Fabrication And Performance Of The Superhydrophobic Epoxy Resin Composite Coating

Lotus leaf has always been an archetype for superhydrophobic surface. Water droplets on lotus leaf can move and roll off easily. This phenomenon, known as “lotus effect”, is attributed to unique nano/micro scale hierarchical structures and hydrophobic epicuticular wax. Inspired by lotus leaf, various techniques have been developed to fabricate superhydrophobic on different substrate materials. Nevertheless, it still remains a great challenge to fabricate superhydrophobic coating with heat-, corrosion- and wear-resistance from inherently hydrophilic materials, due to dual limits of fundamental theory and manufacture technique. Therefore, how to use a simple, inexpensive, rapid, non-polluting preparation process to prepare a superhydrophobic surface with heat-, corrosion- and wear-resistance is a problem which is always plaguing for researchers.In this paper, the simple spraying and electrostatic spraying process have been used to obtain the heat-, corrosion- and wear-resistant functional superhydrophobic and high oleophobic composite coating. Besides that, the key components of coating with optimum content were also explorated. The surface topography, amphiphobic characteristic and the other performance of superhydrophobic coatings are characterized by using contact angle measurement, the electrochemical workstation, SEM, FT-IR, DSC, TGA, XRD and Taber Wear Test Machine. The main contents can be summarized as follows:（1） A simple spraying method was adopt to prepare superhydrophobic TiO₂ with epoxy resin（EP） basal material composite coating, by using EP with modified polyvinylidene fluoride（PVDF） reaction on aluminum plate in order to have a well combination, by using modified TiO₂ particles to establish micro/nano-structure and using low surface energy materials of fluorinated ethylene propylene（FEP） and PDMS to increase the hydrophobicity.The superhydrophobic coatings were prepared via using structural and material features one-step method. It shows that the superhydrophobic coating presents an excellent property with the contact angles for water up to 160°. Not only explore the reaction mechanism analysis during the experiment, but also for its corrosion resistant properties were characterized. The experimental process of reaction mechanism was explored and the coating of corrosion- and heat-resistance were analyzed at the same time.（2） A simple and practicable spraying method was adopt to prepare superhydrophobic composite coating. The pore-forming agent NH₄HCO₃ can decompose（like CO₂, NH₃ and H₂O） and form bubbles, establishing micro/nano porous structure within the coating. M-ZnOare considered to be added in order to increase the mechanical strength and water contact angle. FEP has a good free lower surface energy with self-lubrication by improving the wear resistance and contact angle of coating. EP are used with aluminum plate in order to have a well combination. Using material features and structural prepared superhydrophobic functional coatings. It shows that the composite amphiphobic coating presents an excellent property with the contact angles for water and ethylene glycol up to 160° and 140°,respectively. The coating sintering process of reaction mechanism was explored and the coating of heat- and corrosion-resistance were analyzed at the same time.（3） From research on the combination of environmental protection and utilization of fly ash and the hotspot of superhydrophobic functional coating, it focus on fabrication of functional superhydrophobic coating through a simple electrostatic spraying one-step process.EP are used on aluminum plate in order to have a well combination. By using hydrophobic materials of modified-fly ash particles to establish rough structure and increase the mechanical strength of coating. In order to increase the hydrophobicity, the low surface energy materials of PVDF and FEP are considered to be added. Fabrication of superhydrophobic functional coatings begins from two aspects: microscopic structure and polymer system.