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Polycarboxylic acid base water reducer preparation method

A technology of polycarboxylate and water reducer, which is applied in the field of preparation of polycarboxylate water reducer, can solve the problems of large environmental pollution, long production cycle, low strength, etc., achieve easy control of reaction conditions, improve strength and Excellent durability and fluidity

Inactive Publication Date: 2014-05-07
NANJING HENGAN RESIN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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
And existing production method is big to environmental pollution, and production cycle is long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A preparation method of a polycarboxylate water reducer, the method comprising the steps of:

[0019] 1) First, put 10 parts of carboxyl group-containing dibasic acid monomer, 40 parts of hydroxyethyl acrylate, and 100 parts of melamine into the reaction kettle, stir and heat up, and react at 90-100°C for 2 hours to obtain a transparent liquid for later use;

[0020] 2) Then put 50 parts of PEG, 1 part of p-toluenesulfonic acid, 5 parts of sodium bisulfate, and 100 parts of water into another reaction kettle, heat up to 60-70°C, then add 20 parts of initiator, raise the temperature, and control When the temperature is 80-90°C, the transparent liquid is added dropwise at a rate of 10ml / min, and the reaction is continued for 2 hours after the dropwise addition is completed to obtain the polycarboxylic acid-based water reducer.

[0021] Wherein, the carboxyl-containing dibasic acid monomer is adipic acid. The initiator is ammonium persulfate. Wherein, the molecular weigh...

Embodiment 2

[0023] A preparation method of a polycarboxylate water reducer, the method comprising the steps of:

[0024] 1) First, put 30 parts of carboxyl-containing dibasic acid monomers, 60 parts of hydroxyethyl acrylate, and 120 parts of melamine into the reaction kettle, stir and heat up, and react at 100-110°C for 4 hours to obtain a transparent liquid for later use;

[0025] 2) Then put 80 parts of PEG, 3 parts of p-toluenesulfonic acid, 8 parts of sodium bisulfate, and 130 parts of water into another reaction kettle, heat up to 60-70°C, then add 50 parts of initiator, raise the temperature, and control When the temperature is 80-90°C, the transparent liquid is added dropwise at a rate of 10ml / min, and the reaction is continued for 3 hours after the dropwise addition is completed to obtain the polycarboxylic acid-based water reducer.

[0026] Wherein, the carboxyl-containing dibasic acid monomer is maleic acid. The initiator is potassium persulfate. Wherein, the molecular weight ...

Embodiment 3

[0028] A preparation method of a polycarboxylate water reducer, the method comprising the steps of:

[0029] 1) First, put 20 parts of carboxyl-containing dibasic acid monomers, 50 parts of hydroxyethyl acrylate, and 110 parts of melamine into the reaction kettle, stir and heat up, and react at 110-120°C for 3 hours to obtain a transparent liquid for later use;

[0030] 2) Then put 65 parts of PEG, 2 parts of p-toluenesulfonic acid, 6 parts of sodium bisulfate, and 120 parts of water into another reaction kettle, heat up to 60-70°C, then add 35 parts of initiator, raise the temperature, and control When the temperature is 80-90°C, the transparent liquid is added dropwise at a rate of 10ml / min, and the reaction is continued for 3 hours after the dropwise addition is completed to obtain the polycarboxylic acid-based water reducer.

[0031] Wherein, the carboxyl-containing dibasic acid monomer is succinic acid, and the initiator is ammonium persulfate. The molecular weight of th...

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Abstract

The present invention discloses a polycarboxylic acid base water reducer preparation method, which comprises: adding 10-30 parts of a carboxy-containing dicarboxylic acid monomer, 40-60 parts of hydroxyethyl acrylate and 100-120 parts of melamine to a reaction kettle, carrying out stirring heating, carrying out a reaction for 2-4 h at a temperature of 90-120 DEG C to obtain a transparent liquid so as to be spare; and pouring 50-80 parts of PEG, 1-3 parts of p-toluene sulfonic acid, 5-8 parts of sodium hydrogen sulfate and 100-130 parts of water to another reaction kettle, heating to achieve a temperature of 60-70 DEG C, adding 20-50 parts of an initiator, heating, adding the transparent liquid in a dropwise manner when the temperature is controlled to 80-90 DEG C, and continuously carrying out the reaction for 2-3 h after completing the transparent liquid addition to obtain the polycarboxylic acid base water reducer. According to the present invention, the process is simple, the reaction conditions are easy to control, and no pollution is generated during the production process; and the product prepared by using the preparation method has characteristics of excellent performance, easy use and environmental protection.

Description

[0001] technical field [0002] The invention relates to a preparation method of 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. And the existing production method is big to environmental pollution, and the production period is long. Contents of the invention [0005] Purpose of the invention: In order to ...

Claims

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Application Information

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IPC IPC(8): C04B24/16C08F283/06C08F220/28C08F222/02C04B103/30
Inventor 马步强
Owner NANJING HENGAN RESIN CHEM
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