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| Preparation of Cross-linked Modified Styrene-acrylic Emulsion and Its Application in Food Packaging Paper |
| Received:February 26, 2025 Revised:March 09, 2025 |
| DOI：10.11980/j.issn.0254-508X.2025.08.012 |
| Key Words:food wrapping paper waterproof and oilproof cross-linked modified styrene-acrylic emulsion |
| Author Name | Affiliation | Postcode | | LIU Xiaoqing* | College of Light Industry Science and Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | WANG Xiwen* | College of Light Industry Science and Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | YANG Jin* | College of Light Industry Science and Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 |
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| Abstract:In this study， methyl methacrylate (MMA) was used as the hard monomer and butyl acrylate (BA) as the soft monomer. The pre-emulsified seed emulsion polymerization method was adopted. The crosslinking agent N-hydroxymethylacrylamide/methacrylic acid (NMA/MAA) was added to the core layer， and styrene (St) was added to the shell layer to prepare the cross-linked modified core-shell styrene-acrylic emulsion. The obtained emulsion was coated onto thin sheet paper to prepare barrier paper.FT-IR spectroscopy confirmed that MMA， BA， St， NMA/MAA all participated in copolymerization. NMA/MAA successfully grafted onto the main chain structure of the emulsion molecule. TEM indicated that the latex particles present a core-shell structure and had a uniform particle size distribution， with a particle size of approximately 111 nm.The barrier paper prepared with PMBS-NA3 emulsion (with St dosage of 20% and crosslinking agent dosage of 0.5%) had good water resistance， Cobb1 800 s water absorption value was 8.6 g /m2， which was approximately 48.5% lower than that of the barrier paper prepared with unmodified emulsion， and had excellent oil resistancd， kit grade reached 10 grade. |
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