Raws li lub viscosity ntawm cov dej-raws li tsawg heev, nws tsis tuaj yeem ua tau zoo ntawm cov ntaub ntawv xaim, yog li nws yog qhov tsim nyog yuav tsum tau siv cov ntaub tuab ntawm cov dej kom haum rau lub xeev kom raug.
Muaj ntau ntau yam ntawm thickeners. Thaum xaiv cov thickeners, ntxiv rau lawv cov tuab tuab ntawm cov xim rheology, qee qhov kev tsim kho zoo tshaj plaws, lub neej ua haujlwm ntev tshaj plaws.
Kev xaiv ntawm cov tuab tuab yog tsuas yog raws li qhov xav tau thiab qhov xwm txheej tiag tiag ntawm cov qauv.
Thaum xaiv thiab siv cov thickeners, cov no yog qhov tseem ceeb.
1. Cov roj hnyav hnyav HEC muaj qib siab dua ntawm kev ua haujlwm tsawg dua thiab cov khoom ua kom zoo dua thaum muaj kev cia siab. Thiab thaum tus nqi shear ntxiv, lub winding lub xeev raug rhuav tshem, tus nqi shear, cov nyhuv me me ntawm viscosity. Qhov no thickening txheej txheem tsis muaj dab tsi ua rau cov khoom siv hauv paus, cov pigecents thiab kev hloov kho cov cellulose thiab ntxiv rau cov viscosity zoo, thiab yog li dav siv.
2.HEUR thickenter yog cov tshuaj pleev axous nrog Diol lossis Diol Etaws raws li cov ntsiab lus ntawm 20% ~ 40%. Lub luag haujlwm ntawm Co-hnyav yog txhawm rau inhibit lub adhesion, txwv tsis pub cov thickeners no nyob hauv cov gel lub xeev ntawm tib lub ntsiab lus. Nyob rau tib lub sijhawm, muaj cov kuab tshuaj tuaj yeem zam cov khoom lag luam los ntawm khov, tab sis nws yuav tsum ua kom sov nyob rau lub caij ntuj no ua ntej siv.
3. Cov khoom lag luam qis, cov khoom lag luam tsawg yog yooj yim pov tseg thiab tuaj yeem thauj khoom thiab khaws cia thiab khaws cia hauv ntau. Yog li ntawd, qee cov heur thickeners muaj cov ntsiab lus sib txawv ntawm tib cov khoom lag luam. Cov ntsiab lus co-salvent ntawm cov viscosity qis dua, thiab nruab nrab-shear viscosity ntawm kev txo cov co-solvent ntxiv lwm qhov hauv cov qauv.
4. Nyob rau hauv txoj kev sib xyaw ua ke, tsawg-viscoity heur tuaj yeem ntxiv mus ncaj qha rau cov xim yas. Thaum siv cov khoom viscosity siab, cov tuab tuab yuav tsum tau diluted nrog kev sib xyaw ntawm dej thiab co-cament ua ntej nws tuaj yeem ntxiv. Yog tias koj ntxiv dej rau dilute lub thickener ncaj qha, nws yuav txo cov kev xav ntawm cov khoom lag luam qub hauv cov khoom lag luam, uas yuav ua rau cov adhesion thiab ua rau viscosity kom sawv.
5. Ntxiv cov tuab rau cov kev sib xyaw ua ke rau lub tank yuav tsum khov kho thiab qeeb, thiab yuav tsum muab tso ua ke ntawm phab ntsa phab ntsa. Qhov kev nrawm ntawm kev ntxiv yuav tsum tsis txhob nrawm nrawm ntawm cov kua ntawm cov kua, tab sis yuav tsum tau rub tawm hauv cov kua thiab muab cov thickener yuav tsis sib xyaw zoo dua los yog cov tuab tuab heev lossis flocculated vim yog qhov kev xav hauv zos siab.
6. Heur thickener ntxiv rau cov xim sib xyaw tank tom qab lwm cov kua cov kua thiab ua ntej emulsion, yog li kom ntseeg tau ntau qhov zoo tshaj plaws.
7. Nws tuaj yeem raug ntxiv raws li qhov kawg hauv cov theem sib xyaw, hauv cov xim thaib dispersion theem, lossis raws li thawj zaug hauv kev sib xyaw.
8. Vim tias muaj wase yog lub acid siab emulsion, tom qab ntxiv, yog tias muaj alkali hauv cov xim emulsion, nws yuav sib tw rau cov alkali. Yog li ntawd, nws yuav tsum tau ntxiv cov wase thickener emulsion, thiab emulsion binder lub hauv paus tsis muaj zog, thiab tom kawg yog nyob ruaj khov los ntawm pawg ntawm cov thoob ntiaj teb.
9. Alkali tuaj yeem ntxiv ua ntej lossis tom qab tus neeg sawv cev tuab ntxiv. Qhov kom zoo dua ntawm kev ntxiv ua ntej yog kom ntseeg tau tias tsis muaj qhov tsis muaj peev xwm ntawm cov xim xim los yog emulsion blection) yuav tshwm sim los ntawm lub thinener thawb alkali los ntawm cov xim los ntawm cov xim lossis phau ntawv. Qhov zoo dua ntawm kev ntxiv cov alkali tom qab yog tias cov tuab tuab tau tawg ua ntej lawv o agglomeration, nyob ntawm cov qauv, cov txheej txheem tsim qauv. Txoj kev nyab xeeb tshaj plaws yog kom dilute lub wasque thickener nrog dej ua ntej thiab ces neutralize nws nrog alkali ua ntej.
10. Has thickener pib mus rau o ntawm ntev txog 6, thiab cov tuab tuab yuav ua kom tiav cov xim hauv qab 8 tuaj yeem khaws cov duab x ntawm latx los ntawm tsawg dua 8 , yog li ua kom muaj kev ruaj ntseg ntawm viscosity.
Lub sij hawm Post: Lub Yim Hli 05-2022