▎ 摘　　要

NOVELTY - Automotive glass antifog coating comprises graphene oxide layer, a crosslinked layer and an antifogging layer formed on the surface of the graphene glass substrate in order from inside to outside. The oxidized graphene layer is formed by oxidation of a graphene structure on the surface of a graphene glass substrate. The crosslinked layer is formed by connecting the oxidized graphene layer with the first chemical bond force. The antifogging layer is formed by the spray coating curing of the composite coating and the second chemical bonding force of the crosslinked layer. USE - Automotive glass antifog coating. ADVANTAGE - Automotive glass antifog coating has oxidized graphene layer, the crosslinked layer and the composite coating layer stably and permanently attached to the glass surface in a chemical bonding manner, where the curing film is formed quickly and the contact angle of the coating layer to water is 3 degrees , hardness of up to 2H, the transparency of up to 95% or more, with a lasting anti-fog effect, good water resistance, with excellent mechanical properties, low cost and wide application. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing crosslinked layer, which involves: (A) taking 60-70 pts. wt. HDI trimer and 1-3 pts. wt. dibutyltin dilaurate and adding to the reactor, heating to 55-60 degrees C and maintaining at a constant temperature; (B) stirring, where isocyanate groups are reacted with hydroxyl groups; (C) adding polyethylene glycol monomethyl ether dropwise at a molar ratio of 5-7: 1, and the hydrophilic modified polyisocyanate having a number average molecular weight of 500 is obtained after 2 to 3 hours of constant temperature reaction; (D) dispersing the hydrophilic modified polyisocyanate in a mixed solvent of dimethylformamide and water in the mass ratio of 1: 1-2 to form 60-75 wt.% polyisocyanate dispersion liquid; (E) immersing graphene glass substrate on which the oxidized graphene layer is formed in the 60-75 wt.% polyisocyanate dispersion, and adding 1-2 drop catalyst of dibutyltin dilaurate; (F) heating mixture at 60-65 degrees C under hypothermic ultrasound for 1-1.5 hours; and (G) cooling to room temperature and drying to obtain a crosslinked layer.