nkhani

Masiku ano anthu ali ndi zosankha zambiri pa chisamaliro cha khungu, zosakaniza zoteteza ku dzuwa ndi mitundu yoposa 10, koma zinthu zina zosamalira khungu zimaoneka kuti zimavulaza khungu lathu. Ndiye tingasankhe bwanji zinthu zoyenera zosamalira khungu lathu? Tiyeni tikambirane za benzophenone-4, chinthu chofunikira kwambiri mu zinthu zosamalira khungu.

Kodi benzophenone-4 ndi chiyani?

Benzophenone-4ndi mankhwala a benzophenone, otchedwa BP-4, chemical formula C14H12O6S. Ndi ufa woyera kapena wachikasu wopepuka kutentha kwa chipinda ndipo umatha kuyamwa bwino kuwala kwa UV kwa madigiri 285 mpaka 325. Monga choyamwa cha ultraviolet chochuluka, BP-4 ili ndi ubwino wokhala ndi kuchuluka kwa kuyamwa, kosakhala poizoni, kosakhala ndi teratogenic, kuwala kwabwino komanso kukhazikika kwa kutentha, ndi zina zotero. Choyamwa cha UV BP-4 chimatha kuyamwa UV-A ndi UV-B nthawi imodzi, ndi choyamwa cha kalasi I chovomerezedwa ndi United States FDA, United States ndi mayiko aku Europe amagwiritsa ntchito pafupipafupi, makamaka mu kirimu wa sunscreen ndi zodzoladzola zina za sunscreen.

Choyamwa cha UV BP-4Sili ndi poizoni, siliyaka moto, siliphulika, silimayamwa mosavuta chinyezi mumlengalenga, ndi lothandiza kwambiri poyamwa UV m'madzi, limatha kuyamwa kuwala kwa UV kwambiri. Limagwiritsidwa ntchito kwambiri ngati choyamwa ultraviolet cha zophimba polymer zochokera m'madzi ndi utoto wofiirira kuti lipewe kusungunuka kwa photocatalytic kwa zophimba polymer zochokera m'madzi ndi utoto wofiirira; Ndi choteteza ku dzuwa chabwino cha zodzoladzola komanso choyamwa UV kuti chiwongolere kukana kwa nyengo kwa nsalu za ubweya.

Benzophenone imagwiritsidwa ntchito kwambiri pazinthu zapakhomo monga magalasi a dzuwa, ma CD a chakudya, zovala ndi zinthu zoyeretsera kuti zisawonongeke ndi UV. Ikhoza kuipitsa madzi akumwa ndikusintha kuchoka pa ma CD a chakudya kupita ku chakudya. Benzophenone imagwiritsidwa ntchito mu inki zina zopakira chakudya ndipo ingasinthe kukhala chakudya. Benzophenone imapezeka mwachilengedwe muzakudya zina (monga mphesa za vinyo ndi mphesa za Muscat) ndipo imawonjezedwa ku zina ngati chokometsera.

Mu zinthu zosamalira thupi, benzophenone imagwiritsidwa ntchito ngati chowonjezera fungo kapena kuteteza zinthu monga sopo kuti zisatayike fungo ndi mtundu wawo pansi pa kuwala kwa ultraviolet. Zinthu zochokera ku Benzophenone monga BP2 ndi oxybenzone (BP3) ndibenzophenone-4 (BP-4)amagwiritsidwa ntchito mu zodzoladzola za dzuwa. Oxybenzone imagwiritsidwa ntchito ngati choyamwitsa ndi chokhazikika cha ultraviolet, makamaka mu mapulasitiki ndi zodzoladzola za dzuwa. Benzophenone ndi oxybenzone zimagwiritsidwanso ntchito mu zodzoladzola za misomali ndi mafuta a milomo.

Kodi benzophenone-4 imagwiritsidwa ntchito bwanji posamalira khungu?

Choletsa kuwala kwa UV BP-4 chili ndi ubwino wokhala ndi kuwala kwabwino komanso kukhazikika kwa kutentha, ndipo chimagwiritsidwa ntchito kwambiri mu zodzoladzola zoteteza ku dzuwa, kirimu, uchi, mafuta odzola, mafuta ndi zodzoladzola zina zoteteza ku dzuwa. Choyenera kwambiri pa mafuta oteteza ku dzuwa, mafuta odzola, utoto, mlingo wamba ndi 0.1-0.5%. Mlingo wamba ndi 0.2-1.5%.

Choyatsira UVBP-4Amasungunuka mosavuta m'madzi, ndipo madzi amadzi ndi acidic, kotero amafunika kuchepetsedwa mphamvu mukamagwiritsa ntchito. PH yoposa 9 imapangitsa kuti mphamvu ya kuyamwa ichepe, ndipo kugwiritsa ntchito kwambiri mafuta oteteza khungu tsiku ndi tsiku ndi zinthu zina zosamalira khungu kuti apewe kukalamba kwa khungu chifukwa cha kuwala kwa ultraviolet.

Kodi benzophenone-4 imagwiritsidwa ntchito bwanji posamalira khungu?