Abstract
Canola meal as a by-product from the vegetable oil production provides a protein-rich material which is available in large quantities but with limited areas for application. The objective of this study was to investigate the possibility of utilizing canola meal adhesive for the production of wood fiber insulation boards (WFI) using the hot-air/hot-steam-process. WFI with two different thicknesses (40/60 mm) and different densities (110/140/160/180 kg/m³) were manufactured. The testing focused on their physical-mechanical properties such as internal bond strength (IB), compressive strength (CS) and short-term water absorption (ST-WA) measured according to European standards. For a better understanding of the material and curing dynamics, the canola meal was analyzed on its protein content, lignin and pentosane content as well as its extractives content using hot water, cold water and successive extraction. Using a canola meal based adhesive resulted in promising results for IB and CS up to density of 140 kg/m³. Nonetheless, there is place for improvement for the ST-WA.
Highlights
Insulation materials made from wood fibers can provide a resource-saving alternative to materials such as mineral fibers, expanded glass, foam glass, calcium silicate, perlite, expanded clay, natural pumice, rock wool, polystyrene or sheep's wool (Eichhorn, 2017)
The results show that the canola meal bonded wood fiber insulation boards (WFI) are comparable to the polymeric diphenylmethane diisocyanate (pMDI)-references cured via hot-steam and to the GUTEX industrial products regarding internal bond strength (IB) and compressive strength (CS)
ApMDI-reference cured via hot-steam (HS). bpMDI-reference cured via hot-air/hot-steam (HA/HS). cGUTEX-reference product Thermosafe homogen®. dGUTEX-reference product Multitherm®. eGUTEX-reference product Thermowall®. fGUTEX-reference product Ultratherm®. This pioneering study shows that it is possible to produce a canola meal based adhesive without expensive protein isolation for the manufacture of WFI
Summary
Insulation materials made from wood fibers can provide a resource-saving alternative to materials such as mineral fibers, expanded glass, foam glass, calcium silicate, perlite, expanded clay, natural pumice, rock wool, polystyrene or sheep's wool (Eichhorn, 2017). Once the moisture content of wood exceeds 20% of total weight, its insulating properties are lost (Informationsdienst Holz, 2007). Besides the sensitizing effect according to TRGS 401 there is the possibility of contact eczema (Bundesanstalt für Arbeitsschutz und Arbeitsmedizin, 2009). For this reason, both industry and science are searching for equivalent, alternative binders
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