Aryl alkyl alcohol-polypropylene oxide-polyoxyethylene block copolymer as well as preparation method and application of block polymer

The invention discloses an aryl alkyl alcohol-polypropylene oxide-polyoxyethylene block copolymer, which has a structure in a general formula I. The preparation method comprises the following steps: alkylating alkenyl carboxylate and aromatic hydrocarbon to obtain aryl alkyl carboxylic acid; esterifying aryl alkyl carboxylic acid and methanol to obtain aryl alkyl carboxylic methyl ether; alkylating alkyl carboxylic methyl ether and aromatic hydrocarbon to obtain aryl alkyl carboxylic methyl ether; carrying out hydrogenation reduction on the aryl alkyl carboxylic methyl ether to form aryl alkyl alcohol; carrying out ring-opening reaction on the aryl alkyl alcohol and epoxypropane to obtain aryl alkyl alcohol polyoxypropylene ether; and carrying out ethoxylation reaction on the aryl alkyl alcohol polyoxypropylene ether and ethylene oxide to obtain the aryl alkyl alcohol-polypropylene oxide-polyoxyethylene block copolymer. The aryl alkyl alcohol-polypropylene oxide-polyoxyethylene block copolymer can be applied to the fields such as residual oil emulsification, thickened oil viscosity reduction, heavy oil pour point depression, nano emulsion preparation, tertiary oil recovery, daily-use chemical industry and the like.