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Preparation method of hydrophobic association type cationic polyacrylamide

A technology of polyacrylamide and hydrophobic association, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of flocculation efficiency and treatment object range limitation, random distribution of cations, and inability of hydrophobic components to play a role, so as to improve Excellent solid-liquid separation performance, good flocculation performance, and convenient operation

Inactive Publication Date: 2018-03-20
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for preparing a hydrophobic association cationic polyacrylamide, so as to solve the problem that the cations in the existing cationic polyacrylamide are randomly distributed and cannot be combined with the treated objects. The hydrophobic component plays a role, and the flocculation efficiency and the range of treatment objects are greatly limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: a kind of preparation method of hydrophobic association type cationic polyacrylamide comprises the following steps:

[0025] Step 1: Add 15.1ml of deionized water to the reaction device; 6.47g of sodium polyacrylate (PAAS) with a molecular weight of 3400; 4.71g of acryloyloxyethyltrimethylammonium chloride (DAC) (nDAC: nPAAS=1 :1); 12.0g of acrylamide (AM) monomer; 0.337g of lauryl acrylate (LA); 1.3g of nonionic surfactant Tween80 and stirred evenly until the monomer was completely dissolved to form a uniform micellar solution. AM monomer and DAC monomer in the polymerization system are the total monomers, so the mass fraction of the total monomers in the reaction system is 40%.

[0026] In the second step, add 0.07 g of urea to the above-mentioned monomer micelle solution as a solubilizer, use HCl as a pH regulator to adjust the pH value of the micellar copolymerization system to 4, continuously feed high-purity nitrogen into the reaction device for 15 m...

Embodiment 2

[0030] Embodiment 2: a kind of preparation method of hydrophobic association type cationic polyacrylamide comprises the following steps:

[0031]In the first step, add 24.24ml of deionized water to the reaction device; 4.05g of sodium polyacrylate (PAAS) solution with a molecular weight of 3400; 2.94g of acryloyloxyethyltrimethylammonium chloride (DAC) (nDAC: nPAAS= 1:1); Acrylamide (AM) monomer 7.5g; Lauryl acrylate (LA) 0.211g; Non-ionic surfactant Tween80 0.8 g Stir well until the monomer is completely dissolved to form a uniform micellar solution, the micelles AM monomer and DAC monomer are the total monomers in the copolymerization system, so the mass fraction of the total monomers in the reaction system is 25%.

[0032] In the second step, add 0.26g urea to the above-mentioned monomer micelle solution as a solubilizer, adjust the pH value of the micelle copolymerization system to 4 with HCl as a pH regulator, and continuously feed high-purity nitrogen into the reaction d...

Embodiment 3

[0036] Embodiment 3: a kind of preparation method of hydrophobic association type cationic polyacrylamide comprises the following steps:

[0037] In the first step, add 17.82ml of deionized water to the reaction device; 9.71g of sodium polyacrylate (PAAS) with a molecular weight of 5700; 7.06g of acryloyloxyethyltrimethylammonium chloride (DAC) (nDAC: nPAAS=1 :1); acrylamide (AM) monomer 4.0g; methyl acrylate (MA) 0.53g; nonionic surfactant Tween80 0.8g and stir until the monomer is completely dissolved to form a uniform micellar solution, and the micelles are copolymerized The AM monomer and DAC monomer in the system are the total monomers, so the mass fraction of the total monomers in the reaction system is 25%.

[0038] In the second step, add 0.069g urea to the above-mentioned monomer micelle solution as a solubilizer, use HCl as a pH regulator to adjust the pH value of the micellar copolymerization system to 6, continuously feed high-purity nitrogen into the reaction devi...

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PUM

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Abstract

The invention discloses a preparation method of hydrophobic association type cationic polyacrylamide. The preparation method specifically comprises the following steps of under the condition of existence of a nonionic surfactant, adding a certain ratio of acrylamide monomer, cation monomer, low molecular weight anionic polymer and deionized water into a reaction device, and completely and uniformly stirring, so as to form a micelle copolymerizing system; adding a small amount of solubilizer and photo-sensitive initiator into the micelle copolymerizing system, and uniformly stirring; after theoxygen in the device is completely exhausted, sealing the device, placing into an ultraviolet reaction device, and performing photo-initiating micelle copolymerizing and reaction, so as to obtain a hydrophobic association type cationic polyacrylamide gel with a block structure; finally, purifying the gel, refining, drying and granulating, so as to obtain a final product. The prepared hydrophobic association type cationic polyacrylamide has the advantages of hydrophobic association property, centralized distribution of cationic groups, strong electron neutralizing ability, high molecular weightand the like, has good flocculation property, and can be widely applied to multiple types of sewage treatment and sludge dewatering technology.

Description

technical field [0001] The invention belongs to the field of environmental wastewater treatment, and in particular relates to a method for preparing hydrophobic association cationic polyacrylamide. Background technique [0002] The flocculation process is widely used because of its simplicity and economy. The core of the flocculation process lies in the selection of flocculants. Cationic polyacrylamide (Cationicpolyacrylamide, abbreviated as CPAM) is a linear polymer with positively charged active groups randomly distributed on its molecular chain, which can be electrically neutralized and neutralized with negatively charged colloidal particles in wastewater. The adsorption bridging effect makes the colloidal particles in the system destabilized, aggregated, and settled to achieve the purpose of solid-liquid separation. Hydrophobic modification of CPAM can effectively improve its flocculation performance. Introducing a small amount of hydrophobic groups on the cationic po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F293/00C08F220/56C08F220/18C08F220/34C08F220/14C08F2/48C08F2/30C02F1/56
CPCC02F1/56C08F2/30C08F2/48C08F293/00C08F220/56C08F220/34
Inventor 郑怀礼周于皓安延严郑欣钰曲雯琪翟俊李翊森
Owner CHONGQING UNIV
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