Preparation and Properties of Fluorine/Silicone Synergistically Modified UV-Curable Amphiphobic Coating with Good Transparency and High Hardness
A fluorine-modified polysulfhydryl crosslinking agent(FPETMP)was synthesized from perfluorooctyl ethyl acrylate(17F)and tetrakis(3-mercaptopropionic acid)pentaerythritol ester(PETMP)by Michael addition reaction.Infrared spectroscopy and proton nuclear magnetic resonance spectrum characterization confirm that FPETMP was successfully modified by 17F,and there are still unreacted mercapto groups in FPETMP.FPETMP was mixed with PETMP,(acryloxy)methyl silicone alkyl homopolymer(APMS)and a mercapto-ene click reaction was initiated under UV curing to obtain a transparent amphiphobic coating.The effect of the amount of FPETMP on the hydrophobic and oleophobicity,transparency and mechanical properties of the coatings was studied.The results show that as the content of FPETMP increases,the hydrophobic and oleophobic properties of the coatings also increase.However,when the amount of FPETMP is too high,the compatibility of the system decreases,and the transparency and pencil hardness of the coating also deteriorate.When the mass fraction of FPETMP is 20％,the contact angles of the coating to water and hexadecane are 116.5° and 75.6°,respectively,and the hardness of the coating is relatively high,with a pencil hardness of 7H.The coating exhibits good optical transparency and the overall performance of the coating is the best.
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