UV Absorber UV-9

Chinese name: UV absorber UV-9. English names: Ultraviolet Absorbent UV9; Pectra-sorb UV9; 2-hydroxy-4-methoxybenzophenone. Pinyin: ziwaixianxishouji. Product code: UV-9.

Description: the chemical name is 2-hydroxy-4-methoxybenzophenone. It is a pale yellow crystalline powder with a relative density of 1.324 (25/4℃), a melting point of 65.6℃ (66℃) and a boiling point of 220℃ (2.4 kPa). It dissolves readily in most organic solvents and is insoluble in water. It has low toxicity. It effectively absorbs ultraviolet light with a wavelength of 290~400 nm, but absorbs almost no visible light. It is therefore used as a UV absorber for light-colored rubber articles, and can also be used as a UV absorber for paints and for plastics such as cellulose acetate, cellulose nitrate, polyvinyl chloride, polystyrene, chlorinated polyvinyl chloride and polyester, improving their ageing resistance.

Manufacture: resorcinol is methylated with dimethyl sulfate to give resorcinol dimethyl ether, which is then reacted with benzoyl chloride under anhydrous aluminium chloride catalysis, and the product is obtained by hydrolysis of the reaction product.