Improving the mechanical resistance of waterborne wood coatings by adding cellulose nanofibres

Nanocellulosic fillers for waterborne wood coatings: reinforcement effect on free-standing coating films

“…Thus, the water repellency of the coating formulation is not negatively affected by nanocellulose addition. As reported elsewhere, the optical properties of a coating film on woody substrate are affected by nanocellulose addition in terms of reduced gloss due to increased surface roughness (Veigel et al 2014). In the case of free-standing films, optical transparency is a good measure of potential effects of nanocellulose addition on coating optics.…”

“…With regard to wood coatings, a number of studies have been published. CNC were reported to improve resistance against scratching and abrasion of acrylic latex, UV-curing waterborne varnish and high-solids coating (Kaboorani et al 2016;Landry and Blanchet 2011;Poaty et al 2014;Vardanyan et al 2014Vardanyan et al , 2015Veigel et al 2014). In addition to improvements in coating mechanics, also optical effects may be imparted by CNC addition to coatings (Vlad-Cristea et al 2013).…”

“…Generally, straightforward dispersion of CNC in waterborne formulations is reported, whereas chemical hydrophobization, for example by means of an organofunctional silane (Landry and Blanchet 2011) or acryloyl chloride or alkyl quaternary ammonium bromides , was required for nonpolar systems. Addition of CNF to coatings also provided improvements in mechanics (Grüneberger et al 2014a;Veigel et al 2014) and exhibited beneficial effects on the dispersion of inorganic additives (Grüneberger et al 2015;Jämsä et al 2011).…”

Nanofibrillated cellulose in wood coatings: Dispersion and stabilization of ZnO as UV absorber

“…Aloui et al [14] described strong cracking in waterborne acrylic wood coatings with TiO 2 nanoparticles after weathering, which did not occur in coatings without TiO 2 . Veigel et al [31] observed that NFC prevented the formation of micro-cracks in waterborne PU-acrylic wood coatings, which were present in coatings of the same binder with NCC or without any nanocellulose. They suggested that the long cellulose fibrils may inhibit the development and propagation of micro-cracks within the coating layer.…”

“…The group of B. Riedl at Université Laval (Canada) published several papers regarding the use of unmodified and hydrophobically modified NCC in wood coatings to improve the mechanical properties of coated wood surfaces (hardness, abrasion/scratch resistance) or to produce iridescent special effect coatings [26][27][28][29]. Landry and Blanchet [30] introduced silane modified NCC to wood coatings to produce hydrophobic coatings and Veigel et al [31] compared NCC and NFC in wood coatings with regard to their distribution in the coating and their effects on the mechanical properties. Jämsä at al.…”