Use of New Branched Cationic Polyacrylamides to Improve
Use of New Branched Cationic Polyacrylamides to Improve Retention and Drainage in Papermaking
Use of New Branched Cationic Polyacrylamides to Improve Retention and Drainage in Papermaking By Elisabete Antunes, Fernando A. P. Garcia, Paulo Ferreira, Angeles Blanco, Carlos Negro and M. Graça Rasteiro
Use of New Branched Cationic Polyacrylamides to Improve
Use of New Branched Cationic Polyacrylamides to Improve Retention and Drainage in Papermaking Elisabete Antunes, †Fernando A. P. Garcia,‡ Paulo Ferreira, Angeles Blanco,§ Carlos Negro,§ and M. Grac¸a Rasteiro*,† Research Centre for Chemical Processes Engineering and Forest Products, Chemical Engineering Department,
The effect of the contact time between cationic polymers (polyacrylamides and cationic starches) and stock on retention and dewatering has been studied using a new type of equipment.
Use of new branched polyacrylamides to improve retention
The effect of the contact time between cationic polymers (polyacrylamides and cationic starches) and stock on retention and dewatering has been studied using a new type of equipment.
In papermaking, mill water closure may result in a significant increase of inorganic salts in the white water. The effect of these contaminants on the performance of retention aids was evaluated, in this study, through flocculation of Precipitated Calcium Carbonate with three very high molecular weight cationic polyacrylamides of medium charge density and with different degrees of branching.
Cationic cellulosic derivatives as flocculants
The flocculant with the highest degree of polymerization and charge originated the best results, particularly when the filler used was kaolin, proving that water-soluble cationic cellulose derivatives can aid in the flocculation of fillers used in papermaking. On the contrary, the shortest-chained derivative was not effective.
Starlike branched polyacrylamides (SB-PAMs) were synthesized using reversible addition–fragmentation chain transfer copolymerization of acrylamide (AM) and N,N′-methylenebis(acrylamide) (BisAM) in the presence of 3-(((benzylthio) carbonothioyl)thio)propanoic acid as a chain transfer agent, followed by chain extension with AM.The amount of incorporated BisAM in the core and the amount of AM
1. Introduction
1 American Water Works Association Water Quality and Treatment—A Handbook of Community Water Supplies 1999 5th New York, NJ, USA John Wiley & Sons 11 Antunes E. Garcia F. A. P. Ferreira P. Use of new branched cationic polyacrylamides to improve retention and drainage in papermaking Industrial & Engineering Chemistry Research 2008 47 9370
Cationic and highly branched poly (trimethylphosphonium ethylacrylate‐co‐poly (ethylene glycol) acrylate) (p (TMPEA‐co‐PEGA)), and its ammonium equivalent, have been synthesised from post‐polymerisation modification of a poly (bromo ethylacrylate‐co‐poly (ethylene glycol) acrylate) (p (BEA‐co‐PEGA)) precursor polymer produced using reversible addition fragmentation chain
Preparation, application, and mechanism of starch modified
Recovered paper can increase the content of fine fibers. The most common and effective solution to the modern paper industry is to offer retention and drainage aids to the wet end (Gill 1991). “Use of new branched cationic polyacrylamides to improve retention and drainage in papermaking,
The cationic polyacrylamides (FO) are copolymer of acrylamide (Figure 1(a)) and N,N,N-trimethyl aminoethyl chloride acrylate (Figure 1(c)) with different charge densities and different molecular weights. Table 1 lists the charge densities and molecular weights for all polymers used in this study. Charge density of a polymer is the percentage of
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