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Viscosity modifier for concrete and preparation method thereof

A viscosity regulator and concrete technology, applied in the field of concrete admixtures, can solve the problems of poor compatibility of polycarboxylate superplasticizers, etc., and achieve the effects of facilitating the development of mechanical strength, solving poor compatibility and large steric hindrance

Active Publication Date: 2021-05-18
广东鼎基建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this patent uses similar structural units to polycarboxylate superplasticizers to solve the technical problem of poor compatibility between traditional viscosity modifiers and polycarboxylate superplasticizers, the problem that exists at the same time is that it cannot solve the problem of polycarboxylate superplasticizers. The problem of bleeding and segregation caused by water reducing agent often needs to add a larger amount to achieve the matching effect

Method used

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  • Viscosity modifier for concrete and preparation method thereof
  • Viscosity modifier for concrete and preparation method thereof

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Effect test

Embodiment 1

[0030] A kind of preparation method of concrete viscosity modifier of the present embodiment, comprises following preparation steps:

[0031] (1) The molar ratios of γ-methacryloxypropyltrimethoxysilane and heptadecylfluorodecyltrimethoxysilane are 1:1, 1:1.5, 1:2, 1:2.5, 1 :3 and 1:4 were added to the isopropanol solvent, stirred and dissolved evenly, deionized water was added dropwise at room temperature for hydrolysis and polycondensation, after the reaction was completed, the low boilers were evaporated under reduced pressure to obtain silane-modified monomers.

[0032] The morphology / viscosity (mPa·s), average molecular weight, and yield of the silane-modified monomers were measured at different molar ratios, and the results are shown in Table 1 below.

[0033] Table 1

[0034] 1:1 1:1.5 1:2 1:2.5 1:3 1:4 Form / Viscosity gelation 14000 520 330 190 120 molecular weight 230,000 28000 7400 3500 1800 880 Yield 96％ 95％ 95％ 93％ 8...

Embodiment 2

[0038] A kind of preparation method of concrete viscosity modifier of the present embodiment, comprises following preparation steps:

[0039] (1) Add γ-methacryloxypropyltrimethoxysilane to heptadecylfluorodecyltrimethoxysilane with a molar ratio of 1:2.5 into the isopropanol solvent, stir and dissolve evenly, add dropwise at room temperature Deionized water is used for hydrolysis and polycondensation, and after the reaction is completed, the low boilers are evaporated under reduced pressure to obtain a silane-modified monomer.

[0040] (2) Add acrylic acid, acrylamide, N,N'-methylenebisacrylamide and peroxide initiator ammonium persulfate into water and stir to dissolve evenly, then pass nitrogen to remove oxygen and heat up to 40-70°C, drop Add a mixed solution containing silane-modified monomer (1:2.5 product) and reducing agent sodium hypophosphite for copolymerization, wherein the mass ratio of acrylic acid to acrylamide is 1:2, N,N'-methylenebispropylene The addition am...

Embodiment 3

[0042] A kind of preparation method of concrete viscosity modifier of the present embodiment, comprises following preparation steps:

[0043] (1) Add γ-methacryloxypropyltrimethoxysilane to heptadecylfluorodecyltrimethoxysilane with a molar ratio of 1:2.5 into the isopropanol solvent, stir and dissolve evenly, add dropwise at room temperature Deionized water is used for hydrolysis and polycondensation, and after the reaction is completed, the low boilers are evaporated under reduced pressure to obtain a silane-modified monomer.

[0044](2) Add acrylic acid, acrylamide, N,N'-methylenebisacrylamide and peroxide initiator ammonium persulfate into water and stir to dissolve evenly, then pass nitrogen to remove oxygen and heat up to 40-70°C, drop Add a mixed solution containing silane-modified monomer (1:2.5 product) and reducing agent sodium hypophosphite for copolymerization, wherein the mass ratio of acrylic acid to acrylamide is 1:2, N,N'-methylenebispropylene The addition amo...

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Abstract

The invention belongs to the technical field of concrete admixtures, and discloses a viscosity modifier for concrete and a preparation method of the viscosity modifier. The preparation method comprises the following steps: carrying out hydrolytic polycondensation on a vinyl silane coupling agent and a fluorosilane coupling agent in an isopropanol solvent at normal temperature to obtain a silane modified monomer; adding unsaturated carboxylic acid, unsaturated amide, an internal cross-linking agent and a peroxide initiator into water, uniformly stirring and dissolving, introducing nitrogen to remove oxygen, heating to 40-70 DEG C, dropwise adding a mixed solution containing a silane modified monomer and a reducing agent, carrying out a copolymerization reaction, cooling to room temperature after the reaction, and adding alkali for neutralization to obtain the viscosity modifier for concrete. The viscosity modifier disclosed by the invention can be used for improving the problems of bleeding and segregation caused by a polycarboxylic acid water reducing agent, has a remarkable tackifying effect and a peaceability improving effect, and has a certain effect of improving the early strength of concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a viscosity regulator for concrete and a preparation method thereof. Background technique [0002] With the development of large-scale and high-rise concrete structures, the demand for high-performance high-strength, ultra-high-strength concrete, and high-fluidity concrete in building construction is increasing. Under the condition of not changing the mix ratio of high-strength concrete, its working performance is often improved by increasing the amount of polycarboxylate superplasticizer. Polycarboxylate superplasticizer has the advantages of high water reducing rate, good slump retention performance, low concrete shrinkage rate, and environmental protection, but it will lead to problems such as poor cohesion, bleeding, and segregation of concrete. In addition, medium and low-grade concrete is highly sensitive to the addition of superplasticizers, and concrete may a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/12C08F220/06C08F220/56C08F222/38C04B24/42C04B103/44
CPCC08F283/124C04B24/42C04B2103/44C08F220/06C08F220/56C08F222/385
Inventor 李桂青卢才能吴文华星耀
Owner 广东鼎基建材科技有限公司
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