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