聚丙烯酸高碳醇酯降凝行为研究

Studies on the effect of polyacrylate (high carbon alcohol) on pour point of diesel

对给定正构烷烃碳链长度集中在碳数14的柴油而言,聚丙烯酸十四酯由于其烷基侧链长度与柴油中正构烷烃碳链长度匹配而表现出良好的降凝性能.聚合反应条件不同会直接影响高分子的相对分子质量分布,从而使高分子表现出不同的降凝性能.通过正交实验对制备聚丙烯酸十四脂的实验条件进行了优化,在最佳实验条件下,合成的聚丙烯酸十四酯对给定柴油的冷滤点最大降低值为6℃,凝点最大降低值为18℃.光学显微镜观察结果表明:降凝剂的降凝行为与其对蜡晶结晶的分割有关.降凝剂较少时,高分子具有分割蜡晶晶核的作用;降凝剂适量时,高分子产生晶核使蜡晶结晶细化且分散.后者晶型的结构特点对应着良好的降凝性能.

Poly(tetradecyl acrylate)(PA-14) has a good pour point depressing performance to the diesel oil whose carbon number is near to 14 because the side chain length of its alkyl matches with the carbon chain length of the normal alkane in the diesel oil.Polymerization conditions directly influence the relative molecular mass distribution of polymer and therefore influence its pour point depressing performance to the diesel oil.The polymerization conditions are optimized by orthogonal experiments,and the PA-14 prepared under the best conditions can make the solidifying point depression(SP) and cold filter plugging point(CFPP) of the diesel oil decrease 18 ℃ and 6 ℃ respectively.The optical microscope observation results of wax crystallite morphology show that the pour point depressing behavior of the pour point depressant may be related to the thinning of the wax crystal by the polymer as crystal nucleus.