ntsib thawj zaug
Cellulose muaj neeg muaj kev hais ua yog anionic dej-soluble polymers muab tau los ntawm cellulose. Cov neeg polymers muaj ntau cov kev lag luam, cov chaw muag tshuaj, tshuaj pleev ib ce, thiab tsim kho kom tuab, ua yeeb yaj kiab, thiab emulsifying. Ib qho ntawm cov khoom tseem ceeb tshaj plaws ntawm cov kws ua haujlwm hauv cellulose yog lawv cov cua sov gelation kub (qhov kub uas cov neeg ua haujlwm hloov pauv theem mus rau gel. Cov cuab yeej no yog qhov tseem ceeb hauv kev txiav txim siab cov kev ua tau zoo ntawm cov kws ua haujlwm ntawm cellulose hauv ntau yam kev siv. Hauv tsab xov xwm no, peb sib tham txog cov thermal gelation kub ntawm hydroxypropylulose (HPMC), yog ib qho ntawm cov neeg siv cellulose feem ntau hauv kev lag luam.
Thermal gelation kub ntawm HPMC
HPMC yog lub cellticnetic sighthulose etle dav hauv ntau cov ntawv thov vim nws cov khoom tshwj xeeb. HPMC yog soluble heev hauv dej, sib sau cov kev daws teeb meem ntshiab ntawm cov kev ua kom muaj ntau. Ntawm ntau dua cov kev xav, HPMC cov qauv tshuaj pleev cov qauv uas tau thim rov qab thaum cua sov thiab txias. Thermal gelation ntawm HPMC yog ob-kauj ruam txheej txheem koom nrog kev tsim ntawm Mikelles ua raws li kev sib sau ua ke ntawm cov Gel network (Daim Duab 1).
Lub thermal gelation kub ntawm HPMC nyob ntawm ntau yam xws li qib kev hloov pauv (DS), molecular hnyav, thiab ph ntawm kev daws teeb meem. Feem ntau, qhov siab dua DS thiab Molecular qhov hnyav ntawm HPMC, qhov siab dua cov thermal gelation kub. Cov concentration ntawm kev daws teeb meem tseem cuam tshuam rau cov lus qhia, qhov siab dua ntawm cov siab, siab dua. PHIC ntawm kev daws teeb meem tseem cuam tshuam rau cov tg, nrog kua qaub acidic ua rau hauv qab.
Thermal gelation ntawm HPMC yog reversible thiab tuaj yeem cuam tshuam los ntawm ntau yam lwm yam sab nraud xws li shear zog, thiab ntsev kom sov. Shear rhuav cov qauv gel thiab lowers lub tg, thaum nce kev kub ua rau lub gel kom yaj thiab txo qis lub tg. Ntxiv ntsev rau kev daws teeb meem tseem cuam tshuam rau cov lus qhia, thiab muaj kev thaj chaw xws li calcium thiab magnesium nce tg.
Daim ntawv thov ntawm sib txawv TG HPMC
Lub thermogiging cwj pwm ntawm HPMC tuaj yeem ua kom haum rau cov ntawv thov sib txawv. Low TG HPMCCS tau siv rau hauv cov ntawv thov uas yuav tsum tau ua kom nrawm nrawm, xws li cov khoom noj qab zib tam sim ntawd, sauce thiab kua zaub formul aus. HPMC nrog lub siab tg yog siv rau hauv cov ntawv thov uas yuav tsum tau ncua lossis ntev ua cov tshuaj tso tawm, thiab cov tshuaj hnav zoo nkauj.
Hauv kev lag luam khoom noj khoom haus, HPMC yog siv los ua cov tuab, stabilizer thiab gelling tus neeg sawv cev. Tsawg TG HPMC tau siv hauv cov khoom noj qab zib sai uas yuav tsum tau muab cov kev xav tau nrawm thiab cov ncauj lus xav tau kom muaj qhov xav tau thiab qhov ncauj xav tau. HPMC nrog lub siab tawv yog siv rau hauv cov rog uas tsis muaj roj tsawg uas qeeb lossis lub sijhawm ntev los tiv thaiv cov qauv kev kawm.
Hauv kev lag luam kws tshuaj, HPMC yog siv los ua cov phau ntawv, cov neeg tsis sib haum xeeb thiab tus neeg sawv cev tso tawm. HPMC nrog lub siab tg yog siv nyob rau hauv cov ntsiav tshuaj ntawm kev tso tawm cov ntsiav tshuaj, qhov twg ncua sij hawm yog xav tau los tso cov tshuaj tshaj lub sijhawm ncua sijhawm. Tsawg TG HPMC tau siv nyob rau hauv kev tsim tawm ntawm kev sib cav sib ceg, qhov uas tsis txaus ntseeg yuav tsum muab qhov ncauj xav tau los muab cov qhov ncauj xav tau thiab yooj yim ntawm nqos.
Hauv kev xaus
Lub thermal gelation kub ntawm HPMC yog cov khoom tseem ceeb uas txiav txim siab nws tus cwj pwm hauv ntau yam kev siv. HPMC tuaj yeem hloov kho nws txoj kev ntxhov siab ntawm qhov hloov chaw, kev hnyav molecular, concentration thiab pens muaj nuj nqis los suav cov ntawv thov sib txawv. HPMC nrog tus nqi qis yog siv rau cov ntawv thov uas yuav tsum tau ua kom nrawm nrawm, thaum HPMC nrog lub siab tg yog siv rau kev thov ncua lossis lub sijhawm ntev. HPMC yog qhov ntau yam thiab ntau yam ntawm cellulose ether nrog ntau cov ntawv thov hauv ntau yam kev lag luam.
Lub Sijhawm Post: Lub Yim Hli 24-2023