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以甲基烯丙基聚氧乙烯醚和丙烯酸为单体,通过自由基聚合制备聚羧酸系减水剂。首先调整丙烯酸(AA)和衣康酸(IA)的掺加量,研究上述条件对合成减水剂抗黏土能力的大小。随后对不同抗泥小料的抗黏土性能进行对比。研究发现:随着AA用量增加,合成的聚羧酸系减水剂抗黏土能力逐渐增加;随着IA用量增加,合成的聚羧酸系减水剂抗黏土能力呈单峰趋势,当n(IA)∶n(HPEG)=0.6时,减水剂抗黏土能力优异;随着抗泥小料用量的增加,水泥净浆流动度呈逐渐增加的变化趋势。其中KN-4抗黏土性能优异,且有辅助减水的功效。不同抗泥小料抗黏土能力从大到小依次为:KN-4>KN-1>KN-2>KN-3。
Poly (methacrylic acid) superplasticizer was prepared by free radical polymerization using methyl allyl polyoxyethylene ether and acrylic acid as monomers. First adjust the amount of acrylic acid (AA) and itaconic acid (IA), to study the above conditions for synthetic water-reducing agent anti-clay capacity. Subsequent anti-clay material of different anti-clay performance comparison. The results showed that the anti-clay ability of the synthesized polycarboxylate water-reducing agent increased with the increase of the amount of AA. With the increase of the amount of IA, the anti-clay ability of the synthesized polycarboxylate water- IA): HP (HPEG) = 0.6, the superplasticizer possesses excellent anti-clay ability. With the increase of anti-mud material consumption, the fluidity of cement paste shows an increasing trend. Among them, KN-4 has excellent anti-clay performance and has the effect of assisting water-reducing. Different anti-clay material anti-clay ability descending order: KN-4> KN-1> KN-2> KN-3.