Effect of Polyurethane Non-Transparent Coating Process on Paint Film Performance Applied on Modified Poplar

Wei Xu,Qingqing Liu,Di Gao

doi:10.3390/coatings12010039

Abstract

Whether modified poplar can obtain a qualified or even excellent finishing effect on European and American furniture is worthy of deep study. To evaluate whether the conventional non-transparent coating process is suitable for modified poplar, a multi-level hybrid orthogonal experiment method was carried out to start research on how factors affect the paint film performance of the non-transparent coating process. The effect of experimental factors and levels on paint film performance is pointed out, and the optimal factors and levels are found. Parameter optimization of the polyurethane non-transparent finishing process based on modified poplar is carried out. An application basis was provided for the extensive use of modified poplar wood as a substrate in the European and American furniture markets. The conclusions are: (1) gloss of paint film can be improved by increasing the number of nitrocellulose (NC) lacquer transparent topcoats, (2) adhesion and thickness of paint film can be improved by polyurethane (PU) sealing primer, (3) the initial paint film’s abrasion is influenced efficiently by the coating process and coating sanding. PU sealing primer has an efficient influence on the later abrasion of paint film. The effect of modified poplar surface pretreatment on the mass loss of paint film tends to be stable.

Highlights

The non-transparent coating process of European and American furniture is a kind of operation method characterized by full color [1]
The factors that have the greatest impact on the vertical reflection gloss of the paint film and coating process parameters that are optimal for increasing the GZT (%) value are the same as the above-mentioned optimal parameters of the GZL (%) value
The best finishing process parameter for increasing glossiness of paint film is “modified poplar painting Didebao primer—180# sandpaper sanding—spraying PU sealing primer—two passes of PU primer + two passes of NC topcoat—the paint film sanded with 400# sandpaper”

Summary

Introduction

The non-transparent coating process of European and American furniture is a kind of operation method characterized by full color [1]. This type of paint process is mainly based on polyurethane resin paint [2]. After multiple sprays on the wood surface, the paint film formed is thick, plump and opaque [3,4,5]. The non-transparent finishing does not require high-grade wood properties, especially the surface visual properties [6,7]. Some ordinary woods are selected for spraying. Modified poplar wood has the advantages of light color, long fiber, less resin and easy bleaching. Non-transparent coating pays more attention to the fullness of the paint film, the physical and chemical strength of the paint film and other properties [12,13]

Objectives

Methods

Results

Conclusion