THE RESULTS OF THE SIMULATION OF THE HEAT INSULATION PROPERTIES OF WOOD POLYMER-SAND COMPOSITE
The development of woodworking and furniture industry in the past twentieth century was largely due to the launch of production of a large group of artificial materials, is referred to now wood-polymer composites. Diversity and renewability of the resource base, the convenience and economic efficiency of application of wood-plastic composites are the main preconditions for the development of this group of materials. Fillers in thermoplastic wood-plastic composites may be present in various forms. At this stage commercial wood-polymer composites (WPC) are manufactured mainly from minor fractions of wood flour and sawdust. It provides high technological plasticity of production, namely the possibility of manufacturing products by extrusion and injection molding, a variety of geometric shapes and even with a small wall thickness designs. This is true if you focus on the highest possible mechanical properties and the precision geometric shapes of the finished products. If you focus on producing WPC thermal insulation, for filling of such composites can be used almost any wood waste. For the study and prediction of insulation properties of wood polymer-sand composite (WPSC) developed a mathematical model. It is established that the thermal diffusivity of the wood with a protective resin-sand coating, were comparable to the diffusivity of pure wood (effective diffusivity 15-25 % higher). If the filler used is fragmented wood (chips, large fragments), the thermal diffusivity of the sample was significant, since heat is mainly distributed on the polymer-sandy channels between the pieces of wood. According to estimated calculations, KDP has 2-3 times better insulating properties than construction materials based on concrete.