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Despite increased use of competitive materials, such as metals and plastics, wood remains a highly popular material. To ensure their long life, wood substrates are usually coated with decorative and protective finishes, such as paints, transparent stains and penetrating finishes or film-forming clear varnishes. However, the long-term instability of such transparent systems in outdoor applications is a problem. The main reason for this is the UV light transparency of the top coats and the extreme sensitivity of certain wood components, particularly lignin, to UV light degradation. Naturally pale wood tends to yellow and darken with time as a result of lignin photo-oxidation. Durable protection against yellowing and photodegradation of wood is only achieved if HALS - a new created type of photostabiliser - is used with a UV absorber (UVA). As result of a long-time experimental program was found that blends of UVAs and HALS provide the coating and substrate better protection than the UVA on its own.
Despite increased use of competitive materials, such as metals and plastics, wood remains a highly popular material. To ensure their long life, wood substrates are usually coated with decorative and protective finishes, such as paints, transparent stains and penetrating finishes or film-forming clear varnishes. However, the long-term instability of such transparent systems in outdoor applications is a problem. The main reason for this is the UV light transparency of the top coats and the extreme sensitivity of certain wood components, particularly lignin, to UV light degradation. Naturally pale wood tends to yellow and darken with time as a result of lignin photo-oxidation. Durable protection against yellowing and photodegradation of wood is only achieved if HALS - a new created type of photostabiliser - is used with a UV absorber (UVA). As result of a long-time experimental program was found that blends of UVAs and HALS provide the coating and substrate better protection than the UVA on its own.
Wood photoprotection
Lichtschutzbehandlung von Holz
Rogez, D. (author)
PPCJ Polymers Paint Colour Journal ; 191 ; 33-35
2001
3 Seiten, 4 Bilder, 4 Quellen
Article (Journal)
English
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