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Ampholytic modified grafted starch flocculant

A technology of graft modification and flocculant, which is applied in the field of amphoteric graft modified starch flocculant

Inactive Publication Date: 2011-11-23
何善媛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ecological safety problems of most traditional flocculant products in the existing market in water treatment and the resulting secondary pollution restrict the in-depth development of flocculants in water treatment fields such as water purification and sewage recycling.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Take 5 grams of starch that has been dried at 105°C, add 100ml of deionized water into a 250ml three-neck bottle, stir, under nitrogen protection, heat in a water bath to 85-95°C, keep warm for 1 hour, gelatinize and cool to room temperature;

[0027] (2) Add 3.5g of methacrylic acid dropwise to the three-necked flask, stir for 10 minutes, add 6ml of potassium persulfate / sodium bisulfite mixed solution dropwise, adjust the pH of the solution to 8, then raise the temperature to 55-65°C, and keep warm for reaction 1 hour;

[0028] (3) According to the same method as step (2), add 5 g of cationic monomer acryloyloxyethyltrimethylammonium chloride dropwise and at the same time add 3 ml of potassium persulfate / sodium bisulfite mixed solution, at 55-65 ℃ heat preservation reaction for 3 hours to finally obtain the amphoteric graft modified starch flocculant;

[0029] (4) After the reaction, cool down to room temperature, wash with water, and dry to obtain the amphoteric...

Embodiment 2

[0031] (1) Take 5 grams of starch that has been dried at 105°C, add 100ml of deionized water into a 250ml three-neck bottle, stir, under nitrogen protection, heat in a water bath to 85-95°C, keep warm for 1 hour, gelatinize and cool to room temperature;

[0032] (2) Add 0.25 g of acrylic acid dropwise to the three-necked flask, stir for 10 minutes, and then add 6 ml of potassium persulfate solution dropwise. Adjust the pH of the solution to 7.5, then raise the temperature to 65°C, and keep it warm for 1 hour;

[0033] (3) According to the same method as step (2), add 0.25 g of cationic monomer dimethyl diallyl ammonium chloride dropwise and add 3 ml of potassium persulfate solution at the same time, and keep it at 65 ° C for 3 hours to obtain amphoteric Graft modified starch flocculant;

[0034] (4) After the reaction, cool down to room temperature, wash with water, and dry to obtain the amphoteric starch grafted flocculant.

Embodiment 3

[0036] (1) Take 5 grams of starch that has been dried at 105°C, add 100ml of deionized water into a 250ml three-neck bottle, stir, under nitrogen protection, heat in a water bath to 85-95°C, keep warm for 1 hour, gelatinize and cool to room temperature;

[0037] (2) Add 15 g of dimethylaminoethyl methacrylate dropwise into the three-necked flask, stir for 10 minutes, and then add 6 ml of sodium bisulfite mixed solution dropwise. Adjust the pH of the solution to 8, then raise the temperature to 65°C, and keep it warm for 1 hour;

[0038] (3) According to the same method as step (2), add 5 g of cationic monomer acryloyloxyethyltrimethylammonium chloride dropwise and add 3 ml of sodium bisulfite mixed solution at the same time, keep the reaction at 65 ° C for 3 hours and finally Obtain amphoteric graft modified starch flocculant;

[0039] (4) After the reaction, cool down to room temperature, wash with water, and dry to obtain the amphoteric starch grafted flocculant.

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Abstract

The invention discloses an ampholytic modified grafted starch flocculant. The flocculant is characterized in that the preparation method comprises the following steps: under the action of an initiator, starch is used to perform a grafting reaction with an acrylic or vinyl sulfonate monomer the mass of which is 0.05-5 times that of starch to obtain an anionic starch graft polymer, and then the anionic starch graft polymer reacts with a cationic monomer the mass of which is 0.05-5 times that of starch to prepare the flocculant. The ampholytic modified grafted starch flocculant not only has the functions of coagulation and flocculation, but also has the decoloring effect and can be widely used in the industries such as petroleum, coal, sewage treatment, sludge dehydration and papermaking. In addition, the preparation method of the flocculant has the advantages of simple method, high productivity and the like.

Description

technical field [0001] The invention relates to the field of flocculants, in particular to an amphoteric graft modified starch flocculant. Background technique [0002] Flocculants are currently the most widely used and used products in the technical fields of water industry, sewage treatment and water conservation, and sewage harmless and resourceful treatment. With the extensive use of flocculants in the field of water treatment, the ecological safety and secondary pollution of flocculants have attracted more and more attention. The residual aluminum toxicity in water treated with inorganic aluminum salt flocculants not only directly affects animals, plants, aquatic organisms, and microorganisms, but also can further affect human health through the food chain. Polyacrylamide organic polymer flocculants are used in the production, use and sludge. The ecological security shown in the follow-up process has attracted more and more attention. The ecological safety problems o...

Claims

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Application Information

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IPC IPC(8): C08F285/00C08F251/00C02F1/56
Inventor 何善媛
Owner 何善媛
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