Shrinkage-reducing polycarboxylate superplasticizer and preparation method thereof

Abstract

The invention relates to the technical field of building additives, in particular to a shrinkage-reducing polycarboxylate superplasticizer and a preparation method thereof. The shrinkage-reducing polycarboxylate superplasticizer comprises an esterification product, unsaturated polyoxyethylene ether, an emulsifier, an initiator solution, a chain transfer agent solution, an ester macromonomer, acrylic acid, a shrinkage-reducing functional monomer and an unsaturated sulfonate mixed solution. The preparation method comprises the following steps: preparing an esterification product; performing copolymerization reaction; and performing neutralization reaction. The esterification product is prepared by esterification of coconut diethanolamide and unsaturated acid and has the advantages of low cost and simplicity and convenience in operation, and the prepared esterification product and the shrinkage-reducing functional monomer are subjected to copolymerization reaction, so that a main chain of the polycarboxylate superplasticizer has hydrophilic groups such as amide and shrinkage-reducing groups; and the prepared polycarboxylate superplasticizer has low surface tension, effectively reduces the drying shrinkage of concrete, effectively improves the internal mechanical properties and strength of concrete, and has significant application value.

Description

technical field [0001] The invention relates to the technical field of building admixtures, in particular to a shrinkage-reducing polycarboxylate water reducer and a preparation method thereof. Background technique [0002] As a new type of water reducer, polycarboxylate water reducer has the advantages of low dosage, high water reducing rate, good slump retention, small shrinkage, relatively good adaptability to cement and admixtures, and obvious reinforcement effect. The outstanding performance of the series has been widely used in various engineering fields. With the construction of national large-scale infrastructure nuclear power, water conservancy, bridges and various large-scale projects, the performance requirements of concrete are constantly improving. It also has the effect of reducing the drying shrinkage of hardened concrete. This multifunctional polycarboxylate water reducer has become a hot research topic at home and abroad. [0003] The first kind of shrinka...

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Problems solved by technology

[0005] In order to solve the problem of the existing shrinkage-reducing water-reducer mentioned in the above-mentioned background technology that not only the water-reducing rate is low but also the shrinkage-reducing effect is poor, the present invention provides a shrinkage-reducing polycarboxylate water-reducer, which also includes the following components: esterification product , unsaturated polyoxyethylene ether, emulsifier, initiator solution, chain transfer agent solution, ester macromonomer, acrylic acid, shrinkage functional monomer and unsaturated sulfonate mixed solution;

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