In order to improve the durability of superhydrophobic coatings,in this work,we designed a bottom-up coating system of"substrate-viscous self-healing polymer-hydrophobic particle",thereby the superhydrophobic surface with self-healing function was successfully fabricated:Hyperbranched polydimethylsiloxane(HB-PDMS)with abundant hydrogen bonds as viscous self-healing polymer;Nano-SiO2 was hydrophobic modified by myristic acid(MA)as hydrophobic particles to construct rough surface structure.When the mass ratio of MA to SiO2 is 1∶1 and the modification time is 3 h,the superhydrophobic coating prepared has a contact angle of 152.61° and a slid-ing angle of 1.9°,which has excellent antifouling performance.The coating can be healed by simple heat treatment after being scratched by the blade,and has excellent self-healing performance.Compared with pure aluminum,the composite coating has better anti-corrosion performance and the corrosion inhibition efficiency can reach 87.53%.In addition,After 5 tape peel tests,linear wear tests with a wear length of 30 cm,ultrasonic shock tests of 50 min,10 temperature differential cycles and 24 h ultraviolet irradiation,the contact angle remained above 150°,indicating that the coating has good mechanical stability and weather resistance.This study provides a new effective strategy for the preparation of self-healing superhydrophobic coatings,which is expected to be applied in the field of build-ing antifouling.
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