Kev kho deg ntawm Titanium Dioxide nyob rau txawv teb chaws
Kev tsim cov titanium dioxide txawv teb chaws tau pib hauv xyoo 1916, thiab kev tsim cov khoom tsim tau cuam tshuam los ntawm kev ua kom huv ntawm impurities xws li Fe3 ntxiv thiab qhov tsis tuaj yeem tswj tau qhov loj me ntawm cov xim. Nws tsis yog txog xyoo 1930 uas anatase pigment titanium dioxide tau tsim. Txij thaum ntawd los, vim qhov kev tshawb pom tias titanium dioxide tsim cov kev ua haujlwm photochemical thaum siv cov xim, muaj tib qhov teeb meem ntawm kev ua kom cov pulverization ntawm cov ntaub ntawv tsim cov yeeb yaj kiab, yog li inorganic oxides xws li A12O3 thiab SiO2 tau maj mam siv rau kev kho deg. Vim yog txoj kev loj hlob ntawm kev kho mob saum npoo av, qhov zoo ntawm titanium dioxide tau raug txhim kho tas li, thiab muaj ntau pua hom. Txhawm rau ua kom tiav, kev kho saum npoo thiab ntau yam ntawm titanium dioxide raug cais raws li hauv qab no:
1. Universal titanium dioxide
Cov zis ntawm universal titanium dioxide tshaj 60 feem pua ntawm tag nrho cov zis ntawm titanium dioxide. Kev kho saum npoo ntawm cov khoom no feem ntau yog ua los ntawm inorganic oxides xws li AI 203, AI 20 3-SiO2 lossis A1 2O 3-SiO2-TiO2, uas suav rau 2 feem pua rau 5 feem pua ntawm tag nrho cov nyiaj. Los ntawm kev tshuaj xyuas ntawm cov khoom siv kho mob dav dav ntawm lub hom phiaj titanium dioxide, nws pom tias cov ntsiab lus ntawm T iO2 yog kwv yees li 94 feem pua, thiab tus nqi kho mob yog li ntawm 3 mus rau 5 feem pua.
2. Huab cua tsis kam titanium dioxide
Qhia tau zoo heev nyob rau hauv huab cua tsis kam, uas yog tshwj xeeb tshaj yog yuav tsum tau rau coatings rau sab nraum zoov siv. Cov tshuaj kho saum npoo uas siv rau hauv cov khoom zoo li no tseem yog cov oxides inorganic xws li A12O3, SiO2, TiO2, ZrO2, thiab cov nyiaj ntxiv yog 7% mus rau 10 feem pua. Thaum lub sij hawm txheej txheej txheej, cov oxides no tau tso rau ntawm qhov chaw ntawm TiO2 hais los tsim cov tawv nqaij zoo li cov yeeb yaj kiab, uas ua lub luag haujlwm tiv thaiv zoo tiv thaiv cov txheej txheem oxidation-txo ntawm TiO2 nto.
3. Txheej titanium dioxide nrog cov xim ntim siab
Cov xim titanium dioxide siv rau cov xim latex tiaj tus yuav tsum muaj cov spongy txheej tom qab kev kho mob, thiab tus nqi kho mob ntxiv yog 10 feem pua rau 15 feem pua. Txhawm rau ua kom cov hydrophilic kev ua tau zoo ntawm titanium dioxide zoo dua, qhov kev kho mob ntawm SiO2 feem ntau yog siab dua li ntawm Al203. Tom qab cov titanium dioxide coated nrog ib tug loj npaum li cas ntawm ntxeem tau Al2O3-SiO2 los yog txhuas silicate yog crushed mus rau hauv ib tug haum particle loj, qhov siab tshaj plaws kev pab them nqi yuav tau nyob rau hauv cov xim latex.
4. Titanium dioxide kho nrog cov organic teeb meem
Qee hom yuav tsum raug kho raws li qhov tshwj xeeb ntawm kev siv. Piv txwv li, kev kho mob nrog ib qho me me ntawm cov organic tebchaw tuaj yeem txhim kho cov dispersibility ntawm titanium dioxide. Feem ntau siv cov organic tebchaw yog polyols, polyamines thiab silicone roj. Thaum xaiv tus neeg sawv cev kho cov organic, xyuam xim rau nws cov cua sov, ruaj khov, thiab qhov chaw siv.
Kev kho deg ntawm txawv teb chaws titanium dioxide, ntxiv rau kev txuas qhov tseem ceeb rau kev kho tshuab, kuj yuav tsum muaj cov neeg ua haujlwm kho mob nruj heev. Vim yog nag lossis daus ntawm cov xim tsis huv, nws yuav cuam tshuam rau cov xim dawb ntawm titanium dioxide. Feem ntau, Fe3 ntxiv cov ntsiab lus nyob rau hauv txawv teb chaws titanium dioxide feem ntau qis dua 40PPm, thiab purity ntawm tus neeg sawv cev kho deg tseem ceeb heev.
