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Viscosity-reducing shrinkage-reducing polycarboxylic acid water reducer and preparation method thereof

A technology of polycarboxylic acid and water reducer, which is applied in the field of concrete admixtures, can solve the problems of difficult pumping, high-strength or ultra-high-strength concrete viscosity, etc., and achieve the effects of improving appearance, reducing concrete viscosity, and improving durability

Pending Publication Date: 2022-03-01
SHAANXI KZJ NEW MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the problems of high-strength or ultra-high-strength concrete with high viscosity and difficult pumping mentioned in the above-mentioned prior art, the present invention provides a viscosity-reducing and shrinkage-reducing polycarboxylate water-reducer, which is composed of unsaturated polyether monomers, unsaturated It is prepared by copolymerization of saturated acid, cross-linking monomer, unsaturated sulfonate and esterification product;

Method used

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  • Viscosity-reducing shrinkage-reducing polycarboxylic acid water reducer and preparation method thereof
  • Viscosity-reducing shrinkage-reducing polycarboxylic acid water reducer and preparation method thereof

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preparation example Construction

[0026] The invention provides a specific implementation and preparation method of a viscosity-reducing and shrinkage-reducing polycarboxylate superplasticizer, comprising the following steps:

[0027] (1) Esterification reaction: mix gallic acid and hydroxy vinyl ether in a certain proportion, add catalyst and polymerization inhibitor, and carry out esterification reaction at 80°C-120°C for 4h-5h under the protection of nitrogen to obtain Esterification products;

[0028] Wherein, the molar ratio of gallic acid and hydroxy vinyl ether is 1: (2-4); the catalyst consumption accounts for 1% to 3% of the total mass of gallic acid and hydroxy vinyl ether; the polymerization inhibitor consumption Accounting for 0.1% to 2% of the total mass of gallic acid and hydroxyvinyl ether;

[0029] The hydroxy vinyl ether is selected from one of 4-hydroxybutyl vinyl ether, diethylene glycol monovinyl ether, ethylene glycol vinyl ether, cyclohexyl-1,4-dimethylol monovinyl ether or A variety of...

Embodiment 1

[0043] (1) Esterification reaction: blend gallic acid and 4-hydroxybutyl vinyl ether in a molar ratio of 1:2, and add 3% p-toluenesulfonate accounting for the total mass of gallic acid and 4-hydroxybutyl vinyl ether Acid and 0.5% hydroquinone, continuously blowing nitrogen gas, carry out esterification reaction at 120° C. for 4 hours, and obtain the esterification product.

[0044] (2) Copolymerization reaction: in parts by mass, add 50 parts of isopentenyl polyoxyethylene polyoxypropylene ether (molecular weight: 1000) and 25 parts of water into the reactor, and after stirring and dispersing evenly, add 2 parts of hydrogen peroxide, the reaction temperature is 25°C, after 10 minutes, add solution B and solution C dropwise;

[0045] Wherein, solution B is that 10 parts of mass concentrations are 10% sodium hypophosphite solution; Solution C is 10 parts of esterification products, 5 parts of polyethylene glycol maleic acid monoester (polyethylene glycol is PEG-400), 3 parts A ...

Embodiment 2

[0048] (1) Esterification reaction: blend gallic acid and diethylene glycol monovinyl ether in a molar ratio of 1:3, add concentrated sulfuric acid and 1% of the total mass of gallic acid and diethylene glycol monovinyl ether 0.1% of phenothiazine, continue to feed nitrogen, carry out esterification reaction at 110° C. for 4 hours, and obtain the esterified product.

[0049] (2) Copolymerization reaction: In parts by mass, 80 parts of methallyl polyoxyethylene polyoxypropylene ether (molecular weight is 500) and 40 parts of water are added to the reactor, and after stirring and dispersing evenly, one-time Add 1 part of hydrogen peroxide, the reaction temperature is 20°C, after 10 minutes, add solution B and solution C dropwise;

[0050] Wherein, solution B is the L-ascorbic acid solution that 1 part of mass concentration is 10%; Solution C is 5 parts of esterification products, 4 parts of polyethylene glycol monoacrylates (polyethylene glycol is PEG-600), 4 parts of formazan ...

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Abstract

The invention relates to the technical field of concrete admixtures, in particular to a viscosity reduction and shrinkage reduction type polycarboxylic acid water reducer and a preparation method thereof. The viscosity reduction and shrinkage reduction type polycarboxylic acid water reducer is prepared by copolymerizing an unsaturated polyether monomer, unsaturated acid, a crosslinking monomer, unsaturated sulfonate and an esterification product, the esterification product is prepared by carrying out esterification reaction on gallic acid and hydroxyl vinyl ether. The viscosity reduction and shrinkage reduction type polycarboxylic acid water reducer can effectively reduce the viscosity of high-grade concrete, reduce the later shrinkage of the concrete and improve the construction efficiency of the concrete and the durability of a concrete structure.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a viscosity-reducing and shrinkage-reducing polycarboxylate water reducer and a preparation method thereof. Background technique [0002] With the rapid development of the domestic construction industry, the strength level of concrete is also increasing. High-strength and ultra-high-strength concrete have been gradually used in construction projects. Large and difficult to pump, it is difficult to apply large-scale construction objects such as high-rise buildings and large-volume structures. Therefore, the market demand for high-strength concrete viscosity reducers continues to rise. [0003] In recent years, in response to the viscosity problem of high-strength concrete, the industry generally adopts adjusting the concrete mix ratio and improving the quality of concrete adhesive aggregate to solve the problem. However, the viscosity reduction effect of this method is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F228/02C08F220/06C08F220/04C08F216/14C08F222/02C08F220/58C04B24/16C04B103/30
CPCC08F283/065C04B24/165C04B2103/302C08F228/02C08F220/06C08F220/04C08F216/1416C08F222/02C08F220/585C08F216/1475
Inventor 刘博博安小强苗东辉贺冲陈长军
Owner SHAANXI KZJ NEW MATERIALS
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