xov xwm

Kev tiv thaiv hnub yog qhov yuav tsum muaj rau cov poj niam niaj hnub no thoob plaws hauv ib xyoos. Kev tiv thaiv hnub tsis yog tsuas yog txo qhov kev puas tsuaj ntawm cov duab ultraviolet rau ntawm daim tawv nqaij xwb, tab sis kuj tiv thaiv kev laus ntawm daim tawv nqaij thiab cov kab mob ntawm daim tawv nqaij. Cov khoom xyaw ntawm cov tshuaj pleev thaiv hnub feem ntau yog ua los ntawm cov khoom siv lub cev, tshuaj lom neeg, lossis sib xyaw ntawm ob hom thiab muab kev tiv thaiv dav dav UV. Yuav kom pab koj yuav lawv cov tshuaj pleev thaiv hnub zoo dua yav tom ntej, hnub no coj koj los ntawm cov khoom xyaw tshuaj lom neeg thiab cov khoom xyaw lub cev los tshuaj xyuas cov khoom xyaw zoo ntawm cov tshuaj pleev thaiv hnub.

Cov tshuaj lom neeg nquag ua ke

Octyl methoxycinnamate

Octyl methoxycinnamate (OMC)yog ib qho ntawm cov tshuaj pleev thaiv hnub uas siv ntau tshaj plaws. Octyl methoxycinnamate (OMC) yog lub lim UVB nrog cov kab nqus UV zoo heev ntawm 280 ~ 310 nm, tus nqi nqus siab, kev nyab xeeb zoo, tsis muaj tshuaj lom, thiab yaj tau zoo rau cov roj raw. Kuj hu ua octanoate thiab 2-ethylhexyl 4-methoxycinnamate. Cov tshuaj no tau pom zoo ua cov khoom xyaw pleev kom zoo nkauj hauv Tebchaws Meskas thiab European Union (EU) ntawm qhov ntau ntawm 7.5-10%.

Benzophenone-3

Benzophenone-3(BP-3) yog ib hom tshuaj pleev thaiv hnub uas yaj tau hauv roj thiab nqus tau ob qho tib si UVB thiab UVA luv luv. BP-3 raug oxidized sai sai hauv qab ultraviolet radiation, ua rau nws tsis ua haujlwm zoo thiab tsim cov tshuaj reactive oxygen ntau heev. Hauv Tebchaws Meskas, qhov concentration siab tshaj plaws ntawm BP-3 hauv tshuaj pleev thaiv hnub yog 6%.

Benzophenone -4

Benzophenone-4(BP-4) feem ntau siv ua lub zog nqus ultraviolet ntawm qhov concentration txog li 10%. BP-4, zoo li BP-3, yog ib qho benzophenone derivative.

4-methylbenzyl camphor

4-methylbenzylidene camphor (4-methylbenzylidene camphor, 4-MBC) lossis enzacamene yog ib qho organic camphor derivative siv ua UVB absorber hauv sunscreens thiab lwm yam tshuaj pleev ib ce. Txawm hais tias cov tshuaj no tsis tau pom zoo los ntawm US Food and Drug Administration (FDA), lwm lub tebchaws tso cai rau kev siv cov tshuaj no hauv cov concentration txog li 4%.

4-MBC yog ib qho khoom siv lipophilic heev uas tuaj yeem nqus tau los ntawm daim tawv nqaij thiab muaj nyob rau hauv tib neeg cov ntaub so ntswg, suav nrog lub placenta. 4-MBC muaj cov nyhuv ntawm estrogen endocrine cuam tshuam, cuam tshuam rau thyroid axis thiab inhibiting kev ua haujlwm ntawm AChE. Yog li ntawd, tshuaj pleev thaiv hnub uas muaj cov khoom xyaw no yuav tsum tau siv nrog kev ceev faj.

3-benzal camphor

3-benzylidene camphor (3-BC) yog ib qho lipophilic compound uas muaj feem cuam tshuam nrog 4-MBC. Qhov siab tshaj plaws ntawm nws siv rau hauv cov khoom siv tshuaj pleev thaiv hnub hauv European Union yog 2%.

Ib yam li 4-MBC, 3-BC kuj piav qhia tias yog ib yam tshuaj uas ua rau estrogen cuam tshuam. Tsis tas li ntawd xwb, 3-BC tau raug tshaj tawm tias cuam tshuam rau CNS. Dua li no, cov tshuaj pleev thaiv hnub uas muaj cov khoom xyaw no yuav tsum tau siv nrog kev ceev faj.

Octylene

Octocrtriene (OC) yog ib qho ester uas koom nrog pawg cinnamate uas nqus tau UVB thiab UVA, nrog rau qhov ntau txog li 10% hauv cov tshuaj pleev thaiv hnub thiab cov tshuaj pleev ib ce txhua hnub.

Cov khoom siv lub cev nquag

Cov khoom xyaw nquag siv hauv cov tshuaj pleev thaiv hnub feem ntau yog titanium dioxide (TiO2) thiab zinc oxide (ZnO), thiab lawv cov concentration feem ntau yog 5-10%, feem ntau yog los ntawm kev cuam tshuam lossis tawg cov teeb meem ultraviolet radiation (UVR) kom ua tiav lub hom phiaj ntawm tshuaj pleev thaiv hnub.

Titanium dioxide

Titanium dioxide yog cov hmoov dawb uas muaj titanium thiab oxygen. Titanium dioxide siv dav hauv cov khoom noj thiab cov tshuaj pleev ib ce, tshwj xeeb tshaj yog vim nws dawb thiab qhov ua tau zoo ntawm cov tshuaj pleev thaiv hnub UV.

Zinc oxide

Zinc oxide yog ib hom hmoov dawb uas muaj cov yam ntxwv tiv thaiv thiab ua kom huv. Nws kuj yog ib yam tshuaj pleev thaiv hnub UV uas tiv thaiv tau ob qho tib si UVA thiab UVB. Tsis tas li ntawd, zinc muaj cov yam ntxwv tiv thaiv kev o, ua kom daim tawv nqaij qhuav thiab ua kom qhuav. Zinc oxide, ib yam tshuaj pleev thaiv hnub uas tau lees paub tias muaj kev nyab xeeb thiab ua tau zoo los ntawm US Food and Drug Administration, yog ib qho ntawm lawv.

Tom qab piav qhia txog tsab xov xwm no tas, koj puas nkag siab zoo dua txog cov khoom xyaw nquag ntawm cov tshuaj pleev thaiv hnub? Thov hu rau kuv yog tias koj muaj lus nug ntxiv.