A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The invention relates to the technical field of water reducing agents, in particular to a method for preparing a polycarboxylate high-efficiency water reducing agent, which comprises the following specific steps: (a) esterifying methoxy polyethylene glycol (MPEG) and acrylic acid (AA) under the action of p-toluenesulfonic acid (catalyst) and p-benzoquinone (polymerization inhibitor) according to an acid-alcohol ratio of 4: 1 by adopting a solvent-free method to prepare methoxy polyethylene glycol acrylic monoester (PA1400); (b) taking acrylic acid (AA), sodium methallyl sulfonate (MAS) and self-made methoxy acrylic acid polyethylene glycol monoester (PA1400) as reaction monomers; the synthesis route starts from molecular design, acrylic acid, methoxy polyethylene glycol acrylic monoester and sodium methallyl sulfonate are used as polymeric monomers, the polycarboxylate superplasticizer with a comb-shaped molecular structure is synthesized in an aqueous solution through a polymerizable monomer direct copolymerization method, the polymerization process of the superplasticizer is solvent-free and formaldehyde-free, and the polycarboxylate superplasticizer has the advantages of high water-reducing efficiency and high water-reducing efficiency. The alkali content and the chloride ion content are low, so that the product is green and environment-friendly.
本发明涉及减水剂技术领域，具体涉及一种制备聚羧酸盐高效减水剂的方法，其具体步骤如下：(a).采用无溶剂法，以甲氧基聚乙二醇(MPEG)和丙烯酸(AA)在对甲苯磺酸(催化剂)和对苯醌(阻聚剂)作用下、酸醇比＝4:1，酯化制备甲氧基聚乙二醇丙烯酸单酯(PA1400)；(b).以丙烯酸(AA)、甲基丙烯磺酸钠(MAS)、自制的甲氧基丙烯酸聚乙二醇单酯(PA1400)为反应单体；该合成路线从分子设计入手，以丙烯酸、甲氧基聚乙二醇丙烯酸单酯、甲基丙烯磺酸钠为聚合单体，在水溶液中通过可聚合单体直接共聚法合成了一种具有梳形分子结构的聚羧酸盐高效减水剂，该减水剂聚合过程无溶剂，不含甲醛，碱含量和氯离子含量低，是一种绿色环保型的产品。
The invention relates to the technical field of water reducing agents, in particular to a method for preparing a polycarboxylate high-efficiency water reducing agent, which comprises the following specific steps: (a) esterifying methoxy polyethylene glycol (MPEG) and acrylic acid (AA) under the action of p-toluenesulfonic acid (catalyst) and p-benzoquinone (polymerization inhibitor) according to an acid-alcohol ratio of 4: 1 by adopting a solvent-free method to prepare methoxy polyethylene glycol acrylic monoester (PA1400); (b) taking acrylic acid (AA), sodium methallyl sulfonate (MAS) and self-made methoxy acrylic acid polyethylene glycol monoester (PA1400) as reaction monomers; the synthesis route starts from molecular design, acrylic acid, methoxy polyethylene glycol acrylic monoester and sodium methallyl sulfonate are used as polymeric monomers, the polycarboxylate superplasticizer with a comb-shaped molecular structure is synthesized in an aqueous solution through a polymerizable monomer direct copolymerization method, the polymerization process of the superplasticizer is solvent-free and formaldehyde-free, and the polycarboxylate superplasticizer has the advantages of high water-reducing efficiency and high water-reducing efficiency. The alkali content and the chloride ion content are low, so that the product is green and environment-friendly.
本发明涉及减水剂技术领域，具体涉及一种制备聚羧酸盐高效减水剂的方法，其具体步骤如下：(a).采用无溶剂法，以甲氧基聚乙二醇(MPEG)和丙烯酸(AA)在对甲苯磺酸(催化剂)和对苯醌(阻聚剂)作用下、酸醇比＝4:1，酯化制备甲氧基聚乙二醇丙烯酸单酯(PA1400)；(b).以丙烯酸(AA)、甲基丙烯磺酸钠(MAS)、自制的甲氧基丙烯酸聚乙二醇单酯(PA1400)为反应单体；该合成路线从分子设计入手，以丙烯酸、甲氧基聚乙二醇丙烯酸单酯、甲基丙烯磺酸钠为聚合单体，在水溶液中通过可聚合单体直接共聚法合成了一种具有梳形分子结构的聚羧酸盐高效减水剂，该减水剂聚合过程无溶剂，不含甲醛，碱含量和氯离子含量低，是一种绿色环保型的产品。
Method for preparing polycarboxylate superplasticizer
一种制备聚羧酸盐高效减水剂的方法
WEN XIA (author)
2022-10-25
Patent
Electronic Resource
Chinese
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