Modified water-based resin and preparation method thereof

The invention provides modified water-based resin and a preparation method thereof. The modified water-based resin is characterized by containing the following raw materials in parts by weight: 30-60parts of isophorone diisocyanate, 50-100 parts of polyether polyol, 5-10 parts of dimethylolpropionic acid, 10-20 parts of a fluorine-containing chain extender, 5-10 parts of a neutralizer, 10-20 parts of hydroxyethyl acrylate, 210-470 parts of deionized water, 20-50 parts of methyl methacrylate, 20-50 parts of n-butyl acrylate and 2-8 parts of acrylic acid(N-methylperfluorohexylsulfonamido)ethylester, wherein polyether polyol is one or mixture of more of polyether diol N210 and polyether diol PTMG1000; and the neutralizer is triethylamine. The modified water-based resin has a good film forming property, and a contact angle between a cured substance and water reaches 93-105 degrees. A detection result of a GB/T1040-1992 plastic tensile property testing method shows that the tensile strength reaches 7MPa-13MPa, and