Yiziphi izici ezithinta ukuphulukiswa nokomiswa kwezingubo ze-Waterborne UV

Kunezici eziningi ezithinta ukuphulukiswa nokomiswa kwezingubo ze-Waterborne UV uma kusetshenziswa umshini wokwelapha we-UV.Leli phepha lixoxa kuphela ngezinto ezibalulekile.Lezi zici zihlanganisa izici ezilandelayo:

1. Umphumela wokomiswa kwangaphambili kwesistimu ye-aqueous ekwelapheni kwe-UV

Izimo zokomisa ngaphambi kokwelapha zinomthelela omkhulu esivinini sokuphulukisa.Uma isomile noma ingaphelele, isivinini sokuphulukisa sihamba kancane, futhi izinga le-gelation alikhuli kakhulu ngokunwetshwa kwesikhathi sokuchayeka.Lokhu kungenxa yokupakishwa ngokweqile.Nakuba amanzi enomphumela othile ekuvimbeleni i-polymerization ye-oxygen, angenza kuphela ingaphezulu lefilimu ye-inki liqine ngokushesha, kuphela ukufeza ukoma okungaphezulu, kodwa hhayi ukufeza ukoma okuqinile.Njengoba uhlelo luqukethe inani elikhulu lamanzi, uhlelo lungaphansi kwamazinga kanye nesitifiketi lapho lwelashwa ngezinga elithile lokushisa.Ngokuhwamuka okusheshayo kwamanzi ebusweni befilimu kayinki, ingaphezulu lefilimu yeyinki liqina ngokushesha, futhi amanzi akule filimu kunzima ukuphunyuka.Inani elikhulu lamanzi lihlala efilimini ye-inki, okuvimbela ukuhlanganiswa okuqhubekayo nokuqinisekiswa kwefilimu ye-inki nokunciphisa isivinini sokuphulukisa.Ngaphezu kwalokho, izinga lokushisa le-ambient ngesikhathi sokushiswa kwemisebe ye-UV linethonya elikhulu ekwelapheni kwezingubo ze-UV.Uma izinga lokushisa liphezulu, ngcono indawo yokwelapha.Ngakho-ke, uma kusetshenziselwa ukushisa, indawo yokuphulukisa yokugqoka izothuthukiswa futhi ukunamathela kuzoba ngcono.

2. Umthelela we-photoinitiator ekwelapheni kwe-UV ephuma emanzini

I-photoinitiator kufanele ibe nokungahleleki okuthile nesistimu yokuphulukisa ye-UV esekelwe emanzini kanye nokuguquguquka komhwamuko ophansi wamanzi, ukuze isithwebuli sezithombe sihlakazwe, okuhambisana nomphumela owanelisayo wokwelapha.Uma kungenjalo, phakathi nenqubo yokomisa, i-photoinitiator izoshintshashintsha ngomhwamuko wamanzi, inciphise ukusebenza kahle komqalisi.Ama-photoinitiators ahlukene wokupakishwa kukagwayi anobude obuhlukile bokumuncwa.Ukusetshenziswa kwazo okuhlangene kungamunca ngokugcwele imisebe ye-ultraviolet yamaza ahlukene, kuthuthukise ukumuncwa kwemisebe ye-ultraviolet, futhi kusheshise kakhulu izinga lokuphulukiswa kwefilimu kayinki.Ngakho-ke, ifilimu kayinki enezinga lokuphulukisa ngokushesha nokusebenza okuhle kakhulu ingatholwa ngokusebenzisa ama-photoinitiators ahlukahlukene kanye nokulungisa isilinganiso sama-photoinitiators ahlukahlukene.Okuqukethwe kwe-photoinitiator ehlanganisiwe ohlelweni kufanele kuthuthukiswe kahle, okuphansi kakhulu akusizi emqhudelwaneni wokumuncwa ngezingulube;Ukukhanya okuningi kakhulu akukwazi ukungena enamathela ngokushelela.Ekuqaleni, izinga lokuphulukisa le-coating liyakhula ngokukhula kwe-photoinitiator ehlanganisiwe, kodwa uma umthamo we-photoinitiator we-compound ukhuphuka ube inani elithile, bese ukhuphula okuqukethwe kwawo, izinga lokuphulukisa lizokwehla.

