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

A technology of polycarboxylate and water reducing agent, which is applied in the field of concrete water reducing agent, which can solve the problems of difficult performance, restriction of commercial concrete transportation radius, high water reducing rate of water reducing agent and high slump

Active Publication Date: 2013-08-21
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-necked flask equipped with a stirrer, thermometer, condenser and water separator, and heat to 70°C under stirring; divide 35 parts of MAD into 3~4 times, adding slowly at 10 min intervals . After the feeding is completed, the temperature is raised to 110°C, the temperature is kept for 6 hours, and 20 parts of water are added to make a solution with a mass fraction of 70% to obtain a light yellow transparent liquid. Add 305 parts of TPEG and the prepared star monomer into a four-necked flask, add 460 parts of water and stir and heat to 90°C, 26 parts of AA and 5.8 parts of MAS, and 45 parts of water to make dripping solution A, 2.8 parts of APS and 1.5 parts MPA was mixed with 60 parts of water to make dripping liquid B, and the two dripping liquids A and B were slowly added dropwise respectively. After 3 hours of dripping, the temperature was lowered to below 40 ℃ after the incubation reaction for 2 hours, and 22 parts of liquid caustic...

Embodiment 2

[0014] Add 18.3 parts of GL to a dry four-necked flask equipped with a stirrer, thermometer, condenser and water separator, and heat to 70°C under stirring; divide 44 parts of MAD into 3~4 times, slowly adding 10 minutes each time . After the feeding is completed, the temperature is raised to 110°C, the temperature is kept for 6 hours, and 27 parts of water are added to make a 70% solution to obtain a light yellow transparent liquid. Add 290 parts of TPEG and the prepared star monomer into a four-necked flask, add 450 parts of water and stir and heat to 90°C, 28.5 parts of AA and 6.6 parts of MAS, and 45 parts of water to make dripping solution A, 3.1 parts of APS and 1.7 parts Add 60 parts of MPA with water to make dripping solution B, slowly add dropwise A and B respectively, dripping after 3h, keep the temperature for 2h, then cool to below 40℃, add 26 parts of liquid caustic soda to adjust the pH to 6~7, The finished product ZT-B is obtained after discharging.

Embodiment 3

[0016] Add 15.5 parts of GL to a dry four-necked flask equipped with a stirrer, thermometer, condenser and water separator, and heat to 70°C under stirring; divide 47 parts of MAD into 3 to 4 times, adding slowly at 10 min intervals . After the feeding is completed, the temperature is raised to 110°C, the temperature is kept for 6 hours, and 27 parts of water are added to make a solution with a mass fraction of 70% to 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 and stir and heat to 90°C, 25 parts of AA and 4.6 parts of MAS, and 45 parts of water to make dripping solution A, 2.6 parts of APS and 1.3 parts Add 60 parts of MPA with water to make dripping liquid B, slowly add dropwise A and B respectively, dripping after 3h, keep the temperature for 2h and then cool to below 40℃, add 18 parts of liquid caustic soda to adjust the pH to 6~7, The finished product ZT-C is obtaine...

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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 present invention belongs to the field of concrete water reducing agent in building materials. It specifically involves a high -performance water reducing agent of a starcar carboxylic acid system, which specializes in the preparation method of this kind of water reduction agent. Background technique [0002] With the rise of large -scale infrastructure such as nuclear power, water conservancy, bridges, and tunnels in my country, especially the planning and implementation of the national railway passenger dedicated network project, the market demand for polycarboxylic acid reduction agents has continued to grow.Compared with the traditional high -efficiency water reducing agent, the polycar carboxylic acid reducing agent has become a key material for concrete high -performance with its high water reduction rate, low collapse loss, and low alkali content.In addition, with the development of commodity concrete, the landscape of polycarboxylic acid reducti...

Claims

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Application Information

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Patent Type & Authority Patents(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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