Mud-resistant polycarboxylic acid water reducer and preparation method thereof

Abstract

The invention discloses a mud-resistant polycarboxylic acid water reducer which is prepared from the following components: allyl polyoxyethylene polyoxypropylene ether, components R, R1 and R2, a chain transfer agent, an initiating agent R3 and water, wherein the component R is one or more of maleic anhydride, sodium methallyl sulfonate, vinyl acetate, itaconic acid, itaconic anhydride and fumaric acid; R1 is one or a mixture of two of acrylic acid and methylacrylic acid; R2 is one or more of ascorbic acid, sodium formaldehyde sulfoxylate, ferrous sulfate, tin sulfate, sodium hypophosphite, sodium hydrogen sulfite and oxalic acid. The invention further discloses a preparation method for the mud-resistant polycarboxylic acid water reducer. The mud-resistant polycarboxylic acid water reducer has the following benefits: the water solubility and the steric hindrance of polycarboxylic acid are effectively kept; a large amount of non-hydrophilic structures on branch chains can be used for effectively preventing soil interlayer adsorption, so that the adsorption speed and effect are greatly reduced and the mud-resistant purpose is achieved.

Description

technical field [0001] The invention relates to the technical field of concrete water-reducing agents, in particular to a polycarboxylic acid anti-mud-containing water-reducing agent and a preparation method thereof. Background technique [0002] With the rapid development of my country's economic construction, the use of concrete has increased at a rate of more than ten percent per year, and the level of concrete application technology has also continued to develop. The continuous improvement of the use of polycarboxylate water reducer instead. The use of polycarboxylate superplasticizer to configure high performance concrete has become the trend of concrete development. Polycarboxylate superplasticizers are used in high-speed railways, water conservancy and hydropower, drinking Points, highways, harbor terminals and various projects. [0003] Although polycarboxylate superplasticizer has many advantages, it is greatly affected by the fine aggregate in concrete, that is, ...

AI Technical Summary

Problems solved by technology

Scholars and industry experts at home and abroad have done a lot of work on this, and now they have come to a more consistent conclusion that the mud composition structure in fine aggregate is similar to the multi-layer structure of montmorillonite, while polycarboxylic acid has a longer branched chain , the intercalation effect of simultaneous physical and chemical reactions between these branched chains and the layer of soil occurs, thus losing the steric hindrance ability and leading to deactivation

[0005] According to these mechanisms, some experts have carried out some experiments to polymerize carboxylic acid with short-chain branches without hydrophilic ethylene oxide, and investigate the adsorption capacity and intercalation effect of montmorillonite, although it is proved from the data of adsorption curve The correctness of this theory is confirmed, but polycarboxylic acid mainly relies on the steric effect of long-chain branches to disperse cement particles. , the water solubility of polycarboxylate and the adaptability to cement have big problems

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