Gas Evolutions from Paints and Varnishes When Fungus Molds and their Metabolites Act on Them. Issue 4 (March 2021) - Smirnov, V
Abstract: In this article are presented the results of a study of the biodegradation of paints and varnishes. For testing were used enamels based on phenol-formaldehyde and epoxy resins. Samples from the studied materials were tested under the influence of micellar fungi of the species aspergillus niger, penicillium chrusogenum, trichoderma viride, as well as in the products of their metabolism: a mixture of oxalic, succinic, citric, malic, fumaric, α-ketaglutaric and oxalacetic acid and enzyme of peroxidase. The experimental and control samples were kept in a thermostat at a temperature of 29 ± 2.0 ° C and relative humidity of 98%. The qualitative composition of gas evolution was determined by chromatographic identification methods using chemical methods. The dynamics of gas evolution from paints based on enamels during their biodegradation by micromycetes and their metabolites has been experimentally determined. After only one month of exposure to aggressive media, the composition of gas evolution was changed significantly compared to gas evolution from control samples. By the third month of exposure, the total concentration of gas evolution was increased by 3.8 and 6 times compared with gas evolution from control samples. When the samples were kept in the products of fungal metabolism, a difference in the composition of gas evolution was revealed when microscopic fungi were being acting on these materials.