Preparation method and application of modified hydroxypropyl silicone oil

The invention relates to the technical field of coating additives, and discloses a preparation method and application of modified hydroxypropyl silicone oil, and the preparation method comprises the following steps: (1) ultrasonically dispersing nano silicon dioxide in liquid cage-type octa-epoxy silsesquioxane, dropwise adding into a mixed solution of 2, 2-dimethylolbutyric acid and a graphene oxide ethanol solution, and stirring to obtain a mixed solution; carrying out heating reaction while stirring; (2) adding dopamine and sodium phthalate into a product obtained in the step (1), and continuously heating and reacting in an inert atmosphere; and adding dopamine-coated nano silicon dioxide and hydroxypropyl silicone oil, and continuously reacting to obtain the modified hydroxypropyl silicone oil. The modified hydroxypropyl silicone oil disclosed by the invention can maintain long-acting anti-doodling and anti-fouling performance, and has relatively good wear resistance, strength and weather resistance; the