Ureido modified organic silicon sealant and preparation method thereof

The invention discloses a ureido modified organic silicon sealant and a preparation method thereof, and the ureido modified organic silicon sealant is prepared from the following components in parts by weight: 100 parts of amino-terminated modified alpha, omega-dihydroxy polydimethylsiloxane, 5 to 25 parts of fumed silica, 5 to 15 parts of isocyanate and 800 to 900 parts of solvent, wherein the amino-terminated group of the amino-terminated modified alpha, omega-dihydroxy polydimethylsiloxane is a primary amino group; the isocyanate comprises isocyanate A and isocyanate B, the isocyanate A is one or a combination of isophorone diisocyanate and dicyclohexylmethane diisocyanate, and the isocyanate B is one or a combination of toluene diisocynate, diphenylmethane diisocyanate and hexamethylene diisocyanate. The ureido modified organic silicon sealant can be self-healed at room temperature, and can well solve the problem that the sealing performance cannot be guaranteed after an organic silicon sealant product is