Abstract
Urea-formaldehyde (UF) glue resins were the most important type of adhesives in the wood industry last 60 years, especially for the production of wood based panels. More convenient spray dried UF powders went into use last two decades. Small and medium private wood processing plants in Serbia prefer to use such powder adhesives, since they are more convenient for small capacity production. There is no production of UF powder resin in Serbia so necessary quantities are imported from abroad including producers from Asia. However, their characteristics are variable, dependent on syntheses steps and not well known among users. Objective of this research was to determine conveniences and lacks in application of two imported UF powder resins in comparison to domestic UF emulsion.
Highlights
Urea-formaldehyde (UF) glue resins were the most important type of adhesives in the wood industry last 60 years, especially for the production of wood based panels, gluing of furniture elements and veneering (Dunky, 2000)
Certain efforts have been undertaken for its improvements like: reduction of gel time and free formaldehyde emission, adhesive bonds fortifying, prolongation of storage life and more convenient transport and application
Gel time of 50-60 seconds and pot life of min. 2 hours are recommended
Summary
Urea-formaldehyde (UF) glue resins were the most important type of adhesives in the wood industry last 60 years, especially for the production of wood based panels, gluing of furniture elements and veneering (Dunky, 2000). Emulsions of UF resin concentrated to 65-69 % of dry matter were prepared within wood industry complexes nearby wood panel factories, or in chemical factories at the distances of few hundred kilometers. Storage life of such emulsions was about 40 days. But at the same time, more expensive spray dried UF powders went into use last two decades Such powders could be redissolved and redispersed in water to different concentrations just before application. Their storage life was prolonged to one year and they could be transported to a longer distances because of absence of water (Dunky, 1997)
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