HydroxyPropyyl methylcellulose (HPMC)yog cov dej-soluble cov khoom siv polymer porymer siv hauv cov tshuaj, kev tsim kho, khoom noj, cov tshuaj pleev zaub mov thiab lwm thaj teb. Nws cov cuab yeej viscosity yog qhov tseem ceeb ntsuas kom ntsuas nws tus cwj pwm txawv nyob hauv ib puag ncig sib txawv. Nkag siab txog cov cuab yeej viscosity ntawm HPMC aqueous kev daws yuav pab peb to taub zoo dua nws tus cwj pwm thiab muaj nuj nqi hauv ntau yam kev siv.
1. Cov qauv tshuaj lom neeg thiab cov khoom ntawm HPMC
HPMC tau txais los ntawm kev hloov kho tshuaj lom neeg ntawm cov cellulose ntuj, feem ntau yog tsim los ntawm hydroxyprropation thiab methylation ntawm cellulose molecules. Nyob rau hauv cov qauv tshuaj ntawm HPMC, cov lus qhia ntawm methyl (-chiv) thiab hydroxypropyl (-och₂hoh₃) Lub viscosity kev ua tau zoo ntawm nws cov kua afousous ntawm ntau qhov ntau thiab qhov kub thiab txias tau cuam tshuam los ntawm ntau yam xws li kev hnyav molecular, degree hloov chaw, thiab lwm yam.
2. Kev sib raug zoo ntawm viscosity thiab conferration
Lub viscosity ntawm disderincel ®hpmc aqueous daws feem ntau nce nrog nce kev ua kom nce siab. Qhov no yog vim tias ntawm cov kev cuam tshuam ntau dua, kev sib cuam tshuam ntawm cov lwg me me yog txhim kho, ua rau muaj kev nce ntxiv. Txawm li cas los xij, lub solubility thiab voscosity HPMC hauv dej kuj tseem cuam tshuam los ntawm molecular hnyav. HPMC nrog cov molecular hnyav feem ntau yog cov khoom pov thawj loj dua, thaum lub cev qis dua yog tsawg.
Ntawm cov kev ua kom muaj zog: HPMC kev daws teeb meem kev ua yeeb yam qis ntawm cov qis dua ntawm cov qis dua (xws li hauv qab 0.5%). Nyob rau lub sijhawm no, kev sib cuam tshuam ntawm cov lwg me me tsis muaj zog thiab cov kua txiv yog qhov zoo. Nws feem ntau yog siv rau hauv cov ntawv thov xws li cov txheej txheem thiab cov tshuaj tso tawm.
Ntawm cov kev muaj zog: nyob rau ntau dua qib siab (xws li 2% lossis siab dua), lub viscos aqueous nce siab, qhia cov khoom zoo ib yam li kev daws teeb meem colloidal. Nyob rau lub sijhawm no, lub fluidity ntawm txoj kev daws teeb meem yog raug rau ntau dua kev tiv taus ntau dua.
3. Kev sib raug zoo ntawm viscosity thiab kub
Lub viscosity ntawm HPMC aqueous kev daws teeb meem rhiab heev. Raws li qhov ntsuas kub nce ntxiv, qhov txav ntawm cov dej lwg me me nce, thiab kev sib cuam tshuam ntawm HPMC lwg me me ua rau muaj zog, ua rau muaj kev txo qis hauv viscosity. Cov yam ntxwv no ua rau HPMC ntawm ntau qhov kub thiab txias qhia tau muaj zog. Piv txwv li, hauv qab cov kev mob siab, lub viscosity ntawm HPMC feem ntau muaj nyob hauv cov ntaub ntawv tso tawm, qhov twg yog qhov kev hloov pauv ntawm qhov ruaj khov thiab cuam tshuam ntawm kev daws teeb meem.
