Preparation method of ultraviolet light absorber UV-1600 intermediate

The invention provides a preparation method of an ultraviolet light absorber UV-1600 intermediate, and particularly relates to a preparation method of the ultraviolet light absorber UV-1600 intermediate, namely 2,4-bis(4-xenyl)-6-(2,4-dyhydroxy)phenyl-1,3,5-triazine. The method comprises the steps: a Friedel-Crafts alkylation reaction is conducted by taking cyanuric chloride and biphenyl as raw materials, taking aluminum trichloride as a catalyst, and taking HCl gas as a cocatalyst, 2,4-bis(4-xenyl)-6-chlorine-1,3,5-triazine is obtained, then the 2,4-bis(4-xenyl)-6-chlorine-1,3,5-triazine andresorcinol generate a Friedel-Crafts reaction, and the target product is obtained. According to the preparation method of the ultraviolet light absorber UV-1600 intermediate, the HCl gas is taken as the cocatalyst, thus the catalytic activity of a catalytic system is greatly improved, the yield of the product can be greatly increased, and a new process route is provided for industrial production of UV-1600. 本发明提供一种紫外线吸收剂U