Preparation Of Ti-based Photosensitive Filler And Its Application In Protective Coating

With the development of modern industrialization,the requirements for equipment in industrial production process are becoming higher and higher,and metal corrosion has gradually become the main problem limiting industrial progress.The surface of equipment working continuously for a long time will inevitably be damaged by corrosive media,which will change its structural framework to a certain extent,resulting in huge economic losses and directly threatening people’s safety.To solve the problem of metal corrosion,this paper proposes to improve the compactness of the coating by adding functional fillers to the polyurea resin,and design and prepare functional organic protective coatings with high shielding and photocatalytic properties.In addition,the protective ability of the coating is also tested under high pressure CO₂ conditions.Firstly,TiO₂-ZnO heterojunction is formed by combining zinc oxide as a cocatalyst and titanium dioxide nanoparticles with photocatalytic properties,which is loaded on the surface of graphene oxide,and F/T-Z-G functional filler is successfully prepared by fluorination modification.The F/T-Z-G functional filler was dispersed into the polyurea resin by spraying method to prepare the F/T-Z-G polyurea coating.The F/T-Z-G polyurea coating can be controlled by adjusting the UV irradiation time to achieve both hydrophilic surface and efficient corrosion resistance.The EIS results show that the barrier capacity of the 20%F/T-Z-G polyurea coating is significantly higher than that of the other coatings.After 120 days immersion in 3.5wt%Na Cl solution,the impedance value can still reach 10¹⁰Ω·cm².Secondly,high light response black TiO₂（B-TiO₂）was prepared by reducing TiO₂ with Na BH₄,and then B-TiO₂ was effectively combined with mica（Mica）by hydrothermal method.A multifunctional filler with both corrosion resistance and photocatalysis is prepared,which will be fluorinated to make it have good water repellency;Improve the dispersion of filler in polyurea resin after illumination and spray it on the substrate surface.The EIS results show that the impedance value of 20%UV/F/B-T/M/polyurea coating can still reach 10¹¹ωcm² after immersion in 3.5wt%Na Cl solution for 150 days.Finally,B-T/C/M composite filler was successfully prepared by the combination of thermal reduction and hydrothermal method,and F/B-T/C/M photocatalytic filler was obtained by hydrophobic modification.The optimum ratio of F/B-T/C/M photocatalysis filler was 1:1by XRD,SEM,FTIR,UV and other characterization.The F/B-T/C/M=1:1 filler without photocatalysis and the UV/F/B-T/C/M=1:1 filler after photocatalysis were dispersed in the polyurea resin.The coating was covered on the steel plate surface by spraying method,and the shielding performance of the sample coating was tested.The results shows that the UV/F/B-T/C/M=1:1 filler after photocatalysis has a stronger binding ability with the resin,further improving the anti-corrosion shielding of the coating.