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題 名 | 聚異氰酸鹽種類對PU-NC Semi-IPNs木器塗料性質之影響=Effects of Polyisocyanates on the Properties of PU-NC Semi-IPNs Wood Coatings |
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作 者 | 盧崑宗; 劉正字; | 書刊名 | 林產工業 |
卷 期 | 18:2 1999.06[民88.06] |
頁 次 | 頁113-124 |
分類號 | 474.33 |
關鍵詞 | 半互穿聚合體網狀結構物; 聚胺基甲酸酯; 硝化纖維素; 聚異氰酸鹽; 木器塗料; Semi-interpenetrating polymer networks; Polyurethane; Nitrocellulose; Polyisocyanate; Wood coatings; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究係以吹製型篦麻油(BCO)、聚異氰酸鹽、硝化纖維素(NC)等原料,在NCO/OH = 1.2( 莫耳比 ) 及 PU/NC=70/30( 重量比 ) 之條件下, 藉由連續聚合方式, 調製成 PU-NC 半互穿聚合體網狀結構物 (Semi-IPNs),作為木器塗料使用,探討 PU 成分中,聚異 氰酸鹽種類 (PTDI、PMDI、 PIPDI、PHDI) 對塗料與塗膜性質之影響,試驗結果發現,塗料 粘度以芳香族聚異氰酸鹽者較脂肪族者為高, 其中以 PMDI 者最高, 乾燥時間仍以芳香族 PTDI 及 PMDI 者最短,膠化時間除 PMDI 者於 12 小時膠化外, PTDI 及脂肪族 PIPDI 及 PHDI 者均可達 30 日以上;塗膜性質方面,PTDI 者其 PU 與 NC 之互穿效果最佳,耐溶劑 性最優良及具最高的 Tg 值,但在 450 ℃之熱重損失最多;PMDI 者則有最高的塗膜拉伸強 度與耐熱性,但塗膜耐光性則最差; PIPDI 者塗膜硬度最高,耐光性最佳,但塗膜拉伸強度 與破壞伸長率最低,是一硬且脆的塗膜; PHDI 者塗膜硬度最低,耐溶劑性最差,Tg 值亦最低, 但其塗膜破壞伸長率最高, 是一軟而具韌性的塗膜。 此外, 所有 PU-NC semi-IPNs 塗膜, 均具有優良的附著性、耐久性及光澤保留率, 以 DMA 分析結果, 所有 semi-IPNs 之 PU 與 NC 相容性良好,及具有永久互穿纏繞的可能性。 |
英文摘要 | The semi-interpenetrating polymer networks (semi-IPNs) made from blown castor oil (BCO) based polyurethane (PU) and 1/2" nitrocellulose (NC) under the NCO/OH=1.2(molar ratio) and PU/NC=70/30 (by weight), were prepared for wood coatings. Four kinds of polyisocyanate, PTDI (Polytoluene diisocyanate), PMDI (Polydiphenylmethane diisocyanate), PIPDI (Polyisophorone diisocyanate), and PHDI (Polyhexamethylene diisocyanate), were used in PU respectively. The results revealed that PU-NC semi-IPNs containing PMDI had the highest viscosity and those containing PTDI or PMDI had the shortest drying time among all tested coatings. The gel time of all PU-NC semi-IPNs was achieved for more than 30 days but PMDI-containing could be gelled within 12 hours. For the film properties of all PU-NC semi-IPNs, PTDI-containing had the best solvent resistance, the highest Tg (glass transition temperature), and the best interpenetration between PU and NC, however, it had the highest weight loss at 450 ℃. PU-NC semi-IPNs containing- MDI had the best tensile strength and thermal stability, but the worst lightfastness among all tested films. Semi-IPNs containing PIPDI had the best lightfastness but possessed a hard and brittle film. PU- NC semi-IPNs containing PHDI had the worst solvent resistance and hardness, the lowest Tg, but the highest elongation at break of film. Meanwhile, all PU-NC semi-IPNs had the excellent adhesion, durability and gloss retention of films. In addition, using DMA testing indicated that the probability of permanent entanglement between PU and NC occurred in PU-NC semi-IPNs with different polyisocyanate. |
本系統中英文摘要資訊取自各篇刊載內容。