Raws li qhov kev thov kom muaj kev tiv thaiv hnub zoo txuas ntxiv mus, kev lag luam tshuaj pleev ib ce tau pom qhov kev hloov pauv zoo kawg nkaus hauv cov khoom xyaw siv rau hauv cov tshuaj pleev thaiv hnub. Tsab xov xwm no tshawb nrhiav txoj kev taug kev ntawm kev nce qib ntawm cov khoom xyaw hauv cov tshuaj pleev thaiv hnub, qhia txog qhov cuam tshuam hloov pauv rau cov khoom tiv thaiv hnub niaj hnub no.
Kev Tshawb Fawb Txog Cov Khoom Xyaw Thaum Ntxov:
Thaum pib siv cov tshuaj pleev thaiv hnub, cov khoom xyaw ntuj xws li cov nroj tsuag, cov zaub mov, thiab cov roj feem ntau siv los tiv thaiv lub hnub tsawg. Txawm hais tias cov khoom xyaw no muaj qee qib kev thaiv UV, lawv cov txiaj ntsig tsis zoo thiab tsis muaj cov txiaj ntsig ntev.
Kev Taw Qhia Txog Cov Lim Dej Organic:
Kev tshawb pom tshiab hauv cov tshuaj pleev thaiv hnub tau los nrog kev qhia txog cov lim dej organic, tseem hu ua UV absorbers. Nyob rau nruab nrab xyoo pua 20th, cov kws tshawb fawb tau pib tshawb nrhiav cov organic compounds uas muaj peev xwm nqus tau hluav taws xob UV. Benzyl salicylate tau tshwm sim ua tus thawj coj hauv daim teb no, muab kev tiv thaiv UV nruab nrab. Txawm li cas los xij, kev tshawb fawb ntxiv yog qhov tsim nyog los txhim kho nws cov txiaj ntsig.
Kev nce qib hauv kev tiv thaiv UVB:
Xyoo 1940, kev tshawb pom para-aminobenzoic acid (PABA) tau ua lub hauv paus tseem ceeb hauv kev tiv thaiv hnub. PABA tau los ua cov khoom xyaw tseem ceeb hauv cov tshuaj pleev thaiv hnub, nqus tau cov teeb UVB uas ua rau kub hnyiab. Txawm hais tias nws ua haujlwm tau zoo, PABA muaj cov kev txwv, xws li ua rau daim tawv nqaij khaus thiab ua xua, ua rau xav tau lwm cov khoom xyaw.
Kev Tiv Thaiv Dav Dav:
Thaum kev paub txog kev tshawb fawb nthuav dav, qhov kev tsom mus rau kev tsim cov khoom xyaw uas tuaj yeem tiv thaiv tau ob qho tib si UVB thiab UVA. Xyoo 1980, avobenzone tau tshwm sim ua lub lim dej UVA zoo, ua kom tiav qhov kev tiv thaiv UVB uas twb muaj lawm los ntawm PABA-based sunscreens. Txawm li cas los xij, avobenzone qhov kev ruaj khov hauv qab lub hnub ci yog qhov nyuaj, ua rau muaj kev tsim kho tshiab ntxiv.
Kev ruaj khov ntawm cov duab thiab kev tiv thaiv UVA zoo dua:
Txhawm rau daws qhov tsis ruaj khov ntawm cov lim UVA thaum ntxov, cov kws tshawb fawb tau tsom mus rau kev txhim kho photostability thiab kev tiv thaiv dav dav. Cov khoom xyaw xws li octocrylene thiab bemotrizinol tau tsim, muab kev ruaj khov zoo dua thiab kev tiv thaiv UVA zoo dua. Cov kev nce qib no tau txhim kho qhov kev ua tau zoo thiab kev ntseeg siab ntawm cov tshuaj pleev thaiv hnub.
Cov lim dej UVA organic:
Nyob rau xyoo tas los no, cov lim dej UVA organic tau txais txiaj ntsig zoo vim lawv txoj kev tiv thaiv UVA zoo heev thiab kev ruaj khov zoo dua. Cov tshuaj xws li Mexoryl SX, Mexoryl XL, thiab Tinosorb S tau hloov pauv cov tshuaj pleev thaiv hnub, muab kev tiv thaiv UVA zoo. Cov khoom xyaw no tau dhau los ua qhov tseem ceeb rau cov qauv tiv thaiv hnub niaj hnub no.
Cov Txheej Txheem Tsim Khoom Tshiab:
Nrog rau kev nce qib ntawm cov khoom xyaw, cov txheej txheem tsim cov tshuaj tshiab tau ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua haujlwm ntawm cov tshuaj pleev thaiv hnub. Nanotechnology tau tsim txoj hauv kev rau cov khoom me me, muab kev npog pob tshab thiab txhim kho kev nqus UV. Cov thev naus laus zis encapsulation kuj tau siv los txhim kho kev ruaj khov thiab ua kom zoo dua qhov kev xa khoom ntawm cov khoom xyaw, kom ntseeg tau tias muaj txiaj ntsig zoo tshaj plaws.
Cov Kev Xav Txog Kev Cai Lij Choj:
Vim muaj kev nkag siab ntau ntxiv txog cov khoom xyaw ntawm cov tshuaj pleev thaiv hnub uas cuam tshuam rau tib neeg txoj kev noj qab haus huv thiab ib puag ncig, cov koom haum tswj hwm tau siv cov lus qhia thiab kev txwv. Cov khoom xyaw xws li oxybenzone thiab octinoxate, uas paub txog lawv qhov cuam tshuam rau ib puag ncig, tau ua rau kev lag luam tsim lwm txoj hauv kev, muab qhov tseem ceeb rau kev nyab xeeb thiab kev ruaj khov.
Xaus lus:
Kev hloov pauv ntawm cov khoom xyaw hauv cov tshuaj pleev thaiv hnub tau hloov pauv kev tiv thaiv hnub hauv kev lag luam tshuaj pleev ib ce. Txij li cov lim dej organic thaum ntxov mus rau kev tsim cov kev tiv thaiv UVA siab heev thiab cov txheej txheem tsim cov tshuaj tshiab, kev lag luam tau ua tiav cov kauj ruam tseem ceeb. Kev tshawb fawb thiab kev txhim kho txuas ntxiv yuav tsav tsheb tsim cov khoom siv tshuaj pleev thaiv hnub muaj kev nyab xeeb dua, ua haujlwm tau zoo dua, thiab zoo rau ib puag ncig, kom ntseeg tau tias muaj kev tiv thaiv hnub zoo tshaj plaws rau cov neeg siv khoom.
Lub sijhawm tshaj tawm: Lub Peb Hlis-20-2024