▎ 摘　　要

NOVELTY - Hydrophilic photothermal coating comprises 85-98 wt.% hydrophilic polymer aqueous solution, 0.2-5 wt.% photothermal material and 2-10 wt.% film-forming agent. In the hydrophilic polymer aqueous solution, the solid content of the hydrophilic polymer is 2-15 wt.%. The film-forming agent is polyvinyl alcohol. USE - Used as hydrophilic photothermal coating. ADVANTAGE - The method is simple and easy to implement; and does not require complicated special device. The photothermal coating has high hydrophilicity, high stability and high interface evaporation rate, and important application prospects in the fields of seawater desalination and sewage treatment to obtain clean water. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: preparing the hydrophilic photothermal coating, comprising providing hydrophilic polymer aqueous solution, adding film-forming agent to the hydrophilic polymer aqueous solution, dissolving to obtain mixed solution, and adding photothermal material to the mixed solution to obtain hydrophilic photothermal coating; hydrophilic photothermal material, comprising carrier and hydrophilic photothermal coating applied to the surface of the carrier, where the hydrophilic photothermal coating is the hydrophilic photothermal coating, and the carrier comprises filter paper or cotton fabric; and preparing the hydrophilic photothermal material, comprising soaking the carrier in the hydrophilic photothermal coating, and soaking in the crosslinking agent solution to obtain the hydrophilic photothermal material after drying.