Abstract
Abstract 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 (1H NMR), gel permeation chromatography (GPC), and scanning electron microscope (SEM). Finally, the synergistic retention effects of polydimethyldiallylammonium chloride (PDADMAC), cationic starch (CS), cationic guar gum (CHPG), cationic chitosan (CTS), and polyamine (PA) on the novel PDAA were investigated. The results showed that the optimum cationic degree and molecular weight of PDAA were 25% and 4 million, respectively. The chemical structure of PDAA was confirmed by FTIR, 1H NMR, and GPC. SEM showed that the particle size of PDAA was between 150 and 600 nm, and the particles were very stable because no broken particles were found. In addition, most of the five cationic polymers have good synergistic retention effect on PDAA, and the order of synergistic effect was PDAA/PDADMAC > PDAA/CTS > PDAA/CS > PDAA/CHPG > PDAA/PA.
Highlights
Amphoteric polyacrylamide has both positive and negative charge groups, which has good water solubility.The anion group can protect the cation group and repel the “impurity anion” in the pulp system, so that the cation group will not be reacted or neutralized too early
The polymer prepared by inverse emulsion polymerization has the advantages of fast dissolution and narrow molecular weight distribution (6) and avoids the defects of easy crosslinking and wide molecular weight distribution of products prepared by aqueous polymerization
Many excellent polymers have been prepared by inverse emulsion polymerization
Summary
Amphoteric polyacrylamide has both positive and negative charge groups, which has good water solubility. The surface of the paper pulp fiber is usually negatively charged and easy to adsorb the heterocations in the system, reducing the adsorption with the cation retention aid. Cationic flocculant poly(AM-DMC)) (CPAM) and poly((methacrylic acid)-co-acrylamide) hydrogel nanoparticles crosslinked with methylenebisacrylamide have been prepared successfully via an inverse emulsion polymerization (8,9). This method can be used to prepare paper retention aids (10), wastewater treatment agent (11–13), super absorbent material for paper (14), oil displacement agent (15), and other products (16,17). Preparation of novel amphoteric polyacrylamide and its synergistic retention 163 polymerization and its synergistic retention with other a concentration of 50% was slowly dropped into the fourcationic polymers was investigated.
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