Air-entraining type polycarboxylic acid water-reducing agent and synthetic process thereof

Abstract

The invention discloses an air-entraining type polycarboxylic acid water-reducing agent and a synthetic process of the water reducing agent. The synthetic process comprises the following steps: sequentially adding fatty alcohol polyoxyethylene ether, a polymerization inhibitor and methacrylic acid into a reaction vessel, performing full stirring, adding a catalyst into the reaction vessel, and performing a reaction under heating condition to form intermediate methacrylic acid fatty alcohol polyoxyethylene ether ester; and under normal temperature and normal pressure, using water as a solvent,performing a polymerization reaction on methallyl polyoxyethylene ether, methacrylic acid, 2-acrylamido-2-methyl propanesulfonic acid (abbreviation: AMPS), a composite initiator and an ester intermediate, and after the reaction is completed, replenishing water into the reaction vessel to adjust a solid content, so as to obtain the water reducing agent. The water reducing agent provided by the invention has the simple synthetic process, the reaction conditions are easy to control, and the water reducing agent can be synthesized at a normal temperature and has low energy consumption and no pollution.

Description

technical field [0001] The invention relates to the technical field of polycarboxylate concrete water reducer, and more specifically relates to an air-entraining type polycarboxylate water reducer and its synthesis process. Background technique [0002] In concrete engineering, the use of concrete admixtures to improve concrete performance has attracted more and more attention. Especially in water conservancy projects and road engineering, there are higher requirements for concrete durability. Using high-performance concrete admixtures to improve concrete durability Improving the durability of concrete is mainly reflected in improving the frost resistance, impermeability and chloride ion penetration resistance of concrete. [0003] In the concrete superplasticizer products, it is divided into ordinary concrete superplasticizers, high-efficiency concrete superplasticizers, air-entrained concrete superplasticizers, etc. At present, the concrete water reducer in my country is ...

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Problems solved by technology

[0004] In recent years, there have been many related researches at home and abroad, but most of them have complex synthesis processes, high requirements for production equipment, high reaction temperature, high energy consumption, more toxic substances in the reactants, and high pollution, so they are not suitable for industrial production. large-scale promotion

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