马来酸酐-醋酸乙烯酯-高碳胺三元共聚物柴油降凝剂的降滤机理

利用红外光谱法(IR)、差示扫描量热法(DSC)和动态光散射法(DLS)初步探讨了马来酸酐-醋酸乙烯酯-高碳胺三元共聚物降凝剂(MV-a)对柴油的降滤机理。柴油中加入MV-a降凝剂后，其红外光谱特征吸收峰面积比A1363/A1377、A722/A733增大，表明蜡晶结构发生了明显的变化，MV-a分子与柴油蜡晶分子发生共晶作用是MV-a降凝剂降滤的主要机理；加MV-a降凝剂前后柴油DSC曲线的峰面积和斜率减小明显；MV-a降凝剂分散在柴油中的粒径小于1000 nm，易形成胶体分散体系，降滤效果较明显。

MECHANISM OF MALEIC ANHYDRIDE-VINYL ACETATE-HIGHER AMINE TERPOLYMER AS POUR POINT DEPRESSANT FOR DIESEL FUEL

The mechanism of maleic anhydride-vinyl acetate-higher amine terpolymer (MV-a) as the pour point depressant for diesel oil was explored preliminarily by using infrared spectrometry(IR)，differential scanning calorimeter(DSC) and dynamic light scattering(DLS) methods. The IR adsorption peak area ratios of A1363/A1377 and A722/A733 were increased remarkably for the wax sample separated from diesel oil with MV-a added, compared with that of wax sample without MV-a, showing that the structure of wax crystal was varied obviously. The co-crystallization of wax crystal and MV-a molecules might be the mechanism of cold filter plugging point reduction for diesel oil. If the peak areas and slopes of DSC curves reduced obviously for the diesel oil with MV-a added compared with that without MV-a, it will be better for the cold filter plugging point reduction of diesel oil. The colloidal dispersion was formed when the grain diameter of MV-a in diesel oil was less than 1000 nm, and the cold filter plugging point depression was better, too.