Overview
UV-9, chemically known as 2-Hydroxy-4-methoxybenzophenone, is a benzophenone derivative widely utilized as a UV absorber in industrial and consumer applications. It efficiently absorbs ultraviolet radiation in the 290-400 nm range, protecting materials from photo-degradation. The compound is particularly valued for its stability and compatibility with polymers. First commercialized in the mid-20th century, UV-9 has become a staple additive in industries requiring UV protection. Its molecular structure allows it to dissipate absorbed energy as heat, preventing chemical breakdown of host materials. While primarily used in plastics and coatings, it also finds applications in sunscreens and personal care products.
Physical and Chemical Properties
UV-9 presents as a light yellow crystalline powder with a characteristic mild odor. Its molecular weight of 228.24 g/mol and melting point of 62-65°C make it suitable for incorporation into various polymer matrices during processing. The compound demonstrates excellent solubility in organic solvents like acetone and ethanol, but negligible solubility in water. Chemically, UV-9 exhibits remarkable photostability, meaning it doesn't degrade significantly when exposed to UV light itself. This property is crucial for its effectiveness as a long-term protective agent. The benzophenone core structure enables efficient energy dissipation through keto-enol tautomerization, a process that converts harmful UV energy into harmless heat.
Main Applications
The primary application of UV-9 is in plastic products exposed to sunlight, including PVC pipes, automotive parts, and outdoor furniture. It helps prevent yellowing, cracking, and loss of mechanical properties caused by UV exposure. In coatings and paints, UV-9 extends the lifespan of finishes on buildings, vehicles, and industrial equipment. Beyond industrial uses, UV-9 serves as an active ingredient in some sunscreen formulations, though its use in personal care products has declined in favor of newer alternatives. The compound also finds niche applications in adhesives and sealants where UV resistance is required. Typical usage levels range from 0.1% to 2% by weight depending on the matrix and required protection level.
Safety and Storage
While UV-9 is generally considered low in toxicity, proper handling procedures should be followed. The compound may cause mild irritation to skin and eyes upon contact, and inhalation of dust should be avoided. Appropriate personal protective equipment including gloves and dust masks is recommended during handling. For storage, UV-9 should be kept in tightly sealed containers in a cool, dry place away from direct sunlight. The material is stable under normal storage conditions but may degrade if exposed to extreme temperatures or moisture over extended periods. Bulk quantities are typically packaged in 25kg fiber drums with polyethylene liners to ensure product integrity during transport and storage.
B2B Procurement Guide
When procuring UV-9 for industrial applications, buyers should prioritize suppliers who can provide detailed certificates of analysis including purity levels (typically ≥98%) and impurity profiles. Technical data sheets should specify UV absorption characteristics and compatibility information for various polymer systems. Price negotiations often consider order volume, with significant discounts available for bulk purchases. Many suppliers offer customized formulations where UV-9 is pre-blended with other additives for specific applications. Lead times can vary from 2-6 weeks depending on supplier inventory and production schedules. Quality verification through third-party testing is recommended for first-time suppliers or when changing sources.
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