Hnub ci yog ib qho ntawm cov ua rau degradation hauv plastics, coatings, adhesives, fibers thiab lwm yam polymer-raws li cov ntaub ntawv. Ntev ntev raug rau ultraviolet (UV) hluav taws xob tuaj yeem ua rauxim fading, yellowing, poob ntawm gloss, nto tawg, chalking, embrittlement thiab deterioration ntawm txhua yam khoom.Txhawm rau kev txhim kho sab nraum zoov, cov qauv siv feem ntau sivUV absorbersthiablub teeb stabilizers. Txawm li cas los xij, cov ntsiab lus no qee zaum siv sib hloov, uas tuaj yeem ua rau tsis meej pem thaum xaiv cov khoom ntxiv.
Yog li, qhov txawv ntawm aUV absorber thiab lub teeb stabilizer? Lawv puas yog tib yam? Thiab thaum twg yuav tsum manufacturers siv aUV absorber, a HALS lub teeb stabilizer, los yog ob qho tib si ua ke?
Qhov tseem ceeb yog tias lawv tiv thaiv cov polymers los ntawm cov txheej txheem sib txawv.
Dab tsi yog UV Absorber?
A UV absorber (UVA)yog ib qho additive tsim los nqus cov teeb meem ultraviolet hluav taws xob ua ntej lub zog yuav ua rau muaj kev puas tsuaj loj rau lub polymer.Thaum ib lub polymer raug tshav ntuj, UV hluav taws xob tuaj yeem pib photochemical cov tshuaj tiv thaiv hauv polymer matrix. AUV absorbernyiam absorbs ib feem ntawm qhov siab - zog UV hluav taws xob thiab dissipates lub zog absorbed raws li qis - theem cua sov. Qhov no txo qhov kev puas tsuaj UV hluav taws xob mus txog cov saw hlau polymer.
Feem ntauUV absorbercov tsev neeg suav nrogbenzotriazoles, benzophenones thiab triazines. Benzotriazole UV absorbers, xws li UV-328, UV-329 thiab UV-326, yog dav siv nyob rau hauv dav dav UV tiv thaiv thiab zoo compatibility yuav tsum tau.
Qhov no ua rau ibUV absorber rau plasticstshwj xeeb tshaj yog muaj txiaj ntsig thaum qhov kev txhawj xeeb tseem ceeb yog tiv thaiv cov khoom siv los ntawm kev cuam tshuam thawj zaug ntawm UV hluav taws xob.
Lub teeb Stabilizer yog dab tsi?
Lub teeb stabilizeryog lub ntsiab lus dav dav rau cov khoom siv ntxiv uas txhim kho qhov tsis kam ntawm cov polymers thiab txheej txheej rau lub teeb -induced degradation. Ib qho tseem ceeb tshaj plaws ntawm lub teeb stabilizers yogHALS, los yogHindered Amine Lub Teeb StabilizersTsis zoo li UV absorber,HALS tsis ua haujlwm feem ntau los ntawm kev nqus UV hluav taws xob. Hloov chaw, HALS pab cuam tshuam lub voj voog photooxidative degradation los ntawm kev cuam tshuam nrog dawb -radical intermediates generated thaum lub sij hawm polymer degradation. HALS tuaj yeem rov tsim dua thaum lub sijhawm ua haujlwm ruaj khov, uas ua rau nws ua haujlwm siab thiab ua haujlwm ntev -.
Qhov kev sib txawv no yog qhov tseem ceeb thaum sib piv aUV absorber vs HALS.
UV absorber ua ntau dua li iblim, txo qhov teeb meem UV hluav taws xob nkag mus rau polymer. HALS ua ntau dua li ibtshuaj tiv thaiv system, suppressing cov dawb - cov tshuaj tiv thaiv radical uas tshwm sim thaum photooxidation.
