preparation of amphoteric polyacrylamide-grafted starch in brazil

preparation of amphoteric polyacrylamide-grafted starch in brazil
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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 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.
  • 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 to synthesize amphoteric polyacrylamide flocculants?
  • Copolymerization of AM with various functional monomers or betaine-based monomers is also a general way to synthesize amphoteric polyacrylamide flocculants. Zhu et al. used amphoteric polyacrylamide (AmPAM) obtained by the copolymerization of AM, AA and methyl acrylic acid ethyl trimethyl chloride ammonium for treating tannery wastewater [ 77 ].