Treatment of formaldehyde laden wood panels to reduce excess for

Details Treatment of formaldehyde laden wood panels to reduce excess for Treatment of formaldehyde laden wood panels to reduce excess for

1980-10-27

1983-03-15

Lesignan, Michael R.

Stock material or miscellaneous articles

Composite

Of aldehyde or ketone condensation product

427341, 427342, 427401, 427382, 428529, 1563319, B32B 2108, B32B 2742

Patent

active

043768075

ABSTRACT:
A substantial reduction of free excess formaldehyde in formaldehyde laden wood panels is achieved by coating at least one side of the panel with a salt solution containing an ammonium cation such as a 10-15% aqueous solution of ammonium bicarbonate. After coating, a barrier is placed over the coated surface such as by stacking a plurality of similarly coated panels with the barrier being maintained sufficiently long to allow ammonia gas generated from normal degradation of the ammonium salt to migrate to the free formaldehyde zone where the ammonia gas reacts with the formaldehyde to produce a stable, low volatility reaction product. The treatment may be applied to raw or finished panels and the generated ammonia gas reacts in the stacked panels with formaldehyde in both the glue lines and the formaldehyde based finish topcoating.

REFERENCES:
patent: 2833670 (1958-05-01), Roth
patent: 2870041 (1959-01-01), Waddle et al.
patent: 4186242 (1980-01-01), Holmquist
Paper given at 1980 Particleboard Symposium, "Using the Verkor FD-EX Chamber to Prevent Formaldehyde Emission from Boards, Manufactured with Urea Formaldehyde Glues," Steve I. Simpson, Date of first publication unknown, p. 3.

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