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Method for synthesizing cationic polyacrylamide by method using ultrasound to induce template polymerization

A polyacrylamide and template polymerization technology, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of uneven distribution of cationic monomers, long polymerization reaction time, weak charge neutralization ability, etc., and improve the polymerization reaction efficiency , Reduce energy consumption, high charge density effect

Inactive Publication Date: 2018-02-09
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for synthesizing cationic polyacrylamide by using ultrasonic-induced template polymerization to solve the problems of high energy consumption, long polymerization reaction time and uneven distribution of cationic monomers in the existing synthesis method. Uniformity leads to the problem of weak electrical neutralization ability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Weigh 8.4 g of acrylamide and 3.6 g of acrylamidopropyltrimethylammonium chloride in turn, and put them into a reagent bottle. Add 28 g deionized water again, stir, the mass concentration of preparing total monomer is the total monomer solution of 30%;

[0033] 2) Add 1.66 g sodium polyacrylate (molecular weight 3300) and 0.12 g urea to the above total monomer solution, stir well, then add sodium hydroxide solution or hydrogen chloride solution, and adjust the pH value of the above mixed solution to 4.5; The temperature was kept at 30°C, and irradiated with ultrasonic waves for 30 minutes, then filled with high-purity nitrogen to remove oxygen for 30 minutes, quickly added 20 mg of initiator azobisisobutylimidazoline hydrochloride (VA-044), and immediately sealed the reagent bottle;

[0034] 3) At 35°C, place the above-prepared mixed solution in an ultrasonic oscillator, use ultrasonic waves to initiate, the frequency is 45kHz, the power is 400W, after the polymeriza...

Embodiment 2

[0038]1) Weigh 9.8 g of acrylamide and 4.2 g of methacrylamidopropyltrimethylammonium chloride in turn, and put them into a reagent bottle. Add 26 g deionized water again, stir, the mass concentration of preparing total monomer is the total monomer solution of 35%;

[0039] 2) Add 1.99g sodium polymethacrylate (molecular weight 4200) and 0.14g urea to the above total monomer solution, stir well, then add sodium hydroxide solution or hydrogen chloride solution, and adjust the pH value of the above mixed solution to 4.5; Then keep the temperature at 35°C, and irradiate with ultrasonic waves for 30 minutes, then fill with high-purity nitrogen to remove oxygen for 30 minutes, quickly add 25 mg of initiator azobisisobutylamidine hydrochloride V-50, and immediately seal the reagent bottle;

[0040] 3) At 35°C, place the above-prepared mixed solution in an ultrasonic oscillator, use ultrasonic waves to initiate, the frequency is 45kHz, the power is 300W, after polymerization for 20 m...

Embodiment 3

[0044] 1) Weigh 11.2 g of acrylamide and 4.8 g of acrylamidopropyltrimethylammonium chloride in turn, and put them into a reagent bottle. Add 24 g deionized water again, stir, the mass concentration of preparing total monomer is the total monomer solution of 40%;

[0045] 2) Add 2.3g sodium polyacrylate (molecular weight 3300) and 0.16g urea to the above total monomer solution, stir well, then add sodium hydroxide solution or hydrogen chloride solution, adjust the pH value of the above mixed solution to 4.5; Keep the temperature at 35°C, and irradiate with ultrasonic wave for 30 minutes, then fill it with high-purity nitrogen to remove oxygen for 30 minutes, quickly add 25 mg of initiator azobisisobutylimidazoline hydrochloride (VA-044), and seal the reagent bottle immediately;

[0046] 3) At 35°C, place the above-prepared mixed solution in an ultrasonic oscillator, use ultrasonic waves to initiate, the frequency is 45kHz, and the power is 200W. After polymerization for 30 min...

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Abstract

The invention discloses a method for synthesizing cationic polyacrylamide by a method using ultrasound to induce template polymerization. The method is as follows: adding an acrylamide monomer, a cationic monomer, deionized water, a template and urea in turn in a reaction device, stirring uniformly, adjusting pH, processing the system into a homogeneous solution under ultrasonic irradiation, introducing nitrogen gas for deoxygenation, immediately sealing the reaction device after adding an initiator, finally, performing ultrasonic treatment at a certain frequency to induce polymerization, purifying, washing, refining, drying in a vacuum drying box, and grinding to obtain a final product. The cationic monomer of the cationic polyacrylamide prepared by the method is concentrated in distribution, large in molecular weight and high in charge density, and greatly improves the electric neutralization and bridging capacity of a flocculant. The method has the advantages of short polymerizationtime, low reaction temperature, high polymerization efficiency and simple experimental operation, reduces energy consumption and production cost, and suitable for dehydration treatment of drinking water, sewage and sludge, and has good application prospects.

Description

technical field [0001] The invention relates to a method for synthesizing cationic polyacrylamide, in particular to a method for synthesizing cationic polyacrylamide by template polymerization induced by ultrasonic waves. Background technique [0002] Coagulation is to add a coagulant to the wastewater to destroy the stability of the colloid, so that the fine suspended particles and colloid particles gather into coarser particles and settle and separate from the water, so that the wastewater can be purified. Coagulation includes two steps of coagulation and flocculation. Coagulation method is a method commonly used in water treatment, which can be used to reduce the turbidity and chromaticity of water, remove a variety of high molecular organic matter, some heavy metals and radioactive substances, and improve the dehydration performance of sludge. Currently commonly used flocculants can be divided into inorganic flocculants, organic flocculants, composite flocculants and bi...

Claims

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Application Information

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IPC IPC(8): C08F293/00C08F220/56C08F220/34C08F2/56C02F1/56
CPCC02F1/56C08F2/56C08F220/34C08F220/56C08F293/005
Inventor 郑怀礼冯力王莫茜孙强郑欣钰赵纯赵传靓
Owner CHONGQING UNIV
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