The invention discloses a bio-based modified
rosin resin preparation method, which comprises: placing
rosin in a container, introducing
carbon dioxide, heating and stirring until the
rosin is molten, cooling, sequentially adding
phenol and
solvent oil, stirring, adding a catalyst, and heating to obtain a mixed material liquid; adding water into the mixed material liquid, stirring and washing, introducing
carbon dioxide after washing, heating to evaporate out the
solvent oil, heating the mixed material liquid to 200 DEG C, adding an
antioxidant,
pentaerythritol and
octanol, stirring and mixing, heating to 260-280 DEG C, carrying out constant-
temperature treatment, cooling to 200-220 DEG C, adding the
antioxidant and nano-hydroxyapatite, stirring, cooling to 200-220 DEG C, adding the
antioxidant and nano-hydroxyapatite, and carrying out uniform mixing, so as to obtain a finished product. And discharging, cooling, filtering and granulating to obtain the bio-based modified rosin resin. The rosin is used for replacing
turpentine to produce the rosin modified phenolic resin,
formaldehyde is not added in the production process, volatile organic compounds are not generated after the product is applied, and the rosin modified phenolic resin is environment-friendly and safe and can be applied to the field of automobile adhesives.