苯甲酸膨润土的合成及其表征

SYNTHESIS AND CHARACTERIZATION OF BENZOIC ACID-BENTONITE

为了改性具有芳烃基团的有机高分子材料,用苯甲酸改性碱性钙基膨润土制备了苯甲酸有机膨润土。改性反应是在有机溶剂中,通过回流分水使反应充分进行。采用单因素分析方法,考察苯甲酸用量、分散剂用量、反应时间等因素对苯甲酸有机膨润土有机物含量的影响。用差热-热重分析、X射线衍射、红外光谱等手段对样品进行表征。结果表明:苯甲酸有机膨润土的有机物质量分数超过40%;苯甲酸根插入膨润土层间后,使膨润土的层间距扩大,晶体结构更加完整。苯甲酸有机膨润土是一种插层苯环结构的有机膨润土,它的层间距比较大,有机化程度高,与芳香烃等高分子材料的相容性较好,热稳定性高,有着较好的开发前景。

In order to modify aromatic polymer, benzoic acid-bentonite was synthesized by treating alkaline Ca-bentonite with benzoic acid. The modified reaction was completely finished by circumfluence to repel water in organic solvent. In the experiment, single-factor analysis was adopted and the influence of the amount of benzoic acid and solvent and the reaction time on the organic con- tent in bentonite was studied. The properties of the product were characterized by thermogravimetry-differential thermal analysis, X-ray diffraction and Fourier infrared transmission spectroscopy. The results show that the organic content of the product is exceeded 40% in mass. The benzoic acid anions are intercalated in the layer of bentonite, the layer spacing is expanded and the crystal structure is more complete. Benzoic acid bentonite has many applications due to its large layer spacing, high organization, compatibility with aromatic polymer and thermal stabilization.