Aqueous phenolic dispersions for bonding higher moisture content veneers

Bonding higher moisture content (MC) veneer composites with a phenol-formaldehyde (PF) adhesive requires a resin capable of overcoming problems associated with excessive adhesive migration from the glueline and retardation of resin cure. An adhesive with improved moisture-tolerant bonding properties...

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Bibliographic Details
Published in:Forest products journal 1993-10, Vol.43 (10), p.29-34
Main Authors: Steiner, P.R, Troughton, G.E, Andersen, A.W
Format: Article
Language:English
Subjects:
ADHESIF
Adhesives
ADHESIVOS
Applied sciences
Aqueous solutions
Bond strength
CHAPAS DE MADERA
COMPOSE PHENOLIQUE
Composite materials
COMPUESTOS FENOLICOS
CONTENIDO DE HUMEDAD
Effectiveness
Exact sciences and technology
Factors
Forest products industry
Heat
Molecular weight
Phenols
PLACAGE
Plywood
Polymer industry, paints, wood
Resins
RESISTANCE MECANIQUE
RESISTENCIA MECANICA
Shear strength
Statistical data
Studies
Temperature
TENEUR EN EAU
VISCOSIDAD
VISCOSITE
Viscosity
Wood composites
Wood products
Wood-based materials
Wood. Paper. Non wovens
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Description
Summary:Bonding higher moisture content (MC) veneer composites with a phenol-formaldehyde (PF) adhesive requires a resin capable of overcoming problems associated with excessive adhesive migration from the glueline and retardation of resin cure. An adhesive with improved moisture-tolerant bonding properties was formulated that consisted of an alkaline insoluble but swellable dispersed PF phase, an alkaline soluble continuous phase, and a propylene carbonate additive. Methodology is described for forming the dispersed phase and for characterizing it through thermal softening measurements or by determining viscosity properties in caustic solutions. Significant bond quality improvements were found when comparing these dispersion adhesives with standard plywood adhesive formulations in the bonding of veneers with MCs of 10 to 12 percent
ISSN:0015-7473
2376-9637