Messi Biology states that in high-end manufacturing fields such as electronics, automotive, and aerospace, UV (ultraviolet) curable high-temperature coatings are becoming critical protective materials. These coatings must simultaneously meet the dual requirements of “rapid curing” and “high-temperature thermal conductivity.” Magnesium oxide (MgO), with its unique properties, has emerged as a key material to address this challenge, imparting efficient thermal conductivity to the coating while maintaining its high-temperature stability.
The thermal conductivity of magnesium oxide stems from its excellent physical properties. As an inorganic compound, it possesses a thermal conductivity of up to 53 W/(m·K), far exceeding that of traditional coating fillers, allowing it to rapidly dissipate heat in high-temperature environments. Furthermore, it combines a high melting point of 2852°C with excellent electrical insulation properties of 10¹⁵ Ω·m. It maintains structural stability at temperatures above 300°C, which prevents failure due to high-temperature melting while avoiding the risk of short circuits, making it highly compatible with the operating environments of UV high-temperature coatings.
In UV-curable systems, magnesium oxide enables thermal conductivity through specific scientific mechanisms. As a functional filler, it is uniformly dispersed at a weight ratio of 2% to 6% in UV-curable resins such as epoxy or silicone, forming a continuous thermally conductive network. When the coating is exposed to high temperatures, heat is rapidly conducted and diffused through the magnesium oxide particles, preventing localized overheating that can cause coating cracking or substrate damage. Concurrently, its wide-bandgap semiconductor characteristics (bandgap of 7–9 eV) allow it to absorb ultraviolet light, reducing UV radiation-induced degradation of the coating matrix, thereby synergistically improving the weatherability and service life of the coating.
Compared to traditional thermally conductive fillers like alumina (aluminum oxide) and boron nitride, magnesium oxide exhibits distinct advantages. It is not only cost-effective and environmentally friendly but also highly compatible with UV-curing systems, without compromising the rapid curing characteristics of the coating (which can cure within 1–3 minutes). More uniquely, its surface alkalinity and nanoscale effects can enhance coating adhesion and wear resistance, simultaneously improving both thermal conductivity and protective performance. In coatings for new energy vehicle battery compartments, the addition of magnesium oxide has been shown to increase thermal conductivity efficiency by 40% while passing national industry testing, thereby ensuring battery safety.
Currently, magnesium oxide is utilized in several high-end fields: in LED substrate coatings, it improves device heat dissipation efficiency by 30% and extends service life; in automotive turbocharger sensor coatings, its wide-temperature stability ranging from -60°C to 350°C ensures precise sensor operation; in 5G base station equipment coatings, it addresses the heat dissipation challenges of high-density components, supporting the stable operation of the equipment. With the advancement of nano-modification technology, the application of magnesium oxide in UV-curable high-temperature coatings is expected to expand further. This multifunctional material, combining thermal conductivity and protection, offers effective solutions to high-temperature protection challenges in high-end manufacturing, serving as a key contributor to industrial upgrading.