Abstract
The biostability of organic film-formers of paints and varnishes intended for staining wood to the action of the fungus Aspergillus niger was studied. It was found that in Sabouraud's environment on days 7, 14 and 21 from the beginning of infection, the epoxy hardener is characterized by the minimum level of damage, respectively, 1, 1.6 and 2.4 points; alkyd film former has 2 points, and in subsequent time intervals 3.7 points; epoxy resin on day 7 is characterized by a lesion level of 1.7 points, on the following days of exposure – 4 points; pentaphthalic film former, respectively, 2.7, 3.7 and 4 points. According to the degree of resistance in the Sabouraud environment, organic film-formers of wood paints can be ranked as follows: epoxy (hardener)>alkyd>epoxy resin>pentaphthalic>organosilicon. It is shown that in the environment of Czapek on 7, 14 and 21 days from the beginning of infection, the minimum level of damage is characterized by an epoxy hardener, respectively, 2, 2.3 and 3 points; pentaphthalic film former, respectively, 2 and 3 points; alkyd film former, respectively, 2.4, 3.7 and 4 points; epoxy resin on day 7 is characterized by a lesion level of 3 points, on the following days of exposure – 4 points. According to the degree of resistance in the environment of Czapek, organic film-forming agents for wood paints can be ranked as follows: epoxy (hardener)>pentaphthalic>alkyd>epoxy resin>organosilicon. Organosilicon film-formers were most intensively affected by the fungus both 7 days after exposure and at a later time, reaching the maximum values of the lesions – 4 points. During the test period, no zones of mycelium growth inhibition were observed in the studied organic bases
Highlights
The main factors causing biological damage to wood are the microscopic fungi growing on wood and the insects
Considering the fact that the coloring of products made from substandard and partially contaminated pine wood, it is advisable to study the resistance of organic paint bases to the influence of the mold fungus Aspergillus niger
It was shown that with an increase in the exposure time, an increase of the level of damage of organic film formers of paints by the mycelium of the fungus occurs in the Sabouraud and Czapek media
Summary
The main factors causing biological damage to wood are the microscopic fungi growing on wood and the insects. Biological damage to wood occurs mainly as a result of the use of cellulose, lignin and other wood components by fungi and insects as a source of nutrition [3, 4]. In comparison to fungi and insects which directly destroy the wood fibers, cause less damage and have an indirect damage effect. Among the fungi that cause biological damage to wood, there are three main groups: fungi of surface mold (mold-like); wood-coloring; wood-destroying. Wood-destroying fungi destroy the structural components – the cell walls of wood. They affect living wood, wet and dump wooden materials and products made from them
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