Effect of Coating Process on Mechanical, Optical, and Self-Healing Properties of Waterborne Coating on Basswood Surface with MF-Coated Shellac Core Microcapsule.

Yu Tao,Yijuan Chang,Xiaoxing Yan

doi:10.3390/polym13234228

Abstract

Self-repairing microcapsules prepared with melamine formaldehyde (MF) resin as wall material and shellac and waterborne coating as core material were added to waterborne coating to prepare a self-repairing coating. In order to explore the effect of the coating process on the performance of the waterborne coating on the basswood surface with microcapsules, the number of coating layers of primer and finish and the addition mode of the microcapsules were tested as influencing factors. The effects of different coating processes on the optical, mechanical, and liquid resistance of the basswood surface coating were investigated. The results showed that different coating processes had little effect on the color difference of the coating. When the coating process was two layers of primer and three layers of finish, and microcapsules were added to the finish, the minimum gloss of the basswood surface coating at 60° incident angle was 10.2%, and the best mechanical properties, liquid resistance, and comprehensive properties were achieved. Finally, the aging resistance and self-healing performance of the waterborne coating on the basswood surface prepared by this coating process were explored. The results showed that the waterborne coating had a certain repair effect on scratch damage. This paper lays a theoretical foundation for the practical application of self-healing microcapsules in wood-surface waterborne coatings.

Highlights

Accepted: 27 November 2021As a green environmental-protection material, wood is widely used in furniture manufacturing and other industries [1,2]
The Scanning electron microscope (SEM) and Fourier transform infrared spectrometer (FTIR) of microcapsules prepared at 600 rpm are shown in Figures 1 and 2
There was a small amount of agglomeration, the particle size was basically uniform and the preparation was in good condition

Summary

Introduction

Accepted: 27 November 2021As a green environmental-protection material, wood is widely used in furniture manufacturing and other industries [1,2]. The use of waterborne wood coatings can close wood pipe-holes, protect wood surface quality, and improve wood utilization [6,7]. Self-repairing microcapsule technology has been introduced into the field of wood coatings [10,11,12], so as to achieve the purpose of repairing coating cracks and improve the usability and safety of wood coatings [13]. When cracks occur in the coating, the self-repairing waterborne coating can automatically repair the cracks [14]. This technology is of great significance in regulating the characteristics of wood surface coating and improving its defects

Methods

Results

Conclusion