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Common Defects in UV Wood Coatings (Part 6)
The essence of clear coating lies in providing a protective layer for wood products while fully showcasing the wood’s natural grain and color. However, in the practical application of UV wood coatings, a defect known as “whitening” frequently undermines this ideal outcome. After curing, the coating film loses its intended clarity and transparency, developing a milky-white, hazy opacity that resembles a delicate mist or sheer veil. Mild whitening slightly blurs the wood grain, whereas severe whitening renders the film completely opaque, entirely obscuring the grain and giving the surface the appearance of frosted glass. Under illumination, whitened areas exhibit diffuse reflection, forfeiting the depth and luster characteristic of a well-cured coating; yet the surface remains smooth to the touch, creating a stark contrast between visual and tactile sensations. Whitening is often accompanied by reduced film hardness, significantly compromising protective performance, and is the result of complex interactions among multiple factors, including moisture interference, residual solvents, and pigment precipitation.
2026-03-13
Common Defects in UV Wood Coatings (Part 5)
UV wood coatings aim for a uniform, continuous, and perfectly smooth film; however, in actual production, a defect known as craters frequently disrupts this ideal. On the coating surface, circular depressions of varying sizes appear, often resembling regular bowls or volcanic craters, with tiny particles or contaminants typically visible at the center. The edges of these depressions are markedly raised, forming prominent annular ridges. The craters are usually isolated and differ in depth; in severe cases, they can expose the substrate directly. Under illumination, the cratered areas exhibit a distinct gloss contrast compared with the surrounding film, while the raised rims reflect a bright halo. Once formed, craters cannot be masked by subsequent coating applications—each reapplication reproduces the same defect on the fresh wet film, posing significant challenges for product rework. Although seemingly minor, these depressions result from uncontrolled paint flow caused by differences in surface tension, reflecting systemic root causes that range from environmental contamination to inadequate substrate cleanliness.
2026-03-13
Common Defects in UV Wood Coatings (Part 4)
In UV wood coating applications, pinholes are a common and troublesome film defect. The coating surface is dotted with tiny, visually discernible holes—circular or elliptical in shape—with slightly raised edges and a depressed center that extends down to the underlying coating layer or even the substrate itself. When densely distributed, they resemble the marks left by needle punctures, appearing as discrete dark spots under illumination and feeling like fine depressions to the touch. In clear topcoats, pinholes readily trap dust, forming black specks; in pigmented coatings, they give rise to color variations, severely compromising both the aesthetic quality and stain resistance of the finished product. Although small, pinholes reflect a delicate imbalance between gas release during film formation and subsequent film curing, revealing the complex interplay of bubble evolution, substrate characteristics, and solvent evaporation, among other factors.
2026-03-13
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Boxing New Materials cordially invites you to visit the 2025 China International Coatings Exhibition.
UV monomer with a curing speed more than 30% faster than that of trifunctional monomers
Low-irritation version of HDDA
A high-refractive-index UV monomer
Although it’s quite ordinary, it offers great value for the price.
A UV monomer used in fields such as PCB ink, UV curing agents, and offset printing ink.
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