松香酸封端的二聚脂肪酸/聚乙二醇聚酯的合成及性能表征

以妥尔油脂肪酸二聚酸为原料,先与聚乙二醇(PEG 400)缩聚后得到聚酯,然后再用松香对聚酯封端,制备了松香基聚酯醚型非离子高分子表面活性剂,并对其性能进行了研究。聚酯适宜的制备工艺条件:减压条件下,反应物二聚酸与聚乙二醇的摩尔比为1∶1.20,催化剂SnC l2用量为二聚酸质量的0.30%,反应温度200℃,反应时间6 h,酯化率达到98.11%。产物的数均相对分子质量(Mn)6 135,重均相对分子质量(Mw)7 438,相对分子质量分布系数(Mw/Mn)为1.212且呈好的窄分布状态。正交试验优化后的松香封端反应的条件为:再补加聚酯质量0.20%的催化剂SnC l2,聚酯与松香物质的量之比为1∶1.30,反应温度215℃,反应时间2.8 h,封端率达62.75%。红外光谱验证了目标产物的存在。性能研究表明,产物具有很好的钙皂分散力、消泡和抑泡力、乳化性和乳化稳定性。

Preparation and Properties of Dimeric Fatty Acid/Polyethylene Glycol Polyester Terminated with Rosin Acid

A new kind of non-ionic polymeric surfactant, the dimeric fatty acid (DFA)/polyethylene glycol (PEG) polyester terminated with rosin acid, was prepared with rosin acid and a polyester which was synthesized from DFA and PEG 400, and its surface activities were studied. The optimum reaction conditions of esterification were as follows: molar ratio of DFA /PEG 400 1:1.20, stannous chloride as the preferable catalyst at amount 0.30 % of DFA, reaction temperature 200 ℃, reaction time 6 h, the conversion can reach 98.11 %. Number-average molecular weight (Mn) of the product is 6 135. Weight-average molecular weight (Mw) of the product is 7 438. The coefficient of distribution of molecular weight (Mw/Mn) is 1.212, which indicates a narrow distribution of molecular weight. Orthogonal experiment results of rosin acid terminated reaction of dimeric fatty acid polyethylene glycol polyester showed that optimum reaction conditions were as follows: molar ratio of materials n(DFA/PEG polyester):n(rosin acid) 1:1.30, dosage of catalyst SnCl2 0.20 % of polyester, reaction temperature 215 ℃. After 2.8 h, termination ratio of the end hydroxyl groups of polyester reached 62.75 %. Rosin acid terminated DFA/PEG polyester surfactant has excellent emulsification properties, emulsification stability, power to disperse calcium soap as well as performances of defoaming and inhibiting foaming.