UV Absorber vs. Lub Teeb Stabilizer: Qhov Sib Txawv Tseem Ceeb
Txoj kev yooj yim tshaj plaws kom nkag siab qhov sib txawv yog saib lawv cov txheej txheem.
|
Feature |
UV Absorber |
HALS Lub Teeb Stabilizer |
|
Lub luag haujlwm tseem ceeb |
Absorbs UV hluav taws xob |
Tshem tawm dawb -radical degradation |
|
UV nqus |
Yog lawm |
Tsis yog, tsis yog nws lub luag haujlwm tseem ceeb |
|
Main tiv thaiv mechanism |
Converts absorbed UV zog rau hauv tshav kub |
Radical scavenging / stabilization voj voog |
|
Cov txiaj ntsig zoo |
Tiv thaiv polymer thiab zoo li |
Tiv thaiv polymer nto thiab bulk |
|
Tshwj xeeb yog pab tau rau |
Txheej, yas, cov ntaub ntawv pob tshab |
Polyolefins, zaj duab xis, fibers, sab nraum zoov yas |
|
Puas tuaj yeem ua ke? |
Yog lawm |
Yog lawm |
Yog li ntawd, nug seb aUV absorber los yog lub teeb stabilizeryog "zoo dua" tsis ib txwm muaj ib lo lus teb. Lawv tau tsim los hais txog ntau theem ntawm cov txheej txheem photodegradation.
UV Absorber vs. HALS rau Plastics
Rau manufacturers nrhiav rau aUV stabilizer rau plastics, qhov kev xaiv nyob ntawm ntau yam ntawm cov polymer, cov khoom geometry, pigmentation, sab nraum zoov raug thiab xav tau kev pab lub neej.
UV absorberstuaj yeem pab tau tshwj xeeb thaum tiv thaiv UV hluav taws xob thiab kev tuav pov hwm zoo yog qhov tseem ceeb. Lawv tuaj yeem pab txo cov xim tsis zoo thiab tiv thaiv cov polymer matrix los ntawm UV raug.
HALS, ntawm qhov tod tes, muaj txiaj ntsig zoo hauv ntau daim ntawv thov polyolefin thiab tshwj xeeb tshaj yog muaj txiaj ntsig zoo hauv cov khoom lag luam nrog cov cheeb tsam loj, suav nrog cov yeeb yaj kiab thiab fibers. Kev lag luam cov ntaub ntawv qhia txog HALS ua tau zoo heev rau polyolefin lub teeb stabilization.
Vim li no, cov ntawv thov xws li cov khoom siv sab nraum zoov polypropylene, polyethylene zaj duab xis thiab cov yas ua liaj ua teb tuaj yeem siv HALS ua ib qho tseem ceeb ntawm cov pob khoom ruaj khov.
Koj puas xav tau ob qho tib si UV Absorber thiab HALS?
Hauv ntau daim ntawv thov xav tau, cov lus teb yogob leeg.
A UV absorber + HALSsystem tuaj yeem muab kev tiv thaiv ntxiv vim tias ob qho khoom siv ntxiv hais txog qhov sib txawv ntawm polymer photodegradation. UV absorber txo qhov teeb meem UV lub zog nkag mus rau hauv cov khoom, thaum HALS pab tswj cov dawb - cov tshuaj tiv thaiv radical lub luag haujlwm rau photooxidative degradation.
Txoj hauv kev no twb tau siv dav hauv kev lag luam ruaj khov. BASF, piv txwv li, piav qhia txog UVA / HALS kev sib txuas ua ke raws li cov thev naus laus zis ntxiv thiab muab cov khoom sib xyaw tsim los txhim kho xim thiab gloss tuav thiab ntev - lub sij hawm durability.
Rau sab nraum zoov coatings, automotive plastics, architectural coatings, films thiab lwm yam kev thov, ib tug ua ke ntawmUV absorber thiab HALS lub teeb stabilizeryog li ntawd tuaj yeem muab kev tiv thaiv ntau dua li kev cia siab rau ib leeg ntxiv.
UV Absorber los yog HALS: Koj Yuav Tsum Xaiv Ib Yam Dab Tsi?
Tsis muaj universalQhov zoo tshaj plaws UV stabilizer rau cov yas. Qhov tseeb additive nyob ntawm daim ntawv thov.
Yog qhov tseem ceeb yuav tsum taulim UV hluav taws xob thiab tiv thaiv xim, pob tshab lossis zoo li, haumUV absorbertej zaum yuav yog qhov pib.
Yog tias cov khoom muaj kev cuam tshuam rau photooxidation thiab yuav tsum tau ntev - tiv thaiv qhov tawg, chalking thiab mechanical deterioration,HALStuaj yeem ua lub luag haujlwm tseem ceeb dua.
