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以低密度聚乙烯(LDPE)为基体原料,乙烯-辛烯共聚物(POE)为增韧材料,采用密炼塑化、双辊混炼、模压发泡方法制备高发泡弹性材料。用智能型发泡无转子硫化仪分析POE对LDPE正硫化时间、扭矩值、发泡气体压力的影响,用扫描电镜观察POE与LDPE之间的相结构以及发泡后泡孔孔径的影响,测试了LDPE/POE发泡材料的物理力学性能。结果表明:随着POE含量的增加,其复合材料正硫化时间延长,扭矩值和发泡气体压力增大;POE在LDPE材料中形成“海-岛”结构两相体系;含40质量份POE的LDPE/POE发泡材料孔径均匀性较好,与LDPE发泡材料相比,拉伸强度提高67.2%,断裂伸长率提高82.3%,直角撕裂强度提高25.1%,回弹率提高8%,物理力学性能优良。
Using low density polyethylene (LDPE) as matrix material and ethylene-octene copolymer (POE) as toughening material, the high foaming elastic material is prepared by means of close plasticization, two-roll mixing and mold foaming. The effect of POE on the vulcanization time, torque value and foaming gas pressure of LDPE was analyzed by a smart foaming rotorless rheometer. The phase structure of POE and LDPE was observed by scanning electron microscopy, Physical and mechanical properties of LDPE / POE foams. The results show that with the increase of POE content, the curing time of the composite increases, the torque value and the pressure of foaming gas increase. POE forms a “sea-island” two-phase system in LDPE material. Compared with LDPE foamed material, the tensile strength of POE LDPE / POE foamed material is better than that of LDPE foamed material by 67.2%, elongation at break by 82.3%, right-angle tear strength by 25.1% and rebound rate by 8 %, Excellent physical and mechanical properties.