Dispersing hydroxyethyl cellulose (HEC) yog kev ua haujlwm uas xav tau cov kauj ruam tshwj xeeb kom ua raws, tshwj xeeb tshaj yog nyob rau hauv aqueous media. Qhov tseeb dispersion thiab cov kauj ruam sib cais tuaj yeem ua kom nws siv cov nyhuv siv. Hydroxyethyl cellulose yog dav siv rau hauv cov xim txheej txheem, cov nplaum, cov tshuaj pleev ib ce thiab lwm daim duab ua kom tawv, ua yeeb yaj kiab, ua yeeb yaj kiab thiab lwm yam haujlwm.
Taw qhia rau hydroxyethyl cellulose
Hydroxyethyl cellulose yog dej-soluble tsis-ionic cellulose ionet ua los ntawm cov tshuaj kho nqaij ntawm ntuj. Nws muaj cov khoom siv sudubility zoo thiab ua kom muaj cov teebmeem, thiab tuaj yeem tsim lub pob tshab, hom arecous. Hec tseem muaj cov ntsev kom txaus, yog li nws yog qhov tshwj xeeb rau cov dej hiav txwv ib puag ncig lossis ib puag ncig dej hiav txwv lossis av. Nyob rau tib lub sijhawm, nws tuaj yeem nyob ruaj khov tshaj li qhov dav dav ntau thiab tsis cuam tshuam los ntawm acid thiab alkali ib puag ncig.
Kev Txom Nyem Cov Cai ntawm Hydroxyethyl cellulose
Hauv dej, txoj kev dispersion ntawm hydroxyethyl cellulose muaj ob kauj ruam tseem ceeb: ntub dispersion thiab ua tiav kev sib cais.
Ntub dej ... Qhov no yog cov txheej txheem ntawm kev ua hydroxyethyl cellulose hais evently faib nyob rau hauv dej. Yog tias HEC tau txuas ntxiv rau dej, nws yuav nqus dej sai thiab tsim cov nplais nplaum rau saum npoo av, uas tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab tab. Yog li ntawd, thaum lub sij hawm cov txheej txheem dispersion, tsim ntawm cov koog yuav tsum zam kom ntau li ntau tau.
Ua tiav kev sib txawv: Tom qab ntub dej, lub cellulose molecules maj diffuse rau hauv dej los ua cov tshuaj tsis zoo. Feem ntau, HEC tawm tsam maj mam thiab yuav siv sijhawm ntau teev lossis ntev ntev dua, nyob ntawm cov dej kub, txhaws cov mob thiab cellulose loj.
Cov kauj ruam dispersion ntawm hydroxyethyl cellulose
Txhawm rau kom ntseeg tau tias hydroxyethyl cellulose tuaj yeem yog tusyees dispersed, cov hauv qab no yog feem ntau siv cov kauj ruam dispersion feem ntau:
1. Xaiv cov dej xis nyob
Dej kub yog ib qho tseem ceeb cuam tshuam rau cov dispersion thiab tshem tawm ntawm hydroxyethyl cellulose. Feem ntau hais lus, dej txias txias lossis chav chav kub yog qhov chaw haum tshaj plaws ib puag ncig. Dej sov (txog 30-40 ° C) pab ua kom nrawm dua kev sib cais, tab sis cov txheej txheem siab heev (dhau 50 ° C) yuav cuam tshuam rau cov txheej txheem xaus, uas yuav cuam tshuam rau kev dispersion nyhuv.
2. Kev kho mob ua ntej
Hydroxyethyl cellulose nyhav rau daim ntawv pob zeb sai sai hauv dej, yog li ua ntej-ntub kev kho yog qhov ua tau zoo li kev rho tawm. Los ntawm thawj zaug sib xyaw Hec nrog dej-soluble organic huab cua (propylene glycol, thiab lwm yam) Hom qauv no tuaj yeem txhim kho qhov kev cuam tshuam tom ntej no.
3. Tswj Qhov Ntxiv Ceev
Thaum dispersing hydroxyethyl cellulose, cov hmoov yuav tsum tau nchuav rau hauv dej maj mam thiab tusyees thaum nplawm. Qhov ceev ntawm lub stirrer yuav tsum tsis txhob siab dhau los tiv thaiv ntau dhau ua npuas dej. Yog tias qhov kev sib ntxiv nrawm nrawm nrawm, Hec yuav tsis muaj kev tawg tag nrho, ua rau cov txheej txheem tsis sib xws, uas yuav cuam tshuam rau cov txheej txheem tom ntej.
