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Flocculation sterilization difunctional grafting starch water treatment agent and preparation method thereof

A water treatment agent and a graft-type technology are applied in the field of flocculation and sterilization bifunctional graft-type starch water treatment agent and its preparation field, achieving the effects of no secondary pollution, improved water solubility, and good salt resistance.

Inactive Publication Date: 2015-07-29
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] At present, there is a lack of a flocculation and sterilization bifunctional grafted amphoteric starch water treatment agent capable of both sterilization and flocculation and its preparation method

Method used

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  • Flocculation sterilization difunctional grafting starch water treatment agent and preparation method thereof
  • Flocculation sterilization difunctional grafting starch water treatment agent and preparation method thereof
  • Flocculation sterilization difunctional grafting starch water treatment agent and preparation method thereof

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preparation example Construction

[0047] A kind of preparation method of flocculation sterilization bifunctional graft type starch water treatment agent of the present invention, comprises the following steps:

[0048] A kind of preparation method of flocculation sterilization bifunctional graft type starch water treatment agent of the present invention, comprises the following steps:

[0049] (1) Preparation of anionic starch: disperse the starch in an ethanol solution with a mass percentage of 1-30% strong alkali, and alkalize it for 0.5-2h at a temperature of 20-50°C; then add chloroacetic acid, starch and chlorine In the etherification reaction of acetic acid, the mass ratio of chloroacetic acid to starch is 0.1:1-3:1, the reaction temperature is 30-80°C, and the reaction time is 0.5-4h; after the reaction is completed, filter and separate to obtain anionic starch;

[0050] (2) Preparation of polyacrylamide grafted anionic starch: in the graft copolymerization reaction, the anionic starch gained in the ste...

Embodiment 1

[0058] A kind of preparation method of flocculation sterilization bifunctional graft type starch water treatment agent of the present invention, comprises the following steps:

[0059] (1) Disperse the starch in 5% sodium hydroxide ethanol solution, alkalinize at 50°C for 1 hour; then, add chloroacetic acid, the mass ratio of chloroacetic acid and starch is 0.5:1, react at 50°C for 4 hours; filter after the reaction is completed , to obtain anionic starch;

[0060] (2) Dissolve the anionic starch in water, prepare a solution with a concentration of 1% by mass of the anionic starch, and after the solution is uniform, add ammonium persulfate as an initiator in an atmosphere of neon gas, and the addition amount is the number of moles of starch units 2%, then add acrylamide, the mass ratio of acrylamide to anionic starch is 5:1, react at 45°C for 4h, then use acetone as a precipitating agent, precipitate and separate the product, and obtain polyacrylamide grafted anionic starch; ...

Embodiment 2

[0071] The difference between embodiment 2 and embodiment 1 is: a kind of preparation method of flocculation sterilization bifunctional graft type starch water treatment agent of the present invention, comprises the following steps:

[0072] (1) Disperse the starch in 1% potassium hydroxide ethanol solution, alkalized at 20°C for 2h; then, add chloroacetic acid, the mass ratio of chloroacetic acid and starch is 0.1:1, react at 30°C for 4h; filter after the reaction is completed , to obtain anionic starch;

[0073] (2) Dissolving anionic starch in water, preparing a solution with a mass percent concentration of anionic starch of 3%, after the solution is uniform, under an argon atmosphere, add potassium persulfate as an initiator, and the amount of potassium persulfate added 1% of the molar number of starch units, then add acrylamide, the mass ratio of acrylamide to anionic starch is 0.5:1, react at 65°C for 1h, then use acetone as a precipitant to precipitate and separate the ...

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Abstract

The invention discloses a flocculation sterilization difunctional grafting starch water treatment agent and a preparation method thereof. The flocculation sterilization difunctional grafting starch water treatment agent is a grafting amphoteric starch water treatment agent which is obtained by virtue of grafting copolymerization and tertiary amination reaction of anionic starch and acrylamide, and the molecular formula of the flocculation sterilization difunctional grafting starch water treatment agent is expressed as follows: (see the specifications), wherein in the grafting amphoteric starch water treatment agent, the substitution ratio of anion groups is 1 to 50 percent, the substitution ratio of cation tertiary amine salt is 5 to 70 percent, and the polyacrylamide accounts for 5 to 80 percent in the grafting amphoteric starch water treatment agent. The preparation method of the flocculation sterilization difunctional grafting starch water treatment agent comprises the following steps: (1) preparing anionic starch; (2) preparing polyacrylamide grafting cation starch; (3) preparing the flocculation sterilization difunctional grafting amphoteric starch water treatment agent. The flocculation sterilization difunctional grafting starch water treatment agent has advantages of excellent flocculation effect and good sterilization performance.

Description

technical field [0001] The invention relates to the field of organic polymers, in particular to a flocculation and sterilization dual-functional grafted starch water treatment agent and a preparation method thereof. Background technique [0002] In recent years, with the rapid economic development and continuous industrial development, water pollution has become increasingly serious; and water is a basic need for human survival. The safety and security of drinking water has already attracted great attention from the country. On July 1, 2007, the newly revised "Drinking Water Sanitation Standard" (GB 5749-2006) was officially implemented, ending the 21-year old standard (GB 5749-1985). The indicators stipulated in the new standard have been greatly increased from the original 35 to 106, and the limits of some indicators are also stricter. In addition, from 2008 to 2011, the state successively released 18 new and more stringent industry emission standards including pulp and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/56C08F8/32C02F1/50C02F1/56C08B31/12
Inventor 杨琥黄牧李爱民
Owner NANJING UNIV
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