Hydroxyalkylated xylans – Their synthesis and application in coatings for packaging and paper

► Pure, white xylan of medium to high molar mass was extracted from bleached birch kraft pulp by alkaline extraction. ► Neutral xylan ether derivatives with film forming properties were produced from extracted non-dried xylan or directly from pulp. ► Coatings of xylan derivatives on board showed bet...

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Bibliographic Details
Published in:Industrial crops and products 2013-01, Vol.44, p.692-704
Main Authors: Laine, Christiane, Harlin, Ali, Hartman, Jonas, Hyvärinen, Sari, Kammiovirta, Kari, Krogerus, Björn, Pajari, Heikki, Rautkoski, Hille, Setälä, Harri, Sievänen, Jenni, Uotila, Johanna, Vähä-Nissi, Mika
Format: Article
Language:English
Subjects:
adsorption
Barrier coating
Barriers
Betula
Binders
Birch kraft pulp
Coatings
Derivatives
derivatization
Extraction
Hemicellulose
kraft pulp
Latex
Modification
molecular weight
oxygen
packaging
permeability
Pigment coating
Pigments
polyethylene
Xylan
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Summary:► Pure, white xylan of medium to high molar mass was extracted from bleached birch kraft pulp by alkaline extraction. ► Neutral xylan ether derivatives with film forming properties were produced from extracted non-dried xylan or directly from pulp. ► Coatings of xylan derivatives on board showed better barrier properties than PLA and reached the level of PET coatings. ► Promising results were obtained in replacing conventional petroleum-based binders (latexes) with these xylan derivatives in pigment coatings of offset paper. This paper demonstrates opportunities for wood-based xylan derivatives to be used in coating applications. A route for extraction and purification of white and pure xylan from bleached birch kraft pulp is described as a part of the production of high adsorption and high crystalline pulp. Derivatization of the xylan during the extraction step was also demonstrated. Efficient derivatization of xylan to water soluble derivatives was achieved and promising results were obtained in primary application tests as a coating component in barrier coatings on board and as a binder component in pigment coating of offset paper. With the best xylan derivate coating, the barrier properties were better than with a commercial biopolymer coating, while oxygen permeability was roughly one third of that for a polyethylene terephthalate coating. Likewise, surface strength close to the reference latex as a binder in pigment coatings was achieved by a xylan derivative. This work is part of a platform of hemicellulose derivatives enabling novel application for this medium to high molar mass hemicellulose of high purity.
ISSN:0926-6690
1872-633X
DOI:10.1016/j.indcrop.2012.08.033