頁籤選單縮合
題 名 | 含有紫外光安定劑塗膜劣化之研究 |
---|---|
作 者 | 張上鎮; | 書刊名 | 林業試驗所研究報告季刊 |
卷 期 | 2:2 1987.06[民76.06] |
頁 次 | 頁165-185 |
分類號 | 474.33 |
關鍵詞 | 劣化; 安定劑; 紫外光; 塗膜; |
語 文 | 中文(Chinese) |
中文摘要 | 塗膜很容易受紫外光的影響而劣化,本試驗的主要目的是研究紫外光 安定劑添加入塗料中對於塗膜耐光性之影響,並研究塗膜受紫外光作用所產生之 劣化。本試驗使用二種紫外光安定劑,即2,4-雙羥基二甲苯酮 (HBP)與2-氰基 -3,3-二苯基丙烯酸乙酯(ECPA)分別添加於硝化纖維素拉卡塗料(NC)與聚酯塗料 (PU)中,以此作為防止臺灣杉表面色變之保護劑。以掃瞄電子顯微鏡、X光能量 散射分析儀進行檢視與分析塗膜表面之變化情形,試驗結果顯示含有紫外光安定 劑之塗料系統不但不能發揮其保護功效,抑止臺灣杉的色變,相反地,反而加速 塗膜的劣化。此乃因為紫外光安定劑與塗料樹脂的相容性不好,故含有紫外光安 定劑之塗膜靜置於常溫室內一段時間後,即產生分離作用,紫外光安定劑單獨或 是與塗料中矽類添加物結合後,慢慢地析出於塗膜表面,先集聚成塊狀、片狀或 長條狀的構造物,然後再分裂成顆粒狀的類似結晶物,如將含有紫外光安定劑之 塗膜曝露於紫外光下,則受紫外光之影響而加速了紫外光安定劑與塗料樹脂之分 離作用,使得塗料樹脂亦遭受破壞,而塗膜表面則佈滿容易剝離的顆粒狀類似結 晶物,這些顆粒狀的類似結晶物經由光譜分析確知為紫外光安定劑,換言之,含 有紫外光安定劑之塗膜受光之作用會劣化成佈滿顆粒狀紫外光安定劑之表面。 |
英文摘要 | The objective of this study was to determine the effect of ultraviolet stabilizers on the performance of clear coating films in the prevention of discoloration of Taiwania cryptomerioides lumber. It was accomplished by using scanning electron microscope (SEM), energy dispersive X-ray analysis (EDXA) technique and infrared (IR) spectroscope. Clear coating systems studied were nitrocellulose (NC) and polyurethane (PU) consisted of 2,4-dihydroxy-benzophenone (HBP) or ethy1-2- cyano-3, 3-diphenylacrylate (ECPA) which functioned as an ultraviolet absorber. SEM observations showed that crystalline particles appeared on the coating films studied as it was exposed to ambient conditions or ultraviolet light. The EDXA technique revealed silicon signals from the silicone-type additives in the crystalline particles. Further analysis with infrared spectroscope demonstrated that the crystalline particles were actually the ultraviolet stabilizers. Conclusions drawn from these findings are as follows: 1.Due to their incompatibility, ultraviolet stabilizers, whether alone or combined with silicone-type additives, separate from coating resins in the form of crystalline particles. 2.This separation is accelerated by the exposure to ultraviolet light. 3.The clear coatting systems containing the aforemintioned ultraviolet stabilizers are vulnerable to the deleterious effects of ultraviolet light and therefore are rendered inoperative in the pretection against discoloration of Taiwania cryptomerioides lumber. |
本系統中英文摘要資訊取自各篇刊載內容。