Pali zinthu zambiri zomwe zimakhudza kuchiritsa ndi kuyanika kwa zokutira za Waterborne UV mukamagwiritsa ntchito makina ochiritsa a UV.Pepalali likungokambirana zazikuluzikulu zokha.Zinthu izi zikuphatikizapo zinthu izi:
1. Zotsatira za kuyanika kusanachitike kwa amadzimadzi pamachiritso a UV
Kuyanika musanayambe kuchiritsa kumakhudza kwambiri kuthamanga kwa machiritso.Pamene sichiwuma kapena chosakwanira, kuthamanga kwa machiritso kumakhala pang'onopang'ono, ndipo mlingo wa gelation suwonjezeka kwambiri ndi kuwonjezereka kwa nthawi yowonekera.Izi ndichifukwa chakulongedza kwambiri.Ngakhale madzi ali ndi zotsatira zina poletsa polymerization wa okosijeni, akhoza kokha pamwamba pa inki filimu kulimba mofulumira, kokha kukwaniritsa pamwamba kuyanika, koma kuti akwaniritse kuyanika olimba.Popeza dongosololi lili ndi madzi ambiri, dongosololi limakhala ndi miyezo ndi chiphaso pochiritsa kutentha kwina.Ndi kutuluka kofulumira kwa madzi pamwamba pa filimu ya inki, pamwamba pa filimu ya inki imalimba mofulumira, ndipo madzi mufilimuyi ndi ovuta kuthawa.Madzi ambiri amakhalabe mufilimu ya inki, kuteteza kuphatikizika kwina ndi kutsimikizira filimu ya inki ndikuchepetsa kuthamanga kwa machiritso.Kuphatikiza apo, kutentha kwapakati pa kuwala kwa UV kumakhudza kwambiri kuchiritsa kwa zokutira za UV.Kutentha kwapamwamba, kumapangitsanso katundu wochiritsa.Choncho, ngati kutenthedwa kukugwiritsidwa ntchito, kuchiritsa katundu wa zokutira kumalimbikitsidwa ndipo kumamatira kudzakhala bwino.
2. Mphamvu ya Photoinitiator pa Waterborne UV kuchiritsa
The photoinitiator ayenera kukhala ndi miscibility zina ndi madzi ozikidwa UV machiritso dongosolo ndi otsika nthunzi nthunzi kusakhazikika madzi, kotero kuti photoinitiator akhoza kumwazikana, amene amathandiza kukhutiritsa machiritso zotsatira.Apo ayi, panthawi yowumitsa, photoinitiator idzagwedezeka ndi mpweya wa madzi, kuchepetsa mphamvu ya woyambitsa.Ma photoinitiators osiyanasiyana onyamula fodya ali ndi mayamwidwe osiyanasiyana.Kugwiritsa ntchito kwawo kophatikizana kumatha kuyamwa bwino cheza cha ultraviolet chamitundu yosiyanasiyana, kuwongolera kuyamwa kwa cheza cha ultraviolet, ndikufulumizitsa kwambiri kuchiritsa kwa filimu ya inki.Chifukwa chake, filimu ya inki yokhala ndi kuchiritsa mwachangu komanso magwiridwe antchito abwino kwambiri imatha kupezeka pogwiritsa ntchito mitundu yosiyanasiyana ya ma photoinitiators ndikusintha chiŵerengero cha ma photoinitiators osiyanasiyana.Zomwe zili pawiri photoinitiator mu dongosolo ziyenera kupangidwa bwino, zotsika kwambiri sizothandiza kuti mayamwidwe mpikisano ndi inki;Kuwala kwambiri sikungalowe mu zokutira bwino.Pachiyambi, kuchiritsa kwa ❖ kuyanika kumawonjezeka ndi kuwonjezeka kwa photoinitiator pawiri, koma pamene mlingo wa photoinitiator umawonjezeka kufika pamtengo wina, ndiyeno umawonjezera zomwe zili, machiritso amatha kuchepa.
