STUDY ON CAUSES OF DEGRADATION OF POLYESTER PROTECTIVE FILM ATTACHED ON GLASS CURTAIN WALLS

STUDY ON CAUSES OF DEGRADATION OF POLYESTER PROTECTIVE FILM ATTACHED ON GLASS CURTAIN WALLS

The defects of polyester films used for glass curtain walls, such as discoloration, peeling, and wrinkling, are thought to be caused by degradation. This occurs in a short period (approximately 1/10) of the conventional service lifetime. A comprehensive investigation demonstrated that extremely low...

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Veröffentlicht in:AIJ Journal of Technology and Design 2023/02/20, Vol.29(71), pp.46-51
Hauptverfasser: TAKAHASHI, Koichiro, OHTAKE, Yoshito, KAWAHARA, Seiichi
Format: Artikel
Sprache:jpn
Schlagworte:
Absorbers
Addition
Adhesive
Adhesive bonding
Bonding strength
Curtain walls
Defects
Degradation
Discoloration
Polyester
Service life
Ultraviolet absorber
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Zusammenfassung:The defects of polyester films used for glass curtain walls, such as discoloration, peeling, and wrinkling, are thought to be caused by degradation. This occurs in a short period (approximately 1/10) of the conventional service lifetime. A comprehensive investigation demonstrated that extremely low ultraviolet (UV) absorber (2,2’,4,4’-tetrahydroxybenzophenone) content in the adhesive coating caused the defects, instead of degradation. To increase bond strength, adhesives are blended using ester compounds with a polar group and small molecular weight, and hence, are easily degraded. Therefore, excess UV absorber addition is essential for extending the lifetime of the film and its function.
ISSN:1341-9463
1881-8188
DOI:10.3130/aijt.29.46