Preparation of Amphoteric Polyacrylamide-Grafted Starch Flocculant

Synthesis of amphoteric starch-based grafting flocculants for ...

Abstract An amphoteric starch-graft-polyacrylamide (S-g-PAM) was prepared by inverse emulsion polymerization, subsequent hydrolysis reaction and Mannich reaction. The copolymerization was carried out using ammonium persulfate and urea as redox initiator. The reaction conditions and application as flocculant were investigated.

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Synthesis and application of amphoteric starch graft polymer ...

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... Synthesis, flocculation and adsorption performance of amphoteric starch ...

An anionic polyacrylamide-grafted starch (St-g-APAM) flocculant for the coal slurry waste water, was prepared by using corn starch and acrylamide (AM) as monomers, acrylic acid (AA) as anionic monomer through solution polymerization. The effects of initiator ...

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Advances in synthesis and application of amphoteric polymer- ...

A novel amphoteric polyacrylamide (PDAA) was prepared by inverse emulsion polymerization. The influence of its cationic degree and molecular weight on retention property was discussed. Then, the chemical structure and micromorphology of the obtained PDAA were characterized by Fourier infrared spectrum (FTIR), NMR hydrogen spectrum ( 1 H NMR), gel permeation chromatography (GPC), and scanning ...

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Cationic etherified starch-acrylamide-DMDAAC graft flocculan ...

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Synthesis of amphoteric starch-based grafting flocculants fo ...

A polyacrylamide-grafted starch (St-g-AM-DMC-AMPS) flocculant for the coal slurry wastewater was prepared by using corn starch (St), acrylamide (AM), methyl acryloyloxyethy trimethyl ammonium chloride (DMC) as cationic monomer, 2-acrylamido-2-methyl acrylate sulfonic acid (AMPS) as anionic monomer through solution polymerization. The structure of the synthesized St-g-AM-DMC-AMPS was ...

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Economic and environmentally friendly anionic flocculant syn ...

ABSTRACT Natural starch is a rich polysaccharide biopolymer, which has received more and more attention in the field of water and tailings treatment. However, it has some disadvantages, such as small molecular weight, poor water solubility, and lack of electric charge. Therefore, it is gradually modified to obtain specific properties. Starch-modified flocculant is an environment-friendly ...

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Dual functionality of a graft starch flocculant: Flocculatio ...

Through two-phase aqueous polymerization, amphoteric polyacrylamide (AmPAM) emulsion, as an environmental friendly flocculant for the tannery wastewater, was firstly synthesized using ammonium sulfate aqueous solution as the dispersion, using acrylamide, cationic monomer ethylene methyl propenoyl-trimethylammonium chloride (DMC), and anionic monomer acrylic acid (AA). The structure and ...

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How is amphoteric starch-graft-polyacrylamide (S-G-Pam) prepared?

An amphoteric starch-graft-polyacrylamide (S-g-PAM) was prepared by inverse emulsion polymerization, subsequent hydrolysis reaction and Mannich reaction. The copolymerization was carried out using ammonium persulfate and urea as redox initiator. The reaction conditions and application as flocculant were investigated.

How to obtain stable emulsion of amphoteric starch-graft-polyacrylamide as flocculant?

4. Conclusions A stable emulsion of amphoteric starch-graft-polyacrylamide as flocculant was obtained by inverse emulsion polymerization, hydrolysis reaction and Mannich reaction subsequently. In hydrolysis reaction, both NaOH and Na 2 CO 3 were common hydrolyzing agents.

How is amphoteric starch-graft-polyacrylamide used in amination reaction?

In amination reaction, the amphoteric starch-graft-polyacrylamide with high amination degree and high viscosity was yielded through control of the material addition method and the reaction conditions. The stable emulsion of the amphoteric product could be used directly and there was no need for preparation of a powder.

What is the amination degree of amphoteric S-G-Pam in Mannich reaction?

In Mannich reaction, after pre-formation of an aldehyde–amine adduct was added to the anionic emulsion product, the amination degree of amphoteric S-g-PAM could reach 43.6% and the highest solution viscosity was obtained.

Is amphoteric S-G-Pam better than cationic polyacrylamide?

The application test showed that the results of treatment of several kinds of industrial waste water by amphoteric S-g-PAM were better than those treated with cationic polyacrylamide (PAM), hydrolytic PAM and amphoteric PAM. 1. Introduction Starch is a naturally abundant polysaccharide and a low cost material.

Can sodium carbonate and sodium hydroxide be used as flocculant in hydrolysis reaction?

The reaction conditions and application as flocculant were investigated. Experiments showed that in hydrolysis reaction, a stable emulsion of anionic S-g-PAM with high hydrolysis degree could be obtained in a shorter time when sodium carbonate and sodium hydroxide were used together as hydrolyzing agents.