Preparation And Study Of Superhydrophobic Intelligent Color-Changing Coating Based On Microcapsule Technology

With the continuous research and expansion of superhydrophobic materials,the related research has gradually developed from single-function superhydrophobic properties to multifunctional superhydrophobic surfaces.Advanced superhydrophobic surfaces have been able to achieve intelligent response,such as the change of wettability by external stimuli such as light,heat and magnetic force,while color change,as the most intuitive response change in daily life,is not yet studied in superhydrophobic intelligent color response.Therefore,in this paper,a superhydrophobic material with intelligent color change response is prepared by introducing color change responsive microcapsules.In the preparation process,the optimal ratio of micron and nanomaterials is optimized to achieve controllable preparation of binary micro/nanostructures,and their properties and potential applications are investigated.The main elements are as follows:(1)The coating was prepared by using perfluorooctyltriethoxysilane to modify the thermochromic microcapsules and silica particles,mixed with room temperature vulcanized silicone rubber,and constructed a micro/nano layered and sparse porous surface structure by spraying method with a contact angle of 161° and a rolling angle of 5° to achieve a superhydrophobic state,and exhibited adaptability to a variety of substrates.The coating maintains its superhydrophobic state and fast color response with high temperature reversible color change response and stability after 72 h UV irradiation,50 times sandpaper abrasion at 8.9KPa pressure,250 times tape peeling and chemical solution attack.And it has potential application value in the fields of waterproof self-cleaning,ambient temperature monitoring and insulation protection.(2)The superhydrophobic fabric with dual color change response was prepared by introducing photo/thermochromic microcapsules and silica particles to form a double cross-linked network with vinyl polydimethylsiloxane and vinyltriethoxysilane.The experimental results show that the micro-nano particles of this coating form a triple micro-nano structure with the inherent roughness of the fabric,and the polydimethylsiloxane provides low surface energy and self-healing ability,which integrates to enhance the superhydrophobicity and durability of the coating from multiple perspectives.As a result,the prepared samples maintain superhydrophobicity and self-healing properties after plasma etching even after various damages(e.g.sandpaper abrasion,corrosive liquid erosion,ultrasonic treatment,UV irradiation,and water stream impact).Further,the color response based on four-color switching is designed by photo/thermochromic microcapsules,and the excellent color change rate and reversibility have wide application prospects in the fields of tactile imaging,writing records,multi-color patterns and anti-counterfeit labels.In summary,this paper broadens the research scope for the application of smart color-changing responsive materials by introducing smart color response into superhydrophobic surfaces,enriches the development of functional superhydrophobic surfaces,and provides a certain reference for the intelligent development of superhydrophobic interfaces.