Surface Chemistry of Gravure Printed Décor Paper and Adhesion of Melamine Formaldehyde Resin Coatings

Hatam, Abouzar; Firouzabadi, Mohammadreza Dehghani

doi:10.15376/biores.12.2.4239-4258

Cited by 4 publications

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References 14 publications

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“…The decorative foils are also extensively used as coating materials for lamination on wood based panels in furniture and decoration sectors. 4 Metals behave as hydrogen ions in accelerating the initial attack of the formaldehyde to the phenolic nuclei in formaldehyde based resins [5][6][7][8][9] . Indeed, they act as Lewis acids due to having vacant orbitals and the property of accepting a pair of nonbonding electrons.…”

Section: Introductionmentioning

confidence: 99%

Melamine–formaldehyde curing acceleration by TiO2-based silver-white pigments catalysis

et al. 2021

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The preparation of Melamine-formaldehyde (MF) resins was found to be catalyzed by TiO 2 -mica silver white pigments, the presence of small proportions of these advancing considerably the resin during its preparation under the same conditions. These pigments are composed mainly of TiO 2 -mica, as ascertained by X-ray diffraction (XRD), with the TiO 2 being mainly in its rutile phase but presenting alsosome traces of the anatase phase. FT-IR and 13 C NMR inferred clearly the presence of a catalytic effect of the TiO 2 -mica and appeared to indicate that the catalytic effect involved mainly the -NH 2 groups of melamine and on formaldehyde. According to the peak reaction temperature measured by DSC, the highest catalytic activity of TiO 2 on MF curing appears to be achieved at a 2% addition level by weight. Different possible explanations of this effect have been proposed, the most likely one being the catalytic effect caused by TiO 2 -promoted coordination complexes, the effect of acceleration being due to the Ti charge being stronger than that of H + , and the complex formed being unstable, thus not inhibiting the progress of the reaction.

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