Star polycarboxylic-acid high-performance water reducing agent and preparation method thereof

A technology of polycarboxylic acid series and water reducing agent is applied in the preparation of this kind of water reducing agent, in the field of star-shaped polycarboxylic acid series high-performance water reducing agent, which can solve the problem of high slump and restriction of water reducing rate of water reducing agent. The transportation radius of commercial concrete, affecting the effect of water reducing agent, etc.

Active Publication Date: 2012-11-14
NANJING RUIDI HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The loss of concrete slump over time not only directly affects the effect of water reducing agent, but also greatly restricts the transportation radius of commercial concrete, which brings a lot of inconvenience to engineering construction. Therefore, while ensuring a high water reducing rate, it is necessary to further increase the water reducing rate. Slump retention properties of the agent
[0003] At present, domestic research on polycarboxylate superplasticizers is relatively extensive, but it is mainly concentrated on the comb structure, and its performance is difficult to achieve both high water reduction and high slump retention effects
The star-shaped polycarboxylate water-reducer prepared by the present invention has high water-reducing rate and good slump retention performance, and there is no related report in China

Method used

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  • Star polycarboxylic-acid high-performance water reducing agent and preparation method thereof
  • Star polycarboxylic-acid high-performance water reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Add 12.5 parts of GL to a dry four-neck bottle equipped with a stirrer, thermometer, condenser and water separator, and heat up to 70°C under stirring; divide 35 parts of MAD into 3~4 times, and add slowly at intervals of 10 minutes each time . After feeding, raise the temperature to 110°C, keep it warm for 6 hours, add 20 parts of water to make a solution with a mass fraction of 70%, and obtain a light yellow transparent liquid. Add 305 parts of TPEG and the prepared star-shaped monomer into a four-necked bottle, add 460 parts of water, stir and raise the temperature to 90°C, add 26 parts of AA and 5.8 parts of MAS to 45 parts of water to make drop solution A, 2.8 parts of APS and 1.5 parts Add 60 parts of water to MPA to form the dripping liquid B, slowly add the two kinds of dripping liquids A and B respectively, and finish the dripping for 3 hours. After the heat preservation reaction for 2 hours, the temperature is lowered to below 40°C, and 22 parts of liquid alka...

Embodiment 2

[0014] Add 18.3 parts of GL to a dry four-necked bottle equipped with a stirrer, thermometer, condenser and water separator, and heat up to 70°C under stirring; divide 44 parts of MAD into 3~4 times, and slowly add each time at intervals of 10 minutes . After feeding, raise the temperature to 110°C, keep it warm for 6 hours, add 27 parts of water to make a solution with a mass fraction of 70%, and obtain a light yellow transparent liquid. Add 290 parts of TPEG and the prepared star-shaped monomer into a four-necked bottle, add 450 parts of water, stir and raise the temperature to 90°C, add 28.5 parts of AA and 6.6 parts of MAS to 45 parts of water to make drop solution A, 3.1 parts of APS and 1.7 parts Add 60 parts of water to MPA to prepare the dripping liquid B, slowly add the two kinds of dripping liquids A and B respectively, and finish the dripping for 3 hours. After the heat preservation reaction for 2 hours, the temperature is lowered to below 40°C, and 26 parts of liqu...

Embodiment 3

[0016] Add 15.5 parts of GL to a dry four-neck bottle equipped with a stirrer, thermometer, condenser and water separator, and heat up to 70°C under stirring; divide 47 parts of MAD into 3~4 times, slowly add each time at intervals of 10 minutes . After feeding, raise the temperature to 110°C, keep it warm for 6 hours, add 27 parts of water to make a solution with a mass fraction of 70%, and obtain a light yellow transparent liquid. Add 280 parts of TPEG and the prepared star-shaped monomer into a four-necked bottle, add 428 parts of water, stir and raise the temperature to 90°C, add 25 parts of AA and 4.6 parts of MAS to 45 parts of water to make drop solution A, 2.6 parts of APS and 1.3 parts Add 60 parts of water to MPA to make the dripping liquid B, slowly add the two kinds of dripping liquids A and B respectively, and finish the dripping for 3 hours. After the heat preservation reaction for 2 hours, the temperature is lowered to below 40°C, and 18 parts of liquid alkali i...

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Abstract

The invention relates to a star polycarboxylic-acid high-performance water reducing agent which is prepared by the following steps: reacting 3.2-5% of maleic anhydride and 1.2-2% of glycerol to generate a star monomer, and polymerizing the start monomer with 26-32% of methylallylpolyether, 2.4-3% of acrylic acid, 0.4-0.8% of sodium methylallyl sulfonate and other monomers in a water solution under the actions of ammonium persulfate and mercaptopropionic acid. Compared with the prior art, the star polycarboxylic-acid high-performance water reducing agent provided by the invention overcomes thedefects of high doping amount, high slump loss, poor cement adaptability and the like in the existing water reducing agent. Besides, the invention does not use any organic solvent, is simple to operate, can easily control the reaction process, and is green and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of concrete water reducers in building materials, in particular to a star-shaped polycarboxylate high-performance water reducer, and in particular to a preparation method of the water reducer. Background technique [0002] With the rise of my country's nuclear power, water conservancy, bridges, tunnels and other large-scale infrastructure, especially the planning and implementation of the national railway passenger dedicated network project, the market demand for polycarboxylate water reducers continues to grow. Compared with traditional high-efficiency water reducers, polycarboxylate water reducers have become the key materials for high-performance concrete due to their excellent properties such as high water reducing rate, low slump loss, and low alkali content. In addition, with the development of commercial concrete, the requirements for the slump retention performance of polycarboxylate superplasticizer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C08F283/06C04B103/30
Inventor 陈国新祝烨然黄国泓王冬沈燕平徐唯唯杨日付丹华
Owner NANJING RUIDI HIGH TECH
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