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通过改性的不同形状(针状MgSO4晶须、片状云母粉、球形状SiO2)无机粉体材料,以5%含量加入到聚丙烯中,在二次开模条件下制备微发泡PP复合材料;测定PP/无机粉体材料复合体系接触角,联合粘接理论计算液-固界面的黏附功;以异相成核理论和填充增强机理为基础,分析了不同形状的无机粉体材料对微发泡PP材料力学行为的影响规律。结果表明:PP/云母粉复合体系发泡后冲击强度提高比例达到79%,弯曲强度和拉伸强度比纯PP未发泡材料的强度还高,但比相应未发泡PP复合体系有所降低。这充分说明了在材料成本降低基础上综合性能得到提高;片状云母粉是微发泡PP复合材料的理想填料。
Through the modification of different shapes (acicular MgSO4 whiskers, flaky mica powder, spherical SiO2) inorganic powder material, added to the polypropylene content of 5%, in the second mold conditions prepared micro-foam PP composite Materials; Determination of contact angle of PP / inorganic powder composite system, combined with adhesion theory to calculate the liquid-solid interface adhesion work; Based on heterogeneous nucleation theory and filling enhancement mechanism, the analysis of different shapes of inorganic powder material pairs Influence laws of mechanical behavior of micro foaming PP material. The results showed that the impact strength of PP / mica powder composite system increased by 79%, flexural strength and tensile strength were higher than those of unplasticized pure PP, but lower than that of corresponding unfoamed PP composite . This fully demonstrates that the comprehensive performance is improved on the basis of the reduction of the material cost; flaky mica powder is an ideal filler for the micro-foamed PP composite material.