Carboxyl coumarone resin and preparation method thereof

The invention provides a hydroxyl coumarone resin and preparation method thereof, and belongs to the field of resin preparation. The hydroxyl coumarone resin is prepared from a polymerizable component-containing mixture and 4-hydroxystyrene or 4-hydroxyl methyl cinnamate or 4-hydroxyl ethyl cinnamate, and the polymerizable component-containing mixture is obtained through distilling a heavy benzene fraction of coal tar; and polymerizable components comprise indene and coumarone, and the mass of 4-hydroxystyrene or 4-hydroxyl methyl cinnamate or 4-hydroxyl ethyl cinnamate is 1-20% of the mass of the polymerizable components. The hydroxyl coumarone resin contains hydroxyl groups, so the hydroxyl value of coumarone resin is substantially improved, and the coumarone resin has good compatibility with polar resins; and the coumarone resin carrying the hydroxyl groups chemically reacts with other components to form interpenetrating network crosslinking, so the performances of coatings and adhesives are further improved.