HEC (Hydroxyethyl cellulose) yog ib qho tuab tuab thiab emulsifier stabilizer, emulsions, thiab lwm yam, kws tshuaj thiab lwm thaj teb.
1. Kev npaj
Ua ntej koj pib npaj hec daws, nco ntsoov tias koj tau npaj cov ntaub ntawv hauv qab no thiab cov cuab yeej:
HEC Hmoov (Cov lag luam muaj HEC cov lus qhia feem ntau feem ntau muaj cov khoom viscosity sib txawv, thiab cov khoom tsim nyog yuav tsum tau raug xaiv raws li daim ntawv thov tshwj xeeb)
Cov kuab tshuaj (feem ntau cov dej ntshiab, dej nyab lossis lwm yam kuab tshuaj tsim nyog siv)
Stirring ntaus ntawv (sib nqus Stirrer lossis tshuab quab yuam ua kua)
Kev tswj qhov kub (xws li dej da dej)
Cov thawv ntim (iav los yog yas stirring nrog cov ntim txaus)
Precision hauv hluav taws xob nplai (rau qhov tseeb uas muaj hec hmoov)
2. Cov theem pib rau cov kev npaj daws teeb meem
2.1 Xaiv cov kuab tshuaj
HEC muaj cov solubility zoo hauv dej, tab sis txhawm rau tiv thaiv kev faib tawm agglomeration lossis tsis txawv txav thaum sib cais, kev txiav txim siab ntxiv thiab ua kom zoo dua. Cov dej deionized feem ntau yog siv los ua cov kuab tshuaj. Yog tias koj xav tau los npaj ib qho kev daws teeb meem organic hi, koj yuav tsum xaiv cov kuab tshuaj uas tsim nyog (xws li cov tshuaj sib xyaw ntawm ethanol thiab dej).
2.2 Dej Cua Sov
Qhov kev cais ntawm HEC muaj feem xyuam rau cov dej kub. Txhawm rau ua kom nrawm dua qhov kev tshem tawm ntawm HEC, dej sov (txog 50 ° C) feem ntau yog siv, tab sis tsis yog siab kom zam dhau kev ua haujlwm ntawm Hec. Tso dej deionized rau hauv lub ntim, pib ua cua sov, thiab kho kom haum kub (40-50 ° C).
2.3 Stirring Sadeadily
Thaum dej yog cua sov, pib plhaw. Lub stirring ntaus tuaj yeem yog lub stirrer sib nqus lossis cov neeg siv khoom siv. Ib qho kev ntsuas nruj me ntsis yuav tsum tau tswj kom tsis txhob muaj kev tswj kom tsis txhob muaj dej ntau dhau los thaum ua kom sib xyaw ua ke.
2.4 Maj mam ntxiv rau HEC hmoov
Thaum cov dej yog rhuab rau 40-50 ° C, pib maj mam ntxiv ntxiv hec hmoov. Txhawm rau kom tsis txhob hmoov agglomeration, nws yuav tsum yog sprinkled maj mam thaum nplawm. Cov hau kev hauv qab no tuaj yeem siv los txhim kho cov nyhuv dispersion:
Ntxiv rau hauv Batches: tsis txhob ncuav tag nrho ib zaug, koj tuaj yeem ntxiv rau hauv cov nyiaj me me, thiab tos kom txog thaum cov hmoov loj dua tom qab ntxiv lwm zaus.
Sieve: txau cov hmoov hec los ntawm sab cib rau hauv dej los pab txo cov agglomeration ntawm hmoov.
Kho cov kev nrawm tiv thaiv: thaum txia cov hmoov, kho lub zog nrawm nrawm, uas yog qhov ua rau muaj kev nthuav dav thiab kev sib cais ntawm cellulose molecules.
2.5 Txuas ntxiv nplawm kom txog thaum yaj tag
Kev sib cais ntawm HEC yog qib zuj zus. Raws li cov hmoov dispersed thiab yaj, txoj kev daws teeb meem yuav maj mam thicken. Yuav kom ntseeg tau tias HEC yog tag nrho cov lus, ua kom nplawm li 1-2 teev, thiab lub sijhawm tshwj xeeb nyob ntawm kev daws teeb meem thiab cov nyiaj ntawm HEC. Yog Lumps tshwm sim hauv kev daws teeb meem lossis kev daws teeb meem tsis ncaj, lub sijhawm stirringring tau txuas ntxiv lossis dej kub tau nce siab dua 50 ° C.
