Integrated wood surface densification and Al2O3/melamine impregnated paper coating process: Properties evaluation

Abstract

Fast-growing wood is limited in its use due to its low density and poor strength. Strengthening its texture and enhancing its performance is crucial for maximizing the economic value of fast-growing wood. This study employed a one-step process of unilateral surface densification and coating, which involved compressing the surface of poplar wood and simultaneously applying Al2O3/melamine impregnated paper to achieve paint-free reinforcement modification. After modification, a cross-linking network structure was established at the interface of poplar wood and Al2O3/melamine impregnated paper with bonding strength satisfied superior product requirements for solid wood flooring as per GB/T 15036.1–2018. The natural texture and original aesthetic characteristics of poplar wood were preserved, the surface scratch resistance hardness was as high as 9 H, and the color and luster of the surface showed no obvious changes after being polluted by coffee and 25 % NaOH solution. Additionally, the functionalized wood also exhibited excellent mechanical properties with a modulus of rupture (MOR) of 112.6 MPa and a modulus of elasticity (MOE) reaching 9.33 GPa; the indentation diameter was only 7.5 mm, indicating excellent impact resistance, surpassing that of hardwood commonly used for wood flooring.