Polycarboxylic acid high performance water reducer and its preparation method

Abstract

The invention relates to a polycarboxylic acid high performance water reducer and its preparation method. According to the preparation method provided by the invention, a copolymerization reaction is performed among 30.3-35.4 wt% of a monomer A, 2.83-5.02 wt% of a monomer B, 0.47-1.32 wt% of a monomer C and 0.86-1.87 wt% of a monomer D in a hydrosolvent system in the presence of an initiator and a chain transferring agent; and then pH of the reaction product is adjusted by a solution so as to obtain the polycarboxylic acid high performance water reducer, wherein the monomer A is methyl alkenyl polyethenoxy ether; the monomer B is methacrylic acid; the monomer C is methyl methacrylate and the monomer D is sodium methallyl sulfonate. According to the invention, concrete can still maintain good performance even if clay content exceeds standard and there is low content of sandstone with nonuniform particle fineness, sensitivity is greatly decreased, and retarding performance is not obvious when the content is high; the water reducer can be used to guarantee good fluidity and excellent pumping performance of concrete and greatly improve its construction performance; the effect of raising early strength is very obvious; and the water reducer has strong practicality, is widely applied, and can be used to remarkably accelerate construction progress and save capital cost in comparison with common products.

Description

technical field [0001] The invention belongs to the field of preparation of concrete water reducers, in particular to a polycarboxylic acid high-performance water reducer and a preparation method thereof. Background technique [0002] Concrete is a basic building material. With the improvement of my country's construction standards, high-strength and high-durability concrete has become more and more popular and important. As one of the concrete components, concrete admixtures, especially concrete superplasticizers, have been widely used. The current water reducers mainly include: naphthalene-based, melamine-based, and sulfamate-based, etc. The disadvantages mainly include: the concrete prepared by them has high viscosity, difficult pumping, and unfavorable for construction. Polycarboxylate superplasticizer has been widely used due to its superior properties such as low dosage, high water reducing rate, no segregation, no bleeding, good concrete slump performance, and good co...

AI Technical Summary

Problems solved by technology

The current water reducers mainly include: naphthalene series, melamine series, and sulfamic acid salt series, etc. The disadvantages mainly include: the concrete prepared by them has high viscosity, difficult pumping, and unfavorable construction

Polycarboxylate superplasticizer has been widely used due to its superior properties such as low dosage, high water reducing rate, no segregation, no bleeding, good concrete slump performance, and good compatibility with cement. However, Due to a series of factors such as geographical location, natural environment, and economic costs, some raw materials for concrete, such as sand and gravel, often have disadvantages such as excessive mud content and uneven particle size, which seriously affect the performance of concrete. In this case, the dosage can only be increased. Even so, the performance of concrete cannot be guaranteed, which not only increases the project cost but also affects the construction progress.

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