Methylcellulose (MC) thiab Hydroxypropyl Methylcellulose (HPMC) yog ob qho tib si siv dej-soluble cellulose derivatives, dav siv hauv zaub mov, tshuaj, kev tsim kho thiab kev saib xyuas tus kheej.
1. Cov qauv sib txawv
Methylcellulose (MC):
Methylcellulose yog cellulose derivative tau los ntawm kev hloov ib feem ntawm hydroxyl pawg ntawm cellulose nrog methyl (-OCH3).
Nws cov qauv tshuaj yog qhov yooj yim, feem ntau yog tsim los ntawm cov pob txha cellulose thiab cov methyl hloov pauv.
Hydroxypropyl Methylcellulose (HPMC):
HPMC yog tsim los ntawm kev nthuav qhia ntxiv hydroxypropyl (-C3H7O) hloov pauv raws li methylcellulose.
Qhov kev hloov ntawm cov qauv no ua rau nws muaj txiaj ntsig zoo dua nyob rau hauv cov nqe lus ntawm solubility thiab viscosity yam ntxwv hauv dej.
2. Solubility
Methylcellulose yog yooj yim soluble nyob rau hauv dej txias, tab sis tsis yooj yim soluble nyob rau hauv dej kub, thiab feem ntau muaj ib tug colloidal xwm. Qhov no ua rau MC cov khoom tuaj yeem hloov pauv thaum kub nce.
Hydroxypropyl Methylcellulose tuaj yeem yaj tau zoo hauv dej txias thiab kub, thiab nws cov solubility zoo dua li ntawm methylcellulose. HPMC tseem tuaj yeem tswj hwm nws cov dej solubility ntawm qhov kub thiab txias thiab tsim nyog rau cov ntawv thov uas xav tau kev kho cua sov.
3. Cov yam ntxwv viscosity
Methylcellulose muaj cov viscosity tsawg thiab yog tsim rau cov formulations uas tsis xav tau viscosity siab.
Hydroxypropyl methylcellulose muaj viscosity ntau dua thiab tuaj yeem hloov kho los ntawm kev hloov nws qhov hnyav molecular thiab qib ntawm kev hloov pauv. Qhov no ua rau HPMC hloov tau yooj yim hauv ntau yam kev siv, tshwj xeeb tshaj yog nyob rau hauv kev tsim kho thiab kev lag luam tshuaj.
4. Cov chaw thov
Methylcellulose feem ntau siv nyob rau hauv kev lag luam khoom noj khoom haus raws li ib tug thickener, emulsifier thiab stabilizer, thiab kuj yog siv nyob rau hauv ib co tshuaj cov khoom raws li ib tug txheej txheej rau tshuaj.
Hydroxypropyl methylcellulose muaj kev siv dav dua. Ntxiv nrog rau cov khoom noj thiab tshuaj, nws kuj tau siv dav hauv cov khoom siv hauv tsev (xws li cov tshuaj khib nyiab qhuav) thiab cov khoom siv tu tus kheej (xws li cov tshuaj pleev ib ce thiab tshuaj zawv plaub hau) vim nws cov yeeb yaj kiab zoo tsim thiab adhesion zog.
5. Cov yam ntxwv ua tau zoo
Methylcellulose muaj cov dej tuav tau zoo thiab ua cov yeeb yaj kiab thiab feem ntau siv rau hauv cov khoom uas yuav tsum tau khaws cov dej noo.
Hydroxypropyl methylcellulose muaj cov cua kub zoo thiab cov yeeb yaj kiab zoo heev ntxiv rau cov dej tuav, yog li nws ua tau zoo dua hauv kev siv nrog kev kho kub.
6. Kev nyab xeeb thiab ruaj khov
Ob leeg yog cov khoom noj uas tsis muaj tshuaj lom thiab feem ntau suav tias muaj kev nyab xeeb. Txawm li cas los xij, HPMC tej zaum yuav nyiam nyob rau hauv qee daim ntawv thov vim nws qhov kev ruaj ntseg zoo dua thiab kev sib raug zoo.
Methylcellulose thiab hydroxypropyl methylcellulose sib txawv hauv cov qauv tshuaj, solubility, viscosity yam ntxwv thiab daim ntawv thov. Kev xaiv cov khoom tsim nyog feem ntau nyob ntawm qhov xav tau ntawm ib daim ntawv thov tshwj xeeb. MC yog qhov tsim nyog rau kev siv yooj yim thickening thiab stabilization, thaum HPMC yog qhov tsim nyog rau kev lag luam thiab kev lag luam kev lag luam vim nws cov dej solubility zoo dua thiab muaj peev xwm hloov kho viscosity.
Post lub sij hawm: Oct-21-2024