The Preparation And Property Research Of EPDM/TPX TPV

In this subject, thermoplastic vulcanizate (TPV) based on ethylene propylene diene monomer (EPDM)/poly-4-methyl pentene-1(TPX) blends were prepared by dynamic vulcanization. The melting point of TPX is as high as 225℃, the main chain of EPDM is saturated and aging resistance performance of EPDM is perfect, vulcanization temperature limit of EPDM is 300℃, so TPX and EPDM can be blended to prepare TPV under the condition of TPX melt. In addition, both EPDM and TPX are nonpolar molecule and the molecular structure of them have a certain similarity, therefore the blend of them can be produced thermoplastic elastomer materials of good mechanical properties and resistance to aging performance.This project studied vulcanization system, reinforcing and compatibilizing system of TPV, and investigetaed processing parameters, the charging sequence and reduplicative mixing property of TPV. The results showed that the strength and elongation at break of TPV at the ratio of 60/40 were high, permanent compression set of TPV at the raio of 60/40 were lower, and it had a good comprehensive property. The TPV crosslinked by sulfur and sulfur donator had the similar tensile strength, but the elongation at break of TPV crosslinked by sulfur donator was bigger, The best dosage of sulfur and sulfur donator was o.4 phr and 1.5 phr. The property of TPV that the sulfur added in mixer after the good blend of EPDM and TPX was better than that the sulfur added in EPDM first. The property of TPV that accelerated by DM was better than that accelerated by CZ. The compatibilizer could improve tensile strength and elongation at break of TPV greatly, and the the hot oxygen aging performance of TPV was improved too. The carbon black can improve the strength of TPV, but the elongation at break of TPV decreased. With the increase of carbon black dosage, the Payne effect of TPV became more obvious. When the blending temperature was 230℃ and the rotate speed was 70 r/min, TPV had good performance. After three times of reduplicative mixing, the performance of TPV reduced slightly. The TPV had a better reduplicative mixing property.