室外用塗料耐光性與耐候性之研究

為了使業者了解何種塗料適合作為室外用塗料，本研究乃將目前商業化之塗料進行試驗比較，測試的塗料計有透明塗料四種，不透明塗料一種及半透明著色塗料九種，塗料塗佈於橡木與橡膠木後分為兩組，一組置於人工加速耐光試驗機進行照光試驗，另一組置於室外的。向南之耐候試驗架上，進行室外耐候性試驗。耐光和耐候試驗後之試材分別就顏色變化、光澤度變化、塗膜附著性及其他外觀性質...等予以分析，比較塗料之耐光性與耐候性。試驗結果得知，橡木與橡膠木素材很容易受光線或天候因子的影響而黃化，進而破壞，喪失其吸引人的特色。所測試的透明塗料很容易受光線或天候因子的影響而黃化或剝落，喪失保護木材之功效；而白色塗料之耐光性與耐候性最佳，受光線或天候因子影響而產生的變色均為所有測試塗料中最輕微的，能有效抑止木材之光劣化與天候劣化。至於半透明著色塗料的耐光性，以加拿大進口之咖啡色與德國進口之天然色兩種著色塗料較佳，塗膜變色均很輕微；又半透明著色塗料的耐候性，除了紅色、天然色與無色之著色塗料外，其他的均能抑止木材之天候劣化，且仍能顯現木材吸引人的紋理。

關鍵字

木材；透明塗料；著色塗料；耐光性；耐候性；顏色變化；黃化；剝落

並列摘要

In order to provide the informations for choicing the right finishes to protect wood against weathering, the lightfastness and the weatherability of fourteen commercially available finishes including four clear finishes , one white paint and nine wood stains were studied. After coating on oak and rubberwood surfaces, one set of specimens was exposed to artificially accelerated lightfastness tester and the other one was directly exposed to outdoor weathering rack. The lightfastness and the weatherability of finishes were evaluated based on the color changes, the variation of gloss and the flaking resistance of film. The experimental results indicate that unprotected wood and wood coated with clear finished are susceptible to discolor and deteriorate by ultraviolet light and atmospheric factors. Among the finishes studied, the white paint was proved to possess the best lightfastness and weatherability to protect wood against ultraviolet light and atmospheric factors. Comparisons of the performance of wood stains reveal that wood stain imported from Canada provides very good protection to wood against photo-induced degradation and weathering degradation. In addition, the lightfastness and the weatherability of wood stains examined were also compared and discussed in this paper in detail.

並列關鍵字

Wood ； clear finishes ； stains ； lightfastness ； weatherability ； color change ； yellowing ； flaking

國際替代計量

室外用塗料耐光性與耐候性之研究

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