Comb-shaped graft copolymer cement dispersant

Abstract

The invention relates to a comb-shaped grafted copolymer cement dispersing agent. The comb-shaped grafted copolymer cement dispersing agent has the advantages of simple production technology, low mixing amount and high adaptability. The comb-shaped grafted copolymer cement dispersing agent is prepared through the following steps: preparing the comb-shaped grafted copolymer cement dispersing agent through the free radical copolymerization reaction of monomers A shown by a general formula (1) and monomers B shown by a general formula (2) in an aqueous medium; and setting the mol ratio of A to B to be 1:2 to 1:10. Amide nonionic base groups are introduced into the backbone of the grafted copolymer and are taken as the absorption base groups, thereby reducing the sensitivity of the grafted copolymer absorption characteristic to the variety and content of ions in the cement slurry, and consequently improving the adaptability of the grafted copolymer dispersing agent in the building engineering. The comb-shaped grafted copolymer cement dispersing agent has the advantages of simple production process, low mixing amount and high cement adaptability.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures in building materials, and in particular relates to a comb-shaped graft copolymer cement dispersant. Background technique [0002] Cement production not only consumes a lot of resources and energy, but also emits a lot of CO 2 and other harmful gases. At the same time, with the development of social economy, the discharge of solid waste such as slag, fly ash and coal gangue is increasing day by day, which not only occupies land, pollutes the environment, but also causes a huge waste of energy and resources. Reducing the amount of cement, maximizing the use of industrial waste, and prolonging the service life of concrete structures can not only effectively reduce environmental pollution, but also save land, energy and resources, which is conducive to the implementation of sustainable strategies. [0003] The development and application of high-performance admixtures is the most effect...

AI Technical Summary

Problems solved by technology

[0004] Although the excellent dispersibility and good slump retention ability of the new polycarboxylate admixture have been widely recognized by the industry, there are still concerns on the mineral composition of cement (mainly C 3 A and alkali content), cement fineness, gypsum form and content, admixture addition amount and addition method, mix ratio, water consumption, concrete mixing process and ambient temperature have extremely high sensitivity (R.Magarotto, F. Moratti, N. Zeminian. Influence of sulfates c

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