Novel Retention Aids for Mechanical Pulps, 1996 Papermakers Conference Proceedings

Acrylamide and poly(ethylene glycol) (PEO) macromonomer copolymers, in conjunction with phenolic formaldehyde resin (PFR), were evaluated as novel retention aids for newsprint pulps. The first-pass retention of the pulp tines was increased from 37 % without polymer to nearly 90 % with copolymer addition. This retention performance was similar to that of the high molecular weight poly(ethylene oxide) (PEO)/phenolic resin dual-polymer systems. However, the copolymers exhibited improved aging resistance and produced a higher fines retention than PEO (MW = 8 million) under high shear stress. The retention performance of the copolymers was very sensitive to the molecular weight. At high molecular weight (e.g. 4.6 million), copolymer with only 0.69 % (mole) of PEO pendant chains as short as 9 repeat units gave 90 % fines retention. A new retention mechanism called complex bridging was proposed to explain the retention effects.

Author: Xiao, H., Hamielec, A., Pelton, R.
Novel Retention Aids for Mechanical Pulps, 1996 Papermakers
Novel Retention Aids for Mechanical Pulps, 1996 Papermakers Conference Proceedings
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