Fabrication and Evaluation of Nano-TiO2 Superhydrophobic Coating on Asphalt Pavement

Abstract

In order to address water damage of asphalt pavement, reduce the occurrence of water-related potholes, deformation, and other diseases, and improve the performance and service life of the pavement, a nano-TiO2 superhydrophobic coating (PSC) on asphalt pavement was prepared from waterborne polyurethane and nano-TiO2 modified by stearic acid. FT-IR measured stearic acid successfully modified low surface energy substance on the surface of nano-TiO2. The SEM image shows that the PSC has a rough surface structure. The contact angle and rolling angle of the PSC in the contact angle test are 153.5° and 4.7°, respectively. PSC has a super-hydrophobic ability, which can improve the water stability of the asphalt mixture. Although the texture depth and pendulum value have been reduced by 2.5% and 4.4%, respectively, they all comply with the standard requirements. After the abrasion resistance test, the PSC coating still has a certain hydrophobic ability. These results surface PSC coating can effectively reduce water damage on asphalt pavement, and has considerable application value.

Fabrication Techniques of Superhydrophobic Coatings: A Comprehensive Review

“…The sliding angle of the surface must be <10°for a superhydrophobic sample. [22][23][24] In superhydrophobic surfaces, surface roughness is extremely essential. Water droplet behavior can be affected by roughness.…”

“…When compared to the Wenzel model, the sliding angle or contact angle hysteresis is negligible in this scenario. [22][23][24] Various wetting states of liquid with solid surface are given in Figure 2b. [22,26] Water spreadability on a solid surface is known as wettability.…”

“…When compared to the Wenzel model, the sliding angle or contact angle hysteresis is negligible in this scenario. [ 22–24 ]…”

Acrylonitrile Butadiene Polystyrene–SiO2 Composite Nanostructures for Self-Regulated Superhydrophobic Liquid Dosage Systems

“…Superhydrophobic surfaces are widely used in drag reduction, anti-icing, anti-fouling, water manipulation, antibacterial coatings, oil water separation, underwater sensing, and self-cleaning applications. − Such nanostructures are established by creating hierarchical dual-scale roughness on the substrate surface using various techniques such as dip-coating, sol–gel synthesis, chemical etching, plasma etching, electrochemical methods, spin-coating, spray-coating, layer-by-layer methods, and chemical vapor deposition. ,− For practical applications, the fabrication method should be scalable, cost-effective, and straightforward. Spray-coating and dip-coating, two popular methods used for fabricating large-area superhydrophobic surfaces, are suitable for substrates with complex features and geometries. − The first technique involves preparing a precursor solution that is sprayed onto the substrate, while the second involves dipping the substrate into the solution. − In these processes, a binder is either spin-coated over the substrate or dissolved in the solution to ensure better adhesion between the coating and the hydrophobic particle . The binder increases the durability of the coating against mechanical abrasion; however, it sometimes adversely affects the performance of the coating.…”

Fluorine and Siloxane Free Waterborne Near Superhydrophobic Organic Coating Based on Styrene Acrylic Polymer Emulsion through Surface Engineering

“…[22] Waterborne polyurethane has been combined with alumina nanoparticles modified with organic silazane, [23] organic polysiloxane modified diatomaceous earth, [24] and nanotitania modified with stearic acid. [25] A combination of waterborne epoxy resin and silica nanoparticles modified with fluorosilane is reported by Zhang et al [26] Acrylic triblock latex and silica nanoparticles with fluorosilane modification have been used by Samanta et al to prepare SH coating. [27] Le et al have prepared SH surface based on styrene acrylic latex and highly porous polymethylsilsesquioxane particles.…”