STRENGTH OF HEAT-INSULATING WOOD-POLYMER MATERIALS

Abstract

The article emphasizes that wood is a good insulating material because it has low thermal conductivity. However, it also has negative properties, such as a tendency to rot, which can occur due to moisture or inefficient ventilation, etc. To study the strength of wood-composite insulation products, samples of different ratios of wood and adhesive were formed, in particular, with water-soluble adhesives, as well as with polyester and epoxy resins, by mixing them with sawdust in a 1:2 ratio. The use of binders based on synthetic resins in the formulation of thermal insulation products from sawdust improves environmental safety and weather resistance of products, as such resins are characterized by resistance to water and temperature changes. It also reduces the formation of microorganisms in the structure of the product, because the material that insulates the building becomes stronger and harder, and does not sag over time. All of this leads to a reduction in the labor intensity of laying thermal insulation for a building and the possibility of insulating heat-generating equipment and heat-carrying pipelines, reducing the consumption of building materials and reducing the share of energy for heating. The study of compressive strength showed that sawdust products with water-soluble adhesives are more fragile and the compressive strength for starch-based adhesives is 22 times lower than for D4 adhesive and more than 30 times lower than for polymer resins. The samples with PVAc D3 and D4 adhesive have a higher tensile strength than those with polyester resin, so the tensile strength decreases only 1.6 times. Accordingly, the compressive strain along the compression thickness for the epoxy-based product exceeds the value for polyester resin almost twice.