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 is used outdoors, which not only increases maintenance costs but also reduces its service life. Multifunctional coatings with UV-resistant, water-repellent, and flame-retardant properties were successfully obtained on the su...

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Bibliographic Details
Published in:Applied sciences 2021-01, Vol.11 (2), p.836
Main Authors: Wan, Yi, Hou, Sijie, Guo, Mengyao, Fu, Yanchun
Format: Article
Language:English
Subjects:
Air exposure
Aluminum
Aluminum hydroxide
Chitosan
coating
Coatings
Contact angle
Discoloration
Fire resistance
Flame retardants
flame-retardant
Hydrochloric acid
Hydrophobicity
Irradiation
layer-by-layer self-assembly
Maintenance costs
Outdoors
Scanning electron microscopy
Self-assembly
Service life
Sodium
Surface properties
Takeoff
Ultraviolet radiation
UV-resistant
water-repellent
Wettability
wood surface
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Summary:Wooden take-off board is easy to crack, deform, discolor, and decay when it is used outdoors, which not only increases maintenance costs but also reduces its service life. Multifunctional coatings with UV-resistant, water-repellent, and flame-retardant properties were successfully obtained on the surface of a wooden take-off board substrate by spray-assisted layer-by-layer self-assembly. The coatings consisted of positively-charged chitosan, Al (OH)3, and negatively-charged sodium phytate through electrostatic adsorption several times. The treated wood exhibited high UV resistance, and the color remained constant after 720 hours of ultraviolet irradiation. The wettability of the wood surface after treatment became superhydrophobic, with initial static contact angles as high as 140°. In addition, limiting oxygen index and air exposure combustion tests were used to verify that chitosan, sodium phytate, and aluminum hydroxide could synergistically confer significant fire resistance to modified wood.
ISSN:2076-3417
2076-3417
DOI:10.3390/app11020836