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利用紫外(UV)光固化机对蒎烷基丙烯酸酯改性水性聚氨酯进行UV光固化反应研究,通过傅立叶红外光谱(FT-IR)、差示扫描量热仪(DSC)和凝胶色谱(GPC)对UV光固化后胶膜的性能进行了研究。考察了曝光时间、单体含量、光引发剂含量和光引发剂种类对固化后胶膜结构和热性能的影响,研究结果显示当甲基丙烯酸异冰片酯(IBOMA)含量为10%(wt,质量分数,下同),使用IR2959光引发剂用量为3%,曝光时间5min所得到的胶膜热性能较好,玻璃化转变温度(T_g)为21.06℃,数均分子量(Mn)值为20876;当丙烯酸异冰片酯(IBOA)含量为50%,使用IR2959光引发剂用量为3%,曝光时间4min所得到的胶膜热性能较好,T_g为19.94℃,Mn值为35924。
The UV light curing reaction of pinaneacrylic acid ester modified aqueous polyurethane was studied by ultraviolet (UV) light curing machine. The structure of the polyurethane was characterized by Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC) and gel permeation chromatography The properties of the film after UV curing were investigated. The effects of exposure time, monomer content, photoinitiator content and photoinitiator type on the structure and thermal properties of cured films were investigated. The results showed that when IBOMA content was 10% (wt, mass Fraction, the same below). The IR2959 photoinitiator dosage was 3% and the exposure time was 5min. The obtained film had better thermal properties, the glass transition temperature (T_g) was 21.06 ℃ and the number average molecular weight (Mn) was 20876. When the content of isobornyl acrylate (IBOA) is 50%, the amount of IR2959 photoinitiator is 3% and the exposure time is 4min, the thermal properties of the film are better. The T_g is 19.94 ℃ and the Mn value is 35924.