Nanocellulose–cationic starch– colloidal silica systems for papermaking:  Effects on process and paper properties, TAPPI Journal October 2022



Application: Papermakers can regard NFC as an option for increasing the bonding strength of the resulting paper beyond what generally can be achieved with conventional wet-end additives. However, as shown in the present work, other additives, such as cationic starch and colloidal silica, may be required at suitable levels of addition to achieve the potential benefits of nanocellulose.

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Author: Larden J. Garland, Brandon D. Leib, Nelson A. Barrios, and Martin A. Hubbe
Nanocellulose•cationic starch• colloidal silica systems for
ABSTRACT: Laboratory tests were conducted to better understand effects on the papermaking process and handsheets when recycled copy paper furnish was treated with combinations of nanofibrillated cellulose (NFC), cationic starch, colloidal silica, and cationic retention aid (cPAM; cationic polyacrylamide). Dosage-response experiments helped to define conditions leading to favorable processing outcomes, including dewatering rates and the efficiency of fine-particle retention during papermaking. Effects were found to depend on the addition amounts of cationic starch and colloidal silica added to the system. It was shown that the presence of a polymer additive such as cationic starch was essential in order to achieve large strength gains with simultaneous usage of NFC.
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