Modified polycarboxylate superplasticizer and preparation method thereof

Abstract

The invention provides a modified polycarboxylate superplasticizer and a preparation method thereof, and the preparation method comprises the following steps: reacting 2-naphthol-3, 6-disulfonic acid with polyether to obtain modified polyether; the preparation method comprises the following steps: adding modified polyether into water, uniformly dissolving, adding an oxidizing agent, uniformly stirring, adding sodium hypophosphite, uniformly mixing to obtain a solution A, uniformly mixing unsaturated carboxylic acid and a reducing agent, adding water, uniformly mixing to obtain a solution B, dropwise adding the solution B into the solution A, and preserving heat after dropwise adding. The modified polycarboxylic acid water reducing agent provided by the invention has relatively strong adjustability, a TC type polycarboxylic acid water reducing agent is synthesized by modifying the basic comb-shaped structure of the polycarboxylic acid water reducing agent, and the modified polycarboxylic acid water reducing agent has lasting water locking property and mud resistance, does not reduce the dispersing performance, and effectively makes up the defect that the traditional polycarboxylic acid water reducing agent is sensitive to mud.

Description

technical field [0001] The invention belongs to the field of water reducers, in particular to a modified polycarboxylate water reducer and a preparation method thereof. Background technique [0002] As a concrete admixture with excellent performance, polycarboxylate superplasticizer has been widely used in our country. It has the advantages of high water reducing rate, good slump retention, low shrinkage, and environmental protection. Therefore, it has widely replaced high-efficiency water reducers represented by naphthalene series in various concrete projects. However, it still has many shortcomings, such as only having strong dispersion and not having water-locking properties, which makes concrete prone to segregation and bleeding; it is more sensitive to mud in the aggregate, and clay will weaken the cement dispersion of polycarboxylate superplasticizers It can reduce the fluidity of mortar and accelerate the slump loss of concrete. Contents of the invention [0003] ...

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Problems solved by technology

However, it still has many shortcomings, such as only having strong dispersion and not having water-locking properties, which makes concrete prone to segregation and bleeding; it is mo...

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