多羥基樹脂種類對PU-NC Semi-IPNs木器塗料性質之影響

Effects of Polyols on the Properties of PU-NC Semi-IPNs Wood Coatings

劉正宇(Cheng-Tzu Liu) ； 盧崑宗(Kun-Tsung Lu) ； 江燕秋(Yahn-Chiou Jiang)

《林產工業》 20卷3期 (2001/09) Pp. 237-245

https://doi.org/10.6561/FPI.2000.20(3).7

摘要

本研究係以己二酸（AA）及鄰苯二甲酸酐（PA）等多元酸與乙二醇（EG）、丙二醇（PG）及二乙二醇（DEG）等多元醇，以OH/COOH=1.5（莫耳比），配合而合成共6種多羥基樹脂，再分別與芳香族聚異氰酸酯（PTDI）及硝化纖維素（NC），在NCO/OH=1.2（莫耳比）及PU/NC=70/30（重量比）之條件下，調製成PU-NC半互穿緊合體網狀結構物（Semi-IPNs），作為木器塗料使用，探討6種不同多羥基樹脂對PU-NC semi-IPNs塗料與塗膜性質之影響。試驗結果發現，一般以含鄰苯二甲酸酐較己二酸者有較低的粘度，較短的乾燥時間及較長的可使用時間，然而所有塗料均在45 min以內即可達乾燥狀態。整體而言，PU-NC semi-IPNs塗膜以含己二酸者有較高的拉伸強度及耐衝擊性，而以含鄰苯二甲酸酐者則有較高的硬度。又所有塗膜之附著性尚佳，耐久性均極優良且光澤保留率均可達93%以上之水準。經FT-IR分析，各種塗膜之PU與NC主要是以物理性的互穿纏繞為主。綜合各項試驗結果，在6種配方中，以AA-DEG多經基樹脂之PU-NC semi-IPNs可獲得較佳且均衡的塗料與塗膜性質。

關鍵字

半互穿聚合體網狀結構物 ； 多羥基樹脂 ； 聚胺酯樹脂 ； 硝化纖維素 ； 木器塗料

並列摘要

The PU-NC semi-interpenetrating polymer networks (semi-IPNs) made from polyol, aromatic polyisocyanate (PTDI), and nitrocellulose (NC) under the NCO/OH=1.2 (molar ratio) and PU/NC=70/30 (by weight), were prepared by sequential polymerization for wood coatings. In order to investigate the effects of polyol on the properties of PU-NC semi-IPNs wood coatings, six kinds of polyol Professor, Assistant Professor ( Corresponding Author ) , Graduate Student, Department of Forestry, National Chung-Hsing University, Taichung, Taiwan, R.O.C. based on polybasic acid i.e, adipic acid (AA), phthalic anhydride (PA) and polyhydric alcohol i.e. ethylene glycol (EG), propylene glycol (PG), diethylene glycol (DEG) with OH/COOH=1.5 (molar ratio), were examined in this study. The results showed that the PU-NC semi-IPNs which containing PA had lower viscosity, snorter drying time and longer pot-life of coating than those of with AA. However, all of the coatings could be dried within 45 min. Generally speaking, PU-NC semi-IPNs with AA had higher tensile strength and impact resistance, while, those which containing PA had higher hardness of films. In addition, all films had excellent adhesion, durability and gloss retention could reach 93% level. FT-IR analysis also indicated that six kinds of PU-NC semi-IPNs had good interpenetrating between PU and NC. On these test results, it could be concluded that PU-NC semi-IPNs with AA-DEG polyol had an excellent performance and balance on the properties of coatings and films.

並列關鍵字

Semi-interpenetrating polymer networks ； Polyol ； Polyurethane ； Nitrocellulose ； Wood coatings