Ngaphambi kokuthenga ukhilimu omusha we-SPF, qiniseka ukuthi ufunda lokho okubhalwe ephaketheni.
Izimonyo zokuvikela ilanga ziklanyelwe ukuvikela isikhumba emisebeni ye-ultraviolet (UV-B ne-UV-A), ukuvimbela ukushiswa yilanga, ukuvikela umgoqo wesikhumba, ngaleyo ndlela kuvimbele ukuthwebula izithombe, ukucekelwa phansi kwemicu ye-collagen, i-hyperpigmentation, kanye nokukhula komdlavuza wesikhumba.
Udokotela-i-cosmetologist yesikhala sobuhle se-FACEOLOGY.
Nokho, abaningi babheka izimonyo zokuvikela ilanga njengezinto eziyimpikiswano kakhulu embonini yobuhle. Ngokombono wokukhiqiza, kudinga isisekelo esihle sesayensi nezobuchwepheshe, ngakho-ke, lapho ukhetha ithuluzi elinjalo, umuntu kufanele anikeze okuthandayo kumikhiqizo eyaziwayo. Namuhla zikhona ngokomzimba и Amakhemikhali izihlungi ezifakwe kuzimonyo zokuvikela ilanga. Kukhona nezihlungi zemithi, njengamavithamini athile, amafutha abalulekile kanye nolwelwe, okuvame ukungezwa ezimonyoni eziqukethe izihlungi zomzimba noma zamakhemikhali. Azisetshenziswa ngokwazo njengesithako esiyinhloko sokuvikela ilanga.
Action izihlungi ezibonakalayo ngokusekelwe ekukhanyeni kwemisebe ye-UV, kukhona ezimbili kuphela zazo - i-titanium dioxide (i-titanium dioxide) ne-zinc oxide (i-zinc oxide). Zinokusebenza okuhle kakhulu kokuphepha futhi zivikela isikhumba emisebeni eminingi ye-UV. I-drawback yabo kuphela Ngoba bangakwazi ukushiya imigqa emhlophe uma ifakwe esikhumbeni, "i-overload" i-stratum corneum futhi iphazamise ukukhishwa okuvamile, kodwa abakhiqizi bezimonyo besimanje bazama ukuvimbela lokhu ngokusebenzisa ama-nanoparticles amancane alezi zinto. Izihlungi ezinjalo ezibonakalayo azifuneki ukuthi zisetshenziswe esikhumbeni esilimele.
"Umsebenzi" izihlungi zamakhemikhali ngokusekelwe ekumunceni nasekuguquleni amandla e-ultraviolet abe yimisebe ye-infrared, okungukuthi, ukushisa. Kuma-sunscreens wezimonyo, njengomthetho, eziningana zazo zisetshenziswa ngesikhathi esisodwa. Okuyingozi kakhulu, ngokombono wethu, yilabo abangangena egazini futhi babe nomphumela wesistimu.
Lezi zithako zihlanganisa:
- iqembu lama-para-aminobenzoate (aminobenzoic acid (aminobenzoic acid);
- amyl dimethyl PABA (amyl dimethyl PABA);
- i-octyl dimethyl PABA;
- i-glyceryl aminobenzoate, njll.), i-carcinogenicity yabo, umphumela ohlelweni lwezinzwa nokujikeleza kwegazi kuye kwafakazelwa;
- i-benzophenones, i-benzophenone-3 (i-benzophenone-XNUMX) ivame kakhulu, kanye namanye amagama ezithako zaleli qembu: i-avobenzone (аvobenzone), i-dioxybenzone, i-oxybenzone (i-oxybenzone), njll. uhlelo lwe-endocrine (ukuvuselela ukukhiqizwa kwe-estrogens nokucindezela ukukhiqizwa kwe-androgens);
– padimate O (padimate O) kungabangela contact dermatitis;
- i-homosalate (i-homosalate) ivimbela ukukhiqizwa kwe-estrogen, i-progesterone ne-testosterone;
– meradimate. Kunobufakazi ocwaningweni bokuthi kungandisa ukugcwala kwezinhlobo ze-oxygen esebenzayo;
- i-octinoxate (i-octól methoxócinnamate), i-octocrylene (i-octocrulene) ithinta uhlelo lwe-endocrine.
Yingakho udinga ukuhlola ukwakheka kwe-sunscreen ngaphambi kokuthenga. Uma uthola enye yalezi zithako ekubunjweni, kufanele wenqabe ukuthenga nokusebenzisa umkhiqizo onjalo.