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Preparation method of extra high molecular cation polyacrylamide

A polyacrylamide and ultra-high molecular technology, applied in the chemical industry, can solve the problems of unstable product quality, serious molecular weight degradation, and high content of insoluble matter, achieve deodorization and elimination of bacterial harmful substances, small molecular weight degradation, and good solubility Effect

Inactive Publication Date: 2006-08-30
JIANGDU CITY CHEM PLANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The materials are placed in the tray and enter the oven in layers, and are dried with hot air. Because the materials are statically bonded to each other, the molecular weight is seriously degraded. Due to the local heating, the product has poor solubility and high insoluble content, resulting in long polymerization cycle and high drying energy consumption. The output is small and the product quality is not stable enough

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] With 391kg (concentration: 26%) of acrylamide aqueous solution refined by ion exchange resin, and 254kg (concentration: 78%) of methacryloyloxyethyltrimethyl ammonium chloride after extracting by acetate solvent, no Add 355kg of ionized water into the polymerization kettle, adjust the initial temperature to 18°C, add 0.024% disodium edetate, 0.024% sodium formate, β-dimethylaminopropyl Nitrile 0.2%, ethylenediamine 0.12%, after passing through high-purity nitrogen for deoxygenation for 30 minutes, add ammonium persulfate 0.01%, sodium bisulfite 0.01%, 2,2'-azo(2-amidinopropane) di Hydrochloride 0.05%, continue to pass nitrogen for 10 minutes, close all valves, carry out polymerization reaction for 4 hours, when the reaction no longer heats up, carry out heat preservation for 2 hours, press out the colloid with 0.3mpa compressed air for coarse granulation, special The granulator is used to granulate to obtain granule colloids with a particle size of 0.4 mm, which are pro...

Embodiment 2

[0025] 395kg of acrylamide aqueous solution (concentration: 27%), 248kg of acryloxyethyltrimethylammonium chloride (concentration: 78%), and 357kg of deionized water are added to the polymerization kettle, additives and initiators are added, and the process is the same as Example 1. Its product performance indicators: molecular weight 24.8 million, solid content 91%, dissolution speed 27 minutes, residual monomer < 0.1%.

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Abstract

The present invention relates to an extra-high molecular cation polyacrylamide preparation method. Said preparation method includes the steps of copolymerization of acrylamide and ammonium (methyl) acryloyloxyethyltrimethyl chloride aqueous solution, monomer refinery, purification, adding multicomponent initiator and additive, polymerization, heat-insulating, granulating, drying, pulverizing and sieving so as to obtain the invented extra-high molecular cation polyacrylamide whose molecular weight is 23000000 and dissolving speed is less than or equal to 30min. The invented product can be used as water-purifying agent for treating waste water and sewage in the several extensive fields.

Description

Technical field: [0001] The invention relates to a method for preparing ultra-high molecular weight cationic polyacrylamide, which belongs to the technical field of chemical industry Background technique: [0002] At present, the commercially available cationic polyacrylamide has a molecular weight of 5-10 million, a dissolution rate of 1-3 hours, and a high content of residual monomers and insolubles. Its preparation method is to mix acrylamide and cationic monomers in different proportions. Generally, the aqueous solution copolymerization method is adopted. Nitrogen gas is introduced into the system to remove oxygen, and an oxidation-reducing agent (persulfate-sodium sulfite or ferrous sulfate) is added. The water-soluble azo salt that initiates in the high temperature stage generally has a polymerization concentration of 40%. The polymerization is initiated at a temperature of 30-40°C. The process equipment used is box type or sheet polymerization, and heat preservation i...

Claims

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Application Information

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IPC IPC(8): C08F20/56C08F2/10
Inventor 陶有和
Owner JIANGDU CITY CHEM PLANT
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