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Preparation method for flocculant starch of grafted acryl oxyethyl trimethyl ammonium chloride

A technology of acryloyloxyethyltrimethylammonium chloride and starch, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., to achieve high production efficiency, reduce production cost, and easy separation

Inactive Publication Date: 2013-07-17
湖北顶新环保新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Most of the reported patents use chemical methods or multi-component copolymerization to prepare flocculated starch grafted with quaternary ammonium salt monomers. 60 Preparation of irradiated starch by Co-γ rays, and then grafting the resulting irradiated starch with DAC to prepare DAC-grafted flocculated starch patents and literature reports

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of flocculated starch grafted with acryloyloxyethyltrimethylammonium chloride, it comprises the steps:

[0024] 1) High-energy irradiation: send cornstarch into 60 Co-γ-ray radiation field, the irradiation condition is aerobic irradiation (i.e. irradiating in atmospheric environment), and the radiation dose is 6KGy, so that described cornstarch produces free radicals, obtains pre-irradiation starch (i.e. pre-irradiation According to cornstarch);

[0025] 2) Spray stirring: according to the addition of acryloyloxyethyltrimethylammonium chloride (DAC) as 50% of the pre-irradiated starch quality, select pre-irradiated starch and acryloyloxyethyltrimethylammonium chloride (DAC); the pre-irradiated starch and acryloyloxyethyltrimethylammonium chloride (DAC) are sprayed and stirred to make them fully mixed and in a semi-dry state to obtain a mixture;

[0026] 3) Carry out grafting reaction in microwave field: place the mixture in microwave field, microw...

Embodiment 2

[0029] A preparation method of flocculated starch grafted with acryloyloxyethyltrimethylammonium chloride, it comprises the steps:

[0030] 1) High-energy irradiation: send tapioca starch into 60 Co-gamma ray radiation field, the irradiation condition is aerobic irradiation (i.e. under atmospheric environment), and radiation dose is 4KGy, makes described tapioca starch produce free radical, obtains pre-irradiation starch (i.e. pre-irradiation tapioca starch );

[0031] 2) Spray stirring: according to the addition of acryloyloxyethyltrimethylammonium chloride (DAC) as 30% of the pre-irradiated starch quality, select pre-irradiated starch and acryloyloxyethyltrimethylammonium chloride (DAC); the pre-irradiated starch and acryloyloxyethyltrimethylammonium chloride (DAC) are sprayed and stirred to make them fully mixed and in a semi-dry state to obtain a mixture;

[0032] 3) Carry out grafting reaction in microwave field: place the mixture in microwave field, microwave treatment...

Embodiment 3

[0035] A preparation method of flocculated starch grafted with acryloyloxyethyltrimethylammonium chloride, it comprises the steps:

[0036] 1) High-energy irradiation: sending sorghum starch into 60 Co-γ-ray radiation field, the irradiation condition is aerobic irradiation (nitrogen-oxygen mixed gas with a volumetric oxygen content of 30%), and the radiation dose is 4KGy, so that the sorghum starch produces free radicals to obtain pre-irradiated starch ;

[0037] 2) Spray stirring: according to the addition of acryloyloxyethyltrimethylammonium chloride (DAC) as 25% of the pre-irradiated starch quality, select pre-irradiated starch and acryloyloxyethyltrimethylammonium chloride (DAC); the pre-irradiated starch and acryloyloxyethyltrimethylammonium chloride (DAC) are sprayed and stirred to make them fully mixed and in a semi-dry state to obtain a mixture;

[0038] 3) Carry out grafting reaction in microwave field: place the mixture in microwave field, microwave intermittently,...

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Abstract

The invention relates to a preparation method for flocculant starch used for waste water treatment. A preparation method for flocculant starch of grafted acryl oxyethyl trimethyl ammonium chloride is characterized by comprising the following steps of: 1) high-energy radiation: feeding the starch into a 60Co-gamma ray radiation field under the radiation condition of aerobic radiation at the radiation dosage being 4 to 10Kgy to obtain pre-radiation starch; 2) spraying stirring: selecting the pre-radiation starch and acryl oxyethyl trimethyl ammonium chloride according to the principle that the addition of the acryl oxyethyl trimethyl ammonium chloride is 25 percent to 50 percent of the mass of the pre-radiation starch and obtaining a mixture through carrying out spraying stirring on the pre-radiation starch and the acryl oxyethyl trimethyl ammonium chloride; and 3) grafting reaction in a microwave filed: placing the mixture into a microwave field, carrying out intermittent microwave treatment for 70s to 3min to obtain grafted starch, crushing the grafted starch and obtaining the flocculant starch of the grafted acryl oxyethyl trimethyl ammonium chloride. The flocculant starch prepared by the method has good flocculation effect and low production cost, and the method has a simple process.

Description

technical field [0001] The invention relates to a preparation method of flocculated starch used for wastewater treatment. Background technique [0002] The pollution of water environment is one of the most prominent environmental threats in our country at present. Wastewater treatment is an important part of environmental governance. Grafted starch flocculant is a graft copolymer of starch and monomer, which has the advantages of good flocculation effect, degradable and cheap raw materials, and is a hot spot of current research. [0003] Related patent research on grafting quaternary ammonium salt monomers on starch. Chinese patent (200610166835.X) uses starch as raw material, 3-chloro-2-hydroxypropyltrimethylammonium chloride or N-(2,3-epoxychloropropyl)trimethylammonium chloride as cationic ether Under the catalysis of sodium hydroxide / co-catalyst composite catalytic system, the cationic starch flocculant with high substitution degree quaternary ammonium is synthesized ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F220/34C08F2/46C02F1/56
Inventor 于伟东汤月华王晓广柯贵珍吴济宏蔡光明石先军
Owner 湖北顶新环保新材料有限公司
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