Ama-Oligomers Okusebenza Okukhethekile

1.Ama-Oligomers Aphulukisa Kabili

Uma i-oligomer iqukethe izinhlobo ezimbili ezahlukene zamaqembu asebenzayo okwelapha, njengeqembu le-acrylate elingadlula ekuphulukisweni okukhululekile, kanye nelinye iqembu elingadlula ekuphonsweni kwe-cationic, ekuphonsweni komswakama, ekuphonsweni kwe-hydroxyl, noma ekuphonsweni okushisayo, khona-ke ibizwa ngokuthi i-oligomer ephindwe kabili.

Kusetshenziswa i-bisphenol A epoxy resin kanye ne-acrylic acid ekusabeleni kwe-ring-opening esterification [iqembu le-epoxy: iqembu le-carboxyl = (1.5 ~ 2.0): 1, isilinganiso se-molar], kulungiswa i-epoxy acrylate resin equkethe amaqembu e-epoxy. Amaqembu e-acrylic angadlula ku-free-radical polymerization, kuyilapho amaqembu e-epoxy angadlula ku-cationic photopolymerization noma ku-thermal curing. Imiphumela yocwaningo ikhombisa ukuthi kukhona ukusebenzisana kwangaphakathi kwama-molecule phakathi kwala maqembu amabili asebenzayo, okungakhuthaza ngempumelelo intuthuko ye-free-radical kanye ne-cationic photopolymerization, okuthuthukisa kakhulu izinga lokusabela kanye nezinga lokuguqulwa kokugcina, ngenkathi kunciphisa kakhulu ukuvinjelwa komoya-mpilo. Ifilimu ephulukisiwe eyakhiwe yi-oligomers e-dual-cure ibonisa izakhiwo ezingcono zemishini.

Ngokuphendula i-hexamethylene diisocyanate nge-N,N-bis(3-aminopropyltriethoxysilane), kulandelwe ukusabela nge-hydroxyethyl acrylate, i-siloxane-type polyurethane acrylate enezakhiwo ezimbili zokupholisa umswakama kanye nokwelapha umswakama. Lokhu kungasetshenziswa ekumbozweni kwe-conformal okunokwelashwa.

Ukuhlanganiswa kwama-resin e-phenolic epoxy acrylate aqukethe amaqembu e-epoxy kuphumela ezintweni ezinemisebenzi yokwelapha ephindwe kabili kanye neyokwelapha ngokushisa okuphindwe kabili, engasetshenziswa kuma-solder resist atholakala ngesithombe.

2.Ama-Oligomer Aziqalela Odwa

Kunezinhlobo ezimbili zama-oligomers anemisebenzi yokuziqala:

1. I-oligomer ngokwayo inekhono lokusungula isithombe, ngakho-ke kuncane kakhulu noma akukho nhlobo i-photoinitiator eyengeziwe okudingeka ifakwe ekwakhiweni.
2. Iqembu eliqala nge-photoinitiating lifakwa ku-oligomer, liyiguqule ibe yi-photoinitiator yama-macromolecular esebenza njenge-oligomer kanye ne-photoinitiator ekwakhiweni.

Uhlobo lokuqala lwe-oligomer oluziqalela lona luwumkhiqizo omusha owakhiwe yinkampani yaseMelika i-Ashland. Lulungiselelwa ngokusabela kokwengeza kukaMichael phakathi kwama-ester e-acrylate asebenzayo amaningi kanye nama-β-ketoesters (njenge-ethyl acetoacetate, i-allyl acetoacetate, kanye ne-2-acetoacetoxyethyl methacrylate). I-methylene carbon esebenzayo ku-β-ketoester yakha isibopho esisha se-covalent ne-terminal carbon yesibopho se-carbon-carbon esiphindwe kabili se-acrylate. Iqembu le-carbonyl ku-β-ketoester lixhunywe ku-athomu yekhabhoni efakwe ngokuphelele. Lesi sibopho asizinzile ngaphansi kokukhanya kwe-ultraviolet. Ngemva kokumunca ukukhanya kwe-UV, siphuka kalula, sikhiqize i-acetyl free radical kanye nenye i-macromolecular free radical, ngaleyo ndlela inikeze ikhono lokuziqalela lona.

Ngakho-ke, ezimbozweni ze-UV, uyinki, kanye nezinamathiseli ezakhiwe ngama-oligomer aziqambayo, kudingeka i-photoinitiator encane noma ayidingeki nhlobo. Lokhu kugwema izinkinga ezifana nephunga, ukuphuzi, ubunzima bokuxuba, imvula, ukufuduka, kanye nezindleko eziphakeme ezihambisana nokwengeza ama-photoinitiator endabuko.

