Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1996-12-17
1999-08-31
Gallagher, John J.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
144352, 428525, 428529, 525501, 525503, 528146, C09J 504
Patent
active
059449381
ABSTRACT:
The invention is a method of gluing wood using a reactive two component thermosetting adhesive such as a phenol-resorcinol-formaldehyde (PRF) condensation product. One component is first coated on one of the members to be bonded. The second component is then spread directly on top of the first in a manner to minimize mixing; e.g., by spraying. When the mating member to be bonded is placed against the adhesive coated first member and pressure is applied the components are mixed. This begins the curing reaction between the components so that a thermosetting adhesive bond is formed. With selected adhesives very rapid curing times are possible. A preferred adhesive has a first component comprising a PRF resin mixed with a methylene group donor hardener such as paraformaldehyde. The second part is also a PRF resin. No hardener is present in the second part. Instead an oxygen and nitrogen containing heterocycle is used as an accelerator. Morpholine is a preferred compound. Cure times as low as two minutes to a handleable product are possible. The method is particularly useful for the manufacture of laminated veneer lumber.
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MacPherson Gerald N.
Winterowd Jack G.
Gallagher John J.
Weyerhaeuser Company
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