Surface Properties of Spray-Assisted Layer-By-Layer ElectroStatic Self-Assembly Treated Wooden Take-Off Board

Wooden take-off board is easy to crack, deform, discolor, and decay when it used outdoors, which not only increases maintenance costs but also reduces its service life. Multifunctional coatings with UV-resistant, water-repellent, flame-retardant properties were successfully obtained on the surface of a wooden substrate by spray-assisted layer-by-layer self-assembly. The consisted positively-charged chitosan, Al (OH)3, negatively-charged sodium phytate through electrostatic adsorption several times. treated wood exhibited high UV resistance, color remained constant after 720 hours ultraviolet irradiation. wettability treatment became superhydrophobic, initial static contact angles as 140°. In addition, limiting oxygen index air exposure combustion tests verify that phytate, aluminum hydroxide could synergistically confer significant fire resistance modified wood.