Preparation method of concrete thickener

Abstract

The invention discloses a preparation method of a concrete thickener. The preparation method of the concrete thickener comprises subjecting small unsaturated amide monomers, small unsaturated hydroxyl-ester monomers and small unsaturated sulfoacid monomers to aqueous phase radical polymerization under the combined action of a redox system composed of initiating agent and reducing agent to obtain polymerized products; adjusting the PH of the polymerized products to be 6-7; adding water into the polymerized water to obtain the concrete thickener at a concentration of 3-10wt%. According to the preparation method of the concrete thickener, the product performance can be adjusted by controlling the molecular weight of the polymerized products, so that high reaction velocity can be obtained, organic solvent can be omitted, and being non-toxic and pollution-free and simple in operation can be achieved. The concrete thickener prepared through the method can avoid segregation under the premise of achieving high water retention, thereby guaranteeing the slump resisting performance of concrete and achieving stable product performance.

Description

technical field [0001] The invention relates to a preparation method of a concrete thickener, in particular to a specific synthesis method for preparing a concrete thickener by radical polymerization. Background technique [0002] Concrete thickener was first successfully developed by West Germany in 1974, and was officially applied in engineering in 1977. Japan introduced German patents in 1978 to continue research. At present, more than ten companies have developed more than ten kinds of thickener products, with a project volume of several million square meters. In 1984, the my country Petroleum Research Institute successfully developed a propylene series anti-dispersant, named UWB water-retaining agent, and launched a SCR cellulose series thickener, which was used in many large-scale projects and achieved good social and economic benefits. results. [0003] From the perspective of chemical composition, thickeners are mainly polymer additives, which are divided into sever...

AI Technical Summary

Problems solved by technology

Most of the viscosity modifiers can effectively reduce bleeding on the one hand, but on the other hand, it will reduce the slump expansion of concrete, increase the water demand, and need to add more water reducers to maintain the required slump , and most of them have poor compatibility with polycarboxylate superplasticizers, which increases the difficulty of construction and significantly limits their application

Existing viscosity modifiers such as cellulose ether have slow dissolution rate, high price, slow dissolution rate, and reduce bleeding while reducing slump, increasing construction difficulty, and low market acceptance rate

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