改性超细重质碳酸钙在硬质PVC中的应用

对超细重质CaCO3进行了湿法改性和复合改性，采用红外光谱图对改性后的超细重质CaCO3进行了表征，采用SEM观察了其在PVC基体中的分散情况及试样的冲击断面，测试了其对试样力学性能的影响。结果表明：对超细重质CaCO3进行表面改性后，铝酸酯接枝到了超细重质CaCO3表面，提高了超细重质CaCO3在PVC中的分散性，试样冲击断面存在着大量牵伸结构和拉丝现象，因而提高了试样的拉伸强度和冲击强度（当超细重质CaCO3用量为5份时拉伸强度最高，当超细重质CaCO.用量为15份时冲击强度最高），且复合改性比湿法改性的效果好。

The application of modified superfine ground calcium carbonate in rigid PVC

Superfine ground calcium carbonate was modified through wet modification and composite modification. The modified superfine ground calcium carbonate obtained was characterized by IR. Their dispersion in PVC and the impact cross sections of samples were observed by SEM. The influences of modified superfine ground calcium carbonate on the mechanical properties of samples were tested. The results showed that： （1）through surface modification, aluminate was grafted onto the surface of superfine ground calcium carbonate,so the dispersion property of superfine ground calcium carbonate in PVC was improved; （2）a great deal of extension structures and wire drawing phenomena existed on the impact cross sections improved the tensile strength and impact strength of samples（the highest tensile strength and the highest impact strength were obtained when the using amounts of superfine ground calcium carbonate were 5 parts and 15 parts, resp. ）; （3）the effect of composite modification was better than that of wet modification.