Overview
Benzoin, chemically known as 2-hydroxy-2-phenylacetophenone, is an organic compound derived from the condensation of benzaldehyde. It is widely recognized for its role as a photoinitiator in UV-curable coatings and adhesives. The compound is also used as an intermediate in the synthesis of various pharmaceuticals and fragrances. Benzoin is typically produced through the benzoin condensation reaction, which involves the dimerization of benzaldehyde in the presence of a cyanide catalyst. Its unique chemical structure makes it valuable in multiple industrial applications, including the production of resins and polymers.
Physical and Chemical Properties
Benzoin is a crystalline solid with a melting point of 137-139°C and a boiling point of 344°C. It has a density of 1.31 g/cm³ and is soluble in organic solvents like ethanol, ether, and acetone, but only slightly soluble in water. The compound exhibits photoinitiating properties, making it essential in UV-curing processes. Its chemical stability under normal conditions and reactivity under UV light are key characteristics. Benzoin's ability to generate free radicals upon UV exposure enables its use in polymerization reactions, particularly in coatings and inks.
Main Applications
Benzoin's primary application is as a photoinitiator in UV-curable coatings, adhesives, and inks. It initiates polymerization when exposed to ultraviolet light, leading to rapid curing of the material. This property is highly valued in industries requiring fast-drying and durable finishes. Additionally, benzoin serves as an intermediate in the synthesis of pharmaceuticals, such as antihistamines and antiseptics. In perfumery, it is used to create fragrances with a balsamic aroma. Its versatility extends to organic synthesis, where it acts as a precursor for more complex molecules.
Safety and Storage
Benzoin should be handled with care to avoid inhalation, ingestion, or skin contact. Proper personal protective equipment (PPE), such as gloves and goggles, is recommended. The compound should be stored in a cool, dry, and well-ventilated area, away from direct sunlight and incompatible materials. In case of exposure, immediate measures such as rinsing with water or seeking medical attention may be necessary. Safety data sheets (SDS) provided by suppliers should be consulted for detailed handling and emergency procedures.
B2B Procurement Guide
When procuring benzoin, buyers should verify the CAS number (119-53-9) and purity specifications to ensure product quality. Reputable suppliers should provide material safety data sheets (MSDS) and certificates of analysis (CoA). Price ranges vary based on purity and quantity, typically between $20-$50 per kg. Bulk purchases may offer cost advantages. Buyers are advised to assess supplier reliability, delivery timelines, and compliance with regulatory standards such as REACH or FDA, depending on the intended application.
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