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Preparation method for hydrophobic-association cationic polyacrylamide

A polyacrylamide and hydrophobic association technology is applied in the field of preparation of hydrophobically associated water-soluble polymers, which can solve the problems of improving the difficulty of polymer purification, affecting the molecular weight of polymers, surfactant pollution, etc., and shortening the initiation of polymerization. The effect of short time, initiation polymerization time and rapid reaction

Active Publication Date: 2013-04-24
JIANGSU HENGFENG FINE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the synthetic method of hydrophobically associated polyacrylamide is the micellar copolymerization method, and the main disadvantages of this method are: first, the hydrophobic body content contained in the obtained hydrophobically associated polyacrylamide is very limited; Second, the use of traditional surfactants will affect the molecular weight of the polymer and increase the difficulty of polymer purification. At the same time, the residual surfactant in the polymer will cause new pollution in the water treatment process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: A method for preparing hydrophobically associated cationic polyacrylamide, the specific steps are as follows:

[0025] In the first step, add 18.6ml of distilled water, 0.021mol of propyl acyloxyethyl dimethyl benzyl ammonium chloride and 0.063mol of acrylamide monomer to the reaction device and stir evenly until completely dissolved to form a monomer aqueous solution, which is recorded as acrylamide Oxyethyl dimethyl benzyl ammonium chloride monomer and acrylamide monomer are the total monomers; a monomer aqueous solution with a mass concentration of the total monomer of 35% is prepared; acryloyl oxyethyl dimethyl benzyl chloride The ratio of the amount of ammonium chloride monomer and acrylamide monomer is 1:3;

[0026] In the second step, in the above monomer aqueous solution, add 0.05g of urea as a solubilizer (the quality of urea accounts for 0.5% of the total monomer mass), and add 0.004g of disodium edetate as a metal chelating agent, (B Disodium dia...

Embodiment 2

[0030] Example 2: A method for preparing hydrophobically associated cationic polyacrylamide, the specific steps are as follows:

[0031] In the first step, add 15 ml of distilled water, 0.01 mol of propyl acyloxyethyl dimethyl benzyl ammonium chloride and 0.1 mol of acrylamide monomer to the reaction device and stir until they are completely dissolved to form an aqueous monomer solution, which is recorded as acryloxy Ethyl dimethyl benzyl ammonium chloride monomer and acrylamide monomer are the total monomers; a monomer aqueous solution with a mass concentration of 40% of the total monomers is prepared; acryloyl oxyethyl dimethyl benzyl chloride The ratio of the amount of ammonium monomer to acrylamide monomer is 1:10;

[0032] In the second step, 0.1 g of urea is added as a solubilizer (the mass of urea accounts for 1.0% of the total monomer mass) in the above monomer aqueous solution, and 0.001 g of disodium edetate is added as a metal chelating agent (ethylenediaminetetra...

Embodiment 3

[0036] Example 3: A method for preparing hydrophobically associated cationic polyacrylamide, the specific steps are as follows:

[0037] In the first step, add 40 ml of distilled water, 0.014 mol of propyl acyloxyethyl dimethyl benzyl ammonium chloride and 0.084 mol of acrylamide monomer to the reaction device and stir until they are completely dissolved to form a monomer aqueous solution. Ethyl dimethyl benzyl ammonium chloride monomer and acrylamide monomer are the total monomers; a monomer aqueous solution with a mass concentration of 20% of the total monomers is prepared; acryloyl oxyethyl dimethyl benzyl chloride The ratio of the amount of ammonium monomer to acrylamide monomer is 1:6;

[0038] In the second step, 0.2 g of urea is added as a solubilizer (the mass of urea accounts for 2.0% of the total monomer mass) in the above monomer aqueous solution, and 0.003 g of disodium edetate is added as a metal chelating agent (ethylenediaminetetraacetic acid). Disodium amine...

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Abstract

The invention relates to a preparation method for hydrophobic-association cationic polyacrylamide. The preparation method comprises the following steps of: firstly, adding distilled water, acrylyl oxyehtyl dimethyl benzyl ammonium chloride monomer and acrylamide monomer to a reaction device, uniformly stirring the mateirals until the materials are completely dissolved into a monomer aqueous solution; secondly, adding proper solubilizer, metal-chelator and initator to the monomer aqueous solution, uniformly stirring the materials and regulating the pH value of the mixture; ventilating high-pure nitrogen gas to the reaction device for removing the air in the reaction device; thirdly, sealing the reaction device and then putting the sealed reaction device to a ultraviolet-light reaction device for carrying out a polymerization reaction to prepare hydrophobic-association cationic polyacrylamide colloid; and finally, purifying, washing and refining the colloid, and drying the treated colloid in a vacuum drying box and grinding the dried colloid to obtain the finished product. The preparation method disclosed by the invention has the advantages that the two monomers can be directly polymerized by an aqueous solution without adding surfactant, so that the process is simple, and the polymerization reaction time is short; moreover, the reaction process is free of temperature control, the energy consumption is reduced, and the production cost is reduced.

Description

technical field [0001] The invention relates to a method for preparing a hydrophobically associated water-soluble polymer, in particular to a method for preparing a hydrophobically associated cationic polyacrylamide. [0002] Background technique [0003] Hydrophobically associated polyacrylamide refers to a water-soluble polymer with a small amount of hydrophobic groups on the main chain of polyacrylamide. The hydrophobic part on this kind of water-soluble polymer is aggregated due to the hydrophobic effect, and associates in the aqueous solution to form a dynamic three-dimensional network structure. This structure makes the aqueous solution of the polymer have unique rheological properties, which can significantly improve The viscosity of the solution. In addition, the introduction of hydrophobic groups can reduce the hydrophilicity of the polymer, thereby enhancing its interaction with organic matter or some oily substances in sewage, thereby improving the phase transi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/34C08F2/48C08F4/04
Inventor 郑怀礼戴力廖熠薛文文许志楠唐晓旻廖勇
Owner JIANGSU HENGFENG FINE CHEM CO LTD
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