制备有机膨润土的影响因素分析及其在乳胶漆中的应用研究

Analysis on Factors Influencing Preparation of Organobentonite and Its Application in Coatings

以新疆乌兰林格提纯膨润土为原料,经Na NO3钠化改性、十六烷基三甲基氯化铵和十八烷基三甲基氯化铵2种季铵盐有机改性得到有机膨润土,考察了反应条件对有机膨润土性能的影响;用该有机土改性市售乳胶漆,考察了有机膨润土对乳胶漆性能的影响。实验表明:较优的有机化反应条件为浆液p H为9、反应温度为60℃、反应时间为1.5 h,由此得到的有机膨润土的性能远优于行标;当十八烷基三甲基氯化铵有机膨润土的用量为4%时,乳胶漆的黏度、耐溶剂性、耐磨性、耐冲击性分别提高了144%、80%、74%、120%,指标符合国家标准。

A purified bentonite from Wulanlinge mine in Xinjiang was modified with NaNO3 and further modified with hexadecyltrimethylammonium chloride and octadecyl trimethyl ammonium chloride to forman organobentonite. The influence of reaction condition on properties of the prepared organobentonite was investigated. The reaction condition was optimized as follows： the pH value was 9; the reaction temperature was 60℃, and the reaction time was 1.5 h. Thus, the prepared organobentonite exhibited properties higher than the level of national standards. Moreover, the influence of organobentonite content on properties of the modified emulsion paint was examined. The results showed that the viscosity, solvent resistance, wear resistance and impact resistant of emulsion paint were improved by 144%, 80%, 74%, 120% respectively when the content of octadecyl trimethyl ammonium chloride organobentonite was 4wt%, and the main properties of the prepared emulsion paint met the national standards.