Taw qhia
Antioxidants (los yog kub stabilizers) yog additives siv los inhibit los yog ncua lub degradation ntawm polymers vim oxygen los yog ozone nyob rau hauv cov huab cua. Lawv yog cov feem ntau siv additives nyob rau hauv cov ntaub ntawv polymer. Cov txheej yuav raug thermal oxidation degradation tom qab ci ntawm qhov kub thiab txias los yog raug tshav ntuj. Phenomena xws li kev laus thiab yellowing yuav cuam tshuam rau cov tsos thiab kev ua tau zoo ntawm cov khoom. Txhawm rau tiv thaiv lossis txo qhov tshwm sim ntawm cov qauv no, cov tshuaj antioxidants feem ntau yog ntxiv.
Thermal oxidation degradation ntawm polymers yog tshwm sim los ntawm cov saw-hom dawb radical cov tshuaj tiv thaiv pib los ntawm cov dawb radicals generated los ntawm hydroperoxides thaum rhuab. Thermal oxidation degradation ntawm polymers tuaj yeem cuam tshuam los ntawm cov dawb radical capture thiab hydroperoxide decomposition, raws li qhia hauv daim duab hauv qab no. Ntawm lawv, antioxidants tuaj yeem cuam tshuam cov oxidation saum toj no thiab yog li siv dav.
Hom tshuaj antioxidants
Antioxidantstuaj yeem muab faib ua peb pawg raws li lawv txoj haujlwm (piv txwv li, lawv cov kev cuam tshuam hauv cov txheej txheem oxidation auto-oxidation):
saw terminating antioxidants: lawv tsuas yog ntes los yog tshem tawm dawb radicals generated los ntawm polymer auto-oxidation;
hydroperoxide decomposing antioxidants: lawv tsuas yog txhawb cov non-radical decomposition ntawm hydroperoxides hauv polymers;
hlau ion passivating antioxidants: lawv tuaj yeem tsim cov chelates ruaj khov nrog cov hlau tsis zoo ions, yog li passivating cov nyhuv catalytic ntawm cov hlau ions ntawm nws pib-oxidation txheej txheem ntawm polymers.
Ntawm peb hom antioxidants, saw-terminating antioxidants hu ua thawj antioxidants, feem ntau yog hindered phenols thiab theem nrab aromatic amines; lwm ob hom yog hu ua auxiliary antioxidants, nrog rau phosphites thiab dithiocarbamate hlau ntsev. Txhawm rau kom tau txais cov txheej txheem ruaj khov uas ua tau raws li daim ntawv thov, kev sib xyaw ntawm ntau yam antioxidants feem ntau yog xaiv.
Kev siv cov tshuaj antioxidants hauv cov txheej txheem
1. Siv nyob rau hauv alkyd, polyester, unsaturated polyester
Nyob rau hauv cov roj-muaj cov khoom ntawm alkyd, muaj ob daim ntawv cog lus rau txawv degrees. Ib daim ntawv cog lus ob zaug, ntau daim ntawv cog lus ob npaug, thiab cov nyiaj sib txuas sib txuas tau yooj yim oxidized los tsim peroxides ntawm qhov kub thiab txias, ua rau cov xim tsaus dua, thaum cov tshuaj antioxidants tuaj yeem decompose hydroperoxides kom pom cov xim.
2. Siv nyob rau hauv lub synthesis ntawm PU curing neeg sawv cev
PU curing agent feem ntau yog hais txog cov prepolymer ntawm trimethylolpropane (TMP) thiab toluene diisocyanate (TDI). Thaum cov resin raug tshav kub thiab lub teeb thaum lub sij hawm synthesis, cov urethane decomposes rau hauv amines thiab olefins thiab lov cov saw. Yog hais tias amine yog aromatic, nws yog oxidized los ua quinone chromophore.
3. Daim ntawv thov nyob rau hauv thermosetting hmoov txheej
Ib qho kev sib xyaw antioxidant ntawm kev ua haujlwm siab phosphite thiab phenolic antioxidants, haum rau kev tiv thaiv cov hmoov txheej los ntawm thermal oxidative degradation thaum ua, kho, overheating thiab lwm yam txheej txheem. Cov ntawv thov suav nrog polyester epoxy, thaiv isocyanate TGIC, TGIC hloov pauv, linear epoxy compounds thiab thermosetting acrylic resins.
Nanjing Reborn New Materials muab ntau homantioxidantsrau yas, txheej, roj hmab kev lag luam.
Nrog rau kev tsim kho tshiab thiab kev vam meej ntawm kev lag luam coatings, qhov tseem ceeb ntawm cov tshuaj antioxidants rau cov txheej txheem yuav ua kom pom tseeb dua, thiab qhov chaw rau kev loj hlob yuav dav dua. Nyob rau hauv lub neej yav tom ntej, antioxidants yuav tsim nyob rau hauv cov kev taw qhia ntawm siab txheeb ze molecular loj, multifunctionality, high efficiency, newness, compositeness, teb thiab ntsuab ib puag ncig tiv thaiv. Qhov no xav kom cov kws kho mob ua qhov kev tshawb fawb tob los ntawm ob qho tib si cov txheej txheem thiab daim ntawv thov kom txuas ntxiv txhim kho lawv, ua qhov kev tshawb fawb tob txog cov yam ntxwv ntawm cov tshuaj tua kab mob antioxidants, thiab txuas ntxiv txhim kho cov tshuaj antioxidants tshiab thiab muaj txiaj ntsig raws li qhov no, uas yuav muaj kev cuam tshuam loj heev rau kev ua thiab kev siv cov txheej txheem kev lag luam. Antioxidants rau coatings yuav ua rau kom lawv lub peev xwm loj thiab ua rau muaj txiaj ntsig zoo ntawm kev lag luam thiab thev naus laus zis.
Lub sij hawm xa tuaj: Plaub Hlis-30-2025