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Hyperbranched water-reducing viscosity-reducing concrete admixture and its preparation method and application

A concrete admixture and viscosity reduction technology, applied in the field of concrete admixtures, can solve the problems of poor controllability, expensive monomers, numerous reaction steps, etc., achieve large steric hindrance, high application value, improve adsorption force and space The effect of steric hindrance

Active Publication Date: 2022-05-03
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 viscosity-reducing concrete admixture and its preparation method and application
  • Hyperbranched water-reducing viscosity-reducing concrete admixture and its preparation method and application

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 concrete admixture as well as its preparation method and application. The preparation method of the hyperbranched water-reducing and viscosity-reducing concrete admixture includes the chemical reaction of monomer A and monomer B first. , introducing another double bond into the end of monomer A to obtain a double-terminal alkylene macromonomer, and then through the addition polymerization reaction of double-terminal alkylene macromonomer, monomer A, and monomer C, to obtain a hyperbranched Water-reducing and viscosity-reducing concrete admixture. The hyperbranched water-reducing and viscosity-reducing concrete admixture prepared by the present invention contains multiple comb-shaped structure PCEs, which can expose a large number of anchoring groups, can greatly improve the fluidity of concrete and reduce the viscosity of concrete, and the preparation method has mild synthesis conditions and monomer Wide range of sources, high yield, low dosage, high water-reducing rate and good viscosity-reducing properties, the admixture can be widely used in various concretes.

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