Nā Oligomers Hana Kūikawā

1.Nā Oligomers Hoʻōla Pālua

Inā loaʻa i kahi oligomer ʻelua ʻano hui hana like ʻole no ka hoʻōla ʻana, e like me kahi hui acrylate hiki ke hoʻōla ʻia me ka radical free, a me kahi hui ʻē aʻe hiki ke hoʻōla ʻia me ka photocuring cationic, ka hoʻōla ʻana i ka wai, ka hoʻōla ʻana i ka hydroxyl, a i ʻole ka hoʻōla wela, a laila ua kapa ʻia ia he oligomer hoʻōla pālua.

Me ka hoʻohana ʻana i ka bisphenol A epoxy resin a me ka acrylic acid i loko o kahi hopena esterification wehe apo [epoxy group: carboxyl group = (1.5 ~ 2.0): 1, molar ratio], ua hoʻomākaukau ʻia kahi epoxy acrylate resin e loaʻa ana nā hui epoxy. Hiki i nā hui acrylic ke hana i ka polymerization free-radical, ʻoiai hiki i nā hui epoxy ke hana i ka cationic photopolymerization a i ʻole ka hoʻōla wela. Hōʻike nā hopena noiʻi aia kahi pilina intramolecular ma waena o kēia mau hui hana ʻelua, hiki ke hoʻolaha pono i ka holomua o ka free-radical a me ka cationic photopolymerization, e hoʻomaikaʻi nui ana i ka helu hopena a me ka helu hoʻololi hope loa, me ka hoʻemi nui ʻana i ka oxygen inhibition. Hōʻike ka ʻili i hoʻōla ʻia i hana ʻia e nā oligomers dual-cure i nā waiwai mechanical maikaʻi aʻe.

Ma ka hoʻopili ʻana i ka hexamethylene diisocyanate me N,N-bis (3-aminopropyltriethoxysilane), a ukali ʻia e ka hoʻopili ʻana me ka hydroxyethyl acrylate, hiki ke hoʻomākaukau ʻia kahi polyurethane acrylate ʻano siloxane me nā waiwai free-radical photocuring a me ka moisture-curing dual-cure. Hiki ke hoʻohana ʻia kēia i nā uhi conformal photocurable.

ʻO ka hana ʻana o nā resins phenolic epoxy acrylate e loaʻa ana nā hui epoxy e hopena i nā mea me nā hana free-radical photocuring a me nā hana thermal curing dual-cure, hiki ke hoʻohana ʻia i nā pale solder photoimageable.

2.Nā Oligomers Hoʻomaka Ponoʻī

ʻElua ʻano o nā oligomers me nā hana hoʻomaka ponoʻī:

1. Loaʻa i ka oligomer ponoʻī ka hiki ke hoʻomaka i ka photoinitiating, no laila ʻaʻohe mea nui a ʻaʻohe paha e pono ai e hoʻohui ʻia i ka photoinitiator hou i loko o ka hoʻohuihui ʻana.
2. Hoʻokomo ʻia kahi hui photoinitiating i loko o ka oligomer, e hoʻolilo ana iā ia i photoinitiator macromolecular e hana ana ma ke ʻano he oligomer a ma ke ʻano he photoinitiator i ka hoʻohuihui ʻana.

ʻO ke ʻano mua o ka oligomer hoʻomaka ponoʻī he huahana hou i hoʻomohala ʻia e ka hui ʻAmelika ʻo Ashland. Hoʻomākaukau ʻia ia ma o kahi hopena hoʻohui Michael ma waena o nā esters acrylate multifunctional a me nā β-ketoesters (e like me ka ethyl acetoacetate, allyl acetoacetate, a me 2-acetoacetoxyethyl methacrylate). ʻO ke kalapona methylene hana i loko o ka β-ketoester e hana i kahi pilina covalent hou me ke kalapona hope o ka pilina pālua carbon-carbon o ka acrylate. Hoʻopili ʻia ka hui carbonyl i loko o ka β-ketoester i kahi ʻātoma kalapona i pani piha ʻia. He paʻa ʻole kēia pilina ma lalo o ke kukui ultraviolet. Ma hope o ka omo ʻana i ke kukui UV, haki maʻalahi ia, e hana ana i kahi radical free acetyl a me kekahi radical free macromolecular, no laila e hāʻawi ana i ka hiki ke hoʻomaka ponoʻī.

No laila, i loko o nā uhi UV, nā ʻīnika, a me nā mea hoʻopili i hana ʻia me nā oligomers hoʻomaka ponoʻī, ʻaʻohe pono o ka photoinitiator hou aʻe. Hōʻalo kēia i nā pilikia e like me ke ʻala, ka melemele, ka paʻakikī i ke kāwili ʻana, ka ua, ka neʻe ʻana, a me ke kumukūʻai kiʻekiʻe e pili ana me ka hoʻohui ʻana i nā photoinitiators kuʻuna.

