Cov Oligomers Ua Haujlwm Tshwj Xeeb

1.Cov Oligomers Kho Ob Chav

Yog tias ib qho oligomer muaj ob hom sib txawv ntawm cov pab pawg ua haujlwm rau kev kho, xws li ib pawg acrylate uas tuaj yeem dhau los ntawm kev kho dawb-radical, thiab lwm pawg uas tuaj yeem dhau los ntawm cationic photocuring, moisture curing, hydroxyl curing, lossis thermal curing, ces nws hu ua dual-cure oligomer.

Siv bisphenol A epoxy resin thiab acrylic acid hauv kev sib xyaw ua ke ntawm esterification [epoxy pawg: carboxyl pawg = (1.5 ~ 2.0): 1, molar piv], ib qho epoxy acrylate resin uas muaj epoxy pawg tau npaj. Cov pawg acrylic tuaj yeem dhau los ntawm kev sib xyaw ua ke ntawm cov dawb-radical, thaum cov pawg epoxy tuaj yeem dhau los ntawm cationic photopolymerization lossis thermal curing. Cov txiaj ntsig kev tshawb fawb qhia tau tias muaj kev sib cuam tshuam intramolecular ntawm ob pawg ua haujlwm no, uas tuaj yeem txhawb nqa kev nce qib ntawm ob qho tib si dawb-radical thiab cationic photopolymerization, txhim kho qhov nrawm ntawm cov tshuaj tiv thaiv thiab qhov nrawm hloov pauv kawg, thaum txo qis kev txwv tsis pub oxygen. Cov zaj duab xis kho uas tsim los ntawm dual-cure oligomers qhia txog cov khoom siv kho tshuab zoo dua.

Los ntawm kev sib xyaw hexamethylene diisocyanate nrog N, N-bis (3-aminopropyltriethoxysilane), ua raws li kev sib xyaw nrog hydroxyethyl acrylate, ib qho siloxane-hom polyurethane acrylate nrog ob qho tib si free-radical photocuring thiab moisture-curing dual-cure zog tuaj yeem npaj tau. Qhov no tuaj yeem siv rau hauv photocurable conformal coatings.

Kev tsim cov phenolic epoxy acrylate resins uas muaj epoxy pawg ua rau cov ntaub ntawv nrog ob qho tib si free-radical photocuring thiab thermal curing dual-cure functions, uas tuaj yeem siv rau hauv photoimageable solder resists.

2.Cov Oligomers Pib Tus Kheej

Muaj ob hom oligomers nrog cov haujlwm pib tus kheej:

1. Tus oligomer nws tus kheej muaj peev xwm photoinitiating, yog li me ntsis lossis tsis muaj ntxiv photoinitiator yuav tsum tau ntxiv rau hauv cov mis.
2. Ib pawg photoinitiating tau koom ua ke rau hauv oligomer, tig nws mus rau hauv macromolecular photoinitiator uas ua haujlwm ob qho tib si ua oligomer thiab ua photoinitiator hauv cov qauv.

Hom thawj ntawm tus kheej pib oligomer yog ib yam khoom tshiab tsim los ntawm lub tuam txhab Asmeskas Ashland. Nws tau npaj los ntawm Michael addition reaction ntawm multifunctional acrylate esters thiab β-ketoesters (xws li ethyl acetoacetate, allyl acetoacetate, thiab 2-acetoacetoxyethyl methacrylate). Cov methylene carbon uas nquag ua haujlwm hauv β-ketoester tsim covalent bond tshiab nrog cov carbon kawg ntawm acrylate's carbon-carbon double bond. Pawg carbonyl hauv β-ketoester txuas nrog cov carbon atom hloov pauv tag nrho. Cov bond no tsis ruaj khov hauv qab lub teeb ultraviolet. Tom qab nqus lub teeb UV, nws yooj yim tawg, tsim cov acetyl free radical thiab lwm macromolecular free radical, yog li muab kev muaj peev xwm pib tus kheej.

Yog li ntawd, hauv UV coatings, inks, thiab cov nplaum uas tsim nrog cov oligomers uas pib ua tus kheej, me ntsis lossis tsis muaj photoinitiator ntxiv yog qhov xav tau. Qhov no zam cov teeb meem xws li tsw, daj, nyuaj rau sib tov, nag lossis daus, kev tsiv teb tsaws chaw, thiab tus nqi siab cuam tshuam nrog kev ntxiv cov photoinitiators ib txwm muaj.

