1. Cov ntsiab lus ntawm methyl hydrothethyl cellulose (MHEC)
Methyl Hydrotyl cellulose (MHEC) yog cov tsis muaj ionic cellulose kev hloov kho ntawm methylation raws li hydrothethyl cellulose. Vim nws cov qauv molecular, MHEC muaj kev ua si zoo, cov khoom siv roj nplaum, ua yeeb yaj kiab, cov khoom siv tsev, tshuaj txhua hnub thiab lwm thaj teb.
2. Kev ntsuas ntawm cov xim pleev xim
Cov kab mob xim yog cov tshuaj npaj siv los tshem tawm cov txheej txheem saum npoo av xws li hlau, ntoo, thiab plastics. Tsoos xim khau khiab feem ntau cia siab rau cov kuab tshuaj hnyav, xws li Dichhloromethane thiab Toluene. Txawm hais tias cov tshuaj no ua tau zoo, lawv muaj teeb meem xws li muaj kev kub siab xws li kev nyab xeeb thiab kev nyab xeeb ib puag ncig. Nrog rau cov kev cai tswj hwm ib puag ncig ib puag ncig thiab kev txhim kho ib puag ncig ua haujlwm, dej raws li dej thiab cov khoom lag luam tsawg.
3. Mechanism ntawm Kev Ua ntawm MHEC hauv Cov Khoom Siv Xim
Nyob rau hauv cov kab pleev xim, MHEC ua lub luag haujlwm tseem ceeb ua cov tuab tuab thiab rheology kho dua tshiab:
Thickening cov nyhuv:
MHEC muaj cov nyhuv zoo rau hauv cov tshuab dej. Los ntawm kev kho cov viscosity ntawm cov xim av stripcosity, MHEC tuaj yeem ua rau cov xim stripper nyob rau ntsug lossis inclined thaj chaw yam tsis muaj sagging. Cov cuab yeej no yog ib qho tshwj xeeb tshaj yog thaum lub sijhawm pleev xim rau lub hom phiaj xim rau lub sijhawm ntev dua, yog li kev txhim kho cov xim stripping cov txiaj ntsig.
Ruaj khov cov txheej txheem tshem tawm:
Cov kab pleev xim feem ntau muaj ntau cov khoom xyaw nquag, uas yuav ua rau lossis txiav txim thaum lub sijhawm cia. Los ntawm kev txhim kho cov qauv viscosity ntawm kev daws teeb meem, MHEC tuaj yeem tiv thaiv kev ua kom sib luag, thiab xyuas kom meej cov kev ua tau zoo ntawm cov xim txheej txheem.
Kho Rheological Khoom:
Kev siv cov kab pleev xim yuav tsum tau hais tias nws muaj cov khoom muaj kuab zoo, nws tuaj yeem ntws tawm sai thaum lub zog quab yuam, tab sis tuaj yeem tuab sai sai thaum tsis meej. Cov molecular saw qauv ntawm MHEC muab nws zoo shear hle cov khoom, uas yog, ntawm cov kev daws teeb meem siab, ua rau cov xim sib txawv yooj yim rau kev thov; Thaum lub sij hawm qis qis tus nqi lossis hauv lub xeev zoo li qub, kev daws viscosity yog qhov siab, uas pab cov khoom siv sib txuam ntawm lub hom phiaj nto.
Txhawb zaj duab xis:
Thaum lub sij hawm cov xim tha xim stripping, MHEC tuaj yeem pab cov xim stripper ua cov yeeb yaj kiab tsis zoo ntawm lub hom phiaj nto. Zaj yeeb yaj kiab no tsis tuaj yeem tsuas yog lub sijhawm ntev ntawm cov khoom xyaw nquag, tab sis kuj txhim kho txoj kev npog npog rau qee yam, kom nws tuaj yeem nkag mus rau txhua qhov ntawm txheej.
4. Yuav ua li cas siv MHEC hauv cov xim pleev xim
Kev npaj ntawm aqueous daws:
MHEC feem ntau muaj nyob rau hauv cov hmoov hmoov thiab yuav tsum tau npaj rau cov tshuaj aqueous ua ntej siv. Kev xyaum dav dav yog maj mam ntxiv mHEC rau cov dej ntws kom tsis txhob agglomeration. Nws yuav tsum raug sau tseg tias solubility ntawm MHEC yuav cuam tshuam los ntawm dej kub thiab PH tus nqi. Cov dej kub siab dua (50-60 ℃) tuaj yeem nrawm dua cov txheej txheem ntawm MHEC, tab sis kub siab dhau yuav cuam tshuam nws viscosity kev ua tau zoo.
Sib xyaw rau hauv cov txheej txheem xim:
Thaum npaj cov kab mob xim av, MHEC AQUEOE txog cov tshuaj aque feem ntau yog maj mam ntxiv ntxiv rau cov xim txheej txheem sib tw ua kua hauv qab. Txhawm rau kom ntseeg tau tias muaj kev sib cais ua ke, kev sib ntxiv ntawm kev nrawm yuav tsum tsis txhob nrawm dua, thiab nplawm yuav tsum txuas ntxiv mus kom txog thaum muaj kev daws teeb meem. Tus txheej txheem no yuav tsum tau tswj lub nrawm rau kev tiv thaiv kev tsim cov npuas.
Kev kho cov mis:
Tus nqi ntawm MHEC hauv cov kab pleev xim feem ntau yog kho raws li cov mis thiab hom phiaj kev ua tau zoo ntawm cov kab pleev xim. Tus nqi sib ntxiv ib zaug yog nyob nruab nrab ntawm 0.1% -1%. Cov nyhuv muaj zog heev yuav ua rau cov xim tsis sib xws thiab cov khoom siv tsis txaus, yog li nws yog qhov tsim nyog los ua kom zoo rau nws cov kev sim.
5. Qhov zoo ntawm MHEC hauv cov kab pleev xim
Kev tiv thaiv kev nyab xeeb thiab ib puag ncig:
Piv nrog tsoos thickeners tsoos, mHEC yog cov tsis muaj ionic cellulose, tsis muaj tshuaj lom thiab muaj kev nyab xeeb, thiab muaj txoj kab nrog kev txhim kho ntawm cov kev kawm ntsuab tshiab.
Kev ruaj khov zoo heev hauv kev siv hluav taws xob ntau (PHQUAL BAL LAWV (PHT2), tuaj yeem tswj hwm ruaj khov rau lwm yam hauv lub system.
Kev sib xyaw zoo: Vim tsis muaj-ionic xwm ntawm MHEC, nws tau sib cuam tshuam nrog ntau yam tsis muaj zog, thiab haum rau ntau hom xim stripper formulations.
Ua tau zoo heev rau cov nyhuv tuab: MHEC tuaj yeem muab cov nyhuv tuab tuab, yog le caag cov tuab tuab nyob rua cov qau pleev xim, piv rau cov nqi.
Methyl hydrotyl cellulose (MHEC) tau siv dav hauv cov kab mob xim tam sim ntawd vim nws cov tuab heev, ruaj khov thiab sib xws. Los ntawm cov qauv tsim tsim tsim nyog thiab siv, MHEC tuaj yeem txhim kho kev ua tau zoo ntawm cov kab pleev xim thiab kev tiv thaiv ib puag ncig hauv kev siv cov kev siv. Nyob rau hauv lub neej yav tom ntej, nrog kev txhim kho cov xim sib txuas thiab kev txhim kho ntxiv ntawm cov kev tiv thaiv ib puag ncig, yuav tsum tau txais cov kev tiv thaiv MHEC hauv cov xim pleev xim.
Lub Sijhawm Post: Jun-14-2024