疏水改性聚醚合成聚羧酸减水剂及其降粘性能研究

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (7): 2251-2257.

疏水改性聚醚合成聚羧酸减水剂及其降粘性能研究

李申桐, 杨勇, 周栋梁, 胡聪, 刘金芝, 张志勇

江苏苏博特新材料股份有限公司,高性能土木工程材料国家重点实验室,南京 211103

收稿日期:2022-03-01 修回日期:2022-04-25 出版日期:2022-07-15 发布日期:2022-08-01
作者简介:李申桐(1989—),男,工程师。主要从事新型混凝土外加剂的研究。E-mail:lishentong@cnjsjk.cn
基金资助:
国家自然科学基金青年基金(52108218)

Synthesis of Polycarboxylate Superplasticizer Based on Hydrophobic-Modified Polyoxyethylene Ether and Its Viscosity-Reducing Performance

LI Shentong, YANG Yong, ZHOU Dongliang, HU Cong, LIU Jinzhi, ZHANG Zhiyong

State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Sobute New Materials Co., Ltd., Nanjing 211103, China

Received:2022-03-01 Revised:2022-04-25 Online:2022-07-15 Published:2022-08-01

摘要/Abstract

摘要： 通过丁基缩水甘油醚在异戊烯基聚氧乙烯醚末端的碱性开环反应制备出疏水改性的聚醚大单体,并以此为原料与丙烯酸、马来酸酐共聚合成疏水改性聚羧酸减水剂,研究了丁基缩水甘油醚加成个数在3、5、8时对改性聚羧酸分散和吸附能力的影响,并通过砂浆和混凝土试验研究了改性聚羧酸对水泥浆体粘度的影响。结果表明:加成个数3是最优合成条件,此时分散能力不受影响,还能使吸附能力增强21%;继续增加加成个数,分散能力变差,且吸附能力没有显著增强。改性聚羧酸可降低砂浆粘度30%以上,提升砂浆流速40%,缩短砂浆V漏斗流出时间27%,缩短混凝土倒坍落度筒流出时间34%,这些结果都有力证实了改性聚羧酸能有效降低水泥浆体的粘度。

关键词: 丁基缩水甘油醚, 聚羧酸, 减水剂, 疏水改性, 水泥砂浆, 工作性能, 粘度

Abstract: Hydrophobic-modified polyoxyethylene ether macromonomers were prepared by alkaline ring opening reaction of butyl glycidyl ether at the ends of isoprenyl oxy poly (ethylene glycol) ether. Base on this, a series of hydrophobic-modified polycarboxylate superplasticizers were synthesized by the copolymerization of acrylic acid, maleic anhydride and hydrophobic-modified macromonomers. The effect of the adduct number (3, 5, 8) of butyl glycidyl ether on the dispersion and adsorption performance of modified polycarboxylate was studied.And the effect of modified polycarboxylate on the viscosity of cement pastes was investigated through cement mortar and concrete experiments. The results show the optimum adduct number is 3, the dispersion performance is not affected, and the adsorption performance increases by 21%. If the adduct number continues to grow, the dispersion performance gets worse while the adsorption performance is not improved markedly. The modified polycarboxylate reduces the viscosity of cement mortar by more than 30%, increases the flow velocity of cement mortar by 40%, shortens the V-funnel efflux time of cement mortar by 27% and the inverted slump tube efflux time of concrete by 34%, which unquestionably confirms that the hydrophobic-modified polycarboxylate can effectly reduce the viscosity of cement pastes.

Key words: butyl glycidyl ether, polycarboxylate, superplasticizer, hydrophobic-modification, cement mortar, working performance, viscosity

中图分类号:

TU528.042.2

李申桐, 杨勇, 周栋梁, 胡聪, 刘金芝, 张志勇. 疏水改性聚醚合成聚羧酸减水剂及其降粘性能研究[J]. 硅酸盐通报, 2022, 41(7): 2251-2257.

LI Shentong, YANG Yong, ZHOU Dongliang, HU Cong, LIU Jinzhi, ZHANG Zhiyong. Synthesis of Polycarboxylate Superplasticizer Based on Hydrophobic-Modified Polyoxyethylene Ether and Its Viscosity-Reducing Performance[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(7): 2251-2257.

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