摘要：采用油酸-马来酸酐混合改性剂干法改性可用于塑料填料的超细CaCO₃粉体,借助拉曼光谱、差热分析、比表面积、粒度分布和流变性等分析手段,对不同改性情况下的CaCO₃颗粒表面进行表征。利用万能材料实验机和色差计对填充了改性前后CaCO₃粉体的聚乙烯塑料进行力学性能和物理性能测试分析。结果表明:油酸-马来酸酐混合改性剂通过干法改性可以物理吸附在CaCO₃颗粒的表面,使得CaCO₃粉体的比表面积增大,颗粒表面能、界面张力大大降低并表现出较好的亲油疏水性,制成的石蜡-CaCO₃悬浮液的表观黏度大大下降;还可以使聚乙烯塑料具有较好的力学性能,同时聚乙烯塑料具有较高的白度。

关键词： 超细粉体;填料;表面改性;混合改性剂

Abstract：The ultrafine powders of calcium carbonate （CaCO₃） was modified with a co-modifier of oleic acid and maleic anhydride in a high intensive stirrer. The surface structures of prepared samples were characterized by various methods like Raman spectroscopy， thermogravimetric analysis， specific surface area， particles size distribution and rheology. The results indicated that there existed a physical adsorption of modifiers on the surface of CaCO₃ particles. The surface free energies and polar components of the particles modified with the co-modifier were lower than those of the unmodified CaCO₃ particles. The CaCO₃ particles modified with the co-modifier appeared hydrophobic and lipophilic. The rheological behavior of the suspensions composed of the unmodified and modified CaCO₃ with paraffin was compared. The results showed that the apparent viscosity of the suspension with the modified CaCO₃ powders was lower than that of the suspension with unmodified CaCO₃ powders. A polyethylene plastic filled by CaCO₃powder modified with the co-modifier could had a higher whiteness and better mechanical properties. 

Keywords： ultrafine powders； filler； surface modification； co-modifier