4. Stirring
Stirring yog ib qho ntawm cov kauj ruam tseem ceeb tshaj plaws hauv kev rho tawm txheej txheem. Nws raug nquahu kom siv qhov qis-ceev stirrer mus do txuas ntxiv kom ntseeg tau tias cov cellulose cellulose muaj cai faib rau hauv cov kab ke ua kua. Kev kub ceev yuav ua rau HEC mus rau agglomerate, nce lub sijhawm ua kom tiav, thiab tsim cov npuas, cuam tshuam rau cov kev daws teeb meem. Feem ntau, lub sijhawm stirringing yuav tsum tau tswj hwm ntawm 30 feeb, nyob ntawm cov khoom siv thiab ntsuas kub ntawm cov dej.
5. Ntxiv electrolytes lossis kho pH
Qee zaum, cov txheej txheem sib cais ntawm hydroxyethyl cellulose tuaj yeem nrawm los ntawm kev ntxiv cov khoom tsim nyog ntawm electrolytes (xws li salts) lossis kho tus lej pH. Hom no yog tsim nyog rau rau cov ntawv thov uas muaj cov kev xav tau siab rau kev nthuav dav. Txawm li cas los xij, tus nqi ntawm electrolyte lossis pH yuav tsum ua tib zoo kho kom zam kom tsis txhob cuam tshuam kev ua haujlwm ntawm Hec.
Cov teeb meem thiab kev sib ntaus sib tua
Agglomeration: Feem ntau cov teeb meem ntawm HEC yog AGGLOMERY thaum lub sijhawm ua tiav, uas ua rau tsis tiav qhov kev ua tsis tiav. Txhawm rau zam qhov no, koj tuaj yeem siv cov txheej txheem ua ntej ntub lossis sib xyaw nrog lwm cov hmoov hmoov (xws li fillers, pigments, thiab tom qab ntawd ntxiv rau dej.
Qaum qeeb kawg: Yog tias muaj kev sib cais qeeb, koj tuaj yeem ua kom nrawm dua li kev sib cais los ntawm kev nce qib los ntawm kev nce qib lossis ntsuas dej kom zoo. Nyob rau tib lub sijhawm, koj kuj tseem tuaj yeem sim siv cov HEC Instant tam sim, uas tau raug tshwj xeeb kho kom yaj sai hauv lub sijhawm luv luv.
Cov teeb meem npuas: Cov npuas tau yooj yim dua thaum lub sij hawm stirring, cuam tshuam rau cov pob tshab thiab viscosity ntsuas ntawm kev daws teeb meem. Hauv qhov no, txo qhov nrawm nrawm lossis ntxiv tus nqi tsim nyog ntawm defoaming tus neeg sawv cev tuaj yeem txo cov kev tsim cov npuas.
Daim ntawv thov kev ceev faj rau hydroxyethyl cellulose
Hauv kev siv cov tswv yim, hom uas tsim nyog thiab ntxiv txoj kev ntawm hydroxyethyl cellulose yuav tsum tau xaiv raws li cov cai ntawm cov kev cai sib txawv. Piv txwv li, hauv cov txheej txheej kev lag luam, hydroxyethyl cellulose tsis yog siv los ua cov thickener, tab sis kuj tuaj yeem ua kom muaj kev ruaj ntseg thiab kev ruaj ntseg ntawm txheej. Nyob rau hauv kev lag luam roj tawm, cov ntsev tsis kam ntawm HEC yog qhov tseem ceeb heev, yog li kev xaiv yuav tsum tau hloov kho raws li cov kev mob qis.
Dispersing hydroxyethyl cellulose yog qhov kev ua haujlwm siab heev, thiab nws yog ib qho tsim nyog los xaiv cov kev rho tawm uas haum raws li cov xwm txheej sib txawv raws li daim ntawv thov sib txawv. Los ntawm kev tswj hwm cov dej kub, ua ntej ntub dej, tsim nyog stiringting thiab ntxiv cov neeg tsim nyog thiab yaj tag nrho nws cov thickening thiab ruaj khov ua haujlwm.
Lub Sijhawm Post: Kaum-23-2024