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Concrete viscosity adjusting agent and preparation method thereof

A viscosity regulator and concrete technology, which is applied in the field of concrete admixtures, can solve the problems of incompatibility and low concrete strength, and achieve the effects of good compatibility, simple preparation method and wide source of raw materials

Active Publication Date: 2015-04-01
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the vast majority of thickeners, such as: cellulose, Wenlun rubber, sodium alginate, polyvinyl alcohol, polyacryl, EVA rubber powder, sodium polyacrylate, etc., are incompatible with polycarboxylate superplasticizers. At the same time, the air-entraining effect of the above-mentioned thickeners will also lead to low strength of concrete in the later stage

Method used

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  • Concrete viscosity adjusting agent and preparation method thereof
  • Concrete viscosity adjusting agent and preparation method thereof
  • Concrete viscosity adjusting agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A concrete viscosity regulator, the monomer ratio involved is acryloyloxyethyltrimethylammonium chloride, acrylic acid, N,N'-methylenebisacrylamide in a molar ratio of 1:0.5:0.01, which The preparation method comprises the following steps:

[0027] Add 300g of deionized water, 38.6g of acryloyloxyethyltrimethylammonium chloride, 7.2g of acrylic acid , 0.31g of N,N'-methylenebisacrylamide, and stirred at 70°C until all the monomers were dissolved. Nitrogen gas was introduced into the flask to replace the air in the flask. Then 0.46 g of ammonium persulfate was added to the flask, stirring was continued and the internal temperature of the flask was kept at 70°C to start polymerization. React at constant temperature for 4 hours, lower the temperature to 40°C, and then adjust the pH of the solution to about 6 with a 30 wt% aqueous sodium hydroxide solution to obtain a concrete viscosity regulator with a solid content of about 13%.

[0028] The concrete viscosity modifier...

Embodiment 2

[0030] A concrete viscosity regulator, the molar ratio of the monomer acryloyloxyethyltrimethylammonium chloride, acrylic acid, and N,N'-methylenebisacrylamide is 1:1:0.02, and its preparation method includes The following steps:

[0031] Acryloyloxyethyltrimethylammonium chloride, acrylic acid, and N,N'-methylenebisacrylamide were added to a four-necked flask equipped with a dropping device, a stirrer, a condenser, a thermometer, and a nitrogen gas introduction device. 300g of deionized water, 38.6g of acryloyloxyethyltrimethylammonium chloride, 14.4g of acrylic acid, 0.62g of N,N'-methylenebisacrylamide, and stirred at 65°C until all monomers dissolve. Nitrogen gas was introduced into the flask to replace the air in the flask. Then 0.84 g of ammonium persulfate was added to the flask, stirring was continued and the internal temperature of the flask was maintained at 65°C to start polymerization. React at constant temperature for 4 hours, lower the temperature to 40°C, and...

Embodiment 3

[0034] A concrete viscosity regulator, the molar ratio of the monomer acryloyloxyethyltrimethylammonium chloride, acrylic acid, and N,N'-methylenebisacrylamide is 1:1:0.1, and its preparation method includes The following steps:

[0035] In a four-neck flask equipped with a dropping device, a stirrer, a condenser, a thermometer, and a nitrogen introduction device, add 500 g of deionized water, 38.6 g of acryloyloxyethyltrimethylammonium chloride, and 14.4 g of acrylic acid , 3.1 g of N,N'-methylenebisacrylamide, and stirred at 60° C. until all the monomers were dissolved. Nitrogen gas was introduced into the flask to replace the air in the flask. Then 0.51 g of ammonium persulfate was added to the flask, stirring was continued and the internal temperature of the flask was kept at 60°C to start polymerization. React at constant temperature for 5 hours, lower the temperature to 40°C, and then adjust the pH of the solution to about 7 with a 30 wt% aqueous sodium hydroxide solut...

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Abstract

The invention discloses a concrete viscosity adjusting agent and a preparation method thereof. The concrete viscosity adjusting agent is prepared by copolymerizing a cationic monomer, an anion carboxyl monomer and an inner cross-linking agent together with a free radical, wherein the mole ratio of the cationic monomer to the anion carboxyl monomer and the inner cross-linking agent is 1:(0.5-5):(0.01-0.1). As the cationic monomer and the anion carboxyl monomer are adopted to copolymerize to obtain an amphoteric polymer, the concrete viscosity adjusting agent has remarkable antipolyelectrolyte property and is relatively good in viscosity improvement property; due to adoption of the inner cross-linking agent, three-dimensional net-shaped structures are formed among the viscosity adjusting agent and binding material grains, the concrete disintegration bleeding problem is greatly solved, and the peaceability of concrete is improved. The prepared concrete viscosity adjusting agent is good in compatibility with other additives, the strength development of concrete is not affected, and particularly the concrete disintegration bleeding problem can be effectively solved under the condition of low binding materials.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a concrete viscosity modifier and a preparation method thereof. Background technique [0002] With the continuous development of building structure design and super high-rise buildings, building construction also puts forward higher requirements for concrete performance. The continuous complexity of concrete components and the continuous increase in the density of steel bars in building components often require concrete to have a large flow state, but if the mixture is too thin, the concrete is prone to stratification and segregation, which is likely to cause pump blockage and construction site leakage Accidents such as failure of the strength of the solidified body and solidification body to reach the standard will affect the quality and service life of the concrete project. Especially with the continuous deterioration of concrete raw materials, this problem is more prominent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/34C08F220/06C08F222/38C08F222/06C08F226/02C08F4/40C04B24/26C04B103/44
Inventor 王少峰郑广军毕耀傅承飞李兴孙冲熊龙汪金文邢菊香
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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