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Method for preparing polycarboxylic acids series high-efficiency water-reducing agent

A high-efficiency water reducer and polycarboxylic acid-based technology, applied in the field of synthesis of concrete admixtures, can solve cumbersome and complex problems, and achieve the effect of simple equipment, simple operation, and mild reaction conditions

Inactive Publication Date: 2008-08-06
王伟松
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many reports on the synthesis methods of polycarboxylate superplasticizers, but most of them are cumbersome and complicated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Mix 160 parts of polyethylene glycol monomethyl ether (polymerization degree n is 23) acrylate with 30 parts of methacrylic acid, 2.3 parts of mercaptoethanol and 50 parts of deionized water, and add 660 parts of Deionized water, filled with nitrogen, heated up to 90°C-95°C, at the same time, dropwise added a mixed solution of polyethylene glycol monomethyl ether acrylate, methacrylic acid, mercaptopropionic acid and 34 parts of 5% ammonium persulfate solution, dropwise Adding time is 2.5 hours, then add 12 parts of 5% ammonium persulfate solution dropwise, dropwise adding time is 1.0 hour, keep warm for 2.0 hours after dropping, cool down to 55℃~65℃, neutralize with sodium hydroxide solution The pH value is 7.0-8.0, and then the solid content of the solution is adjusted to 20%, which is the polycarboxylate superplasticizer. It is applied to the mortar prepared by a certain brand of cement, and its water reduction rate is measured to be 27.0%. (The amount of...

Embodiment 2

[0018] Example 2: Mix 160 parts of polyethylene glycol monomethyl ether (polymerization degree n is 29) methacrylate with 26 parts of acrylic acid, 2.0 parts of mercaptopropionic acid and 70 parts of deionized water, and add 600 parts of 1 part deionized water, filled with nitrogen, heated to 90 ℃ ~ 95 ℃, and at the same time, dropwise added a mixed solution of polyethylene glycol monomethyl ether methacrylate, acrylic acid, mercaptopropionic acid and 38 parts of 5% sodium persulfate solution, The dropping time is 3.0 hours, and then 10 parts of 5% sodium persulfate solution is added dropwise for 1.5 hours. Mix until the pH value is 7.0-8.0, and then adjust the solid content of the solution to 20%, which is the polycarboxylate superplasticizer. It is applied to the mortar prepared by a certain brand of cement, and its water reduction rate is measured to be 26.0%. (The amount of polycarboxylate high-efficiency water reducer is 1% of the cement mass).

[0019] The nitrogen gas...

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Abstract

The invention relates to a method for preparing high-efficient water reducing agent of polycarboxylic acid type, which belongs to a synthesis technique field of concrete additive. The method takes methacrylate of methoxy polyethylene glycol, methacrylic acid and chain transfer agent as raw materials and is characterized in that the materials are mixed with water to form mixed solution; aqueous solution charged with nitrogen is added with the mixed solution and initiator solution to carry out copolymerization, after which pH value of the solution is adjusted by applying basic compounds to obtain the high-efficient water reducing agent of polycarboxylic acid type; the molar ratio of the methacrylate of methoxy polyethylene glycol and the methacrylic acid is 1.0 : 2.0-8.0; the chain transfer agent belongs to soluble chain transfer agent of mercaptan type, including mercaptoethanol, mercaptoacetic acid, mercaptopropionic acid or etc., with adding amount accounting for 0.01-5.0 percent of total weight percentage of the methacrylate of methoxy polyethylene glycol and the methacrylic acid. The method for preparing high-efficiency water reducing agent of polycarboxylic acid type has the advantages of reasonable technology, simple operation and mild reaction condition.

Description

technical field [0001] The invention relates to a preparation method of a polycarboxylic acid-based high-efficiency water reducer, belonging to the technical field of synthesis of concrete admixtures. Background technique [0002] Polycarboxylate high-efficiency water reducer is the third generation of high-performance water reducer developed after the ordinary water reducer represented by wood calcium and the high-efficiency water reducer represented by naphthalene. This kind of water reducing agent has the advantages of low dosage, high water reducing rate, no segregation, no bleeding, good performance of concrete slump retention, good compatibility with cement, admixtures and other additives, and can prepare ultra-high strength and Ultra-durable concrete can effectively reduce the early adiabatic temperature rise of concrete, reduce the temperature cracks of large-volume concrete, have a large degree of freedom in molecular structure design, and have greater potential for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C04B103/30
Inventor 王伟松王新荣孟照平王胜利朱红军
Owner 王伟松
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