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Method for synthesizing polycarboxylic acid series cement water reducer accelerated by microwave

A technology for synthesizing polycarboxylic acid and water reducing agent, which is applied in the field of synthesizing polycarboxylic acid cement water reducing agent, can solve problems such as unstable copolymer performance, and achieve the effects of reducing energy consumption, reducing pollution, and shortening reaction time

Inactive Publication Date: 2008-05-28
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the copolymerization reaction, there are problems such as unstable performance of the copolymer caused by difficult control of process conditions

Method used

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  • Method for synthesizing polycarboxylic acid series cement water reducer accelerated by microwave
  • Method for synthesizing polycarboxylic acid series cement water reducer accelerated by microwave

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Microwave-promoted synthesis of polycarboxylate water reducer

[0019] With comparative example conditions, add polyethylene glycol (20) monomethyl ether methacrylate 55.6g (0.05mol), methyl acrylate 12.9g (0.15mol), sodium methacrylate sulfonate in the reactor with stirring 15.9g (0.1mol), methacrylic acid 60.2g (0.7mol) and 145g water, stir well. A solution of ammonium persulfate (0.87 g in 10 g of water) was then added thereto with stirring. The reactor was placed in a microwave reactor, and the above-mentioned reaction mixture was irradiated with 1000w microwave to rapidly raise the temperature to 90°C. Then set the microwave power to 1000w and the reaction temperature to 90°C, and react under stirring for 5 minutes to obtain a colorless, transparent and uniform solution. The existence of double bonds cannot be detected by iodometric method. Continue aging for 1 to 2 minutes under the same microwave radiation reaction conditions. The aqueous sodium hydr...

Embodiment 2

[0021] Embodiment 2: Microwave promotes the synthesis of polycarboxylate water reducer

[0022] Add polyethylene glycol (23) monomethyl ether methacrylate 111.2g (0.1mol), methyl acrylate 8.6g (0.1mol), sodium methacrylate sulfonate 23.9g (0.15mol) in the stirred reactor ), methacrylic acid 55.9g (0.65mol) and 200g water, stir well. A solution of ammonium persulfate (1.4 g in 10 g of water) was then added thereto with stirring. The reactor was placed in a microwave reactor, and the above-mentioned reaction mixture was irradiated with 1000w microwave to rapidly raise the temperature to 80°C. Then set the microwave power to 800w and the reaction temperature to 80°C, and react under stirring for 6 minutes to obtain a colorless, transparent and uniform solution. The presence of double bonds cannot be detected by the iodometric method. The aqueous sodium hydroxide solution is adjusted to pH=7~8 to obtain the product.

[0023] Referring to the method for determining the solid con...

Embodiment 3

[0024] Embodiment 3: Microwave promotes the synthesis of polycarboxylate water reducer

[0025] In the stirred reactor, add polyethylene glycol (18) monomethyl ether methacrylate 167g (0.15mol), methyl acrylate 17g (0.2mol), sodium methacrylate sulfonate 8g (0.05mol), methyl Acrylic acid 52g (0.6mol) and 250g water, stir well. A solution of ammonium persulfate (2.2 g in 10 g of water) was then added thereto with stirring. The reactor was placed in a microwave reactor, and the above-mentioned reaction mixture was irradiated with 1000w microwave to rapidly raise the temperature to 70°C. Then set the microwave power to 600w and the reaction temperature to 70°C, and react under stirring for 7 minutes to obtain a colorless, transparent and uniform solution. The presence of double bonds cannot be detected by the iodometric method. Continue aging for 1 to 2 minutes under the same microwave radiation reaction conditions. The aqueous sodium hydroxide solution is adjusted to pH=7~8 to...

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Abstract

The invention relates to a method for using microwave to accelerate the synthesis of polycarboxylic acid cement water reducerm belonging to organic synthesis technical field. The invention based n the property demand of cement water reducer and analysis on monomer molecule structure-activity relationship optimizes selection of monomer molecule structure and monomer proportioning. The invention uses methacrylic acid, methyl acrylate, carbowax methyl methyl methacrylate, and methacrylic mahogany as polymerization monomers, uses ammonium persulfate as initiator, uses microwave technique, uses microwave to rapidly synthesize polycarboxylic acid water reducer. The inventive method can significantly reduce reaction time, reduce energy consumption, reduce pollution, and improve product purified pulp flowing ability, as one safe, effective, energy-saving, environment-friend and simple method.

Description

technical field [0001] The invention discloses a method for synthesizing a polycarboxylate cement water reducer by using microwaves, which belongs to the technical field of organic synthesis. Specifically, it is a mixture of amine persulfate as the initiator, polyethylene glycol monomethyl ether methacrylate, methyl acrylate, sodium methacrylate, methacrylic acid and other four monomers as the reactant , A method of synthesizing a polycarboxylate cement superplasticizer under microwave radiation. Background technique [0002] Polycarboxylate cement superplasticizer is currently the most promising new generation of concrete superplasticizer. Because of its high water reduction, low dosage and high slump performance, it has gradually been widely recognized by the concrete industry. Compared with the first-generation and second-generation water-reducers, polycarboxylate cement water-reducers have the following advantages: (1) It has super-dispersion properties for cement molec...

Claims

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Application Information

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IPC IPC(8): C08F220/10C04B24/26C04B103/30
Inventor 夏咏梅方云徐兆付
Owner JIANGNAN UNIV
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