Hiki ke hoʻomākaukau ʻia nā oligomers hoʻomaka ponoʻī ma o nā hopena ma waena o nā esters acrylate like ʻole a me nā mea hāʻawi Michael like ʻole, e hana ana i kahi moʻo o nā huahana.

ʻO nā ʻano Acrylate: acrylate, epoxy acrylate, polyurethane acrylate, polyester acrylate, silicone acrylate, melamine acrylate, perfluoroacrylate, fumarate, a me maleate. ʻO nā mea hāʻawi Michael: β-ketoesters, β-diketones, β-ketoamides, β-ketoanilides, a me nā mea ʻē aʻe. Hiki i ka hui R' i loko o ka mea hāʻawi Michael ke lilo i hui hana a i ʻole hui dual-cure.

ʻO ka lua o ke ʻano o ka oligomer hoʻomaka ponoʻī e hoʻomākaukau nui ʻia ma ka hoʻopili ʻana i nā photoinitiators e loaʻa ana i ka hydroxyl (e like me benzoin, 1173, 184, 2959) me nā oligomers e loaʻa ana nā hui isocyanate, no laila e hoʻopili ana i ka photoinitiator ma luna o ka oligomer e hana i kahi photoinitiator macromolecular me kahi hui hoʻomaka i kūkulu ʻia.

Nā pōmaikaʻi o nā oligomers photoinitiator i hoʻopili ʻia:

1. Ua kokoke ka helu o ka photocuring me ko nā oligomers maʻamau i hui pū ʻia me nā photoinitiators molekole liʻiliʻi.
2. Hoʻohālikelike maikaʻi me ka ʻōnaehana.
3. Hoʻemi nui i ka hiki ke neʻe o ka photoinitiator.
4. Hoʻēmi i ka hana ʻana o nā huahana photodecomposition ʻino mai ka photoinitiator (e like me benzaldehyde).
5. ʻAʻohe mea ʻawahia a ʻino ʻole ka photoinitiator, e kūpono ai no ka hoʻohana ʻana i nā uhi a me nā ʻīnika no ka hoʻopili ʻana i ka meaʻai.

Hōʻike ka ʻikepili e hōʻemi nui ana nā huahana hopena grafting o nā photoinitiators i ka neʻe ʻana a me ka hiki ke hoʻoheheʻe ʻia o nā ʻāpana initiator, a ua emi nui ʻia ka nui o ka benzaldehyde i hana ʻia i loko o ka ʻili i hoʻōla ʻia. No laila, ʻo ka grafting photoinitiators ma luna o nā oligomers e hana maoli i kahi papa o nā photoinitiators macromolecular ʻaʻohe ʻawaʻawa a ʻinoʻino. Hiki ke hoʻohana ʻia i loko o nā uhi a me nā ʻīnika no ka ʻai a me ka hoʻopili lāʻau lapaʻau. I ka makahiki 2006, ua hoʻolaha ka US Food and Drug Administration (FDA) e hiki ke hoʻohana ʻia nā uhi UV a me nā ʻīnika i hana ʻia me ka hoʻohana ʻana i nā photoinitiators macromolecular i ka paʻi ʻana i nā meaʻai a me nā hoʻopili lāʻau lapaʻau, e hoʻololi loa ana i ka hana ma mua kahi i hiki ʻole ai ke hoʻohana ʻia nā ʻīnika UV a me nā uhi no ka meaʻai a me ka hoʻopili lāʻau lapaʻau, a wehe i kahi kahua hou no nā noi ʻīnika UV a me ka uhi.

3.Nā Oligomers Viscosity Haʻahaʻa

I ka hopena o ke kenekulia 20, ua puka mai kahi ʻenehana hou no nā mea hiki ke hoʻōla ʻia e ka photocurable - ka paʻi ʻīnika UV. ʻO ka paʻi ʻīnika kahi ʻano paʻi ʻole-pili ʻaʻole pono nā papa paʻi. Hoʻokumu ia i nā kiʻi ma ka hoʻolei ʻana i nā kulu ʻīnika ma luna o kahi substrate. Ma ka hoʻoponopono ʻana i nā kiʻi a me nā kikokikona ma o kahi kamepiula a me ka hoʻomalu ʻana i ke poʻo paʻi e hoʻolei i nā kulu ʻīnika me ka pololei, he hana kiʻi kikohoʻe piha ia. ʻO ia kekahi o nā ʻano kiʻi kiʻi kikohoʻe e ulu wikiwiki nei, e hāʻawi ana i nā pono o ka paʻi ʻana ma ke koi, ka wikiwiki kiʻekiʻe, ke kūlana kiʻekiʻe, a me nā kala ʻōlinolino.

ʻO ka mea hoʻopau nui no ka paʻi ʻana i ka inkjet UV ʻo ia ka ʻīnika inkjet UV, ʻo ia hoʻi ka ʻīnika e loaʻa ka viscosity haʻahaʻa, ka wikiwiki hoʻōla kiʻekiʻe, ke kūpaʻa pigment maikaʻi, a ʻaʻohe sedimentation.