Resumen

ORRABALIS, C.; COSSIO, L.  y  MARTINEZ GARCIA, R.. Agglomerate of rice husk with polyurethane commercial adhesive. Quebracho (Santiago del Estero) [online]. 2020, vol.28, n.2, pp.123-133. ISSN 0328-0543.

Wood-like agglomerates based on agro-industrial waste particles have been studied for decades. The aim of this work is to obtain such kind of materials using rice husks and a low cost commercial polymeric adhesive (polyurethane, Rubinate 9040 from Huntsman®). To carry out the study, medium and low-density agglomerates were obtained. Four samples with different formulations (A, B, C, and D) were made and the following were the parameters studied: percentage of moisture absorption, swelling capacity, ignition point, and flexural strength. The humidity absorption values of the samples varied between 3.5 - 8.9 %, while that of the commercial sample used as control did between 58.5 - 73 % (measured at room temperature, and 40°C). The swelling capacity values of the samples varied between 1 - 5% versus 18% for the commercial control sample. The studied samples also showed ignition point higher than that of the control agglomerate sample. The values of flexural strength of the studied samples were lower than that of the control sample. The sample showing the best mechanical properties was formulation "B" with a flexural strength value of 12.22 MPa (the value of flexural strength for the control sample was 14.72 MPa). The wood-like agglomerates obtained show properties that make them eligible as dry-building materials when high mechanical resistance is not required. However, the samples obtained resist well the cutting mechanical stress of a traditional sawmill, do not generate rough edges when molded, and are moisture- and fire-resistant.

Palabras clave : rice husk; agglomerate; polyurethane.

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