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Viscosity reduction type polycarboxylate superplasticizer and preparation method thereof

A viscous polycarboxylate and water reducing agent technology, applied in the field of concrete admixtures, can solve the problems of reducing polycarboxylate coating and adsorption capacity, low hydrophilicity and strong rigid side chain, high viscosity, etc., to achieve suitable Large-scale production, reduced coating effect, reduced bridging effect

Inactive Publication Date: 2021-09-07
武汉优城科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the prior art, by adding unsaturated vinyl ether in the raw material to replace the traditional polyoxyethylene ether, to obtain a polycarboxylate water-reducing polycarboxylate with low hydrophilicity and strong rigid side chain agent, which reduces the ability of polycarboxylic acid to cover and absorb water molecules, thus effectively solving the problem of high viscosity of high-grade concrete

Method used

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  • Viscosity reduction type polycarboxylate superplasticizer and preparation method thereof

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Embodiment 1

[0031] This embodiment provides a viscosity-reducing polycarboxylate water reducer and its preparation method, specifically:

[0032] S1, the unsaturated vinyl ether (R 1 is methylene, R 2 for C 30 alkylene) and deionized water into the reactor for stirring and dissolving, while raising the temperature of the reactor to 30°C;

[0033] S2. Dissolving acrylic acid, vinylphosphonic acid and 2-methyl-2-acrylic acid-2-sulfoethyl ester in deionized water to obtain liquid A, dissolving ascorbic acid and thioglycolic acid in deionized water to obtain liquid B;

[0034] S3, add hydrogen peroxide to the reactor described in step S1, and start dropping A liquid and B liquid simultaneously after 10min, and the time of adding A liquid and B liquid is 2h, keep warm for 1h after dropping ;

[0035] S4. Add NaOH solution to the reactor to adjust the pH to 6, and add water to adjust the solid content to 40%, to obtain the viscosity-reducing polycarboxylate superplasticizer.

[0036] The m...

Embodiment 2

[0038] The difference between this embodiment and embodiment 1 is: The mass ratio is 100:4:4:4:1:0.3:1.

Embodiment 3

[0040] The difference between this embodiment and embodiment 1 is: The mass ratio is 100:6:6:6:1:0.3:1.

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Abstract

The invention discloses a viscosity reduction type polycarboxylate superplasticizer and a preparation method thereof. The polycarboxylate superplasticizer is prepared from unsaturated vinyl ether, an unsaturated carboxylic acid monomer and a derivative thereof, an unsaturated phosphonic acid monomer and an unsaturated sulfonic acid monomer through free radical polymerization. The unsaturated vinyl ether with long-chain alkyl is used as a preparation raw material of the polycarboxylate superplasticizer, so that the HLB value of a side chain of the polycarboxylate superplasticizer is reduced, the rigidity of the side chain is enhanced, the adsorption effect of the side chain on water molecules is reduced, and the side chain can be more stretched in a cement pore solution, the cladding effect of the side chain on the water molecules is reduced, so that the consumption of water by the polycarboxylate structure is reduced. The polycarboxylate superplasticizer has excellent viscosity-reducing performance in high-strength concrete with low water-binder ratio; and the preparation method of the viscosityreduction type polycarboxylate superplasticizer is simple, rapid and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, and in particular relates to a viscosity-reducing polycarboxylate water reducer and a preparation method thereof. Background technique [0002] At present, concrete technology is gradually moving towards high-strength and ultra-high-strength, which makes the viscosity of concrete gradually increase, resulting in doubled pumping resistance and increased construction difficulty. Therefore, it is particularly urgent to prepare a polycarboxylate water-reducer that can satisfy the water-reducing and slump-retaining properties of high-strength concrete and reduce the viscosity of high-strength concrete to a certain extent. [0003] At present, scholars at home and abroad have different opinions on the viscosity reduction technology of polycarboxylate superplasticizers, but the interaction mechanism between polycarboxylate superplasticizers and cement-based materials has been unified. After the cemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F216/14C08F220/06C08F230/02C08F220/38C08F228/02C08F220/18C08F4/40C04B24/16C04B103/30
CPCC08F216/14C08F4/40C04B24/165C04B2103/302C08F216/1416C08F220/06C08F230/02C08F220/382C08F222/06C08F228/02C08F220/1811
Inventor 代柱端陈健董耀武周晓阳
Owner 武汉优城科技有限公司
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