Preparation of Polyurethane/Polyacrylate Composite Emulsion and Its Application on Printing

PU Juan; HUANG Yongbin; CHEN Ren; LU Jiehong; ZHAO Wenai; YUAN Teng

doi:10.19554/j.cnki.1001-3563.2025.11.004

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Packaging Engineering ›› 2025, Vol. 46 ›› Issue (11) : 28-35. DOI: 10.19554/j.cnki.1001-3563.2025.11.004

Advanced Materials

Preparation of Polyurethane/Polyacrylate Composite Emulsion and Its Application on Printing

PU Juan, HUANG Yongbin, CHEN Ren, LU Jiehong, ZHAO Wenai, YUAN Teng

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Abstract

The work aims to explore the best mixing ratio of polyacrylate emulsion and polyurethane emulsion, in order to apply them in the application of printing paste to achieve complementary advantages. Polyester diol, polyether diol, isophorone diisocyanate, dihydroxymethylpropionic acid, hexanedihydrazide and other raw materials were synthesized to hydrazide-based end-capped urethane emulsions. With n-butyl acrylate as the soft monomer, styrene as the hard monomer, and acrylic acid, hydroxyethyl acrylate and bis(acetone)acrylamide as functional monomers, the acryl ketocarbonyl copolymer emulsions were prepared through emulsion polymerization, and the both were mixed in different proportions to obtain the polyacrylate polyurethane composite emulsions (PUA). Then, the silicone-containing modified acrylic emulsions were used to investigate the modification effect of the composite emulsions. The test results indicated that with the rise of n(NH—NH₂)/n(C=O), the tensile strength of the cured film increased from 1.34 MPa to 2.17 MPa, the residual carbon rate increased from 4.77% to 12.62%, and the water contact angle increased from 66.63° to 80.36°. The addition of silicone monomers to acrylic emulsions modified the water contact angle of PUA cured films from 80.36° to 90.21°. With the increase of n(NH—NH₂)/n(C=O) in PUA, the tensile strength of the cured film increases, the thermal stability increases, the water contact angle increases and the water absorption decreases, and the overall performance of the prints becomes better. The addition of organosilicone monomers in acrylic emulsions further improves the water resistance of the prints.

Key words

polyurethane emulsion / polyacrylate emulsion / ketohydrazide crosslinking / silicone-oxygen bonding / printing pastes

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PU Juan, HUANG Yongbin, CHEN Ren, LU Jiehong, ZHAO Wenai, YUAN Teng. Preparation of Polyurethane/Polyacrylate Composite Emulsion and Its Application on Printing[J]. Packaging Engineering. 2025, 46(11): 28-35 https://doi.org/10.19554/j.cnki.1001-3563.2025.11.004

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