Zeziphi izinto ezichaphazela ukunyangwa kunye nokomiswa kweengubo ze-UV eziphuma emanzini

Zininzi izinto ezichaphazela ukunyangwa kunye nokomiswa kweengubo ze-UV eziphuma emanzini xa usebenzisa umatshini wokunyanga we-UV.Eli phepha lixoxa kuphela ngezinto eziphambili.Le miba ibandakanya le miba ilandelayo:

1. Isiphumo sokomiswa kwangaphambili kwesixokelelwano samanzi kunyango lwe-UV

Iimeko zokomisa ngaphambi kokunyanga zinempembelelo enkulu kwisantya sokunyanga.Xa ingomile okanye ingaphelelanga, isantya sokunyanga sihamba kancinci, kwaye izinga le-gelation alinyuki kakhulu kunye nokwandiswa kwexesha lokuvezwa.Oku kungenxa yokupakishwa okungaphezulu.Nangona amanzi anempembelelo ethile ekuvimbeleni i-polymerization ye-oksijeni, inokwenza kuphela umphezulu wefilimu ye-inki uqiniswe ngokukhawuleza, kuphela ukuphumeza ukomiswa komphezulu, kodwa kungekhona ukufezekisa ukomisa okuqinileyo.Njengoko inkqubo iqulethe umthamo omkhulu wamanzi, inkqubo ixhomekeke kwimigangatho kunye nesatifikethi xa unyanga kwiqondo lokushisa elithile.Ngokunyuka ngokukhawuleza kwamanzi phezu kwefilimu ye-inki, ubuso befilimu ye-inki buqina ngokukhawuleza, kwaye amanzi kwifilimu kunzima ukubalekela.Umthamo omkhulu wamanzi uhlala kwifilimu ye-inki, ukuthintela ukuhlanganiswa okuqhubekayo kunye nobungqina befilimu ye-inki kunye nokunciphisa isantya sokunyanga.Ukongeza, ubushushu bendawo ngexesha lokukhanya kwe-UV kunempembelelo enkulu ekunyangelweni kweengubo ze-UV.Okukhona iqondo lobushushu liphezulu, kokukhona ipropati yokunyanga ngcono.Ngoko ke, ukuba i-preheating isetyenzisiwe, ipropati yokunyanga yengubo iya kunyuswa kwaye i-adhesion iya kuba ngcono.

2. Impembelelo ye-photoinitiator kwi-Waterborne UV yokunyanga

I-photoinitiator kufuneka ibe ne-miscibility ethile kunye nenkqubo yokunyanga ye-UV esekelwe emanzini kunye nokuguquguquka komphunga wamanzi aphantsi, ukwenzela ukuba i-photoinitiator isasazwe, ehambelana nesiphumo esanelisayo sokunyanga.Ngaphandle koko, ngexesha lenkqubo yokumisa, i-photoinitiator iya kuguqa kunye nomphunga wamanzi, ukunciphisa ukusebenza kakuhle komqalisi.Iifotonitiators ezahlukeneyo zokupakishwa kwecuba zinamaza awohlukeneyo okufunxa.Ukusetyenziswa kwabo okudityanisiweyo kunokufunxa ngokupheleleyo imitha ye-ultraviolet yobude bamaza ahlukeneyo, ukuphucula ukufunxwa kwemitha ye-ultraviolet, kwaye ikhawulezise kakhulu isantya sokunyanga ifilimu ye-inki.Ke ngoko, ifilimu ye-inki enesantya sokunyanga ngokukhawuleza kunye nokusebenza okugqwesileyo inokufumaneka ngokusebenzisa iindidi zeefotonitiators kunye nokulungelelanisa umlinganiselo weefotoinitiator ezahlukeneyo.Umxholo wefotonitiator ehlanganisiweyo kwisistim kufuneka uphuhliswe ngokufanelekileyo, uphantsi kakhulu awuhambisani nokhuphiswano lokufunxa ngee-pigments;Ukukhanya okuninzi akukwazi ukungena kwi-coating ngokutyibilikayo.Ekuqaleni, inqanaba lokunyanga lokugquma liyanda ngokunyuka kwefotonitiator ehlanganisiweyo, kodwa xa idosi yefotonitiator ehlanganisiweyo inyuka ukuya kwixabiso elithile, kwaye emva koko inyusa umxholo wayo, inqanaba lokunyanga liya kuncipha.

