EPEG型聚羧酸保坍剂的制备及性能研究

Preparation and research on the EPEG-Retention agent

以乙二醇单乙烯基聚乙二醇醚(EPEG)、丙烯酸羟丙酯(HPA)、丙烯酸(AA)为主要原料,在常温条件下通过自由基聚合合成聚羧酸保坍剂。通过试验考察了釜底浓度、反应温度、引发剂、链转移剂用量及酸醚比对产品性能的影响。最佳反应条件:HPA∶AA∶EPEG=3.5∶1.5∶1.0,引发剂占单体质量百分比为1.2%,滴加时间为60 min,保温30 min,反应结束。通过对EPEG和TPEG大单体核磁对比分析,以及EPGE与TPEG型保坍剂进行凝胶渗透色谱(GPC)、总有机碳分析仪(TOC)微观分析,证实了EPEG型保坍剂具有更优性能的微观原因。在达到相同保坍性能条件下,EPEG型保坍剂只占TPEG型保坍剂用量的80%,大幅降低了保坍剂用量,显著节约成本,大幅提高市场竞争力,同时EPEG型保坍剂常温、短时间、高效率的生产特点,使其具有良好的经济价值及广泛的应用前景。

In this paper,polycarboxylic acid retention agent was synthesized by free radical polymerization by ethylene glycol monovinyl polyglycol ether(EPEG),hydroxyl propyl acrylate(HPA)and acrylic acid(AA)at room temperature.The effects of concentration,reaction temperature,initiator,amount of chain transfer agent and ratio of acid to ester on product performance were investigated.The optimum reaction conditions were as follows:HPA∶AA∶EPEG=3.5∶1.5∶1.0,initiator accounted for 1.2%of monomer mass,dropping time was 60 min,holding temperature was 30 min,and the reaction was over.By comparing EPEG and TPEG large monomer NMR analysis,gel permeation chromatography(GPC)and total organic carbon analyzer(TOC)microscopic analysis of product,it is confirmed that EPEG has better performance than TPEG slump retention agent.The amount of EPEG synthesized product only accounts for 80%of the amount of TPEG under the same slump retention performance,which greatly reduces the amount of slump retention agent,saves significant cost,and greatly improves the company's market competitiveness.In addition,EPEG has the characteristics of normal temperature,short time and high efficiency,which makes it have good economic value and wide application prospect.