Reaction type dispersing agent and preparation method for polyacrylamide water emulsion

A polyacrylamide and acrylamide technology, applied in the field of polymer synthesis, can solve the problems of easy to obtain gel products, polymerization failure, etc., and achieve the effects of environment and operator friendliness, good stability and good fluidity

Active Publication Date: 2015-02-18
DESHI ENERGY TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In most current aqueous emulsion preparation processes, due to the "gel effect" in the polymerization mechanism of polyacrylamide, there is a self-accelerating process in the reaction process, which makes the polymerization speed of acrylamide copolymer greatly exceed the speed of precipitation from the dispersion system. Possibility, if not properly controlled, it is easy to get gel products, resulting in failure of polymerization

Method used

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  • Reaction type dispersing agent and preparation method for polyacrylamide water emulsion
  • Reaction type dispersing agent and preparation method for polyacrylamide water emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Synthesis of reactive dispersant Disp-1

[0035]Add 150kg of acryloyloxyethyltrimethylammonium chloride and 12kg of N-vinylpyrrolidone into a two-cubic reaction kettle, add 550kg of ethanol to dissolve; pass nitrogen gas into the reaction kettle to remove oxygen for 20 minutes; 3.2 kg of mercaptoethonium hydrochloride and 280 g of azobisisobutyronitrile were added. The reaction was stirred at 70°C for 4 hours. Add sodium hydroxide solution to adjust the pH value to 7.0, remove most of the solvent under reduced pressure, precipitate with 60 kg of ether three times, centrifuge, and dry to obtain a white solid macromonomer precursor;

[0036] Add 100kg of the aforementioned macromonomer precursor and 460kg of tetrahydrofuran to the reaction kettle, dissolve evenly; dissolve 18.5kg of acryloyl chloride in 80kg of tetrahydrofuran, add to the above solution while stirring, and drop 50kg of 30% sodium carbonate aqueous solution at the same time , using a jacketed reactor...

Embodiment 2

[0040] Same as Example 1, the difference is that the amount of N-vinylpyrrolidone in step (1) is changed to 5 kg, and the amount of mercaptoethylammonium hydrochloride is changed to 2.0 kg to obtain the corresponding product dispersant Disp-2, molecular weight test The results are shown in Table 1; the reactive dispersant Disp-1 in step (2) was changed to Disp-2 to obtain the CPAM aqueous emulsion product Hyem-2, and its performance test results are shown in Table 2.

Embodiment 3

[0042] (1) Synthesis of reactive dispersant Disp-3

[0043] Add 140kg of methacryloyloxyethyltrimethylammonium chloride and 15kg of N-vinylpyrrolidone into a two-cubic reaction kettle, add 550kg of ethanol to dissolve; feed nitrogen into the reaction kettle to remove oxygen for 20 minutes; Add 3.8kg of mercaptoethylammonium hydrochloride and 280g of azobisisobutyronitrile in the kettle. The reaction was stirred at 70°C for 4 hours. Add sodium hydroxide solution to adjust the pH value to 7.0, remove most of the solvent under reduced pressure, precipitate with 60 kg of ether three times, centrifuge, and dry to obtain a white solid macromonomer precursor;

[0044] Add 100kg of the above-mentioned macromonomer precursor and 460kg of tetrahydrofuran to the reaction kettle, and dissolve evenly; dissolve 20.1kg of acryloyl chloride in 80kg of tetrahydrofuran, add it to the above solution under stirring, and add 55kg of 30% sodium carbonate aqueous solution dropwise at the same time ...

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Abstract

The invention provides a reaction type dispersing agent and a preparation method for the polyacrylamide water emulsion. The method for preparing the water emulsion comprises the steps of preparing the reaction type dispersing agent; balancing the concentration of free radicals by multiple sections of composite initiating systems under the participation of a saline solution system and the dispersing agent, and performing water emulsion dispersing polymerization on acrylamide and cationic monomers. The water emulsion product can be quickly dissolved, has a high molecular weight, is high in flowability and high in stability and can be widely applied to the field of water treatment of all industries.

Description

technical field [0001] The invention belongs to the field of polymer synthesis, and relates to a preparation method of a reactive dispersant and polyacrylamide emulsion. Background technique [0002] Polyacrylamide is called "Baiye Auxiliary", among which cationic polyacrylamide (CPAM) is one of the most widely used varieties. CPAM is an acrylamide copolymer containing cationic structural units. The molecular chain can ionize polycations and small anions in water. The addition of cations in CPAM increases the adsorption of polymers to negatively charged colloids, polymers and solid surfaces. Adhesive ability, can cause strong electric neutralization, enhance its adsorption, adhesion, decolorization, precipitation and flocculation, etc., especially suitable for papermaking technology, food industry, construction engineering, metallurgical engineering, mineral processing coal powder, Treatment of sewage and wastewater in industries with high organic colloid content such as oi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/34C08F226/10C08F8/10C08F291/14C08F220/56C08F220/60C08F2/38
Inventor 吴江勇崔仕章谷之辉王黎明杨红梅
Owner DESHI ENERGY TECH GRP CO LTD
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