The method for synthesizing cement dispersant of acrylamide-fatty acid vinyl ester graft copolymer

Abstract

The invention relates to a method for synthesizing cement disperser from an acrylamide-fatty acid vinyl ester graft copolymer. The method comprises the following steps: taking acrylamide and fatty acid vinyl ester as main reaction raw materials, and compounding a cement disperser by using the acrylamide-fatty acid vinyl ester graft copolymer prepared from a method of polymerizing, grafting, alcoholysis reacting and hydrolyzing, namely taking the acrylamide as a reaction monomer, polymerizing under the effect of an initiator and a molecular weight modifier, and grafting and polymerizing with the fatty acid vinyl ester to obtain a grafting copolymer, and performing alcoholysis reaction and hydrolyzation on the grafting copolymer to obtain the cement disperser in a structure with the main chain of polyacrylic acid and side chain of polyvinyl alcohol. The preparation method is simple in process, easy to control and low in cost. The fatty acid vinyl ester is adopted to substitute the current important compound materials of the cement disperser, namely ethylene oxide and propylene epoxide. The prepared cement disperser has excellent cement paste mobility and holding capacity and shows good cement adaptability and concrete application performance.

Description

technical field [0001] The invention relates to the technical field of a dispersant for cement concrete, in particular to a dispersant that uses acrylamide monomers to self-polymerize first, then graft copolymerize with fatty acid vinyl ester, and finally alcoholyze and hydrolyze to form a comb-like structure The specific synthesis method of cement dispersant. Background technique [0002] In recent years, with the rapid development of the construction industry, the amount of concrete and cement has been increasing, and the cement dispersant has become one of the very important components in the construction industry. Good slump performance, fast strength growth, strong adaptability and other advantages have become a hot spot in the research and development of concrete admixtures. However, polyoxyethylene ether, an important macromonomer for the synthesis of polycarboxylate superplasticizers, is mainly made of ethylene oxide and propylene oxide. The types of raw materials a...

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Problems solved by technology

However, the above-mentioned preparation methods all have a certain degree of inadequacy. The macromonomers used in the synthesis of water reducers all need ethylene oxide or propylene oxide to make, and the raw material species are too single. The supply of propane is difficult, and the production of the existing polycarboxylate superplasticizer is bound to be restricted to a certain extent, which will affect the concrete industry and cause great losses

Therefore, it is required to find substitutes for ethylene oxide and propylene oxide as soon as possible, to enrich the types of raw materials, and to play their role in the structure of the water reducer, to maintain its excellent performance, and to ensure fast Simple process operation and low preparation cost, easy to industrialized production, there is no report on this aspect of work at home and abroad

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