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Method for preparing instant 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 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, and no easy caking effect

Inactive Publication Date: 2020-11-10
金学芳
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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 high-molecular-weight polyacrylamide by two-step method
  • Method for preparing instant high-molecular-weight polyacrylamide by two-step method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 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 put them into a four-necked flask under a nitrogen atmosphere. 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 of 350 μm.

Embodiment 2

[0030] 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 into a four-necked flask under a nitrogen atmosphere. 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

[0032] Add 300 g of toluene into a 1 L four-neck flask, add 3 g of glyceryl monostearate, and heat until dissolved. Dissolve 95g of acrylamide and 0.8g of azobisisobutylimidazoline hydrochloride in 200g of water in a beaker, and add them into a four-necked flask under a nitrogen atmosphere. 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 removal of water yielded white solid particles with an average particle size of 400 μm.

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Abstract

The invention discloses a method for preparing instant high-molecular-weight polyacrylamide by a two-step method, which comprises the following steps: (1) adding a dispersing agent into a reaction kettle containing a hydrocarbon solvent, and heating to dissolve the dispersing agent; (2) adding 20-40% by mass of an acrylamide aqueous solution and a water-soluble initiator into the reaction kettle in the step (1), and stirring to disperse the aqueous solution into the hydrocarbon solvent to form a water-in-oil reaction system; (3) introducing nitrogen, and removing oxygen in the reaction liquidand the reaction kettle; (4) heating the reaction system to react for a period of time to form polyacrylamide primary particles; (5) dropwise adding an alcohol-water mixed solution into the reaction kettle, stirring, and controlling the dosage of the alcohol-water mixed solution and the alcohol-water ratio, so that the polyacrylamide primary particles are aggregated to form solid particles similarto a'grape bunch 'structure; and (6) heating to boil, and azeotropic to remove the alcohol and the aqueous solution, thereby obtaining the instant polyacrylamide solid with high molecular weight. Thepolyacrylamide obtained by the two-step method has a fast dissolving speed in use and is not easy to cake.

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 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 papermaking additi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/56C08F2/18C08J3/16C08L33/26
CPCC08F2/18C08F120/56C08J3/16C08J2333/26C08F2500/01
Inventor 金学芳
Owner 金学芳
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