Polyurethane Coatings from Liquefied Wood Containing Remains of a Copper-, Chromium-, and Boron-Based Wood Preservative

摘要

Preparation of polyurethane wood coatings based on copper-, chromium-, and boron (CCB) containing liquefied wood was performed, as an alternative way to manage postconsumed preservative-contaminated wood. Additionally, we examined the possibility of improvement of selected properties of the liquefied wood-based coatings by an addition of silica nanoparticles. The constituents of the CCB wood preservative do not exhibit an influence on a liquefaction process and on composition of the liquefied mixture. CCB also does not affect curing of the formulations containing liquefied wood and an isocyanate-type hardener. Furthermore, influence of CCB on adhesion strength of liquefied wood-based coatings on a wooden substrate, their hardness, and resistance to scratching and to water, acetone, and alcohol, is not exhibited. However, apart from these, from the applicative point of view, positive results, any improvement of the coating properties by the addition of silica nanoparticles is not shown.