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Synthetic method of water-in-water type polyacrylamide emulsion

A polyacrylamide and synthesis method technology, applied in the field of chemical synthesis, can solve the problems of difficult stirring, high viscosity, drying, pulverization, poor solubility, etc., and achieve the effect of improving stability

Inactive Publication Date: 2011-11-23
临泽县奋君矿业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the dispersion polymerization method can produce polyacrylamide flocculants that are pollution-free and cost-effective; however, the viscosity during the polymerization process is high and it is difficult to stir, and the dry powder gel product obtained by solution polymerization needs to be dried, crushed, and has poor solubility. Will cause secondary pollution to the environment

Method used

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  • Synthetic method of water-in-water type polyacrylamide emulsion
  • Synthetic method of water-in-water type polyacrylamide emulsion
  • Synthetic method of water-in-water type polyacrylamide emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Install a stirrer, a reflux condenser, a dropping funnel and a thermometer on a 0.5L four-necked bottle, and place it in a water bath. Add 16.0g of monomeric acrylamide, 3.25g of 72% methacryloyloxyethyltrimethylammonium chloride aqueous solution, 56.0g of ammonium sulfate, 16g of stabilizer, 16g of tertiary Butanol and 100ml deionized water, deoxygenated by nitrogen gas for 0.5h. Add 0.03g of ammonium persulfate and 0.02g of sodium sulfite at 18°C ​​to trigger, after 1 hour of reaction, adjust the temperature to 50°C, add 0.03g of 2,2'-azo[2-(2-imidazolin-2-yl ) propane] dihydrochloride, and reacted for 8 h to obtain a polyacrylamide emulsion.

[0057] The performance indicators of polyacrylamide emulsion are as follows:

[0058] Stability: The emulsion is stable for three months without delamination.

[0059] The average molecular weight of polyacrylamide emulsion is 3.2 million.

[0060] The conversion rate of monomer was 99.7%.

Embodiment 2

[0062] Install a stirrer, a reflux condenser, a dropping funnel and a thermometer on a 0.5L four-necked bottle, and place it in a water bath. Add 15.0g monomeric acrylamide, 3.25g mass fraction of 72% methacryloyloxyethyltrimethylammonium chloride (DMC) aqueous solution, 56.0g ammonium sulfate, 14g stabilizer in the four-necked bottle , 15g of tert-butanol and 100ml of deionized water, deoxygenated with nitrogen for 0.5h. Add 0.03g ammonium persulfate and 0.02g sodium sulfite at 18°C ​​to initiate, after 1 hour of reaction, adjust the temperature to 50°C and add 0.03g of 2,2'-azo[2-(2-imidazolin-2-yl) Propane] dihydrochloride (VA-044), react for 6 h to obtain polyacrylamide emulsion.

[0063] The performance indicators of polyacrylamide emulsion are as follows:

[0064] Stability: The emulsion is stable for three months without delamination.

[0065] The average molecular mass of polyacrylamide emulsion is 3.19 million.

[0066] The conversion rate of monomer was 99.5%.

Embodiment 3

[0068] Install a stirrer, a reflux condenser, a dropping funnel and a thermometer on a 0.5L four-necked bottle, and place it in a water bath. Add 16.0g monomeric acrylamide to the four-necked bottle, 3.10g mass fraction is 72% methacryloyloxyethyltrimethylammonium chloride (DMC) aqueous solution, 56.0g ammonium sulfate, 16 g stabilizer, 16g of tert-butanol and 100ml of deionized water, deoxygenated by nitrogen gas for 0.5h. Add 0.04g ammonium persulfate and 0.03g sodium sulfite to initiate at 18°C. After 1 hour of reaction, adjust the temperature to 50°C and add 0.05g of 2,2'-azo[2-(2-imidazolin-2-yl ) propane] dihydrochloride, reacted for 8h to obtain polyacrylamide emulsion.

[0069] The performance indicators of polyacrylamide emulsion are as follows:

[0070] Stability: The emulsion is stable for three months without delamination.

[0071] The average molecular weight of the polyacrylamide emulsion is 3.22 million.

[0072] The conversion rate of monomer is 99.6% 。

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Abstract

The invention provides a synthetic method of a water-in-water type polyacrylamide emulsion with good flowability and stability, belonging to the field of chemical synthesis. The synthetic method comprises the following steps of: carrying out dispersion polymerization by taking a mixed system comprising tertiary butyl alcohol, ammonium sulphate and water as a reaction medium, monomer acrylamide and methacryloxy ethyl trimethyl ammonium chloride as raw materials, a mixture containing ammonium persulfate, sodium sulfite and 2,2'-azo[2-(2-imidazoline-2-group)-propane] dihydrochloride as a composite initiator and a polymer containing acrylamide and vinyl caprolactam as a dispersion stabilizer so as to obtain the polyacrylamide emulsion with good flowability and stability, wherein the relative average molecular weight of the polyacrylamide emulsion is 2,800,000-3,200,000; and the transformation ratio of the monomer acrylamide is more than 99.5 percent.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and relates to a synthesis method of polyacrylamide emulsion, in particular to a synthesis method of water-in-water polyacrylamide emulsion. Background technique [0002] Polyacrylamide (PAM) is a linear water-soluble polymer widely used in water treatment, papermaking, oil extraction, mining and metallurgy and other fields. It is the most widely used flocculant with the best effect in the world. The polymerization methods of PAM mainly include aqueous solution polymerization, inverse suspension polymerization, inverse emulsion polymerization, inverse microemulsion polymerization, precipitation polymerization and dispersion polymerization. Dispersion polymerization of acrylamide is a new type of acrylamide polymerization method, which has attracted widespread attention. Although the dispersion polymerization method can produce polyacrylamide flocculants that are pollution-free and co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/34C08F2/12
Inventor 姚进如李鸿洲祁自和
Owner 临泽县奋君矿业有限公司
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