Overview
2-Hydroxy-5-methylbenzophenone (CAS 920-39-8), commonly known as UV-9, is a benzophenone derivative widely used as a UV absorber in industrial applications. It effectively absorbs ultraviolet light in the 280-350 nm range, protecting materials from degradation caused by UV exposure. The compound is synthesized through Friedel-Crafts acylation reactions and is commercially available as a light yellow to white crystalline powder. As a cost-effective UV stabilizer, it finds extensive use in polymers, coatings, and adhesives. Its molecular structure allows it to dissipate absorbed UV energy as heat, preventing chain scission or discoloration in host materials. The compound is favored for its balance of performance, stability, and compatibility with various matrices.
Physical and Chemical Properties
2-Hydroxy-5-methylbenzophenone exhibits a melting point range of 62-66°C, making it suitable for incorporation into thermoplastic processing. It demonstrates excellent solubility in common organic solvents like ethanol, acetone, and toluene but is virtually insoluble in water, a property that enhances its durability in outdoor applications. The compound's UV absorption spectrum peaks around 285-290 nm and extends to 350 nm, covering the critical range for terrestrial solar UV radiation. Its photostability arises from an intramolecular hydrogen bond between the hydroxyl and carbonyl groups, facilitating energy dissipation. The material shows low volatility under normal processing temperatures, ensuring long-term performance in end products.
Main Applications
The primary use of 2-Hydroxy-5-methylbenzophenone is as a light stabilizer in polyolefins (PP, PE), PVC, polystyrene, and unsaturated polyesters. It prevents yellowing and embrittlement in plastic products ranging from packaging films to automotive components. In coatings, it protects painted surfaces and wood finishes from UV-induced fading and cracking. The compound also serves in adhesives, sealants, and rubber products where UV resistance is required. Some personal care formulations incorporate it as a sunscreen agent, though this application is declining due to newer alternatives. Industrial buyers should note its effectiveness is often enhanced when combined with hindered amine light stabilizers (HALS) for synergistic protection.
Safety and Storage
While not classified as hazardous under GHS, 2-Hydroxy-5-methylbenzophenone requires standard chemical handling precautions. Use gloves and safety goggles to prevent skin/eye contact, and avoid generating dust during handling. The material is stable under normal conditions but should be kept away from strong oxidizers. For storage, maintain containers tightly sealed in a cool, dry area with adequate ventilation. Bulk quantities are typically supplied in 25 kg fiber drums or poly-lined bags. Shelf life exceeds two years when stored properly. In case of spillage, collect material mechanically and dispose of according to local regulations. Always consult the SDS for specific first aid measures and firefighting guidelines.
B2B Procurement Guide
When procuring 2-Hydroxy-5-methylbenzophenone, industrial buyers should prioritize technical grade material with ≥98% purity, verified by HPLC analysis. Request batch-specific certificates of analysis (CoA) and ensure the supplier can provide full regulatory documentation (REACH, TSCA compliance). For large-volume purchases (tonnage quantities), negotiate pricing based on annual contracts, as spot market prices may fluctuate with raw material costs. Consider regional suppliers to minimize logistics expenses—major production centers exist in China, India, and Europe. Evaluate suppliers for ISO 9001 certification and ask for samples to test compatibility with your specific application before bulk ordering.
Related Manufacturers
- 主营：杜仲素、对位酯、丙烯酸酯、二氧化硫脲、乙基麦芽酚、饲料添加剂、油酸基硬脂酸、二苯基硅二醇
- 主营：乙二醇、二甲基亚砜、丙二醇、4-丁二醇、精对苯二甲酸、己二酸、聚乙烯醇、聚乙二醇、木质素、甘油、三甘醇、己内酰胺、叔十二硫醇、白油、对苯二甲酸二甲酯
- 主营：固体酸催化剂、重组胶原蛋白、硅油、t-BAMBP萃取剂、特种硅油、聚硅氮烷、硼酸铝晶须、碳化硅晶须、全氟三丁胺
- 主营：粘结剂、阻燃剂、絮凝剂、3584-23-4、l-丙交酯、引发剂、哌啶基、封端剂、乙交酯、抗菌剂、交联剂、肌肽锌、增亮剂、干燥剂、润滑剂、护发剂、粘合剂、对位酯、阻聚剂、稀释剂、羟乙基、偶联剂、分散剂、中间体、丙烯酸锌
- 主营：阻燃剂、甲醇钠、胶黏剂、溴壬烷、新癸酸、浸提剂、氯铂酸、加香剂、稀释剂、正丁腈、桉树醇、白樟油、丁硫醇、正十烷、叔辛胺、防水剂、碘酸钠、碘酸钾、润滑油、碘酸钙、粘着剂、偶联剂、胶粘剂、羊油酸、琥珀腈
- 主营：甲基氯化镁
- 主营：丙酸氯倍、二水草酸锰、a庚酸雌c二醇、4-戊烯基、5-氟胞嘧啶、噻奈普原汀酸粉
- 主营：丁烯酯、甘氨酸、甲酸镍、920、乙酸镁、阻燃剂、乙酸镉、木香油、酸性橙、西瓜酮、硫酸锌、硫酸锆、硫酸锂、杨梅酯、百里酚、硫酸锶、硫酸锰、二苯胍、十八酸、紫苏葶、聚合物、肌氨酸、卡必醇、碳酸镧、褪黑素、磷酸铁
- 主营：石竹素、中间体、邻氟氯苄、反-查耳酮、2-甲基哌嗪、2-糠酸甲酯、2-噻吩甲醛、2-乙基咪唑、2-甲氧基丙烯、8-萘内酰亚胺、2-呋喃甲酸甲酯、4'-联苯二羧酸、偏钒酸钠、油酸甲酯、油酸乙酯、高藜芦胺、氯碘甲烷、四甲酸二酐、萘二甲酰亚胺、对二甲氨基甲苯
- 主营：生物活性玻璃、全氟三丁胺、花椒麻素、2-十一酮、二羟基丙酮、光引发剂、乙酸龙脑酯、羟基磷灰石
- 主营：侧柏叶油、当归提取物、益智仁精油、920、羟丙基硅油、侧柏叶精油、茴香提取液、墨旱莲提取物、接骨木提取液
- 主营：尼克酸、十六酸、阻燃剂、tpeg-2400、7647-14-5、7783-03-1、酸性橙、辛癸醇、乙酰肼、诱食剂、川芎油、十八酸、aha化妆、鞣花酸、防染盐、香茅醇、苯甲醇、松油醇、酪蛋白、磷酸氢、哑光粉、滑石粉、拉丝剂、冷除油、氟甲苯
- 主营：凉味剂、聚苯胺、氨基多糖季胺盐、2-氟丙烯酸甲酯、五溴甲苯、巯基丁醇、全氟三丁胺、酒石酸钾、硫代水杨酸
- 主营：全氟三丁胺、二苄叉山梨醇、六氟丙烯二聚体、920、六氟环氧丙烷二聚体、异丙醇铝、纳米勃姆石、二异戊基硫醚、隐色结晶紫、邻菲罗啉
- 主营：苯甲醛、酰亚胺、苯磺酸、cas-50-63-5、异丙基、氨基丙基、试剂医药、化学醋酸、化学试剂、甲基硅基、盐酸羟胺、苯并三唑、苄基丙酮、试剂化工、丙烯酰氯、甲基乙炔、氮杂苯并、二叔丁酯、磷酸二苯酯、化学碳酸钾、二酸二乙酯、酸二异丙酯、二咪唑羰基、中间体化工、医药中间体