Evaluation of compositions for bleaching wood affected by wood-coloring and mold fungi

Abstract

This article presents the results of tests to evaluate compositions for bleaching wood affected by wood-coloring and mold fungi. In the course of the work, the analysis of bleaching agents used in the pulp and paper, textile, and also in the woodworking industries was carried out. The advantages and disadvantages of using various bleaching agents for various types of wood are considered. As a result of the analysis of bleaching agents, four experimental compositions based on hydrogen peroxide (Н2О2), six formulations based on sodium hypochlorite (NaClO) (in three of which stabilizing additives were added). Experimental compositions were applied immediately after their preparation to samples of wood completely affected by wood-coloring and mold fungi. The treatment was carried out by applying a bleaching solution with a brush along the fibers to the surface of the sample on one side. The tests were carried out at room temperature and humidity 60 ± 5%. 24 hours after the application of the formulations, the effectiveness of these formulations was evaluated. As a result of the tests, compositions based on sodium hypochlorite showed a higher bleaching effect in comparison with compositions based on hydrogen peroxide.