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利用型腔体积可控注塑发泡装备制备聚丙烯/无机纳米粒子微发泡复合材料,通过复合材料的流变行为和结晶行为,分析了无机纳米粒子对聚丙烯发泡行为的影响。结果表明:无机纳米粒子有促进气泡异相成核作用,同时无机纳米粒子引入可以提高聚丙烯黏弹响应和降温结晶起始温度,起到了抑制泡孔结构恶化的作用,显著改善了聚丙烯的泡孔结构;在聚丙烯材料中添加纳米CaCO3、纳米OMMT、纳米SiO2进行发泡,以PP/OMMT发泡材料的发泡质量最理想,其泡孔密度和尺寸分别为2×106个/cm3和24.2μm。
Polypropylene / inorganic nanoparticle micro-foamed composite was prepared by controlled injection molding and foaming equipment. The influence of inorganic nano-particles on the foaming behavior of polypropylene was analyzed by the rheological behavior and crystallization behavior of the composites. The results show that the inorganic nanoparticles can promote the heterogeneous nucleation of the bubbles. At the same time, the introduction of inorganic nanoparticles can increase the viscoelastic response of polypropylene and the starting temperature of the crystallization at cooling, play a role in inhibiting the deterioration of the cell structure and significantly improve the Cell structure and foam structure. Foaming of nano-CaCO 3, nano-OMMT and nano-SiO 2 was carried out in polypropylene. The foaming quality of PP / OMMT foam was the best. The cell density and size were 2 × 10 6 / cm 3 And 24.2 μm.