HPMC tswj cov viscosity ntawm emulsion li cas?

HPMC (hydroxypropyl methylcellulose) yog cov dej-soluble polymer khoom siv dav hauv kev tsim kho, tshuaj, khoom noj thiab tshuaj txhua hnub.Nws muaj cov thickening zoo, emulsification, film-forming, tiv thaiv colloid thiab lwm yam khoom.Hauv emulsion systems, HPMC tuaj yeem tswj cov viscosity ntawm emulsion nyob rau hauv ntau txoj kev.

1. Molecular qauv ntawm HPMC
Lub viscosity ntawm HPMC feem ntau cuam tshuam los ntawm nws qhov hnyav molecular thiab qib ntawm kev hloov pauv.Qhov loj dua qhov hnyav molecular, qhov siab dua qhov viscosity ntawm cov tshuaj;thiab qib ntawm kev hloov pauv (uas yog, qib ntawm kev hloov pauv ntawm hydroxypropyl thiab methoxy pawg) cuam tshuam rau kev solubility thiab viscosity ntawm HPMC.Tshwj xeeb, qhov siab dua qhov kev hloov pauv, qhov zoo dua cov dej solubility ntawm HPMC, thiab cov viscosity nce raws li.Cov neeg tsim khoom feem ntau muab HPMC cov khoom lag luam nrog qhov sib txawv molecular hnyav thiab qib hloov pauv kom tau raws li qhov xav tau ntawm kev siv sib txawv.

2. Siv cov concentration
Qhov concentration ntawm HPMC hauv cov kua dej aqueous yog ib qho tseem ceeb cuam tshuam rau viscosity.Feem ntau hais lus, qhov siab dua ntawm HPMC, qhov ntau dua qhov viscosity ntawm cov tshuaj.Txawm li cas los xij, qhov viscosity ntawm ntau hom HPMC ntawm tib qhov concentration tuaj yeem sib txawv heev.Yog li ntawd, nyob rau hauv kev siv tswv yim, nws yog tsim nyog los xaiv ib tug tsim nyog concentration ntawm HPMC tshuaj raws li ib tug tshwj xeeb viscosity yuav tsum tau.Piv txwv li, nyob rau hauv kev tsim kho daim ntawv thov, qhov concentration ntawm HPMC feem ntau yog tswj ntawm 0.1% thiab 1% los muab kev ua hauj lwm viscosity thiab kev tsim kho.

3. Txoj kev sib cais
Cov txheej txheem kev sib cais ntawm HPMC kuj tseem muaj feem cuam tshuam rau qhov kawg viscosity.HPMC yog ib qho yooj yim rau disperse nyob rau hauv dej txias, tab sis tus nqi dissolution qeeb;Nws yaj sai sai hauv dej kub, tab sis nws yooj yim rau agglomerate.Txhawm rau kom tsis txhob agglomeration, cov txheej txheem sib ntxiv tuaj yeem siv tau, uas yog, ua ntej maj mam ntxiv HPMC rau cov dej txias kom tawg, ces kub thiab do kom txog thaum yaj tag.Tsis tas li ntawd, HPMC kuj tseem tuaj yeem muab sib xyaw nrog lwm cov hmoov qhuav thiab tom qab ntawd ntxiv rau cov dej kom yaj kom txhim kho kev ua tau zoo thiab viscosity stability.

4. Kub
Qhov kub thiab txias muaj qhov cuam tshuam loj rau cov viscosity ntawm HPMC cov kev daws teeb meem.Feem ntau, cov viscosity ntawm HPMC cov tshuaj txo qis thaum qhov kub nce.Qhov no yog vim qhov kub nce yuav ua rau tsis muaj zog ntawm hydrogen bonding ntawm molecules, ua rau HPMC molecular saw swb yooj yim dua, yog li txo cov viscosity ntawm cov tshuaj.Yog li ntawd, nyob rau hauv daim ntawv thov uas yuav tsum tau viscosity siab, HPMC cov kev daws teeb meem yog feem ntau siv nyob rau hauv qis kub.Piv txwv li, hauv kev siv tshuaj, HPMC cov kev daws teeb meem feem ntau siv nyob rau hauv chav tsev kub kom ntseeg tau tias kev ruaj ntseg thiab kev ua tau zoo ntawm cov tshuaj.

5. pH tus nqi
Lub viscosity ntawm HPMC cov tshuaj kuj cuam tshuam los ntawm pH tus nqi.HPMC muaj cov viscosity siab tshaj plaws nyob rau hauv nruab nrab thiab tsis muaj zog acidic tej yam kev mob, thaum lub viscosity yuav txo qis nyob rau hauv muaj zog acidic los yog alkaline tej yam kev mob.Qhov no yog vim huab cua pH qhov tseem ceeb yuav rhuav tshem cov qauv molecular ntawm HPMC thiab tsis muaj zog nws cov nyhuv thickening.Yog li ntawd, nyob rau hauv kev siv tswv yim, pH tus nqi ntawm cov tshuaj yuav tsum tau tswj thiab tswj nyob rau hauv lub ruaj khov ntau yam ntawm HPMC (feem ntau pH 3-11) los xyuas kom meej nws thickening nyhuv.Piv txwv li, hauv cov ntawv thov zaub mov, HPMC feem ntau yog siv rau hauv cov khoom noj acidic xws li yogurt thiab kua txiv hmab txiv ntoo, thiab qhov zoo tshaj plaws viscosity tuaj yeem tau los ntawm kev kho tus nqi pH.

6. Lwm yam additives
Hauv cov tshuab emulsion, viscosity ntawm HPMC kuj tuaj yeem hloov kho los ntawm kev ntxiv lwm cov thickeners lossis cov kuab tshuaj.Piv txwv li, ntxiv qhov tsim nyog ntawm cov ntsev inorganic (xws li sodium chloride) tuaj yeem ua kom cov viscosity ntawm HPMC tov;Thaum ntxiv cov kuab tshuaj organic xws li ethanol tuaj yeem txo nws cov viscosity.Tsis tas li ntawd, thaum siv ua ke nrog lwm cov thickeners (xws li xanthan gum, carbomer, thiab lwm yam), viscosity thiab stability ntawm emulsion kuj tuaj yeem txhim kho tau zoo.Yog li ntawd, nyob rau hauv cov qauv tsim, tsim nyog additives yuav raug xaiv raws li xav tau los optimize lub viscosity thiab kev ua tau zoo ntawm lub emulsion.

HPMC tuaj yeem ua tiav kev tswj hwm ntawm emulsion viscosity los ntawm nws cov qauv molecular, kev siv concentration, kev sib cais, qhov kub thiab txias, pH tus nqi thiab cov khoom ntxiv.Hauv kev siv cov tswv yim, cov yam ntxwv no yuav tsum tau txiav txim siab zoo los xaiv HPMC yam tsim nyog thiab kev siv cov xwm txheej kom ua tiav qhov zoo tshaj plaws thickening nyhuv.Los ntawm kev tsim qauv tsim qauv thiab kev tswj xyuas cov txheej txheem, HPMC tuaj yeem ua lub luag haujlwm tseem ceeb hauv kev tsim kho, tshuaj, khoom noj thiab tshuaj txhua hnub, muab kev ua tau zoo thiab cov neeg siv kev paub dhau los.