Carboxymethylcellulose (CMC) thiab methylcellulose (MC) yog ob qho tib si derivatives ntawm cellulose, ib tug natural polymer pom nyob rau hauv lub cell phab ntsa ntawm cov nroj tsuag. Cov derivatives no nrhiav kev siv dav hauv ntau qhov kev lag luam vim lawv cov khoom tshwj xeeb. Txawm hais tias muaj kev sib koom ua ke, CMC thiab MC muaj qhov sib txawv ntawm lawv cov qauv tshuaj, khoom siv, kev siv, thiab kev siv hauv kev lag luam.
1.Chemical Structure:
Carboxymethylcellulose (CMC):
CMC yog tsim los ntawm etherification ntawm cellulose nrog chloroacetic acid, ua rau kev hloov ntawm hydroxyl pawg (-OH) ntawm cov pob txha cellulose nrog carboxymethyl pawg (-CH2COOH).
Qhov degree ntawm kev hloov pauv (DS) hauv CMC yog hais txog qhov nruab nrab ntawm cov carboxymethyl pawg ib chav tsev piam thaj hauv cov saw cellulose. Qhov kev ntsuas no txiav txim siab cov khoom ntawm CMC, suav nrog kev solubility, viscosity, thiab tus cwj pwm rheological.
Methylcellulose (MC):
MC yog tsim los ntawm kev hloov ntawm hydroxyl pawg hauv cellulose nrog methyl pawg (-CH3) los ntawm etherification.
Zoo ib yam li CMC, cov khoom ntawm MC raug cuam tshuam los ntawm qib ntawm kev hloov pauv, uas txiav txim siab txog qhov methylation raws cov saw cellulose.
2. Solubility:
Carboxymethylcellulose (CMC):
CMC yog soluble nyob rau hauv dej thiab tsim pob tshab, viscous daws.
Nws solubility yog pH-nyob, nrog ntau dua solubility nyob rau hauv alkaline tej yam kev mob.
Methylcellulose (MC):
MC kuj soluble hauv dej, tab sis nws solubility yog kub-nyob ntawm seb.
Thaum yaj nyob rau hauv dej txias, MC tsim ib gel, uas reversibly yaj thaum cua sov. Cov cuab yeej no ua rau nws haum rau cov ntawv thov uas yuav tsum tau tswj gelation.
3.Viscosity:
CMC:
Muab cov viscosity siab nyob rau hauv cov kev daws teeb meem aqueous, ua rau nws cov khoom thickening.
Nws cov viscosity tuaj yeem hloov kho los ntawm kev hloov kho yam xws li concentration, qib kev hloov pauv, thiab pH.
MC:
Qhia txog tus cwj pwm viscosity zoo ib yam li CMC tab sis feem ntau yog tsawg dua.
Lub viscosity ntawm MC cov kev daws teeb meem kuj tuaj yeem tswj tau los ntawm kev hloov pauv tsis zoo li qhov kub thiab txias.
4. Zaj duab xis tsim:
CMC:
Cov ntaub ntawv ntshiab, hloov tau yooj yim thaum nrum los ntawm nws cov kev daws teeb meem aqueous.
Cov yeeb yaj kiab no pom cov ntawv thov hauv kev lag luam xws li ntim khoom noj thiab tshuaj.
MC:
Kuj muaj peev xwm tsim cov yeeb yaj kiab tab sis zoo li nkig ntau dua piv rau CMC cov yeeb yaj kiab.
5. Kev lag luam zaub mov:
CMC:
Dav siv los ua tus stabilizer, thickener, thiab emulsifier hauv cov khoom noj xws li dej khov, kua ntses, thiab hnav khaub ncaws.
Nws lub peev xwm los hloov qhov kev ntxhib los mos thiab lub qhov ncauj ntawm cov khoom noj ua rau nws muaj txiaj ntsig hauv cov khoom noj khoom haus.
MC:
Siv rau cov laj thawj zoo xws li CMC hauv cov khoom noj khoom haus, tshwj xeeb tshaj yog nyob rau hauv daim ntawv thov uas yuav tsum tau gel tsim thiab stabilization.
6. Pharmaceuticals:
CMC:
Siv nyob rau hauv cov tshuaj formulations raws li ib tug binder, disintegrant, thiab viscosity modifier nyob rau hauv ntsiav tshuaj manufacturing.
Kuj ua hauj lwm hauv cov tshuaj pleev ib ce xws li cream thiab gels vim nws cov khoom rheological.
MC:
Feem ntau siv los ua cov thickener thiab gelling tus neeg sawv cev hauv cov chaw muag tshuaj, tshwj xeeb tshaj yog hauv cov tshuaj ua kua hauv qhov ncauj thiab cov tshuaj kho qhov muag.
7. Cov Khoom Siv Kho Tus Kheej:
CMC:
Pom muaj nyob rau hauv ntau yam khoom tu tus kheej xws li tshuaj txhuam hniav, tshuaj zawv plaub hau, thiab tshuaj pleev ib ce ua kom muaj zog thiab ua kom tuab.
MC:
Siv hauv cov ntawv thov zoo sib xws li CMC, pab txhawb kev ntxhib los mos thiab ruaj khov ntawm cov qauv kev saib xyuas tus kheej.
8.Industrial Applications:
CMC:
Ua haujlwm nyob rau hauv kev lag luam xws li textiles, ntawv, thiab ceramics rau nws lub peev xwm los ua ib tug binder, rheology modifier, thiab dej retention agent.
MC:
Pom siv hauv cov ntaub ntawv tsim kho, xim, thiab cov nplaum vim nws cov thickening thiab binding zog.
Thaum carboxymethylcellulose (CMC) thiab methylcellulose (MC) yog ob qho tib si cellulose derivatives nrog ntau hom kev lag luam, lawv pom qhov sib txawv ntawm lawv cov qauv tshuaj, kev coj tus cwj pwm solubility, viscosity profiles, thiab kev siv. Kev nkag siab txog cov kev sib txawv no yog qhov tseem ceeb rau kev xaiv cov khoom tsim nyog rau kev siv tshwj xeeb hauv ntau qhov kev lag luam, xws li khoom noj thiab tshuaj mus rau kev saib xyuas tus kheej thiab kev siv hauv kev lag luam. Txawm hais tias nws yog qhov xav tau rau pH-sensitive thickener zoo li CMC hauv cov khoom noj khoom haus lossis cov tshuaj tiv thaiv kub zoo li MC hauv cov tshuaj formulations, txhua qhov derivative muaj qhov tshwj xeeb zoo rau cov kev cai tshwj xeeb hauv ntau qhov chaw.
Post lub sij hawm: Mar-22-2024