Study On Superhydrophobic Films Fabrication Based On Uv Micro-imprint Technology

Superhydrophobic materials have broad application prospects in transportation,construction,medical treatment and daily life due to their unique self-cleaning effect.It become a research hotspot.In recent years,researchers have prepared superhydrophobic surfaces by various methods.But these processes have some shortcomings,such as expensive equipment and materials,long production cycle and unrepeatable access.These methods have some limitations.UV micro-imprint forming process is a new processing method developed in recent years.It has the advantages of high efficiency,low cost and high precision.The liquid UV curing material is used for forming process.It enables rapid prototyping of microstructures at room temperature and low pressure.In this paper,superhydrophobic films with microstructures were successfully prepared by UV micro-imprint process.The effects of the composition of UV-curing materials,the microstructure of the template and the preparation process on the hydrophobic properties of the film products during the forming process were explored.The effect of material characteristics and template geometry characteristics on the filling effect of microstructure in the process of micro-imprint was investigated by finite element analysis.The main work include the following aspects.1.A kind of UV-curing material suitable for UV micro-imprint forming process was developed.The effects of different formulations(monomer type and content)on the mechanical properties,curing time and hydrophobic properties of the materials were studied.By optimizing the material formulation and adding organic fluorine resin and organic silicone resin in the UV curing system,the water contact angle of the film was increased from 72°to 100°.The hydrophobicity of the film was improved.2.We fabricated a microcolumn array mother board by photolithography.On this basis,the soft template of polydimethylsiloxane(PDMS)was fabricated.Microcolumn array structures were successfully fabricated on the surface of films by UV micro-imprint process.The contact angle of the product film surface reaches about 123°,which is about 23°higher than that of the film product without microstructures.And the product reproduction accuracy is high.3.In this paper,the natural lotus leaf was used as the mother board to prepare the PDMS soft template..The micro-nanostructure of lotus leaf was successfully reproduced on the surface of film products by UV micro-imprint process.The surface contact angle of the film can reach 153.5°,which possesses superhydrophobic properties.The effects of illumination time,illumination intensity and pressure on the hydrophobicity of the products in the process of UV micro-imprint were also studied in this paper.The optimum process parameters were obtained,and the superhydrophobic film products had good durability and corrosion resistance.4.The effects of material properties and template microstructure geometry on the filling behavior in the process of UV micro-imprint was studied by using finite element analysis method.This will provide some theoretical guidance for future experiments.It is concluded that the larger the contact angle between the UV curing material and the substrate,the better the filling of the UV curing material into the microstructure cavity.The filling ratio decreases with the increase of the contact angle between the curing material and the template.Low-viscosity UV curing material is more favorable for filling into microstructure cavity than high-viscosity UV curing material.Large aspect ratio of microstructures makes filling of UV curing materials more difficult.