Krajnović, Ivana (2021) Ekološki održivi bio-nano kompozitni premaz za zaštitu otisaka. Master's thesis - Graduate Programme. Grafički fakultet. [Mentor: Vukoje, Marina].
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Abstract
Termokromne boje (TCI) mijenjaju obojenje pri promjeni temperature. U grafičkoj industriji termokromne boje koriste se prvenstveno kod izrade i tiska „pametne“ ambalaže za prehrambene i farmaceutske proizvode, koja ima funkciju indikatora trenutne temperature proizvoda ili njegove prekoračene temperaturne tolerancije. Kod skladištenja i izlaganja takvih proizvoda moguć je dolazak ambalaže u kontakt s raznim kemikalijama, pri čemu kemijska stabilnost, a time i funkcionalnost termokromnih boja postaje upitna. Polikaprolakton (PCL) je biorazgradivi polimer čije karakteristike nalaze upotrebu u nizu grana industrije. Polikaprolakton može se koristiti kao premaz na otiscima radi poboljšanja njihove kemijske stabilnosti, a može se koristiti i s dodatkom niskog masenog udjela cinkovog oksida (ZnO) ili titanijevog dioksida (TiO2) radi boljih svojstava otisaka. Ovaj rad istražuje utjecaj polikaprolaktona i cinkovog oksida na kemijsku stabilnost i kolorimetrijske karakteristike reverzibilne termokromne boje na bazi leukobojila za tisak u ofsetu s aktivacijskom temperaturom od 45°C. Kemikalije čijim će se utjecajem ovaj rad baviti (voda, sapun, 12%-tni i 96%-tni etanol) izabrane su na temelju procijenjene mogućnosti da će boja u realnoj primjeni doći u kontakt s njima.
| Item Type: | Master's thesis - Graduate Programme |
|---|---|
| Mentor name: | Vukoje, Marina |
| Thesis Committee: | Kulčar, Rahela and Vukoje, Marina and Bolanča Mirković, Ivana |
| Defence date: | 24 September 2021 |
| Abstract in english: | Thermochromic inks (TCI) change their colouration with change in temperature. In graphic industry thermochromic inks are used primarily in making and print of "smart" packaging for food and pharmaceutical packaging, which functions as an indicator of the product's current temperature or an out-of-boundary temperature reading. In the process of storage or display of these products the packaging may come into contact with various chemicals, which may bring into question the chemical stability and therefore functionality of thermochromic ink. Polycaprolactone (PCL) is a biodegradable polymer the characteristics of which find usage in various branches of industry. Polycaprolactone can be used as a coating on printed products in order to improve their chemical stability, as well as used alongside a low mass concentration of zinc oxide (ZnO) or titanium dioxide (TiO2) to further improve the properties of printed products. This paper aims to analyse the effect of polycaprolactone, zinc oxide and titanium dioxide on the chemical stability and colourimetric characteristics of a reversible leuco-dye-based thermochromic ink for use in offset print with the activation temperature of 45°C. The chemicals that this paper will concern itself with (water, soap, 12% and 96% ethanol solution) are chosen on the basis of the estimated possibility that the ink may come into contact with them in reallife conditions. |
| Uncontrolled Keywords: | termokromne boje, leuko bojilo, polikaprolakton, cinkov oksid, titanijev dioksid |
| Keywords in english: | thermochromic ink, leuco dye, polycaprolactone, zinc oxide, titanium dioxide |
| Subjects: | TECHNICAL SCIENCES > Graphic Technology |
| Institution: | Grafički fakultet |
| City: | Zagreb |
| Number of Pages: | 33 |
| Callnumber: | VUK 2021 KRA |
| Inventory number: | DB1013 |
| Depositing User: | Nina Jelača |
| Status: | Unpublished |
| Date Deposited: | 11 Dec 2023 12:27 |
| Last Modified: | 11 Dec 2023 12:27 |
| URI: | http://eprints.grf.unizg.hr/id/eprint/3600 |
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