PP-EPDM-SEBS三元体系的动态硫化研究(一)酚醛树脂交联体系.doc

PP/EPDM/SEBS三元体系的动态硫化研究（一） ——酚醛树脂交联剂对性能的影响 阳范文 陈晓明 （广州医学院生物医学工程系 广东广州 510182） 摘 要：系统研究酚醛树脂交联剂用量对PP/EPDM/SEBS动态硫化弹性体性能的影响：随着交联剂用量增加，材料的硬度和拉伸强度呈现先增加然后趋于稳定，断裂伸长率、撕裂强度和MI随之降低，压缩永久形变呈现先降低然后略有增加的变化趋势。通过断裂伸长率、撕裂强度、压缩形变和MI的变化拐点可判断橡胶相是否充分交联，为配方优化提供参考。在交联剂用量为10phr条件下，制备了高温下弹性优异的TPV新材料，70℃和125℃条件下的压缩永久形变分别为23.9％和28.3％，比未添加SEBS时分别降低9.8％和20.7％，复配SEBS对弹性改善效果明显。随着剪切速率增加，材料表观度粘降低，呈现剪切变稀现象。随着酚醛树脂用量增加，表观粘度先增加然后减小，用量为10phr时达到最大值。 关键词：聚丙烯、EPDM、SEBS、动态硫化、酚醛树脂 Research on PP/EPDM/SEBS Dynamic Vulcanization (1): The Effect of Phenol Resin Content on Properties Yang Fanwen Chen Xiaoming （Department of Biomedical Engineering, Guangzhou Medical University. Guangdong, Guangzhou 510182） Abstract: The effect of phenol resin content on properties of PP/EPDM/SEBS dynamic vulcanization was studied. With increase of phenol resin content, the hardness and tensile strength first increased then remain stable, elongation, tear strength and melt flow index (MI) decreased, compression set first decreased then increased. The degree of crosslinking of rubber could be determined by point of inflection of curve about phenol resin content to elongation, tear strength, MI and compression set, which could be used for formula optimization. The PP/EPDM/SEBS vulcanization with 10phr phenol resin was characterized with excellent compression set, which were respectively 23.9 and 28.3% at 70℃ and 125℃. It was lower 9.8% and 20.7% than that without SEBS, which showed SEBS had good effect on elastic recovery. The viscosity of vulcanization decreased with increase of shear rate, which was characterized with shear thinning. With increase of phenol resin content, the viscosity first increased then decreased, maximum value reached at 10phr phenol resin. Keywords: Polypropylene, EPDM, SEBS, Dynamic Vulcanization, Phenol Resin 动态硫化热塑性弹性体(TPV)具有硫化橡胶的高弹性和热塑性塑料的反复加工特性，现已广泛应用于汽车密封、建筑密封和桥梁收缩缝等行业[1-4]。与热固性的EPDM橡胶密封材料相比，TPV具有加工简单、使用方便、节能环保等优点[5-6]。随着汽车整车回收要求的不断提高，TPV在车用密封中的应用日益广泛。努力提高汽车乘坐舒适性和尽量降低车厢内部噪音是汽车行业发展的趋势，对密封材料的弹性回