Dispersing hydroxyethyl cellulose (HEC) yog ib qho kev ua haujlwm uas yuav tsum tau ua raws cov kauj ruam tshwj xeeb, tshwj xeeb tshaj yog nyob rau hauv aqueous media. Qhov tseeb dispersion thiab dissolution cov kauj ruam tuaj yeem ua kom nws siv tau. Hydroxyethyl cellulose yog dav siv nyob rau hauv coatings, adhesives, tshuaj pleev ib ce, roj teb thiab lwm yam teb vim nws thickening, stabilization, film-forming, moisturizing thiab lwm yam dej num.
Taw qhia rau Hydroxyethyl Cellulose
Hydroxyethyl cellulose yog cov dej-soluble uas tsis yog-ionic cellulose ether ua los ntawm cov tshuaj hloov kho ntawm ntuj cellulose. Nws muaj cov txiaj ntsig zoo solubility thiab thickening, thiab tuaj yeem tsim cov pob tshab, kua dej khov. HEC kuj muaj cov dej ntsev zoo heev, yog li nws yog qhov tshwj xeeb tshaj yog tsim rau cov dej hiav txwv ib puag ncig lossis cov dej ntsev. Nyob rau tib lub sijhawm, nws tuaj yeem nyob ruaj khov tshaj pH ntau yam thiab tsis cuam tshuam los ntawm acid thiab alkali ib puag ncig.
Dispersion txoj cai ntawm hydroxyethyl cellulose
Hauv dej, cov txheej txheem dispersion ntawm hydroxyethyl cellulose suav nrog ob kauj ruam tseem ceeb: ntub dej dispersion thiab ua tiav kev tawg.
Kev ntub dej: Qhov no yog cov txheej txheem ntawm kev ua cov hydroxyethyl cellulose hais sib npaug hauv dej. Yog tias HEC ntxiv ncaj qha rau hauv dej, nws yuav nqus dej sai sai thiab tsim cov nplaum nplaum rau ntawm qhov chaw, uas cuam tshuam rau kev sib cais ntxiv. Yog li ntawd, thaum lub sij hawm dispersion txheej txheem, tsim ntawm xws li clumps yuav tsum tau zam kom ntau li ntau tau.
Kev ua kom tiav: Tom qab ntub dej, cov cellulose molecules maj mam diffuse rau hauv dej los tsim ib qho kev daws teeb meem. Feem ntau, HEC dissolves maj mam thiab yuav siv sij hawm ob peb teev lossis ntev dua, nyob ntawm qhov kub ntawm cov dej, nplawm cov xwm txheej thiab cellulose particle loj.
Dispersion cov kauj ruam ntawm hydroxyethyl cellulose
Txhawm rau kom ntseeg tau tias hydroxyethyl cellulose tuaj yeem sib npaug sib npaug, cov hauv qab no feem ntau siv cov kauj ruam dispersion:
1. Xaiv qhov dej kub zoo
Dej kub yog ib qho tseem ceeb cuam tshuam rau dispersion thiab dissolution ntawm hydroxyethyl cellulose. Feem ntau hais lus, dej txias los yog dej kub hauv chav tsev yog qhov tsim nyog tshaj plaws kev sib cais ib puag ncig. Cov dej sov (kwv yees li 30-40 ° C) pab kom nrawm nrawm, tab sis dej kub dhau (tshaj 50 ° C) yuav ua rau cov pob zeb tsim thaum lub sij hawm dissolution, uas yuav cuam tshuam rau cov nyhuv dispersion.
2. Kev kho mob ua ntej wetting
Hydroxyethyl cellulose nyhav tsim clumps sai sai hauv dej, yog li kev kho pre-wetting yog ib txoj kev zoo dispersion. Los ntawm thawj zaug sib xyaw HEC nrog cov dej-soluble organic hnyav (xws li ethanol, propylene glycol, thiab lwm yam), HEC yog uniformly wetted los tiv thaiv nws los ntawm ncaj qha absorbing dej thiab tsim lumps. Txoj kev no tuaj yeem txhim kho qhov ua tau zoo tom qab dispersion.
3. Tswj qhov ceev ntxiv
Thaum dispersing hydroxyethyl cellulose, cov hmoov yuav tsum tau nchuav rau hauv dej maj mam thiab sib npaug thaum nplawm. Qhov ceev ntawm lub stirrer yuav tsum tsis txhob siab dhau los tiv thaiv ntau foaming. Yog tias qhov sib ntxiv ceev nrawm dhau, HEC yuav tsis tawg tag nrho, tsim cov micelles tsis sib xws, uas yuav cuam tshuam rau cov txheej txheem tom ntej.
