CMC feem ntau yog ib qho anionic polymer compound npaj los ntawm reacting ntuj cellulose nrog caustic alkali thiab monochloroacetic acid, nrog ib tug molecular hnyav ntawm 6400 (± 1 000). Cov by-products tseem ceeb yog sodium chloride thiab sodium glycolate. CMC yog ib feem ntawm ntuj cellulose hloov kho. Nws tau raug hu ua "modified cellulose" los ntawm Food and Agriculture Organization of the United Nations (FAO) thiab World Health Organization (WHO).
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Cov cim qhia tseem ceeb los ntsuas qhov zoo ntawm CMC yog qib ntawm kev hloov pauv (DS) thiab kev huv. Feem ntau, cov khoom ntawm CMC txawv thaum DS txawv; qhov siab dua qib ntawm kev hloov pauv, qhov zoo dua qhov solubility, thiab qhov zoo dua qhov pob tshab thiab kev ruaj khov ntawm cov tshuaj. Raws li cov ntawv ceeb toom, qhov pob tshab ntawm CMC zoo dua thaum qib ntawm kev hloov pauv yog 0.7-1.2, thiab qhov viscosity ntawm nws cov kua dej yog qhov loj tshaj plaws thaum tus nqi pH yog 6-9. Yuav kom ntseeg tau tias nws zoo, ntxiv rau kev xaiv tus neeg sawv cev etherifying, qee yam uas cuam tshuam rau qib ntawm kev hloov pauv thiab kev huv kuj yuav tsum tau xav txog, xws li kev sib raug zoo ntawm alkali thiab etherifying tus neeg sawv cev, lub sijhawm etherification, cov dej hauv lub cev, qhov kub, tus nqi pH, cov tshuaj concentration thiab ntsev.
Kev tshuaj xyuas qhov zoo thiab qhov tsis zoo ntawm sodium carboxymethyl cellulose
Kev tsim cov sodium carboxymethyl cellulose yeej tsis tau muaj dua li. Tshwj xeeb tshaj yog nyob rau xyoo tas los no, kev nthuav dav ntawm cov teb thov thiab kev txo cov nqi tsim khoom tau ua rau kev tsim cov carboxymethyl cellulose nrov dua thiab ntau dua. Cov khoom muag tau sib xyaw.
Tom qab ntawd, yuav ua li cas txiav txim siab qhov zoo ntawm sodium carboxymethyl cellulose, peb tshuaj xyuas los ntawm qee qhov kev xav ntawm lub cev thiab tshuaj lom neeg:
Ua ntej tshaj plaws, nws tuaj yeem paub qhov txawv ntawm nws qhov kub thiab txias carbonization. Qhov kub thiab txias carbonization dav dav ntawm sodium carboxymethyl cellulose yog 280-300 ° C. Thaum nws raug carbonized ua ntej qhov kub no mus txog, ces cov khoom no muaj teeb meem. (Feem ntau carbonization siv lub cub tawg muffle)
Qhov thib ob, nws yog qhov sib txawv los ntawm nws qhov kub hloov pauv. Feem ntau, sodium carboxymethyl cellulose yuav hloov xim thaum nws mus txog qee qhov kub. Qhov kub thiab txias yog 190-200 ° C.
Qhov thib peb, nws tuaj yeem txheeb xyuas los ntawm nws cov tsos. Cov tsos ntawm feem ntau cov khoom yog hmoov dawb, thiab nws cov khoom me me feem ntau yog 100 mesh, thiab qhov tshwm sim ntawm kev hla dhau yog 98.5%.
Sodium carboxymethyl cellulose yog ib yam khoom siv cellulose uas siv dav heev thiab muaj ntau yam kev siv, yog li ntawd tej zaum yuav muaj qee qhov kev ua qauv ntawm kev ua lag luam. Yog li yuav ua li cas txheeb xyuas seb nws puas yog cov khoom uas cov neeg siv xav tau tuaj yeem dhau qhov kev xeem txheeb xyuas hauv qab no.
Xaiv 0.5g ntawm sodium carboxymethyl cellulose, uas tsis paub tseeb tias nws yog cov khoom ntawm sodium carboxymethylcellulose, yaj nws hauv 50mL dej thiab do, ntxiv me me txhua zaus, do ntawm 60 ~ 70 ℃, thiab cua sov rau 20 feeb kom ua ib qho kev daws teeb meem, txias Tom qab kuaj pom cov kua, cov kev sim hauv qab no tau ua tiav.
1. Ntxiv dej rau hauv cov tshuaj sim kom yaj 5 zaug, ntxiv 0.5mL ntawm cov tshuaj sim chromotropic acid rau 1 tee ntawm nws, thiab ua kom sov hauv lub dab dej dej rau 10 feeb kom pom xim liab-ntshav.
2. Ntxiv 10 mL ntawm acetone rau hauv 5 mL ntawm cov kua kuaj, co thiab sib tov kom huv si kom tsim tau cov dej dawb flocculent.
3. Ntxiv 1mL ntawm cov kua kuaj ketone sulfate rau hauv 5mL ntawm cov kua kuaj, sib tov thiab co kom ua tau cov dej xiav daj.
4. Cov khoom seem tau los ntawm kev ua kom cov khoom no ashing qhia txog cov tshuaj tiv thaiv ib txwm muaj ntawm sodium ntsev, uas yog, sodium carboxymethyl cellulose.
Los ntawm cov kauj ruam no, koj tuaj yeem txheeb xyuas seb cov khoom yuav puas yog sodium carboxymethyl cellulose thiab nws qhov huv, uas muab ib txoj hauv kev yooj yim thiab siv tau rau cov neeg siv los xaiv cov khoom kom raug.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-12-2022