Preparation of fluorinated acrylate coating with high albedo and its cooling effect on asphalt mixture

With regard to the high-temperature diseases of the asphalt pavement, an environment-friendly emulsion with high albedo was considered for reducing the pavement temperature. Firstly, the effect of types and dosage of the fluorine monomer on properties of the emulsion was analysed through using the conventional emulsion polymerisation. Afterwards, by taking the fluorine monomer as the shell and acrylic monomers as the core, the stability and hydrophobicity of the emulsion with different core–shell ratios were studied with the seed emulsion polymerisation method employed. Based on the results derived from adding different types and dosage, TiO2 to the core–shell emulsion, it can be easily found that a better cooling effect can be obtained with the optimum amount being 10% when the particle size of TiO2 concentrates on 200–1000 nm. Finally, the reflectance spectrum of the coating and the cooling values of the asphalt specimen with the coating were tested, respectively. The results show that the albedo of the coating reaches 78.64% and the specimen temperature can be reduced by 13°C when the normal asphalt mixture approaches 60°C.