A kind of preparation method of retarding type ether polycarboxylate water reducer

Abstract

The invention discloses a preparation method of a retarded ether type polycarboxylate water reducer, which comprises the following steps: (1) preparation of esterification monomer; (2) copolymerization reaction; (3) neutralization reaction. The preparation method of the present invention utilizes the esterification of saccharide compounds and crotonic acid to prepare esterified monomers, which has the advantages of low cost and simple operation, and the obtained saccharide esterification products participate in the next step of copolymerization reaction, so that polycarboxylic acid is The main chain of the superplasticizer has a polyhydroxy structure, so that the prepared polycarboxylate superplasticizer has a good retarding effect, effectively prolonging the initial setting and final setting time of cement, and reducing the use of retarders. negative impact. Moreover, the polyhydroxy structure of sugar compounds makes the polycarboxylate water reducer have better slump retention performance, which is beneficial to the summer pumping construction of concrete.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to a preparation method of a retarding ether polycarboxylate water reducer. Background technique [0002] 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, which will inevitably lead to higher requirements for the performance of concrete admixtures. [0003] Although the excellent water-reducing performance of polycarboxylate superplasticizers has been widely recognized by the industry, due to factors such as changes in cement, mud content in sand, and stone materials, polycarboxylate superplasticizers have also appeared in practical applications. Problems such as excessive slump loss and poor workability. For some concrete that is transported over long distances in summer and constructed in hot weather, co...

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Problems solved by technology

[0003] Although the excellent water-reducing performance of polycarboxylate superplasticizers has been widely recognized by the industry, due to factors such as changes in cement, mud content in sand, and stone materials, polycarboxylate superplasticizers have also appeared in practical applications. Problems such as excessive slump loss and poor workability

For some concrete that is transported over long distances in summer and constructed in hot weather, compound retarders are often used to prolong the setting time. The retarder components contained in the layer superplasticizer are different, which will cause some problems of short or long setting time in the actual application process, which will affect the engineering construction. Water agent is of great significance

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