Cationic degree adjustable dual-function type fine particle used starch flocculant prepared with on-step method and synthesizing method thereof

A cationic degree and dual-action technology, applied in flocculation/sedimentation water/sewage treatment, dehydration/drying/thickened sludge treatment, etc., can solve problems such as difficult industrial scale production, slow flocculant initiation speed, harsh reaction conditions, etc. , to achieve the effects of inhibiting the degree of acidolysis, shortening the flocculation and sedimentation time, and shortening the synthesis time

Inactive Publication Date: 2009-10-07
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the slow initiation speed of the above-mentioned flocculants, the reaction needs to be carried out under a certain temperature and pressure, and it is necessary to further obtain cationic or weakly anionic amphoteric starch-based polymers through amination reaction or Mannich reaction in inverse emulsion. A series of environmentally friendly flocculants, the reaction conditions are harsh, the process is relatively complicated, the production cost is high, and it is difficult to produce on an industrial scale

Method used

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  • Cationic degree adjustable dual-function type fine particle used starch flocculant prepared with on-step method and synthesizing method thereof
  • Cationic degree adjustable dual-function type fine particle used starch flocculant prepared with on-step method and synthesizing method thereof
  • Cationic degree adjustable dual-function type fine particle used starch flocculant prepared with on-step method and synthesizing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Accurately weigh 4.0g of cornstarch (dried at 105°C), dissolve it in 100ml of deionized water, and pour it into a 250ml four-neck bottle (one for agitator, one for a thermometer, one for a nitrogen tube, and one for a condenser). Under nitrogen protection, under the condition of stirring, the water bath was heated to 85°C, kept for 1 hour, and cooled to room temperature after gelatinization. Add 1ml of methacryloyloxyethyltrimethylammonium chloride (80% aqueous solution) and 2ml of dimethyl diallyl ammonium chloride (60% aqueous solution) dropwise into the four-necked bottle respectively, stir well and add propylene Amide 9g, continue stirring with nitrogen gas, dissolve 0.06g of cerium ammonium nitrate in dilute nitric acid solution, add dropwise to the reaction system, adjust the pH of the solution to 5.7, and then keep the temperature for 1 to 3 hours at a reaction temperature of 20 to 35°C. . After the reaction, heat preservation and aging for 2 hours, the product ...

Embodiment 2

[0045] (1) Accurately weigh 16.0g of sweet potato starch (dried at 105°C), dissolve it in 400ml of deionized water, and pour it into a 500ml four-neck bottle (one mouthful for agitator, one mouthful for a thermometer, one mouthful for a nitrogen tube, and one mouthful for a condenser) In the process, under stirring conditions, the water bath was heated to 85°C, kept for 1 hour, cooled to room temperature after gelatinization, and bottled for later use.

[0046] (2) Take 100ml of the gelatinized starch aqueous solution in (1), put it in a 250ml four-necked bottle, stir it to a constant temperature at a temperature of 20-35°C, and blow nitrogen to drive oxygen for 10 minutes, and then pour it into the four-necked bottle respectively Add 1.5ml of methacryloyloxyethyltrimethylammonium chloride (80% aqueous solution) and 2ml of dimethyl diallyl ammonium chloride (60% aqueous solution) dropwise, stir evenly, add 8g of acrylamide, and continue to pass Stir with nitrogen, dissolve 0.1...

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Abstract

The present invention relates to a modified starch flucculant which has an adjustable cationic degree, has dual functions of agglomeration and flocculation and is used for fine particles, and a synthesizing method thereof. The flucculant uses corn, tuber crops and other soluble starch as backing material. Under the function of ammonium ceric nitrate/nitrate initiator, the methacrylatoethyl trimethyl ammonium chloride, dimethyl diallyl ammonium chloride and acrylamide are respectively grafted on the molecular chain of starch through aqueous solution polymerization for synthesizing a cationic degree adjustable dual-function type starch flocculant. The starch flocculant of the invention has the advantages of adjustable cationic degree, capacity for simultaneously exerting the dual functions of charge neutralization and flocculation bridging, simple technique, short reaction period, moderate synthesizing condition and high grafting efficiency. Furthermore the starch flocculant of the invention has the characteristics of high flocculating setting speed, high light transmittance of supernate, degradable capability, low price, innocuity, etc. The starch flucculant can be widely used for the waste water disposal and sludge dewatering with high fine particle content in the industries of papermaking, dyeing and printing, coal floatation, petrifaction, etc.

Description

technical field [0001] The invention belongs to new environment-friendly materials, and relates to a starch flocculant for fine granules with adjustable cation degree and dual-action type and a synthesis method thereof. Specifically, based on corn, potato and other soluble starches, quaternary ammonium salt methacryloyloxyethyl trimethyl ammonium chloride, dimethyl diallyl ammonium chloride and vinyl monomer propylene The amide is a grafted monomer. Under the protection of nitrogen, under the combined action of tetrasodium ethylenediaminetetraacetic acid additive and ammonium cerium nitrate / nitric acid initiator, the cationic degree can be synthesized in one step by aqueous solution polymerization method at normal temperature and pressure. The method of regulating and double-acting fine particles using starch flocculant. Background technique [0002] Natural polymer is an inexhaustible polymer resource endowed by nature to human beings. It can be regenerated and biodegradab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C02F1/56C02F11/14
Inventor 朱书全降林华刘权
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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