PRODUCTION OF COMPOSITE BOARD MATERIALS FROM BIODEGRADED CONIFEROUS WOOD

This paper presents the results of experimental studies assessing the degree of biodegradation of Siberian fir (Abies Sibirica) wood over a period of up to 19-20 years after bark beetle (Polygraphus proximus Blandford) infestation using Fourier-transform IR spectroscopy. It was established that wood biodegradation is accompanied by an increase in the relative proportion of lignin and its oxidation. A comparative analysis of the dimensional and qualitative characteristics of the fiber semi-finished product and its constituent fractions was conducted using a fibrillating milling set and mechanical activation of brown rot particles in a rotary-pulsation disperser. This made it possible to establish the physicochemical changes in wood during its biodegradation, effective methods for preparing semi-finished products depending on the degree of wood destruction, the composition of the semi-finished product when replacing the proportion of fibrous components with mechanically activated particles of brown rot, providing an improvement in the structure and connection of the components (by 15-35%) of the board material, an increase in its strength (by 10%) and water-resistant (by 15-35%) properties, without the use of additional hydrophobic and binding additives, while complying with the requirements of  GOST 4598-2018 semi-hard boards NT.