Enhanced polycarboxylate superplasticizer and preparation method thereof

Abstract

The invention belongs to the field of water reducing agents and particularly discloses an enhanced polycarboxylate superplasticizer and a preparation method thereof. The method includes: (1) subjecting, by weight, 50-150 parts of methacrylic acid, 50-250 parts of an alcohol amine compound, 1-5 parts of a catalyst and 0.1-3 parts of a polymerization inhibitor to esterification reaction at 110-130 DEG C for 3-5h, cooling to 35-50 DEG C, and adding alkali to obtain a reaction product containing an esterified functional monomer; (2) subjecting, by weight, 100-200 parts of methyl allyl polyoxyethylene ether, 10-20 parts of unsaturated carboxylic acid and 5-20 parts of the reaction product containing the esterified functional monomer and obtained in the step (1) to polymerization reaction in existence of, by weight, 0.5-1.5 parts of a chain initiator and 0.4-0.8 part of a chain transfer agent to obtain mother liquor of the enhanced polycarboxylate superplasticizer. The enhanced polycarboxylate superplasticizer is capable of promoting hydration reaction of cement, enabling complete hydration of large cement particles, promoting hydration product growth, improving a porous structure and aninterface structure and improving concrete structural compactness and is high in adaptability and stability.

Description

technical field [0001] The invention belongs to the field of water reducers, and in particular relates to a reinforced polycarboxylate water reducer and a preparation method thereof. Background technique [0002] As a new functional admixture proposed by domestic scholars and manufacturers in recent years, concrete reinforcing agent not only has better performance of concrete mixture, but also can save 10-15% of cement consumption. According to the records of existing data, the main function of concrete reinforcing agent is to reduce the surface energy of cement through high dispersion, improve the dispersion of cement aggregate particles, and promote the hydration of cement, thereby increasing the strength of concrete and reducing the amount of cement; The second is to use various reinforcing components to promote the tricalcium aluminate (C 3 A) and tetracalcium aluminoferrite (C 4 The hydration of AF) plays a role in stimulating the activity of cement, increasing the st...

AI Technical Summary

Problems solved by technology

At present, there is no product in the domestic market that directly synthesizes enhanced polycarboxylate superplasticizer through molecular structure design.

Concrete reinforcing agents prepared by compounding methods have relatively poor stability and adaptability due to complex components and compatibility problems, and are easy to delaminate during storage, and there will be uneven mixing during concrete production, which will affect the strengthening effect. and strength stability, therefore, judging from the current application situation in the market, it is still difficult to be effectively promoted

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