Abstract
The surface roughness, static and dynamic liquid wettability of modified poplar wood were measured by different surface treatment of brushing primer and sanding. With the increase of the number of grinding paper, the depth parameters Ra, Ry, Rz and Rp of surface roughness of modified poplar decreased, and the density parameter Sm (the average spacing of micro unevenness of contour) decreased at first and then increased. With the increase of number of the grinding paper, the contact angle of water and glycerol for modified poplar wood decreased at first and then increased. After the modified poplar wood was brushed with the primer and sanded with 240# sandpaper, the density parameter Sm was 0.307, the equilibrium contact angle of distilled water was 34.88, and the equilibrium contact angle of glycerin was 36.46, all of which were the lowest number. At this time, the surface roughness was improved, and the modified poplar has the good wettability that is greater than the mahogany wood wettability. Compared with mahogany, the rough depth parameters of the modified poplar are smaller to those of mahogany, but the Sm of modified poplar wood is greater than that of the mahogany. After the same surface pretreatment, the wetting speed of glycerol on the surface of mahogany is higher than that of the modified poplar.
Highlights
In European and American furniture, antique finishing process is a typical surface decoration technique, which gives furniture a sense of age through coloring with dyes or pigments and the adhesion of multiple layers of paint
The results showed that NaOH-treated surface had a relatively lower contact angle than methanol-treated wood
The results show that the glycerin wetting rate of the commonly used mahogany wood is greater than that of modified poplar, which is due to the rough surface of Sample 7 is greater than the surface roughness of Sample 5
Summary
In European and American furniture, antique finishing process is a typical surface decoration technique, which gives furniture a sense of age through coloring with dyes or pigments and the adhesion of multiple layers of paint. Standard open-type sandpaper with different grit sizes to grind wood samples on the eccentric sanding stand was used to obtain different wood surface roughnesses on samples [10]. It was determined that with increasing grit size of the abrasive material, the roughness of wood surface decreases in all three measurement directions, but a linear dependence was not been established due to the microstructure features of wood. The results showed that NaOH-treated surface had a relatively lower contact angle than methanol-treated wood. In view of the extremely complex and important surface finishing process used in European and American furniture production, how to obtain qualified or even excellent coating effect on modified poplar wood is worthy of in-depth study [13,14,15,16]. In this paper, focusing on the surface roughness of modified poplar after painting with primer, the difference of surface properties of modified poplar in pretreatment stage was compared and the influence of surface differentiation treatment on the surface roughness and wetting properties of modified poplar was explored
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