Carboxymethyl cellulose (CMC) tau txais tom qab carboxymethylation ntawm cellulose. Nws cov kua dej muaj cov haujlwm ntawm thickening, zaj duab xis-tsim, bonding, dej khaws cia, colloid tiv thaiv, emulsification thiab suspension, thiab yog dav siv hauv roj av, khoom noj, tshuaj, thiab lwm yam, textile thiab ntawv lag luam, yog ib qho ntawm cov cellulose ethers tseem ceeb tshaj plaws. Cellulose ntuj yog qhov feem ntau faib dav thiab muaj ntau tshaj plaws polysaccharide hauv xwm, thiab nws cov peev txheej nplua nuj heev. Cov txheej txheem hloov kho tam sim no ntawm cellulose feem ntau tsom mus rau etherification thiab esterification. Carboxymethylation yog ib hom etherification technology.
cov khoom siv lub cev
Sodium carboxymethyl cellulose (CMC) yog ib qho anionic cellulose ether, nrog rau cov hmoov fiber flocculent dawb los yog cov hmoov dawb zoo li, tsis muaj ntxhiab, tsis muaj saj, tsis muaj tshuaj lom; yooj yim yaj hauv dej txias lossis dej kub, tsim cov kua nplaum viscosity. Cov kua nplaum yog nruab nrab lossis me ntsis alkaline, tsis yaj hauv ethanol, ether, isopropanol, acetone thiab lwm yam organic solvents, yaj hauv 60% dej-muaj ethanol lossis acetone kua nplaum. Nws yog hygroscopic, ruaj khov rau lub teeb thiab cua sov, viscosity txo qis nrog qhov nce ntawm qhov kub, cov kua nplaum ruaj khov ntawm pH 2-10, pH qis dua 2, muaj cov khoom nag, thiab viscosity txo qis thaum pH siab dua 10. Qhov kub discoloration yog 227 ℃, qhov kub carbonization yog 252 ℃, thiab qhov nro ntawm 2% aqueous yog 71mn / n.
cov khoom siv tshuaj lom neeg
Nws yog npaj los ntawm cellulose derivatives ntawm carboxymethyl substituents, kho cellulose nrog sodium hydroxide los tsim alkali cellulose, thiab tom qab ntawd reacting nrog monochloroacetic acid. Lub glucose unit uas tsim cellulose muaj 3 hydroxyl pawg uas tuaj yeem hloov pauv, yog li cov khoom nrog ntau qib ntawm kev hloov pauv tuaj yeem tau txais. Qhov nruab nrab, 1 mmol ntawm carboxymethyl tau qhia rau ib 1 g ntawm qhov hnyav qhuav, uas yog insoluble hauv dej thiab dilute acid, tab sis tuaj yeem swelled thiab siv rau ion pauv chromatography. Carboxymethyl pKa yog li 4 hauv dej ntshiab thiab li 3.5 hauv 0.5mol / L NaCl. Nws yog ib qho weakly acidic cation exchanger thiab feem ntau yog siv rau kev sib cais ntawm cov protein nruab nrab thiab yooj yim ntawm pH> 4. Ntau tshaj 40% ntawm cov hydroxyl pawg yog hloov los ntawm carboxymethyl pawg, uas tuaj yeem yaj hauv dej los tsim cov tshuaj colloidal ruaj khov siab viscosity.
Lub hom phiaj tseem ceeb
Carboxymethyl cellulose (CMC) yog cov hmoov dawb flocculent uas tsis muaj tshuaj lom thiab tsis muaj ntxhiab, nws muaj kev ua haujlwm ruaj khov thiab yooj yim yaj hauv dej. Nws cov kua dej yog cov kua viscous tsis muaj zog lossis alkaline, yaj hauv lwm cov kua nplaum thiab cov resins uas yaj hauv dej, thiab tsis yaj hauv cov kuab tshuaj organic xws li ethanol. CMC siv tau ua cov nplaum, cov khoom ua kom tuab, cov neeg sawv cev suspending, emulsifier, dispersant, stabilizer, sizing agent, thiab lwm yam.
Sodium carboxymethyl cellulose (CMC) yog cov khoom uas muaj cov zis loj tshaj plaws, siv dav tshaj plaws thiab siv tau yooj yim tshaj plaws ntawm cov cellulose ethers, feem ntau hu ua "kev lag luam monosodium glutamate".
