Compound Mechanism thiab kev ua qauv tsim qauv ntawm lub ntsiab thiab cov tshuaj tiv thaiv antioxidants tawm tsam cov pa oxygen laus
Cov anti-thermal oxygen ua tiav yog tsuas yog ua tiav los ntawm kev ntxiv cov antioxidants thiab ob leeg tau muab faib ua ob hom ua ke, thiab ob qho kev tawm tsam cov pa thermal zoo dua.
- Mechanism ntawm kev ua ntawm cov thawj antioxidants
Cov tshuaj tiv thaiv tseem ceeb tuaj yeem hnov mob dawb radicals, tshem tawm cov radicals, hloov pauv cov pa dej khov kho, thiab lub hom phiaj ua kom muaj zog, thiab ua tiav lub hom phiaj ntawm kev tiv thaiv cov polymer. Cov hom tshwj xeeb ntawm kev ua yog raws li hauv qab no:
Hydrogen cov neeg pub nyiaj, cov kab ke ntawm cov kab mob siab qub, cov antolic antioxidants muaj-hydrogen antioxidants, yog li ntawd cov pab pawg muaj zog tshaj plaws tsim hluav taws xob ruaj khov los yog cov hydroopoxides.
Dawb radical traps, benzoquinone antioxidants hnov nrog dawb radicals los tsim ruaj khov dawb radicals.
Kev pub hauv hluav taws xob, Tertiary Amine Antioxidants muab cov tshuab hluav taws xob los ua kom muaj qhov tsis zoo rau ions, kev tawm tsam pib-oxidation.
Thawj cov tshuaj tiv thaiv kab mob antioxidants tuaj yeem siv ib leeg, tab sis ua haujlwm zoo dua nrog cov antioxidants zoo dua.
- Mechanism ntawm kev ua ntawm cov antioxidiary
Cov tshuaj antioxidiary muaj peev xwm decomples hydompivers tsim los ntawm theem tseem ceeb uas tseem muaj qee qhov kev ua ub no, yog li lawv tsis rov pib ua ntej oxidation kev tawm tsam.
Tsis tas li ntawd, cov tshuaj antioxidiary tuaj yeem inhibit thiab ncua kev tsim cov dawb radicals thaum lub sij hawm pib cov txheej txheem seem hauv cov polymer. Ntu ua haujlwm antioxidantute xws li phosphite estres thiab organic sulfides yog cov neeg sawv cev nruab nrab.
- Xaiv cov antioxidants
Muaj ntau ntau yam ntawm antioxidants, thiab cov ntsiab lus hauv qab no yuav tsum tau them siab rau thaum xaiv.
(1) Sib xyaws, sib raug zoo yog hais txog kev ua haujlwm fusion ntawm antioxidants thiab cov txiaj ntsig ntawm cov pherols thiab cov phosphite nrog pe yog qhov zoo.
(2) ua kev ua tau zoo, tom qab ntxiv ntawm Antioxidanter thiab lub zog loj heev, tab sis kuj yuav ua rau antioxidant thiab kuj tseem yuav ua rau antioxidant ntau yam nrog melting cov ntsiab lus qis dua 100 ° C.
(3) muaj kuab paug thiab kev huv, amine antioxidants yog ib chav kawm zoo ntawm cov antioxidants siab nrog antioxidant equiciency. Txawm li cas los xij, nws yuav hloov xim thaum ua thiab paug cov khoom, thiab cov tshuaj lom yog ntau, yog li nws feem ntau tsis siv rau cov khoom lag luam polymer uas xav tau kev nyiam huv.
(4) Kev ruaj khov, amine antioxidants yuav hloov cov xim ua rau muaj kev cuam tshuam nrog hydrolyze, cuam tshuam rau cov khoom siv tshuaj ntsuab yooj yim? Tag nrho cov saum toj no yuav cuam tshuam rau kev ua haujlwm antioxidant.
(5) Kev siv hluav taws xob tsis kam thiab kev hloov pauv, muab cov tshuaj tiv thaiv kab mob antioxidant nyob rau hauv cov khoom siv volt, ntau dua cov antioxidant, qhov ntau nyuaj nws yog kev rho tawm. Volatile hais txog qhov tshwm sim uas cov khoom lag luam polymer uas muaj cov tshuaj tiv thaiv kab mob molecidants thiab qhov tsis sib xws ntawm cov tshuaj tua kab mob antioxidants me me.
- Kev xaiv ntawm thawj cov antioxidants
Hinder cov Phenolic thawj antioxidant yog feem ntau siv nyob rau hauv cov polymers vim tias nws tsis paug cov khoom, yog ze rau dawb, tsis muaj tshuaj lom lossis qis toxicity. Qhov kev sib ntxiv ntawm 0.4% ~ 0.45% cuam tshuam amine lub antioxidant muaj qhov yooj yim rau cov khoom lag luam zoo nkauj thiab muaj kuab lom, thiab nws tsis tshua siv rau cov polymers. Qee lub sij hawm nws tsuas tuaj yeem siv tau rau hauv cov khoom tsaus polymer. Lub synergistic ntxiv ntawm cov ntau yam sib txawv ntawm cov thawj cov kab mob antioxidants muaj qhov zoo dua li ib qho ntxiv, xws li cov phenol zoo dua qub, tabkaum ua ke / tabkaum / phenol sib xyaw ua ke.
- Xaiv cov antioxidants
Phosphate muaj cov nyhuv zoo nrog lub antioxidant, thiab muaj qee qhov tsis zoo, yog cov khoom siv hluav taws xob tsis zoo, tab sis tuaj yeem xaiv hom dej tsis zoo-tiv taus hom. Daim ntawv thov ntawm sulphur-muaj cov compound antioxidiary tsis yog qhov tseeb li cov neeg muaj kuab paug, thiab nws muaj cov khoom sib txuas nrog cov nyhuv uas muaj teeb meem
- Synergistic nyhuv ntawm cov thawj thiab antioxidiary
Cov tshuaj tua kab mob antioxidiary yuav tsum tau ntxiv rau hauv kev ua kom muaj kab mob antioxidant kom muaj cov antioxidant ntxiv, thiab nws ntxiv ib qho tsis muaj kev tawm tsam antioxidant. Cov tshuaj ntsuab ntawm cov tshuaj tua kab mob antioxidan yog hindered phenol / thij, phosphite, 1076, thiab lwm yam. Phosphate yog phosphite 168.
Lub Sijhawm Post: NOV-30-2022