Cellulose yog lub tseem ceeb tivthaiv ntawm cov nroj tsuag ntawm tes thiab muaj ntau tshaj organic polymer hauv ntiaj teb. Cellulose derivatives yog siv nyob rau hauv ntau cov kev siv cov kev siv tau, suav nrog cov zaub mov, cov chaw muag tshuaj thiab kev tsim kho. Qhov ob feem ntau cov neeg nrov tshaj plaws cellulose yog hydroxypropylencellulose (HPMC) thiab methylcellulose (MC). Cov ob yam khoom no feem ntau siv sib hloov, tab sis lawv muaj qee qhov sib txawv uas yuav tsum tau txiav txim siab.
Dab tsi yog hydroxypropyl methylulose?
HydroxyPropyyl Metylcellulose yog qhov tsis muaj kev paub txog lub cev, dej-soluble cellulose ether tau los ntawm lub ntuj polymer cellulose. Cov qauv molecular ntawm HPMC zoo sib xws rau cov cellulose ntuj, ua rau nws xaiv tau zoo rau ntau daim ntawv thov muaj ntau cov ntawv thov. Nws cov khoom siv molecular, suav nrog solubility thiab viscosity, ua rau nws zoo tagnrho rau kev siv hauv tsev cov ntaub ntawv, khoom noj khoom haus, chaw muag tshuaj thiab tshuaj pleev ib ce.
Cov yam ntxwv ntawm HPMC:
1. Solubility:
Ib qho ntawm qhov tseem ceeb tshaj plaws ntawm HPMC yog nws solubility. HPMC yog yooj yim soluble nyob rau hauv dej txias, sib sau ib qho tseeb, ruaj khov, tsis muaj kuab. Qhov no ua rau HPMC ib qho nplaum zoo tagnrho rau ntau qhov kev lag luam, suav nrog kev tsim kho thiab chaw muag tshuaj.
2. Viscosity:
HPMC muaj cov viscosity siab thiab yog qhov zoo rau cov kua thickening. Nws cov viscosity siab yog feem ntau ua rau nws cov pab pawg hydroxyprropyl, uas nce nws lub peev xwm los tsim cov kev sib txuas lus hydrogen thiab txhawb nqa nrog dej lwg me me.
3. Zaj duab xis tsim:
HPMC yog ib tug neeg sawv cev ua yeeb yaj kiab zoo heev thiab yog siv nyob rau hauv kev lag luam tshuaj rau txheej ntsiav tshuaj thiab ntsiav tshuaj. Qhov no tsim kev thaiv kev ya raws thiab lwm qhov chaw ib puag ncig, muaj feem yuav ua rau cov tshuaj txheem txee.
4. Muaj Siab Purity:
HPMC yog cov khoom siab siab thiab yog cov khoom lag luam uas tsis muaj cov tshuaj muaj kev phom sij. Qhov no ua rau nws zoo tagnrho rau cov khoom noj thiab kev lag luam kom hniav.
Methylcellulose yog dab tsi?
Methylcellulose kuj yog lub cellulose ether tau los ntawm cellulose fibers. Nws yog methyl ester ntawm cov qauv molulose yog txawv heev los ntawm cov vaj tse ntuj cellulose, uas ua rau nws tsis tshua muaj kev cuam tshuam rau enzyme degradation. Methylcellulose yog cov kev sib xyaw ua ke tau siv nyob rau hauv ntau yam kev lag luam suav nrog cov zaub mov noj suav nrog cov zaub mov noj, chaw muag tshuaj, kev tsim kho thiab tshuaj pleev ib ce.
Cov yam ntxwv ntawm Methylcellulose:
1. Dej Solubility:
Methylcellulose tau yooj yim nyob rau hauv dej txias, sib sau ua ib qho ntshiab, viscous, thiab cov daws tau zoo heev. Tab sis nws solubility yog qis dua HPMC. Qhov no ua rau nws haum kom haum rau kev siv hauv kev lag luam uas xav tau qib siab ntawm solubility, xws li kev tsim kho.
2. Viscosity:
Methylcellulose muaj lub viscosity siab thiab yog qhov zoo rau cov kua thickening. Nws cov viscosity tseem yog ntaus nqi rau nws cov pab pawg methyl uas cuam tshuam nrog dej lwg me.
3. Zaj duab xis tsim:
Methylcellulose yog tus neeg sawv cev ua yeeb yaj kiab zoo heev thiab yog siv nyob rau hauv kev lag luam cov ntsiav tshuaj thiab ntsiav tshuaj. Txawm li cas los xij, nws cov yeeb yaj kiab ua yeeb yaj kiab yog qhov tseem ceeb me ntsis rau HPMC.
4. Muaj Siab Purity:
Methylcellulose yog cov ntshiab heev thiab yog cov khoom lag luam uas tsis muaj cov tshuaj muaj kev phom sij. Qhov no ua rau nws zoo tagnrho rau cov khoom noj thiab kev lag luam kom hniav.
Kev sib piv ntawm HPMC thiab MC:
1. Solubility:
HPMC yog ntau soluble hauv dej li methylculose. Qhov no solubility sib txawv ua rau HPMC muaj kev xaiv ntau dua rau kev lag luam uas xav tau siab solubility, xws li kev tsim kho.
2. Viscosity:
Ob qho tib si HPMC thiab methylcellulose muaj viscosities siab. Txawm li cas los xij, lub viscosity ntawm HPMC yog siab me ntsis siab dua li methylcellulose. Qhov no ua rau HPMC ntau tsim nyog rau kev siv hauv kev lag luam uas yuav tsum muaj viscosities, xws li cov zaub mov thiab cov tshuaj pleev ib ce.
3. Zaj duab xis tsim:
HPMC thiab methylcellulose yog ob qho tib si zoo nkauj ua yeeb yaj kiab. Txawm li cas los xij, HPMC muaj kev ua yeeb yaj kiab me ntsis zoo dua li cov khoom siv methylulose, ua rau nws tsim kev lag luam ntau dua.
4. Purity:
HPMC thiab methylcellulose yog ob qho kev ua tsis huv cov khoom uas tsis muaj cov tshuaj muaj kev phom sij.
HydroxyPropyyl methylcellulose thiab methylcellulose yog ob qho tseem ceeb ntawm cellule derivatives siv nyob rau hauv ntau yam kev lag luam. Ob lub tebchaw muaj siab solubility, siab viscosity, zoo nkauj zaj duab xis-tsim cov khoom thiab muaj siab purity. Txawm li cas los xij, lub solubility thiab viscosity ntawm hpmc yog siab dua li cov methylcellulose, ua rau nws haum ntau rau kev lag luam solubility thiab viscosity. Tsis tas li ntawd, HPMC tau zoo dua cov yeeb yaj kiab-ua yeeb yam zoo dua li methylcellose, ua rau nws tsim nyog dua siv hauv kev lag luam kws tshuaj. Txawm li cas los xij, ob qho tib si muaj cov khoom uas muaj cov khoom uas ua rau lawv muaj kev sib raug zoo, thiab lawv siv yuav tsum txiav txim siab raws li cov ntawv thov.
Lub Sijhawm Post: Feb-19-2025