| Abstract:In this study, MMA was used as the hard monomer and BA as the soft monomer to prepare a fluorine-free and silicone-free "core-shell" acrylic emulsion with an "inner-hard, outer-soft" structure using the pre-emulsion seed emulsion polymerization method. The water resistance of the emulsion was improved by using St, and the latex film"s compactness was enhanced through NMA/MAA crosslinking, thereby further improving the emulsion"s water and oil resistance. FTIR spectra confirmed that MMA, BA, St, NMA, and MAA all participated in the copolymerization, with NMA and MAA undergoing crosslinking and successfully grafting onto the main chain structure of the emulsion. TEM images showed that the latex particles exhibited a core-shell structure, with a uniform particle size distribution of approximately 111 nm, consistent with the results from the laser particle size analyzer. The crosslinked modified core-shell phenylpropyl emulsion coating was applied to barrier paper, which exhibited excellent water resistance with a Cobb1800s water absorption value of 8.6 g/m2, approximately 48.5% lower than that of the unmodified paper. Additionally, the paper displayed outstanding oil resistance, with a kit rating of 10/12, which is one level higher than that of the unmodified paper. Furthermore, the coated samples demonstrated excellent mechanical properties, thermal stability, and heat seal ability. |