Method for reduction of formaldehyde emissions in wood composite

Details Method for reduction of formaldehyde emissions in wood composite Method for reduction of formaldehyde emissions in wood composite

1984-02-10

1985-02-26

Ball, Michael

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

1563313, 264109, 428529, 524597, B32B 2742

Patent

active

045016283

ABSTRACT:
The invention is a method of reducing formaldehyde emission from wood-based composite boards bonded with aminoplast resins. A salt mixture comprising urea, or one of its analogs, a readily decomposible ammonia liberating compound and, alternatively, a resin catalyst is prepared in a finely granulated form. This is then added to the dried wood particles and blended, preferably prior to the addition of the adhesive binder resin. The salt mixture comprises 12-20 parts of the ammonia liberating compound, 65-88 parts of urea or its analog, and 0-15% of the catalyst. From 6-22.5% by weight of this mixture is used, based on resin solids. Formaldehyde evolution is reduced by 45-80% compared with untreated particleboard without adverse effect on physical properties or press time.

REFERENCES:
patent: 3983084 (1976-09-01), Alexander et al.
patent: 4186242 (1980-01-01), Holmquist
patent: 4376807 (1983-03-01), Cannon et al.
patent: 4397756 (1983-08-01), Lehmann
patent: 4409293 (1983-10-01), Williams

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