Water-based invisible green flexographic ink for anti-counterfeit applications

Developing chemical molecules with exceptional features as colorants in security inks for information storage has garnered significant research interest. In the quest of smart fluorescent pigments, a pyrene-based pigment- bis(pyren-1-ylmethylene)ethane-1,2-diamine (PDA), which exhibited mechanochrom...

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Bibliographic Details
Published in:Progress in organic coatings 2022-12, Vol.173, p.107212, Article 107212
Main Authors: Bhagya, R.S., Sunil, Dhanya, Muthamma, Kashmitha, Shetty, Prakasha, Kulkarni, Suresh D.
Format: Article
Language:English
Subjects:
Colorimetry
Counterfeit
Diamines
Ethane
Fluorescence
Gloss
Information storage
Inks
Light fastness
Mechanochromism
Mechanoluminescence
Pigments
Pyrene
Security printing
Spectral methods
Substrates
Ultraviolet radiation
Water-based fluorescent flexographic ink
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Summary:Developing chemical molecules with exceptional features as colorants in security inks for information storage has garnered significant research interest. In the quest of smart fluorescent pigments, a pyrene-based pigment- bis(pyren-1-ylmethylene)ethane-1,2-diamine (PDA), which exhibited mechanochromism feature was synthesized and characterized using spectral techniques. The feebly fluorescent pigment exhibited intense green fluorescence upon grinding, and reverted back to less-emissive state when heated and fumed. With PDA as pigment, the water-based flexographic ink formulation was coated on security paper and printed on boards, security and packaging papers. The printed substrates were invisible under day light and displayed green fluorescence upon excitation under UV light. The ink's gloss, lightfastness, colorimetric values and abrasion resistance suggested that PDA might be used as an invisible fluorescent ink with mechanochromic properties for security printing. An ink-less rewritable paper on which written letters and patterns using pressure can be easily erased upon suitable stimuli was developed showing real-life application in information security. [Display omitted] •Synthesis and characterization of pyrene based mechanochromic pigment, PDA•Flexographic water-based printing ink formulation•Prints with superior abrasion resistance, light-fastness, gloss, and colorimetric values•Potential candidature of PDA for security printing, labelling and anti-counterfeiting applications
ISSN:0300-9440
1873-331X
DOI:10.1016/j.porgcoat.2022.107212