Preparation Of Transparent Superhydrophobic Surface And Its Application In Intelligent Monitoring Of Unmanned Mines

In recent years,China’s industrialisation process has accelerated,the total demand for coal resources has increased,and the mining volume of coal mines has increased year by year,and has shifted from shallow or medium-deep wells to deep mines,leading to an increase in the danger of coal mining.As the intelligent construction of China’s coal mines accelerates,unmanned mine technology will be applied to the coal mining and transportation process.However,due to the high temperature and humidity underground,the lens surface of the vision equipment is easily contaminated by coal dust,which affects the quality of video and image information feedback.To address this problem,this paper will use an adhesive method,combined with a layered spraying process,to prepare a transparent superhydrophobic surface with a protective ’sandwich’ structure and apply it to the lens surface.The effect of different silicone adhesive content,silica content and number of silica coating layers on the superhydrophobicity,stability and translucency of the surface will be investigated to obtain a better proportioning scheme.On the basis of this,the feasibility of the better performance superhydrophobic surface for underground application is experimentally verified by simulating the working environment of a mine.The experimental results were post-processed using the Open CV image processing module,and then the applicability of the superhydrophobic surface was verified through anti-fogging experiments on the lens surface and hydrophobic experiments on the ceramic surface.The main conclusions in the paper are.(1)A layered spraying process was used in the paper to construct the superhydrophobic surface,from bottom to top,with a silicone adhesive layer,a silica layer,and a UV photosensitive adhesive protective layer,and the composite coating has a strong mechanical durability compared to the superhydrophobic surface without the protective coating.At the same time,the layered spraying process proposed in the paper is simple,easy to operate and suitable for industrial mass production.(2)The silicone adhesive content is one of the most important factors affecting the translucency and hydrophobicity of superhydrophobic surfaces.In this paper,the content of silicone adhesive in the preparation of superhydrophobic surfaces was adjusted through singlefactor experiments,and the final conclusion was obtained: the superhydrophobic surfaces prepared with a silicone adhesive mass fraction of 2% and at a silica mass fraction of 2% had the best performance,with a contact angle of 161° and a rolling angle of 3°;in the sandpaper friction experiments,the superhydrophobic surfaces could maintain a contact angle of 105° within a distance of 1.5 m from the sandpaper friction.In the thermal and chemical stability tests,the superhydrophobic surface maintained good superhydrophobicity in hot water at 80°C for 100 min and in aqueous flowing acetic acid solution at p H=2.4 for over 100 min.(3)The number of layers of silica sprayed,the type and mass fraction of dispersant can have a large impact on the superhydrophobic surface performance.In the dispersant settling experiments,it was found that the modified silica nanoparticles were best dispersed in anhydrous ethanol,and the best overall performance of the superhydrophobic surface was achieved when the mass fraction of silica reached 2% and one layer was sprayed,with a surface translucency of80.7%,a contact angle of 161° and a rolling angle of 3°,as well as showing good self-cleaning properties in the self-cleaning experiments.(4)The harsh working environment of the downhole camera was simulated in the laboratory environment,comparing the clarity of images taken by ordinary glass lens and superhydrophobic glass lens in actual application,and it was found that the superhydrophobic lens could still maintain high clarity in the harsh experimental environment.The images from the experiments were processed using the image processing function of Open CV and accurate edge contours were successfully extracted from them.Finally,the feasibility of applying this superhydrophobic surface to lenses and ceramic surfaces was demonstrated.The superhydrophobic technology has an important role to play in the development of unmanned mines and the implementation of underground intelligence.The superhydrophobic surface preparation method described in this paper is economical,non-polluting and stable,and can provide a strong guarantee for the development of machine vision in intelligent mining equipment.This thesis has 36 figures,3 tables and 60 references.