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A two-step method for preparing instant cationic high molecular weight polyacrylamide

A technology of polyacrylamide and high molecular weight, which is applied in the field of two-step preparation of instant cationic high molecular weight polyacrylamide, which can solve the problems of difficult dissolution, large dust, and influence on the use effect, and achieve fast dissolution speed, large specific surface area, Not easy to agglomerate

Active Publication Date: 2020-11-03
HENAN ZHENGJIA ENERGY ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such small particles cause relatively large dust during use and are prone to agglomeration
Especially during the dissolution process, due to the large specific surface area, it will quickly aggregate and form white lumps when added to water, making it difficult to further dissolve, affecting its practical use effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 300 g of cyclohexane into a 1 L four-necked flask, add 1.15 g of sorbitan monostearate and 1 g of sucrose fatty acid ester with an HLB value of 3, and heat to dissolve. Use a beaker to dissolve 95g of acrylamide and 0.8g of potassium persulfate in 200g of water, add them to a four-necked flask under a nitrogen atmosphere; add the cationic comonomer DAC to the four-necked flask, and the amount of DAC used is the mass of acrylamide monomer 20% of it. Rotate at 400 rpm, blow nitrogen, stir for 30 minutes, and keep the temperature at 40°C. Heat to 70°C, react for 2 hours, and heat to 75°C for 1 hour. In another flask, add 20 g of ethanol and 100 g of water to make a mixed solution. The alcohol-water mixed solution was added dropwise to the four-necked flask, the addition was completed within half an hour, and the stirring continued for half an hour. Azeotropically remove water to obtain white solid particles with an average particle size of 350 μm.

Embodiment 2

[0031] Put 300g of n-hexane into a 1L four-necked flask, add 2g of hydrophobic nano silica and 1g of diethylene glycol fatty acid ester, and heat to dissolve. Use a beaker to dissolve 95g of acrylamide and 0.8g of sodium persulfate in 200g of water, add them to a four-necked flask under a nitrogen atmosphere; add the cationic comonomer DMC to the four-necked flask, and the amount of DMC is the mass of acrylamide monomer 30% of it. Rotate at 400 rpm, blow nitrogen, stir for 30 minutes, and keep the temperature at 40°C. Heat to 70°C, react for 2 hours, and heat to 75°C for 1 hour. In another flask, add 6 g of ethanol and 50 g of water to make a mixed solution. The alcohol-water mixed solution was added dropwise to the four-necked flask, the addition was completed within half an hour, and the stirring continued for half an hour. Azeotropically remove water to obtain white solid particles with an average particle size of 450 μm.

Embodiment 3

[0033] Put 300g of toluene into a 1L four-necked flask, add 3g of glycerol monostearate, and heat to dissolve. In a beaker, dissolve 95g of acrylamide and 0.8g of azobisisobuimidazoline hydrochloride in 200g of water, add them to a four-necked flask under a nitrogen atmosphere; add the cationic comonomer dimethylaminomethyl propylene to the four-necked flask Acyloxyethyl trimethylammonium chloride, the amount of dimethylaminomethacryloxyethyltrimethylammonium chloride is 45% of the mass of the acrylamide monomer. Rotate at 400 rpm, blow nitrogen, stir for 30 minutes, and keep temperature at 40°C. Heat to 60°C, react for 2 hours, and heat to 75°C for 1 hour. In another flask, add 10 g of isopropanol and 100 g of water to make a mixed solution. The alcohol-water mixed solution was added dropwise to the four-necked flask, the addition was completed within half an hour, and the stirring continued for half an hour. Azeotropically remove water to obtain white solid particles with ...

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Abstract

The invention discloses a method for preparing instant-soluble cationic high molecular weight polyacrylamide by a two-step method. The method comprises the following steps: (1) adding a dispersing agent to a reaction vessel containing a hydrocarbon solvent, and heating the materials to dissolve the dispersing agent; (2) adding 20 to 40% by mass of an acrylamide aqueous solution, a water-soluble initiator, and a cationic comonomer to the reaction vessel and stirring the materials to form a water-in-oil reaction system; (3) introducing nitrogen gas, and removing oxygen in the reaction system; (4) heating the reaction system to a reaction for a period of time to form primary particles of polyacrylamide; 5) adding an alcohol-water mixed solution to the reaction vessel, stirring the materials,and aggregating the primary particles of polyacrylamide to form solid particles similar to a grape bunch structure; and (6) heating and boiling to remove the alcohol and the aqueous solution, and obtaining the instant-soluble high molecular weight polyacrylamide solid. The polyacrylamide obtained by the two-step method has a faster dissolution rate when used, and is not easily agglomerated.

Description

Technical field [0001] The invention relates to a method for preparing high molecular weight polyacrylamide, in particular to a method for preparing fast-dissolving cationic high molecular weight polyacrylamide by a two-step method. Background technique [0002] Polyacrylamide (PAM) is a linear polymer obtained by free radical polymerization of acrylamide monomer. It is widely used in petroleum exploitation, water treatment, chemical industry, metallurgy, papermaking and other fields. Petroleum extraction is currently the largest domestic use of PAM. Water treatment is the second largest consumption area of ​​domestic PAM. In urban sewage treatment, PAM is mainly used for sludge dewatering, and a small part is used for wastewater clarification. PAM is mainly used as a retention aid, dry enhancer and flocculant for wastewater treatment in the paper industry. my country is a big country of papermaking production and consumption, and the demand for papermaking additives is very s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/56C08F8/12C08F2/32
CPCC08F2/32C08F8/12C08F120/56
Inventor 金学芳
Owner HENAN ZHENGJIA ENERGY ENVIRONMENTAL PROTECTION CO LTD
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