The invention discloses a
fluoride-free oil-proof agent for paper pulp molding and a preparation method thereof, and belongs to the technical field of paper pulp molding materials. The
fluoride-free oil-proof agent is prepared from the following raw materials in parts by weight: 40 to 60 parts of long-chain
alkane, 10 to 20 parts of short-chain
alkane, 10 to 15 parts of film-forming agent, 5 to 10 parts of modified
polysilazane, 3 to 7 parts of nano material, 1 to 3 parts of
chitosan derivative, 0.1 to 3 parts of cross-linking agent, 6 to 10 parts of filler and 60 to 100 parts of
solvent. Wherein the modified
polysilazane is prepared by reacting
polysilazane with methyltriethoxysilane and 3-halogenated propylene under the action of a catalyst and
chloroplatinic acid isopropanol. The preparation method comprises the following steps: mixing long-chain
alkane, short-chain alkane and a
solvent, and heating to react; other components are mixed and subjected to ultrasonic treatment; and mixing the two mixtures under ultrasonic and pressure conditions. The
fluoride-free oil-proof agent provided by the invention is environment-friendly and safe, has excellent oil-proof performance, and is suitable for surface treatment of paper pulp molded products.