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首页> 外文期刊>ACS Omega >Novel Waterborne UV-Curable Hyperbranched Polyurethane Acrylate/Silica with Good Printability and Rheological Properties Applicable to Flexographic Ink
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Novel Waterborne UV-Curable Hyperbranched Polyurethane Acrylate/Silica with Good Printability and Rheological Properties Applicable to Flexographic Ink

机译：具有良好的适印性和流变性能的新型水性紫外线可固化的超支化聚氨酯丙烯酸酯/二氧化硅，适用于柔性版印刷油墨

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Novel waterborne UV-curable hyperbranched polyurethane acrylate/silica (HBWPUA/SiO_(2)) nanocomposites were prepared by a three-step procedure and sol–gel method. ~(1)H NMR and ~(13)C NMR results indicate that HBWPU is successfully synthesized. Surface tension and contact angle tests both demonstrate the good wettability of the nanocomposites. Besides, the kinetics of photopolymerization of HBWPUA/SiO_(2) films were analyzed by attenuated total reflection-Fourier transform infrared spectroscopy, which reveals that the modified SiO_(2) could accelerate the curing speed of HBWPUA coatings. Thermal gravity analysis indicates that the HBWPUA/SiO_(2) hybrid films have a better thermal stability than the pure HBWPUA cured films. Furthermore, the hybrid films show enhanced pencil hardness, abrasion resistance, and adhesion. On the basis of the above, HBWPUA/SiO_(2) nanocomposites were finally applied to waterborne UV-curing flexographic printing ink, which is printed on poly(ethylene terephthalate) and glass. The nanocomposite presents good rheological behavior because the ink has a lower Z _(0), a higher Z _(∞), and the viscosity rebuild time is 375 s. Three colors (red, yellow, and blue) of ink were used to test its printing quality, the curing time was below 30 s, and the adhesion was excellent without being stripped. All of the inks show good water resistance and abrasion resistance. Moreover, the red and blue inks possess better solid densities than the value of 1.07 of yellow ink, and are 1.83 and 1.84, respectively. The current study suggests that the process has promise in applications of food packages.
机译：通过三步法和溶胶-凝胶法制备了新型的水性紫外线可固化的超支化聚氨酯丙烯酸酯/二氧化硅（HBWPUA / SiO_（2））纳米复合材料。 〜（1）H NMR和〜（13）C NMR结果表明已成功合成HBWPU。表面张力和接触角测试均证明了纳米复合材料的良好润湿性。此外，通过衰减全反射-傅立叶变换红外光谱分析了H​​BWPUA / SiO_（2）薄膜的光聚合动力学，发现改性的SiO_（2）可以加快HBWPUA涂层的固化速度。热重分析表明，HBWPUA / SiO_（2）杂化膜比纯HBWPUA固化膜具有更好的热稳定性。此外，杂化膜显示出增强的铅笔硬度，耐磨性和粘附性。在此基础上，最终将HBWPUA / SiO_（2）纳米复合材料应用于水性UV固化柔性版印刷油墨，该油墨印刷在聚对苯二甲酸乙二醇酯和玻璃上。纳米复合材料表现出良好的流变行为，因为油墨具有较低的Z _（0），较高的Z _（∞），并且粘度重建时间为375 s。三种颜色（红色，黄色和蓝色）的墨水用于测试其印刷质量，固化时间低于30 s，并且附着力极佳，没有剥离。所有油墨均显示出良好的耐水性和耐磨性。而且，红色和蓝色墨水具有比黄色墨水1.07更好的固体密度，分别为1.83和1.84。当前的研究表明，该过程在食品包装的应用中有望实现。

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