Insights into the influence mechanism of alkali-soluble resins (ASRs) with different acidity and the synergistic improvement of dryness and adhesion of water-based ink
摘要
Drying rate and adhesion fastness are two crucial indices to evaluate the application performance of ink. The focus of this study is the synthesis of polyacrylate emulsions for water-based ink binders using two different types of alkali-soluble resins (ASRs), Joncryl 678 (J678) and Soluryl-60L (S60L), which have different acid values, as surfactants to achieve a synergistic increase in drying rate and adhesion fastness. The basic properties and application performances of latexes were comprehensively investigated. Atomic force microscopy (AFM) analyses confirmed the existence of core-shell structures. Variations in emulsifier type resulted in differences in the dimensions of the polyacrylate latex particles, suggesting that the mechanism of ASR differs significantly from the micelle theory typically associated with conventional emulsifiers. Furthermore, the integration of ASR was observed to improve both the ethanol and water resistance of the latex materials. The investigation into the dynamic drying of ink revealed that ASR latex significantly enhances the drying process of water-based inks. Most notably, the adhesion properties of the corresponding inks on polyethylene (PE), biaxially oriented polypropylene (BOPP), and polyethylene terephthalate (PET) films were directly measured, revealing that the use of ASR as an emulsifier contributes positively to these adhesion characteristics. The findings indicate that the ASR acrylate emulsion, used as a binding agent, demonstrates significant potential for development in the field of water-based inks.