Cellulose ether muaj cov dej noo, uas tuaj yeem tiv thaiv cov txheej txheem ua ntej, yog li thaum kawg ua kom cov khoom siv tshuaj khib nyiab ntawm lub tshuaj khib, uas yog qhov tseem ceeb Txhawm rau nyias cov ntoo cug thiab dej-nqus cov txheej hauv lub hauv paus lossis kev sib tshuaj. Cov dej khaws cov nyhuv ethere ether tuaj yeem hloov cov txheej txheem kev tsim qauv kev tsim kho thiab txhim kho kev ua haujlwm. Piv txwv li, cov plastering kev tsim kho tuaj yeem nqa tawm ntawm cov dej-nqus cov substrates tsis muaj ua ntej ntub dej.
Lub viscosity, kev siv tshuaj viscosity, qhov kub thiab kub thiab cov qauv molecular ntawm cellulose ether muaj tus yam ntxwv zoo rau nws cov dej khaws cia. Raws li tib qho kev mob, ntau dua cov viscosity ntawm cellulose ether, qhov zoo dua cov dej rov qab tuav; Qhov siab dua qhov ntau dua, qhov zoo dua cov dej khaws cia. Feem ntau, ib qho me me ntawm cellulose ether tuaj yeem txhim kho cov dej rov qab los ntawm cug. Thaum cov koob tshuaj mus txog ib qho thaum lub sijhawm ua kom muaj dej rov qab nce, cov qauv dej ntawm cov dej khaws cia qeeb qeeb; Thaum lub caij nyoog kub nce, cov dej khaws cia ntawm cellulose feem ntau txo qis, tab sis qee cov kev ua kom haum cellulos tseem muaj cov dej ntws zoo dua; Fibers nrog txo qis theem ntawm kev hloov pauv ntawm vegan ether muaj cov dej ua kom zoo dua qub.
Cov pab pawg hydroxyl ntawm lub cellulose itherhen molecule thiab cov pa tawm rau hauv cov dej lwg me me, yog li ua ib lub luag haujlwm dawb hauv kev tuav dej; Cov dej molecule thiab lub cellulose ether molecular saw sib txuas ntxiv rau hauv cov dej hauv sab hauv thiab muaj rau cov dej ua kom ruaj khov, uas txhim kho cov dej khaws cia ntawm cov xis mas slurry; Cellulose ether txhim kho cov cement tshiab slurry. Cov yam ntxwv rheological, ntxig network qauv thiab osmotic kev tsim cov khoom ntawm cellulose ntawm cellulose ntawm dej.
Cellulose ether tshaj tawm cov tshuaj tua ntub nrog ua kom muaj kev sib xyaw ua ke ntawm cov txheej ua kom zoo nkauj ntawm lub cug. Nws yog dav siv nyob rau hauv plastering collast, Clock hauv kev tshuaj khib thiab phab ntsa sab nraud rwb thaiv tsev. Lub thickening nyhuv ntawm cellulose ether kuj tuaj yeem nce cov khoom siv los tiv thaiv cov khoom siv ua kom yooj yim, thiab tuaj yeem siv rau hauv cov pob zeb ua kom zoo nkauj, hauv qab pob zeb ua kom zoo nkauj thiab kev sib xyaw ua ke.
Lub thickening nyhuv ntawm cellulose cov ntaub ntawv ntawm cov ntaub ntawv caas yog los ntawm cov viscosity ntawm cellulose tshuaj ether. Raws li tib qho kev mob, ntau dua lub viscosity ntawm cellulose ntawm cov khoom siv viscosity, tab sis yog tias lub viscosity yog siab dhau, nws yuav cuam tshuam rau cov khoom siv flucosity thiab cov haujlwm ntawm cov khoom siv plastering ). Tus kheej-leveling cug thiab tus kheej-compacting ua pob zeb ua, uas yuav tsum tau muaj fluconity, xav tau cov visculose qis ntawm cellulose ether. Tsis tas li ntawd, cov nyhuv tuab ntawm cellulose ether yuav ua rau cov khoom siv dej kom haum thiab nce cov qoob loo ntawm cug.
