Formaldehyde Release from Sulfur-Modified Urea-Formaldehyde Resin Systems

Formaldehyde release is measured as a function of the concentration of various sulfur compounds that were added to aqueous formaldehyde, a commercial urea formaldehyde particleboard. and particleboards manufactured from a urea formaldehyde resin. These compounds include sodium sulfate manufactured from sodium thiosulfate, sodium hydro-sulfide, sodium dithionite, sodium disulfite, and thiourea. Elemental sulfur, phenol, urea, and ammonium lignosulfonate were also used. Sodium disulfite and sodium dithionite are shown to eliminate approximately 90 percent of the formaldehyde release from aqueous solutions while sodium sulfite reduces formaldehyde release by approximately one half. Similar behavior for sodium disulfite and dithionite are reported for the reduction in formaldehyde release from urea formaldehyde particleboard resins. Parallel behavior, but to a significantly lesser degree, ‘is noted for formaldehyde release from particleboards made with urea formaldehyde resin. Two arguments are offered to explain these observations. The mechanical properties of the particleboards were not significantly affected by the presence of these formaldehyde scavengers.

You must be logged in to download any documents. Please login (login accounts are free) or learn how to Become a Member