Development of Self-cleaning and Scratch-resistant Coating on Surface of Optical COD Sensor Window
It is easy for the window of optical chemical oxygen demand(COD)sensor working in sewage to attach dirt and microorganisms,which leads to the decrease of light transmittance of glass and the shortening of its service life.In this paper,aiming at this problem,a self-cleaning and scratch-resistant transparent coating was designed and prepared on the surface of sensor window,which could prevent bacteria,algae and other organisms from adhering onto the glass surface,thus ensuring the detection effect.Two fluorine-containing polymer emulsions,F46 and PFA,were selected as precursors.Epoxy resin was added to improve the adhesion between the coating and glass substrate,and the scratch resistance of the coating was improved.In this process,the effects of the solid content of the composite system and the amount of epoxy resin on the adhesion,light transmittance,hydrophobicity and scratch resistance of the coating were systematically studied.The results showed that when the mass ratio of epoxy resin to fluorine-containing polymer solid was 1∶19,the prepared PFA-based composite coating was not only transparent and self-cleaning(the water contact angle up to 127.8°),but also had excellent scratch resistance.Furthermore,the antibacterial effect of PFA-based composite coating with silver nanoparticles was also investigated.The preliminary experiment confirmed that the antibacterial rate of the coating reached 41.9％.
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