01. Cov khoom ntawm sodium carboxymethylcellulose
Sodium carboxymethyl cellulose yog anionic polymer electrolyte. Cov degree ntawm kev hloov pauv ntawm kev lag luam CMC thaj tsam ntawm 0.4 txog 1.2. Nyob ntawm qhov purity, qhov tsos yog dawb los yog tawm-dawb hmoov.
1. Lub viscosity ntawm cov tshuaj
Lub viscosity ntawm CMC aqueous tov nce sai nrog qhov nce ntawm concentration, thiab cov tshuaj muaj pseudoplastic flow yam ntxwv. Cov kev daws teeb meem nrog rau qib qis ntawm kev hloov pauv (DS = 0.4-0.7) feem ntau muaj thixotropy, thiab qhov pom tseeb viscosity yuav hloov thaum shear yog siv los yog tshem tawm mus rau cov tshuaj. Lub viscosity ntawm CMC aqueous tov txo nrog nce kub, thiab cov nyhuv no yog thim rov qab thaum qhov kub tsis tshaj 50 ° C. Thaum kub siab dua rau lub sijhawm ntev, CMC yuav degrade. Qhov no yog vim li cas vim li cas cov ntshav glaze yog yooj yim tig dawb thiab deteriorate thaum luam ntawv nyias kab qauv los ntshav glaze.
CMC siv rau glaze yuav tsum xaiv cov khoom uas muaj kev hloov pauv siab, tshwj xeeb tshaj yog los ntshav glaze.
2. Qhov cuam tshuam ntawm pH tus nqi ntawm CMC
Lub viscosity ntawm CMC aqueous tov nyob twj ywm nyob rau hauv ib tug dav pH ntau yam, thiab yog ruaj khov tshaj pH 7 thiab 9. Nrog pH
Tus nqi txo, thiab CMC hloov los ntawm ntsev daim ntawv mus rau acid daim ntawv, uas yog insoluble nyob rau hauv dej thiab precipitates. Thaum tus nqi pH tsawg dua 4, feem ntau ntawm cov ntsev daim ntawv hloov mus rau hauv acid daim ntawv thiab precipitates. Thaum pH qis dua 3, qhov kev hloov pauv tsawg dua 0.5, thiab nws tuaj yeem hloov pauv los ntawm daim ntawv ntsev mus rau cov kua qaub. Tus nqi pH ntawm kev hloov pauv tiav ntawm CMC nrog qib siab ntawm kev hloov pauv (saum toj no 0.9) yog qis dua 1. Yog li ntawd, sim siv CMC nrog kev hloov pauv siab rau qhov pom ntawm glaze.
3. Kev sib raug zoo ntawm CMC thiab hlau ions
Monovalent hlau ions tuaj yeem tsim cov dej-soluble ntsev nrog CMC, uas yuav tsis cuam tshuam rau cov viscosity, pob tshab thiab lwm yam khoom ntawm cov tshuaj aqueous, tab sis Ag + yog ib qho kev zam, uas yuav ua rau cov kua dej los nag. Divalent hlau ions, xws li Ba2+, Fe2+, Pb2+, Sn2+, thiab lwm yam. Ca2+, Mg2+, Mn2+, thiab lwm yam tsis muaj kev cuam tshuam rau cov tshuaj. Trivalent hlau ions tsim insoluble ntsev nrog CMC, los yog precipitate los yog gel, yog li ferric chloride tsis tuaj yeem thickened nrog CMC.
Muaj qhov tsis paub tseeb hauv cov txiaj ntsig ntsev ntawm CMC:
(1) Nws muaj feem xyuam rau hom hlau ntsev, pH tus nqi ntawm kev daws thiab qib ntawm kev hloov ntawm CMC;
(2) Nws muaj feem xyuam rau kev sib xyaw ua ke thiab txoj kev CMC thiab ntsev.
CMC nrog rau qib siab ntawm kev hloov pauv tau zoo sib xws nrog cov ntsev, thiab cov txiaj ntsig ntawm kev ntxiv ntsev rau CMC tov yog zoo dua li cov dej ntsev.
