苯乙烯与马来酸酐在引发剂(BPO)的作用下反应得到苯乙烯-马来酸酐共聚物(SMA),再与混合高碳胺酰胺化得到目标产物.通过正交实验对产率影响的研究,获得聚合反应的较优工艺条件:n(马来酸酐)∶n(苯乙烯)=1∶1,聚合反应温度80℃,溶剂用量(质量分数)90％,引发剂用量(以原料总量计)1.0％；通过酰胺化反应中各因素对降凝效果的影响,得到制备目标产物的较优条件:SMA与混合高碳胺摩尔比为1∶2,催化剂用量为1.5％,酰胺化时间为5h.当加剂量为0.3％时,试验原油可降低7℃.%Styrene-maleic anhydride copolymer (SMA) was prepared from styrene, maleic anhydride and an initiator (BPO) . Then, the prepared SMA was grafted with mixed higher aliphatic amile to obtain the target product by amidation. The influencing factors on the copolymer yield were studied by orthogonally arranged experiment and the optimal conditions were found as follows; molar ratio of maleic anhydride to styrene of 1:1, polymerization temperature 80 ℃ , amount of solvent 90% (based on the mass fraction) , amount of intiator 1.0% (based on total mass of raw material). The effects of various factors on the pour point depressant showed that the optimum conditions for preparation of the target product: molar ratio of SMA and mixed high-carbon amine was 1:2, amount of catalyst was 1. 5% , and the amidation time was 5 h. When the dosage of the pour point depressant was 0. 3% , the freezing point of the test crude oil could be reduced by 7 ℃.
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