Copolymer Resins of Bark and Agricultural Residue Extracts with Phenol and Formaldehyde: 40 Percent Weight of Phenol Replacement

Copolymer resins of phenol, formaldehyde, and chemicals from forest and agricultural residues were synthesized with 40 percent by weight of phenol replacement. The copolymer resins were evaluated for gluability with southern pine plywood and hot-press time requirements of the copolymer resins were also investigated. Several of the copolymer resins exhibited good bond quality even at a press time of 2 minutes (three-ply, 3/8-in.-thick panels, one panel per opening at 300?F platen temperature). Whereas the bond quality of the commercial P-F resins were unsatisfactory at the shortest press time, it provided satisfactory bond quality at the manufacturer’s recommended 3-minute press time and did very well at the longer press time of 4 minutes.

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