Avobenzoneyog ib qho dav-spectrum UVA absorbent, feem ntau yog siv hauv cov khoom siv tshuaj pleev thaiv hnub. Nws tuaj yeem nqus tau UVA band ultraviolet rays zoo, txo qhov kev puas tsuaj ntawm ultraviolet rays rau ntawm daim tawv nqaij, thiab tiv thaiv tshav ntuj, tshav kub, mob qog noj ntshav thiab lwm yam teeb meem.
Ntxiv rau cov khoom siv tshuaj pleev thaiv hnub, Avobenzone kuj tseem siv rau hauv lwm cov tshuaj pleev ib ce, xws li lub ntsej muag cream, tshuaj pleev lub cev, tshuaj pleev plhu, thiab lwm yam, los muab kev tiv thaiv UVA ntxiv. Tsis tas li ntawd, Avobenzone tuaj yeem siv rau hauv kev lag luam xws li dyes, plastics thiab coatings li UVA absorbent.
Nws yuav tsum tau muab sau tseg tias Avobenzone yuav plam nws stability nyob rau hauv tej yam kev mob, xws li lub teeb, oxidation, thiab lwm yam, yog li yuav tsum tau them nyiaj mloog mus rau nws siv thiab cia. Lwm cov tshuaj, xws li lub teeb stabilizers thiab antioxidants, tej zaum yuav muab ntxiv rau qee cov tshuaj pleev thaiv hnub los txhim kho kev ruaj ntseg ntawm Avobenzone. Thaum xaiv thiab siv cov tshuaj pleev thaiv hnub, koj yuav tsum xaiv qhov tsim nyog thiab siv raws li koj cov tawv nqaij zoo nkauj, tshuaj pleev thaiv hnub xav tau, ib puag ncig thiab lwm yam.
Avobenzone (4-aminobenzoic acid - 2 - (4-methoxyphenyl) - 2-oxy-1,3-dimercaptopentane) yog cov organic compound siv los tiv thaiv tshav ntuj. Nws yog dav-spectrum UVA absorbent, muaj peev xwm nqus tau 320-400nm ultraviolet hluav taws xob. Txawm li cas los xij, qhov tshwm sim ntawm Avobenzone tuaj yeem cuam tshuam nws txoj kev ruaj ntseg hauv tshuaj pleev thaiv hnub. Cov nram qab no yog cov tshuaj tiv thaiv ntawm Avobenzone:
1. Photodecomposition: Avobenzone nquag mus photodecomposition nyob rau hauv ultraviolet hluav taws xob, yog li poob nws lub peev xwm nqus. Cov tshuaj tiv thaiv no tau txwv nws txoj kev siv tshuaj pleev thaiv hnub thiab yuav tsum tau siv ua ke nrog lwm cov stabilizers kom nws ruaj khov.
2. Kev sib cuam tshuam nrog lwm cov tebchaw: Avobenzone cuam tshuam nrog qee qhov sib txuas, uas yuav ua rau nws degradation los yog poob ntawm kev nqus. Piv txwv li, nws yuav hnov mob nrog qee cov hlau ions lossis txo cov neeg ua haujlwm.
3. Pigment formation: Qee zaum, Avobenzone tuaj yeem hnov mob nrog oxygen los ua cov xim sib xyaw, uas tuaj yeem txo nws qhov nqus tau.
Txhawm rau kom muaj kev ruaj ntseg ntawm Avobenzone nyob rau hauv cov tshuaj pleev thaiv hnub, nws yog ib qho tsim nyog yuav tau siv ntau yam kev ntsuas, xws li ntxiv cov tshuaj antioxidants, lub teeb stabilizers lossis humectants, los tiv thaiv nws los ntawm kev cuam tshuam ntawm lub teeb, tshav kub lossis lwm yam tshuaj.
Txoj kev hluavtaws ntawm Avobenzone (4-aminobenzoic acid - 2 - (4-methoxyphenyl) - 2-oxy-1,3-dimercaptopentane) yog raws li nram no:
1. Synthesis ntawm 4-aminobenzoic acid (PABA): cov tshuaj tiv thaiv ntawm benzoic acid nrog ammonia, txo, oxidation thiab lwm cov kauj ruam thaum kawg tau txais PABA.
2. Synthesis ntawm 4-methoxyphenylacetone: 4-methoxyphenylacetone yog tau los ntawm cov tshuaj tiv thaiv ntawm acetophenone nrog methanol los ntawm acid catalysis thiab methylation.
3. Synthesis ntawm 2-hydroxy-4-methoxybenzophenone: 2-hydroxy-4-methoxybenzophenone tau los ntawm cov tshuaj tiv thaiv ntawm 4-methoxyphenylethanone nrog benzodioxane 3,4-dione (BMDBM) los ntawm kev txo qis thiab recrystallization.
4. Synthesis of Avobenzone: 4-aminobenzoic acid, 2-hydroxy-4-methoxybenzophenone, 1,3-dimercaptopentane thiab lwm cov tshuaj yog reacted, thiab thaum kawg Avobenzone yog tau los ntawm condensation, acylation thiab lwm cov kauj ruam.
Txoj kev hluavtaws ntawm Avobenzone yog qhov nyuaj, yuav tsum muaj cov tshuaj tiv thaiv ntau kauj ruam thiab cov cuab yeej siv hluavtaws complex.
Avobenzone yog ib qho dav-spectrum UVA absorbent, uas tau pom tias muaj cov tshuaj tiv thaiv tshav ntuj thaum ntxov li xyoo 1960. Nrog rau kev nkag siab tob ntawm tib neeg txoj kev nkag siab txog kev puas tsuaj ntawm cov hluav taws xob ultraviolet, cov khoom siv tshuaj pleev thaiv hnub tau siv dav, thiab Avobenzone kuj tau siv los ua cov tshuaj pleev thaiv hnub tseem ceeb.
Txawm li cas los xij, kev ruaj ntseg ntawm Avobenzone hauv tshuaj pleev thaiv hnub tau ib txwm muaj teeb meem. Nyob rau hauv lub teeb, oxidation thiab lwm qhov chaw, Avobenzone yog ib qho yooj yim rau decompose, yog li poob nws cov tshuaj pleev thaiv hnub. Txhawm rau daws qhov teeb meem no, tib neeg tau ua ntau yam kev tshawb fawb thiab pom tias kev ruaj ntseg ntawm Avobenzone tuaj yeem txhim kho los ntawm kev ntxiv lwm cov tshuaj, xws li lub teeb stabilizers thiab antioxidants.
Tam sim no, Avobenzone tseem yog ib feem tseem ceeb ntawm cov tshuaj pleev thaiv hnub, thiab nws cov tshuaj tiv thaiv hnub ci tau lees paub thoob ntiaj teb. Nrog rau qhov kev thov ntau ntxiv rau cov khoom xyaw tshuaj pleev thaiv hnub, tib neeg tseem tab tom nrhiav kev ruaj khov thiab siv tshuaj pleev thaiv hnub zoo. Nyob rau hauv lub neej yav tom ntej, Avobenzone txoj kev loj hlob zeem muag tseem dav heev, tab sis nws xav tau kev txhim kho txuas ntxiv thiab kev tsim kho tshiab los txhim kho nws txoj kev ruaj ntseg thiab tshuaj pleev thaiv hnub. Nyob rau tib lub sijhawm, nws tseem yuav tsum tau saib xyuas kev nyab xeeb ntawm tib neeg lub cev thiab ib puag ncig.