Ama-oligomer aziqalela wona angalungiswa ngokusebenzisa ukusabela phakathi kwama-ester ahlukahlukene e-acrylate kanye nabanikeli abahlukahlukene bakaMichael, okwenza uchungechunge lwemikhiqizo.

Izinhlobo ze-acrylate zifaka: i-acrylate, i-epoxy acrylate, i-polyurethane acrylate, i-polyester acrylate, i-silicone acrylate, i-melamine acrylate, i-perfluoroacrylate, i-fumarate, kanye ne-maleate. Abanikeli bakaMichael bafaka: ama-β-ketoesters, ama-β-diketones, ama-β-ketoamides, ama-β-ketoanilides, nabanye. Iqembu le-R' kumnikeli kaMichael lingaba yiqembu elisebenzayo noma iqembu elinokwelapha okubili.

Uhlobo lwesibili lwe-oligomer oluziqalela ngokwalo lulungiswa kakhulu ngokusebenzisa ama-photoinitiator aqukethe i-hydroxyl (njenge-benzoin, 1173, 184, 2959) nama-oligomer aqukethe amaqembu e-isocyanate, ngaleyo ndlela afake i-photoinitiator ku-oligomer ukuze kudalwe i-photoinitiator yama-macromolecular eneqembu eliqalayo elakhelwe ngaphakathi.

Izinzuzo zama-oligomers e-photoinitiator ahlanganisiwe:

1. Izinga lokuthwebula izithombe liseduze nelama-oligomer avamile ahlanganiswe nama-photoinitiator amancane.
2. Ukuhambisana okuhle nohlelo.
3. Kunciphisa kakhulu ikhono lokufuduka kwe-photoinitiator.
4. Kunciphisa ukukhiqizwa kwemikhiqizo eyingozi yokubola kwe-photo evela ku-photoinitiator (njenge-benzaldehyde).
5. I-photoinitiator ayinabo ubuthi futhi ayinangozi, okwenza ifaneleke ukusetshenziswa ekumbozeni nasekufakeni uyinki wokupakisha ukudla.

Idatha ikhombisa ukuthi imikhiqizo yokusabela kokuxhunyelelwa kwama-photoinitiators inciphisa kakhulu ukufuduka kanye nekhono lokuphuma kwezingcezu zeziqalisi, futhi inani le-benzaldehyde elikhiqizwa kwifilimu elungisiwe nalo lincishisiwe kakhulu. Ngakho-ke, ukuxhunyelelwa kwama-photoinitiators kuma-oligomers empeleni kudala isigaba sama-photoinitiators ama-macromolecular angenabo ubuthi futhi angenangozi. Angasetshenziswa ekumbozweni nakuyinki kokudla kanye nokupakisha kwemithi. Ngo-2006, i-US Food and Drug Administration (FDA) yamemezela ukuthi ukugqunyelelwa kwama-UV kanye noyinki okhiqizwa kusetshenziswa ama-photoinitiators ama-macromolecular kungasetshenziswa ekuphrintiweni kokupakisha kokudla kanye nemithi, okushintsha ngokuphelele umkhuba wangaphambilini lapho ama-ink kanye nokugqoka kwe-UV kwakungenakusetshenziselwa ukupakisha ukudla kanye nemithi, futhi kuvula insimu entsha yezinhlelo zokusebenza ze-UV kanye nokufaka.

3.Ama-Oligomer Aphansi Okuvinjelwa

Ekupheleni kwekhulu lama-20, kwavela ubuchwepheshe obusha bezinto ezitholwa kalula — ukuphrinta i-inkjet ye-UV —. Ukuphrinta i-inkjet kuyindlela yokuphrinta engadingi amapuleti okuphrinta. Yakha izithombe ngokufaka amaconsi e-inki endaweni engaphansi. Ngokuhlela ihluzo nombhalo ngekhompyutha nokulawula ikhanda lokuphrinta ukukhipha amaconsi e-inki ngokunemba, kuyinqubo yokuthwebula izithombe zedijithali ngokugcwele. Njengamanje ingenye yezindlela zokuthwebula izithombe zedijithali ezithuthuka ngokushesha, ezinikeza izinzuzo zokuphrinta okufunwayo, isivinini esiphezulu, ikhwalithi ephezulu, nemibala egqamile.

Okubaluleke kakhulu ekuphrinteni i-UV inkjet yi-inki ye-UV inkjet, edinga ukuthi i-inki ibe ne-viscosity ephansi, isivinini esikhulu sokupholisa, ukuqina okuhle kombala, kanye nokungabi namanzi.