Oligomers Ochita Zapadera

1.Oligomers Ochiritsa Kawiri

Ngati oligomer ili ndi mitundu iwiri yosiyana ya magulu ogwira ntchito yochiritsa, monga gulu la acrylate lomwe lingadutse mu free-radical curing, ndi gulu lina lomwe lingadutse mu cationic photocuring, moisture curing, hydroxyl curing, kapena thermal curing, ndiye kuti imatchedwa dual-cure oligomer.

Pogwiritsa ntchito bisphenol A epoxy resin ndi acrylic acid mu ring-opening esterification reaction [epoxy group: carboxyl group = (1.5 ~ 2.0): 1, molar ratio], epoxy acrylate resin yokhala ndi magulu a epoxy imakonzedwa. Magulu a acrylic amatha kupangidwa ndi free-radical polymerization, pomwe magulu a epoxy amatha kupangidwa ndi cationic photopolymerization kapena thermal curing. Zotsatira za kafukufuku zikuwonetsa kuti pali mgwirizano wa intramolecular pakati pa magulu awiriwa ogwira ntchito, zomwe zingathandize kwambiri kupita patsogolo kwa free-radical ndi cationic photopolymerization, zomwe zimapangitsa kuti pakhale kusintha kwakukulu kwa reaction rate ndi conversion rate, pomwe zimachepetsa kwambiri kuletsa kwa okosijeni. Filimu yochiritsidwa yopangidwa ndi ma oligomer awiri ochiritsa imakhala ndi mawonekedwe abwino amakina.

Pochita hexamethylene diisocyanate ndi N,N-bis(3-aminopropyltriethoxysilane), kutsatiridwa ndi kuchita ndi hydroxyethyl acrylate, acrylate ya siloxane-type polyurethane yokhala ndi free-radical photocuring komanso moisture-curing dual-cure ikhoza kukonzedwa. Izi zitha kugwiritsidwa ntchito mu zophimba za conformal zomwe zimatha kujambulidwa.

Kupanga ma resini a phenolic epoxy acrylate okhala ndi magulu a epoxy kumabweretsa zinthu zomwe zimakhala ndi ntchito zopanga photocuring zaulere komanso zopanga thermal curing dual-cure, zomwe zingagwiritsidwe ntchito polimbana ndi solder zomwe zimajambulidwa ndi zithunzi.

2.Oligomers Odziyambitsa

Pali mitundu iwiri ya oligomers yokhala ndi ntchito zodziyambitsa:

1. Oligomer yokha ili ndi mphamvu yoyambitsa photo, kotero photoinitiator yochepa kapena yopanda kuwonjezera iyenera kuwonjezeredwa mu kapangidwe kake.
2. Gulu loyambitsa zithunzi limaphatikizidwa mu oligomer, ndikulisandutsa kukhala choyambitsa zithunzi cha macromolecular chomwe chimagwira ntchito ngati oligomer komanso ngati choyambitsa zithunzi mu kapangidwe kake.

Mtundu woyamba wa oligomer wodziyambitsa wokha ndi chinthu chatsopano chomwe chinapangidwa ndi kampani yaku America ya Ashland. Chimakonzedwa kudzera mu njira yowonjezera ya Michael pakati pa ma ester acrylate ambiri ndi ma β-ketoesters (monga ethyl acetoacetate, allyl acetoacetate, ndi 2-acetoacetoxyethyl methacrylate). Kaboni yogwira ntchito ya methylene mu β-ketoester imapanga mgwirizano watsopano wa covalent ndi carbon terminal ya acrylate's carbon-carbon double bond. Gulu la carbonyl mu β-ketoester limalumikizidwa ndi atomu ya carbon yomwe yasinthidwa kwathunthu. Mgwirizanowu ndi wosakhazikika pansi pa kuwala kwa ultraviolet. Pambuyo poyamwa kuwala kwa UV, umasweka mosavuta, ndikupanga acetyl free radical ndi macromolecular free radical ina, motero imapereka mphamvu yodziyambitsa.

Chifukwa chake, mu zophimba za UV, inki, ndi zomatira zopangidwa ndi oligomers zodziyambitsa zokha, photoinitiator yochepa kapena yopanda kufunikira. Izi zimapewa mavuto monga fungo, chikasu, kuvutika kusakaniza, mvula, kusamuka, komanso mtengo wokwera wokhudzana ndi kuwonjezera photoinitiators zachikhalidwe.

