PE-NC semi-IPNs木器塗料（I）塗料之可使用時間及乾燥性

PE-NC semi-IPNs Wooden Coatings(I) Pot-life and Drying Character of Coatings

本研究係將不飽和聚酯樹脂（PE）與硝化纖維素（NC）摻合而成PE-NC 半互穿聚合體網狀結構物（PE-NC semi-IPNs），並分析其作為木器塗料之可行性。其中PE 係由順丁烯二酸酐：鄰苯二甲酸酐：二乙二醇依莫耳比1：1：2.05 之條件反應而成，並添加30 % 之苯乙烯及不同比例催化劑（甲乙酮過氧化物）／ 促進劑（環烷酸鈷）／ 氧化防止劑（十二烷硫醇），調配成各種PE 塗料，另將PE 與NC 以不同重量比摻合製成PE-NC semi-IPNs，各調配塗料分別探討其可使用時間及乾燥性。試驗結果得知，各種配方之PE塗料，可使用時間以催化劑／ 促進劑／ 氧化防止劑=1.5 / 0.05 / 0.1（對樹脂重量之百分比）者最長，然僅達17 min，而PE-NC semi-IPNs 塗料則可大幅延長塗料之可使用時間。又各種配方之PE 塗料在常溫及空氣中均無法乾燥，而PE-NC semi-IPNs塗料在NC 含量在40 % 以上時，其塗膜可在常溫及空氣下乾燥，PE / NC=50 / 50 者塗膜乾燥時間可縮短至2.15 hr。 Unsaturated polyester resin (PE) was synthesized with maleic anhydride: phthalic anhydride: diethylene glycol=1:1:2.05 (molar ratio）,and 30 % styrene (by wt.) would be added and mixed with catalyst (MEKPO) /accelerator (Co-Naph.) /oxidation inhibitor (dodecyl mercaptan) at various wt.% ratio to form PE coatings. Meanwhile, PE-NC semi-IPNs (Semi-interpenetrating polymer networks) were prepared by blending PE and NC (nitrocellulose) at various wt. % ratio for wooden coatings. The pot-life and drying character of PE and PE-NC semi-IPNs coatings were examined. The results revealed that PE coating at catalyst/ accelerator/ oxidation inhibitor=1.5/0.05/0.1 condition had the longest pot-life, but only 17 min. However, blending PE with NC, i.e. PE-NC semi-IPNs coatings, could prolong the pot-life of PE coatings significantly. All of PE coatings were unable to dry at room temperature and ambient atmosphere, but the films of PE-NC semi-IPNs coatings which NC content was above 40 % could be dried at the same environment, especially that of PE/NC=50/50 had the shortest drying time of 2.15 hr only.

Unsaturated polyester resin (PE) was synthesized with maleic anhydride: phthalic anhydride: diethylene glycol=1:1:2.05 (molar ratio）,and 30 % styrene (by wt.) would be added and mixed with catalyst (MEKPO) /accelerator (Co-Naph.) /oxidation inhibitor (dodecyl mercaptan) at various wt.% ratio to form PE coatings. Meanwhile, PE-NC semi-IPNs (Semi-interpenetrating polymer networks) were prepared by blending PE and NC (nitrocellulose) at various wt. % ratio for wooden coatings. The pot-life and drying character of PE and PE-NC semi-IPNs coatings were examined. The results revealed that PE coating at catalyst/ accelerator/ oxidation inhibitor=1.5/0.05/0.1 condition had the longest pot-life, but only 17 min. However, blending PE with NC, i.e. PE-NC semi-IPNs coatings, could prolong the pot-life of PE coatings significantly. All of PE coatings were unable to dry at room temperature and ambient atmosphere, but the films of PE-NC semi-IPNs coatings which NC content was above 40 % could be dried at the same environment, especially that of PE/NC=50/50 had the shortest drying time of 2.15 hr only.