01. Cov khoom ntawm sodium carboxymethylcellulose
Sodium carboxymethyl cellulose yog ib qho electrolyte anionic polymer. Qib ntawm kev hloov pauv ntawm CMC lag luam yog txij li 0.4 txog 1.2. Nyob ntawm qhov huv, qhov tsos yog dawb lossis hmoov dawb tawm.
1. Qhov viscosity ntawm cov tshuaj
Qhov viscosity ntawm CMC aqueous kua nce sai nrog rau qhov nce ntawm concentration, thiab cov kua muaj pseudoplastic ntws yam ntxwv. Cov kua nrog qib qis dua ntawm kev hloov pauv (DS = 0.4-0.7) feem ntau muaj thixotropy, thiab qhov viscosity pom tseeb yuav hloov pauv thaum shear yog thov lossis tshem tawm rau cov kua. Lub viscosity ntawm CMC aqueous kua txo qis nrog rau qhov kub nce, thiab qhov cuam tshuam no yog reversible thaum qhov kub tsis tshaj 50 ° C. Ntawm qhov kub siab dua rau lub sijhawm ntev, CMC yuav degrade. Qhov no yog qhov laj thawj vim li cas cov bleed glaze yog yooj yim tig dawb thiab deteriorate thaum luam tawm cov kab nyias qauv bleed glaze.
Cov CMC siv rau glaze yuav tsum xaiv cov khoom uas muaj qib siab ntawm kev hloov pauv, tshwj xeeb tshaj yog cov bleeding glaze.
2. Cov nyhuv ntawm tus nqi pH rau CMC
Lub viscosity ntawm CMC aqueous kua tseem zoo li qub nyob rau hauv ib tug dav pH ntau yam, thiab yog feem ntau ruaj khov ntawm pH 7 thiab 9. Nrog pH
Tus nqi txo qis, thiab CMC hloov ntawm cov ntsev mus rau cov kua qaub, uas tsis yaj hauv dej thiab ua rau muaj nag lossis daus. Thaum tus nqi pH tsawg dua 4, feem ntau ntawm cov ntsev hloov mus rau hauv cov kua qaub thiab ua rau muaj nag lossis daus. Thaum pH qis dua 3, qib kev hloov pauv tsawg dua 0.5, thiab nws tuaj yeem hloov pauv tag nrho ntawm cov ntsev mus rau cov kua qaub. Tus nqi pH ntawm kev hloov pauv tag nrho 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 qib siab ntawm kev hloov pauv rau cov kua nplaum ntws.
3. Kev sib raug zoo ntawm CMC thiab cov hlau ions
Cov hlau ions monovalent tuaj yeem tsim cov ntsev uas yaj hauv dej nrog CMC, uas yuav tsis cuam tshuam rau qhov viscosity, transparency thiab lwm yam khoom ntawm cov kua dej, tab sis Ag + yog qhov tshwj xeeb, uas yuav ua rau cov kua dej los nag. Cov hlau ions divalent, xws li Ba2 +, Fe2 +, Pb2 +, Sn2 +, thiab lwm yam ua rau cov kua dej los nag; Ca2 +, Mg2 +, Mn2 +, thiab lwm yam tsis muaj feem cuam tshuam rau cov kua dej. Cov hlau ions trivalent tsim cov ntsev uas tsis yaj nrog CMC, lossis nag lossis gel, yog li ferric chloride tsis tuaj yeem tuab nrog CMC.
Muaj qee qhov tsis paub meej txog qhov cuam tshuam ntawm CMC rau kev ua kom ntsev tsis txhob ntsev:
(1) Nws muaj feem xyuam rau hom ntsev hlau, tus nqi pH ntawm cov tshuaj thiab qib kev hloov pauv ntawm CMC;
(2) Nws muaj feem xyuam rau qhov kev sib tov thiab txoj kev ntawm CMC thiab ntsev.
CMC nrog qib siab ntawm kev hloov pauv muaj kev sib raug zoo dua nrog cov ntsev, thiab cov nyhuv ntawm kev ntxiv ntsev rau hauv CMC kua zoo dua li ntawm cov dej ntsev.
