Effects of Addition Ammonia Modified Urea-Melamine-Formaldehyde Resin on the Adhesions and Formaldehyde Emission in Plywood

Jun You Shi; Sheng You Ye

doi:10.4028/www.scientific.net/AMR.113-116.1226

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 113-116Effects of Addition Ammonia Modified...

Effects of Addition Ammonia Modified Urea-Melamine-Formaldehyde Resin on the Adhesions and Formaldehyde Emission in Plywood

Abstract:

This study was carried out to investigated the effect of addition ammonia which concentration is 20 percent modified urea-melamine-formaldehyde resin on the formald-ehyde emission and internal bonding strength, when hotpress temperature, time and pressure for every plywood was coincide.To determine and compare the effect of ammonia content 0, 2.5, 5 percent by weight of formaldehyde were used. To determine the level of formaldehyde emission, we used the desiccator method. The formaldehyde emissions from poplar multi-plywoods were significantly decreased with increased additions of ammonia, at a ammonia ratio of only 2.5%, the formaldehyde emission level of the un-coated samples which is seven-ply plywood can meet the F☆☆☆ grade, and also the samples with 2.5% ammonia modified resin hot-pressed showed good bonding strength.

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Periodical:

Advanced Materials Research (Volumes 113-116)

Pages:

1226-1229

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.113-116.1226

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Online since:

June 2010

Authors:

Jun You Shi, Sheng You Ye

Keywords:

Ammonia, Bonding Strength, Formaldehyde Emission, Urea-Formaldehyde Resin

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