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Adhesive Performance of Rice Bran as a function of Thermal and Chemical Treatments

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  036230,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.14227) @2003
Authors:   Anna K. Cathcart, Zhongli Pan
Keywords:   Rice bran, sulfites, natural adhesive, particleboard, wood

Manufacturing industries have been seeking effective biobased adhesives to replace synthetic adhesives currently used in composite materials for reducing product cost and environmental pollution concerns, as well as dependency on petroleum. The biobased adhesives could be developed by modifying natural components such as starch and protein. The objective of this study was to investigate the effects of thermal and chemical treatments on the adhesive properties of defatted rice bran. Three levels of temperature (80, 100 and 120oC) and three levels of pH (8, 10 and 12) were tested. Furthermore, the influence of sodium sulfite and sodium bisulfite on adhesive properties was also investigated. The evaluated adhesive performance included strength, yield, viscosity and pH of prepared adhesive. Adhesive strength for soft maple wood binding was measured by using an Instron testing machine. The maximum force required to shear the adhesive bond was reported as adhesive strength. The results showed that heat and alkali treatments significantly improved the rice bran adhesive strength from 44N for the untreated control to 181N for the sample treated at 100 C and pH 12. The rice bran based adhesive could be potentially used for the production of composite materials, such as particle and fiberboard. Treating the adhesive with sulfites decreased adhesive strength contrary to what was expected.

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