CMC zoo. Yog li ntawd, thaum npaj osmotic glaze, feem ntau dissolve CMC hauv dej ua ntej, thiab ces ntxiv osmotic ntsev tov.
02. Yuav ua li cas thiaj paub CMC hauv khw
Classified los ntawm purity
High-purity qib - cov ntsiab lus siab dua 99.5%;
Muaj qib ntshiab - cov ntsiab lus siab dua 96%;
Crude khoom - cov ntsiab lus siab dua 65%.
Classified los ntawm viscosity
Hom viscosity siab - 1% tov viscosity siab dua 5 Pas;
Hom viscosity nruab nrab - viscosity ntawm 2% tov yog siab tshaj 5 Pa s;
Yam tsawg viscosity - 2% tov viscosity saum 0.05 Pa·s.
03. Kev piav qhia ntawm cov qauv sib txawv
Txhua qhov chaw tsim khoom muaj nws tus kheej qauv, nws tau hais tias muaj ntau tshaj 500 hom. Cov qauv feem ntau muaj peb ntu: X-Y-Z.
Thawj tsab ntawv sawv cev rau kev lag luam siv:
F - qib zaub mov;
I — qib kev lag luam;
C - ceramic qib;
O - qib roj av.
Tsab ntawv thib ob sawv cev rau qib viscosity:
H - siab viscosity
M — nruab nrab viscosity
L - tsawg viscosity.
Tsab ntawv thib peb sawv cev rau qib kev hloov pauv, thiab nws tus lej muab faib los ntawm 10 yog qhov tseeb ntawm kev hloov pauv ntawm CMC.
Piv txwv:
Tus qauv ntawm CMC yog FH9, uas txhais tau tias CMC nrog qib zaub mov, siab viscosity thiab hloov qib ntawm 0.9.
Tus qauv ntawm CMC yog CM6, uas txhais tau hais tias CMC ntawm qib ceramic, nruab nrab viscosity thiab hloov qib ntawm 0.6.
Raws li txoj cai, tseem muaj cov qib siv tshuaj, textile thiab lwm yam kev lag luam, uas tsis tshua muaj tshwm sim hauv kev lag luam ceramic.
04. Ceramic Kev Lag Luam Xaiv Cov Qauv
1. Viscosity stability
Qhov no yog thawj tus mob rau kev xaiv CMC rau glaze
(1) Viscosity tsis hloov pauv thaum twg los tau
(2) Viscosity tsis hloov pauv nrog qhov kub thiab txias.
2. Me thixotropy
Hauv kev tsim cov vuas glazed, glaze slurry tsis tuaj yeem yog thixotropic, txwv tsis pub nws yuav cuam tshuam rau qhov zoo ntawm glazed nto, yog li nws yog qhov zoo tshaj rau xaiv cov zaub mov-qib CMC. Txhawm rau txo cov nqi, qee cov tuam txhab siv cov khoom lag luam-qib CMC, thiab cov glaze zoo tau cuam tshuam yooj yim.
3. Ua tib zoo saib rau txoj kev ntsuas viscosity
(1) CMC concentration muaj kev sib raug zoo nrog cov viscosity, yog li yuav tsum tau them nyiaj rau qhov tseeb ntawm qhov hnyav;
(2) Ua tib zoo saib xyuas qhov sib xws ntawm CMC kev daws teeb meem. Txoj kev ntsuas nruj yog do cov tshuaj rau 2 teev ua ntej ntsuas nws cov viscosity;
(3) Qhov kub thiab txias muaj qhov cuam tshuam zoo rau viscosity, yog li yuav tsum tau them nyiaj rau qhov kub thiab txias thaum lub sijhawm kuaj;
(4) Ua tib zoo saib xyuas CMC kev daws teeb meem kom tiv thaiv nws qhov kev puas tsuaj.
(5) Ua tib zoo saib qhov sib txawv ntawm viscosity thiab sib xws.
Post lub sij hawm: Jan-05-2023