Method for synthesizing polycarboxylate superplasticizer through binary copolymerization of 6C polyether macromonomer under heterogeneous catalysis by cobalt oxide

Abstract

The invention discloses a method for synthesizing a polycarboxylate superplasticizer through binary copolymerization of 6C polyether macromonomer under heterogeneous catalysis by cobalt oxide. The method is characterized by comprising the following steps: weighing raw materials including a macromonomer, a small monomer, a chain transfer agent, a reducing agent, an oxidizing agent, a catalyst and water, mixing the small monomers and the water to prepare a solution A, and mixing the reducing agent, the chain transfer agent and the water to prepare a solution B, adding the solution C into the solution B, wherein the macromonomer is diethylene glycol monovinyl ether; and adding the macromonomer and the water into a reactor with a thermometer, controlling a temperature to be 0-20 DEG C, adding the catalyst and the water, conducting stirring and mixing, adding the oxidizing agent and the water, performing mixing and stirring, dropwise adding the solution A and the solution B at a constant speed at the same time, and carrying out a heat-preserved reaction, wherein the total time of dropwise addition and reaction is 1-2 hours. The polycarboxylate superplasticizer prepared through binary copolymerization of 6C polyether macromonomer under heterogeneous catalysis by cobalt oxide is especially suitable for concrete preparation, and has the advantages of excellent cement dispersion performance and aging slump retaining performance, good compressive strength and durability, and strong practicability.

Description

technical field [0001] The invention belongs to the preparation of water reducers, and relates to a method for heterogeneously catalyzed binary copolymerization of cobalt oxide of 6C polyether macromonomers into polycarboxylate water reducers. The cobalt oxide heterogeneously catalyzed binary copolymerization of the 6C polyether macromonomer (namely: diethylene glycol monovinyl ether) 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 utilizatio...

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 retention performance of the product are also insufficient

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