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

Alkaline extracts of peanut hulls and pecan shell flour were used to synthesize copolymer resins containing phenol, resorcinol, and formaldehyde. Three levels of molar ratios of formaldehyde to phenol, extracts, and resorcinol in combination with three levels of resin viscosity were investigated. CC...

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Bibliographic Details
Published in:Forest products journal 2000-03, Vol.50 (3), p.81-86
Main Authors: CHEN, C.-M, NICHOLLS, D. L
Format: Article
Language:English
Subjects:
Adhesion
Adhesives
Applied sciences
Biomass
Bond strength
Caustic soda
Chemicals
Curing
Environmental protection
Exact sciences and technology
Forest products industry
Investigations
Lumber
Phenols
Polymer industry, paints, wood
Preservatives
Resins
Shear strength
Shear tests
Studies
Timber
Variance analysis
Viscosity
Wood products
Wood-based materials
Wood. Paper. Non wovens
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Summary:Alkaline extracts of peanut hulls and pecan shell flour were used to synthesize copolymer resins containing phenol, resorcinol, and formaldehyde. Three levels of molar ratios of formaldehyde to phenol, extracts, and resorcinol in combination with three levels of resin viscosity 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% of resorcinol provided more than 85% 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.
ISSN:0015-7473
2376-9637