Comparison of Canola and Soy Flour with Added Isocyanate as Wood Adhesives |
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Authors: | Mahsa Barzegar Rabi Behrooz Hamid Reza Mansouri Saeed Kazemi Najafi Linda F Lorenz Charles R Frihart |
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Affiliation: | 1. Department of Wood and Paper Science and Technology, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University, Imam Reza Blvd, Noor, 46414-356 Iran;2. Department of Wood and Paper Science and Technology, University of Zabol, Jahad Square, Zabol, 98615-538 Iran;3. Forest Products Laboratory, USDA Forest Service, One Gifford Pinchot Drive, Madison, WI, 53726-2398 USA |
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Abstract: | Canola is widely grown in the northern latitudes for its vegetable oil, generating large quantities of residual, low value canola flour used as animal feed. The common wood adhesive poly(diphenylmethylene diisocyanate) (pMDI) should react with the wide variety of functional groups in proteins. Therefore, it would seem that canola flour with added pMDI could be an effective adhesive. Two main questions are addressed in this study: How do the wood adhesive properties of canola flour compare to the better-studied soy flour? How well do proteins, which contain an abundance of functional groups, cure with the very reactive pMDI? These questions were addressed using the small-scale adhesive strength test ASTM D-7998, with various adhesive formulations and bonding conditions for canola flour plus pMDI compared to soy adhesives. The more challenging wet cohesive bond strength was emphasized because the dry strengths were usually very good. Generally, soy adhesives were better than canola ones, as was the polyamidoamine-epichlorohydrin cross-linker compared to pMDI, but these generalizations can be altered by the conditions selected. Three-ply plywood tests supported the small-scale test results. |
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Keywords: | Canola flour Soy adhesive Wood adhesive Poly(diphenylmethylene diisocyanate) Shear strength Water resistance |
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