A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Influence of coating additives on water vapour absorption and desorption in Norway spruce
Holz wurde mit Beschichtungsadditiven behandelt, die üblicherweise in Wasserlacken verwendet werden. Feuchteabsorption und Feuchtedesorption des behandelten Holzes wurden mit unbehandeltem Holz verglichen. Die Additive änderten die Feuchtesorptionseigenschaften des Holzes. Die Gegenwart des oberflächeaktiven Stoffes Nonylphenolethoxyphenoxylat und des Fließhilfsmittels Hydroxyethylcellulose verminderten die Geschwindigkeit der Feuchteabsorption und verzögerten stark die Feuchteabgabe während der Desorption. Aufgrund der Tatsache, dass diese Substanzen während und nach der Filmbildung mobilisiert werden und sich an der Grenzfläche von Beschichtung und Substrat anreichern, besteht eine hohe Wahrscheinlichkeit, dass diese Substanzen die Feuchtesorption ungünstig beeinflussen und unerwartete Feuchtebedingungen an der Grenzfläche hervorrufen.
The growing concern for the environment and occupational health aspects have led to the development and use of waterborne coatings for architectural applications. These coatings can be considered as a two-phase system with the binder emulsified or dispersed in the water phase. During film formation, phase separation occurs and coating additives can be mobilised and transported into wood, thus changing wood moisture sorption characteristics. In the present study, wood samples were treated with various coating additives, normally used in waterborne coatings, and exposed to various humid conditions. The moisture adsorption and desorption in the treated wood samples was compared to untreated wood samples. It is shown that the presence of substances common in waterborne coatings changes the moisture sorption characteristics of wood. The presence of a surfactant, nonylphenol ethoxyphenoxylate adduct, and the presence of a rheology modifier, hydroxyethyl cellulose, lower the rate of moisture absorption and, to a great extent, delay the release of moisture during desorption. Due to the fact that these substances occur in waterborne coatings, may be mobilised during and after film formation and accumulate at the coating/substrate interface, there is a great probability that these substances change the moisture sorption characteristics of the wood substrate in an unfavourable way and create unexpected moisture conditions at the coating/wood interface.
Influence of coating additives on water vapour absorption and desorption in Norway spruce
Holz wurde mit Beschichtungsadditiven behandelt, die üblicherweise in Wasserlacken verwendet werden. Feuchteabsorption und Feuchtedesorption des behandelten Holzes wurden mit unbehandeltem Holz verglichen. Die Additive änderten die Feuchtesorptionseigenschaften des Holzes. Die Gegenwart des oberflächeaktiven Stoffes Nonylphenolethoxyphenoxylat und des Fließhilfsmittels Hydroxyethylcellulose verminderten die Geschwindigkeit der Feuchteabsorption und verzögerten stark die Feuchteabgabe während der Desorption. Aufgrund der Tatsache, dass diese Substanzen während und nach der Filmbildung mobilisiert werden und sich an der Grenzfläche von Beschichtung und Substrat anreichern, besteht eine hohe Wahrscheinlichkeit, dass diese Substanzen die Feuchtesorption ungünstig beeinflussen und unerwartete Feuchtebedingungen an der Grenzfläche hervorrufen.
The growing concern for the environment and occupational health aspects have led to the development and use of waterborne coatings for architectural applications. These coatings can be considered as a two-phase system with the binder emulsified or dispersed in the water phase. During film formation, phase separation occurs and coating additives can be mobilised and transported into wood, thus changing wood moisture sorption characteristics. In the present study, wood samples were treated with various coating additives, normally used in waterborne coatings, and exposed to various humid conditions. The moisture adsorption and desorption in the treated wood samples was compared to untreated wood samples. It is shown that the presence of substances common in waterborne coatings changes the moisture sorption characteristics of wood. The presence of a surfactant, nonylphenol ethoxyphenoxylate adduct, and the presence of a rheology modifier, hydroxyethyl cellulose, lower the rate of moisture absorption and, to a great extent, delay the release of moisture during desorption. Due to the fact that these substances occur in waterborne coatings, may be mobilised during and after film formation and accumulate at the coating/substrate interface, there is a great probability that these substances change the moisture sorption characteristics of the wood substrate in an unfavourable way and create unexpected moisture conditions at the coating/wood interface.
Influence of coating additives on water vapour absorption and desorption in Norway spruce
Einfluss von Beschichtungsadditiven auf die Absorption und Desorption von Wasserdampf von Picea abies
Ekstedt, J. (author)
Holzforschung ; 56 ; 663-668
2002
6 Seiten, 6 Bilder, 3 Tabellen, 12 Quellen
Article (Journal)
English
Additiv , Absorption , Desorption , Wasserdampf , Wasserlack , Holz , Oberfläche , Geschwindigkeit , Grenzfläche , Substrat , Feuchte , organische Verbindung
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