双向拉伸聚丙烯(BOPP)膜广泛应用于软包装材料领域。由于BOPP膜是一种非极性亲油高分子材料,通常导致水性油墨在其表面印刷性能较差。采用电晕处理法在BOPP膜表面修饰羟基,将聚丙烯酸(PAA)接枝在BOPP电晕膜表面,通过氢键作用将SiO2@TiO2纳米涂层牢固结合在BOPP/PAA接枝膜表面,制备出具有高透光性和优异印刷性能的BOPP/SiO2@TiO2纳米复合膜。通过拉曼光谱仪、X射线衍射仪、傅里叶变换红外光谱仪、扫描电子显微镜等对纳米复合膜的结构和形貌进行表征,通过滚涂和丝网印刷工艺研究了稀释和未稀释水性油墨对BOPP/SiO2@TiO2纳米复合膜印刷效果的影响。结果表明:SiO2@TiO2纳米涂层可以均匀、牢固地附着在BOPP/PAA接枝膜上,且硅钛摩尔比为1∶1的纳米复合膜透光率超过90%;水性油墨在纳米复合膜上的印刷精度和附着性能相较于其他BOPP膜都得到显著提升。
Biaxial orientated polypropylene (BOPP) film is widely used in the field of flexible packaging materials.Because BOPP film is a non-polar lipophilic polymer material,it usually leads to poor printing performance of waterborne ink on its surface.The hydroxyl group was modified on the surface of BOPP film by corona treatment,and polyacrylic acid (PAA) was grafted on the surface of the corona-treated BOPP film.The SiO2@TiO2 nanocoatings were firmly attached to the surface of the BOPP/PAA grafted film through hydrogen bonding.In this way,the BOPP/SiO2@TiO2 nanocomposite film with high light transmittance and excellent printing performance was successfully prepared.Raman spectroscopy,X-ray diffraction,Fourier transform infrared spectrometer and scanning electron microscopy were used to characterize the structure and morphology of the nanocomposite film.Further,the effects of diluted and undiluted waterborne inks on the printing quality of the BOPP/SiO2@TiO2 nanocomposite film were studied by roller coating and screen printing processes.The results showed that the prepared SiO2@TiO2 nanocoatings could be uniformly and firmly attached to the BOPP/PAA grafted films,and the light transmittance of the nanocomposite film with the molar ratio of Si to Ti of 1∶1 exceeded 90%.Compared with other BOPP films,the printing accuracy and adhesion properties of the waterborne inks on the nanocomposite film were significantly improved.
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基金资助
国家自然科学基金(U21A2090,U23A20583);台州市科技计划项目(22gyb28);台州市高层次人才特殊支持计划(青年人才)(2023NMS01)
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