Preparation and performance study of EP/PDMS/MMT-SiO2-STAB superhydrophobic composite coating
Using the sol-gel method,SiO2 with good internal interfacial force was in-situ grown on the surface of sodium montmorillonite(MMT)to obtain MMT-grafted SiO2(referred to as MMT-SiO2 particles).The MMT-SiO2 particles were then subjected to intercalation hydrophobic modification using trimethyloctadecylammonium bromide(STAB),a cationic modifier,to obtain modified MMT-grafted SiO2(referred to as MMT-SiO2-STAB composite particles).The MMT-SiO2-STAB composite particles were used as a reinforcing phase,and polydimethylsiloxane-modified epoxy resin(EP/PDMS)was used as the matrix to prepare the EP/PDMS/MMT-SiO2-STAB composite coating.The morphology,structure,and contact angle of the composite coating were analyzed and tested by scanning electron microscopy(SEM),X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),and contact angle goniometer.The results showed that after the ion exchange reaction between STAB and MMT-SiO2,STAB adhered to the edges of MMT.As the amount of STAB increased,the interlayer spacing of MMT first increased and then decreased.The larger the interlayer spacing of MMT in MMT-SiO2-STAB,the better the compatibility between the reinforcing phase and the resin,effectively improving the dispersion stability of the reinforcing phase in the matrix and the wear resistance of the composite coating.The prepared composite coating exhibited a contact angle of(153.7+1.2)° and a rolling angle of(8.9+0.6)°,indicating significant superhydrophobic characteristics.
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