| 摘要: |
| 将苯丙氨酸接枝到马来酸酐聚乙二醇酯末端，合成了氨基酸改性不饱和酸酯，并将其引入到聚羧酸减水剂（PCE）中，制备了耐泥PCE；研究了氨基酸改性不饱和酸酯、引发剂和链转移剂用量对水泥-蒙脱土净浆耐泥性能的影响，并结合蒙脱土吸附量、层间距和孔结构的变化，对耐泥PCE的作用机理进行了研究.结果表明：与普通PCE相比，采用耐泥PCE制备的水泥-蒙脱土净浆初始流动度增大18.6%，经时损失率从39.5%降低至13.7%；氨基酸改性不饱和酸酯有效降低了蒙脱土对PCE的吸附量，抑制了蒙脱土的插层吸附和表面吸附. |
| 关键词: 苯丙氨酸 耐泥 聚羧酸减水剂 蒙脱土 作用机理 |
| DOI：10.3969/j.issn.1007-9629.2021.06.010 |
| 分类号:O632 |
| 基金项目: |
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| Preparation and Mechanism of Amino Acid Modified Clay Resistant Polycarboxylate Superplasticizers |
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GAO Yuxin, YANG Wen, LIU Ming, ZENG Chao, WANG Futao
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China West Construction Academy of Building Materials Co.， Ltd.， Chengdu 610052， China
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| Abstract: |
| Phenylalanine was grafted onto the end of maleic anhydride polyethylene glycol ester to synthesize amino acid modified unsaturated acid ester， which was introduced into polycarboxylate superplasticizers （PCE） to prepare clay resistant PCE. The effects of the amount of amino acid modified unsaturated acid esters， initiator and chain transfer agent on clay resistance of cement-montmorillonite slurry were discussed. Combined with the changes of the adsorption capacity， layer spacing and pore structure of montmorillonite， the effect mechanism of clay resistant PCE was studied. The results show that compared with ordinary PCE， the initial fluidity of cement-montmorillonite slurry prepared by clay resistant PCE increases by 18.6% and the spread flows loss rate decreased from 39.5% to 13.7%. Amino acid modified unsaturated acid ester reduces the adsorption of PCE on montmorillonite and inhibits the intercalation adsorption and surface adsorption of montmorillonite. |
| Key words: phenylalanine clay resistant polycarboxylate superplasticizer montmorillonite mechanism |