Rau kev thov sab nraum zoov, cov qauv siv tau sivUV absorber thiab HALS ua ke. Qhov kawg formulation kuj muaj xws li antioxidants thiab lwm yam stabilizers vim hais tias thermal ua thiab oxidation yuav pab tau rau polymer degradation thiab. Kev lag luam stabilization systems feem ntau tsim nyob ib ncig ntawm ob peb lub tswv yim ntxiv es tsis yog ib qho ntxiv.
Xaiv txoj cai UV Absorber rau koj daim ntawv thov
Tsis yog txhua tus UV absorbers muaj qhov ua tau zoo ib yam.Benzotriazole UV absorbersfeem ntau xaiv rau kev tiv thaiv UV dav, thaum cov tsev neeg tshuaj sib txawv yuav nyiam nyob ntawm cov khoom siv polymer thiab kev ua haujlwm.
Piv txwv li, UV-326, UV-328thiabUV-329yog benzotriazole- hom UV absorbers nrog cov qauv molecular sib txawv thiab daim ntawv thov profiles. Thaum xaiv ibUV absorber rau plastics, formulators yuav tsum xav txog polymer compatibility, UV absorption ntau yam, volatility, migration resistance, processing temperature, transparency and long-term weathering requirements.
Tib txoj cai siv rau HALS. Cov qib HALS sib txawv yog tsim los rau cov txheej txheem polymer sib txawv, kev ua haujlwm thiab xaus - siv daim ntawv thov.
Yog li ntawd, tsuas yog xaiv cov additive nrog lub siab tshaj plaws UV nqus tsis tas yuav ua rau qhov kawg tshwm sim zoo tshaj plaws.
UV Absorbers thiab Lub Teeb Stabilizers hauv Txheej Txheej
Qhov sib txawv ntawm cov thev naus laus zis no kuj tseem ceeb hauvtxheej txheej.
UV absorbers tuaj yeem lim cov teeb meem UV hluav taws xob thiab pab tiv thaiv ob qho tib si txheej thiab hauv qab substrate. HALS tuaj yeem txwv tsis pub dawb- radical degradation thiab pab tswj cov khoom nto xws li gloss thaum txo qhov tawg thiab chalking.
Qhov no yog vim li casUV absorber thiab HALS sib tov rau txheejyog dav siv nyob rau hauv automotive, industrial, architectural thiab lwm yam sab nrauv daim ntaub ntawv.
Rau cov tsho ntshiab thiab cov txheej pob tshab, cov khoom siv kho qhov muag ntawm UV absorber yog qhov tseem ceeb tshwj xeeb. Rau pigmented coatings, compatibility nrog pigments, resin systems thiab lwm yam additives yuav tsum tau txiav txim siab.
Qhov txawv ntawm aUV absorber thiab lub teeb stabilizerNws tuaj yeem raug sau tseg yooj yim: ib qho UV absorber feem ntauabsorbs teeb meem UV hluav taws xob, thaum lub teeb HALS stabilizer feem ntautswj cov dawb- cov tshuaj tiv thaiv radical cuam tshuam nrog photooxidative degradation.
Lawv yog li ntawd tsis yog tsuas yog interchangeable khoom.
Rau kev tiv thaiv ncaj qha UV, tsim nyogUV absorbertuaj yeem muab qhov kev ua haujlwm xav tau. Rau kev thov sab nraum zoov plastics thiab txheej,HALStuaj yeem muab cov txiaj ntsig zoo ntev - lub sijhawm ruaj khov. Hauv ntau qhov kev ua tau zoo - qauv, txawm li cas los xij, txoj hauv kev zoo tshaj plaws yog los ua ke aUV absorber thiab HALSkom lawv tiv thaiv cov polymer los ntawm cov txheej txheem ntxiv.
Txoj caiUV stabilizer rau plasticsThaum kawg nyob ntawm cov polymer, kev ua haujlwm, cov khoom thickness, sab nraum zoov raug, xim yuav tsum tau thiab kev cia siab rau lub neej. Laboratory weathering thiab formulation testing tseem ceeb heev rau kev txiav txim siab qhov tsim nyog additive hom thiab ntau npaum li cas.
