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Method for preparing efficient polycarboxylate graft copolymer super plasticizer through microwave-assisting method

A graft copolymer and microwave-assisted technology is applied in the field of preparing polycarboxylate graft copolymer high-efficiency superplasticizers, which can solve the problems of poor dispersion retention ability and wide molecular weight distribution, and achieve excellent slump retention and slow release. performance, low dispersion index, superior performance

Active Publication Date: 2014-01-08
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The copolymer synthesized by this method effectively improves the problems of wide molecular weight distribution and poor dispersion and retention ability commonly found in superplasticizers synthesized by traditional heating methods

Method used

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  • Method for preparing efficient polycarboxylate graft copolymer super plasticizer through microwave-assisting method
  • Method for preparing efficient polycarboxylate graft copolymer super plasticizer through microwave-assisting method
  • Method for preparing efficient polycarboxylate graft copolymer super plasticizer through microwave-assisting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 0.7mol methallyl polyoxyethylene ether (n=26), 0.3mol methoxypolyethylene glycol methacrylate (m=17), 0.05mol sodium methacrylate, 0.01mol vinyl acetate Ester, 3.5mol acrylic acid, 0.2mol sodium styrene sulfonate, 21mol water and 10.8g ammonium persulfate were added to the focused microwave reaction vessel at one time, and the temperature was 35°C, and the microwave radiation power was 110W. After copolymerization for 12 minutes, water was replenished. Adjust the concentration of the solution to 40%, and at the same time use 30% sodium hydroxide to neutralize to Ph=7, replenish water to adjust the concentration of the solution to 40%, and obtain the polyacrylic acid grafted polycarboxylic acid high-efficiency superplasticizer product PC -1, its polymerization dispersion index is 3.5.

Embodiment 2

[0050] Add 1 mol of methallyl polyoxyethylene ether (n=53) and 9.8 mol of water into a focusing microwave reaction vessel and stir evenly, heat up to 40°C, and after the microwave radiation power rises to 170W, add 0.02 mol of methallyl Sulfonic acid, 0.02mol vinyl propionate, 3.0mol acrylic acid, 0.1mol hydroxyethyl acrylate and 4.9mol water are configured into an aqueous solution; 8.4g potassium persulfate and 2.4mol water are configured into an aqueous solution, and the speed is controlled to focus on the microwave reaction vessel The monomer mixed solution and the initiator solution were added dropwise in the mixture, and the dropping time was 10 minutes. After the dropping was completed, the constant temperature was reacted for 10 minutes, and the water was replenished and neutralized to Ph=7 with a mass fraction of 40% triethanolamine to obtain a polyacrylic acid grafted polymer. Carboxylic acid high-efficiency superplasticizer product PC-2 has a polymerization dispersion...

Embodiment 3

[0052] Add 1 mol of methoxypolyethylene glycol methacrylate (m=54) and 10.8 mol of water into a focusing microwave reaction vessel, raise the temperature to 25°C, and after the microwave radiation power rises to 150W, add 11.2 g and 3.7 mol of water The prepared ammonium persulfate solution was added to the container once, and 0.01mol of allylsulfonic acid, 0.01mol of isopropenyl acetate and 5.4mol of water were prepared into an aqueous solution, which was the monomer b solution; 2.8mol of acrylic acid, 0.7mol of propylene Amide, 0.21mol hydroxybutyl acrylate, 0.14mol sodium styrene sulfonate and 5.4mol water are configured into an aqueous solution, which is the solution of monomer c. The dripping time of solution b is 7 minutes, and the dripping time of monomer c solution is 15 minutes. After the dripping is completed, the constant temperature reaction is carried out for 10 minutes, and the water is replenished and neutralized to Ph=7 with a mass fraction of 40% diethanolamine...

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Abstract

The invention relates to a method for preparing an efficient polycarboxylate graft copolymer super plasticizer through the microwave-assisting method. The super plasticizer is formed by a polymer monomer A, a polymer monomer B, a polymer monomer C, a polymer monomer D, a polymer monomer E, a polymer monomer F and a polymer monomer G in a copolymerization mode. The method for preparing the efficient polycarboxylate graft copolymer super plasticizer through the microwave-assisting method comprises the steps that firstly, a certain temperature and a certain microwave radiation power are set; secondly, the polymer monomers are added in microwave radiation, and namely, a long polyether, polyester, and a heteroatom side chain is introduced to a polymer chain; thirdly, the pH value is neutralized and adjusted. The water-soluble polycarboxylate concrete super plasticizer prepared according to the method has the advantages of being high in water-reducing rate, small in disperse index of molecular weight, good in overall performance, and good in compatibility with cement. The water-soluble polycarboxylate concrete super plasticizer further has the advantages that synthesis is environmentally friendly, the synthesis period is short, the technology is simple, cost is low, the price is reasonable, and the water-soluble polycarboxylate concrete super plasticizer is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a method for preparing high-efficiency superplasticizers of polycarboxylic acid graft copolymers by using a microwave-assisted method. Background technique [0002] With the vigorous development of my country's construction industry, the output of domestic ready-mixed concrete has increased year by year. The country's key engineering projects are also an important reason for stimulating the production of ready-mixed concrete. The implementation of strategies such as "Development of the West", "Revitalization of the Northeast Old Industrial Base", and "Rise of Central China" has stimulated local economic growth and infrastructure construction. my country's concrete development has made great progress so far, but the proportion of ready-mixed concrete in the total concrete is not high, and there is a gap compared with other countries in the world. At prese...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F212/14C08F220/28C08F228/02C08F220/56C08F220/58C08F212/08C08F2/46C04B24/26C04B24/16C04B103/30
Inventor 王栋民张力冉逄建军王浩李娟张述雄潘佳
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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