Abstract
This study provides a solution for the utilization of two waste materials, namely the residues of soft polyurethane foam from the production of mattresses and winter wheat husks. Thermal insulation panels with a nominal density of 50–150 kg/m3, bonded one-component moisture curing polyurethane adhesive, were developed, and the effect of the ratio between recycled polyurethane foam and winter wheat husk on internal bond strength, compressive stress at 10% strain, water uptake, coefficient of thermal conductivity, and volumetric heat capacity was observed. The developed composite materials make use of the very good thermal insulation properties of the two input waste materials, and the coefficient of thermal conductivity of the resulting boards achieves excellent values, namely 0.0418–0.0574 W/(m.K). The developed boards can be used as thermal insulation in the structures of environmentally friendly buildings.
Highlights
Nowadays, energetic efficiency, thermal insulation, and eco-compatibility are fundamental properties of modern buildings
The results show that the overall thermal conductivity coefficient increased with increasing husks, which corresponds to overall thermal conductivity coefficient increased with increasing husks, which corresponds to the density of the individual materials
The highest values were measured boards without added husks (31.1 kPa) and with the increasing number of husks, internal bond strength for boards without added husks (31.1 kPa) and with the increasing number of husks, internal bond decreased significantly, but this drop was only true for boards with less than 40% husks
Summary
Energetic efficiency, thermal insulation, and eco-compatibility are fundamental properties of modern buildings. Energy efficiency is strongly connected to the development of a building and the thermal insulation is one of the keys to increasing it. When thinking about insulation materials, it can be assumed that inside the wall structure these are the layers that contribute most to the overall thermal behavior of the walls during the warmest and coldest months. This is directly linked to the external conditions with its specific thermo-physical properties [4]. The increased investments in near-zero buildings is promoting the use of passive solutions for the envelope, resulting in increased insulation thicknesses of walls [5]
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