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High molecular weight cationic polyacrylamide preparation method

A polyacrylamide, cationic technology, applied in the field of preparation of cationic polyacrylamide, can solve the problems of difficult to obtain cationic polyacrylamide, poor efficiency, difficult cationic polyacrylamide, etc.

Inactive Publication Date: 2010-01-20
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to obtain high-molecular-weight cationic polyacrylamide by the reverse-phase suspension polymerization method used in the past. One of the reasons is that usually a single initiator is used in this type of polymerization reaction, and the concentration of the initiator used is high, and the efficiency is not good enough, so it is difficult to obtain High molecular weight cationic polyacrylamide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Add 319.2 grams of cyclohexane in a four-necked round-bottom flask with a capacity of 1 liter that is equipped with a stirrer, a reflux cooler, a thermometer, and a nitrogen inlet pipe, and then add 12.6 grams of sorbitol monostearate of HLB=4.7 therein Ester Surfactant, the temperature was raised to 70°C under a nitrogen atmosphere. In a 500-milliliter Erlenmeyer flask, adding 150.5 grams of methacryloyloxyethyltrimethylammonium chloride (DMC) at a concentration of 78 wt% and 117.2 grams of acrylamide aqueous solution at a concentration of 33 wt% (mass ratio DMC: AM =3: 1), then add 5 grams of aqueous solution containing 0.1 gram of ammonium persulfate and 0.1 gram of V50 composite initiator to it. The contents of the 500 ml flask were added to the contents of the four-necked round-bottom flask, and stirred to suspend. Polymerization started at this point, reached a peak at about 73°C, and was then held at 70°C for 1 hour. Stop stirring after the reaction, and the we...

Embodiment 2

[0043] Use 100.2 grams of 50% acryloxyethyltrimethylammonium chloride (DAC) and 167 grams of concentration instead as 30% acrylamide aqueous solution, add 5 grams of aqueous solution containing 0.1 gram of V44 and 0.1 gram of V50 composite initiator, other The conditions are the same as in Example 1. After the polymerization, the polymer is separated and dried to obtain a cationic polyacrylamide granular solid with a particle size of about 280nm, an intrinsic viscosity of 6.8dl / g, a cationic degree of 48.5%, and a solid content of 88.9%.

Embodiment 3

[0045] Except that the initiator is changed to 5 grams of aqueous solution of 0.1 gram of V44 and 0.1 gram of V501 composite initiator, other conditions are the same as in Example 1, and the particle diameter is about 350nm cationic polyacrylamide granular solid, and the intrinsic viscosity is 7.6dl / g, cationic degree 65.5%, solid content 88.8%.

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Abstract

The invention discloses a high molecular weight cationic polyacrylamide preparation method and the method adopts the inverse suspension polymerization method. The invention is characterized in that the method comprises the following steps: mixing acrylamide, cationic ethyl monomer and composite initiator evenly to form the dispersed phase, adding the dispersed phase in oil-soluble dispersion medium under a certain temperature to disperse to aqueous phase droplets under the action of suspension dispersant and to initiate the polymerization; and after finishing the reaction, obtaining the bead product of high molecular weight cationic polyacrylamide by filtrating and drying the suspension. The invention adopts inverse suspension polymerization method so that the polymerization can be performed steadily at a certain temperature, thus benefiting the chain propagation and providing conditions for the preparation of high molecular weight cationic polyacrylamide; better polymerization effect can be realized by selecting proper composite initiator and using a small amount of initiator so that the high molecular weight product can be obtained and the intrinsic viscosity of the product is not less than 6.0dl / g.

Description

technical field [0001] The invention relates to a preparation method of cationic polyacrylamide, which belongs to the preparation of water-soluble polymer compounds. Background technique [0002] Polyacrylamide and its copolymers are important flocculants, widely used in urban sewage and industrial wastewater treatment. Polyacrylamide can be divided into non-ionic, anionic, cationic and zwitterionic according to its ionic properties. Among them, cationic polyacrylamide is an effective flocculant for sewage treatment. As a flocculant, cationic polyacrylamide is mainly used in industrial solid-liquid separation processes, including sedimentation, clarification, concentration and sludge dewatering. The main industries used are: urban sewage treatment, paper industry, food processing industry, Wastewater treatment in petrochemical, metallurgy, mineral processing, dyeing and other industries. It is used in sludge precipitation and sludge dehydration in the process of urban sew...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/34C08F220/56C08F226/02C08F2/32
Inventor 朱宏
Owner SOUTH CHINA NORMAL UNIVERSITY
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