Overview
2,4-Dihydroxybenzophenone (CAS 881-57-2) is an organic compound belonging to the benzophenone class. It is primarily valued for its ability to absorb ultraviolet (UV) light in the 280-350 nm range, making it a widely used UV stabilizer in industrial and consumer applications. The compound was first developed in the mid-20th century as part of efforts to protect materials from UV degradation. In industrial contexts, this chemical is often referred to by its trade name Benzophenone-1 or UV-0. It serves as a cost-effective alternative to more complex UV absorbers, particularly in applications where broad-spectrum protection isn't required. The global market for this compound is driven by demand from the plastics, coatings, and personal care industries.
Physical and Chemical Properties
2,4-Dihydroxybenzophenone presents as a light yellow crystalline powder at room temperature, with a characteristic mild phenolic odor. Its molecular structure features two hydroxyl groups at the 2 and 4 positions of one benzene ring, which contribute to both its UV absorption capabilities and solubility characteristics. The compound demonstrates good thermal stability, with a melting point range of 142-146°C, making it suitable for incorporation into various polymer processing operations. Its solubility profile shows good dissolution in polar organic solvents like ethanol and acetone, but only limited solubility in water (approximately 0.1 g/L at 25°C). This property influences its formulation in different industrial applications.
Main Applications
The primary use of 2,4-dihydroxybenzophenone is as a UV absorber in polymer systems, particularly in PVC, unsaturated polyesters, and polyurethanes. It helps prevent photodegradation that can lead to discoloration, embrittlement, and loss of mechanical properties in plastic products exposed to sunlight. In the personal care industry, it finds application in sunscreen formulations at concentrations typically below 5%. The compound also serves as an intermediate in the synthesis of more complex UV absorbers and specialty chemicals. Recent applications include use in UV-curable inks and coatings, where it helps control curing rates while providing some degree of finished product protection.
Safety and Storage
While 2,4-dihydroxybenzophenone is considered moderately safe for industrial handling, appropriate precautions should be taken. The compound may cause eye and skin irritation upon direct contact, and inhalation of dust should be avoided. Proper personal protective equipment including gloves and safety glasses is recommended during handling. Storage requirements include keeping the material in tightly sealed containers in a cool, dry place away from strong oxidizers. The compound is stable under normal conditions but may degrade when exposed to strong UV radiation over extended periods. Shelf life typically exceeds two years when stored properly, though manufacturers generally recommend verifying key properties before use in critical applications after prolonged storage.
B2B Procurement Guide
Industrial buyers should specify purity requirements (typically 98% or higher) and request certificates of analysis when procuring 2,4-dihydroxybenzophenone. Key specifications to verify include UV absorbance characteristics, melting point range, and residue on ignition. Packaging options typically range from 25kg fiber drums to bulk quantities for large-scale users. Price fluctuations may occur based on benzene feedstock costs and regional production capacity. Buyers should establish relationships with multiple suppliers to ensure continuity of supply. For formulation-critical applications, consider requesting samples for performance testing before large-volume purchases. Lead times typically range from 2-4 weeks for standard grades, with longer times for customized formulations.
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