Oligomers-ka Waxqabadka Gaarka ah

1.Oligomers-ka laba-cirbadaysan

Haddii oligomer uu ka kooban yahay laba nooc oo kala duwan oo kooxo firfircoon oo firfircoon oo loogu talagalay daaweynta, sida koox acrylate ah oo mari karta daaweynta xorta ah ee xagjirka ah, iyo koox kale oo mari karta sawir-qaadista cationic, daaweynta qoyaanka, daaweynta hydroxyl, ama daaweynta kulaylka, markaa waxaa loo yaqaan oligomer laba-daaweyn ah.

Iyada oo la adeegsanayo bisphenol A epoxy resin iyo acrylic acid falgalka esterification ee furitaanka giraanta [kooxda epoxy: kooxda carboxy = (1.5 ~ 2.0): 1, saamiga molar], resin epoxy acrylate oo ka kooban kooxaha epoxy ayaa la diyaariyaa. Kooxaha acrylic-ga waxay mari karaan polymerization xor ah, halka kooxaha epoxy-ga ay mari karaan photopolymerization cationic ama daaweynta kulaylka. Natiijooyinka cilmi-baaristu waxay muujinayaan in uu jiro is-dhexgal gudaha molecular ah oo u dhexeeya labadan kooxood ee firfircoon ee firfircoon, kaas oo si wax ku ool ah u horumarin kara horumarka labadaba photopolymerization xor ah iyo cationic, si weyn u hagaajin kara heerka falcelinta iyo heerka beddelka kama dambaysta ah, iyadoo si weyn u yareynaysa joojinta oksijiinta. Filimka la daaweeyay ee ay sameeyeen oligomers-ka laba-daaweynta ah wuxuu muujinayaa sifooyin farsamo oo wanaagsan.

Marka la falgalo hexamethylene diisocyanate iyadoo la adeegsanayo N,N-bis(3-aminopropyltriethoxysilane), oo ay ku xigto falgal hydroxyethyl acrylate, polyurethane acrylate nooca siloxane ah oo leh labadaba sawir-qaadis xor ah oo xagjir ah iyo sifooyin daaweyn laba-geesood ah oo qoyaan-daweyn ah. Tan waxaa loo isticmaali karaa dahaarka sawir-qaadista ee la daaweyn karo.

Isku-darka resins-ka phenolic epoxy acrylate ee ka kooban kooxaha epoxy waxay keenaysaa agab leh labadaba sawir-qaadis xor ah iyo shaqo-qabasho laba-cirifood ah oo kuleyl ah, kuwaas oo loo isticmaali karo iska caabinta alxanka sawir-qaadista leh.

2.Oligomers-ka Iskood u Bilaabanaya

Waxaa jira laba nooc oo oligomers ah oo leh shaqooyin iskood isu bilaabaya:

1. Oligomer-ku laftiisu wuxuu leeyahay awood uu ku abuuro sawir-qaadis, sidaa darteed sawir-qaadis dheeraad ah ama xitaa looma baahna in lagu daro qaab-dhismeedka.
2. Koox sawir-qaadis ah ayaa lagu daraa oligomer-ka, taasoo u rogta sawir-qaadis macromolecular ah oo u shaqeeya labadaba oligomer-ka iyo sawir-qaadis ahaan qaab-dhismeedka.

Nooca ugu horreeya ee oligomer-ka iskiis u bilaaba waa badeeco cusub oo ay soo saartay shirkadda Mareykanka ee Ashland. Waxaa lagu diyaariyaa falgal ku darid Michael ah oo u dhexeeya esters-ka acrylate ee multifunctional iyo β-ketoesters (sida ethyl acetoacetate, allyl acetoacetate, iyo 2-acetoacetooxyethyl methacrylate). Kaarboonka methylene ee firfircoon ee ku jira β-ketoester wuxuu sameeyaa xiriir cusub oo covalent ah oo leh kaarboonka terminal-ka ee isku xidhka labajibbaaran ee kaarboon-kaarboon ee acrylate. Kooxda kaarboonyl ee ku jirta β-ketoester waxay ku xiran tahay atom kaarboon oo si buuxda loo beddelay. Xidhiidhkani waa mid aan degganayn iftiinka ultraviolet-ka. Ka dib marka uu nuugo iftiinka UV, si fudud ayuu u jabaa, isagoo soo saaraya xagjirka xorta ah ee acetyl iyo xagjirka xorta ah ee macromolecular kale, taasoo siinaysa awood is-bilaabid ah.

Sidaa darteed, dahaarka UV-ga, khadadaha, iyo dhejisyada lagu sameeyay oligomers-ka iskood u bilaaba, sawir-qaade dheeraad ah ayaa loo baahan yahay ama ma jiro. Tani waxay ka hortagtaa dhibaatooyinka sida urta, huruudaynta, dhibka isku darka, roobka, socdaalka, iyo kharashka badan ee la xiriira ku darista sawir-qaadayaasha dhaqameed.

