Nanotechnology uye Nanomaterials: Nanometer Titanium Dioxide muSunscreen Cosmetics

Nanotechnology uye Nanomaterials: Nanometer Titanium Dioxide muSunscreen Cosmetics

Quote mazwi

Inenge 5% yemwaranzi inovhenekerwa nezuva ine ultraviolet mwaranzi ine wavelength ≤400 nm. Ultraviolet mwaranzi muchiedza chezuva inogona kupatsanurwa kuva: refu-wave ultraviolet mwaranzi ine wavelength ye 320 nm ~ 400 nm, inonzi A-mhando ultraviolet rays (UVA); Mwaranzi yeultraviolet yepakati nepakati ine wavelength ye290 nm kusvika 320 nm inonzi B-type ultraviolet rays (UVB) uye short-wave ultraviolet rays ine wavelength ye200 nm kusvika 290 nm inonzi C-type ultraviolet rays.

Nekuda kweurefu hwayo hupfupi nesimba rakawanda, mwaranzi yeultraviolet ine simba guru rekuparadza, rinogona kukuvadza ganda revanhu, kukonzera kuzvimba kana kupisa nezuva, uye kuburitsa zvakakomba kenza yeganda. UVB ndiyo inonyanya kukonzera kuzvimba kweganda uye kupisa kwezuva.

1. nheyo yekudzivirira ultraviolet rays ne nano TiO2

TiO _ 2 iN-mhando semiconductor. Iyo yekristaro fomu ye nano-TiO _ 2 inoshandiswa muzvizoro zvezuva rinowanzo rutile, uye bhendi rayo rinorambidzwa upamhi i3.0 eV Kana UV rays ine wavelength isingasviki 400nm irradiate TiO _ 2, maerekitironi ari pavalence bhendi anogona kutora UV mwaranzi uye kunakidzwa iyo conduction bhendi, uye erekitironi-gomba pairi anogadzirwa panguva imwe chete, saka TiO _ 2 ine basa rekutora mwenje weUV. Iine diki diki saizi uye akati wandei zvidimbu, Izvi zvinowedzera zvakanyanya mukana wekuvharira kana kuvharira ultraviolet mwaranzi.

2. Hunhu hwe nano-TiO2 mune sunscreen cosmetics

2.1

Yakakwira UV kudzivirira kunyatsoshanda

Iko ultraviolet kudzivirira kugona kwezvizoro zvezuva zvinoratidzwa ne sun protection factor (SPF value), uye iyo yakakwirira kukosha kweSPF, zviri nani kuita sunscreen. Huyero hwesimba rinodiwa kugadzira erythema yakadzikira paganda rakaputirwa nemishonga yezuva kune simba rinodiwa kugadzira erythema yedhigirii yakafanana paganda pasina zvigadzirwa zvezuva.

Sezvo nano-TiO2 inotora uye inoparadzira ultraviolet mwaranzi, inoonekwa seyakanyanya kunaka yekudzivirira zuva kumba nekune dzimwe nyika. Kazhinji, kugona kwe nano-TiO2 kudzivirira UVB ndeye 3-4 nguva ye nano-ZnO.

2.2

Yakakodzera particle size range

Iyo ultraviolet kudzivirira kugona kwe nano-TiO2 inotarwa nekugona kwayo kunyudza uye kugona kwekuparadzira. Iyo diki yepakutanga particle size ye nano-TiO2, iyo yakasimba iyo ultraviolet absorption kugona. Zvinoenderana nemutemo waRayleigh wekuparadzira mwenje, kune yakaringana yepakutanga particle saizi yehukuru hwekuparadzira kugona kwe nano-TiO2 kune ultraviolet mwaranzi ine akasiyana mafungu. Ongororo dzinoratidzawo kuti kurebesa kureba kwemwaranzi yeultraviolet,Kugona kudzivirira kwenano-TiO 2 kunoenderana zvakanyanya nekukwanisa kwayo kuparadzira; Kupfupika kwewavelength, kunowedzera kudzivirira kwayo kunoenderana nekugona kwayo kunyura.

2.3

Excellent dispersibility uye pachena

Iyo yepakutanga particle size ye nano-TiO2 iri pazasi pe100 nm, ishoma pane yavelength yechiedza chinooneka. Nechepfungwa, nano-TiO2 inogona kufambisa mwenje unooneka kana yapararira, saka inojeka. Nekuda kwekubuda pachena kwenano-TiO2, haizovhare ganda kana yawedzerwa muzvizoro zvezuva. Nokudaro, inogona kuratidza kunaka kweganda repanyama.Kujeka ndeimwe yezvinyorwa zvakakosha zve nano-TiO2 mune sunscreen cosmetics. Muchokwadi, nano-TiO 2 iri pachena asi haina kunyatsojeka mune sunscreen cosmetics, nekuti nano-TiO2 ine zvidimbu zvidiki, yakakura yakananga nzvimbo uye yakanyanya kukwirira pamusoro pesimba, uye zviri nyore kugadzira aggregates, zvichikanganisa kupararira uye kujeka kwe. zvigadzirwa.