3. Impembelelo ye-UV yokunyanga i-resin ephuma emanzini ekunyangelweni kwe-UV

I-resin enyangekayo ye-UV esekwe emanzini idinga ukupakishwa okuguquguqukayo kwe-radical light yasimahla, efuna ukuba iimolekyuli ze-resin kufuneka zibe namaqela angaxutywanga.Ngaphantsi kwe-irradiation yokukhanya kwe-ultraviolet, amaqela angaxutywanga kwiimolekyuli adibeneyo, kwaye i-coating ye-liquid iba yinto eqinile.Ngokuqhelekileyo, indlela yokwazisa i-acryloyl, i-methacryloyl, i-vinyl ether okanye i-allyl yamkelwa ukwenza i-resin yokwenziwa ibe ne-unsaturated group certification, ukwenzela ukuba ingaphiliswa phantsi kweemeko ezifanelekileyo.I-Acrylate isetyenziswa rhoqo ngenxa yomsebenzi wayo ophezulu wokuphendula.Kwinkqubo yokunyanga ye-radical ye-UV yamahhala, kunye nokunyuka komxholo webhondi kabini kwi-molecule, isantya se-crosslinking sefilimu siya kunyuka, kwaye isantya sokunyanga siya kukhawuleza.Ngaphezu koko, iirasi ezinezakhiwo ezahlukeneyo zineempembelelo ezahlukeneyo kwireyithi yokunyanga.Umsebenzi wokusabela wamaqela ahlukeneyo asebenzayo ngokubanzi unyuka ngolu hlobo lulandelayo: i-vinyl ether < allyl < methacryloyl < acryloyl.Ke ngoko, i-acryloyl kunye ne-methacryloyl ziye zaziswa ngokubanzi ukwenza i-resin ibe nesantya sokunyanga esikhawulezayo.

4. Impembelelo yee-pigments kwi-UV yokunyanga ii-Coatings eziphuma emanzini

Njengenxalenye engeyiyo i-photosensitive kwi-Waterborne UV yokunyanga ii-pigments zikhuphisana nabaqalisi ukufunxa ukukhanya kwe-UV, okuchaphazela kakhulu iimpawu zokunyanga ze-UV yokunyanga.Ngenxa yokuba i-pigment inokufunxa inxalenye yamandla emitha, iya kuchaphazela ukugcinwa kwefotoinitiator yezixhobo zokufunxa ukukhanya, kwaye emva koko ichaphazele ukuxinana kweeradicals zasimahla ezinokuveliswa, eziya kunciphisa isantya sokunyanga.Umbala ngamnye wepigment unokufunxeka okwahlukileyo (ukudluliselwa) ukuya kumaza ahlukeneyo okukhanya.Incinci i-absorptivity ye-pigment, i-transmittance enkulu, kwaye ngokukhawuleza isantya sokunyanga sengubo.Ikhabhoni emnyama inomthamo ophezulu wokufunxa i-ultraviolet kunye neyona ndlela icothayo yokunyanga.Ibala elimhlophe linepropathi eyomeleleyo ebonakalisayo, ekwathintela ukunyanga.Ngokubanzi, ulandelelwano lokufunxwa kokukhanya kwe-ultraviolet yile: Mnyama > purple > Blue > cyan > Green > yellow > yellow.

Umlinganiselo owahlukileyo kunye nokugxininiswa kwe-pigment efanayo kuneempembelelo ezahlukeneyo kwisantya sokunyanga sefilimu ye-inki.Ngokunyuka komxholo we-pigment, izinga lokunyanga ifilimu ye-inki lehlile ngamaqondo ahlukeneyo.Isixa se-pigment emthubi sinempembelelo enkulu kwiqondo lokunyanga ifilimu ye-inki, ilandelwa yi-pigment ebomvu kunye ne-green pigment.Ngenxa yokuba umnyama unelona zinga liphezulu lokufunxa ukukhanya kwe-ultraviolet, okwenza ukuhanjiswa kwe-inki emnyama kube yeyona nto iphantsi, utshintsho lwedosi yalo alunampembelelo icacileyo kwireyithi yokunyanga ifilimu ye-inki.Xa isixa se-pigment sikhulu kakhulu, isantya sokunyangwa kobuso befilimu ye-inki sikhawuleza kuneso sepleyiti, kodwa ibala elikumphezulu lifunxa isixa esikhulu sokukhanya kwe-ultraviolet, nto leyo enciphisa ukuhanjiswa kokukhanya kwe-ultraviolet. kwaye ichaphazela ukunyangwa komgangatho onzulu wefilimu ye-inki, okukhokelela kuluhlu olungaphezulu lwe-inki lokunyanga ifilimu kodwa umaleko ongezantsi unganyangeki, okulula ukuvelisa "umbimbi" isiganeko.