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Grafted copolymerized cationic polysaccharide bioflocculant and preparation method thereof

A technology of biological flocculant and cationic polysaccharide, applied in the field of graft copolymerization type cationic polysaccharide biological flocculant and its preparation, can solve the problems of inseparability and difficult to compare with adsorption bridging, and achieve high positive charge density and good social Economic benefits, the effect of accelerating the settling rate

Active Publication Date: 2014-11-05
威海汉邦生物环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] From the above examples, it can be seen that the currently researched graft copolymerization cationic modified polymer materials are inseparable from amide groups. Although they have the ability to neutralize negative charges, their properties such as adsorption and bridging are still difficult to compare with those on the market. Comparable to the commonly used polyacrylamide

Method used

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  • Grafted copolymerized cationic polysaccharide bioflocculant and preparation method thereof
  • Grafted copolymerized cationic polysaccharide bioflocculant and preparation method thereof
  • Grafted copolymerized cationic polysaccharide bioflocculant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Nonionic polysaccharide bioflocculants grafted with methacryloyloxyethyltrimethylammonium chloride and acryloyloxyethyltrimethylammonium chloride.

[0033] In a 500ml three-necked flask, add 200g of a nonionic polysaccharide bioflocculant (Dx) solution with a mass concentration of 15%, start stirring, and sequentially add methacryloyloxyethyltrimethylammonium chloride with a mass concentration of 78% ( DMC) solution 50g and acryloyloxyethyl trimethylammonium chloride (DAC) solution 25g with a mass concentration of 80%, after deoxidizing with nitrogen, the temperature was raised to 30°C, and 0.36g of ammonium persulfate was added, and bisulfite was added. Sodium 0.09g, after the reaction for 1h, the temperature was raised to 60°C and 0.09g of dibenzoyl peroxide (BPO) was added. After continuing to stir for 3h, the nitrogen flow was stopped, and air was introduced to terminate the reaction, and the product was precipitated with ethanol. After water extraction and washing,...

Embodiment 2

[0036] Nonionic polysaccharide bioflocculants grafted with dimethylaminoethyl methacrylate and dimethylaminoethyl acrylate.

[0037] In a 500ml three-necked flask, add 200g of nonionic polysaccharide bioflocculant (Dx) solution with a mass concentration of 15%, start stirring, and sequentially add 30g of dimethylaminoethyl methacrylate (DMAEMA) and dimethylaminoethyl acrylate ( DMAEA) 30g, after passing nitrogen to remove oxygen, the temperature was raised to 50 °C, and 0.45g of ceric ammonium nitrate was added. After 8 hours of reaction, nitrogen flow was stopped, air was passed to terminate the reaction, and the product was precipitated with ethanol and extracted with ethanol and water. , After washing, bake in a vacuum drying oven at 50°C to constant weight and grind.

[0038] The results showed that the conversion rate of monomer was 69.5%, the cationic degree was 34.6%, and the flocculation effect was good.

Embodiment 3

[0040] Nonionic polysaccharide bioflocculant grafted with methacryloyloxyethyltrimethylammonium chloride.

[0041]In a 500ml three-necked flask, add 200g of a nonionic polysaccharide bioflocculant (Dx) solution with a mass concentration of 15%, start stirring, and add an aqueous solution containing 60g of methacryloyloxyethyltrimethylammonium chloride (DMC), After deoxidizing with nitrogen, the temperature was raised to 40°C, and 0.45 g of ceric ammonium nitrate was added. After 4 hours of reaction, the nitrogen flow was stopped, air was introduced to terminate the reaction, and the reaction was taken out. The product was precipitated with ethanol, extracted with ethanol and water, and washed at 50 ℃ dried in a vacuum drying oven to constant weight and ground.

[0042] The results showed that the conversion rate of monomer was 62.7%, the cationic degree was 43.53%, and the flocculation effect was obvious.

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Abstract

The invention relates to a grafted copolymerized cationic polysaccharide bioflocculant and a preparing method thereof. A product with the cationic degree (DC) of 3-63% is finally prepared through an aqueous solution polymerization technology with a present nonionic polysaccharide bioflocculant (Dx) as a raw material, one or more of dimethyl diallyl ammonium chloride (DMDAAC), methacryloxyethyltrimethyl ammonium chloride (DMC), acryloyloxyethyltrimethyl ammonium chloride (DAC), dimethylaminoethyl methacrylate (DMAEMA), dimethylaminoethyl acrylate (DMAEA) as a monomer, and one or two of ammonium persulfate / sodium bisulfate and dibenzoyl peroxide (BPO) (AIBA) as an initiator. The preparation method is simple, and is easy to control, and the product obtained in the invention has good flocculation effect and high treatment efficiency, and can be widely used in the field of treatment various sewages, the sludge dewatering field and the like.

Description

technical field [0001] The invention belongs to the technical field of polysaccharide biological flocculant modification technology, in particular to a graft copolymerization type cationic polysaccharide biological flocculant and a preparation method thereof. Background technique [0002] The graft copolymerization cationic bioflocculant is the product of the graft copolymerization of the bioflocculant material and the cationic monomer. It can neutralize and adsorb the particles in the water in the water treatment, and reduce the electrostatic repulsion between the particles. , which is conducive to flocculation. In recent years, there have been many researches on the preparation of water-soluble graft copolymerization cationic bioflocculant materials with great application prospects in papermaking, oil extraction, sewage treatment, etc., such as cationic starch, cationic modified chitosan, etc. The focus of its research is Focus on the selection of cationic monomers, initi...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F2/10C02F1/56
Inventor 庄茅胡阳
Owner 威海汉邦生物环保科技股份有限公司
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