4. Sib tov
Stirring yog ib qho ntawm cov kauj ruam tseem ceeb tshaj plaws hauv cov txheej txheem dispersion. Nws raug nquahu kom siv cov stirrer qis qis kom ua kom tsis tu ncua kom ntseeg tau tias cov hydroxyethyl cellulose tuaj yeem sib npaug sib npaug thoob plaws hauv cov kua dej. Kev kub ceev stirring yuav ua rau HEC agglomerate, nce lub sij hawm dissolution, thiab tsim npuas, cuam tshuam cov pob tshab ntawm cov tshuaj. Feem ntau, lub sij hawm stirring yuav tsum tau tswj ntawm 30 feeb thiab ob peb teev, nyob ntawm seb cov khoom siv thiab qhov kub ntawm cov dej.
5. Ntxiv electrolytes los yog kho pH
Qee lub sij hawm, cov txheej txheem tawg ntawm hydroxyethyl cellulose tuaj yeem ua kom nrawm dua los ntawm kev ntxiv cov khoom siv hluav taws xob tsim nyog (xws li ntsev) lossis kho tus nqi pH. Txoj kev no yog qhov tshwj xeeb tshaj yog rau cov ntawv thov uas muaj cov kev xav tau siab rau kev sib cais ceev. Txawm li cas los xij, tus nqi ntawm electrolyte lossis pH yuav tsum tau ua tib zoo kho kom tsis txhob cuam tshuam rau kev ua haujlwm ntawm HEC.
Cov Teeb Meem Zoo thiab Kev Tiv Thaiv
Agglomeration: Qhov teeb meem feem ntau ntawm HEC yog agglomeration thaum lub sij hawm dissolution txheej txheem, uas ua rau dissolution tsis tiav. Txhawm rau zam qhov no, koj tuaj yeem siv cov txheej txheem ua ntej ntub dej lossis sib tov HEC nrog lwm cov ntaub ntawv hmoov (xws li cov khoom ntim, pigments, thiab lwm yam) thiab tom qab ntawd ntxiv rau dej.
Tsawg dissolution tus nqi: Yog hais tias tus nqi dissolution qeeb, koj tuaj yeem ua kom qhov kev sib cais los ntawm kev ua kom lub zog ua kom zoo los yog tsim kom muaj qhov kub thiab txias. Tib lub sijhawm, koj tuaj yeem sim siv tam sim HEC, uas tau tshwj xeeb kho kom yaj sai sai hauv lub sijhawm luv.
Npuas teeb meem: Npuas tau yooj yim tsim thaum lub sij hawm nplawm, cuam tshuam rau cov pob tshab thiab viscosity ntsuas ntawm cov tshuaj. Nyob rau hauv cov ntaub ntawv no, txo cov stirring ceev los yog ntxiv ib tug tsim nyog tus nqi ntawm defoaming tus neeg saib xyuas yuav zoo txo qhov tsim ntawm npuas.
Daim ntawv thov ceev faj rau hydroxyethyl cellulose
Hauv kev siv tswv yim, hom tsim nyog thiab cov txheej txheem ntxiv ntawm hydroxyethyl cellulose yuav tsum raug xaiv raws li cov kev xav tau ntawm cov tshuab sib txawv. Piv txwv li, nyob rau hauv kev lag luam coatings, hydroxyethyl cellulose tsis yog tsuas yog siv raws li ib tug thickener, tab sis kuj yuav txhim kho lub rheology, zaj duab xis tsim thiab cia stability ntawm lub txheej. Hauv kev lag luam roj av, cov ntsev tsis kam ntawm HEC yog qhov tseem ceeb heev, yog li kev xaiv yuav tsum tau hloov kho raws li qhov chaw downhole.
Dispersing hydroxyethyl cellulose yog ib qho kev lag luam zoo heev, thiab nws yog ib qho tsim nyog yuav tau xaiv txoj kev dispersion tsim nyog raws li qhov kev thov sib txawv. Los ntawm kev tswj cov dej kub, ua ntej-wetting, tsim nyog stirring thiab ntxiv cov additives tsim nyog, nws muaj peev xwm xyuas kom meej tias hydroxyethyl cellulose yog tusyees dispersed thiab tag yaj nyob rau hauv dej, li no maximizing nws thickening thiab stabilizing zog.
Post lub sij hawm: Oct-23-2024