2.6 CUA TXIAS
Thaum HEc yog rhuav tshem, nres cua sov thiab txuas ntxiv nplawm, thiab cia cov tshuaj maj mam txias rau chav sov. Thaum lub sij hawm txias txheej txheem, lub viscosity ntawm kev daws teeb meem yuav txuas ntxiv mus kom txog thaum nws ncav cuag lub xeev ruaj khov.
3. Kho cov concentration ntawm kev daws teeb meem
Cov concentration ntawm HEC kev daws teeb meem feem ntau yog kho raws li daim ntawv thov tshwj xeeb. Cov kev siv kev daws teeb meem ntau zaus yog 0.5% ~ 5%, thiab tus nqi tshwj xeeb tau txiav txim siab raws li cov nyhuv tuab. Cov hauv qab no yog cov qauv rau kev suav qhov yuav tsum tau muaj ntawm
HEC:
Tus nqi ntawm HEC (G) = ntim ntawm kev daws teeb meem (ml) × yuav tsum muaj kev xav (%)
Piv txwv li, yog tias koj xav tau npaj 1000mL ntawm 1% kev daws teeb meem, koj xav tau 10G ntawm Hec hmoov.
Yog tias viscosity ntawm kev daws teeb meem dhau dhau lossis qis dhau tom qab kev npaj, koj tuaj yeem kho nws los ntawm cov hauv qab no:
Thickening: Yog tias cov viscosity tsis txaus, ntxiv me ntsis ntawm hec hmoov. Ua tib zoo xav ntxiv nws hauv cov pob txha kom tsis txhob agglomeration.
Dilution: If the viscosity of the solution is too high, add deionized water to dilute it appropriately.
4. Kev hais txog kev sib xyaw
Txhawm rau kom muaj kev sib txawv thiab kev coj dawb huv ntawm qhov kev daws zaum kawg, nws tuaj yeem lim los ntawm ib sab lossis lim ntawv. Kev lim dej tuaj yeem tshem tawm cov khoom siv tsis tau nyiaj lossis tsis txaus ntseeg, tshwj xeeb tshaj yog nyob rau hauv cov ntawv thov xav tau (xws li cov tshuaj lossis tshuaj pleev ib ce).
5. Kev khaws cia thiab cia
Qhov npaj HEC yuav tsum tau muab ntim rau kom tiv thaiv kom txhob muaj kuab paug thiab paug. Nws raug nquahu kom khaws nws rau hauv qhov chaw txias thiab qhuav kom deb ntawm lub hnub ci ncaj qha. Yog tias txoj kev daws tau khaws cia tau ntev, cov me me yuav tshwm sim. Nws raug nquahu kom ntxiv cov nyiaj tsim nyog (xws li phenoxyethanol, methylisothiazoline, thiab lwm yam) raws li xav tau.
6. Kev ceev faj
Zam txhob agglomeration: HEC hmoov yog heev yooj yim rau agglomerate hauv dej, tshwj xeeb tshaj yog thaum ntxiv dhau nrawm lossis nplawm tsis txaus. Nws raug nquahu kom siv txoj kev ntawm kev ntxiv hauv cov batches thiab kho lub ntsej muag ua kom pom tseeb kom ntseeg tau tias cov hmoov tau tawg.
Viscosity ntsuas: Yog tias tsim nyog, lub viscosity ntawm kev daws teeb meem yuav siv cov khoom siv viscemeter kom ntseeg tau tias nws yuav tsum tau ua raws li cov cai thov.
Kev khaws cia: Yog tias txoj kev daws teeb meem hEC tau khaws cia ntev, ntxiv rau kev ua kom muaj cov tshuaj tiv thaiv kab mob hauv cov kab mob me me hauv kev daws teeb meem thiab ua rau kev daws teeb meem rau kev tsis txaus ntseeg.
Tus yuam sij rau kev daws teeb meem yog tswj hwm qhov ntsuas kub, nplawm cov qauv ntawm hec kom paub meej tias qhov Hec tuaj yeem ua tau covyees tawg thiab yaj tag. Agglomeration yuav tsum tiv thaiv thaum lub ntsiab lus xaus, thiab qhov zoo ntawm kev daws teeb meem tuaj yeem txhim kho los ntawm kev lim yog tsim nyog. Tom qab mastering cov kev qhia no, koj tuaj yeem npaj kev pab cuam hec ua tiav tiav uas tau raws li koj cov kev xav tau thiab siv rau ntau yam khoom siv thiab cov khoom lag luam txhua hnub.
Lub Sijhawm Post: Feb-17-2025