Hyperbranched water-reducing and viscosity-reducing concrete admixture, preparation method and application thereof

A concrete admixture and viscosity-reducing technology, which is applied in the field of concrete admixtures, can solve problems such as poor controllability, expensive monomers, and numerous reaction steps, and achieve large steric hindrance, high application value, and improved adsorption and space The effect of steric hindrance

Active Publication Date: 2021-09-07
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are mainly two types of synthetic methods for hyperbranched admixtures: the first type uses carboxyl groups (anchor groups) as active points, and introduces hyperbranched structures into comb-shaped polycarboxylic acid molecules under the premise of sacrificing adsorption capacity. The other type is usually to use special monomers or complex chemical reactions to prepare hyperbranched admixtures, which have the disadvantages of expensive monomers, many reaction steps, and poor controllability.

Method used

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  • Hyperbranched water-reducing and viscosity-reducing concrete admixture, preparation method and application thereof
  • Hyperbranched water-reducing and viscosity-reducing concrete admixture, preparation method and application thereof

Examples

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Embodiment 1

[0034] A preparation method of hyperbranched water-reducing viscosity-reducing concrete admixture of the present invention, comprises the following steps:

[0035] (1) Disperse 10g of isopentenyl polyethylene glycol and 1.5g of triethylamine in dichloromethane, stir magnetically for 10min, add 2g of acryloyl chloride dropwise in ice bath for 1h, move to room temperature, and stir magnetically After 24 hours of reaction, the clear liquid was collected after the reaction was completed, and the methylene chloride was removed by rotary evaporation to obtain a double-terminal alkylenated macromonomer;

[0036] (2) Dissolve 120g of isopentenyl polyethylene glycol in water, add 12g of double-terminal alkylenated macromonomer and 2.5g of hydrogen peroxide, stir for 2min to obtain the first mixed solution, dissolve 30g of acrylic acid and 1g of ascorbic acid Obtain the second mixed solution in water, dissolve 1.2g of 3-mercaptoacetic acid in water to obtain the third mixed solution, dr...

Embodiment 2

[0039] A preparation method of hyperbranched water-reducing viscosity-reducing concrete admixture of the present invention, comprises the following steps:

[0040] (1) Disperse 15g of methallyl polyvinyl ether and 2.0g of triethylamine in dichloromethane, stir magnetically for 15min, add 2.5g of methacryloyl chloride dropwise in ice bath for 1h, and move to room temperature , magnetically stirred and reacted for 12 hours. After the reaction, the clear liquid was collected, and the dichloromethane was removed by rotary evaporation to obtain a double-terminal alkylene macromonomer;

[0041] (2) Dissolve 100g of methallyl polyvinyl ether in water, add 17g of double-terminated alkylene macromonomer and 2.0g of hydrogen peroxide, stir for 3min to obtain the first mixed solution, mix 35g of acrylic acid with 0.7g of ascorbic acid Dissolve in water to obtain the second mixed solution, dissolve 1.0g mercaptoacetic acid in water to obtain the third mixed solution, drop the second mixed...

Embodiment 3

[0043] A preparation method of hyperbranched water-reducing viscosity-reducing concrete admixture of the present invention, comprises the following steps:

[0044] (1) Disperse 20g of isopentenyl polyethylene glycol and 3.5g of triethylamine in dichloromethane, stir magnetically for 20min, add 3g of acrylamide dropwise in ice bath for 1h, move to room temperature, and stir magnetically After reacting for 20 hours, the clear liquid was collected after the reaction was completed, and the dichloromethane was removed by rotary evaporation to obtain a double-terminal alkylenated macromonomer;

[0045] (2) Dissolve 150g of isopentenyl polyethylene glycol in water, add 26g of double-terminal alkylenated macromonomer and 1.5g of sodium persulfate, stir for 1min, obtain the first mixed solution, and mix 40g of maleic anhydride with 2g ammonium persulfate is dissolved in water to obtain the second mixed solution, 0.8g mercaptopropanol is dissolved in water to obtain the third mixed solu...

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Abstract

The invention discloses a hyperbranched water-reducing and viscosity-reducing type concrete admixture, a preparation method and application thereof. The preparation method of the hyperbranched water-reducing and viscosity-reducing type concrete admixture comprises the steps: through chemical reaction of a monomer A and a monomer B, introducing another double bond to the tail end of the monomer A to prepare a double-end-group alkylene macromonomer; and carrying out addition polymerization reaction on the double-end-group alkylene macromonomer, the monomer A and the monomer C to prepare the hyperbranched water-reducing viscosity-reducing concrete admixture. According to the invention, the hyperbranched water-reducing and viscosity-reducing concrete admixture prepared by the invention contains a plurality of comb-shaped structure PCE, so that a large number of anchoring groups can be exposed, the fluidity of concrete can be greatly improved, and the viscosity of concrete can be greatly reduced; the preparation method is mild in synthesis condition, the monomer source is wide, the yield is high, the mixing amount is low, the water-reducing rate is high, and the viscosity reduction is good; and the admixture can be widely applied to various types of concrete.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a hyperbranched water-reducing and viscosity-reducing concrete admixture and its preparation method and application. Background technique [0002] At present, the conventional admixtures used to improve the working performance of concrete include polycarboxylate water reducers. Based on the theory of adsorption and steric hindrance effect, the anchoring group on the main chain of polycarboxylate superplasticizer is adsorbed on the surface of cement particles, and its long hydrophilic side chain produces steric hindrance effect, thus playing the role of dispersing cement particles. However, the side chain of polycarboxylate superplasticizer is easy to curl, the growth of steric hindrance effect is limited, and its bulk viscosity is high. After mixing, it will increase the viscosity of concrete, which is difficult to meet the requirements of polycarboxylate superplasticizer in ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/32C08F283/06C08F220/06
CPCC04B24/32C08F283/065C04B2103/46C08F220/06
Inventor 元强姚灏王辉
Owner CENT SOUTH UNIV
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