Photo-oxidation stability of microcapsules in thermochromic prints

Rožić, Mirela; Vukoje, Marina

doi:10.25027/agj2017.28.v28i3.138

Cited by 1 publication

(2 citation statements)

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“…UV absorbers play a very important role in improving the light fastness of colourants, while zinc and nickel 2,4-dihydroxybenzophenone-3-carboxylates were proposed as effective stabilizers against the fading of colour formers [ 7 , 8 , 9 ]. Moreover, due to the very complex system of TC inks, the photo-oxidation stability of thermochromic prints is affected by the chemical composition of the binder and the TC microcapsules, interactions between printing ink binder and microcapsules, and the ink binder drying mechanism [ 10 ]. The increase in the stability of thermochromic inks to UV radiation was the subject matter of an increasing number of studies.…”

Section: Introductionmentioning

confidence: 99%

“…Rožić et al showed that small proportions (up to 20%) of zeolite tuff in the paper used as a filler act favourably on the UV stability of TC prints, while higher proportions reduce stability as an effect of photocatalytic oxidation features due the presence of Fe oxides in the sample of natural zeolite tuff [ 5 ].The stability of TC printing inks may also be influenced by the ink composition [ 11 ], i.e., mineral-oil-based TC inks have a lower degree of photostability than that of TC printing inks based on vegetable oil. Rožić and Vukoje showed that microcapsules in UV screen printing ink show higher stability to photo-oxidation compared to microcapsules present in offset print due to the different interactions of TC microcapsules with the ink binder from their chemical composition [ 10 ]. Despite the fact that TC printing inks have low UV stability, the overprint UV protection of TC prints was not intensively studied.…”

Section: Introductionmentioning

confidence: 99%

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Improvement in Thermochromic Offset Print UV Stability by Applying PCL Nanocomposite Coatings

et al. 2022

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Thermochromic (TC) printing inks change their colouration as a response to a change in temperature. This ability renders them attractive for various applications such as smart packaging, security printing, and marketing, but their application is limited due to their low UV stability, i.e., loss of their thermochromic effect when exposed to UV radiation. In order to improve the UV stability of TC prints, one offset TC printing ink was printed and coated with nanomodified polycaprolactone (PCL) coating. The coating was prepared with the incorporation of 1%, 2%, and 3% mass ratios of ZnO and TiO2 nanoparticles in the PCL matrix. The prepared nanocomposite coatings were applied onto the TC print and exposed to UV radiation; afterwards, they were characterized by the colour properties of prints, SEM microscopy, FTIR, and fluorescence spectroscopy. SEM microscopy, FTIR, and fluorescence spectroscopy showed higher rates of polymer degradation, and the results of colour stability indicated that 3% TiO2 in PCL matrix gave the best UV stability and protection of TC prints.

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