HEAT-INSULATING BOARD WOOD POLYMER MATERIAL

Abstract

In the work, the heat-insulating properties of a product made of wood sawdust polymerized with mixtures of polyester and epoxy resins were investigated. It has been proven that the main regulator of the process is the density and porosity of the material, increasing humidity and wetting reduce heat-insulating indicators. Based on thermophysical dependences, the thermal insulation properties of sawdust materials were calculated and it was established that the thermal conductivity of the sawdust thermal insulation product was no more than 0.21·10^-6 m²/s, the thermal conductivity of the sample did not exceed 0.00285 W/(m∙K). In addition, the heat capacity of the product corresponds to a value within the range of 70…90 kJ/(kg·K), and the heat capacity value for the reed product was 32…33.5 kJ/(kg·K), respectively, which refers them to heat-insulating materials. The peculiarities of determining the process of wetting with water showed that for a heat-insulating product made of sawdust polymerized with polyester resin, water creates an obtuse, and ethylene glycol a sharp corner of the drop when wetting, on the other hand, for a heat-insulating product made of sawdust polymerized with epoxy resin, water creates a straight, and ethylene glycol a sharp corner of the drop when wetted, which shows their resistance to water absorption.