3. Zotsatira za utomoni wothira pamadzi wa UV pakuchiritsa kwa UV
Utoto wochirikizidwa ndi UV wopangidwa ndi madzi umafunika kuyika kwaulele kwaulere, komwe kumafunikira kuti ma molekyulu a utomoni akhale ndi magulu osatha.Pansi pa kuyatsa kwa kuwala kwa ultraviolet, magulu osasunthika m'mamolekyu amalumikizana, ndipo chophimba chamadzimadzi chimakhala cholimba.Kawirikawiri, njira yobweretsera acryloyl, methacryloyl, vinyl ether kapena allyl imatengedwa kuti apange utomoni wopangidwa kukhala ndi satifiketi ya gulu, kuti ichiritsidwe pamikhalidwe yoyenera.Acrylate imagwiritsidwa ntchito nthawi zambiri chifukwa cha zochita zake zambiri.Kwa njira yochiritsira ya UV yaulere, ndi kuchuluka kwa zomangira ziwiri mu molekyulu, kuthamanga kwa filimuyo kumawonjezeka, ndipo kuthamanga kwa machiritso kumathamanga.Komanso, ma resin okhala ndi mawonekedwe osiyanasiyana amakhala ndi zotsatira zosiyanasiyana pamlingo wochiritsa.Zochita zamagulu osiyanasiyana ogwira ntchito nthawi zambiri zimawonjezeka motere: vinyl etha < allyl
4. Mphamvu ya ma inki pa machiritso a UV a zokutira za m'madzi
Monga gawo losawoneka bwino mu zokutira zochiritsira za Waterborne UV, ma pigment amapikisana ndi oyambitsa kuyamwa kuwala kwa UV, komwe kumakhudza kwambiri machiritso a njira yochiritsira ya UV.Chifukwa pigment imatha kuyamwa mbali ya mphamvu ya radiation, idzakhudza kukonza kwa photoinitiator kwa zida zoyamwitsa kuwala, ndiyeno zimakhudza kuchuluka kwa ma radicals aulere omwe amatha kupangidwa, omwe angachepetse kuthamanga kwa machiritso.Mtundu uliwonse wa pigment umakhala ndi mayamwidwe osiyanasiyana (kutumiza) kumayendedwe osiyanasiyana a kuwala.Kuchepa kwa mayamwidwe a pigment, kufalikira kwakukulu, komanso kuthamanga kwa machiritso a zokutira.Mpweya wakuda uli ndi mphamvu yoyamwa kwambiri ya ultraviolet komanso kuchiritsa pang'onopang'ono.White pigment ili ndi mphamvu yowunikira, yomwe imalepheretsanso kuchiritsa.Nthawi zambiri, mayamwidwe a kuwala kwa ultraviolet ndi: Black > purple > Blue > cyan > Green > yellow > red.
Kuchuluka kosiyana ndi kuchuluka kwa mtundu womwewo wa pigment kumakhala ndi zotsatira zosiyanasiyana pa liwiro lakuchiritsa la filimu ya inki.Ndi kuchuluka kwa mtundu wa pigment, kuchiritsa kwa filimu ya inki kunatsika mosiyanasiyana.Kuchuluka kwa pigment yachikasu kumakhudza kwambiri kuchiritsa kwa filimu ya inki, kutsatiridwa ndi pigment yofiira ndi mtundu wobiriwira.Chifukwa chakuti wakuda ali ndi mphamvu yochuluka kwambiri yoyamwa ndi kuwala kwa ultraviolet, zomwe zimapangitsa kuti inki yakuda ikhale yotsika kwambiri, kusintha kwa mlingo wake sikumakhudza kwambiri kuchiritsa kwa filimu ya inki.Pamene kuchuluka kwa pigment ndi kwakukulu kwambiri, kuchiritsa kwa pamwamba pa filimu ya inki kumathamanga kwambiri kuposa mbaleyo, koma pigment yomwe ili pamtunda imatenga kuwala kwakukulu kwa ultraviolet, zomwe zimachepetsa kufalikira kwa kuwala kwa ultraviolet. ndipo zimakhudza machiritso akuya wosanjikiza wa inki filimu, chifukwa pamwamba wosanjikiza inki filimu kuchiritsa koma wosanjikiza pansi osachiritsa, amene n'zosavuta kutulutsa "khwinya" chodabwitsa.
Nthawi yotumiza: Jul-05-2022