Ii-Oligomers zeNtsebenzo ekhethekileyo

1.Ii-Oligomers eziPhilisa kabini

Ukuba i-oligomer ineentlobo ezimbini ezahlukeneyo zamaqela asebenzayo okunyanga, njengeqela le-acrylate elinokuvavanywa ngokukhululekileyo, kunye nelinye iqela elinokuvavanywa ngokuphononongwa kwe-cationic, ukunyanga ngokufuma, ukunyanga nge-hydroxyl, okanye ukunyanga ngokushushu, ngoko ke ibizwa ngokuba yi-dual-cure oligomer.

Ukusebenzisa i-bisphenol I-epoxy resin kunye ne-acrylic acid kwi-ring-opening esterification reaction [iqela le-epoxy: iqela le-carboxyl = (1.5 ~ 2.0): 1, i-molar ratio], i-epoxy acrylate resin equlethe amaqela e-epoxy iyalungiswa. Amaqela e-acrylic anokudlula kwi-free-radical polymerization, ngelixa amaqela e-epoxy anokudlula kwi-cationic photopolymerization okanye kwi-thermal curing. Iziphumo zophando zibonisa ukuba kukho ukusebenzisana kwangaphakathi kwe-molecular phakathi kwala maqela mabini asebenzayo, anokukhuthaza ngempumelelo inkqubela ye-free-radical kunye ne-cationic photopolymerization, iphucula kakhulu izinga lokuphendula kunye nezinga lokuguqulwa kokugqibela, ngelixa inciphisa kakhulu ukuthintelwa kwe-oxygen. Ifilimu ephilisiweyo eyenziwe yi-dual-cure oligomers ibonisa iipropati ezingcono zoomatshini.

Ngokuphendula i-hexamethylene diisocyanate nge-N,N-bis(3-aminopropyltriethoxysilane), kulandele ukuphendula nge-hydroxyethyl acrylate, i-siloxane-type polyurethane acrylate eneempawu ze-free-radical photocuring kunye ne-moisture-curing dual-cure ingalungiswa. Oku kungasetyenziswa kwiingubo ze-phototherapy conformal.

Ukwenziwa kwee-resin ze-phenolic epoxy acrylate eziqulethe amaqela e-epoxy kubangela ukuba izixhobo ezinemisebenzi ye-free-radical photocuring kunye ne-thermal curing dual-cure, ezingasetyenziswa kwii-solder resists ezinokufotwa.

2.Ii-Oligomers eziziQalayo

Kukho iintlobo ezimbini ze-oligomers ezinemisebenzi yokuziqalisa:

1. I-oligomer ngokwayo inamandla okuqalisa ngefoto, ngoko ke kufuneka kongezwe i-photoinitiator encinci okanye kungabikho kwanto eyongezelelweyo kwifomyula.
2. Iqela eliqala ngefoto lifakwa kwi-oligomer, liyiguqula ibe yi-macromolecular photoinitiator esebenza njenge-oligomer kunye ne-photoinitiator kwifomyula.

Uhlobo lokuqala lwe-oligomer eziziqalelayo yimveliso entsha eyenziwe yinkampani yaseMelika i-Ashland. Ilungiselelwa ngempendulo yokongeza kaMichael phakathi kwee-esters ze-acrylate ezisebenzayo ezininzi kunye nee-β-ketoesters (ezifana ne-ethyl acetoacetate, i-allyl acetoacetate, kunye ne-2-acetoacetoxyethyl methacrylate). I-methylene carbon esebenzayo kwi-β-ketoester yenza i-covalent bond entsha kunye ne-terminal carbon-carbon bond ye-acrylate's double bond. Iqela le-carbonyl kwi-β-ketoester liqhagamshelwe kwi-atom yekhabhoni ethathelwe indawo ngokupheleleyo. Olu qhagamshelo aluzinzanga phantsi kokukhanya kwe-ultraviolet. Emva kokufunxa ukukhanya kwe-UV, luqhekeka ngokulula, luvelise i-acetyl free radical kunye nenye i-macromolecular free radical, ngaloo ndlela ibonelela ngamandla okuziqalela.

Ngoko ke, kwiingubo ze-UV, ii-inki, kunye nezincamathelisi ezenziwe ngee-oligomers eziziqalelayo, akukho mfuneko ye-photoinitiator eyongezelelweyo okanye akukho mfuneko. Oku kuthintela iingxaki ezifana nevumba, ukuba tyheli, ubunzima bokuxuba, imvula, ukufuduka, kunye neendleko eziphezulu ezinxulumene nokongeza ii-photoinitiators zemveli.

