PHOTO-REACTIVE ACRYLIC-ALKYD COMPOSITION WITH BIOCIDE ADDITIVE FOR WOOD PROTECTION COATING DEVELOPMENT

Introduction. The study of photo-reactive varnishes can serve as a basis for choosing alternatives in the restoration and preservation of historical and cultural heritage sites. Purpose of the study: The study aimed to explore the possibility of using photoreactive acrylic-alkyd composition with biocide additive as a paint and varnish material in construction as well as restoration and preservation. Methods. The possibility of obtaining protective thick-layer coatings from the proposed compositions with a thickness up to 80 μm without compromising polymerization efficiency in the layer was demonstrated by express Raman spectroscopy. Results. The coatings obtained by UV-curing from the composition with vinylated alkyd oligomers were tested to analyze vapor permeability, hardness, and hydrophobicity. The resistance of the specimens coated with the developed compounds against a mixture of mold fungi was studied. Aspergillus, Chaetomium, Trichoderma and Penicillium fungi were used as strains of micromycetes as those most infesting the open surfaces of timber. The effectiveness of biocide additive in the amount of 0.24 wt % is shown. The developed photo-reactive varnishes make it possible to form a finished wood coating within 1–2 minutes.