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Method for synthesizing high molecular weight instant anionic polyacrylamide

A technology of polyacrylamide and synthesis method, which is applied in the synthesis field of high molecular weight instant anionic polyacrylamide, can solve the problems of long induction period, non-polymerization, increased production cost, etc. The effect of improving efficiency

Inactive Publication Date: 2011-04-06
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another example is CN 1168894A which discloses a preparation method of high-molecular-weight instant anionic polyacrylamide. 2 Gas drives oxygen and controls the pH value of the reaction system. Adding persulfate, water-soluble organic azo salt and nitrogen triacrylamide multi-initiator initiates the homopolymerization of acrylamide aqueous solution, and then hydrolyzes it to prepare a molecular weight of 15 million to 20 million. The dissolution time is within 40 minutes, and the method uses CO 2 The gas adjusts the pH value, the repeatability of the experiment is poor, and the monomer is treated with ion exchange resin before initiation, which increases the production cost
[0003] Due to the many impurities in the pre-adding alkali co-hydrolysis reaction system and the low solubility of the hydrolyzing agent, the induction period of the monomer at low temperature is long and even non-polymerization is prone to occur, and the performance of the prepared product is unstable. Molecular weight and dissolution rate are also limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this example, a synthetic method of high molecular weight instant anionic polyacrylamide is operated according to the following steps:

[0025] Using the method of pre-adding alkali co-hydrolysis, mix 160g of acrylamide monomer and 480g of deionized water evenly to form an aqueous solution of acrylamide monomer with a mass concentration of 25%, and then add 24g of hydrolyzing agent sodium carbonate and oxidizing agent over Potassium sulfate 0.048g, water-soluble organic azo salt 2,2'-azo(2-amidinopropane) dihydrochloride 0.16g, reducing agent urea 16g, chain extender β-dimethylaminopropionitrile 0.8g , 0.016g of chain transfer agent sodium formate and 0.048g of complexing agent benzoyl acetone, then add 2.5g of pH regulator ammonium bicarbonate to adjust the pH value to 11, then cool down to 10°C, move into the jar, Close the system after blowing nitrogen for 15-20 minutes, put the jar in the heat preservation jacket, and the system rises to the highest temperature a...

Embodiment 2

[0027] In this example, a synthetic method of high molecular weight instant anionic polyacrylamide is operated according to the following steps:

[0028] Using the method of pre-adding alkali and co-hydrolysis, mix 160g of acrylamide monomer and 480g of deionized water evenly to prepare an aqueous solution of acrylamide monomer with a mass concentration of 25%, and then add a hydrolysis solution with a mass ratio of 3.2:1 under stirring. Agent sodium carbonate and sodium bicarbonate 26.5g, oxidant ammonium persulfate 0.16g, water-soluble organic azo salt 2,2'-azo(2-amidinopropane) dihydrochloride 0.08g, reducing agent urea 4.8g, 0.08g of chain extender β-dimethylaminopropionitrile, 0.128g of chain transfer agent sodium formate and 0.048g of complexing agent ethyl acetoacetate, then add 5g of pH regulator ammonium bicarbonate to adjust the pH value to 10.5, then cool down to 15°C , move it into a jar, blow nitrogen into the jar for 15-20 minutes, then close the system, put the ...

Embodiment 3

[0030] In this example, a synthetic method of high molecular weight instant anionic polyacrylamide is operated according to the following steps:

[0031] Using the method of pre-adding alkali and co-hydrolysis, mix 160g of acrylamide monomer and 480g of deionized water evenly to prepare an aqueous solution of acrylamide monomer with a mass concentration of 25%, and then add a hydrolysis solution with a mass ratio of 1.9:1 under stirring. Agent sodium carbonate and sodium bicarbonate 27.5g, oxidant sodium persulfate 0.008g, water-soluble organic azo salt 2,2'-azo(2-amidinopropane) dihydrochloride 0.08g, reducing agent urea 6.4g, 0.16g of chain extender β-dimethylaminopropionitrile, 0.16g of chain transfer agent sodium acetate and 0.48g of complexing agent benzoyl acetone, then add 2.5g of pH regulator ammonium carbonate to adjust the pH value to 10 and then cool down to 15 ℃, move it into a jar, blow nitrogen into the jar for 15-20 minutes, then close the system, put the jar in...

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Abstract

The invention discloses a method for synthesizing high molecular weight instant anionic polyacrylamide, which is characterized in that: an alkaline hydrolysis method is adopted, and comprises the following steps of: preparing aqueous solution of acrylamide monomer from the acrylamide monomer by using deionized water, adding a hydrolytic agent, a composite initiator and an auxiliary agent, regulating the pH value to be between 8.5 and 12, introducing nitrogen, expelling oxygen and sealing a system at the temperature of between 10 and 25 DEG C, polymerizing under the heat insulation condition, and hydrolyzing, crushing, drying and grinding to obtain instant anionic polyacrylamide solid powder with the viscosity-average molecular weight of 15,000,000 to 21,000,000 and the dissolution time of shorter than 0.5 hour. A novel coordination agent and a novel pH value regulator are adopted, the method is easy and convenient to operate, the initiation speed of the monomer is high, the dissolution speed of a product is high, the reaction rate and the molecular weight of the product are controllable, the method is suitable for production on different scales, and the product is suitable for industries such as papermaking dispersants, tertiary oil recovery, beneficiation, sewage treatment and the like.

Description

1. Technical field [0001] The invention belongs to a method for synthesizing water-soluble polymer materials, in particular to a method for synthesizing high molecular weight instant anionic polyacrylamide. 2. Background technology [0002] At present, the preparation of high-molecular-weight instant anionic polyacrylamide at home and abroad mainly adopts the pre-adding alkali co-hydrolysis method, that is, adding hydrolyzing agents such as sodium carbonate, sodium bicarbonate or sodium hydroxide, auxiliary agents and initiators to the aqueous acrylamide solution. Nitrogen is passed to drive oxygen at high temperature, polymerization is initiated under adiabatic or semi-adiabatic conditions, and anionic polyacrylamide is obtained by heating and hydrolysis. As disclosed in CN1506385A, ammoniacal liquor, urea or thiourea are used as cosolvents, tertiary amine compounds or aliphatic amine compounds are molecular weight regulators, EDTA is a complexing agent, tertiary amine comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/56C08F4/40C08F4/04C08F2/38
Inventor 翟林峰孙敏王华林方莹绍文丽
Owner HEFEI UNIV OF TECH
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