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

Abstract

The invention discloses a method for synthesizing a polycarboxylate superplasticizer by nickel oxide heterogeneous catalysis binary copolymerization of 6C polyether macromonomer. The method is characterized by comprising the following steps: taking raw materials of a macromonomer, a small monomer, a chain transfer agent, a reducing agent, an oxidizing agent, a catalyst and water, and mixing the small monomer with the water to prepare a solution A; mixing the reducing agent, the chain transfer agent and water to prepare a solution B; and adding the macromonomer and water into a reactor with a thermometer, cooling and stirring, when the temperature is controlled to 0-15 DEG C and the macromonomer is completely dissolved, adding the catalyst and water, mixing, adding the oxidizing agent and water, mixing, simultaneously dropwise adding the solution A and the solution B at a constant speed for 1-2 hours, and standing the reacted material to room temperature, thereby obtaining the polycarboxylate superplasticizer. The polycarboxylate superplasticizer prepared by the invention is suitable for preparation of concrete, and has the characteristics of simple production conditions, industrial production, excellent cement dispersing performance and long-term slump retaining performance, good compressive strength and durability and the like.

Description

technical field [0001] The invention belongs to a method for preparing a water reducer, and relates to a method for producing a polycarboxylate water reducer by nickel oxide heterogeneously catalyzed binary copolymerization of a 6C polyether macromonomer (ie: diethylene glycol monovinyl ether) . The polycarboxylate water reducer prepared by the invention is suitable for the preparation of concrete. 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 in the development of concrete technology. 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% is one of the important technical ways to reduce the amount of cement, improve the utilization rate of i...

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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