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Polyester–melamine coil coating formulation reinforced with surface-modified cellulose nanofibrils
KTH Royal Institute of Technology, Sweden.
Nordic United Coatings, Sweden.
RISE Research Institutes of Sweden, Materials and Production, Corrosion. KTH Royal Institute of Technology, Sweden.ORCID iD: 0000-0001-6438-1357
SSAB Europe, Sweden.
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2023 (English)In: Progress in organic coatings, ISSN 0300-9440, E-ISSN 1873-331X, Vol. 182, article id 107608Article in journal (Refereed) Published
Abstract [en]

In light of the need to redesign industrially produced materials by utilizing renewable resources, nanoscopic forms of cellulose are regarded as a valuable asset. In this work, the potential of cellulose nanofibrils (CNFs) as an unconventional nanoadditive for a polyester–melamine coil coating formulation is explored. CNFs, hydrophilic nanomaterials with high aspect ratios, were successfully incorporated in the solvent-borne formulation. Coatings were prepared with extremely low loadings of the nanoadditive (0.5 and 0.7 wt%). At these concentrations, the volume fraction of the nanofibrils in the coatings was calculated to be close to their percolation threshold. Two different pathways of CNF surface modification were applied to allow for a good compatibilization in the resin matrix, and the formulations were cured in two different settings. The effective compatibilization of the nanoadditive led to a significant variation of the viscoelastic properties in the coatings containing CNFs. The results from dynamic mechanical analysis (DMA) highlighted the effect of CNFs on the crosslinked network at the nanoscale, resulting in an increase in Tg. Additionally, an increase in the stress at break and Young's modulus was determined by tensile testing, while satisfactory elongation at break was preserved. Other relevant effects induced by the presence of CNFs on the properties of the coatings were highlighted, such as a significant matt effect, increased surface roughness and lower scratch resistance. A preliminary evaluation of the water barrier properties by electrochemical impedance spectroscopy (EIS) is also presented, suggesting that the incorporation of a hydrophilic nanoadditive did not lead to a deterioration of the coatings' performance. © 2023 The Authors

Place, publisher, year, edition, pages
Elsevier B.V. , 2023. Vol. 182, article id 107608
Keywords [en]
Cellulose nanofibrils (CNFs), Coil coating, Compatibilizer, Mechanical reinforcement, Nanocomposite, Polyester–melamine, Cellulose, Coatings, Contact angle, Deterioration, Elastic moduli, Electrochemical impedance spectroscopy, Hydrophilicity, Nanofibers, Reinforcement, Solvents, Surface roughness, Tensile testing, Viscoelasticity, Cellulose nanofibril, Cellulose nanofibrils, Coating formulations, Coil coatings, Hydrophilics, Modified cellulose, Nanoadditives, Polyester-melamine, Surface-modified, Aspect ratio, Degradation, Water, Wettability
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-64632DOI: 10.1016/j.porgcoat.2023.107608Scopus ID: 2-s2.0-85152947285OAI: oai:DiVA.org:ri-64632DiVA, id: diva2:1756978
Note

 Funding details: Knut och Alice Wallenbergs Stiftelse; Funding details: Wallenberg Wood Science Center, WWSC; Funding text 1: This research was financially supported by SSAB Europe (Borlänge, Sweden), Wilhelm Beckers Jubileumsfond (Stockholm, Sweden) and the Knut and Alice Wallenberg Foundation (KAW) through the Wallenberg Wood Science Center (Stockholm, Sweden). 

Available from: 2023-05-15 Created: 2023-05-15 Last updated: 2023-05-15Bibliographically approved

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Wärnheim, Alexander

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