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 CaCOj particles modified with the co-modifier appeared hydrophobic and lipophilic. The rheological behavior of the suspensions composed of the unmodified and modified CaCQ 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 CaCO3 powder modified with the co-modifier could had a higher whiteness and better mechanical properties.%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.
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