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Preparation method of chitosan grafted copolymer flocculation-bactericide

A technology of graft copolymer and chitosan, which is applied in the field of preparation of chitosan graft copolymer flocculation-bactericide, can solve the problem that flocculation and sterilization cannot be carried out simultaneously, so as to simplify the water purification process and reduce costs , the effect of mild reaction conditions

Inactive Publication Date: 2014-06-18
SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that flocculation and sterilization cannot be carried out simultaneously in the existing water purification process, the present invention provides a preparation method of chitosan graft copolymer flocculation-bactericide, which has both excellent flocculation and strong sterilization performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1 (best embodiment)

[0022] (1) Add chitosan (average molecular weight 380,000, deacetylation degree 63%) into the reactor, add acetic acid aqueous solution, and stir until the chitosan is completely dissolved;

[0023] (2) Add dimethyl diallyl ammonium salt and acrylamide monomer into the reactor according to the molar ratio of chitosan: dimethyl diallyl ammonium salt: acrylamide molar ratio of 1:6:4 , adding water to control the monomer concentration of the reaction system is 40%;

[0024] (3) Control the temperature in the reactor to 60°C, feed nitrogen into the reactor, add 3% total monomer mass initiator potassium persulfate dropwise under the protection of nitrogen, complete the dropwise addition in 1.5 hours, and keep warm for 3 hours;

[0025] (4) Stop heating and pour the reaction product into ethanol, a light yellow to brown solid precipitates out, rinse the solid with a mixed solution of ethanol and water, then dry it in vacuum at 80°C, and grind...

Embodiment 2

[0027] (1) Add chitosan (average molecular weight 250,000, deacetylation degree 60%) into the reactor, add acetic acid aqueous solution, and stir until the chitosan is completely dissolved;

[0028] (2) Add dimethyl diallyl ammonium salt and acrylamide monomer into the reactor according to the ratio of chitosan: dimethyl diallyl ammonium salt: acrylamide molar ratio of 1:4:6 In, adding water to control the reaction system monomer concentration is 40%;

[0029] (3) Control the temperature in the reactor to 75°C, feed nitrogen gas into the reactor, add 5% initiator sodium persulfate dropwise under the protection of nitrogen gas, add dropwise for 1 hour, and keep warm for 5 hours;

[0030] (4) Stop heating and pour the reaction product into ethanol, a light yellow to brown solid precipitates out, rinse the solid with a mixed solution of ethanol and water, then dry it in vacuum at 80°C, and grind it into small particles.

Embodiment 3

[0032] (1) Add chitosan (average molecular weight 500,000, deacetylation degree 42%) into the reactor, add acetic acid aqueous solution, and stir until the chitosan is completely dissolved;

[0033] (2) Add dimethyl diallyl ammonium salt and acrylamide monomer to the reactor according to the ratio of chitosan: dimethyl diallyl ammonium salt: acrylamide molar ratio of 1:3:8 In, adding water to control the reaction system monomer concentration is 50%;

[0034] (3) Control the temperature in the reactor to 65°C, feed nitrogen into the reactor, add 7% total monomer mass initiator potassium persulfate dropwise under the protection of nitrogen, finish adding dropwise in 2 hours, and keep warm for 4 hours;

[0035] (4) Stop heating and pour the reaction product into ethanol, a light yellow to brown solid precipitates out, rinse the solid with a mixed solution of ethanol and water, then dry it in vacuum at 80°C, and grind it into small particles.

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PUM

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Abstract

The invention provides a chitosan grafted copolymer flocculation-bactericide for treating water bodies such as circulating cooling water, papermaking sewage, printing and dyeing sewage, domestic sewage, drilling fluid and the like. The bactericide is a compound agent which can kill the plankton such as viruses, bacteria, algae and the like in the water body and settles along with the colloid and suspended particles in the water body. The bactericide provided by the invention is prepared by graft copolymerization of chitosan and dimethyl diallyl ammonium salt and acrylamide triggered under the nitrogen protection.

Description

technical field [0001] The invention belongs to the field of water treatment chemicals and provides a preparation method of a chitosan graft copolymer flocculation-bactericide. Background technique [0002] Chemical flocculation is a common and important method to treat some industrial and domestic sewage such as papermaking, sugar refining, printing and dyeing, and oil exploitation. Commonly used flocculants include inorganic flocculants based on aluminum sulfate, aluminum chloride, ferric sulfate, ferric chloride and their polymers, organic polymer flocculants such as polyacrylamide and quaternary ammonium salts, and microbial flocculants. The colloid and suspended particles in the water can be flocculated and settled effectively by adding flocculants in the sewage system. There are many reasons for water pollution and turbidity, such as organic particles, oil, microorganisms, inorganic colloids, etc. in industrial production. Chemical flocculants can effectively floccul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/56C08F226/02C02F1/50C02F1/56
Inventor 张秀华刘全华万振涛齐晓婧李鹏飞周靖仁
Owner SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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