The Effect of Decorative Coatings by mixing of Poly Vinyl Acetate and Urea- Formaldehyde on Physical and Mechanical Properties Particleboard

In this study the effect of adhesive types and coated veneer on the physical and mechanical properties of particleboard were studied. Two types of coating, including natural veneer of beech and artificial veneer of High Paper Lamination (HPL, formica) and three types of adhesive composition including (100 % UF), (15% PVA + 85 % UF) and (25% PVA + 75% UF) were used to stick the veneer on particleboard. Physical and mechanical properties of the boards were evaluated according to the EN and ASTM standards. The results of this study showed that increasing PVA resin mixed with UF adhesive, in natural and artificial veneers covering, improved the physical and mechanical properties of the boards. Also, the results indicate that the beech veneer boards are more adhesive than formica. However, formica coated boards compared with beech veneer boards, showed higher bending strength and higher modulus of elasticity. It is evident that the water absorption and thickness swelling values in formica coating boards were less than the beech veneer. Collectively, for production of wooden furniture such as library shelves and cabinets, formica decorative coatings must be used to improve the bending strength. The formica decorative coatings are high in abrasion resistance and stable in humid environment. To stick formica decorative coatings on particleboards, the recommended mix design is 25% PVA and 75% UF resin.