纳米碳酸钙悬浮体流变性能研究

以碳酸钙、氧化钙和邻苯二甲酸二辛酯组成的悬浮体为研究对象，模拟了碳酸钙在涂料及密封胶中流变行为，探讨了碳酸钙颗粒形貌、粒径及表面状态对其流变性能的影响。结果表明：不同形貌碳酸钙制备的悬浮体分散稳定性从强到弱依次为：立方形、纺锤形、链状。立方形碳酸钙配制成的悬浮体触变性最好，屈服应力最大；纳米碳酸钙平均粒径越大，粒径分布区间越窄，颗粒规整程度越高，其悬浮体触变性及屈服应力也越高。随着包覆量增加，触变性增强，但包覆量超过3%（质量分数）时，呈现出负触变性。

Study on rheological property of nano-sized calcium carbonate suspension

Taking the suspension being composed of nano-sized calcium carbonate，CaO，and dioctylphthalate（DOP） as theresearch objective，the rheological behaviors of calcium carbonate in coatings and sealants were simulated.The influences of the morphology，particle size，and surface property on rheological property were investigated.Results showed that the dispersion stability of suspensions prepared with different morphologies of calcium carbonate from strong to weak followed by：cubic，spindle，and chain.The thixotropic property and yield stress of suspension formed by cubic calcium carbonate were the best.When the average diameter increased，the size distribution narrowed，and the particle tacticity improved of the nano-sized calcium carbonate，the thixotropic property and yield stress of the suspension were enhanced.With the increase of the amount of coating agent，the thixotropic property gradually increased，whereas the amount of coating agent exceeded 3% （mass fraction），the thixotropic property was negative.