The application discloses a preparation method of an
aromatic hydrocarbon modified high-
softening-point hydrogenated
petroleum resin, and steps are as follows: 1, a part of
dicyclopentadiene monomer is mixed with a
polymerization solvent, and then the temperature is increased to 130-210 DEG C, and then a
mixed solution of
aromatic hydrocarbon monomer and the rest of
dicyclopentadiene monomer is added dropwise, when the dropwise addition is completed, the temperature of the
system is 220-240 DEG C; 2, the temperature is continuously increased to 250-350 DEG C, and then heat
polymerization reaction is carried out for 1-6 hours to obtain a first reaction solution; 3, the first reaction solution is reduced pressure
distillation for 1-3 hours to remove the
polymerization solvent and unreacted monomer, and then a basic
polymer resin is obtained; 4, the basic
polymer resin and a hydrogenation catalyst are added into a hydrogenation
solvent, and then stirring is carried out until the mixture is uniform; 5,
hydrogenation reaction is carried out for 1-6 hours to obtain a second reaction solution; 6, the second reaction solution is reduced pressure
distillation for 1-3 hours to remove the hydrogenation solvent and part of oligomers, and then a hydrogenated
petroleum resin is obtained. Compared with the prior art, the hydrogenated
petroleum resin prepared by the application can be used as a stiffening agent in the field of BOPP films.