4. Cov nyhuv ntawm viscosity
Lub viscosity ntawm HPMC aqueous kev daws yuav tseem yuav cuam tshuam los ntawm PHU ntawm kev daws teeb meem. Txawm hais tias HPMC yog cov tshuaj tsis-ionic, nws cov khoom siv hydrophilicity thiab viscosity cov khoom yog feem ntau cuam tshuam los ntawm cov qauv molecular thiab kev daws teeb meem. Txawm li cas los xij, nyob rau hauv cov pa qaub tsis tshua muaj, cov solubility, cov qauv ua haujlwm thiab cov qauv molecular ntawm HPMC tuaj yeem hloov pauv, yog li cuam tshuam lub viscosity. Piv txwv, nyob rau hauv acidic tej yam kev mob, lub solubility ntawm HPMC tej zaum yuav tsis muaj zog me ntsis, ua rau muaj viscosity ntau ntxiv, Thaum nyob rau hauv Alkaline tej yam kev mob, cov hydrolysis ntawm qee HPMC yuav ua rau nws lub cev hnyav molecular kom txo qis, yog li txo nws viscosity.
5. Molecular hnyav thiab viscosity
Molecular qhov hnyav yog ib qho tseem ceeb rau kev cuam tshuam rau cov viscosity ntawm HPMC aqueous daws. Qhov hnyav dua nce ntxiv cov entanglement thiab hla kev sib txuas ntawm cov lwg me me, ua rau muaj viscosity ntau ntxiv. Low molecular hnyav txhawj xeeb txhawj xeeb ®hpmc muaj solubility zoo dua hauv dej thiab qis viscosity. Cov kev thov sib txawv feem ntau yuav tsum tau xaiv HPMC nrog hnyav molecular hnyav. Piv txwv li, hauv cov txheej txheej thiab cov nplaum nplaum, siab molecular hnyav HPMC feem ntau raug xaiv rau kev ua yeeb yam zoo dua qub thiab fluidity; Thaum nyob rau hauv kws tshuaj npaj, lub cev hnyav HPMC yuav siv tau los tswj cov tshuaj tso tawm.
6. Kev sib raug zoo ntawm Shear tus nqi thiab viscosity
Lub viscosity ntawm HPMC aqueous daws feem ntau hloov nrog shear tus nqi, qhia raug pseudoplastic rheological coj cwj pwm. Pseudoplastic kua yog cov kua uas nws viscosity maj mam txo qis nrog qhov nce ntawm shear tus nqi. Tus xeeb ceem no pab tau cov tshuaj hpmc kom muaj lub viscosity siab nyob ntawm cov neeg viscosity siab thaum ua ntawv thov, thiab txhim kho cov flue flue. Piv txwv li, hauv kev lag luam txheej, kev daws teeb meem HPMC feem ntau yuav tsum tau ua kom muaj qhov sib txawv ntawm cov txheej txheem, thaum lub sijhawm tsim qauv, nws yog qhov tsim nyog los ua kom cov shear tus nqi kom nws haus dej ntau dua.
7. Daim Ntawv Thov thiab Viscosity Cov yam ntxwv ntawm HPMC
Cov yam ntxwv viscosity ntawmHPMCUa kom nws dav siv nyob rau hauv ntau thaj teb. Piv txwv li, hauv kev lag luam hauv chaw muag tshuaj, HPMC muaj cov tshuaj tiv thaiv-tso tawm, thiab nws cov kev cai viscosity siv los tswj cov tshuaj tso tawm; Hauv kev tsim kho kev tsim kho, HPMC yog siv los ua cov tuab los txhim kho kev ua haujlwm thiab fluidity ntawm tshuaj khib thiab cov nplaum; Hauv kev lag luam khoom noj khoom haus, HPMC tuaj yeem siv los ua cov thickener, emulsifier thiab stabilizer kom txhim kho cov saj thiab tsos khoom noj.
Tus yam ntxwv viscosity of diserionincel ®hpmc aqueous daws yog tus yuam sij rau nws daim ntawv thov nyob rau ntau daim teb. Nkag siab txog nws txoj kev sib raug zoo nrog cov yam ntxwv xws li kev xav tau, qhov kub, Ph, cov siab tawv yog qhov tseem ceeb rau kev ua haujlwm zoo thiab txhim kho cov ntawv thov.
Lub Sijhawm Post: Jan-27-2025