UV zářením vytvrzované inkousty pro inkjet tisk

Tejkl, Miroslav

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dc.contributor.advisor	Kaplanová, Marie	cze
dc.contributor.author	Tejkl, Miroslav
dc.date.accessioned	2012-07-15T22:39:14Z
dc.date.available	2012-07-15T22:39:14Z
dc.date.issued	2012
dc.identifier	Univerzitní knihovna (sklad)	cze
dc.identifier.uri	http://hdl.handle.net/10195/45513
dc.description.abstract	Pojivove systemy inkjetovych inkoustů a laků vytvrzovanych UV zařenim jsou nejčastěji založeny na akrylatovych monomerech a oligomerech polymerujicich radikalovym mechanizmem. Na trhu meně uspěšnou a malo rozšiřenou alternativou jsou inkousty a laky obsahujici epoxidove, oxetanove .i vinyletherove monomery polymerujici kationtovym mechanizmem. Oba mechanizmy polymerace maji jine vyhody a nevyhody. Radikalova polymerace je inhibovana kyslikem snadno difundujicim do tenke vrstvy nizkoviskozniho systemu ze vzduchu. Systemy polymerujici kationtovym mechanizmem podlehaji při skladovani pomale předčasne polymeraci, ke ktere dochazi v důsledku nedostatečne stability oniovych soli běžnš uživanych jako fotoiniciatory. V teto praci jsou studovany p.ipravene laky a inkousty obsahujici směs radikalov. a kationtov. polymerujicich materialů a fotoiniciatorů, ktere při expozici UV zařeni polymeruji současně a vytvaři interpenetrujici polymerni sitě. Experimentalni prace byla strukturovana do pěti etap. V prvni etapě byly naformulovany směsi radikalov. a kationtov. polymerujicich monomer. (a oligomeru) s dostatečně nizkou viskozitou splňujici technologicke požadavky dane typem použite tiskove hlavy. Ve druhe etapě byl sledovan vliv některych vybranych materialů na rychlost kationtove polymerace iniciovane UV zařenim s cilem formulovat dostatečně reaktivni kationtov. polymerujici system. T.eti etapa prace byla zam..ena na studium pr.b.hu UV za.enim iniciovane polymerace p.ipravenych bezpigmentovych lak., obsahujicich kationtov. a radikalov. polymerujici slo.ky v r.znych pom.rech, a hodnoceni mechanickych vlastnosti tenkych vytvrzenych vrstev p.ipravenych z t.chto lak.. Polymerace akrylatovych a oxetanovych funk.nich skupin byla sledovana pomoci FTIR za i bez p.istupu vzduchu. Vzorky tenkych vytvrzenych vrstev byly testovany v tahu pomoci dynamometru. Tvrdost vytvrzenych vrstev byla stanovena metodou Persoz. Ve .tvrte etap. byla studovana UV za.enim iniciovana polymerace experimentalnich inkoust. obsahujicich p.ipravenou pigmentovou preparaci ftalocyaninu a stejne podily radikalov. a kationtov. polymerujicich složek. S experimentalnimi inkousty i laky byly provedeny tiskove testy na laboratornim tiskovem za.izeni s inkjetovou hlavou Xaar XJ500/80. V pate etap. byly provedeny testy dlouhodobe stability p.ipraveneho kapalneho laku obsahujiciho stejne podily radikalov. a kationtov. polymerujicich složek. V průběhu několika tydn. tepelne expozice vzork. byl sledovan nar.st viskozity laku v d.sledku p.ed.asne polymerace. Experimentalni laky a inkousty obsahovaly radikalov. polymerujici nizkoviskozni akrylaty, kationtov. polymerujici epoxidove a oxetanove monomery, fotoiniciatory radikalove a kationtove polymerace (?ż-hydroxyketon, iodoniova s.l) a dal.i aditiva. Kationtov. polymerujici monomery a fotoiniciatory byly vybrany tak, aby jejich dostatečně rychla polymerace mohla ovlivnit souběžně probihajici radikalovou polymeraci akrylatů. Současny průběh radikalove a kationtove polymerace sm.snych system. ma p.iznivy vliv na pr.b.h radikalove polymerace obsa.enych akrylat. za p.istupu vzduchu. Rychlost radikalove polymerace se zvy.uje s rostoucim podilem kationtov. polymerujicich slo.ek ve sm.si. Vytvrzene tenke vrstvy lak. obsahujicich sm.s radikalov. a kationtov. polymerujicich slo.ek jsou pru.n.j.i a m.k.i ne. vrstvy lak. obsahujici slo.ky pouze jednoho typu. Experimentalni inkousty obsahujici pigmentovou preparaci bylo nutne vytvrdit v.t.i davkou oza.eni ne. bezpigmentove laky. Nep.iznivy vliv p.itomnosti pigmentu byl .aste.n. kompenzovan p.idavkem fotosenzibilizatoru absorbujiciho i v oblasti del.ich vlnovych delek vyza.ovanych Hg vybojkami pou.ivanymi jako zdroje UV za.eni. Tisk experimentalniho laku i inkoustu byl stabilni, tiskova kvalita byla srovnatelna s kvalitou tisku komer.n. dodavaneho inkoustu. P.ed.asna polymerace experimentalniho laku obsahujiciho stejne podily radikalov. a kationtov. polymerujicich slo.ek b.hem dlouhodobe tepelne exp	cze
dc.format	87 s. + teze	cze
dc.format.extent	10714037 bytes	cze
dc.format.mimetype	application/pdf	cze
dc.language.iso	cze
dc.publisher	Univerzita Pardubice	cze
dc.rights	Bez omezení	cze
dc.subject	Inkjet tisk	cze
dc.subject	inkjet inkoust	cze
dc.subject	inkoust vytvrzovaný UV zářením	cze
dc.subject	souběžná radikálová a kationtová polymerace	cze
dc.subject	interpenetrující polymerní sítě	cze
dc.subject	Inkjet printing	eng
dc.subject	inkjet ink	eng
dc.subject	UV curable ink	eng
