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Method for preparing anionic polyacrylamide

A polyacrylamide and anionic technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of complex process, low treatment efficiency, and long time consumption, and achieve the effect of simple preparation method, easy operation, and short preparation time

Inactive Publication Date: 2014-08-13
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the use of conventional polyacrylamide, it is first flocculated to form alum flowers, and then precipitated and separated. This process is time-consuming and complicated, resulting in very low treatment efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Preparation of modified ferric oxide:

[0029] (1) Mix ferric trichloride, ethylene glycol, and polyethylene glycol 400 evenly, put them into a closed reaction kettle and heat them to 200°C for 8 hours, and wash them with ethanol after the reaction; The mass ratio of iron oxide, ethylene glycol, polyethylene glycol 400 is 2.7: 60: 0.5;

[0030] (2) Disperse the prepared ferric ferric oxide in ethanol, then add isopropyl silicate and ammonia water, and mechanically stir for 12 hours to obtain a solid compound, which is washed with ethanol;

[0031] (3) Add the solid compound washed in the second step to the mixture of ethanol and water, then add KH550, and stir for 12 hours to obtain modified ferric oxide; the mass ratio of the solid compound to KH550 is 2: 1.

[0032] 2. Neutralize acrylic acid with sodium hydroxide to obtain sodium acrylate aqueous solution (mass concentration is 5%); according to the mass ratio, add 5 parts of acrylamide, 2-acrylamido-2-methyl 1...

Embodiment 2

[0034] 1. Preparation of modified ferric oxide:

[0035] (1) Mix ferric sulfate, glycerin, and polyethylene glycol 4000 evenly, put them into a closed reaction kettle and heat them to 160°C for 8 hours, and wash them with ethanol after the reaction; The mass ratio of triol and polyethylene glycol 4000 is 4: 9: 1.8;

[0036] (2) Disperse the prepared ferric ferric oxide in ethanol, then add tetraethyl orthosilicate, ammonia water, and mechanically stir for 12 hours to obtain a solid compound, which is washed with ethanol;

[0037] (3) Add the target substance prepared in the second step into the mixture of ethanol and water, then add KH570, and stir for 12 hours to obtain modified ferric oxide; the mass ratio of the solid compound to KH570 is 2: 1.

[0038] 2. Neutralize acrylic acid with sodium hydroxide to obtain sodium acrylate aqueous solution (mass concentration is 5%), add 10 parts of acrylamide, 2-acrylamido-2-methylpropanesulfonic acid 2 to 100 parts of sodium acrylat...

Embodiment 3

[0040] 1. Preparation of modified Fe3O4:

[0041] (1) Mix ferrous chloride tetrahydrate, ethylene glycol monophenyl ether, and polyvinyl alcohol 1788 evenly, put them in a closed reaction kettle and heat them to 220°C for 8 hours, and wash them with ethanol after the reaction; The mass ratio of described ferrous chloride tetrahydrate, ethylene glycol monophenyl ether, polyvinyl alcohol 1788 is 2: 80: 3.4;

[0042] (2) Disperse the prepared ferric ferric oxide in ethanol, then add tetraethyl orthosilicate, ammonia water, and mechanically stir for 12 hours to obtain a solid compound, which is washed with ethanol;

[0043] (3) Add the target substance prepared in the second step into the mixture of ethanol and water, then add KH560, and stir for 12 hours to obtain modified ferric oxide; the mass ratio of the solid compound to KH560 is 2: 1.

[0044]2. Neutralize acrylic acid with sodium hydroxide to obtain an aqueous solution of sodium acrylate (mass concentration is 5%), add 1...

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PUM

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Abstract

The invention discloses a method for preparing anionic polyacrylamide. The method comprises the following steps: coating silane-modified ferroferric oxide in the anionic polyacrylamide polymerization process, and obtaining the anionic polyacrylamide with magnetism. In the using process, the anionic polyacrylamide in early state can be flocculated with suspended solids in water to form alumen ustum, but in the later separation process, because magnetic ferroferric oxide nanoparticles are coated in the anionic polyacrylamide, the formed alumen ustum has a certain magnetism during sewage treatment; and in the separation process, the flocculate is rapidly separated from the water by utilizing acting force of an external magnetic field. Moreover, the whole process can be continuously operated and the sewage treatment efficiency is greatly improved.

Description

technical field [0001] The invention relates to a production technology of polyacrylamide, in particular to a preparation method of anionic polyacrylamide, which belongs to the field of polymer material preparation. Background technique [0002] The molecular chain of polyacrylamide is very long, and its amide group (-CONH 2 ) can have affinity with many substances and adsorb to form hydrogen bonds, which enables it to bridge between the adsorbed particles, connect several or even dozens of particles together, form flocs, and accelerate the sinking of particles. This is similar to the general flocculation mechanism, that is, one molecule can adsorb several particles at the same time, making them pull together and settle rapidly. Based on this, polyacrylamide can be used as a flocculant. [0003] Anionic polyacrylamide (PHP) flocculants are widely used in sewage treatment because of their excellent performance and environmental friendliness. PHP has the properties of flocc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/56C08F220/58C08F2/44C08K9/06C08K3/22C02F1/56
Inventor 蒋军路建美
Owner SUZHOU UNIV
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