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

A technology of polyacrylamide and high molecular weight, which is applied in the field of two-step preparation of instant anionic high molecular weight polyacrylamide, which can solve the problems of affecting the use effect, difficult to dissolve, and easy to agglomerate, so as to achieve not easy to agglomerate, fast The effect of dissolution rate

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-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 a hydrolyzing agent to the four-necked flask, and the hydrolyzing agent is a hydrogen hydroxide with a mass ratio of 5:1. A mixture of sodium and sodium carbonate, the amount of the hydrolyzing agent is 15% of the mass of the acrylamide monomer. Rotate at 400 rpm, blow nitrogen, stir for 30 minutes, and keep the temperature at 40°C. Heating to 70°C, reacting for 2 hours, raising the temperature to 75°C for 1 hour, and obtaining primary particles. The primary particles were hydrolyzed, the hydrolysis temperature was 80°C, and the hydrolysis time was 8 hours. In another flask, add 20g of ethanol and 100g of water to form a mixed solution. Th...

Embodiment 2

[0031] Add 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 until dissolved. Use a beaker to dissolve 95g of acrylamide and 0.8g of sodium persulfate in 200g of water, and add them to a four-necked flask under a nitrogen atmosphere; add a hydrolyzing agent to the four-necked flask, and the hydrolyzing agent is hydrogen peroxide with a mass ratio of 5:2. The mixture of sodium and sodium carbonate, the consumption of described hydrolysis agent is 18% of the mass of acrylamide monomer. Rotate at 400 rpm, blow nitrogen, stir for 30 minutes, and keep the temperature at 40°C. Heating to 70°C, reacting for 2 hours, raising the temperature to 75°C for 1 hour, and obtaining primary particles. The primary particles were hydrolyzed, the hydrolysis temperature was 85°C, and the hydrolysis time was 7 hours. In another flask, add 6g of ethanol and 50g of water to form a mixed solution. The alcohol-water...

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 them to a four-necked flask under a nitrogen atmosphere; add a hydrolyzing agent to the four-necked flask, and the hydrolyzing agent is A mixture of sodium hydroxide and sodium carbonate at a ratio of 5:3, the amount of the hydrolyzing agent is 20% of the mass of the 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, raise the temperature to 75°C and keep it for 1 hour to obtain primary particles. The primary particles were hydrolyzed, the hydrolysis temperature was 90°C, and the hydrolysis time was 6 hours. 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 f...

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Abstract

The invention discloses a method for preparing instant anionic high-molecular-weight polyacrylamide by a two-step method. The method comprises the following steps: (1) adding a dispersing agent into areaction kettle containing a hydrocarbon solvent, and heating to dissolve the dispersing agent; (2) adding 20-40% by mass of an acrylamide aqueous solution, a water-soluble initiator and a hydrolyticagent into a reaction kettle, and stirring to form a water-in-oil reaction system; (3) introducing nitrogen to remove oxygen in the reaction system; (4) heating the reaction system to react for a period of time to form polyacrylamide primary particles; hydrolyzing the primary particles; (5) dropwise adding an alcohol-water mixed solution into the reaction kettle, and stirring so that the polyacrylamide primary particles are aggregated to form solid particles similar to a'grape cluster 'structure; and (6) performing azeotropy to remove the alcohol and the aqueous solution to obtain the instantpolyacrylamide solid with high molecular weight. The polyacrylamide obtained by the two-step method has a fast dissolving speed in use and is not liable 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 anionic 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 papermakin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/56C08F8/12C08F2/32
CPCC08F2/18C08F120/56
Inventor 金学芳
Owner HENAN ZHENGJIA ENERGY ENVIRONMENTAL PROTECTION CO LTD
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