Method of preparing high molecular weight cationic polyacrylamide

A technology of polyacrylamide and high molecular weight, which is applied in the field of preparation of water-soluble polymer compounds. It can solve the problems of low relative molecular weight and poor solubility of copolymers, and achieve high cationicity and stable polymerization reactions.

Inactive Publication Date: 2008-03-05
大连广汇化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problem that the relative molecular weight of the copolymer is low or the solubility is poor under the redox initiation system, and to provide a cationic polyacrylamide with high molecular weight and good solubility. Preparation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1, add 67.89g of deionized water into the reactor, add 20g of 39.9% acryloyloxyethyltrimethylammonium chloride (DAC), 12g of acrylamide monomer, and then add 0.1g of EDTA under stirring , pyridine 0.002g, boric acid 0.001g, 4,4'-azobis(4-cyanovaleric acid) 0.001g, after stirring evenly, cool down to 30°C, adjust the pH value to 2.5, pass nitrogen to remove oxygen for 30min, add 0.002 g of 10% potassium persulfate was subjected to adiabatic polymerization, and the reaction was completed in about 7 hours to obtain a polymer with a molecular weight of 10.26 million.

Embodiment 2

[0011] Example 2, add 46.43g of deionized water into the reactor, add 39.9% DAC37.6g, 15gAM monomer in sequence under stirring, add OP-100.6g, triethanolamine 0.03g, N-methylolacrylamide 0.01 g, 0.03g of 2,2'-azobis(2-mimidylpropane) dihydrochloride, after stirring evenly, cool down to 20°C, adjust the pH value to 4.0, pass nitrogen to deoxygenate for 30min, add 10% supernatant 0.3 g of sodium sulfate was used for adiabatic polymerization, and the reaction was carried out for about 7 hours to obtain a polymer with a molecular weight of 14.41 million.

Embodiment 3

[0012] Example 3, add 14.82g deionized water into the reactor, add 39.9% DAC70.2g, 12.2g AM monomer successively under stirring, add dodecyl mercaptan 2g, carved white powder 0.08g, boric acid 0.02g, 0.08 g of 2,2'-azobis(2-methylpropylamidine) dihydrochloride, after stirring evenly, cool down to 25°C, adjust the pH value to 5.0, pass nitrogen to remove oxygen for 30 minutes, add 10% supernatant 0.6 g of ammonium sulfate was subjected to adiabatic polymerization for about 7 hours to obtain a polymer with a molecular weight of 5.41 million and insoluble matter.

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PUM

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Abstract

This invention relates to a method to prepare cationic polyacrylamide with high molecular weight. Acrylamide and DAC are adopted as raw materials and aqueous copolymerization takes place in an oxygen-free initiating system with the existence of auxiliary reagents and nitrogen. The auxiliary reagents is one of urea, isopropanol, sodium formate, EDTA, dodecanethiol, OP-10 and polyether AD4074 and weighs 0.5~5% of monomers. The composite initiating system comprises oxidant, reductant, chain extender, and azo compounds, where the oxidant is persulphate weighing 0.001~0.15% of monomers, the reductant is organic amine weighing 0.01~0.20% of monomers, the chain extender weighs 0.01~0.20% of monomers and the azo compounds weigh 0.005~0.20% of monomers. In the end, instant product with high molecular weight and high cation proportion can be obtained.

Description

Technical field: [0001] The invention relates to a preparation method of high-molecular-weight cationic polyacrylamide, which belongs to the preparation of water-soluble high-molecular compounds. Background technique: [0002] Water-soluble high molecular weight cationic polyacrylamide has a wide range of applications in the fields of petroleum, papermaking, sewage treatment and daily chemical industry. Since the 1950s, more in-depth research has been carried out on the copolymerization of cationic monomers and acrylamide (AM) at home and abroad. The cationic monomers are mainly dimethyl diallyl ammonium chloride (DMDAAC for short), formazan Acryloyloxyethyltrimethylammonium chloride (abbreviated as DMC) and acryloyloxyethyltrimethylammonium chloride (abbreviated as DAC), but there are still low molecular weight, poor solubility, and insignificant flocculation effect And so on. For example, some products have good solubility, but the molecular weight is low <10 million,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F2/40
Inventor 程芹孙艳霞车吉泰尹海滨崔祜徽张蕾
Owner 大连广汇化学有限公司
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