Abstract
Waterborne acrylic-resin-filled urea–formaldehyde-based microcapsules with core–wall ratios of 0.42:1, 0.50:1, 0.58:1, 0.67:1, 0.75:1, 0.83:1 and 0.92:1 were prepared via in situ polymerization. Microcapsules were added into the primer to investigate the optical and mechanical properties of the coating on European linden. The results indicated that under the condition of the same core–wall ratio, chroma differences increased gradually with increasing concentration. The coating gloss decreased with increasing concentration. The hardness of 10.0–15.0% microcapsules increased more obviously, with the highest elongations at the break of the coating. At the 0.58:1 core–wall ratio and the 10.0% concentration, the coating adhesion was level 1 and the impact resistance was 10.0 kg cm. Microcapsule concentration did not affect the coating’s liquid resistance. The coating with 10.0% microcapsules added at a 0.58:1 core–wall ratio had a better self-healing property, a good stability and aging resistance. This paper lays a technical basis for the manufacturing and utilization of self-healing waterborne wood coatings.
Highlights
As a kind of green and environment-friendly renewable resource, wood is universally used in house furnishings, architecture and other fields [1]
By comparing seven kinds of microcapsules, it was obvious that when core–wall ratio increased—That is, the concentration of the core material increased—The agglomeration the microcapsules became serious
Obvious irregular particles can be observed in the scanning electron microscope (SEM) of microcapsules with 0.75:1, 0.83:1 and 0.92:1 core–wall ratios (Figure 2E–G)
Summary
As a kind of green and environment-friendly renewable resource, wood is universally used in house furnishings, architecture and other fields [1]. These kind of coatings have some shortcomings It will produce microcracks in the coating due to the poor adaptability to the environment, lack of toughness [7] and the nature of wet expansion and dry shrinkage of the wood [8], which will bring a sharp downgrade in terms of mechanical properties [9] and anti-corrosion properties of the coating [10]. These reduce the service life of the wood coating [11]. —To avoid the generation of microcracks in the wood coating and improve the wood’s service life—Intelligent coatings with self-healing functions have become a research hotspot recently [12], among which self-healing microcapsule technology is one of the most important ways to present the intelligent coating [13]
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