Preparation Of SiO₂/Fluorine-containing Acrylate Composite Emulsion And Application In Superhydrophobic Properties

The development of superhydrophobic surface is mainly inspired by the surface self-cleaning performance of natural organisms such as lotus leaves.Through research,it is found that the perfect hydrophobicity of superhydrophobic surface is mainly due to the joint action of micro-nano rough structure on the surface and low surface energy materials modified on the surface.Because of this special performance,superhydrophobic surface has significant applications in the fields of anti-corrosion,anti-fouling,self-cleaning,anti-ice,anti-fog and oil-water separation.Researchers have tried a variety of methods,including sol-gel,etching,layer-by-layer self-assembly,and templating,to artificially obtain structures similar to lotus leaf surfaces.However,these methods are not only too complicated and costly to operate,but also not convenient for mass preparation or application in actual production.Therefore,it is very important to find a simple and low-cost preparation method.This paper selects the method of spraying organic-inorganic composite coating to prepare superhydrophobic coating,which provides a certain method for the actual application of superhydrophobic surface.Firstly,fluorinated polyacrylate emulsion with low surface energy was synthesized by emulsion polymerization,and its structure was characterized by infrared test.The conversion rate and the properties of the film was affected by the initiator and monomer ratio and the mechanism was investigated of curing agent improving the water resistance of the film.We apply the emulsion with the best ratio on the surface of glass,a transparent coating with low water absorption and good brightness is obtained after curing.Second,the prepared fluorine-containing acrylate emulsion was used as organic coating,and it was mixed with KH-550 modified SiO₂nanoparticles as filler to form a composite coating.By investigating the influence of the amount of SiO₂nanoparticles in the coating on the contact Angle of the coating,explore the influence of KH-550 on the morphology and performance of the coating,and finally determine the optimal formulation of the coating.The modified coating has the excellent strength and adhesion of traditional coating and greatly improves the mechanical properties of superhydrophobic coating.We prepare the superhydrophobic surface on the glass substrate by spraying the best performance coating.According to the contact Angle instrument test,the contact Angle CA of the spraying surface is about 154.7°,and the rolling Angle is 4.2°.Spraying method can quickly obtain superhydrophobic surface on a variety of materials,and is not limited by surface shape,which has a certain guiding significance in practical applicationSince the superhydrophobic coating prepared in this work has excellent superhydrophobic properties,we try to the ice resistance test.The results show that the freezing time of water droplets on superhydrophobic surface is significantly longer than that on non-superhydrophobic surface,which provides a theoretical basis for the preparation of anti-ice coating.