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

A viscous polycarboxylic acid and micro-crosslinking technology, applied in the field of concrete admixtures, can solve the problems of increasing the thickness of the admixture adsorption layer on the surface of cement particles, reducing the viscosity of concrete, etc., to improve the polymerization efficiency and effective molecular structure arrangement, The effect of reducing the viscosity and increasing the thickness of the adsorption layer

Active Publication Date: 2020-02-14
CHINA WEST CONSTR GRP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A micro-crosslinked viscosity-reducing polycarboxylate water reducer, the mass percentage of the monomer components used in the polymerization reaction: 6% of unsaturated carboxylic acid, 1.3% of unsaturated acid anhydride, 91% of isopentenol polyoxyethylene ether , crosslinking agent 1.2%, reactive co-solvent 0.5%, the total is 100%. The preparation method steps are as follows:

[0031] S1. Weigh 202g of prenol polyoxyethylene ether monomer with a molecular weight of 2400 and 2.88g of maleic anhydride in 205g of deionized water, raise the temperature to 50°C and keep the temperature constant to obtain solution A.

[0032] S2. Weigh 13.3g of acrylic acid, 2.66g of N,N'-methylenebisacrylic acid amide, 1.1g of hydroxyethyl acrylate and 0.38g of chain transfer agent mercaptoethanol, and dissolve them in 30g of water to obtain solution B.

[0033] S3. Weighing 1.66g of ammonium persulfate and 0.36g of azobisisobutylamidine hydrochloride were dissolved in 30g of water to ob...

Embodiment 2

[0039] A micro-crosslinked viscosity-reducing polycarboxylate water reducer, the mass percentage of the monomer components used in the polymerization reaction: 5.7% unsaturated carboxylic acid, 2.4% unsaturated acid anhydride, 90% isopentenol polyoxyethylene ether , crosslinking agent 1.4%, reactive co-solvent 0.5%, the total is 100%. The preparation method steps are as follows:

[0040] S1. Weigh 200g of isopentenol polyoxyethylene ether monomer with a molecular weight of 2400 and 5.33g of maleic anhydride, dissolve it in 205g of deionized water, raise the temperature to 50°C and keep the temperature constant to obtain solution A.

[0041] S2. Weigh 12.65g of acrylic acid, 3.1g of N,N'-(1,2-dihydroxyethylene) diacrylamide, 0.89g of hydroxyethyl acrylate and 0.38g of chain transfer agent thioglycolic acid, and dissolve them in 30g of water to obtain a mixed solution B;

[0042] S3. Weighing 1.46g of ammonium persulfate and 0.4g of sodium persulfate were dissolved in 30g of wa...

Embodiment 3

[0048] A micro-crosslinked viscosity-reducing polycarboxylate water reducer, the mass percentage of the monomer components used in the polymerization reaction: 5.7% of unsaturated carboxylic acid, 2.1% of unsaturated anhydride, 87.2% of isopentenol polyoxyethylene ether , crosslinking agent 4.5%, reactive co-solvent 0.5%, the total is 100%. The preparation method steps are as follows:

[0049] S1. Weigh 193g of prenol polyoxyethylene ether monomer with a molecular weight of 2400 and 3.33g of maleic anhydride in 205g of deionized water, heat up to 50°C and keep the temperature constant to obtain solution A.

[0050] S2. Weigh 12.65g of fumaric acid, 10g of diethylene glycol methacrylate phosphate, 0.89g of hydroxypropyl methacrylate and 0.38g of chain transfer agent mercaptopropionic acid, and dissolve them in 30g of water to obtain solution B.

[0051] S3. Dissolve 1.48g of potassium persulfate and 0.2g of azobisisoheptanonitrile in 30g of water to obtain solution C.

[0052...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/38C08F220/20C08F222/06C08F230/02C08F222/02C04B24/26C04B103/30
CPCC08F283/065C04B24/2694C04B2103/302C08F220/06C08F222/385C08F220/20C08F222/06C08F230/02C08F222/02
Inventor 陈景王军王福涛刘明毕耀刘其彬曾超叶子张磊罗杰袁彬钦
Owner CHINA WEST CONSTR GRP
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