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鉻鹽保護劑處理條件對於竹材顏色之影響

Effects of Chromate Preservatives Treatments on the Color of Bamboo

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摘要


竹子具有亮麗綠色的外皮,十分吸引人。然而,伐採後的竹材,其外皮顏色逐漸轉變為淡黃色或其他顔色,而失去了昔日風釆,加上竹材極易受到蟲害或黴菌危害,使得竹材的使用期限不長。因此,本試驗之目的希望藉助保護藥劑之處理,使竹材外皮保有吸引人的亮麗綠色,且使竹材具有良好的耐久性,如此將可拓展竹材的使用領域。 本試驗選用的試材有麻竹、孟宗竹、桂竹,而所使用之鉻鹽保護劑則有酸性鉻酸銅、當耐力C、保力定K-33等三種。竹材經由鉻鹽保護劑處理後,以色差計分析比較其表皮顏色之變化。試驗結果顯示:竹皮經過前處理後維持的綠色效果較未前處理者佳;鉻鹽保護劑處理後,竹皮綠色效果以麻竹、孟宗竹較佳,桂竹則效果較差;鉻鹽保護劑維持竹皮的綠色效果以保力定K-33最優,當耐力C其次,酸性鉻酸銅最差;鉻鹽保護劑處理後之綠色外皮竹材,以聚氨基甲酸酯塗料塗裝並經耐候試驗顯示,具有優異之綠色堅牢度。

並列摘要


Standing bamboo culms have attractive green colored akin. Once harvested, however, they turn to yellow or ether color sod beset by insect pests or decoys which reduce their uses and permanence. The purpose of this study is to treat bamboo wish chromate preservatives is order to retain the attractive green color and at the same time impart good durability. Ma bamboo (Dendrocalamus latiflorua), moon bamboo (Phyllostachys pubescens) and makino bamboo (Phyllostachys makinoi) were used so raw materials and treated with three kinds of chromate preservatives, i.e., acid copper chromate (ACC), Tanalith C and Boliden K-33. The color changes of chromate treated bamboo skin were evaluated with color and color difference meter. The results revealed that pretreated culms showed better green color conservation. Ma bamboo and moan bamboo gave better green color conservancy than makino bamboo. The brat green color conservation were obtained with Boliden K-33 preservative. The chromate treated bamboo coated with polyurethane showed good green color fastness in outdoor exposure teats.

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