Lub viscosity ntawm cellulose ntawm cellulose ntawm cellulose ntawm cov ntsiab lus: molecular hnyav ntawm cellule ether, concentration, kub, shear tus nqi thiab txoj kev xeem. Raws li tib qho kev mob, ntau dua molecular hnyav ntawm cellulose ether, ntau hom viscosity ntawm kev daws; Qhov siab dua ntawm kev xav, ntau dua cov viscosity ntawm kev daws. Thaum siv nws, kev saib xyuas yuav tsum tau coj mus kom tsis txhob noj ntau dhau thiab cuam tshuam rau kev ua tshuaj khib thiab pob zeb. Cellulose ether lub viscosity ntawm ether daws yuav txo nrog qhov nce nrog qhov nce nrog qhov nce, thiab ntau dua qhov cuam tshuam ntawm qhov kub; cellulose ether cov kua muaj feem ntau yog pseudoplastic kua nrog cov cuab yeej ntawm lub cug them yuav txo qis hauv lub zog sab nraud, uas tau txais txiaj ntsig rau cov Kev siv tshuaj khib, yog li ntawd lub tshuaj khib yuav muaj kev ua haujlwm zoo thiab cohesion tib lub sijhawm; Vim tias lub cellulose cellulose tsis yog - Newtonian txog cov kua dej, thaum cov khoom siv sim ntawm tib lub cellulose ether yuav sib txawv.
Cellulose artulose molecules tuaj yeem kho qee cov roj av ntawm cov khoom siv tshiab ntawm cov molecy ntawm cov molecular chart, yog li nce viscosity ntawm kev daws teeb meem. Cov molecular chains ntawm cellulose ether tau cuam tshuam nrog cov qauv sib tw, uas tseem yuav ua rau nws cov kev daws teeb meem muaj cov viscosity muaj aqueous muaj cov viscosity muaj aqueous muaj cov viscosity muaj aqueous muaj cov viscosity muaj aqueous muaj hom viscosity zoo.
High-viscosity cellulose ethooure kua muaj siab thixotrostropy, uas tseem yog tus yam ntxwv loj ntawm cellulose ether. Cov tshuaj aquyl ntawm methyl feem ntau muaj pseudopastic thiab qhov kub thiab txias, tab sis qhia Newton Asmeskas txaus rau tus nqi qis. Pseudoplastic nce nrog molecular hnyav lossis concentration ntawm cellulose ether, tsis hais hom kev hloov pauv thiab cov degree hloov chaw. Yog li ntawd, cellulose muaj kev hais ua neeg ntawm tib lub hom phiaj viscosity ntev li ntev tau pom tias muaj qhov siab thiab kub tu tas mus li. Cov tshuaj pleev cov qauv qauv yog tsim thaum qhov kub tau tsa, thiab muaj txiaj ntsig zoo siab tshaj plaws tshwm sim. Kev siab thiab cov viscosity cellulos cov neeg hais ua ke ua yeeb yam thixotrotropy txawm nyob hauv qab cov pa taws kub. Cov cuab yeej no yog cov txiaj ntsig zoo rau kev hloov kho ntawm leveling thiab sagging hauv kev tsim kho lub tshuab tshuaj khib. Nws yuav tsum tau piav qhia ntawm no tias qhov siab dua ntawm cellulose ntawm cov dej nyob ether ether, thiab cov kev txo qis hauv nws solubility, uas muaj qhov tsis zoo On cug tshuaj masterration thiab kev tsim kho. Qhov siab tshaj lub viscosity, qhov pom ntau ntxiv rau cov nyhuv tuab rau ntawm lub tshuaj khib, tab sis nws tsis yog tag nrho. Qee qhov nruab nrab thiab qis viscosity, tab sis hloov kho cellulose muaj kev ua tau zoo dua hauv kev txhim kho lub zog ntawm lub zog ntub. Nrog rau kev nce viscosity, cov dej khaws cia ntawm cellulose ether txhim kho.
Lub sijhawm Post: Feb-28-2023