Regional wettability differential type coating and preparation method thereof

The invention discloses a regional wettability differential type coating and a preparation method thereof. The preparation method comprises the following steps that (1) polyanions are modified by using 4-azidoaniline hydrochloride; (2) a substrate is soaked in a polycation aqueous solution for 1-60 minutes, is taken out, is put into a modified polyanion aqueous solution to be soaked for 1-60 minutes and then is taken out; (3) the steps are repeated, a coating body with a plurality of cycles of sedimentation are prepared on the substrate; (4) the surface of a coating material is covered with aphotomask with a pattern, and local cross-linking reaction is initiated by irradiating ultraviolet light; (5) the coating material subjected to local cross-linking is placed in a humid environment ormakes contact with water; and (6) the coating body is subjected to silanization treatment and then is spin-coated with lubricating oil so as to obtain the regional wettability differential type coating. According to the coatin