Vim li cas Polythiol 504 Dominates Siab -Index Optical Resin Formulations

Ib tug formulator phau ntawv qhia rau refractive index, Abbe tooj, NCO/SH ratio, thiab kho kinetics rau siab -index polythiourethane lo ntsiab muag

Polythiol 504 muab qhov ntsuas qhov cuam tshuam ntawm 1.6300–1.6350 nrog tus lej Abbe ntawm 34–36.Tau txais qhov zoo tshaj plaws ntawm nws yuav tsum muaj ntau tshaj qhov tsuas yog xaiv txoj cai monomer - NCO / SH piv, cov ntsiab lus dej, thiab kev kho lub voj voog tag nrho txiav txim siab seb lub lens kawg yog qhov tseeb los yog daj ntseg, nyias lossis tuab, ruaj lossis nkig.

Phau ntawv qhia no suav nrog:Cov qauv molecular, cov ntsiab lus tseem ceeb, qhov ntsuas qhov ntsuas tsis zoo vs Abbe kev lag luam-tawm, NCO/SH cov qauv ntau, kho kinetics, thiab cov ntsuas tsis zoo los xyuas txhua pawg.

Taw qhia

Tus neeg mob taug kev mus rau hauv tus kws kho qhov muag nrog rau -8.00 tshuaj. Standard CR-39 lo ntsiab muag nyob rau hauv cov tshuaj yuav yog roughly 8 mm tuab ntawm ntug. Lub lens 1.60-index txiav qhov ntawd mus txog 5 mm. Qhov txawv tseem ceeb rau tus neeg mob. Nws kuj tseem ceeb rau tus tsim qauv xaiv lub monomer

Refractive index yog tus naj npawb xov tooj rau siab -index lo ntsiab muag. Tab sis tsis yog ib leeg xwb.Abbe tooj, uas ntsuas chromatic dispersion, txiav txim siab seb tus neeg mob puas pom cov xim fringing ntawm cov npoo ntawm lub lens. Cov ntsiab lus dej hauv lub monomer txiav txim seb lub lens kho puas muaj npuas. NCO/SH molar ratio txiav txim seb cov resin kho kom zoo los yog nyob twj ywm mos.

Polythiol 504 (CAS 131538-00-6), tseem hu ua 4-(mercaptomethyl)-3,6-dithia-1,8-octanedithiol, zaum ntawm qhov chaw ntawm qhov ntsuas ntsuas no. Cov kab lus no suav nrog chemistry, cov ntaub ntawv, thiab cov qauv tsis muaj teeb meem thaum siv nws hauv polythiourethane lens systems.

Dab tsi ua rau Polythiol 504 txawv

Tsib sulfur atoms nyob rau hauv ib tug compact C7 ncej

Lub molecule yog tsim los ntawm propane qaum. Peb thiol (-SH) pawg dai tawm nws - ib qho ncaj qha rau ntawm thawj cov pa roj carbon, ob qho kev sib txuas ntawm ethylthio linkages uas txhua tus nqa lub davhlau ya nyob twg thiol.Tsib sulfur atoms zaum nyob rau hauv ib tug compact C7 ncej.

Qhov sulfur density yog dab tsi tsav lub refractive index. Lub teeb qeeb qeeb thaum nws dhau los ntawm qhov nruab nrab nrog ntau polarizable electrons. Sulfur muaj cov khoom siv hluav taws xob ntau dua li cov pa oxygen lossis carbon, thiab sulfur-sulfur bonds yog polarizable ntau dua li carbon-carbon bonds. Ntim tsib sulfur atoms rau hauv ib lub molecule nrog ib qho hnyav molecular xwb260.53 g / mol, thiab lub refractive index nce mus rau1.6300-1.6350 ntawm 20 degree.