1. Nws yog siv rau kev khawb roj thiab roj av, khawb av thiab lwm yam haujlwm
① Cov av nkos uas muaj CMC tuaj yeem ua rau phab ntsa qhov dej ua ib lub ncuav mog qab zib nyias thiab ruaj khov nrog qhov tsis tshua muaj permeability, uas txo cov dej poob.
② Tom qab ntxiv CMC rau hauv av nkos, lub tshuab drilling tuaj yeem tau txais lub zog qis pib, yog li cov av nkos tuaj yeem tso cov roj qhwv rau hauv nws tau yooj yim, thiab tib lub sijhawm, cov khib nyiab raug pov tseg sai sai rau hauv qhov av nkos.
③ Cov av nkos, zoo li lwm cov khoom tawg, muaj ib lub sijhawm ntawm kev muaj nyob, thiab qhov ntxiv ntawm CMC tuaj yeem ua rau nws ruaj khov thiab ntev lub sijhawm ntawm kev muaj nyob.
④ Cov av nkos uas muaj CMC tsis tshua raug pwm, yog li nws tsis tas yuav tswj tus nqi pH siab thiab siv cov tshuaj preservatives.
⑤ Muaj CMC ua tus neeg sawv cev ntxuav cov kua dej ntxuav av nkos, uas tuaj yeem tiv taus kev ua qias tuaj ntawm ntau yam ntsev soluble.
⑥ Cov av nkos uas muaj CMC muaj kev ruaj khov zoo thiab tuaj yeem txo cov dej poob txawm tias qhov kub siab tshaj 150 ℃.
CMC uas muaj viscosity siab thiab qib siab ntawm kev hloov pauv yog qhov tsim nyog rau cov av nkos uas muaj qhov ceev tsawg, thiab CMC uas muaj viscosity qis thiab qib siab ntawm kev hloov pauv yog qhov tsim nyog rau cov av nkos uas muaj qhov ceev siab. Kev xaiv CMC yuav tsum tau txiav txim siab raws li ntau yam xwm txheej xws li hom av nkos, thaj chaw thiab qhov tob ntawm qhov dej.
2. Siv rau hauv kev lag luam textile, luam ntawv thiab zas xim. Kev lag luam textile siv CMC ua tus neeg sawv cev rau kev ntsuas qhov loj ntawm cov xov paj rwb, cov plaub mos mos, cov tshuaj fiber, sib xyaw thiab lwm yam khoom muaj zog;
3. Siv rau hauv kev lag luam ntawv CMC siv tau ua tus neeg sawv cev rau qhov chaw du thiab tus neeg sawv cev rau qhov loj hauv kev lag luam ntawv. Ntxiv 0.1% txog 0.3% CMC rau ntawm daim ntawv tuaj yeem ua rau lub zog tensile ntawm daim ntawv nce 40% txog 50%, ua rau lub zog compressive nce 50%, thiab ua rau lub zog kneading nce 4 txog 5 zaug.
4. CMC siv tau ua cov av nkos thaum ntxiv rau cov tshuaj ntxuav tes; cov tshuaj txhua hnub xws li kev lag luam tshuaj txhuam hniav CMC glycerin aqueous solution siv ua cov roj hmab rau cov tshuaj txhuam hniav; kev lag luam tshuaj siv ua cov khoom siv tuab thiab emulsifier; CMC aqueous solution yog thickened thiab siv rau kev ua cov minerals ntab, thiab lwm yam.
5. Hauv kev lag luam ceramic, nws tuaj yeem siv ua cov nplaum, cov yas ua kom zoo nkauj, cov neeg sawv cev rau kev pleev xim, cov neeg sawv cev kho xim, thiab lwm yam.
6. Siv rau hauv kev tsim kho kom txhim kho kev khaws dej thiab lub zog
7. Nws yog siv rau hauv kev lag luam zaub mov. Kev lag luam zaub mov siv CMC nrog qib siab hloov pauv ua cov khoom ua kom tuab rau ice cream, zaub mov hauv qab, cov noodles siav sai, thiab cov khoom ua npuas dej rau npias, thiab lwm yam. Rau cov khoom ua kom tuab, cov khoom khi lossis cov khoom siv ntxiv.
8. Kev lag luam tshuaj xaiv CMC nrog viscosity tsim nyog ua cov ntsiav tshuaj binder, disintegrant, thiab suspension agent rau suspensions.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-03-2022