compression permanent deformation.
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