Viscosity reduction type polycarboxylate superplasticizer with microcrosslinking structure and preparation method of viscosity reduction type polycarboxylate superplasticizer

Abstract

The invention discloses a viscosity reduction type polycarboxylate superplasticizer with a microcrosslinking structure. The viscosity reduction type polycarboxylate superplasticizer is prepared from unsaturated acids, unsaturated anhydride, isopentene polyoxyethylene ether, a crosslinking agent and a reactive cosolvent as polymerization raw materials through free radical pauperization under actions of an initiator and chain transfer, components and structures take mutual synergetic effects into play, and compared with a viscosity reduction type polycarboxylate superplasticizer synthesized in the prior art, the viscosity reduction type polycarboxylate superplasticizer has an excellent viscosity reduction effect and has collapse prevention and regulation and control on early strength functions as well; meanwhile, due to introduction of the structure, the thickness of an adsorption layer on the surface of cement granules can be increased, the cement granule surface covering rate can be increased, the concentration of the polycarboxylate superplasticizer retained in a cement pore liquid can be reduced, surface activation performance of the polycarboxylate superplasticizer can be enhanced, and a good viscosity reduction effect can be achieved. Due to adoption of the reactive cosolvent, the intermiscibility of monomers can be effectively improved, and the polymerization efficiency ofa polymer and structure arrangement of effective molecules can be improved. Due to adoption of a bifunctionality crosslinking agent in the polycarboxylate superplasticizer, the molecular structure ofthe polycarboxylate superplasticizer can be improved, and the viscosity reduction performance of the polycarboxylate superplasticizer can be improved.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a cement-based material-based, viscosity-reducing polycarboxylate-based high-efficiency water reducer with a micro-crosslinked structure and a preparation method thereof. Background technique [0002] With the development of my country's construction industry, high-strength and ultra-high-strength concrete are gradually entering the construction market with the characteristics of high strength, good integrity and low self-weight, which can meet the needs of lightweight, high-rise, large-span and high durability in modern buildings and infrastructure construction. requirements of customization. However, due to the low water-binder ratio and the large amount of cementitious materials, the viscosity of the concrete mixture gradually increases, causing a series of construction problems such as concrete mixing, transportation, and pumping, which largely limits the high-stre...

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Problems solved by technology

The cross-linked viscosity-reducing polycarboxylate water-reducer formed by introducing the cross-linking agent, 2-methacryloyloxyethylphosphorylcholine into the structure of the polycarboxylate water-reducer can effectively reduce the viscosity of concrete, but cannot Intrinsically compare the effect of cross-linked structure, phosphate structure and choline structure on viscosity reduction performance

[0006] At present, the viscosity-reducing polycarboxylate superplasticizer has not been able to increase the thickness of the adsorption layer of the admixture on the surface of cement particles and reduce the residual polycarboxylate superplasticizer in the cement pore fluid from the molecular structure.

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