Xyoo 2019, US FDA tau tshaj tawm tsab ntawv tshaj tawm tshiab hais tias ntawm 16 cov tshuaj pleev thaiv hnub tiv thaiv tam sim no hauv Asmeskas kev lag luam, zinc oxide thiab titanium dioxide tau ntxiv rau cov khoom siv tshuaj pleev thaiv hnub ua "GRASE" (feem ntau lees paub tias muaj kev nyab xeeb thiab siv tau).PABA thiab Trolamine Salicylate tsis yog "GRASE" rau kev siv tshuaj pleev thaiv hnub vim muaj teeb meem kev nyab xeeb.Txawm li cas los xij, cov ntsiab lus no raug tshem tawm ntawm cov ntsiab lus, thiab nws tau nkag siab tias tsuas yog cov tshuaj pleev thaiv hnub lub cev-nano zinc oxide thiab titanium dioxide-muaj kev nyab xeeb thiab siv tau zoo hauv cov tshuaj pleev thaiv hnub cov khoom xyaw, lwm cov tshuaj pleev thaiv hnub tsis muaj kev nyab xeeb thiab siv tau.Qhov tseeb, qhov kev nkag siab zoo yog tias txawm hais tias US FDA txiav txim siab nano-zinc oxide thiab titanium dioxide los ua "GRASE", nws tsis tau txhais hais tias lwm 12 cov tshuaj pleev thaiv hnub tsis yog GRASE, tab sis lawv tseem tsis muaj cov ntaub ntawv muaj kev nyab xeeb txaus los ua pov thawj. .Tib lub sijhawm, FDA tseem tab tom thov cov tuam txhab cuam tshuam los muab cov ntaub ntawv txhawb kev nyab xeeb ntxiv.
Tsis tas li ntawd, FDA kuj tau ua qhov kev sim tshuaj ntsuam xyuas ntawm "kev nqus tshuaj pleev thaiv hnub los ntawm daim tawv nqaij mus rau hauv cov ntshav" thiab pom tias qee cov tshuaj pleev thaiv hnub muaj cov khoom xyaw hauv cov tshuaj pleev thaiv hnub, yog tias nqus tau los ntawm lub cev ntawm qib siab, yuav ua rau muaj teeb meem kev noj qab haus huv.pheej hmoo.Thaum cov txiaj ntsig ntawm qhov kev sim tau tshaj tawm, lawv tau txhawb kev sib tham thoob plaws ntiaj teb, thiab maj mam ua rau kev nkag siab yuam kev los ntawm cov neeg siv khoom uas tsis paub qhov tseeb.Lawv ntseeg ncaj qha tias cov tshuaj pleev thaiv hnub tuaj yeem nkag mus rau hauv cov ntshav thiab tsis muaj kev nyab xeeb rau tib neeg lub cev, thiab txawm tias ib leeg ntseeg tias cov tshuaj pleev thaiv hnub muaj teeb meem rau kev noj qab haus huv thiab siv tsis tau.
Nws tau tshaj tawm tias FDA tau nrhiav 24 tus neeg tuaj yeem pab dawb, muab faib ua 4 pawg, thiab kuaj cov tshuaj pleev thaiv hnub muaj 4 yam tshuaj pleev thaiv hnub sib txawv hauv cov qauv.Ua ntej tshaj plaws, cov neeg tuaj yeem pab dawb tau pab 75% ntawm tag nrho lub cev ntawm daim tawv nqaij, raws li tus qauv noj 2mg / cm2, 4 zaug hauv ib hnub rau 4 hnub sib law liag los siv tshuaj pleev thaiv hnub.Tom qab ntawd, cov qauv ntshav ntawm cov neeg ua haujlwm pab dawb tau sau rau 7 hnub sib law liag thiab cov ntsiab lus ntawm cov tshuaj pleev thaiv hnub hauv cov ntshav tau kuaj.Cov kev tshawb fawb tau pom tias daim tawv nqaij ntawm tus neeg laus yog li 1.5-2 ㎡.Piv txwv li tus nqi nruab nrab ntawm 1.8 ㎡, yog xam raws li tus qauv tus nqi, tshuaj pleev thaiv hnub siv d los ntawm cov neeg tuaj yeem pab dawb yog kwv yees li 2 × 1.8 × 10000 / 1000 = 36g hauv qhov kev sim, thiab tus nqi rau 4 zaug hauv ib hnub yog 36 × 4 = 144g ua.Feem ntau, thaj tsam ntawm daim tawv nqaij ntawm lub ntsej muag yog li 300-350cm², ib daim ntawv thov tshuaj pleev thaiv hnub txaus los tiv thaiv tag nrho hnub.Nyob rau hauv txoj kev no, tus nqi ntawm kev siv yog 2 × 350 / 1000 = 0.7g, txawm tias cov repaint suav nrog, nws yog li 1 .0 ~ 1.5g.Yog tias noj s qhov siab tshaj plaws ntawm 1.5 grams, qhov kev suav yog 144/1.5 = 96 npaug .Thiab cov tshuaj pleev thaiv hnub siv los ntawm cov neeg tuaj yeem pab dawb rau 4 hnub sib law liag yog 144 × 4 = 576g, thaum lub hnub siv tshuaj pleev thaiv hnub siv los ntawm cov neeg zoo tib yam rau 4 hnub yog 1.5 × 4 = 6g.Yog li ntawd, qhov sib txawv ntawm qhov ntau npaum ntawm 576 grams thiab 6 grams tshuaj pleev thaiv hnub yog qhov loj heev thiab qhov cuam tshuam yog pom tseeb.
Cov tshuaj pleev thaiv hnub uas tau sim los ntawm FDA hauv qhov kev sim no yog benzophenone-3, octoclilin, avobenzone, thiab TDSA.Ntawm lawv, tsuas yog cov ntaub ntawv tshawb pom ntawm benzophenone-3 deb tshaj qhov hu ua "kev nyab xeeb tus nqi", kwv yees li 400 npaug tshaj tus qauv, octocrylene thiab avobenzone yog ob qho tib si hauv 10 zaug, thiab p-xylylenedicamphorsulfonic acid Nws tsis pom.
Raws li txoj cai, kev siv cov tshuaj pleev thaiv hnub tsis tu ncua yuav ua rau muaj txiaj ntsig zoo.Nws tsis yog qhov xav tsis thoob tias txawm tias cov tshuaj pleev thaiv hnub tau kuaj pom hauv cov ntshav raws li qhov kev sim siab heev.Cov tshuaj pleev thaiv hnub tau pom zoo thiab siv ntau tshaj kaum xyoo, ntau lub teb chaws tau tswj cov tshuaj pleev thaiv hnub ua tshuaj, thiab txog tam sim no tsis muaj cov ntaub ntawv tshawb fawb txaus los ua pov thawj tias lawv muaj cov kev mob tshwm sim hauv tib neeg lub cev.
Post lub sij hawm: Sep-09-2022
