科研之友
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摘要
To prepare a water-based epoxy resin with stable superhydrophobicity, we need to prepare the silica with different particle sizes (micron, submicron, nanometer) based on the alkaline hydrolysis reaction of 3-aminopropyltriethoxysilane (KH550), γ-glycidyloxypropyltrimethoxysilane (KH560) and methyltrimethoxysilane (MTMS). Strawberry-like SiO2 (CM-SiO2) multiple particles with multi-scale effect were then synthesized through the grafting reaction of layer-by-layer assembly. At the same time, as a comparison, the single-coated hydrophobic SiO2 with a smooth surface was prepared. The morphology and structure of the two types of particles were characterized by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR) and high-resolution mass spectrometry (HRMS), while the similarities and differences can also be compared. The self-made modified particles were blended with water-based epoxy resin (WEP) to construct a rough micro-nano structure on the surface of the coating to prepare a water-based epoxy resin coating with superhydrophobic properties. Differential scanning calorimetry (DSC) and thermo gravimetric analyzer (TGA) were applied to characterize the blending performance and heat resistance of coatings. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to quantitatively analyze the characteristics of the coating and its surface morphology. The superhydrophobic properties of the waterborne coatings and the variation of surface energy were characterized by the contact angle test (WCA). The results show that compared with the smooth particles coated with a single layer, the modified SiO2 particles with multi-layer structure migrated to the surface of WEP and constructed the micro-nano structure, which is more conducive to the formation of superhydrophobicity. In addition, the rough coating has an excellent self-cleaning effect and can maintain the stability and durability of the structure in harsh environments, reflecting excellent abrasion resistance and chemical corrosion resistance. ? 2023 Science Press.
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