HPMC (hydroxypropyl methylcellulose) yog cov khoom siv polymer uas yaj tau hauv dej thiab siv dav hauv kev tsim kho, tshuaj, khoom noj thiab tshuaj txhua hnub. Nws muaj cov khoom zoo uas ua rau tuab, emulsification, tsim zaj duab xis, tiv thaiv colloid thiab lwm yam. Hauv cov txheej txheem emulsion, HPMC tuaj yeem tswj qhov viscosity ntawm emulsion hauv ntau txoj kev.
1. Cov qauv molecular ntawm HPMC
Qhov 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 solubility thiab viscosity ntawm HPMC. Tshwj xeeb, qhov siab dua qib ntawm kev hloov pauv, qhov zoo dua qhov dej solubility ntawm HPMC, thiab viscosity nce raws li. Cov chaw tsim khoom feem ntau muab cov khoom HPMC nrog cov qhov hnyav molecular sib txawv thiab qib ntawm kev hloov pauv kom tau raws li qhov xav tau ntawm cov ntawv thov sib txawv.
2. Siv kev tsom xam
Qhov concentration ntawm HPMC hauv cov kua dej yog ib qho ntawm cov yam tseem ceeb uas cuam tshuam rau viscosity. Feem ntau hais lus, qhov concentration ntawm HPMC siab dua, qhov viscosity ntawm cov kua ntau dua. Txawm li cas los xij, qhov viscosity ntawm ntau hom HPMC ntawm tib qhov concentration tuaj yeem sib txawv ntau heev. Yog li ntawd, hauv kev siv ua haujlwm, nws yog qhov tsim nyog los xaiv qhov concentration tsim nyog ntawm HPMC kua raws li qhov xav tau viscosity tshwj xeeb. Piv txwv li, hauv kev siv hauv kev tsim kho, qhov concentration ntawm HPMC feem ntau yog tswj hwm ntawm 0.1% thiab 1% kom muab viscosity ua haujlwm thiab kev ua haujlwm hauv kev tsim kho.
3. Txoj kev yaj
Cov txheej txheem yaj ntawm HPMC kuj muaj qhov cuam tshuam tseem ceeb rau qhov viscosity kawg. HPMC yooj yim rau disperse hauv dej txias, tab sis qhov nrawm dissolving qeeb; nws yaj sai hauv dej kub, tab sis nws yooj yim rau agglomerate. Yuav kom tsis txhob agglomeration, txoj kev ntxiv maj mam tuaj yeem siv, uas yog, ua ntej maj mam ntxiv HPMC rau hauv dej txias kom disperse, tom qab ntawd cua sov thiab do kom txog thaum yaj tag. Tsis tas li ntawd, HPMC kuj tseem tuaj yeem premixed nrog lwm cov hmoov qhuav thiab tom qab ntawd ntxiv rau hauv dej kom yaj kom txhim kho kev ua haujlwm yaj thiab viscosity stability.
4. Kub
Kub muaj feem cuam tshuam loj rau qhov viscosity ntawm HPMC cov tshuaj. Feem ntau, qhov viscosity ntawm HPMC cov tshuaj txo qis thaum qhov kub nce. Qhov no yog vim tias qhov kub nce siab yuav ua rau lub zog hydrogen sib txuas ntawm cov molecules tsis muaj zog, ua rau HPMC molecular saw yooj yim dua, yog li txo qhov viscosity ntawm cov tshuaj. Yog li ntawd, hauv cov ntawv thov uas xav tau viscosity siab, HPMC cov tshuaj feem ntau siv rau qhov kub qis dua. Piv txwv li, hauv cov ntawv thov tshuaj, HPMC cov tshuaj feem ntau siv rau qhov kub thiab txias hauv chav tsev kom ntseeg tau tias cov tshuaj ruaj khov thiab ua haujlwm tau zoo.
5. Tus nqi pH
Qhov viscosity ntawm HPMC kua kuj raug cuam tshuam los ntawm pH tus nqi. HPMC muaj viscosity siab tshaj plaws nyob rau hauv qhov nruab nrab thiab tsis muaj zog acidic tej yam kev mob, thaum lub viscosity yuav txo qis ntau nyob rau hauv muaj zog acidic lossis alkaline tej yam kev mob. Qhov no yog vim tias cov nqi pH siab heev yuav rhuav tshem cov qauv molecular ntawm HPMC thiab ua rau nws cov thickening effect tsis muaj zog. Yog li ntawd, hauv kev siv ua haujlwm, tus nqi pH ntawm cov kua yuav tsum tau tswj thiab tswj hwm hauv qhov ruaj khov ntawm HPMC (feem ntau pH 3-11) kom ntseeg tau tias nws cov thickening effect. Piv txwv li, hauv kev siv zaub mov, HPMC feem ntau siv rau hauv cov zaub mov acidic xws li yogurt thiab kua txiv hmab txiv ntoo, thiab qhov viscosity zoo tagnrho tuaj yeem tau txais los ntawm kev kho tus nqi pH.
6. Lwm yam khoom ntxiv
Hauv cov txheej txheem emulsion, qhov viscosity ntawm HPMC kuj tseem tuaj yeem hloov kho los ntawm kev ntxiv lwm cov thickeners lossis cov kuab tshuaj. Piv txwv li, ntxiv cov ntsev inorganic kom tsim nyog (xws li sodium chloride) tuaj yeem ua rau kom viscosity ntawm HPMC kua; thaum ntxiv cov organic solvents 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), qhov viscosity thiab kev ruaj khov ntawm emulsion kuj tuaj yeem txhim kho tau zoo heev. Yog li ntawd, hauv kev tsim cov mis tiag tiag, cov khoom ntxiv tsim nyog tuaj yeem xaiv raws li qhov xav tau los ua kom zoo dua qhov viscosity thiab kev ua tau zoo ntawm emulsion.
HPMC tuaj yeem ua tiav kev tswj hwm qhov tseeb ntawm emulsion viscosity los ntawm nws cov qauv molecular, kev siv concentration, txoj kev yaj, kub, pH tus nqi thiab cov khoom ntxiv. Hauv kev siv ua haujlwm, cov yam no yuav tsum tau txiav txim siab kom meej kom xaiv hom HPMC thiab cov xwm txheej siv kom ua tiav qhov thickening effect zoo tagnrho. Los ntawm kev tsim cov mis tshuaj thiab kev tswj 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 heev thiab kev paub dhau los ntawm tus neeg siv.
Lub sijhawm tshaj tawm: Lub Xya Hli-17-2024