Hauv kev npaj cug tov, tsuav yog ntev me me ether tuaj yeem txhim kho cov cellulose ether yog ib qho kev ua tau zoo ntawm kev tshuaj khib. "
Kev xaiv ntawm ntau hom, txawv viscosities, sib txawv particle, sib txawv ntawm cellulose muaj kev pab ntawm kev txhim kho ntawm cov hmoov ntawm cov hmoov av qhuav. Tam sim no muaj ntau masonry thiab plastering mortars muaj cov dej tsis zoo, thiab cov dej slurry yuav cais tom qab ob peb feeb ntawm sawv ntsug. Yog li nws yog ib qho tseem ceeb heev kom ntxiv cellulose ether hauv cement.
Dej ceev
Dej khaws cia yog ib qho kev ua tau tseem ceeb ntawm methyl cellulose ether, tshwj xeeb yog cov cheeb tsam sib xyaw nrog ntau qhov kub thiab txias, xyuam xim rau.
Hauv kev tsim cov ntaub ntawv hauv tsev, tshwj xeeb tshaj yog cov hmoov av, cellulose ua lub luag haujlwm (cug cug
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 ither molecular chart interstirus, yog li txhim kho dej hauv sab hauv, thiab txhim kho cov dej khaws cia ntawm cov xis mas slurry; Cellulose ether txhim kho cov cement tshiab ntawm cov qauv hluav taws xob, cov khoom siv osmot lossis cov yeeb yaj kiab ci ntsa iab ether tabs tab kaum diffusion ntawm dej.
thickening thiab thixotropy
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.
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.
Cua-Entraining
Cellulose ether muaj cov nyhuv huab cua pom tseeb ntawm cov khoom siv caas tshiab. Cellulose ether muaj ob pab pawg hydrophilic (cov pab pawg hydroxyl, ib pawg, cov pab pawg hydluloth), thiab yog cov kev ua haujlwm zoo nkauj), thiab yog cov kev ua si zoo nkauj), thiab yog cov haujlwm surfactant), thiab yog ib pawg neeg methyl), thiab yog ib pawg neeg methyl), thiab yog cov khoom noj muaj txiaj ntsig zoo), thiab yog cov kev ua si zoo nkauj), thiab yog cov kev ua haujlwm zoo nkauj), thiab yog cov haujlwm ua kom zoo nkauj), yog li muaj cov nyhuv cua. Cov Huab Cua-Nkag cov nyhuv ntawm cellulose cov ntaub ntawv thiab smoothness ntawm cov yas ua haujlwm ntawm lub sijhawm ua haujlwm, uas yog qhov zoo rau kev sib tov ntawm lub tshuaj khib ; Nws tseem yuav nce cov zis tawm ntawm lub tshuaj tua kab, txo cov nqi ntau lawm, Tab sis nws yuav nce poroses ntawm cov khoom tawv tawv ntawm cov khoom tawv tawv thiab txo nws cov khoom siv xws li xws li muaj zog thiab elastic maculus.
Raws li surfactant, cellulose ether tseem muaj cov nyhuv ntub lossis cov khoom siv ua ke ntawm cov nyhuv cov cua ua ke, tab sis nws cov nyhuv cua ua ke yuav txo tau cov nyhuv cua. Cov nyhuv ntawm fellity yog kev sib xyaw ntawm kev tsim kom zoo thiab ua kom tuab. Feem ntau hais lus, thaum cov ntsiab lus ntawm cellulose ether yog tsawg heev, kev ua tau zoo yog kev ziab lossis dej txo; Thaum cov ntsiab lus yog qhov siab, cov nyhuv tuab ntawm cellulose nce nrawm, thiab nws cov kev ua huab cua nrawm nroos, thiab cov phiaj xwm huab cua zoo li yuav noo. Yog li nws pom tias yog cov nyhuv tuab lossis ua kom muaj kev nce ntxiv.
rov ua
Cellulose ether yuav ntev ntev cov ntaub ntawv ntawm cov khoom siv ua kom tshiab, thiab ncua kev sib xyaw ntawm cov kab cug ua ke thiab lub sijhawm ua haujlwm kuj ua rau ncua kev tsim kho qhov kev tsim kho.
Lub Sijhawm Post: Feb-24-2023