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Method for preparing high molecular weight anion type polyacrylamide by ultralow-temperature initiation

A polyacrylamide and high molecular weight technology, which is applied in the field of chemical synthesis of water-soluble polyacrylamide polymers, can solve the problems such as difficulty in obtaining high molecular weight polyacrylamide, and achieves overcoming slow heating or uneven heating speed and increased molecular weight. , the effect of improving the overall performance

Inactive Publication Date: 2008-04-09
东营顺通化工(集团)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But no matter what kind of initiation system is used, it is difficult to obtain high molecular weight polyacrylamide by pre-hydrolysis, and the general molecular weight is less than 17 million.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] In a batching kettle with jacket cooling of 15 cubic meters, add 6600kg of 30% acrylamide, 2200kg of pure water, 5kg of urea, 6kg of ammonia water, 400g of disodium edetate, 2,2'-azo (2-amidinopropane) dihydrochloride 320g, 2,2'- azo[2-(2-imidazolin-2-yl) propane] dihydrochloride 320g, 2,2'- azo[2 - Methyl-N-(2-methacrylic acid) propionamide] 160g, feed -10°C chilled water into the jacket to lower the temperature, and adjust the triggering temperature to 3°C. Put the prepared acrylamide solution into the polymerization kettle, pass high-purity nitrogen gas to remove dissolved oxygen in the reaction system, add 120 g of ammonium persulfate after 30 minutes of nitrogen gas flow, add 90 g of sodium bisulfite after 5 minutes, and continue to flow nitrogen gas for 15 minutes After the nitrogen gas was stopped, the temperature of the material in the kettle began to rise. After 2.5 hours, the temperature in the kettle reached 71.3°C. After aging for 1 hour, granulation was car...

Embodiment 2

[0016] In a batching kettle with a jacket cooling of 15 cubic meters, 6600kg of 30% acrylamide, 2200kg of pure water, 5kg of urea, 6kg of ammonia water, 200g of disodium edetate, 2,2'- Nitrogen (2-amidinopropane) dihydrochloride 300g, 2,2'-azo[2-(2-imidazolin-2-yl)propane] dihydrochloride 300g, 2,2'-azo[ 2-Methyl-N-(2-methacrylic acid) propionamide] 150g, through -10°C chilled water in the jacket to lower the temperature, and adjust the triggering temperature to 5°C. Put the prepared acrylamide solution into the polymerization kettle, pass high-purity nitrogen gas to remove dissolved oxygen in the reaction system, add 150 g of ammonium persulfate after passing nitrogen gas for 30 minutes, add 120 g of sodium sulfite after 5 minutes, continue to pass nitrogen gas for 15 minutes, and then stop nitrogen gas , the material in the kettle began to heat up, and the temperature in the kettle reached 73.2°C after 2 hours. After aging for 1 hour, granulation was carried out, and the gra...

Embodiment 3

[0018] In a batching kettle with jacket cooling of 15 cubic meters, 6600kg of 30% acrylamide monomer, 2200kg of deionized water (conductivity≤2.0μs / cm), 5kg of urea, and ammonia water (content of 25-28%) were added under stirring. ) 6kg, disodium edetate 200g, 2,2'-azo(2-amidinopropane) dihydrochloride 300g, 2,2'-azo[2-(2-imidazoline-2- Base) propane] dihydrochloride 300g, 2,2'- azo [2-methyl-N- (2-methacrylic acid) propionamide] 150g, pass through -10 ℃ frozen water in the jacket to cool down, Adjust the initiation temperature to 1.5°C. Put the prepared acrylamide solution into the polymerization kettle, feed high-purity nitrogen (purity ≥ 99.999%) to remove dissolved oxygen in the reaction system, nitrogen flow ≥ 80m 3 / h, 96g of potassium persulfate was added after 30min of nitrogen gas flow, 96g of sodium bisulfite was added after 5min, and nitrogen gas was stopped after 15min of nitrogen gas flow, and the materials in the kettle began to heat up. After 3h, the temperatur...

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Abstract

The present invention provides a preparation method of anionic polyacrylamide with a high molecular weight by ultra-low-temperature initiation, a polynary initiator and a plurality of additives are added in the acrylamide water solution, and high-purity nitrogen is introduced for water solution polymerization. The colloids are carried out the hydrolysis by granulation, adding the hydrolytic agents, mixing and heating after a period of polymerization and aging, after that, the anionic polyacrylamide with a molecular weight of more than 25 million can be generated by granulation, drying, smashing and screening, the present invention has the advantages of smooth polymerization reaction, being conductive to the growth of a chain and the formation of the products with the high molecular weight, overcoming the shortcoming of slow temperature increase or uneven speed of temperature increase of a single azo initiator, low initiation temperature and so on.

Description

Technical field: [0001] The invention belongs to a chemical synthesis method of a water-soluble polyacrylamide polymer, in particular to a method for preparing ultrahigh molecular weight anionic polyacrylamide with a relative molecular weight of more than 25 million. Background technique: [0002] The industrial production of high molecular weight anionic polyacrylamide is relatively mature, but it is still difficult to stabilize the molecular weight of industrial products above 25 million. At present, the production process of anionic polyacrylamide at home and abroad is mainly divided into two methods: pre-hydrolysis and post-hydrolysis: pre-hydrolysis is to add hydrolyzing agents such as sodium carbonate, sodium bicarbonate or sodium hydroxide to the aqueous solution of acrylamide, and pass nitrogen to remove oxygen. The method of adding various auxiliary agents such as an initiator to carry out aqueous solution polymerization, heating and hydrolyzing after the polymeriza...

Claims

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Application Information

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IPC IPC(8): C08F120/56C08F4/40C08F8/12C08F4/04
Inventor 杨振宇
Owner 东营顺通化工(集团)有限公司
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