【摘要】 制备了纳米CaCO3复合外墙涂料,分别探讨了分散剂种类、分散剂用量、料浆浓度、分散时间和温度等因素对纳米CaCO3分散效果的影响,优化了操作工艺条件:纳米CaCO3料浆浓度为15%(质量分数),钛酸酯偶联剂用量为纳米CaCO3质量的3%,分散时间为1.0 h.考察了纳米CaCO3浆体加入量对外墙涂料耐沾污性、触变性、耐洗刷性、耐水性、耐碱性和耐老化性的影响,并用SEM对涂层进行了表征.结果表明:与传统建筑涂料相比,纳米复合外墙涂料的上述性能显著改善;当涂料中纳米CaCO3浆体的质量分数为3%~4%时,涂料性能的改善最为明显,其耐洗刷性达75 600次.更多还原

【Abstract】 Nanometer calcium carbonate（abbreviated to nano-CaCO₃） composite exterior architectural coatings were prepared.The influences of several factors,including the variety and dosage of dispersing agents,suspension concentration,dispersing time and temperature on the dispersion of nano-CaCO₃,were investigated respectively.The technological conditions were optimized.It is concluded that the optimal technical parameters are:nano-CaCO₃ suspension concentration is 15%（by mass）;titanate coupling agent dosage is 3%（by mass） of nano-CaCO₃;dispersing time is 1.0 h.The influences of nano-CaCO₃ content were studied upon the properties such as dirt resistance,thixotropy,scrub resistance,water resistance,alkali resistance and weathering resis-（tance.） The coatings were also characterized by SEM.The results show that,in comparison with traditional architectural coatings,the above mentioned properties of nano-CaCO₃ composite coatings are remarkably improved.When nano-CaCO₃ paste content in the coatings is 3%～4%（by mass）,the improvement appears to be perfectly noticeable,for example,with the scrub resistance reaching up to（75 600） times.更多还原