Inorganic Txheej ntawm Huab Cua TiO2
Titanium dioxide yog cov xim dawb nrog kev ua tau zoo tshaj plaws, lub npe hu ua "tus huab tais ntawm cov xim dawb", thiab yog siv dav hauv cov xim, xim, yas, inks, tshuaj fibers, roj hmab thiab lwm yam lag luam. Txawm li cas los xij, cov xim tsis kho titanium dioxide muaj kev ua haujlwm photochemical, thiab nyob rau hauv lub teeb pom kev, tshwj xeeb tshaj yog nyob rau hauv ultraviolet irradiation, nws muaj peev xwm degrade cov organic teeb meem nyob ib puag ncig, thiab nws yog ib qho yooj yim los tsim lub teeb poob, yellowing, chalking thiab lwm yam tshwm sim, yog li huab cua tsis kam. ib qho tseem ceeb heev daim ntawv thov Performance index ntawm titanium dioxide. Yog li ntawd, nws yog ib qho tseem ceeb heev los kawm txog kev kho saum npoo ntawm titanium dioxide los txhim kho qhov zoo ntawm titanium dioxide thiab npaj cov nqi ntxiv rau titanium dioxide.
Txhawm rau txhim kho huab cua tsis kam ntawm titanium dioxide pigments, titanium dioxide feem ntau yog kho nrog cov txheej txheem inorganic kom cais cov titanium dioxide los ntawm ib puag ncig cov organic teeb meem los txhim kho nws cov huab cua tiv thaiv thiab tawg. Ua ntej txheej txheej, cov titanium dioxide yuav tsum tau tawg mus rau hauv dej, kom cov khoom yuav tsum tau qhwv tuaj yeem ncav cuag qhov zoo tshaj plaws dispersion lub xeev, thiab muaj qhov haum tshaj plaws viscosity, thiaj li hais tias ib tug ua tiav zaj duab xis txheej yuav precipitated rau saum npoo ntawm txhua particle. , thiab cov dispersant ntxiv rau titanium dioxide slurry tuaj yeem txhim kho cov nyhuv dispersion ntawm titanium dioxide.
Cov txheej txheem kev npaj ntawm huab cua-resistant titanium dioxide yog raws li nram no: crude rutile titanium dioxide uas tau crushed mus rau ib tug tej yam fineness (tsawg tshaj li 0.15% ntawm cov residue ntawm 45μm sieve) yog ntxiv rau dej, dispersants xws li sodium hexametaphosphate thiab sodium silicate yog ntxiv, thiab tus nqi pH raug kho los ntawm caustic soda 9 ~ 11. Cov slurry saum toj no yog hauv av nrog xuab zeb zeb kom disperse cov titanium dioxide hais uas yog pawg ua ke, thiab ces nkag mus rau hauv cov khoom txheej kom sov cov slurry saum toj no rau ib tug tej yam kub. Nyob rau hauv cov xwm txheej zoo nplawm, tus neeg sawv cev txheej yog ntxiv los kho cov pH tus nqi ntawm lub cev, yog li cov txheej txheem txheej tau muab tso rau saum npoo ntawm titanium dioxide. Thiab kho tau rau ib lub sijhawm, ib txheej ntawm inorganic txheej ntawm titanium dioxide tiav. Yog hais tias ob peb txheej ntawm inorganic oxides yuav tsum tau coated, lub slurry kub thiab pH tus nqi raug kho dua, thiab cov khoom thib ob yog ntxiv rau txheej.
Tom qab qhov saum npoo ntawm titanium dioxide yog coated nrog inorganic oxide tiv thaiv zaj duab xis, nws cov khoom nto tau hloov pauv, tsis tsuas yog nrog cov khoom tshiab saum npoo av, tab sis kuj muaj cov khoom tshiab ntawm lub cev thiab tshuaj.
Cov txheej txheem inorganic siv rau huab cua-resistant titanium dioxide feem ntau yog txhuas thiab silicon. Cov txheej txheem txheej txheej saum npoo tuaj yeem muab faib ua peb hom hauv qab no:
1. Silica txheej;
2. Aluminium oxide txheej;
3. Silicon-aluminium composite txheej