Ma oligomer odziyambitsa okha amathanso kukonzedwa kudzera muzochita pakati pa ma ester osiyanasiyana a acrylate ndi opereka osiyanasiyana a Michael, ndikupanga zinthu zingapo.

Mitundu ya acrylate ndi monga: acrylate, epoxy acrylate, polyurethane acrylate, polyester acrylate, silicone acrylate, melamine acrylate, perfluoroacrylate, fumarate, ndi maleate. Opereka Michael ndi awa: β-ketoesters, β-diketones, β-ketoamides, β-ketoanilides, ndi ena. Gulu la R' mu wopereka Michael likhoza kukhala gulu logwira ntchito kapena gulu la dual-cure.

Mtundu wachiwiri wa oligomer wodziyambitsa umakonzedwa makamaka pochita ma photoinitiator okhala ndi hydroxyl (monga benzoin, 1173, 184, 2959) ndi ma oligomer okhala ndi magulu a isocyanate, motero amalumikiza photoinitiator pa oligomer kuti apange photoinitiator ya macromolecular yokhala ndi gulu loyambitsa lomangidwa mkati.

Ubwino wa oligomers a photoinitiator ophatikizidwa:

1. Chiŵerengero cha kupopera kwa zithunzi chili pafupi ndi cha ma oligomer achikhalidwe ophatikizidwa ndi ma photoinitiator ang'onoang'ono a mamolekyulu.
2. Kugwirizana bwino ndi dongosolo.
3. Kuchepetsa kwambiri mphamvu yosamuka ya choyambitsa kuwala.
4. Amachepetsa kupanga zinthu zoopsa zowononga kuwala kuchokera ku chinthu choyambitsa kuwala (monga benzaldehyde).
5. Choyambitsa kuwala kwa dzuwa si poizoni komanso chopanda vuto, zomwe zimapangitsa kuti chigwiritsidwe ntchito popaka utoto ndi inki popangira chakudya.

Deta ikuwonetsa kuti zinthu zomwe zimaphatikizidwa mu photoinitiators zimachepetsa kwambiri kusamuka ndi kutulutsa kwa zidutswa za oyambitsa, ndipo kuchuluka kwa benzaldehyde komwe kumapangidwa mu filimu yokonzedwa kumachepanso kwambiri. Chifukwa chake, kulumikiza photoinitiators pa oligomers kumapanga gulu la ma macromolecular photoinitiators omwe si oopsa komanso osavulaza. Angagwiritsidwe ntchito mu zophimba ndi inki za chakudya ndi mankhwala. Mu 2006, US Food and Drug Administration (FDA) idalengeza kuti zophimba ndi inki za UV zopangidwa pogwiritsa ntchito ma macromolecular photoinitiators zitha kugwiritsidwa ntchito posindikiza chakudya ndi mankhwala, kusintha kwathunthu machitidwe akale pomwe inki ndi zophimba za UV sizingagwiritsidwe ntchito popangira chakudya ndi mankhwala, ndikutsegula munda watsopano wa inki ya UV ndi zophimba.

3.Oligomers Otsika Kwambiri

Kumapeto kwa zaka za m'ma 1900, ukadaulo watsopano wa zinthu zojambulidwa — kusindikiza kwa inkjet ya UV — unayamba. Kusindikiza kwa inkjet ndi njira yosindikizira yosakhudzana ndi kukhudzana yomwe sikufuna mapepala osindikizira. Imapanga zithunzi potulutsa madontho a inki pa substrate. Mwa kusintha zithunzi ndi zolemba kudzera pa kompyuta ndikuwongolera mutu wosindikiza kuti utulutse madontho a inki molondola, ndi njira yojambula ya digito yonse. Pakadali pano ndi imodzi mwa njira zojambulira za digito zomwe zikukula mwachangu, zomwe zimapereka ubwino wosindikiza nthawi iliyonse, liwiro lapamwamba, mtundu wapamwamba, komanso mitundu yowala.

Inki ya UV inkjet yomwe imagwiritsidwa ntchito kwambiri posindikiza inkjet ya UV ndi inki ya UV inkjet, yomwe imafuna kuti inkiyo ikhale ndi kukhuthala kochepa, liwiro lalikulu lotha kuuma, kukhazikika bwino kwa utoto, komanso kuti isagwe.