Cov oligomers uas pib ua tus kheej kuj tuaj yeem npaj tau los ntawm kev sib xyaw ntawm ntau yam acrylate esters thiab ntau yam Michael donors, tsim cov khoom lag luam.

Cov hom acrylate muaj xws li: acrylate, epoxy acrylate, polyurethane acrylate, polyester acrylate, silicone acrylate, melamine acrylate, perfluoroacrylate, fumarate, thiab maleate. Cov neeg pub Michael muaj xws li: β-ketoesters, β-diketones, β-ketoamides, β-ketoanilides, thiab lwm yam. Pawg R' hauv tus neeg pub Michael tuaj yeem yog ib pawg ua haujlwm lossis ib pawg kho ob npaug.

Hom thib ob ntawm tus kheej pib oligomer feem ntau yog npaj los ntawm kev cuam tshuam cov hydroxyl-muaj photoinitiators (xws li benzoin, 1173, 184, 2959) nrog oligomers uas muaj isocyanate pawg, yog li grafting lub photoinitiator rau ntawm oligomer los tsim cov macromolecular photoinitiator nrog cov pab pawg pib ua ke.

Cov txiaj ntsig ntawm cov photoinitiator oligomers grafted:

1. Tus nqi photocuring yog ze rau qhov ntawm cov oligomers ib txwm muaj ua ke nrog cov photoinitiators me me.
2. Kev sib raug zoo nrog lub kaw lus.
3. Txo qhov muaj peev xwm tsiv teb tsaws chaw ntawm lub photoinitiator.
4. Txo cov cim ntawm cov khoom phom sij photodecomposition los ntawm photoinitiator (xws li benzaldehyde).
5. Tus photoinitiator tsis muaj tshuaj lom thiab tsis ua rau muaj kev phom sij, ua rau nws tsim nyog siv rau hauv cov txheej thiab cov kua mem rau cov khoom noj ntim.

Cov ntaub ntawv qhia tau hais tias cov khoom siv grafting ntawm photoinitiators txo qhov kev tsiv teb tsaws chaw thiab leaching peev xwm ntawm cov khoom pib, thiab qhov ntau ntawm benzaldehyde tsim nyob rau hauv cov zaj duab xis kho kuj tseem txo qis. Yog li ntawd, grafting photoinitiators rau ntawm oligomers yeej tsim ib chav kawm ntawm macromolecular photoinitiators uas tsis muaj tshuaj lom thiab tsis muaj teeb meem. Lawv tuaj yeem siv rau hauv cov txheej thiab inks rau cov khoom noj thiab cov tshuaj ntim. Xyoo 2006, Tebchaws Meskas Food and Drug Administration (FDA) tshaj tawm tias UV coatings thiab inks tsim los ntawm kev siv macromolecular photoinitiators tuaj yeem siv rau hauv cov khoom noj thiab cov tshuaj ntim luam ntawv, hloov pauv tag nrho cov kev coj ua yav dhau los uas UV inks thiab coatings tsis tuaj yeem siv rau cov khoom noj thiab cov tshuaj ntim, thiab qhib ib qho chaw tshiab rau UV ink thiab coating daim ntawv thov.

3.Cov Oligomers Uas Muaj Qhov Tsis Tshua Muaj Viscosity

Thaum kawg ntawm lub xyoo pua 20th, ib lub tshuab tshiab rau cov khoom siv photocurable - UV inkjet printing - tau tshwm sim. Inkjet printing yog ib txoj kev luam ntawv tsis sib cuag uas tsis xav tau cov phaj luam ntawv. Nws tsim cov duab los ntawm kev tso cov kua mem rau ntawm lub substrate. Los ntawm kev kho cov duab thiab cov ntawv nyeem los ntawm lub computer thiab tswj lub taub hau luam ntawv kom tso cov kua mem nrog kev raug, nws yog ib qho txheej txheem digital imaging tag nrho. Tam sim no nws yog ib qho ntawm cov txheej txheem digital imaging ceev tshaj plaws, muab cov txiaj ntsig ntawm kev luam ntawv raws li qhov xav tau, kev ceev ceev, zoo, thiab xim ci ntsa iab.

Cov khoom siv tseem ceeb rau UV inkjet luam ntawv yog UV inkjet number case, uas xav kom cov number case muaj viscosity qis, ceev kho siab, ruaj khov xim zoo, thiab tsis muaj sedimentation.