Ngo-2019, i-US FDA yamemezela isiphakamiso esisha esithi phakathi kwezithako eziyi-16 ezisebenzayo zaseSunnscreen njengamanje ezimakethe zase-US, iZinc onide ne-titanium dioxide ingezwe kwimikhiqizo ye-sunscreen njenge-Performs. I-PABA neTrolamine Salicylate akuyona "i-grase" ukuze isetshenziswe kuma-sunscreens ngenxa yezinkinga zokuphepha. Kodwa-ke, lokhu okuqukethwe kuthathwa ngaphandle komongo, futhi kuyaqondakala ukuthi kuphela ama-ejenti welanga elithi agents-nano zic oxide kanye ne-titanium dioxide - aphephile futhi asebenza ngempumelelo kwezithako ezisebenzayo ze-sunscreen, amanye ama-ejenti amakhemikhali aphethwe aphephile futhi aphumelele. Eqinisweni, ukuqonda okuyikho ukuthi yize i-US FDA ibheka i-nano-zinc oxide kanye ne-titanium dioxide ukuba "i-grase", kepha akusho ukuthi amanye ama-ejenti ane-snianscreen angu-12 awakhombisi. Ngasikhathi sinye, i-FDA nayo ibuza izinkampani ezifanele ukuhlinzeka ngemininingwane yokusekelwa kokuphepha okwengeziwe.
Ngaphezu kwalokho, i-FDA iphinde yaqhuba isivivinyo somtholampilo "ekutholeni ilanga ngesikhumba esigcawini" futhi yathola ukuthi ezinye izithako ezisebenzayo ze-sunscreen ezingeni eliphakeme, zingadala izinkinga zempilo. ubungozi. Lapho nje imiphumela yokuhlolwa ishicilelwe, bavusa ingxoxo ebanzi emhlabeni wonke, futhi kancane kancane babangela ukungaboni ngasolinye kwabathengi abajwayelekile abangayazi iqiniso. Babekholelwa ngqo ukuthi ama-sunscreens angangena egazini futhi angaphephile emzimbeni womuntu, futhi ngisho nesinye esikholelwa ukuthi ama-sunscreens alimaza impilo futhi awakwazi ukusetshenziswa.
Kubikwa ukuthi i-FDA yaqasha amavolontiya angama-24, ihlukaniswe ngamaqembu ama-4, futhi ihlolwe ama-sunscreens aqukethe ama-sunscreens ama-4 ahlukene kwifomula. Okokuqala, amavolontiya anikela ngo-75% wesikhumba somzimba wonke, ngokusho komthamo ojwayelekile we-2mg / cm2, amahlandla ama-4 ngosuku izinsuku ezi-4 zilandelana ukusebenzisa i-sunscreen. Ngemuva kwalokho, amasampula egazi amavolontiya aqoqwe izinsuku ezingama-7 alandelana futhi okuqukethwe yi-sunscreen egazini kwahlolwa. Ucwaningo selukhombisile ukuthi indawo yesikhumba yomuntu omdala imayelana ne-1.5-2 ㎡. Ukuthatha inani eliphakathi le-1.8 ㎡, uma libalwa ngokuya ngenani elijwayelekile, ukusetshenziswa kwelanga kwe-sunscreen d ngamavolontiya kumayelana ne-2 × 1.8 × 10000/1000 = 36g ku-36 × 4 = 144g. Imvamisa, i-T He Facial Skin Area imayelana nama-300-350cm², uhlelo olulodwa lwe-sunscreen lwanele ukuvikela usuku lonke. Ngale ndlela, inani lokusetshenziswa elibaliwe lingu-2 × 350/1000 = 0.7g, noma ngabe ukuphindaphinda kufakiwe, cishe ku-1 .0 ~ 1.5g. Uma uthatha inani eliphakeme lamagremu ayi-1.5, ukubalwa kungu-144 / 1.5 = amahlandla angama-96 Ngakho-ke, umehluko phakathi komthamo wama-gramu angama-576 nama-6 amagremu we-sunscreen mkhulu kakhulu futhi umthelela usobala.
Ama-sunscreen ahlolwe yi-FDA kulokhu kuhlolwa kwakuyi-benzophenone-3, octoclilin, i-avobenzone, ne-TDSA. Phakathi kwazo, idatha kuphela yokutholwa kweBenzophenone-3 idlula kude le-Security ebizwa nge- "Security Value", cishe izikhathi ezingama-400 ezidlula ezikhathini ezingama-10, futhi i-P-XylyLenicamhorSorforforsulfonforsulfonforsulfonforsulfonforsulfonforsulfonforsulfonforic ayitholakali.
Ngokweqiniso, ukusetshenziswa okuqhubekayo okuphezulu kwe-sunscreen kuzodala umphumela wokuqongelela. Akumangazi ukuthi ngisho nama-sunscreens atholakala egazini ngaphansi kwezimo zokuhlola ezedlulele. Ama-sunscreens avunyiwe futhi asetshenziswa isikhathi esingaphezu kwamashumi eminyaka, amazwe amaningi alawule ama-sunscreens njengemithi, kuze kube manje ayikho idatha eyanele yokucwaninga ekhombisa ukuthi inemiphumela emibi ehleliwe emzimbeni womuntu.
Isikhathi Sokuposa: Sep-09-2022
