超细碳酸钙颗粒形态对PVC复合材料性能的影响

The effect of the Particle Morphology of Ultrafine Calcium Carbonate on Properties of PVC Composites

选用六种超细碳酸钙填充改性硬质聚氯乙烯(PVC)复合材料,研究超细碳酸钙颗粒形态对PVC复合材料性能的影响。结果表明,纳米碳酸钙和亚微米碳酸钙具有很好的增韧效果,复合材料冲击强度提高显著,轻质碳酸钙和重质碳酸钙没有增韧效果,其中,亚微米碳酸钙具有与纳米碳酸钙相当的增韧效果,且填充量明显提高;碳酸钙颗粒粒径越小、表面越规整、分散性能越好,增韧效果越好;复合材料塑化性能随碳酸钙粒子的减小而增大,加工性能则反之。

In order to toughen rigid polyvinyl chloride （PVC）, six uhrafine calcium carbonates were filled into PVC composite. Effect of particle morphology of uhrafine calcium carbonate on properties of PVC composites was studied. The results showed that： nano calcium carbonate and submicron calcium carbonate had a good toughening effect, the impact strength of the composites increased significantly; light calcium carbonate and ground calcium carbonate hardly had toughening effect. The toughening effect of submicron calcium carbonate was equal to that of nano calcium carbonate, and the loading level of submicron calcium carbonate was much higher than that of nano calcium carbonate. The toughening effect of calcium carbonate was related with particle size and morphology, the smaller particle sizes and more regular surface and better the dispersion performance, the better toughening effect. When calcium carbonate particle sizes decreased, plasticizing properties of PVC composite increased but the processing performance decreased.