Author
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Dunn Jr, Larson |
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KARCHER, LARRY - UNIV. OF ILLINOIS |
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Submitted to: Forest Products Society
Publication Type: Abstract Only Publication Acceptance Date: 6/26/1997 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: The effects of methyl glucoside, derived from cornstarch, and a variety of soybean materials of varying protein levels on plywood glue mixes and phenolic resin syntheses were investigated. Some of the methyl glucoside results were presented earlier, so the results concerning soybean-based materials will be emphasized. Those results were obtained by replacing 10% of the phenolic resin in standard plywood glue mixes or by incorporating the materials directly into phenolic resin cooks by either simple addition or by replacement of a portion of the phenol, allowing the formaldehyde/phenol ratio of the resin to increase. The modes of addition were evaluated by the manufacture of test panels from which shear specimens were taken for wood failure and tensile strength determinations and by analysis of residual formaldehyde in the modified resins. A number of soybean-based materials appear to show promise by either mode of incorporation. Glues with spent soybean hulls, a by-produc of soybean processing, replacing 10% phenolic resin gave wood failures/ tensile strengths similar to controls while also exhibiting somewhat faster cure at short hot press times. Direct incorporation of soy molasses into phenolic resin cooks with 10% phenol replacement showed some evidence of cure acceleration, with wood failures equivalent to controls and a reduction in resin free formaldehyde. Resin syntheses were optimized for soy molasses, with up to 30% replacement of phenol possible before wood failure decreased. |
