离子液体-脲基嘧啶酮混合型低收缩率单体的制备及应用

摘要

通过加成反应,制备了3种不同分子量的UV固化型的脲基嘧啶酮单体(UPy-PEG),同时合成了UV固化型咪唑类离子液体(IMAA),将两类单体混合,制备了3种UV固化型离子液体-脲基嘧啶酮(IMAA-UPy-PEG)混合单体.将其加入UV固化型环氧丙烯酸树脂中,体系具有较小的体积收缩率.通过核磁氢谱(1HNMR)证实了IMAA和UP.PEG单体的成功合成,将两者在冰浴条件下超声,可以得到均匀的混合单体IMAA-UPy-PEG.通过实时红外(RT-FTIR)证实混合单体有较高的光聚合活性.收缩率测试的结果显示混合单体添加量由10％增加到30％时,配方的最大收缩率由5.33％减小到4.81％.与商品化单体HEMA相比,体系的体积收缩率最多可下降3.6％,具有较小的收缩率.涂膜基本性能显示随着混合单体加入量的增加,涂层的硬度及光泽度略有下降,但均在可使用范围内.%Three UV-curing ureido pyrimidine (UPy-PEG) monomers with different molecular weight were prepared by addition reaction,and UV-curable imidazole ionic liquid (IMAA) was also synthesized.Three UV-curable ionic liquid-ureido pyrimidone (IMAA-UPy-PEG) monomers were prepared by mixing two kinds of monomers.The system had low volume shrinkage with IMAA-UPy-PEG added to the UV curable epoxy acrylic resin.The synthesis of IMAA and UPy-PEG were confirmed by 1 HNMR spectroscopy.Homogeneous mixed monomers can be obtained by mixing UPy-PEG and IMAA and ultrasound in the ice bath.Real-time Fourier Transform Infrared (RT-FTIR) confirmed that the mixed monomers all had high photopolymerization rate.The maximum shrinkage of the formulations decreased from 5.33％ to about 4.81％ when the addition of the mixed monomer increasing from 10％ to 30％.Compared with the commercial monomer HEMA,the formulations with mixed monomer all have lower volume shrinkage,with the shrinkage decreased to 2.6％.The test of the properties of UV-curable coatings showed that the hardness and gloss of the coating films decreased with the addition of the mixed monomer,but are within the scope of use.