| Due to the special wetting properties of the surface,superhydrophobic materials have become one of the research hotspots in the coating direction in recent years.On the one hand,people use its characteristics in anti-icing,self-cleaning,drag reduction and other aspects to design some new superhydrophobic coatings that can meet the harsh service conditions,which has a broad application prospect.Therefore,superhydrophobic coatings have significance worthy of study.On the other hand,the application value of superhydrophobic surface is affected by its weak stability and poor durability,so the preparation process of superhydrophobic coating needs to be optimized.The relationship between the bonding force of superhydrophobic coating and microstructure needs to be further studied.Therefore,in order to improve the stability and durability of ultra-hydrophobic coating,three ultra-hydrophobic coatings are prepared in this article.The microstructure,coating composition and 3D morphology of the sample were analyzed by SEM,EDS and laser confocal microscope.The contact angle,stability,wear resistance and corrosion resistance of the sample coating were tested.The main results are as follows:（1）Using foamed copper as substrate,coating modified nano-Si O2/CNTs particles to obtain superhydrophobic coating.The results show that when the mass mixing ratio of Si O2/CNTs is 2:1,the superhydrophobic effect of the sample is the best,the maximum contact angle at this time is 157.7°,and the rolling angle is 2.6°,When the ratio of modified powder to silane coupling agent is 4:1,the contact angle is the largest,which is 154.34°.When the ratio of modified powder and thickener is 4:1,the contact angle of the sample is the largest,which is 154.4°;After the atmospheric stability test,the contact angle of the sample surface still reaches 152.6°;In the wear resistance test of superhydrophobic samples,after rubbing for 10cm,the contact angle of the sample begins to be less than 150°,and the rolling angle is greater than 10°,and the sample loses superhydrophobicity;Through electrochemical experiments,it is found that the self-corrosion current of the superhydrophobic sample is an order of magnitude lower than that of the original sample,which proves that the corrosion resistance of the sample has been improved;Self-cleaning experiments show that superhydrophobic samples can effectively remove surface contamination.（2）In order to improve the stability of the superhydrophobic coating,three kinds of binders were introduced on the basis of the above,and the modified powder and the binder were mixed together and coated on the foamed copper substrate.Three kinds of binders are nano-Si O2aqueous dispersion,silane coupling agent and thickener,respectively,to prepare a superhydrophobic coating with improved stability.The wettability test found that the contact angle of the sample was the largest when the mass ratio of the modified powder and the nano-Si O2aqueous dispersion was 4:1,reaching 155.7°;In the atmospheric stability experiment,the sample still maintains superhydrophobicity after being placed for 50minutes;In the wear resistance test,the wear resistance of the samples added with silane coupling agent and thickener is slightly better than that of the samples added with nano-Si O2aqueous dispersion.When the friction distance is 50cm-60cm,the contact angle of the sample starts to be lower than 150°;In the corrosion resistance experiment,the results of the samples added with the three binders are not very different,and the corrosion resistance of the superhydrophobic samples is generally better;In the self-cleaning experiment,the superhydrophobic sample can effectively clean the surface carbon powder under the action of water droplets.（3）In order to further improve the stability of the superhydrophobic coating,before the above-mentioned modified particles containing a binder are used,A durable super-hydrophobic coating was prepared by coating the natural curing liquid of PTFE containing Si O2powder with different particle sizes on the foamed copper substrate.The wettability test found that the best contact angle was the nano-Si O2 aqueous dispersion sample.At this time,the contact angle was 154.4°,but with the increase of the particle size of Si O2,the rolling angle of the sample became worse and worse.Over 10°at 50μm;In the atmospheric stability experiment,the superhydrophobicity of the sample does not change much,and it can function for a long time in a stable environment;In the wear resistance test,the samples treated with PTFE solidified liquid can still achieve super-hydrophobic properties after 100cm of friction,and the wear resistance and stability of the coating are improved;In the corrosion resistance experiment,the self-corrosion current of the superhydrophobic sample is reduced by an order of magnitude compared with the foam copper,and the corrosion resistance is improved;In the self-cleaning experiment,the carbon powder on the surface of the superhydrophobic sample was easily cleaned under the action of water droplets. |
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