Low-slump water reducing agent and preparation method thereof

Abstract

The invention provides a low-slump water reducing agent and a preparation method thereof. The water reducing agent is mainly prepared from 24.5 to 28.1 parts of alcohol ether, 300.8 to 308.9 parts of a cyclic monomer, 0.5 to 1.6 parts of a catalyst, 55.4 to 56.9 parts of an acid substance, 2.5 to 5.8 parts of a reducing agent, 3.5 to 5.7 parts of an initiator, 4.8 to 8.3 parts of a neutralizing agent, 1.2 to 3.3 parts of a chain transfer agent and the balance of deionized water. The preparation method comprises the following steps: firstly preparing a polyether monomer, designing the acid-ether ratio of the water reducer according to the molecular weight of the prepared polyether, and introducing a polar functional group with strong adsorbability into polycarboxylic acid molecules through a free radical polymerization method by utilizing the advantage of strong designability of the molecular structure of the polycarboxylic acid, thereby ensuring the excellent adsorption and dispersion performance of the water reducer; and synthesizing the excellent low-slump water reducing agent.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a preparation technology of a water reducer, in particular to a low slump type water reducer and a preparation method thereof. Background technique [0002] With the continuous development of China's economy, my country's concrete technology has also been greatly improved. Through the continuous efforts of scientific researchers, a variety of new concrete materials have been launched. As an indispensable part of concrete, water reducing agent is also developed in a leap. In the past, concrete water reducing agent was rarely used in the construction of highways, but now the national concrete durability control is becoming more and more strict, which has prompted The strength of concrete admixture promotion. [0003] Patent CN202010635498.4 discloses a preparation method of a water-reducing agent for cement with slump-preserving performance. After grinding the water-soluble water-reducing a...

AI Technical Summary

Problems solved by technology

In the water reducer formula of the present invention, a certain amount of additives are added, which can improve the dispersibility, promote the organic reaction, and speed up the efficiency of the reaction, especially 1-ethyl-(3-dimethylaminopropyl) Whether carbodiimide hydrochloride and dimethylacetamide are used in combination has a great impact on the efficiency of the reaction and the effect of water reduction, and it is found in practice that the combined use of these two additives is particularly sensitive. More or less, can not achieve the desired effect

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