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INFLUENCE OF SYNTHETIC AND NATURAL POLYMERS ON THE PHYSICAL AND MECHANICAL PROPERTIES AND THERMAL CONDUCTIVITY OF DIATOMITE HEAT INSULATORS
Abstract
Thermal insulating materials were obtained from diatomite and with burnable reinforcing additives, modified by synthetic and natural polymers. As burnable additives used rice husk, reinforcing additive is a basalt fiber, modifying polymer is polyvinyl alcohol and starch. Thermal insulating material obtained by mixing dry water mixtures at various ratios of components followed by drying and calcining at a temperature of 750 C. Parameters were determined linear shrinkage, density, compressive strength, the bending strength and thermal conductivity depending on the polymer content. It was found that the polymer additives have a positive impact on virtually all defined characteristics of thermal insulation materials, when the content of polymers from 0 to 1% by weight. The coefficients of linear shrinkage decreases from 14.5 to 4.5%, the compressive strength increased from 1.01 to 1.83 MPa, the bending strength increases from 0.2 to 0.4 MPa, the thermal conductivity decreases from 0.08 to 0.048 W/m?K. In this material the density is in the range 0.42-0.50 g/cm3. These materials are of practical importance for the manufacture of rigid insulation products used in thermal power generation.
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