改性纳米碳酸钙用于水性建筑涂料

Application of Modified Nano-CaCO_3 in Building Water Paint

合成改性纳米碳酸钙的表面改性剂(简称:纳米碳酸钙),主要用于建筑涂料。在纳米碳酸钙改性技术的研究中,通过正交实验方法,研究的因素是转速、改性剂用量、乳化温度、乳化时间,乳化后的热老化时间。优化改性表面的条件:转速16 000 r/min,改性剂用量3%;乳化温度75℃;乳化时间60 min;老化时间40 min。还研究了纳米碳酸钙粒度分布的测量;透过电子显微镜法,红外光谱学和热分析。结果表明改性纳米-碳酸钙的粒度分布是统一的,而且纳米碳酸钙和改性剂之间有化学吸附作用和物理吸附作用。与没有纳米-碳酸钙的传统建筑涂料相比,纳米复合镀层在抗污性、耐洗性、触变性、耐水性、耐碱性及时效性有明显改善。

A kind of modifying agent （named nano - carbonate calcium）, which was mainly used as building paint, was synthesized. With orthogonal experiment method, nano - carbonate calcium modified technique was researched from rotation rate, dosage of modifying agent, emulsification temperature and time, ageing time after emulsification. The optimal conditions are： the rotation rate is 16 000 r/min, dosage of modifying agent is 3% , emulsification temperature is 75 ℃ , emulsification time is 60 min, ageing time is 40 min. By electron microscope, infrared spectrum and thermal analysis, particles distribution of nano - carbonate calcium was also studied. The results showed that its particles distribution is constant and there are chemiadsorption and physical adsorption between nano - carbonate calcium and modifying agent. Compared with the traditional building paint, the nano composite surface was improved obviously in pollution resistance, wash fastness, thixotropy, water resistance, alkaline resistance and timeliness.