Method for preparing instant-soluble cationic high molecular weight polyacrylamide by two-step method

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 affecting the use effect, difficulty in dissolving, large dust, etc., and achieves not easy to agglomerate, large specific surface area , the effect of fast dissolution rate

Active Publication Date: 2018-12-18
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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  • Method for preparing instant-soluble cationic high molecular weight polyacrylamide by two-step method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 300 g of cyclohexane into a 1 L four-neck flask, add 1.15 g of sorbitan monostearate and 1 g of sucrose fatty acid ester with an HLB value of 3, and heat until dissolved. Dissolve 95g of acrylamide and 0.8g of potassium persulfate in 200g of water in a beaker, and add them to a four-necked flask under a nitrogen atmosphere; add cationic comonomer DAC to the four-necked flask, and the amount of DAC is the mass of acrylamide monomer 20% of. 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, then raise the temperature to 75°C and keep for 1 hour. In another flask, add 20g of ethanol and 100g of water to form a mixed solution. The alcohol-water mixed solution was added dropwise into the four-neck flask, and the dropwise addition was completed within half an hour, and the stirring was continued for half an hour. Azeotropic removal of water yielded white solid particles with an average particle size...

Embodiment 2

[0031] Add 300g of n-hexane into a 1L four-neck flask, add 2g of hydrophobic nano-silica and 1g of diethylene glycol fatty acid ester, and heat until dissolved. Dissolve 95g of acrylamide and 0.8g of sodium persulfate in 200g of water in a beaker, and add them to a four-necked flask under a nitrogen atmosphere; add cationic comonomer DMC to the four-necked flask, and the amount of DMC is the mass of acrylamide monomer 30% of. 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, then raise the temperature to 75°C and keep for 1 hour. In another flask, add 6g of ethanol and 50g of water to form a mixed solution. The alcohol-water mixed solution was added dropwise into the four-neck flask, and the dropwise addition was completed within half an hour, and the stirring was continued for half an hour. Azeotropic removal of water yielded white solid particles with an average particle size of 450 μm.

Embodiment 3

[0033]Add 300 g of toluene into a 1 L four-neck flask, add 3 g of glyceryl monostearate, and heat until dissolved. Use a beaker to dissolve 95g of acrylamide and 0.8g of azobisisobutylimidazoline hydrochloride in 200g of water, and add it to a four-necked flask under a nitrogen atmosphere; add cationic comonomer dimethylaminomethylpropene to the four-necked flask Acyloxyethyltrimethylammonium chloride, the amount of dimethylaminomethacryloyloxyethyltrimethylammonium chloride is 45% of the mass of acrylamide monomer. Rotate at 400 rpm, blow nitrogen, stir for 30 minutes, and keep the temperature at 40°C. Heat to 60°C, react for 2 hours, then raise the temperature to 75°C and keep for 1 hour. In another flask, add 10g of isopropanol and 100g of water to form a mixed solution. The alcohol-water mixed solution was added dropwise into the four-neck flask, and the dropwise addition was completed within half an hour, and the stirring was continued for half an hour. Azeotropic remo...

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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 preparation method of high molecular weight polyacrylamide, in particular to a two-step method for preparing instant cationic high molecular weight polyacrylamide. Background technique [0002] Polyacrylamide (PAM) is a linear polymer obtained by free radical polymerization of acrylamide monomers. It is widely used in petroleum exploration, water treatment, chemical industry, metallurgy, papermaking and other fields. Petroleum extraction is currently the field with the largest amount of PAM in China. Water treatment is the second largest consumption field of PAM in China. In terms of urban sewage treatment, PAM is mainly used for sludge dewatering, and a small part is used for wastewater clarification. In the paper industry, PAM is mainly used as retention aid, dry strengthening agent and flocculant for wastewater treatment. my country is a big country in papermaking production and consumption, and the demand for papermaki...

Claims

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Application Information

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Patent Type & Authority Applications(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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