Ii-oligomers eziziqalela zona zingalungiselelwa ngokusebenzisa ii-reactions phakathi kwee-esters ezahlukeneyo ze-acrylate kunye nabaxhasi abahlukeneyo bakaMichael, okwenza uthotho lweemveliso.

Iindidi ze-acrylate ziquka: i-acrylate, i-epoxy acrylate, i-polyurethane acrylate, i-polyester acrylate, i-silicone acrylate, i-melamine acrylate, i-perfluoroacrylate, i-fumarate, kunye ne-maleate. Abanikeli be-Michael baquka: ii-β-ketoesters, ii-β-diketones, ii-β-ketoamides, ii-β-ketoanilides, kunye nezinye. Iqela le-R' kumnikeli we-Michael linokuba liqela elisebenzayo okanye iqela elinonyango oluphindwe kabini.

Uhlobo lwesibini lwe-oligomer eziziqalelayo lulungiswa kakhulu ngokuphendula ii-photoinitiators eziqulethe i-hydroxyl (ezifana ne-benzoin, 1173, 184, 2959) kunye nee-oligomers eziqulethe amaqela e-isocyanate, ngaloo ndlela zifakela i-photoinitiator kwi-oligomer ukuze zenze i-photoinitiator ye-macromolecular eneqela eliqalayo elakhelwe ngaphakathi.

Iingenelo ze-oligomers ze-photoinitiator ezifakelweyo:

1. Izinga lokufota lisondele kwelo lee-oligomers eziqhelekileyo ezidityaniswe nee-photoinitiators ze-molecule encinci.
2. Ukuhambelana okuhle nenkqubo.
3. Kunciphisa kakhulu amandla okufuduka kwe-photoinitiator.
4. Inciphisa ukuveliswa kweemveliso eziyingozi zokubola kwe-photo ezivela kwi-photoinitiator (ezifana ne-benzaldehyde).
5. I-photoinitiator ayinabungozi kwaye ayinabungozi, nto leyo eyenza ukuba ifaneleke ukusetyenziswa kwiingubo kunye nee-inki zokupakisha ukutya.

Idatha ibonisa ukuba iimveliso zokusabela kwe-grafting ze-photoinitiators zinciphisa kakhulu amandla okufuduka kunye nokuphuma kweziqwenga ze-initiator, kwaye ubungakanani be-benzaldehyde obuveliswa kwifilimu ecociweyo nabo buncitshisiwe kakhulu. Ke ngoko, ukufaka ii-photoinitiators kwi-oligomers ngokusisiseko kudala udidi lwee-macromolecular photoinitiators ezingenabungozi kwaye azinabungozi. Zingasetyenziswa kwiingubo kunye nee-inki zokutya kunye neepakeji zamayeza. Ngo-2006, i-US Food and Drug Administration (FDA) yabhengeza ukuba iingubo kunye nee-inki ze-UV eziveliswa kusetyenziswa ii-macromolecular photoinitiators zingasetyenziswa ekuprintweni kwepakeji yokutya kunye namayeza, nto leyo etshintshe ngokupheleleyo indlela yangaphambili apho ii-inki kunye nee-coatings ze-UV bezingenakusetyenziselwa ukupakisha ukutya kunye namayeza, kwaye ivula intsimi entsha ye-UV inki kunye nee-coatings.

3.Ii-Oligomers eziphantsi kwe-Viscosity

Ekupheleni kwenkulungwane yama-20, kwavela iteknoloji entsha yezinto ezinokunyangwa — ukuprinta i-inkjet ye-UV —. Ukuprinta i-inkjet yindlela yokuprinta engadibaniyo nengafuni iipleyiti zokuprinta. Yenza imifanekiso ngokukhupha amaconsi e-inki kwi-substrate. Ngokuhlela imifanekiso kunye nombhalo ngekhompyutha nokulawula intloko yokuprinta ukuba ikhuphe amaconsi e-inki ngokuchanekileyo, yinkqubo yokufota yedijithali ngokupheleleyo. Okwangoku yenye yeendlela zokufota zedijithali eziphuhla ngokukhawuleza, ezibonelela ngeenzuzo zokuprinta okufunekayo, isantya esiphezulu, umgangatho ophezulu, kunye nemibala eqaqambileyo.

Eyona nto isetyenziswa kakhulu xa kuprintwa i-UV inkjet yi-UV inkjet, efuna ukuba i-inki ibe ne-viscosity ephantsi, isantya esiphezulu sokuphiliswa, uzinzo oluhle lwe-pigment, kwaye ingabi na-sedimentation.