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首页> 外文会议>International Conference on Blowing Agents and Foaming Processes; 20040510-20040511; Hamburg(DE) >SOFT POLYPROPYLENE FOAMS
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SOFT POLYPROPYLENE FOAMS

机译：软聚丙烯泡沫

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摘要

Seeking for new material solutions, this paper gives a guideline for the development of polypropylene blend systems combining foamability to low densities and pre-adjusted mechanical properties of the foamed sheet. A strong focus is given to the material development for soft, tough and recyclable polypropylene foams. The necessity of making use of long chain branched polymers in order to achieve low density foam is undisputable. Opportunities to improve the softness of polypropylene foams are shown up by the example of blends with propylene/ethylene-copolymers. In this study we will particularly present the results for the foamability of blends of high melt strength polypropylene Daploy~(TM) WB130HMS and Borealis BC250MO block-copolymer, RB501BF random-copolymer, and random-heterophasic copolymers Borsoft~(TM) SA233CF. For foams of comparable densities it is shown, that the tensile modulus and the elongation at break can be controlled by blend design. The ratio of the long chain branched Daploy~(TM) WB130HMS turns out to be the essential parameter for achieving low foam densities, many small cells and closed cellular structures. Thehoice of the suitable copolymer blend partner and the right blend ratio turns out to be essential for the final mechanical properties.
机译：寻求新的材料解决方案，本文为聚丙烯共混体系的开发提供了指南，该体系将起泡性降低至低密度，并预先调整了泡沫板的机械性能。重点放在柔软，坚韧和可回收聚丙烯泡沫的材料开发上。毫无疑问，使用长链支化聚合物以实现低密度泡沫是必要的。通过与丙烯/乙烯共聚物的共混物的例子显示出改善聚丙烯泡沫的柔软性的机会。在这项研究中，我们将特别介绍高熔体强度聚丙烯DaployTM WB130HMS和北欧化工BC250MO嵌段共聚物，RB501BF无规共聚物以及无规多相共聚物BorsoftTM SA233CF的共混物的发泡性结果。对于密度可比较的泡沫表明，可以通过共混物设计来控制拉伸模量和断裂伸长率。长支链的Daploy TM WB130HMS的比例被证明是获得低泡沫密度，许多小孔和闭孔结构的必要参数。合适的共聚物共混物的选择和正确的共混比对最终的机械性能至关重要。

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