CMC zoo. Yog li ntawd, thaum npaj cov kua nplaum osmotic, feem ntau yaj CMC hauv dej ua ntej, thiab tom qab ntawd ntxiv cov kua ntsev osmotic.
02. Yuav ua li cas thiaj paub txog CMC hauv kev ua lag luam
Faib raws li kev huv si
Qib siab purity - cov ntsiab lus yog siab tshaj 99.5%;
Qib ntshiab kev lag luam - cov ntsiab lus yog siab dua 96%;
Khoom nyoos - cov ntsiab lus yog siab tshaj 65%.
Faib tawm los ntawm viscosity
Hom viscosity siab - 1% viscosity ntawm cov kua yog siab dua 5 Pa s;
Hom viscosity nruab nrab - qhov viscosity ntawm 2% kev daws teeb meem yog siab dua 5 Pa s;
Hom viscosity qis - 2% viscosity ntawm cov kua saum toj no 0.05 Pa·s.
03. Kev piav qhia txog cov qauv uas siv ntau
Txhua lub chaw tsim khoom muaj nws tus qauv, lawv hais tias muaj ntau tshaj 500 hom. Tus qauv feem ntau muaj peb ntu: X—Y—Z.
Tsab ntawv thawj zaug sawv cev rau kev siv hauv kev lag luam:
F - qib zaub mov;
Kuv——qib kev lag luam;
C - qib ceramic;
O - qib roj av.
Tsab ntawv thib ob sawv cev rau qib viscosity:
H - viscosity siab
M——qhov nruab nrab viscosity
L - viscosity qis.
Tsab ntawv thib peb sawv cev rau qib kev hloov pauv, thiab nws tus lej faib los ntawm 10 yog qib kev hloov pauv tiag tiag ntawm CMC.
Piv txwv li:
Tus qauv ntawm CMC yog FH9, uas txhais tau tias CMC nrog qib zaub mov, viscosity siab thiab qib hloov pauv ntawm 0.9.
Tus qauv ntawm CMC yog CM6, uas txhais tau tias CMC ntawm qib ceramic, nruab nrab viscosity thiab qib hloov pauv ntawm 0.6.
Zoo li ntawd, kuj muaj cov qib siv hauv tshuaj, textile thiab lwm yam lag luam, uas tsis tshua muaj neeg pom hauv kev siv kev lag luam ceramic.
04. Cov Qauv Xaiv Kev Lag Luam Ceramic
1. Kev ruaj khov ntawm viscosity
Qhov no yog thawj qhov xwm txheej rau kev xaiv CMC rau glaze
(1) Viscosity tsis hloov pauv ntau lub sijhawm twg los tau
(2) Viscosity tsis hloov pauv ntau nrog qhov kub thiab txias.
2. Me me thixotropy
Thaum tsim cov vuas glazed, cov glaze slurry tsis tuaj yeem thixotropic, txwv tsis pub nws yuav cuam tshuam rau qhov zoo ntawm qhov glazed nto, yog li nws yog qhov zoo tshaj plaws los xaiv cov khoom noj khoom haus-qib CMC. Yuav kom txo cov nqi, qee cov chaw tsim khoom siv cov khoom lag luam-qib CMC, thiab qhov zoo ntawm glaze yooj yim cuam tshuam.
3. Ua tib zoo saib xyuas txoj kev ntsuas viscosity
(1) Qhov kev sib xyaw ua ke ntawm CMC muaj kev sib raug zoo nrog qhov viscosity, yog li yuav tsum tau them sai sai rau qhov tseeb ntawm kev ntsuas qhov hnyav;
(2) Ua tib zoo saib xyuas qhov sib xws ntawm cov tshuaj CMC. Txoj kev sim nruj yog do cov tshuaj rau 2 teev ua ntej ntsuas nws cov viscosity;
(3) Kub muaj feem cuam tshuam loj rau viscosity, yog li yuav tsum tau them sai sai rau qhov kub thiab txias thaum lub sijhawm sim;
(4) Ua tib zoo saib xyuas kev khaws cia ntawm CMC kua kom tiv thaiv nws qhov kev puas tsuaj.
(5) Ua tib zoo saib qhov sib txawv ntawm viscosity thiab consistency.
Lub sijhawm tshaj tawm: Lub Ib Hlis-05-2023