dc.subject	simultaneous radical and cationic polymerization	eng
dc.subject	interpenetrating polymeric networks	eng
dc.title	UV zářením vytvrzované inkousty pro inkjet tisk	cze
dc.title.alternative	UV curable inks for inkjet printing	eng
dc.type	disertační práce	cze
dc.contributor.referee	Jančovičová, Viera	cze
dc.contributor.referee	Svoboda, Josef	cze
dc.contributor.referee	Veselý, Michal	cze
dc.date.accepted	2012	cze
dc.description.abstract-translated	UV curable inkjet inks and varnishes are generally based on acrylate monomers and oligomers which undergo photoinitiated radical polymerization. Inks and varnishes based on epoxide, oxetane or vinylether monomers which undergo photoinitiated cationic polymerization are less commercially successful alternative. Both of these polymerization mechanisms have different advantages and disadvantages. Radical polymerization is strongly inhibited by oxygen which easily diffuses into a thin layer of low viscosity system. Cationically polymerizable systems undergo slow premature polymerization during storage. This is a result of insufficient thermal stability of onium salts generally used as photoinitiators. Varnishes and inks studied in this work contained a mixture of radically and cationically polymerizable materials and photoinitiators of both polymerization types. As a result of the UV exposition, both types of the polymerization proceeded simultaneously. This experimental work proceeded in five stages. In the first stage, two mixtures of radically or cationically polymerizable monomers (and oligomer) with a required low viscosity for an inkjet printing was formulated. In the second stage, an influence of selected materials on a rate of cationic polymerization was tested with the aim to formulate a cationically polymerizable system with a required high reactivity. In the third stage, the process of the photopolymerization and mechanical properties of thin layers of the unpigmented experimental varnishes were studied. The varnishes contained different portions of the radically and cationically polymerizable components. The polymerization of acrylate and oxetane functional groups was studied by means of FTIR with and without air presence. The pull tests of the cured thin varnish layers were done using a dynamometer. The pendulum hardness of the cured thin varnish layers were measured by the Persoz method. In the fourth stage, the experimental UV curable inks containing a prepared pigment preparation and equal portions of the radically and cationically polymerizable components were studied. Their photopolymerization was studied by means of FTIR. The print tests of the selected experimental varnish and ink were done using the laboratory printing machine equipped with the inkjet printhead Xaar XJ500/80. In the fifth stage, the long-therm stability tests of the liquid varnish containing equal portions of the radically and cationically polymerizable components were done. During several weeks of the thermal exposition of the liquid samples, the increase of viscosity as result of premature polymerization was monitored. The experimental inks and varnishes consisted of radically polymerizable low viscosity acrylates, cationically polymerizable epoxide and oxetane monomers, photoinitiators of the radical and cationic polymerization (á-hydroxyketone, iodonium salt) and additives. The cationically polymerizable monomers and the photoinitiators were chosen to achieve the sufficiently fast cationic polymerization to affect the simultaneous radical polymerization of the acrylates. The simultaneous cationic polymerization positively affected the radical polymerization of the acrylates in air. The rate of the radical polymerization of the acrylates increased with the content of the cationically polymerizable components in the mixture. The cured thin layers of the experimental varnishes containing mixture of the radically and cationically polymerizable components were more plastic and less hard than the layers containing just one type of these components. The radiation dose needed to cure the experimental inks containing the pigment preparation was higher than in case of the unpigmented varnishes. An adverse effect of the pigment on the UV curing was partially compensated by an addition of a photosensitizer absorbing radiation of longer wavelengths emitted by a Hg lamp used as UV radiation source in printing machines. The process of inkjet printing of	eng
dc.description.department	Katedra polygrafie a fotofyziky	cze
dc.thesis.degree-discipline	Technologie makromolekulárních látek	cze
dc.thesis.degree-name	Ph.D.	cze
dc.thesis.degree-grantor	Univerzita Pardubice. Fakulta chemicko-technologická	cze
dc.identifier.signature	D26828	cze
dc.thesis.degree-program	Chemie a technologie materiálů	cze
dc.identifier.stag	18817	cze
dc.description.grade	Dokončená práce s úspěšnou obhajobou	cze