蓖麻油基润滑油降凝剂的合成

Synthesis of castor oil-based lubricant pour point depressant

摘要:

以蓖麻油(CO)、甲基丙烯酸甲酯(MMA)为原料，偶氮二异丁腈(AIBN)为引发剂，甲苯作为溶剂，无水无氧条件下合成了蓖麻油-甲基丙烯酸甲酯共聚物。利用FTIR表征了蓖麻油-甲基丙烯酸甲酯共聚物的结构，用凝胶渗透色谱(GPC)测定了该聚合物的相对分子质量及其分布，并对其降凝性能进行了评价。结果表明：当m(CO):m(MMA)= 1:1、引发剂AIBN用量（引发剂用量占单体总质量的百分数）为0.25%、反应时间为8 h、反应温度为80 ℃时，收率为59.20%，聚合物相对分子质量为2.722×105，相对分子质量分布较窄（PDI=1.51）。且共聚物对润滑油具有一定降凝效果，当共聚物添加量（聚合物质量占油品质量的百分数）为0.5%时，凝点(SP)可降低10 ℃ (ΔSP=10 ℃)。

Abstract:

Castor oil-methyl methacrylate copolymer was synthesized from castor oil(CO) and methyl methacrylate(MMA) with azodiisobutyronitrile(AIBN) as initiator and toluene as solvent under anhydrous and anaerobic conditions. The structure of copolymer was characterized by FT-IR and the relative molecular mass and its distribution of the copolymer were determined by gel permeation chromatography(GPC). Performance of the synthesized pour point depression was also evaluated. The results show that the yield(59.20%)and the average molecular weight(2.722×105) of the polymer is higher with narrow relative molecular weight distribution (PDI=1.51) under the conditions of the ratio of monomer m(CO):m(MMA)= 1:1, the initiator AIBN dosage of 0.25% at 80 ℃ for 8 h. When 0.5% (w) copolymer was added to the lubricating oil, the pour point depression is most positive(ΔSP=10 ℃).