HydroxyPropyyl methylulose (HPMC) yog cov hluavtaws semi-inert, tsis muaj kuab-soluble-solub-solub-solub-solub siv nyob rau hauv kev lag luam xws li tshuaj, zaub mov pleev thiab khoom siv tsev. Qhov kev sib raug zoo ntawm nws cov molecular hnyav thiab viscosity muaj qhov cuam tshuam tseem ceeb ntawm nws qhov kev ua tau zoo hauv ntau yam kev siv.
1. Solubility thiab Film-Forming Khoom
Lub viscosity ntawm HPMC ncaj qha cuam tshuam rau nws solubility hauv dej. HPMC nrog qis viscosity tuaj yeem yaj hauv dej sai dua thiab ua kom haum rau cov ntaub ntawv uas xav tau cov khoom siv nrawm dua, xws li cov tshuaj ntsuab nrawm lossis nrawm nrawm. HPMC nrog lub sijhawm viscosity ntau dua, tab sis tuaj yeem muab cov thickness ntxiv thiab muaj zog thaum tsim zaj duab xis, yog li nws yog qhov ua yeeb yaj kiab matrix nyob rau hauv kev tsim tawm-tso tawm.
2. Kev ruaj khov thiab adhesion
HPMC nrog cov viscosity ntau dua feem ntau muaj cov ruaj khov ruaj khov thiab cov nplaum. Piv txwv li, thaum siv los ua cov ntaub tuab rau cov txiv duaj lossis cov khoom lag luam gypsum tau txhim kho, kev tiv thaiv kom ntev, txo qis kev tsim kho lub sijhawm tsim kho thiab txo cov kev tawg. Hauv kev lag luam kws tshuaj, qib siab-viscosity HPMC yog siv los tswj cov tshuaj tso tawm tshuaj. Nws cov khoom zoo rau cov tshuaj yuav tsum tau tso tawm maj mam hauv lub cev thiab txhim kho cov xyoob ntoo ntawm cov tshuaj.
3. Ncua thiab Emulsification
Kev hloov pauv hauv viscosity kuj tseem cuam tshuam rau kev ncua thiab emulsification muaj zog ntawm HPMC. Vim nws cov lus luv luv thiab cov kab hlau luv luv, qis-viscosity HPMC yog qhov tsim nyog rau kev siv raws li kev ncua tus neeg sawv cev. Nws muaj peev xwm ua kom tsis txhob ncua kev sib cais hauv cov tshuaj ua kua thiab tiv thaiv nag lossis daus. HPMC nrog cov qauv viscosity siab tuaj yeem ua tus qauv muaj zog hauv kev daws teeb meem vim nws qhov kev ruaj khov thiab muaj peev xwm tswj tau cov kev sib tw tau ntev.
4. Rheology thiab thov cov khoom
Rheological cov yam ntxwv ntawm HPMC kuj yog qhov tseem ceeb tshaj plaws cuam tshuam los ntawm viscosity. Cov kev daws teeb meem qis HPMC tsis zoo Cov tshuaj zoo dua, yog qhov yooj yim rau tshuaj tsuag thiab siv tau hauv cov khoom saib xyuas cov tawv nqaij thiab cov xim pleev xim rau. Lub siab-viscosity HPMC kev coj ua raws li cov kua tsis yog-Newtonian thiab muaj cov yam ntxwv shear-thev. Cov xeeb ceem no ua rau muaj visccccos yooj yim dua los daws cov neeg viscosity high, li kev tswj hwm qhov kev ua yeeb yam siab, yog li kev txhim kho zaj duab xis-ua thiab ruaj khov ntawm cov khoom.
5. Thov cov piv txwv
Cov chaw muag tshuaj: qis-viscosity HPMC (xws li li 50 CPS) kom paub cov ntsiav tshuaj sai, thaum muaj cov ntsiav tshuaj tawm sai dua los kho cov Tus nqi tso yeeb tshuaj.
Khoom noj khoom haus: hauv kev haus zaub mov sai, qis-viscosity HPMC tuaj yeem yaj sai tsis muaj clumping; Nyob rau hauv cov khoom ci, cov siab-viscosity HPMC tuaj yeem txhim kho cov dej tuav tau muaj peev xwm ntawm cov khob noom cookie thiab txhim kho cov saj thiab noo cov khoom ntawm cov khoom ci.
Kev tsim kho cov teb: hauv cov putties thiab txheej, qis-viscosity HPMC pab txhawb kev ua haujlwm thiab txhim kho kev ua haujlwm ua haujlwm; Thaum lub siab-viscosity HPMC txhim kho cov tuab thiab sag tiv taus ntawm txheej.
Lub viscosity ntawm HPMC yog tus yuam sij uas txiav txim nws cov kev ua tau zoo hauv kev siv. Tsis muaj viscosity HPMC feem ntau yog siv qhov twg nrawm dua ntawm cov ntawv thov, thaum lub siab viscesion, zoo zaj duab xis tsim thiab ruaj khov. Yog li, xaiv HPMC nrog txoj cai viscosity yog qhov tseem ceeb rau kev ua kom zoo rau nws cov kev ua tau zoo hauv ntau thaj teb.
Lub Sijhawm Post: Jul-08-2024