- 期刊
有機藥劑前處理對透明塗裝木材光變色之抑制效應
Inhibition of Photodiscoloration of Wood Coated with Clear Finishes by Pretreating with Organic Reagents
摘要
透明塗裝是保護木質材料常用的方法之一，在使用環境中很容易受到光線的影響而造成塗裝材的顏色改變，失去原有之色調與紋理。本試驗嚐以光安定劑與聚乙二醇等有機藥劑前處理木材，再以含光安定劑之透明塗料予以塗裝，評估前處理對透明塗裝材耐光性之影響。試驗結果顯示，耐光性較差之淺色木材（如美國鐵杉、杉木等）僅以含光安定劑之透明塗料塗裝，照光後仍無法抑制其光黃化；如先以光安定劑（紫外光吸收劑與自由基捕捉劑）前處理六種木材，除了硬槭木以外之塗裝材的光變色均被有效地抑制。而以聚乙二醇前處理之塗裝材，對於柳杉、紅柳桉等深色材而言，耐光試驗後塗裝材的明度呈顯著的上升，可能的原因為聚乙二醇照光後所產生之過氧化物，除了與光黃化過程之先驅物質反應外，還會與木材中之有色物質反應，產生漂白的效果；對於含顏色物質較少之美國鐵杉與杉木等淺色木材，以聚乙二醇前處理之塗裝材，照光後散反射光譜的變化輕微，顯示聚乙二醇前處理可以有效抑制透明塗裝材的光黃化，提高透明塗裝材之耐光性。
並列摘要
Clear coating is one of the appropriate methods to protect woody materials. Clear coated wood was susceptible to discoloration after light irradiation. To study the effect of pretreatment on the lightfastness of clear coated wood, wood specimens were pretreated with light stabilizers and polyethylene glycol (PEG), respectively, and followed by coating with clear coatings containing Tinuvin-1130 and Tinuvin-123 light stabilizers. The experimental results indicated it couldn't effectively inhibit the photoyellowing of the light -colored wood such as Western hemlock and China fir by coating with clear coatings containing the light stabilizers. Pretreating six wood species with UV absorber and hindered amine light stabilizer could effectually inhibit the discoloration induced by light with the exception of hard maple. The brightness of the dark-colored wood such as Japanese fir and red lauan pretreated with PEG and then coated with clear coating containing light stabilizer would increase after the lightfastness test. It was plausible that, after absorbing the UV light, hydroperoxides induced on the PEG-treated wood surfaces reacted with both the precursors of photoyellowing products and color materials of wood, thereby resulting in photobleaching. The variations in the diffuse reflectance spectra of the coated light-colored wood pretreated with PEG were slightly detected after the lightfastness test. It revealed that pretreatment with PEG could more effectively inhibit the photoyellowing of coated wood.
延伸閱讀
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