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Preparation method of starch-grafted dicyandiamide formaldehyde polycondensate flocculants

A technology of dicyandiamide formaldehyde and starch grafting, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of poor storage stability, small molecular weight, and low starch content, achieve excellent storage stability, and facilitate subsequent industrial application Effect

Inactive Publication Date: 2013-01-09
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dicyandiamide-formaldehyde polycondensate flocculant prepared by the traditional process has the disadvantages of poor storage stability, small molecular weight, and high cost of use.
[0005] At present, the preparation method of starch-grafted dicyandiamide-formaldehyde polycondensate flocculant is generally to directly mix the dicyandiamide-formaldehyde polycondensate flocculant and starch, and use the methylol group on the molecular chain of dicyandiamide-formaldehyde polycondensate to react with starch molecules. However, the starch-grafted dicyandiamide-formaldehyde polycondensate flocculant prepared by this method has less starch content and poor treatment effect.

Method used

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  • Preparation method of starch-grafted dicyandiamide formaldehyde polycondensate flocculants
  • Preparation method of starch-grafted dicyandiamide formaldehyde polycondensate flocculants

Examples

Experimental program
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Effect test

Embodiment 1

[0018] (1) Take 32.4g of formaldehyde and 10.7g of ammonium chloride in a 250ml four-neck flask, heat and react in a water bath at 70°C for half an hour, then add 16.8g of dicyandiamide and 1.4g of acrylamide, and stir and react at 70°C for 2 hours, After cooling a cationic polymer containing C=C double bonds is obtained.

[0019] (2) Take 10g of starch and 90g of deionized water in a 250ml four-neck flask, heat it in a water bath at 80°C to fully gelatinize the starch, add a certain amount of ammonium cerium nitrate initiator (concentration 1.0×10 -3 mol / L), add 40g cationic polymers containing C=C double bonds after reacting under nitrogen for half an hour, and cool in a water bath to obtain a novel starch-grafted dicyandiamide-formaldehyde polycondensate flocculant product after 2 hours of reaction.

Embodiment 2

[0021] (1) Take 24.3g of formaldehyde and 10.7g of ammonium chloride in a 250ml four-necked flask and heat it in a 70°C water bath for half an hour, then add 16.8g of dicyandiamide, 1.4g of acrylamide and a small amount of formaldehyde, and stir the reaction at 70°C After cooling for 2 hours, a cationic polymer containing C=C double bonds was obtained.

[0022] (2) Take 10g of starch and 90g of deionized water in a 250ml four-neck flask, heat in a water bath at 80°C to fully gelatinize the starch, and add potassium persulfate initiator (concentration 2.5×10 -3 mol / L), add 40g cationic polymers containing C=C double bonds after reacting under nitrogen for half an hour, and cool in a water bath to obtain a novel starch-grafted dicyandiamide-formaldehyde polycondensate flocculant product after 2 hours of reaction.

Embodiment 3

[0024] (1) Take 35.6g of formaldehyde and 10.7g of ammonium chloride in a 250ml four-neck flask, heat and react in a water bath at 70°C for half an hour, then add 16.8g of dicyandiamide and 0.7g of acrylamide, and stir and react at 70°C for 2 hours, After cooling a cationic polymer containing C=C double bonds is obtained.

[0025] (2) Take 5g of starch and 95g of deionized water in a 250ml four-necked flask, heat it in a water bath at 85°C to fully gelatinize the starch, add 0.5g of potassium permanganate initiator after cooling down to 70°C, and react halfway under nitrogen. Add 20 g of cationic polymers containing C=C double bonds after 1 hour, heat and react in a water bath for 2.5 hours, then cool to obtain a novel starch-grafted dicyandiamide-formaldehyde polycondensate flocculant product.

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Abstract

The invention discloses a preparation method of starch-grafted dicyandiamide formaldehyde polycondensate flocculants. The preparation method includes the steps: (1) adding formaldehyde and ammonium chloride in a reaction kettle to react for 0.5-1.0h at the temperature of 40-80 DEG C, then adding dicyandiamide to react for 1.0-2.0h, and adding acrylamide and the formaldehyde to react for 0.5-2.0h so that a cationic polymer including C=C double bonds is obtained; and (2) taking, by weight, 5-10 parts of starch, 5-15 parts of the cationic polymer including the C=C double bonds prepared in the step (1), 0.01-1.0 part of initiators and 75-90 parts of deionized water to react for 1-4h in the presence of nitrogen gas at the temperature of 70-85 DEG C. The flocculants prepared by the preparation method are good in decoloring flocculation effect, less in consumption and low in cost and is suitable for flocculating decoloration of industrial sewage such as printing and dyeing and papermaking and urban sewage.

Description

technical field [0001] The invention relates to a preparation method of a novel starch-grafted dicyandiamide-formaldehyde condensation polymer flocculant, which belongs to the water treatment industry. Background technique [0002] Flocculants are the most widely used and used products in the field of wastewater treatment. Due to the problems of environmental safety and secondary pollution in inorganic aluminum salt flocculants and polyacrylamide organic macromolecular flocculants, they are efficient, cheap and ecologically safe. Pollution-free flocculants have become a hot spot in research and development in the field of water treatment. [0003] Starch has a wide range of sources, is cheap and biodegradable, and can form a virtuous cycle in nature. Therefore, grafted starch as a flocculant combines the properties of natural polymers and organic synthetic polymers, and has the advantages of high efficiency, low price and environmental protection. [0004] Dicyandiamide for...

Claims

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Application Information

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IPC IPC(8): C02F1/56C08F299/02C08G12/22C08G12/16
Inventor 张恒蓝惠霞张岩冲
Owner QINGDAO UNIV OF SCI & TECH
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