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Cellulose

, Volume 26, Issue 10, pp 6275–6289 | Cite as

Hairy cationic nanocrystalline cellulose as retention additive in recycled paper

  • Cristina Campano
  • Patricio Lopez-Exposito
  • Angeles BlancoEmail author
  • Carlos Negro
  • Theo G. M. van de Ven
Original Research
  • 33 Downloads

Abstract

Hairy cellulose nanocrystalloids (HNC) are a brand new family of nanocellulose characterized by having functionalized amorphous poles joined by a crystalline shaft. In this paper we hypothesize that cationic HNC (CNCC) could be used as an effective retention agent in papermaking. To investigate this, we first flocculated a suspension of only fillers, namely kaolinite and CaCO3, and second, a suspension of recycled fibers, with CNCC. It was monitored by photometric dispersion analysis and laser focused beam reflectance. The flocculation mechanism was assessed by means of zeta potential, reflocculation efficiency, flocculation stability and optical microscopy. Finally, the effect of CNCC on drainage, retention and paper mechanical properties was studied. CNCC were found to heteroflocculate fillers at a wide range of dosages, finding a maximum floc size at a dosage of 30 mg/g. On the other hand, the maximum floc size when flocculating the pulp suspension, was found at a lower CNCC dosage (20 mg/g). In this case, fillers were being attached to the exterior surface of the fibers. In both systems, the maximum size increment was observed at the isoelectric point, so a charge neutralization mechanism was proposed. The addition of CNCC not only improved filler retention, but also pulp drainage by reducing these times. Moreover, although mechanical properties of the handsheets were affected by the presence of CNCC, this effect was much lighter than that caused by traditionally used retention systems. Hence, CNCC could replace many additives used in the wet-end of a paper machine, thus simplifying its operation.

Graphical abstract

Keywords

Hairy cationic nanocrystalline cellulose Recycled paper Retention system Fillers flocculation Drainage and retention Fibers flocculation 

Notes

Acknowledgments

Authors thank the Spanish Ministry of Economy and Competitiveness for the funding of the projects (Ref. CTQ2013-48090-C2-1-R and CTQ2017-85654-C2-2-R), the grant of C. Campano (BES-2014-068177) and the mobility funding (EEBB-I-17-12595); and the Community of Madrid for funding the RETO-PROSOST-CM (S2013/MAE-2907). Theo van de Ven acknowledges support of a NSERC Discovery grant (42686-13).

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Department of Chemical EngineeringComplutense University of MadridMadridSpain
  2. 2.Department of Chemistry, Pulp and Paper Research Centre, and Quebec Centre for Advances MaterialsMcGill UniversityMontrealCanada

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