Sustained-release polycarboxylic high-performance water reducing agent and preparation method thereof

A slow-release polycarboxylic acid and high-performance technology, which is applied in the field of concrete water-reducing agent and its preparation, can solve the problem that the concrete slump performance cannot be satisfied, the water-reducing rate of the water-reducing agent is low, and the water-reducing function does not have a slow-release effect and other problems, to achieve the effect of high water reducing rate, excellent slump retention performance and wide adaptability

Active Publication Date: 2013-01-02
广西云鹰新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the water-reducing rate of this water-reducing agent is low (the water-reducing rate is lower than 30% when the reduced solid content is 0.2%), and the water-reducing function does not have a slow-release effect, which cannot meet the high requirements for concrete slump performance. project

Method used

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  • Sustained-release polycarboxylic high-performance water reducing agent and preparation method thereof
  • Sustained-release polycarboxylic high-performance water reducing agent and preparation method thereof
  • Sustained-release polycarboxylic high-performance water reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 0.13mol of monomer A is methylalkenyl polyoxyethylene with a degree of polymerization of 30-60;

[0042] 0.32mol monomer B is acrylic acid;

[0043] 0.01mol monomer C is sodium methacrylate;

[0044] 0.12mol monomer D is acrylamide;

[0045] 0.05mol monomer E is ethyl acetate;

[0046] The initiator is a mixture of sodium sulfate and potassium persulfate in a ratio of 1:1;

[0047] The chain transfer agent is mercaptoacetic acid;

[0048] Preparation steps:

[0049] a. Dissolve monomer C, monomer D, monomer E, and monomer B in an equimolar amount to monomer D in deionized water, stir evenly, and obtain a small monomer solution for use;

[0050] B, the chain transfer agent is dissolved in deionized water, stirred evenly, and the chain transfer agent solution is obtained for use; the consumption of the chain transfer agent is 0.05% by weight of the total monomer weight of the reaction;

[0051] c. Put the monomer A and deionized water into the reaction container and...

Embodiment 2

[0054] 0.13mol of monomer A is allyl polyoxyethylene ether with a degree of polymerization of 30-60;

[0055] 0.32mol monomer B is methacrylic acid;

[0056] 0.01mol monomer C is sodium methacrylate;

[0057] 0.12mol monomer D is 2-acrylamido-methylpropanesulfonic acid;

[0058] 0.05mol monomer E is styrene;

[0059] The initiator is hydrogen peroxide;

[0060] The chain transfer agent is a mixture of mercaptoacetic acid, 2-mercaptopropionic acid and 3-mercaptopropionic acid in a ratio of 1:1:1;

[0061] Preparation steps:

[0062] a. Dissolve monomer C, monomer D, monomer E, and monomer B in an equimolar amount to monomer D in deionized water, stir evenly, and obtain a small monomer solution for use;

[0063] B, the chain transfer agent is dissolved in deionized water, stirred evenly, and the chain transfer agent solution is obtained for use; the consumption of the chain transfer agent is 0.2% by weight of the total monomer weight of the reaction;

[0064] c. Put the mo...

Embodiment 3

[0067] 0.13mol of monomer A is polyoxypropylene ether with a degree of polymerization of 30-60;

[0068] 0.32mol monomer B is acrylic acid;

[0069] 0.01mol monomer C is sodium methacrylate;

[0070] 0.12mol monomer D is acrylamide;

[0071] 0.05mol monomer E is ethyl acetate;

[0072] The initiator is a mixture of sodium sulfate and hydrogen peroxide at 2:1;

[0073] Chain transfer agent is sodium bisulfite;

[0074] Preparation steps:

[0075] a. Dissolve monomer C, monomer D, monomer E, and monomer B in an equimolar amount to monomer D in deionized water, stir evenly, and obtain a small monomer solution for use;

[0076] B, the chain transfer agent is dissolved in deionized water, stirred evenly, and the chain transfer agent solution is obtained for use; the consumption of the chain transfer agent is 0.4% by weight of the total monomer weight of the reaction;

[0077] c. Put the monomer A and deionized water into the reaction container and heat to dissolve. After the ...

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Abstract

The invention relates to a sustained-release polycarboxylic high-performance water reducing agent and a preparation method thereof. The water reducing agent comprises: 0.13mol of monomer methyl alkenyl polyoxyethelene or allyl polyoxyethylene ether or polyoxypropylene ether, 0.32mol of monomer acrylic acid or methacrylic acid, 0.01mol of monomer sodium methallyl sulfonate, 0.12mol of monomer acrylamide or 2-acrylamide-methylpropanesulfonic acid, and 0.05mol of monomer ethyl acetate or styrene. Deionized water is adopted as a reaction medium, and the materials are subjected to a reaction with an initiating agent and a chain transfer agent for 4-6h with a maintained temperature of 58-62 DEG C. Copolymerization is carried out, such that a polymer with a molecular weight of 50000-120000 is obtained; the temperature is reduced to below 40 DEG C, and an alkali solution is added for regulating the pH of the system to 6-8, such that the water reducing agent is obtained. The sustained-release polycarboxylic high-performance water reducing agent provided by the invention has high water reduction rate. When an equivalent solid dosage is 0.2%, a water reduction rate can reach 35%. A slump performance is good. Concrete slump and extension degree have no loss in 3h. The water reducing agent is widely adaptable with concrete raw materials.

Description

technical field [0001] The invention relates to a concrete water reducer and a preparation method thereof, in particular to a slow-release polycarboxylate high-performance water reducer and a preparation method thereof. Background technique [0002] Water reducing agent refers to the admixture that can reduce the mixing water consumption and improve the concrete strength under the condition of constant workability and cement dosage of concrete; or save the dosage of cement under the condition of constant workability and strength. [0003] With the continuous advancement of construction technology, large-span, high-rise, and super high-rise buildings emerge in endlessly. Correspondingly, higher requirements are put forward for the most used building material—concrete, which requires concrete to meet various requirements such as high strength, excellent workability, and high durability. performance. For this reason, the fluidity of concrete is still required to meet the requi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C08F283/06C04B103/30
Inventor 黄建国董渊李志坤
Owner 广西云鹰新材料科技有限公司
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