3. Umthelela we-Waterborne UV yokuphulukisa inhlaka ekwelapheni kwe-UV

I-resin ye-UV esekelwe emanzini eselaphekayo idinga ukupakishwa okuguquguqukayo kokukhanya kwe-radical mahhala, okudinga ukuthi ama-molecule e-resin kufanele abe namaqembu angagcwele.Ngaphansi kokushiswa kokukhanya kwe-ultraviolet, amaqembu angasetshenzisiwe kuma-molecule axhumene, futhi i-liquid coating iba i-coating eqinile.Ngokuvamile, indlela yokwethula i-acryloyl, i-methacryloyl, i-vinyl ether noma i-allyl iyamukelwa ukwenza i-resin yokwenziwa ibe nesitifiketi seqembu elingasetshenzisiwe, ukuze ilashwe ngaphansi kwezimo ezifanele.I-Acrylate ivame ukusetshenziswa ngenxa yomsebenzi wayo wokusabela ophezulu.Ohlelweni lokuphulukisa i-UV ye-radical yamahhala, ngokwanda kokuqukethwe kwebhondi ephindwe kabili ku-molecule, ijubane lokuxhumanisa lefilimu lizokhula, futhi isivinini sokuphulukisa sizosheshisa.Ngaphezu kwalokho, ama-resin anezakhiwo ezahlukene anemiphumela ehlukene ngesilinganiso sokuphulukisa.Umsebenzi wokusabela wamaqembu ahlukahlukene asebenzayo ngokuvamile ukhuphuka ngokulandelana okulandelayo: i-vinyl ether < allyl < methacryloyl < acryloyl.Ngakho-ke, i-acryloyl ne-methacryloyl ngokuvamile zethulwa ukwenza inhlaka ibe nesivinini sokuphulukisa ngokushesha.

4. Umthelela we-pigments ekwelapheni kwe-UV ye-Waterborne Coatings

Njengengxenye engeyona i-photosensitive kuma-Waterborne UV elaphayo, ama-pigments ancintisana nabaqalisi ukumunca ukukhanya kwe-UV, okuthinta kakhulu izici zokwelapha zesistimu yokwelapha ye-UV.Ngenxa yokuthi i-pigment ingakwazi ukumunca ingxenye yamandla emisebe, izothinta ukugcinwa kwe-photoinitiator yemishini yokumunca ukukhanya, bese ithinta ukuhlangana kwama-radicals mahhala angakhiqizwa, okuzonciphisa isivinini sokuphulukisa.Umbala ngamunye we-pigment unokumuncwa okuhlukile (ukudluliswa) kuya kumaza ahlukene okukhanya.Uma kuncane ukumuncwa kwe-pigment, kukhulu ukudluliswa kwe-pigment, kanye nesivinini sokuphulukisa se-coating.Ikhabhoni emnyama inamandla okumunca i-ultraviolet ephezulu kanye nokwelapha okuhamba kancane.I-white pigment inendawo ekhanyayo eqinile, ephinde ivimbele ukuphulukiswa.Ngokuvamile, ukumuncwa kokukhanya kwe-ultraviolet ithi: Okumnyama > okunsomi > Okuluhlaza okwesibhakabhaka > okuluhlaza okotshani > Okuhlaza > Okuphuzi > okubomvu.

Ingxenye ehlukile nokugxila kwe-pigment efanayo kunemiphumela ehlukile kwisivinini sokuphulukisa sefilimu kayinki.Ngokukhula kokuqukethwe kwe-pigment, izinga lokuphulukisa lefilimu kayinki lehla ngamazinga ahlukahlukene.Inani le-pigment ephuzi linethonya elikhulu ekuphulukisweni kwefilimu kayinki, kulandelwa umbala obomvu nombala oluhlaza okotshani.Ngenxa yokuthi okumnyama kunezinga eliphakeme kakhulu lokumunca lokukhanya kwe-ultraviolet, okwenza ukudluliswa kukayinki omnyama kube phansi kakhulu, ukuguqulwa komthamo wawo akunawo umthelela osobala esilinganisweni sokuphulukiswa kwefilimu kayinki.Lapho inani le-pigment likhulu kakhulu, izinga lokuphulukiswa kongqimba olungaphezulu lwefilimu kayinki liyashesha kunepuleti, kodwa umbala ongaphezulu udonsa ukukhanya okukhulu kwe-ultraviolet, okunciphisa ukudluliswa kokukhanya kwe-ultraviolet. futhi kuthinta ukuphulukiswa kongqimba olujulile lwefilimu kayinki, okuholela ekuphulukiseni ungqimba olungaphezulu lwefilimu ye-inki kodwa ungqimba olungezansi lungapholi, okulula ukukhiqiza into “yokushwabana”.