Surface retention of polyurethane and acrylic coatings on impregnated spruce wood (Picea abies Karst) and comparison with some wood preservatives

The natural spruce wood has low resistance against biological degradation and weather effects, so further protection is required, up to meeting the durability requirements for used in exterior classes. According preservatives standards, coatings as water repellents belong group OS (organic solvent) preservatives. have a water-repellent function, they are not toxic, these advantages make them usable like impregnation material. objective of this work (Picea abies Karst) using “Double vacuum process” with coating material based on polyurethane acrylic isocyanate resins determinate quantity wood. efficiency expressed through retention. retention compared minimal standard prescribed preservatives, most frequently used, namely creosote, copper chrome arsenate (CCA) waterborne copper-rich systems azole (CBA-A, Thanalite E), show applied double process. significantly different from minimum creosote amounts 118 - 149 kg/m3 or 32 38 times higher than recommended CCA CBA-A use. can be successfully purposes. Key words: impregnation, retention, wood, coatings, coatings.