Method for rapidly preparing high-water reduction polycarboxylate water reducing agent at low temperature

A water-reducing polycarboxylic acid technology, applied in the field of chemical building materials, can solve the problems of cumbersome operation steps, uncertain performance of water-reducing agents, long production cycle, etc., and achieve good slurry encapsulation, easy control of the reaction process, and high efficiency. Improved effect

Inactive Publication Date: 2016-06-01
中建西部建设新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method reduces the production temperature, but there are still disadvantages such as long production cycle and cumbersome operation steps. In addition, it is still uncertain whether the performance of the water reducing agent is stable.

Method used

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  • Method for rapidly preparing high-water reduction polycarboxylate water reducing agent at low temperature

Examples

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Comparison scheme
Effect test

Embodiment 1

[0029] A method for rapidly preparing a high-water-reducing polycarboxylate water-reducer at low temperature, specifically comprising the following steps:

[0030] 1) Add 382.2g of solid flaky methallyl polyoxyethylene ether (molecular weight 2400), 7.8g of maleic anhydride and 390.0g of deionized water into a 1L four-necked flask and stir evenly. After the monomers are completely dissolved, add Molecular weight regulator thioglycolic acid 3.0g was stirred evenly;

[0031] 2) Add 14 g of 30% NaOH solution dropwise to the solution obtained in step 1) to adjust the pH to 4 to 5, then add 6.5 g of Fenton's reagent (4.0 g of ferrous nitrate aqueous solution with a mass fraction of 1%, and 2.5 g of hydrogen peroxide with a mass fraction of 30%) g composition), after stirring evenly, at 25°C, add dropwise the A solution made of 43.8g acrylic acid and 131.0g deionized water, and the B solution made of 26.0g20% NaOH, wherein the A solution was added dropwise in 0.5h , drop solution B...

Embodiment 2

[0034] A method for rapidly preparing a high-water-reducing polycarboxylate water-reducer at low temperature, specifically comprising the following steps:

[0035] 1) Add 380.0g of solid flake prenol polyoxyethylene ether (molecular weight 2400), 10.3g of itaconic acid and 319.0g of deionized water into a 1L four-neck flask and stir evenly. After the monomers are completely dissolved, add molecular weight Regulator mercaptopropionic acid 1.5g, stir well;

[0036] 2) Add 15 g of 30% NaOH solution dropwise to the solution obtained in step 1), adjust the pH to 5-6, then add Fenton's reagent (3.9 g of ferrous oxalate with 1% mass fraction, 1% mass fraction of sulfurous acid heptahydrate Iron 7.4g, mass fraction 30% hydrogen peroxide 3.0g composition), after stirring evenly, at 20 ℃, drop respectively the A solution that is made of 22.0g acrylic acid and 99.0g deionized water, and 25.0g20% ammonia water B solution, in which the A solution was added dropwise in 40 minutes, and the ...

Embodiment 3

[0039] A method for rapidly preparing a high-water-reducing polycarboxylate water-reducer at low temperature, specifically comprising the following steps:

[0040] 1) Add 380.0g of solid flaky 4-hydroxybutyl vinyl polyoxyethylene ether (molecular weight 2400), 9.2g of maleic acid and 254.8g of deionized water into a 1L four-necked flask and stir evenly until all the monomers are dissolved , add molecular weight regulator mercaptoethanol 1.3g and stir evenly;

[0041]2) Add 12 g of 30% NaOH solution dropwise to the solution obtained in step 1), adjust the pH to 4 to 5, then add Fenton’s reagent (13.6 g of ammonium ferrous sulfate with a mass fraction of 1%, 3.5 g of hydrogen peroxide with a mass fraction of 27%) Composition), after stirring evenly, at 10°C, A solution made of 48.0g acrylic acid and 130.0g deionized water, and B solution made of 20.0g30% KOH were added dropwise, wherein the A solution was added dropwise in 50 minutes, and the B solution was added dropwise. Drop...

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Abstract

The invention provides a method for rapidly preparing a high-water reduction polycarboxylate water reducing agent at a low temperature. The method is characterized in that a Fenton reagent is used as an initiator, a reaction system is controlled under a weakly acidic condition, and an initiation accelerator is added to initiate polymerization reaction of reactive monomers in the reaction system so as to quickly prepare the high-water reduction polycarboxylate water reducing agent. By the method, additional heating is not required, production of the polycarboxylate water reducing agent can be implemented under a low-temperature environment condition, the production cycle is shorter than that adopting the conventional thermal polymerization method, and the method provided by the invention is an environment-friendly and energy-saving new method.

Description

technical field [0001] The invention belongs to the technical field of chemical building materials, and relates to a method for rapidly preparing a high-water-reducing polycarboxylate water-reducer at low temperature. Background technique [0002] Polycarboxylate superplasticizer is the third-generation high-performance superplasticizer widely used in modern concrete. At present, the polycarboxylate superplasticizers sold in the market are generally produced by thermal initiation. Commonly used initiator systems include ammonium persulfate, potassium persulfate, hydrogen peroxide, "hydrogen peroxide-vitamin C", etc., and generally require boiler or electric heating. , The polymerization temperature is 40~60℃, and the production cycle is 4~6h. In addition, long-term cooling is also required. Long production cycle and high energy consumption are one of the important problems facing the green development of polycarboxylate superplasticizers. The development of low-temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/06C08F222/02C04B24/26C04B103/30
CPCC08F283/065C04B24/267C04B2103/302C08F220/06
Inventor 郑广军陈景高育欣刘明李东来傅承飞吕锐王少峰
Owner 中建西部建设新材料科技有限公司
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