聚醚酯类消泡剂的制备及性能研究

Synthesis and Properties Research of Copolyether Esters as Defoamers

以脂肪醇、环氧乙烷(EO)、环氧丙烷(PO)为原料,KOH为催化剂,合成相对分子质量1500、3000,链段排列方式为PO-EO和PO-EO-PO的聚醚,分别记为1号和2号;再以月桂酸或硬脂酸为酯化剂,对甲苯磺酸作催化剂,对聚醚进行酯化,得到12种聚醚酯类消泡剂。考察了反应时间、聚醚与酯化剂摩尔比和催化剂加量对消泡剂酯化率的影响。最佳合成条件为反应温度140～160℃,聚醚、酯化剂摩尔比1.2:1,酯化时间7 h。用所得消泡剂处理渤海旅大5-2井口综合管汇油样,结果表明,以硬脂酸、自制2号聚醚为原料得到的聚醚酯类消泡剂具有最佳的消泡性能,消泡率为87.8%,优于一般有机硅类消泡剂(66.7%),稍弱于氟烃基硅油消泡剂(91.1%),应用开发前景良好。

No.1 and No.2 polyether with molecular mass of 1500 and 3000, chain arrangement PO-EO and PO-EO-PO, were synthesized with KOH as catalyst, fatty alcohol, ethylene oxide （EO） and propylene oxide （PO） as raw materials. Then, 12 kinds of polyether esters defoaming agent were prepared with laurie acid or stearic acid as esterification agent, p-toluene sulfonic acid as catalyst. The effect of reaction time, the molar ratio of polyether and esterification agent and catalyst dosage on the esterification rate of defoaming agent was investigated. The optimum reaction condition was obtained as follows： 140---160~C reaction temperature, 1.2：1 polyether and esterification agent molar ratio, 7 h esterification time. The defoaming agent was used to handle the manifold sample of Liida 5-2 comprehensive wellhead in Bohai Sea. Experiment results showed that the defoaming rate of polyether ester defoaming agent was 87.8% with p-toluene sulfonic acid and No.2 polyether as raw materials, which was superior to that of general organic silicon defoaming agent （66.7%） and slightly weaker than that of fluorine alkyl silicone defoamer （91.1%）. The application development prospect was good.