摘要
以Co/g-C_(3)N_(4)为催化剂,(NH_(4))_(2)S_(2)O_(8)为引发剂,烯丙基聚氧乙烯醚(APGE-2400、APGE-1000)、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)和乙二醇乙烯醚(EGVE)为单体,在可见光下催化自由基聚合合成了不同长短侧链比的抗泥型聚羧酸系减水剂(PCEs),利用XRD、FTIR、GPC等对其结构进行了表征,评价了其分散性能,分析了其对水泥水化行为的影响,并探究了伊利土对不同长短侧链比PCEs的吸附作用。结果表明,PCEs链段中含有酰胺基、磺酸基、羟基、醚基等功能性基团,分子量随长侧链占比的增加而增大,且分子量分布较窄;当长短侧链比为7∶3时,PCEs具有较好的分散性和抗泥性,初始及含泥初始净浆流动度分别为295 mm和280 mm;PCEs具有优异性能的原因是吸附了长侧链PCEs的伊利土层间距明显增大而片层厚度减小,且当长短侧链比为7∶3时对伊利土的影响最显著;两者间存在的强相互作用有利于PCEs的插层吸附,使伊利土片层出现不完全剥离,同时促进了水泥水化。
We synthesized anti-mud polycarboxylate superplasticizers(PCEs)with different long/short side chain ratios via polymerization under visible light by using Co/g-C_(3)N_(4) as a catalyst,(NH_(4))_(2)S_(2)O_(8) as a initiator,and allyl polyoxyethylene ether(APGE-2400,APGE-1000),2-acrylamide-2-methylpropanesulfonic acid(AMPS),and ethylene glycol vinyl ether(EGVE)as monomers.Moreover,we characterized its structure by XRD,FTIR and GPC,and evaluated its dispersion performance.Furthermore,we analyzed the effect of PCEs on the hydration behavior of cement and investigated the adsorption of illite on PCEs with different long/short side chain ratios.The results show that the chains of PCEs contain functional groups such as amide group,sulfonic group,hydroxyl group,and ether group.The molecular weight increases with the increase of the long/short side chain ratio and maintains a relative narrow molecular weight distribution.When the long/short side chain ratio is 7∶3,PCEs have superior dispersion and anti-mud performances,with the initial and mud-containing initial slurry flowability of 295 mm and 280 mm,respectively.The reason for the excellent performance of PCEs is that the interlayer spacing of illite adsorbed with long side chain PCEs significantly increases,coupled with a decrease in layer thickness,and the effect on the illite is the most significant when the long/short side chain ratio is 7∶3.The strong interaction between PCEs and illite is conducive to intercalation adsorption of PCEs,resulting in incomplete stripping of illite layer and promoting cement hydration.
作者
吴凤龙
宋瑾
WU Fenglong;SONG Jin(Department of Chemical and Environmental Engineering,Hetao College,Bayannur O1500o,China)
出处
《化学与生物工程》
北大核心
2026年第2期40-49,共10页
Chemistry & Bioengineering
基金
内蒙古自治区自然科学基金项目(2022MS05012)
内蒙古自治区高等学校青年科技英才支持计划项目(NJYT23033)
内蒙古自治区高等学校科学研究项目(NGJY22244)。
关键词
光催化
聚羧酸系减水剂(PCE)
抗泥
photocatalysis
polycarboxylate superplasticizer(PCE)
anti-mud