Trifunctional architecture tsim crosslinked tes hauj lwm

Peb pawg thiol ua rau nws tsis muaj nuj nqis. Thaum kho, txhua thiol reacts nrog ib pawg isocyanate (-NCO) los tsim ib daim ntawv cog lus thiourethane (-NH-CO-S-).Peb thiols ib molecule txhais tau tias peb cov ntsiab lus txuas, uas tsim kom muaj peb - qhov sib txuas sib txuas. Ntau dua crosslink ceev muab cov kho resin zoo dua txhua yam lub zog thiab thermal stability tshaj li qhov ua tau zoo ntawm thiol tuaj yeem ua tiav.

Saj zawg zog spacers txhim kho kev cuam tshuam

Cov kev sib txuas ntawm ethylthio ntawm cov pab pawg thiol qhia kev hloov pauv mus rau hauv cov pob txha. Ib qho yooj yim nruj polythiourethane network yuav nkig.Qhov luv -(CH2)2-S- spacers tso cai rau qee lub zog nqustsis muaj kev cuam tshuam qhov siab refractive index uas cov sulfur atoms muab.

Cov ntsiab lus tseem ceeb rau Formulators

Siv cov ntaub ntawv ntawm ib nrais muag

Thaum xaiv Polythiol 504 rau kev tsim lub lens, cov no yog cov lej uas tseem ceeb:

Vim li cas dej cov ntsiab lus yog qhov txawv txav

Cov ntsiab lus dej tsawg dua lossis sib npaug li 500 ppm yog qhov tseem ceeb.Isocyanates hnov ​​​​mob nrog dej los tsim cov pa roj carbon dioxide, uas tsim cov npuas hauv lub lens kho. Ua kom dej qis dua 500 ppm tiv thaiv cov tshuaj tiv thaiv sab nraud los ntawm kev pom hauv cov khoom kawg. Lub refractive index ntawm 1.6300-1.6350 siv rau raw monomer. Thaum reacted nrog ib tug diisocyanate, lub kho polythiourethane network yuav muaj ib tug refractive index txiav txim los ntawm tag nrho cov muab, feem ntau nyob rau hauv lub1.59–1.67 dr hab.

Lub Refractive Index vs Abbe Number Trade-tawm

Vim li cas qhov Performance index siab dua feem ntau txhais tau tias ntau xim fringing

Muaj ib txoj cai dav dav hauv cov khoom siv kho qhov muag: raws li qhov ntsuas qhov taw qhia nce, Abbe tus lej txo.Kev ntsuas siab dua feem ntau txhais tau tias muaj ntau dua dispersion, uas txhais tau tias ntau xim fringing.

Polythiol 504 nyuaj rau txoj cai vim nws cov qauv molecular. Cov sulfur atoms tsa lub refractive index, tab sis cov ethylthio linkages qhia electron delocalization uas moderates dispersion. Hauv 1.60-index lens system, formulations siv Polythiol 504 ua tiav ib qhoAbbe tus naj npawb ntawm 34–36.

Yuav ua li cas nws piv rau lwm cov ntaub ntawv lens

Rau cov ntsiab lus, tus qauv 1.50-index CR-39 lens muaj tus lej Abbe txog58. Lub lens 1.67-index MR-7 muaj tus lej Abbe txog32. Polythiol 504 nyob rau hauv ib tug 1.60 system zaum nyob rau hauv nruab nrab - index siab dua li CR-39 nrog rau chromatic kev ua tau zoo.

Vim li cas Abbe tus lej yog kev tsim- tshwj xeeb

Abbe tooj yog cov cuab yeej ntawm cov khoom kho, tsis yog cov monomer nyoos.Nws nyob ntawm tag nrho cov monomer sib xyaw thiab kev xaiv isocyanate. Qhov no yog vim li cas cov neeg muab khoom lag luam uas tshaj tawm tus naj npawb ntawm Abbe nyob ib leeg rau polythiol yog kev dag ntxias. Txoj hauv kev kom raug yog nug rau Abbe cov ntaub ntawv ntawm ib qho kev tsim tshwj xeeb.

