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Air entraining type poly carboxylic acid high performance water reducing agent and preparation method thereof

A polycarboxylate-based, high-performance technology, applied in the field of concrete water reducing agent and its preparation, can solve the problems of unevenness, poor air-entraining performance, large bubble size, etc., and achieve high water-reducing rate, excellent air-entraining performance, The effect of improving durability

Active Publication Date: 2013-03-06
LEPING LINGHANG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The main purpose of the present invention is to provide an air-entraining polycarboxylate-based high-performance water reducer and its preparation method to overcome the poor air-entraining performance of existing polycarboxylate-based water reducers, the large size of air bubbles introduced into concrete, uneven defect

Method used

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  • Air entraining type poly carboxylic acid high performance water reducing agent and preparation method thereof
  • Air entraining type poly carboxylic acid high performance water reducing agent and preparation method thereof
  • Air entraining type poly carboxylic acid high performance water reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 0.25mol of monomer A is methyl alkenyl polyoxyethylene with a degree of polymerization of 30-60;

[0037] 0.70mol monomer B is methacrylic acid;

[0038] 0.18mol monomer C is acrylamide;

[0039] 0.05mol monomer D is ethyl acetate;

[0040] Initiator is sodium persulfate;

[0041] The chain transfer agent is a mixture of mercaptoacetic acid and sodium bisulfite in a ratio of 1:2;

[0042] Preparation steps:

[0043] a. Monomer B, monomer C and monomer D equivalent to twice the molar weight of monomer C are dissolved in deionized water, and stirred evenly to obtain a small monomer solution, which is stirred evenly and set aside;

[0044] B, the chain transfer agent is dissolved in deionized water, stirred evenly, and the chain transfer agent solution is obtained for use, and the consumption of the chain transfer agent is 0.1% by weight of the total monomer weight of the reaction;

[0045]c. Put monomer A and deionized water into the reaction container and heat to di...

Embodiment 2

[0048] 0.25mol of monomer A is allyl polyoxyethylene ether with a degree of polymerization of 30-60;

[0049] 0.70mol monomer B is methacrylic acid;

[0050] 0.18mol monomer C is 2-acrylamido-methylpropanesulfonic acid;

[0051] 0.05mol monomer D is ethyl acetate;

[0052] The initiator is a mixture of ammonium persulfate and sodium persulfate in a ratio of 1:1;

[0053] The chain transfer agent is mercaptoacetic acid;

[0054] Preparation steps:

[0055] a. Monomer B, monomer C and monomer D equivalent to twice the molar weight of monomer C are dissolved in deionized water, and stirred evenly to obtain a small monomer solution, which is stirred evenly and set aside;

[0056] B, the chain transfer agent is dissolved in deionized water, stirred evenly, and the chain transfer agent solution is obtained for use, and the consumption of the chain transfer agent is 0.2% by weight of the total monomer weight of the reaction;

[0057] c. Put monomer A and deionized water into the...

Embodiment 3

[0060] 0.25mol of monomer A is polyoxypropylene ether with a degree of polymerization of 30-60;

[0061] 0.70mol monomer B is acrylic acid;

[0062] 0.18mol monomer C is sodium methacrylate;

[0063] 0.05mol monomer D is styrene;

[0064] The initiator is hydrogen peroxide;

[0065] The chain transfer agent is a mixture of mercaptoacetic acid and 2-mercaptopropionic acid in a ratio of 2:1;

[0066] Preparation steps:

[0067] a. Monomer B, monomer C and monomer D equivalent to twice the molar weight of monomer C are dissolved in deionized water, and stirred evenly to obtain a small monomer solution, which is stirred evenly and set aside;

[0068] B, the chain transfer agent is dissolved in deionized water, stirred evenly, and the chain transfer agent solution is obtained for use, and the consumption of the chain transfer agent is 0.25% by weight of the total monomer weight of the reaction;

[0069] c. Put the monomer A and deionized water into the reaction container and h...

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Abstract

The present invention relates to an air entraining type poly carboxylic acid high performance water reducing agent and a preparation method thereof. According to the water reducing agent, 0.25 mol of a monomer methyl alkenyl polyoxyethelene, allyl polyoxyethelene ether or polyoxypropylene ether with a polymerization degree of 30-60, 0.70 mol of a monomer methacrylic acid or acrylic acid, 0.18 mol of a monomer sodium methylallyl sulfonate, acrylamide or 2-acrylamide-methyl propanesulfonic acid, 0.05 mol of a monomer styrene or ethyl acetate, an initiator agent and a chain transfer agent are subjected to a thermal insulation reaction for 4-5 h at a temperature of 48-52 DEG C by adopting deionized water as a reaction medium to carry out copolymerization to obtain a polymer with a molecular weight of 60000-80000, cooling is performed to a temperature of less than 40 DEG C, and a 40% sodium hydroxide solution is added to adjust the pH value to 6-8 to obtain the finished product. The air entraining type poly carboxylic acid high performance water reducing agent has a high water reducing rate, wherein the water reducing rate can be 30% when the water reduced solid doping amount is 0.2%, and the air entraining of concrete can be 5-7% when the water reduced solid doping amount is 0.2% under the premise of no other air entraining agent compounding.

Description

technical field [0001] The invention relates to a concrete water reducer and a preparation method thereof, in particular to an air-entraining type polycarboxylate high-performance water reducer and a preparation method thereof. Background technique [0002] Water reducing agent refers to an admixture that can keep the workability of cement paste, mortar and concrete unchanged and significantly reduce its mixing water consumption. It can significantly increase the strength of concrete, improve the frost resistance and impermeability of concrete, and reduce the amount of cement used. [0003] According to the water reducing and strengthening ability of the water reducing agent, it is divided into ordinary water reducing agent (also known as plasticizer, water reducing rate is not less than 8%), high-efficiency water reducing agent (also known as superplasticizer, water reducing rate is not less than 14%) %) and high performance water reducing agent (water reducing rate not le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C04B24/26C08F290/06C08F283/06C08F220/06C08F228/02C08F220/56C08F220/58C08F212/08C08F2/38C04B103/30
Inventor 黄建国董渊李志坤
Owner LEPING LINGHANG NEW MATERIAL CO LTD
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