Overview
2,2'-Dihydroxybenzophenone (2,2'-DHBP) is an organic compound belonging to the benzophenone family, characterized by its two hydroxyl groups attached to the benzophenone structure. It is primarily valued for its ability to absorb ultraviolet (UV) light, making it a key ingredient in UV stabilizers for various industrial applications. The compound is synthesized through the Friedel-Crafts acylation of phenol derivatives, resulting in a pale yellow crystalline powder. Its molecular structure allows it to dissipate absorbed UV energy as heat, protecting materials from degradation. This property is particularly useful in industries requiring long-term material stability under sunlight exposure.
Physical and Chemical Properties
2,2'-Dihydroxybenzophenone exhibits a melting point of 144-146°C and is soluble in common organic solvents such as ethanol, acetone, and toluene. Its insolubility in water makes it suitable for hydrophobic applications. The compound's UV absorption peaks in the 280-350 nm range, effectively shielding materials from UV-B and UV-A radiation. Thermal stability is another notable property, allowing it to withstand processing temperatures in plastics and coatings. However, prolonged exposure to high temperatures may lead to decomposition, necessitating careful handling during manufacturing.
Main Applications
The primary use of 2,2'-DHBP is as a UV absorber in plastics, including polyvinyl chloride (PVC), polyethylene (PE), and polypropylene (PP). It prevents yellowing and brittleness caused by UV radiation, extending the lifespan of plastic products such as outdoor furniture, automotive parts, and packaging materials. In coatings and adhesives, it enhances durability against weathering. Additionally, it finds niche applications in cosmetics and personal care products, where it acts as a sunscreen agent. Its effectiveness in low concentrations makes it a cost-efficient additive for manufacturers.
Safety and Storage
While 2,2'-Dihydroxybenzophenone is not classified as highly hazardous, precautions are necessary to avoid skin and eye irritation. Personal protective equipment (PPE), including gloves and goggles, should be worn during handling. Adequate ventilation is recommended to minimize inhalation risks. Storage should be in tightly sealed containers, away from direct sunlight and moisture. The compound is stable under normal conditions but may degrade if exposed to extreme heat or incompatible substances. Always refer to the material safety data sheet (MSDS) for specific guidelines.
B2B Procurement Guide
When procuring 2,2'-DHBP, buyers should prioritize suppliers with certifications such as ISO 9001 or REACH compliance. Key specifications to verify include purity (typically 98-99%), CAS number (835-11-0), and batch consistency. Requesting samples for testing is advisable to ensure compatibility with intended applications. Prices vary based on order volume and purity levels, with bulk purchases often attracting discounts. Lead times and logistics options should also be considered, especially for international shipments. Establishing long-term supplier relationships can ensure stable pricing and reliable quality.
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