Preparation of a Cross-linkable Emulsion and its Effectiveness as the Binder Resin of Water-based Printing inks Curable at Ambient Temperature

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Abstract:

The proposed resin system mainly comprises two components: a nano-sized emulsion and a crosslinking agent, adipic dihydrazide. The nano-emulsion was prepared through soapless emulsion polymerization of acrylic monomers in the presence of a reactive amphiphillic block copolymer, which was synthesized through living polymerization of diacetone acrylamide and acrylic acid. The nano-emulsion was narrowly distributed in size and the average diameter is around 50 nm. The nano-emulsion was very stable even at 45 wt.%. DSC analysis showed that the polymer of the emulsion had a low glass transition temperature (Tg) (about 15 °C), but the emulsion still remained stable at a wide temperature range (4-50 °C) despite the addition of the cross-linker. Emulsion films were coated with the mixture of the nano-emulsion, the cross-linker and a small amount of leveling agent by spin-coating method, and this was followed by drying at ambient temperature. SEM analysis indicated that the border of particles had disappeared and a uniform film was obtained. Investigation on dissolution behaviors of the emulsion films showed that cross-linking reaction occurred with the evaporation of water. With the drying of the film at ambient temperature, a tough and transparent cross-linked film was prepared, which had good water/solvent resistance. This self-crosslinking resin system might be used as the binder resin for water-based printing inks which can be effectively cured at ambient temperature.

Document Type: Research Article

Publication date: January 1, 2012

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  • For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.

    Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.
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