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Polycarboxylic acid base water reducer

A polycarboxylate-based water-reducing agent technology, applied in the field of polycarboxylate-based water-reducing agents, can solve the problems of high acidity, strong corrosion of steel bars, and poor fluidity of water-reducing agents, and achieve improved strength and durability, transportation Convenience and performance

Inactive Publication Date: 2014-05-07
NANJING HENGAN RESIN CHEM
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0004] However, the water reducing agents currently used have poor fluidity, high gas content, and low strength, and are prone to clogging during pumping; moreover, most of the current water reducing agents are not environmentally friendly, contain formaldehyde that is harmful to the environment and human body, and have high acidity , highly corrosive to steel bars

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0016] Wherein, the carboxyl-containing dibasic acid monomer is adipic acid; the initiator is ammonium persulfate. The molecular weight of the PEG is 500.

[0017] When preparing, firstly put the carboxyl group-containing dibasic acid monomer, hydroxyethyl acrylate, and melamine into the reaction kettle, stir and heat up, and react at 90-120°C for 2-4 hours to obtain a transparent liquid for use; then put PEG , p-toluenesulfonic acid, sodium bisulfate, and water were put into another reaction kettle, heated to 60-70°C, then added 35 parts of initiator, raised the temperature, and added dropwise transparent liquid while keeping the temperature at 80-90°C. After the dropwise addition, the reaction was continued for 2-3 hours to obtain the polycarboxylate water reducer.

[0018] Example 2:

Embodiment 2

[0020] Wherein, the carboxyl-containing dibasic acid monomer is maleic acid, and the initiator is potassium persulfate. The molecular weight of the PEG is 1000.

[0021] Example 3:

Embodiment 3

[0023] Wherein, the carboxyl-containing dibasic acid monomer is succinic acid, and the initiator is ammonium persulfate. The molecular weight of the PEG is 2000.

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PUM

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Abstract

The present invention discloses a polycarboxylic acid base water reducer, which comprises, by weight, 50-80 parts of PEG, 10-30 parts of a carboxy-containing dicarboxylic acid monomer, 40-60 parts of hydroxyethyl acrylate, 100-120 parts of melamine, 1-3 parts of p-toluene sulfonic acid, 5-8 parts of sodium hydrogen sulfate, 20-50 parts of an initiator, and 100-130 parts of water. The polycarboxylic acid base water reducer has characteristics of excellent performance and easy use, can be directly incorporated into concrete while the concrete performance is not affected, can be provided for making cement paste have good fluidity, can not produce clogging during pumping, is convenient during transportation, and further has characteristics of environmental protection, no formaldehyde harmful for environment and human body, low acidity, almost no corrosion on steel bar, and effective concrete strength and durability improvement.

Description

[0001] technical field [0002] The invention relates to a polycarboxylate water reducer. Background technique [0003] Water reducing agent refers to the one that can reduce the mixing water consumption and improve the concrete strength under the condition of constant workability of concrete and the same amount of cement; or save the amount of cement under the condition of constant workability and strength. [0004] However, the water reducing agents currently used have poor fluidity, high gas content, and low strength, and are prone to clogging during pumping; moreover, most of the current water reducing agents are not environmentally friendly, contain formaldehyde that is harmful to the environment and human body, and have high acidity , highly corrosive to steel bars. Contents of the invention [0005] Purpose of the invention: In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a polycarboxylate water reducer wit...

Claims

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Application Information

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IPC IPC(8): C04B24/16C04B103/30
Inventor 马步强
Owner NANJING HENGAN RESIN CHEM
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