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Preparation method of cationic starch graft copolymer flocculant

A cationic flocculant and starch grafting technology, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of low content of cationic structural units, unsatisfactory flocculation effect, low degree of cationization, etc., and achieve coarse flocs and sedimentation Fast speed and small dosage effect

Active Publication Date: 2011-05-04
科凯精细化工(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method adopts the inverse emulsion method, in the process of copolymerization, acrylamide and its cationic derivatives are all put into the reactor for reaction at the same time. Since the reactivity rate of the cationic monomer is much lower than that of acrylamide, the cationic The content of structural units is very small, the degree of cationization is low, and the product has large heterogeneity, so the flocculation effect of the obtained product is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (a) Weigh 17g of cornstarch, 16g of dimethylaminoethyl acrylate chloride methane salt and 2g of acrylamide and mix them with 35ml of water to form a dispersion system with a solid content of 50%, and stir for 30 minutes at room temperature, To obtain the aqueous phase mixture;

[0019] (b) In a four-neck flask equipped with a stirrer, a thermometer, and a reflux condenser, first add 60ml of liquid paraffin oil, then add Span802.8g and Tween800.16g, stir, and gradually heat up to 50°C within 40 minutes to obtain a uniform Phase response system;

[0020] (c) Add the water phase mixture obtained in step a to the oil phase, stir for 30-60 minutes to form a stable emulsion, then add 0.075g of ammonium persulfate dissolved in 2ml of water and 0.075g of ammonium persulfate dissolved in 2ml of water under nitrogen protection conditions 0.03g of urea, after 10-30 minutes, pour 2g of acrylamide dissolved in 5ml of water, continue to stir and react for 3.5 hours, then stop the ni...

Embodiment 2

[0024] (a) Weigh 15g of tapioca starch, 13g of dimethylaminoethyl acrylate chloride methane salt and 3g of acrylamide and mix them with 30ml of water to form a dispersion system with a solid content of 51%, and stir for 40 minutes at room temperature, To obtain the aqueous phase mixture;

[0025] (b) In a four-neck flask with a stirrer, a thermometer and a reflux condenser, first add 60ml of liquid paraffin oil, then add 2.8g of Span80 and 0.16g of Tween80, stir, and gradually heat up to 45°C within 30 minutes to obtain a homogeneous Phase response system;

[0026] (c) Add the water phase mixture obtained in step a to the oil phase, stir for 30-60 minutes to form a stable emulsion, then add 0.075g of ammonium persulfate dissolved in 2ml of water and 0.075g of ammonium persulfate dissolved in 2ml of water under nitrogen protection conditions 0.03g of urea, after 10-30 minutes, pour 2g of acrylamide dissolved in 5ml of water, continue to stir and react for 3.5 hours, stop the n...

Embodiment 3

[0030] (a) Weigh 18g of cornstarch, 16g of epoxypropyltrimethylammonium chloride and 4g of acrylamide and mix them with 30ml of water to form a dispersion system with a solid content of 56%, and stir for 40 minutes at room temperature , to obtain the aqueous phase mixture;

[0031] (b) In a four-neck flask equipped with a stirrer, a thermometer, and a reflux condenser, first add 60ml of liquid paraffin oil, then add Span803.0g, stir, and gradually heat up to 45°C within 30 minutes to obtain a homogeneous reaction system;

[0032] (c) Add the water phase mixture obtained in step a to the oil phase, stir for 30-60 minutes to form a stable emulsion, then add 0.08g of ammonium persulfate dissolved in 2ml of water and 0.08g of ammonium persulfate dissolved in 2ml of water under nitrogen protection conditions 0.04g of sodium sulfite, after 10-30 minutes, pour 1.5g of acrylamide dissolved in 4ml of water, continue to stir and react for 3 hours, stop the nitrogen protection, cool, add...

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Abstract

The invention relates to a preparation method of cationic starch graft copolymer flocculant, belonging to the technical field of preparation technique of natural organic polymer flocculant. The method has the main characteristic of adopting a step-by-step feeding method which comprises the steps of: dissolving starch, part of nonionic monomer and cationic monomer in deionized water in advance; then, mixing the solution with oil phase mixture formed by oil phase solvent and emulsifying agent; stirring for 30-60min, and forming stable emulsion; after that, adding initiating agent and carrying out graft polymerization reaction under the nitrogen protection; after reacting for a period of time, adding the rest nonionic monomer into the reaction system for continuous reaction, and finally obtaining the cationic starch graft copolymer flocculant. The obtained product can be applied to sewage treatment, and has the advantages of high efficiency, little dosage, thick flocculant body, rapid settling velocity and the like.

Description

technical field [0001] The invention relates to a preparation method of a starch graft copolymerization cationic flocculant, which belongs to the technical field of natural organic polymer flocculant preparation technology. Background technique [0002] Starch is an important raw material. It has the characteristics of wide sources, low price, and the product is completely biodegradable, which can form a virtuous cycle in nature. However, the original starch has insurmountable shortcomings such as insolubility in cold water and poor flocculation performance. , so we often have to modify the starch before it can be used. [0003] Among them, modified starch can be used as a flocculant for water treatment, especially cationic starch. In the foreign water treatment agent market, there are also many modified starch flocculant products, such as Aerofloc produced by American Ammonia Corporation, Zfloc-Aid, starches613-45 and Zyorkshiree produced by National Starch Corporation, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08B31/12C08F2/32C02F1/56
Inventor 俞成丙赵秀兰张云吕希林
Owner 科凯精细化工(上海)有限公司
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