2.4

Kuramba kwakanaka kwemamiriro ekunze

Nano-TiO 2 ye sunscreen cosmetics inoda kumwe kuramba kwemamiriro ekunze (kunyanya kureruka). Nekuda kwekuti nano-TiO2 ine twudiki twudiki uye kuita kwakakwira, inoburitsa maelectron-hole pairi mushure mekutora mwaranzi yeultraviolet, uye mamwe ma electron-hole pairs anotamira kumusoro, zvichikonzera atomic oxygen uye hydroxyl radicals mumvura inoshambadzirwa pamusoro pemvura. nano-TiO2, ine simba oxidation yakasimba.Ichakonzera kushanduka kwezvigadzirwa uye kunhuwa nekuda kwekuora kwezvinonhuwira. Naizvozvo, imwe kana anopfuura akajeka ekuzviparadzanisa akaturikidzana, senge silica, alumina uye zirconia, anofanirwa kuve akaputirwa pamusoro pe nano-TiO2 kuti inhibit basa rayo remifananidzo.

3. Mhando uye maitiro ekuvandudza nano-TiO2

3.1

Nano-TiO2 hupfu

Izvo nano-TiO2 zvigadzirwa zvinotengeswa nenzira yehupfu hwakasimba, iyo inogona kugoverwa kuva hydrophilic powder uye lipophilic powder maererano nepamusoro pezvinhu zve nano-TiO2. Hydrophilic powder inoshandiswa mumvura-based cosmetics, nepo lipophilic powder inoshandiswa mumafuta-based cosmetics. Hydrophilic powders inowanzo wanikwa ne inorganic surface treatment.Mazhinji eiyi ekunze nano-TiO2 powders akaitwa special surface treatment maererano neminda yavo yekushandisa.

3.2

Rudzi rweganda nano TiO2

Nekuti nano-TiO2 zvimedu zvakanaka uye zviri nyore kuparadzira mwenje webhuruu nehupfupi wavelength muchiedza chinooneka, kana yaiswa muzvizoro zvezuva, ganda rinoratidza toni yebhuruu uye kutaridzika zvisina kunaka. Kuti uenderane neruvara rweganda, mavara matsvuku akadai sesimbi oxide anowanzowedzerwa kune cosmetic formula mukutanga. Nekudaro, nekuda kwemusiyano mukuwanda uye kunyorova pakati pe nano-TiO2 _ 2 uye iron oxide, anoyangarara mavara anowanzoitika.

4. Mamiriro ekugadzira nano-TiO2 muChina

Tsvagiridzo diki-diki ye nano-TiO2 _ 2 muChina inoshanda zvakanyanya, uye danho rekutsvagisa redzidziso rasvika padanho repamusoro repasi rose, asi tsvakiridzo yakashandiswa uye tsvakiridzo yeinjiniya yakasarira kumashure, uye mibairo yakawanda yekutsvagisa haigone kushandurwa kuita zvigadzirwa zvemaindasitiri. Kugadzirwa kwemaindasitiri kwe nano-TiO2 muChina kwakatanga muna 1997, anopfuura makore gumi gare gare kupfuura Japan.

Pane zvikonzero zviviri zvinotadzisa kunaka uye kukwikwidza kwemusika kwe nano-TiO2 zvigadzirwa muChina:

① Tsvagiridzo yetekinoroji yakashandiswa inosarira kumashure

Iyo yekushandisa tekinoroji yekutsvaga inoda kugadzirisa matambudziko ekuwedzera maitiro uye maitiro ekuongorora nano-TiO2 mune inoumbwa system. Tsvagiridzo yekushandiswa kwenano-TiO2 muminda mizhinji haisati yanyatso gadzirwa, uye tsvagiridzo mune dzimwe nzvimbo, senge sunscreen cosmetics, ichiri kufanira kudzika.Nekuda kwekurebesa kwekutsvagisa tekinoroji, China's nano-TiO2 _ 2 zvigadzirwa. haigone kuumba serial brands kuti isangane nezvinodiwa zvakakosha zveminda dzakasiyana.

② Iyo yepamusoro yekurapa tekinoroji ye nano-TiO2 inoda kumwe kudzidza

Kurapa kwepamusoro kunosanganisira inorganic surface kurapwa uye organic surface kurapwa. Surface treatment tekinoroji inoumbwa neyepamusoro kurapwa mumiriri fomula, pamusoro pekurapa tekinoroji uye pamusoro pemidziyo yekurapa.

5. Mashoko okupedzisira

Kujeka, ultraviolet shielding performance, dispersibility uye light resistance ye nano-TiO2 mune sunscreen cosmetics zvakakosha tekinoroji indexes kutonga kunaka kwayo, uye maitiro ekugadzirisa uye nzira yekurapa pamusoro penano-TiO2 ndiyo kiyi yekuona idzi tekinoroji indexes.