明确高岭土对抗泥型聚羧酸系减水剂（PCE）的吸附作用，能有效指导催化合成抗泥型PCE过程中的分子结构设计。研究以Co/CeO₂为催化剂，（NH₄）₂S₂O₈为引发剂，烯丙基聚氧乙烯醚（APEG-1000）、2-丙烯酰胺基-2-甲基丙磺酸（AMPS）和乙烯基磺酸钠（VS）为单体，可见光催化合成系列低分子质量APEG抗泥型PCEs，其分子链段中含有胺基、磺酸基、聚氧乙烯链等功能性基团，数均分子质量为1 400左右，重均分子质量为3 800左右，具有较窄的分子质量分布。最佳制备条件为：APEG-1000、AMPS和VS的物质的量比为1∶0.1∶0.1，（NH₄）₂S₂O₈、Co/CeO₂用量分别为单体总质量的9%和0.2%，反应温度为60 ℃，反应时间为4 h，制备的PCE具有较好的分散性和抗泥性，水泥初始净浆流动度为272 mm，掺高岭土后流动度为260 mm且60 min内无损失。表征发现，该PCE与高岭土存在强相互作用。一方面有利于PCE的锚定吸附；另一方面使高岭土的主要衍射峰（001）面层间距增大0.002 9 nm、片层厚度减少4.64 nm。这种吸附作用对提高减水剂的抗泥性和保持性是有益的。

The adsorption mechanism of water reducer to clay is of great significance in effectively guiding the design of molecular structure of mud⁃inhibiting polycarboxylate superplasticizer（PCE）.Here，we prepared a series of low molecular weight anti⁃mud PCEs by visible light heterogeneous photocatalysis using Co/CeO₂ as catalyst，（NH₄）₂S₂O₈ as initiator，allyl polyoxyethylene ether（APEG-1000），2-acrylamido-2-methylpropanesulfonic acid（AMPS） and sodium vinyl sulfonate（VS） as monomers.The molecular chain contained functional groups such as carboxyl，amine，sulfonic acid，and polyethylene oxide chains，with a number⁃average molecular weight of approximately 1 400 and a weight⁃average molecular weight of approximately 3 800，and a relatively narrow molecular weight distribution.The most suitable synthesis process condition was obtained as follows.The ratio of APEG-1000、AMPS and VS was 1∶0.1∶0.1.The amount of（NH₄）₂S₂O₈ and Co/CeO₂ was 9% and 0.2%，respectively.The reaction temperature was 60 ℃.The reaction time was 4 h.The initial flow of the cement paste was 272 mm，while the flow was 260 mm after adding kaolin without loss in 60 minutes，demonstrating superior dispersion and antimud properties.The systematic characterizations revealed that the excellent antimud performance could be attributed to several factors.On the one hand，the strong interactions were conducived to anchoring adsorption of the PCE by cement and kaolin particles.On the other hand，the main diffraction peak（001） of kaolin was increased by 0.002 9 nm and the layer thickness was reduced by 4.64 nm when PCE was inserted into the interlayers of kaolin.Overall，this adsorption was beneficial to improve the mud resistance and retention of polycarboxylate superplasticizers.