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

Abstract:

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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.

Info:

Periodical:

Advanced Materials Research (Volumes 113-116)

Edited by:

Zhenyu Du and X.B Sun

Pages:

1226-1229

DOI:

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

Citation:

J. Y. Shi and S. Y. Ye, "Effects of Addition Ammonia Modified Urea-Melamine-Formaldehyde Resin on the Adhesions and Formaldehyde Emission in Plywood", Advanced Materials Research, Vols. 113-116, pp. 1226-1229, 2010

Online since:

June 2010

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Price:

$35.00

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