NCO/SH Molar Ratio: The Formulation Variable That Matters Feem ntau

Ua haujlwm ntau: 0.8-1.2

NCO/SH molar ratio - isocyanate pawg rau thiol pawg - txiav txim siab seb lub network puas kho tau. Rau polythiourethane lens tshuab, qhov kev ua haujlwm raug ua haujlwm yog0.8 rau 1.2. Ntawm 1.0, stoichiometric tshuav nyiaj li cas, txhua NCO pom ib qho SH thiab vice versa. Hauv kev xyaum, me ntsis ntau tshaj ntawm ib qho khoom feem ntau yog siv los them rau cov kev cuam tshuam sab lossis kho cov khoom kawg.

Dab tsi tshwm sim sab nraum qhov ntau

Hauv qab 0.8, pawg thiol uas tsis muaj kev cuam tshuam tseem nyob hauv cov resin, uas tuaj yeem ua rau muaj ntxhiab tsw thiab txo qhov crosslink ceev.Saum toj no 1.2, unreacted isocyanate tuaj yeem hnov ​​​​mob nrog dej raws sijhawm, ua rau yellowing los yog haze.

Ib qho piv txwv luam tawm qauv

Ib qho piv txwv tsim los ntawm Suav patent qhia txog kev siv tswv yim. Cov muaj pes tsawg leeg suav nrog40g uaPolythiol 504, 15 g ntawm isophthalic dimethyl isocyanate, 35 g ntawm isophorone diisocyanate, thiab 7.5 g ntawm pentaerythritol tetraacrylate li co-monomer. Cov khoom siv kho qhov muag tau ua tiav qhov refractive index ntawm1.662–1.693nyob ntawm qhov kev sib txawv ntawm cov qauv, nrog rau pom lub teeb transmittance saum toj no90%.

Nco ntsoov siv ob qho sib txawv isocyanates. Isophthalic dimethyl isocyanate txhawb rigidity thiab refractive index. Isophorone diisocyanate, ua aliphatic, txhawb huab cua tiv thaiv thiab cuam tshuam lub zog.Kev sib xyaw isocyanates yog ib txoj hauv kev los sib npaug ntau yam khoom hauv ib qho cob.

Kho Kinetics thiab Catalyst xaiv

Ua ntej - xaj kinetics nrog XDI

Kev tshawb fawb luam tawm ntawm kev kho kinetics ntawm Polythiol 504 nrog m-xylylene diisocyanate (XDI) siv triethylamine ua catalyst thiab ntsuas cov tshuaj tiv thaiv los ntawm FTIR ntawm 75℃-105℃.Cov tshuaj tiv thaiv ua ntej - xaj kineticsnrog rau isocyanate concentration.Lub zog ua kom muaj zog yog 100.23 kJ / mol.Cov ntsiab lus catalyst siab dua shortens gel lub sij hawm. Qhov tsis zoo entropy ntawm kev ua kom pom tau tias muaj kev hloov pauv tsis zoo thaum lub sijhawm tus nqi - txiav txim siab kauj ruam.

Cov kev cuam tshuam rau kev tsim khoom

Nyob rau hauv lub tswv yim, qhov no txhais tau tias peb yam. Ua ntej, tus nqi kho yog kwv yees tau thiab tuaj yeem ua qauv, uas yuav pab nrog kev npaj lub sij hawm voj voog. Thib ob,nce catalyst concentration muaj cov nyhuv linear ntawm lub sij hawm gel, yog li catalyst loading yog ib qho yooj yim hu rau kho kho ceev. Thib peb, lub75℃-105℃ntau yamyog qhov twg cov tshuaj tiv thaiv tshwm sim ntawm kev tsim khoom- nrawm nrawm. Hauv qab 75 degree, kev kho yuav ua rau qeeb qeeb yam tsis muaj kev thauj khoom catalyst ntau dua.

Daim ntawv thov Beyond Eyeglass Lenses

Automotive glazing

Siab- Performance index polythiourethane tuaj yeem muab pov rau hauv lub teeb yuag, cuam tshuam -cov qhov rai tiv thaiv. Lub refractive index yog qhov tseem ceeb ntawm no dua li qhov cuam tshuam lub zog thiab qhov muag pom tseeb, tab sis tib lub monomer ua haujlwm rau ob lub hom phiaj.

