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Method for preparing cationic polyacrylamide through photo-initiating system

A technology for polyacrylamide and acrylamide monomers is applied in the field of preparing cationic polyacrylamide by a novel photoinitiating system, which can solve the problems of high thermal initiation energy consumption, many types of additives, low production efficiency and the like, and achieves low reaction energy consumption, Easy to select and fast response effects

Active Publication Date: 2017-09-12
SHENGLI OIL FIELD FANGYUAN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another example is the patent "Preparation Method of Instant Cationic Polyacrylamide" with Publication No. 101921365B, which introduces a method for preparing CPAM through thermal initiation. The CPAM prepared by this method has good solubility and can be used as an organic flocculant, paper strengthening agent, Retention aids are used in urban life and industrial sewage treatment and papermaking, but this method also has shortcomings such as many types of additives, high energy consumption for thermal initiation, and long reaction time (low production efficiency).

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of photoinitiating system prepares the method for CPAM flocculant, concrete steps are as follows:

[0027] In the first step, 25.5ml of deionized water, 7.2g of acrylamide monomer (accounting for 90% of the total mass of the total monomer, and 20% of the total mass of the reaction system), 0.8g of DMC monomer ( Accounting for 10% of the total monomer mass), co-solvent urea 2.0ml (solution concentration 8.0×10 -3 g / ml, accounting for 2.0‰ of the total monomer mass), after complete dissolution, adjust the pH value of the above solution to 3 with a weak acid or weak base.

[0028] In the second step, while filling the reaction device with high-purity nitrogen to remove the air in the reaction device, 0.5ml of V-044 (solution concentration 9.6 × 10 -4 g / ml, accounting for 0.06‰ of the total monomer mass), 2.0ml of potassium persulfate (solution concentration 2.0×10 -3g / ml, accounting for 0.5‰ of the total monomer mass), 2.0ml of sodium bisulfite (solution concentra...

Embodiment 2

[0032] A kind of photoinitiating system prepares the method for CPAM flocculant, concrete steps are as follows:

[0033] In the first step, 15.0ml of deionized water, 4.0g of acrylamide monomer (accounting for 20% of the total mass of the total monomer, 50% of the total mass of the reaction system), 16.0g of DMC monomer (accounting for total monomer mass 80%), co-solvent urea 1.0ml (solution concentration 1.0×10 -2 g / ml, accounting for 0.5‰ of the total monomer mass), after complete dissolution, adjust the pH value of the above solution to 9 with a weak acid or weak base.

[0034] In the second step, while filling the reaction device with high-purity nitrogen to remove the air in the reaction device, 2.0ml of V50 (solution concentration 6.0×10 -3 g / ml, accounting for 0.6‰ of the total monomer mass), 1.0ml of ammonium persulfate (solution concentration 6.0×10 -4 g / ml, accounting for 0.03‰ of the total monomer mass), 1.0ml of sodium sulfite (solution concentration 1.2×10 -3 g...

Embodiment 3

[0038] A kind of photoinitiating system prepares the method for CPAM flocculant, concrete steps are as follows:

[0039] In the first step, 30.0ml of deionized water, 4.2g of acrylamide monomer (accounting for 70% of the total monomer mass, 15% of the total mass of the reaction system), 1.8g of DMDAAC monomer (accounting for total monomer mass 30%), co-solvent urea 1.0ml (solution concentration 2.4×10 -3 g / ml, accounting for 0.4‰ of the total monomer mass), after complete dissolution, adjust the pH value of the above solution to 6 with a weak acid or weak base.

[0040] In the second step, while filling the reaction device with high-purity nitrogen to remove the air in the reaction device, 1.0ml of V50 (solution concentration 1.2×10 -3 g / ml, accounting for 0.2‰ of the total monomer mass), 1.0ml of potassium persulfate (solution concentration 2.4×10 -4 g / ml, accounting for 0.04‰ of the total monomer mass), 1.0ml of sodium bisulfite (solution concentration 7.2×10 - 4 g / ml, a...

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Abstract

The invention relates to a method for preparing cationic polyacrylamide through a photo-initiating system. The method comprises the following steps of sequentially adding deionized water, acrylamide monomer, cationic monomer and cosolvent into a quartz reaction device until the materials are completely dissolved; adjusting a pH value of a solution; sequentially adding an azo initiator and a redox initiator into the reaction device while introducing high-purity nitrogen; sealing the reaction device and then putting the reaction device on an ultrasonicscope to be evenly oscillated; putting the reaction device on a rotary disk which rotates at a constant speed; utilizing a control method of low light intensity at first and then high light intensity to react; curing, washing, refining, drying and grinding generated polyacrylamide colloid to obtain a final product. The method can keep a certain concentration of free radicals in a reaction system and guarantees that chain growth proceeds evenly and orderly; the prepared polyacrylamide has good solubility and good flocculating performance; furthermore, an ultraviolet photo-initiating method has the advantages of low production energy consumption, high production efficiency, simpleness to operate, easiness to control and the like; the method disclosed by the invention has a good market application prospect.

Description

technical field [0001] The invention relates to a method for synthesizing high-molecular polymers in an aqueous solution, in particular to a method for preparing cationic polyacrylamide with a novel photoinitiating system. Background technique [0002] Cationic polyacrylamide (English name cationic polyacrylamide, abbreviated as CPAM) is one of the most widely studied and applied organic polymer flocculants, because CPAM has positively charged active groups on its molecular chain and is a linear polymer polymer. It can destabilize and flocculate colloidal particles and suspended matter in water through electrical neutralization, adsorption bridging, etc., so as to achieve the purpose of sludge dehydration and sewage treatment. At present, there are two methods for preparing CPAM: cationic modification of polyacrylamide and copolymerization. The polyacrylamide cationic modification method is mainly realized by methylol reaction or Mannich reaction. The CPAM products prepared...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/34C08F226/02C08F2/48C08F4/40C08F4/04C08F2/01C02F1/56
CPCC02F1/56C08F2/01C08F2/48C08F4/04C08F4/40C08F220/34C08F220/56C08F226/02
Inventor 关庆庆王城新丁克强徐进曾浩伟李璨
Owner SHENGLI OIL FIELD FANGYUAN CHEM IND
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