Room-temperature laminated of CCA-treated lumber with copolymer resins made of biomass extracts

Alkaline extracts of peanut hulls and pecan shell flour were used to synthesize co-polymer resins containing phenol, resorcinol, and formaldehyde. Three levels of molar ratios of formaldehyde to phenol, extracts, and resorcinol (0.75, 0.85, and 0.95) in combination with three levels of resin viscosity (350, 700, and 1 ,000 cps) were investigated. CCA-treated and untreated southern pine wood blocks were laminated with these experimental copolymer resins at room temperature and at 190 psi for approximately 18 hours. The gluelines were evaluated with the vacuum/pressure water soak method for testing exterior gluelines of structural glulam. In laminating CCA-treated southern pine lumber, several copolymer resins containing approximately 12.5 percent of resorcinol provided more than 85 percent wood failure and 1 ,000 psi shear strength. The higher molar ratio of formaldehyde to phenol, extracts, and resorcinol combined with lower viscosity exhibited the strongest glueline quality in bonding CCA-treated and untreated southern pine wood blocks.

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