Hexagonal boron nitride (h-BN) powders offer significant advantages as mold release agents in industrial applications, and their unique physicochemical properties make them suitable for a wide range of complex processes. h-BN's main advantage is its high-temperature stability. It can withstand temperatures up to 3000°C in an inert environment, and is stable in air up to about 900°C. This property allows it to excel in processes such as metal casting, high temperature alloy molding and ceramic sintering, and avoids the problems associated with the decomposition of traditional release agents due to high temperatures. At the same time, its layered crystal structure makes the coefficient of friction low, which can reduce the friction between the mold and molding material, reduce mold wear and prolong the service life of the mold, which is suitable for precision injection molding and high-precision die casting.

In terms of chemical compatibility, h-BN is virtually non-reactive with acids, bases, molten metals or organic solvents. This property is particularly important in epoxy curing, phenolic resin molding and the production of chemical equipment seals. For example, in the manufacture of epoxy circuit boards, h-BN release agents prevent residues from affecting circuit performance. In addition, its low surface energy and virtually no residue after mold release reduces cleaning costs while ensuring the surface finish of molded parts, making it widely used in the production of optical lenses, medical catheters and microelectronic components.

From the point of view of application materials, h-BN mold release agent is applicable to a wide range. For polymer materials, whether thermoplastic plastics such as nylon, polycarbonate high temperature injection molding, or thermosetting materials such as epoxy resin, phenolic resin curing molding, h-BN can be very good to prevent adhesion. In metal processing, aluminum alloy, magnesium alloy die casting, h-BN can prevent molten metal erosion of the mold; in the precision casting of titanium alloy and other high-temperature alloys, its high-temperature-resistant properties are particularly prominent. For food contact grade products, such as silicone pacifiers, baking molds, h-BN's non-toxic properties meet safety standards. For mold release in the highly corrosive environment of fluoroelastomer seals, h-BN also meets the needs. In the ceramics and glass industry, h-BN is suitable for sintering release of structural ceramics such as silicon nitride bearings and alumina substrates, as well as high-temperature die casting of optical lenses. In the molding of carbon fiber reinforced composites (CFRP) for aerospace components, h-BN improves mold release efficiency and product surface quality.

Compared with traditional mold release agents, h-BN has obvious advantages. Compared with silicone oil-based release agents, it does not leave an oily residue and is suitable for scenarios requiring high cleanliness; compared with graphite-based release agents, h-BN is a white powder, avoiding dark contamination, and there is no risk of electrochemical corrosion of metal molds; compared with wax-based release agents, h-BN does not decompose at high temperatures, avoiding the generation of fumes, and is more environmentally friendly. In practical application, h-BN powder needs to be evenly dispersed through spraying or pre-coating process, and its higher raw material cost can be compensated by reducing mold maintenance and improving product yield. With the increased demand for precision manufacturing in emerging fields such as new energy battery diaphragm coatings and 5G ceramic filters, h-BN is becoming an important release solution in the manufacturing industry.