Study on Storage Stability of Waterborne Gravure Ink and Adhesion on PET/BOPP Film Surface

摘要

Water-based gravure printing ink is a very promising environmental-friendly ink for the application in the plastic substrates. This contribution aims to improve the storage stability, adhesion on non-polar plastic substrates, such as BOPP etc., of the water-based gravure printing ink. A core-shell polyacrylate resin emulsion was synthesized, and used as a binder to prepare water-based plastic gravure ink. The effects of location of the crosslinking groups on the storage stability and adhesion of the ink were studied, and the formulation of the ink was optimized. It was found that, when the cross-linking groups were located on the inner layer of the latex particles, the storage stability of the relative ink, especially of the yellow ink, was improved greatly whereas the adhesion and other properties of the ink were not changed significantly. The adhesion of ink on PET film, especially on the surface of BOPP film, can be increased effectively with addition of adhesion accelerator. With the reduction of emulsion Tg. VOC content of ink is decreased, and film-forming rate and film-forming quality are improved, which improves adhesion of the ink. However, the adhesion of ink is decreased with the increase of wet film thickness.