Method for catalytically synthesizing polycarboxylate superplasticizer by magnesium oxide, aluminum oxide or copper oxide

Abstract

The invention discloses a method for catalytically synthesizing a polycarboxylate superplasticizer by magnesium oxide, aluminum oxide or copper oxide, which is characterized by comprising the following steps of: taking raw materials of a macromonomer, a micromonomer, a chain transfer agent, a reducing agent, an oxidizing agent, a catalyst and water, mixing the micromonomer with the water to prepare a solution A, mixing the reducing agent, the chain transfer agent and the water to prepare a solution B, wherein the macromonomer is Diethylene Glycol Monovinyl Ether, the catalyst is magnesium oxide, aluminum oxide or copper oxide; adding the macromonomer and water into a reactor, controlling the temperature to be 2-28 DEG C, adding the catalyst and the oxidizing agent, adding the solution A and the solution B dropwise, controlling the total time of dropwise adding and heat preservation reaction at the temperature of 2-28 DEG C to be 1-2 h, and preparing the polycarboxylate superplasticizer . The prepared polycarboxylate superplasticizer is particularly suitable for concrete preparation, has the characteristics of high dispersity, good slump retaining performance, high compressive strength, good durability and the like, and is high in practicability.

Description

technical field [0001] The invention belongs to the preparation of water reducers, and relates to a method for synthesizing polycarboxylate water reducers by catalyzing magnesium oxide, aluminum oxide or copper oxide. The polycarboxylate water reducer prepared by the invention is suitable for concrete preparation. Background technique [0002] The development of modern concrete admixture technology is the key to the development of modern concrete technology and plays a decisive role. Concrete admixture is an essential component in modern concrete except cement, sand, stone, water, and admixtures, especially the third-generation polycarboxylate high-performance admixture, which accounts for 10% of the amount of concrete admixture used. About 80%, it is one of the important technical ways to reduce the amount of cement, improve the utilization rate of industrial waste residue, and realize the durability and high performance of concrete. Polycarboxylate high-efficiency water ...

AI Technical Summary

Problems solved by technology

In the process of free radical polymerization to prepare polycarboxylate superplasticizers, the activity of polyether macromonomers is much lower than that of small molecular unsaturated carboxylic acid monomers; Copolymerization can only prolong the dropping time of small molecular monomers, so the preparation time of polycarboxylate water reducer is generally more than 3 hours; use heating method to synthesize polycarboxylate water reducer, the polymerization reaction temperature is usually 40~60℃ , Higher temperature increases energy consumption and production cost, thereby reducing the market competitiveness of the product, and the dispersion performance and slump performance of the mixed product also have deficiencies.

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