Cov yam ntxwv cuam tshuam rau Dispersibility ntawm Titanium Dioxide
1, Hluav taws xob tiv taus
Feem ntau nws yog ib qho nyuaj kom tsis txhob muaj ntau tus impurity ions thaum peb kho qhov chaw ntawm rutile titanium dioxide, ntawm cov anions xws li SO42+, Cl- thiab cations xws li Na+ muaj ntau. Txawm hais tias cov txheej txheem tsim khoom sib txawv los ntawm cov chaw tsim khoom mus rau cov chaw tsim khoom, lawv txhua tus muaj kev cuam tshuam tsis zoo rau cov khoom tawg ntawm cov khoom kawg.
Vim li no, nws yog ib qho tsim nyog los tshem tawm impurities los ntawm cov khoom tom qab kev kho mob saum npoo, thiab qhov ntsuas no feem ntau qhia nyob rau hauv cov nqe lus ntawm resistivity.
2, PH tus nqi ntawm qhov system
Thaum lub sij hawm npaj ntawm titanium dioxide, PH tus nqi nws tus kheej txawv heev. Kev nkag siab txog qhov cuam tshuam ntawm qhov ntsuas no ntawm kev sib cais yuav pab peb tswj hwm PH tus nqi ntawm titanium dioxide nyob rau hauv ntau qhov kev ua tau zoo thiab txhim kho qhov tawg ntawm titanium dioxide hauv cov dej hauv dej kom ntau li ntau tau.
Tus nqi PH ntawm lub kaw lus tseem yuav yog qhov tseem ceeb cuam tshuam rau kev tawg ntawm rutile titanium dioxide nyob rau hauv aqueous systems ze rau lub zoo tagnrho lub xeev, thiab lub ntsiab mechanism ntawm nws lub hwj chim tej zaum tseem yuav raug ntaus nqi mus rau ob txheej hluav taws xob.
3. Cov khoom siv tshuaj lom neeg
Hauv kev xyaum, hauv cov txheej txheem dej-raws li txheej txheem, ξ muaj peev xwm nce nrawm nrog qhov nce hauv chav tsev adsorption ntawm titanium dioxide, tab sis thaum ξ muaj peev xwm nce mus rau ib theem, qhov nce yuav qeeb qeeb. Qhov no qhia tau hais tias cov titanium dioxide hais yuav tsum ncav cuag ib tug tej yam adsorption muaj peev xwm thiaj li yuav muaj ib tug tej yam nqi stability, uas muaj kev cuam tshuam deb mus rau qhov tseeb formulation ntawm waterborne coatings.
Raws li cov khoom ntawm titanium dioxide ua finer, qhov kev faib ua feem ntawm nto atoms nce. Ntawm qhov sib txawv pH qhov tseem ceeb, cov khoom siv tshuaj lom neeg ntawm cov hmoov sib cais hauv dej yog txiav txim siab los ntawm H + thiab OH- cov khoom adsorbed rau ntawm qhov chaw.
4, Kev cuam tshuam ntawm dej-raws li txheej dispersant ntawm cov khoom ntawm titanium dioxide hmoov
Nyob rau hauv cov xwm txheej uas cov ntsiab lus ntawm titanium dioxide tseem tsis hloov, tus nqi ntawm adsorption ib chav tsev yog ncaj qha proportional rau cov ntsiab lus ntawm dispersant. Raws li DLVO txoj kev xav ntawm kev ruaj ntseg colloidal, muaj van der Waals attraction ntawm cov colloidal pawg, thiab cov huab hwm coj nyob ze rau ib leeg vim yog sib tshooj ntawm ob txheej hluav taws xob thiab cov repulsion, kev ruaj ntseg ntawm colloid nyob ntawm qhov txheeb ze ntawm qhov attraction thiab repulsion ntawm pawg neeg. Nyob rau hauv kev npaj ntawm slurry, thiaj li yuav tau ib tug heev dispersed thiab ruaj khov slurry, ib co polymer electrolytes feem ntau yog siv los txhim kho nws cov khoom ncua kev kawm ntawv.
Kev taw qhia ntawm dispersant tsub kom tus nqi ntawm ξ muaj peev xwm nyob rau hauv particle nto, uas yog vim qhov sib ntxiv ntawm dispersant, tsis zoo them anionic pawg ntawm dispersant adsorbed rau saum npoo ntawm titanium dioxide hais, ua rau tus nqi tsis zoo ntawm cov particle nto siab dua, tus nqi siab tshaj plaws nyob rau ntawm qhov chaw particle, thiab qhov siab tshaj plaws electrostatic repulsion ntawm cov khoom, yog li cov slurry muaj qhov zoo tshaj plaws dispersion. Yog li ntawd, kev npaj cov khib nyiab siab titanium dioxide slurry xaiv qhov zoo tshaj pH tus nqi yuav tsum nyob rau hauv 8 ~ 9.
5, Kev cuam tshuam ntawm cov dej-raws li txheej dispersant ntawm rheological zog ntawm titanium dioxide slurry
Cov khoom rheological ntawm kev ncua yog txiav txim siab los ntawm cov ntsiab lus ntawm cov slurry thiab kev cuam tshuam ntawm cov khoom. Titanium dioxide hmoov nyob rau hauv dej nruab nrab yog nquag mus agglomeration los yog flocculation, cuam tshuam rau stability thiab uniformity ntawm slurry. Qhov sib ntxiv ntawm dispersant tsis tsuas yog txhim kho cov yam ntxwv saum npoo ntawm cov hmoov, tab sis kuj muaj kev cuam tshuam ntau dua rau kev coj tus cwj pwm rheological ntawm titanium dioxide ncua kev kawm, los ntawm kev ntxiv cov txheej txheem dispersant tuaj yeem tau txais cov viscosity tsawg, siab stability thiab zoo uniformity ntawm txheej slurry.
Tab sis ntau dispersant, ntau tshaj dispersant molecules txuas rau ib leeg los tsim ib lub network qauv, txwv kev txav ntawm cov khoom, ua rau rheology tsis zoo.
