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Ester-ether mixed viscosity-reducing polycarboxylic acid water reducer and preparation method thereof

A viscous polycarboxylate and hybrid technology, 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., to improve appearance, improve slump performance, and increase space The effect of resistance

Pending Publication Date: 2022-03-15
SHAANXI KZJ NEW MATERIALS +1
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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 an ester-ether mixed viscosity-reducing polycarboxylate water reducer, which is composed of unsaturated polyether mono It is prepared by copolymerization of body, unsaturated acid, cross-linking monomer and esterification product;

Method used

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  • Ester-ether mixed viscosity-reducing polycarboxylic acid water reducer and preparation method thereof
  • Ester-ether mixed viscosity-reducing polycarboxylic acid water reducer and preparation method thereof

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preparation example Construction

[0026] The invention provides a method for preparing an ester-ether mixed viscosity-reducing polycarboxylate water-reducer, which specifically includes the following steps:

[0027] (1) Esterification reaction: Mix gallic acid and allyl alcohol monomers in a certain proportion, add catalyst and polymerization inhibitor, and carry out esterification reaction at 80°C to 120°C for 4h to 5h under the protection of nitrogen. That is, the esterification product is obtained;

[0028] Wherein, the molar ratio of the gallic acid and the allyl alcohol monomer is 1: (2-4); the amount of the catalyst accounts for 1% to 3% of the total mass of the gallic acid and the allyl alcohol monomer; The amount of the polymerization inhibitor accounts for 0.1% to 2% of the total mass of gallic acid and allyl alcohol monomers;

[0029] Allyl alcohol monomers are selected from 2-methyl allyl alcohol, 3-methyl allyl alcohol, 2-chloro-2-propen-1-alcohol, 3-chloro allyl alcohol, 2-bromo-2- Propylene-1-o...

Embodiment 1

[0040] (1) Esterification reaction: blend gallic acid and 2-methallyl alcohol in a molar ratio of 1:2, add 3% p-toluenesulfonic acid and 0.5% of the total mass of gallic acid and 4-vinylbenzoic acid % of hydroquinone, continue to feed nitrogen, carry out esterification reaction at 120 ° C for 4 hours, and obtain the esterification product.

[0041] (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;

[0042] 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), 6 parts A solution of 1 part cinnamic acid, ...

Embodiment 2

[0045] (1) Esterification reaction: blend gallic acid and 2-chloro-2-propen-1-ol in a molar ratio of 1:3, add concentrated sulfuric acid accounting for 1% of the total mass of gallic acid and 4-vinylphenylacetic acid and 0.1% phenothiazine, and continuously feed nitrogen, and perform esterification reaction at 110° C. for 4 hours to obtain an esterified product.

[0046] (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;

[0047] Wherein, solution B is the L-ascorbic acid solution that 1 part of mass concentration is 10%; Solution C is 5 parts of esterification product, 4 parts of polyethylene glycol maleic acid monoester (polyethylene glycol is PEG-600), 5 parts A solutio...

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Abstract

The invention relates to the technical field of concrete admixtures, in particular to an ester-ether mixed viscosity reduction type polycarboxylic acid water reducer and a preparation method thereof. The ester-ether mixed viscosity reduction type polycarboxylic acid water reducer is prepared by copolymerizing unsaturated polyether monomers, unsaturated acid, crosslinking monomers and esterification products, the esterification product is prepared by carrying out esterification reaction on gallic acid and an allyl alcohol monomer. The ester-ether mixed viscosity reduction type polycarboxylic acid water reducer can effectively reduce the viscosity of high-grade concrete, is beneficial to pumping of high-strength concrete, ultrahigh-strength concrete, UHPC (Ultra High Performance Concrete) and the like, realizes pumping construction of the high-strength concrete, and effectively improves the concrete construction efficiency; meanwhile, the workability of the concrete can be improved, and the problems of layering, bleeding and the like of the concrete are avoided; the slump retaining performance of the concrete can be improved, and the slump loss is reduced.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to an ester-ether mixed viscosity-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 not...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F218/12C08F222/16C08F220/06C08F220/04C04B24/26C04B103/30
CPCC08F283/065C04B24/2694C04B2103/302C08F218/12C08F222/16C08F220/06C08F220/04
Inventor 柯余良杨浩苗东辉余抗建陈长军
Owner SHAANXI KZJ NEW MATERIALS
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