Method for preparing slow-release polycarboxylic acid water reducing agent by using molecular assembly technology

A slow-release polycarboxylic acid and assembly technology technology, which is applied in the field of molecular assembly technology for the preparation of slow-release polycarboxylate water-reducing agents, can solve the problems of unseen industrialized production and application, poor selectivity and repeatability, and the like. Good repeatability, easy operation and simple effect

Inactive Publication Date: 2011-05-04
孔健民 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The researcher of the present invention thinks that this method selectivity and repeatability are poor
A

Method used

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  • Method for preparing slow-release polycarboxylic acid water reducing agent by using molecular assembly technology
  • Method for preparing slow-release polycarboxylic acid water reducing agent by using molecular assembly technology
  • Method for preparing slow-release polycarboxylic acid water reducing agent by using molecular assembly technology

Examples

Experimental program
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Effect test

Embodiment 1

[0025] 1068 parts of methoxypolyethylene glycol MPEG1000 methacrylate (macromonomer), 258 parts of methacrylic acid, 10 parts of thioglycolic acid and 1500 parts of water are made into monomer aqueous solution, and 10 parts of ammonium persulfate are dissolved in 90 10% aqueous initiator solution was prepared with water. Add 550 parts of water into the reaction kettle, heat to 80°C, and add the above monomer aqueous solution and initiator aqueous solution dropwise at the same time. During the dropwise addition, the temperature was maintained, and the dropwise addition was completed in 4 hours. The reaction was continued for 30 minutes to obtain the assembly precursor.

[0026] Lower the temperature of the above-mentioned assembly precursor to 60°C, add 10 parts of the assembly agent tetramethylethylenediamine, stir and react for 6 hours, neutralize with 120 parts of 40% aqueous sodium hydroxide solution, lower the temperature, and obtain a slow-release polycarboxylic acid wat...

Embodiment 2

[0028] 1000 parts of polyethylene glycol allyl ether XPEG1000 (macromonomer), 392 parts of methacrylic acid, 10 parts of thioglycolic acid and 1800 parts of water are made into monomer aqueous solution, and 10 parts of ammonium persulfate are dissolved in 90 parts of water to prepare into a 10% aqueous initiator solution. Add 550 parts of water into the reaction kettle, heat to 80°C, and add the above monomer aqueous solution and initiator aqueous solution dropwise at the same time. During the dropwise addition, the temperature was maintained, and the dropwise addition was completed in 4 hours. The reaction was continued for 30 minutes to obtain the assembly precursor.

[0029] Lower the temperature of the above-mentioned assembly precursor to 60°C, add 10 parts of the assembly agent tetramethylethylenediamine, stir and react for 6 hours, neutralize with 120 parts of 40% aqueous sodium hydroxide solution, lower the temperature, and obtain a slow-release polycarboxylic acid wa...

Embodiment 3

[0031] 1068 parts of methoxypolyethylene glycol MPEG1000 methacrylate (macromonomer), 258 parts of acrylic acid, 5 parts of thioglycolic acid and 1500 parts of water are made into monomer aqueous solution, and 10 parts of ammonium persulfate are dissolved in 90 parts of water Dubbed 10% initiator aqueous solution. Add 550 parts of water into the reaction kettle, heat it to 70°C, and add the above monomer aqueous solution and initiator aqueous solution dropwise at the same time. During the dropwise addition, the temperature was maintained, and the dropwise addition was completed in 4 hours. The reaction was continued for 30 minutes to obtain the assembly precursor.

[0032] Cool the above assembly precursor to 60°C, add 15 parts of assembling agent tetraethylhexamethylenediamine, stir and react for 30 minutes, neutralize with 120 parts of 40% aqueous sodium hydroxide solution, lower the temperature, and obtain slow-release polycarboxylic acid water-reduced agent.

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Abstract

The invention provides a method for preparing a slow-release polycarboxylic acid water reducing agent by using a molecular assembly technology. The method comprises the following two steps: 1. carrying out polymerization: preparing raw materials into a water solution, dropwisely adding the solution into water at 50-100 DEG C, and reacting at constant temperature to obtain an assembly precursor, wherein the fuel is prepared from 80-130 parts of macromonomer A, 10-40 parts of micromonomer B, 0.5-3.5 parts of thioglycollic acid and 0.5-3.5 parts of ammonium persulfate; and 2. adding 0.5-5 parts of assembly agent to the assembly precursor at 50-70 DEG C, and adding 5-25 parts of 40% sodium hydroxide while stirring, thereby obtaining the slow-release polycarboxylic acid water reducing agent. The macromonomer A is polyethylene glycol allyl ether (XPEG) or methoxypolyethylene glycol (MPEG); the micromonomer B is one of esters and amides of acrylic acid, methacrylic acid, acrylic acid and methacrylic acid; and the assembly agent is selected from one of ethylene diamine, propylene diamine and the like as well as alkyl derivatives thereof. The slow-release polycarboxylic acid water reducing agent has excellent adaptability for the fluctuations of the raw material quality of concrete.

Description

technical field [0001] The invention relates to a method for preparing a slow-release polycarboxylate water reducer by molecular assembly technology, and belongs to the technical field of concrete admixtures. technical background [0002] Water reducer is a very important concrete admixture, known as the fifth component of concrete. So far, water reducers can be divided into three generations. The first generation water reducer is mainly lignosulfonate; the second generation water reducer is mainly naphthalenesulfonate formaldehyde condensate. With the development of society and the progress of the times, the requirements for buildings are developing in the direction of high quality and high durability, and the requirements for modern concrete technology are getting higher and higher. High-performance concrete with high strength, good working performance and excellent durability is the development direction of concrete. However, the first-generation and second-generation w...

Claims

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Application Information

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IPC IPC(8): C08J3/24C08L51/08C08F283/06C08K5/17C04B24/24C04B103/30
Inventor 王建华
Owner 孔健民
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