UV-kho coatings thiab adhesives

Cov pab pawg thiol koom nrogthiol-ene cov tshuaj tiv thaiv nyob rau hauv UV teeb, tsim cov sib txuas sib txuas ntawm chav tsev kub. Qhov no ua rau cov coatings ntawm cov cua sov-sensitive substrates qhov twg thermal curing tsis ua tau.

Epoxy curing agents

Thiol-epoxy systems kho sai dua ntawm qhov kub qis dua amine-epoxy systems.Polythiol 504 muab peb qhov chaw reactive ib molecule, ua kom muaj kev sib txuas siab ntawm chav tsev kub.

Hnyav hlau ntes

Thiol pawg chelate hnyav hlau ions. Polythiol 504 yog siv rau hauv kev kho dej khib nyiab thiab kev siv hlau rov qab.

Zoo Parameters thiab Batch Consistency

Vim li cas batch sib xws tseem ceeb tshaj qhov siab tshaj purity

Rau cov ntawv thov kho qhov muag, batch- mus rau -batch sib xws tseem ceeb npaum li qhov purity kiag li.Ib qho kev hloov pauv hauv thiol cov ntsiab lus los ntawm 37% mus rau 36% hloov pauv stoichiometric tshuav nyiaj li cas thiab tuaj yeem cuam tshuam NCO / SH piv rau hauv cov qauv uas tau ua kom zoo rau ib pawg.

Plaub COA qhov ntsuas kom paub tseeb ntawm txhua pawg

Thiol cov ntsiab lus los ntawm titration- txiav txim siab qhov hnyav sib npaug rau kev suav stoichiometric.

Refractive index ntawm 20 degree- ntsuas ntawm cov monomer raw.

Cov ntsiab lus dej los ntawm Karl Fischer titration- tiv thaiv CO₂ npuas thaum kho.

APHA xim- qhia tias muaj cov khoom oxidation los yog impurities uas tuaj yeem cuam tshuam rau lub lens xim kawg.

Alfa Chemical khoom siv Polythiol 504 los ntawm pebZhengzhou, Suavqhov chaw nrog batch- tshwj xeeb COA qhia txog qhov ntsuas qhov tseem ceeb rau tag nrho cov kev ntsuas no. Rau kev txhawb nqa los yog cov qauv COA, hu rau peb los ntawm pebTiv tauj pebnplooj. Rau qhov cuam tshuam optical monomers thiab polythiols, saib peborganic tsev blocksntau.

Cov ntsiab lus

Cov formulators yuav tsum nco ntsoov li cas

Polythiol 504 xa ibrefractive index ntawm 1.6300–1.6350nyob rau hauv lub raw monomer thiab ibAbbe tus naj npawb ntawm 34–36nyob rau hauv 1.60-index lens systems. Lub trifunctional qauv tsim crosslinked polythiourethane tes hauj lwm nrog zoo txhua yam khoom. CovNCO/SH ratio 0.8–1.2rau kev kho kom tiav.Cov ntsiab lus dej hauv qab 500 ppmtiv thaiv npuas tsim. Kev kho kinetics yog thawj zaug - xaj, nrog lub zog ua haujlwm ntawm 100.23 kJ / mol.

Cov ntaub ntawv hauv kab lus no yog los ntawm cov ntaub ntawv luam tawm thiab cov khoom siv tshwj xeeb. Cov neeg tsim qauv yuav tsum txheeb xyuas cov batch- cov txiaj ntsig tshwj xeeb tawm tsam COA thiab ua lawv tus kheej qhov kev ntsuas tsim nyog raws li cov khoom tsim tau tiag tiag.

Rau Polythiol 504 specifications, COA, los yog ib qho kev tshawb fawb qauv, saib covnplooj ntawv khoomlos yogtiv tauj peb pab neeg technical.