Comb-shaped graft copolymer cement dispersant and composite cement dispersant

Abstract

The invention provides a comb-shaped graft copolymer cement dispersant, which has the advantages of low mixing amount and strong temperature adaptability. The invention also provides a composite cement dispersant which comprises the comb-shaped graft copolymer cement dispersant. The comb-shaped graft copolymer cement dispersant is prepared through radical copolyreaction between unsaturated monomerand aqueous medium; the unsaturated monomer comprises unsaturated polyether macromer A and unsaturated phosphonate monomer B, wherein the unsaturated polyether macromer A is presented by a general formula (1), and the unsaturated phosphonate monomer B is presented by a general formula (2) or a general formula (3). The composite cement dispersant comprises the comb-shaped graft copolymer cement dispersant, and also comprises polycarboxylic acid admixture shown by a general formula (4), a general formula (5), a general formula (6) or a general formula (7). In the invention, water is used as medium, and a simple copolymerization technology is adopted for obtaining the comb-shaped graft copolymer cement dispersant with low mixing amount. The dispersibility of the comb-shaped graft copolymer cement dispersant is little influenced by the concentration of SO4<2-> and the temperature so that the comb-shaped graft copolymer cement dispersant has favorable adaptability for cement and environment.

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 and a composite 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-perform...

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Problems solved by technology

[0008] In summary, although these prior art are effective for improving the

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