Oligomers-ka iskood u bilaaba ayaa sidoo kale lagu diyaarin karaa iyada oo loo marayo falcelinno u dhexeeya esters-ka acrylate-ka kala duwan iyo deeq-bixiyeyaasha Michael ee kala duwan, iyagoo samaynaya taxane badeecooyin ah.

Noocyada Acrylate waxaa ka mid ah: acrylate, epoxy acrylate, polyurethane acrylate, polyester acrylate, silicone acrylate, melamine acrylate, perfluoroacrylate, fumarate, iyo maleate. Kuwa Michael deeqayaasha ah waxaa ka mid ah: β-ketoesters, β-diketones, β-ketoamides, β-ketoanilides, iyo kuwa kale. Kooxda R' ee ku jirta Michael deeq bixiyaha waxay noqon kartaa koox shaqaynaysa ama koox laba-daaweyn ah.

Nooca labaad ee oligomer-ka iskiis u bilaaba waxaa inta badan lagu diyaariyaa iyadoo la falgalayo photoinitiators-ka ku jira hydroxyl (sida benzoin, 1173, 184, 2959) oo leh oligomers oo ka kooban kooxo isocyanate ah, sidaas darteedna photoinitiator-ka lagu tallaalayo oligomer-ka si loo abuuro photoinitiator macromolecular ah oo leh koox bilow ah oo ku dhex jirta.

Faa'iidooyinka oligomers-ka sawir-qaadayaasha ee lagu tallaalay:

1. Heerka sawir-qaadista wuxuu ku dhow yahay kan oligomers-ka caadiga ah oo ay weheliso sawir-qaadayaasha molecule-yada yaryar.
2. Waafaqsanaan wanaagsan oo nidaamka ah.
3. Si weyn ayay u yareysaa awoodda socdaalka ee sawir-qaadaha.
4. Waxay yareysaa soo saarista alaabada burburka sawir-qaadista ee waxyeelada leh ee ka yimaada sawir-qaadaha (sida benzaldehyde).
5. Qalabka sawir-qaadaha ah ma aha mid sun ah oo aan waxyeello lahayn, taasoo ka dhigaysa mid ku habboon in loo isticmaalo dahaarka iyo khadyada baakadaha cuntada.

Xogtu waxay muujinaysaa in wax soo saarka falgalka tallaalidda ee sawir-qaadayaasha ay si weyn u yareeyaan awoodda socdaalka iyo daadinta ee jajabyada bilaabayaasha, xaddiga benzaldehyde ee laga soo saaro filimka la daaweeyay ayaa sidoo kale si weyn hoos ugu dhacay. Sidaa darteed, ku tallaalidda sawir-qaadayaasha oligomers waxay asal ahaan abuurtaa fasal sawir-qaadayaasha macromolecular kuwaas oo aan sun ahayn oo aan waxyeello lahayn. Waxaa loo isticmaali karaa dahaarka iyo khad loogu talagalay baakadaha cuntada iyo dawooyinka. Sannadkii 2006, Maamulka Cuntada iyo Dawooyinka ee Mareykanka (FDA) ayaa ku dhawaaqday in dahaarka UV iyo khad lagu soo saaro iyadoo la adeegsanayo sawir-qaadayaasha macromolecular loo isticmaali karo daabacaadda baakadaha cuntada iyo dawooyinka, taasoo si buuxda u beddelaysa dhaqankii hore halkaas oo khadyada UV iyo dahaarka aan loo isticmaali karin baakadaha cuntada iyo dawooyinka, iyo furitaanka goob cusub oo loogu talagalay codsiyada khad UV iyo dahaarka.

3.Oligomers-ka Miis-hoose

Dhammaadkii qarnigii 20-aad, tiknoolajiyad cusub oo loogu talagalay agabka la sawiri karo - daabacaadda inkjet-ka UV - ayaa soo baxday. Daabacaadda inkjet waa hab daabacaad aan taabasho lahayn oo aan u baahnayn taarikada daabacaadda. Waxay sameysaa sawirro iyadoo dhibcaha khad ku shubaysa substrate. Iyada oo wax ka beddelaysa sawirada iyo qoraalka iyada oo loo marayo kombuyuutar iyo xakamaynta madaxa daabacaadda si ay dhibcaha khadku si sax ah ugu soo baxaan, waa hab sawir qaadis oo dhijitaal ah oo dhammaystiran. Hadda waa mid ka mid ah hababka sawir-qaadista dhijitaalka ah ee ugu dhaqsaha badan, iyadoo bixisa faa'iidooyinka daabacaadda marka la dalbado, xawaaraha sare, tayada sare, iyo midabada firfircoon.

Waxa ugu muhiimsan ee loo isticmaalo daabacaadda inkjet-ka UV waa khad inkjet ah oo UV ah, kaas oo u baahan in khadku yeesho daxal hoose, xawaare sare oo bogsiin ah, xasillooni midab wanaagsan, iyo in aan la kala bixin.