HydroxyPropyyl methylcellulose (HPMC)yog cov polymer composed dav siv hauv cov ntaub ntawv hauv tsev, tshwj xeeb tshaj yog nyob rau hauv kev tsim cov tshuaj khib ntub. Nws muaj dej zoo khaws cia, thickening cov khoom, txhim kho kev tsim kho kev tsim kho thiab lwm yam ntxwv, thiab tuaj yeem txhim kho qhov kev ua tau zoo ntawm cug.
1. Txhim Kho Cov Dej Ua Haujlwm
HPMC muaj cov dej pheebs dej muaj zog, uas tuaj yeem txhim kho cov dej khaws cia ntawm ntub dej ntawm cov tshuaj khib nyiab ntub. Thaum lub sij hawm tsim kho, poob sai sai sai sai tuaj yeem ua rau lub cug ua kom tawg thiab tawg, txo nws txoj kev sib khi nrog lub substrate. Tom qab ntxiv tus nqi tsim nyog ntawm HPMC, cov network tuab tuaj yeem tsim nyob rau hauv kev ya thiab tiv thaiv kev siv lub sijhawm qhib thiab lub sijhawm ua haujlwm ntawm lub tshuaj khib. Ib qho ntxiv, cov dej siab kom siab kom ntseeg tau tias cov xis mas hydrated, yog li kev txhim kho lub zog tom qab ntawm lub cug.
2. Txhim Kho Kev Ua Haujlwm
Qhov ua haujlwm ntawm cov tshuaj khib ntub yog qhov taw qhia tseem ceeb ntawm kev tsim kho kev tsim kho, suav nrog nws cov kua dej, cov yuag thiab ua haujlwm. Vim tias nws cov nyhuv thickening, HPMC tuaj yeem txhim kho cov tshuaj cug thiab nplaum ntawm cug thiab tusyees npog qhov ntev ntawm substrate. Nyob rau tib lub sijhawm, nws kuj tuaj yeem txo cov delamination thiab los ntshav ntawm kev tshuaj khib thiab ua kom muaj kev sib xyaw ua ke hauv kev tsim kho. Qhov kev txhim kho no tsis tuaj yeem tsuas yog txo cov qauv kev tsim qauv, tab sis kuj tseem txhim kho cov nplaum ntawm lub tshuaj khib thiab cov khoom siv hauv paus thiab txhim kho cov khoom tsim tau zoo.
3. Txhim kho Sag Kuj
Hauv kev tsim kho ntsug, tshuaj khib yog nquag nquag ua rau sagging, uas cuam tshuam rau cov ntawv thov siv cov nyhuv thiab kev tsim kho. Cov nyhuv tuab ntawm HPMC tuaj yeem nce cov txiaj ntsig kev ntxhov siab ntawm lub tshuaj khib, ua rau nws tiv taus sagging hauv cov kev coj ntsug. Tshwj xeeb tshaj yog thaum ua ntawv thov cov txheej txheem cug tuab, HPMC tuaj yeem tswj hwm lub tshuaj khib thiab txo qhov kev pheej hmoo ntawm cov tshuaj khib nyiab mus tom qab kev tsim kho. Ib qho ntxiv, lub thixotropy ntawm HPMC tso cai rau lub viscosity nyob rau hauv lub xeev zoo li qub thiab nthuav tawm cov hmoov zoo li qub thaum raug txhim kho sab nraud, ntxiv txhim kho kev ua haujlwm.
4. Txhim Kho Cov Khoom Siv Cov Neeg Kho
Txawm yogHPMCTsuas yog ntxiv ua qhov hloov kho nrog qhov tsawg tsawg, nws tseem muaj qee yam cuam tshuam rau ntawm cov khoom siv tshuab ntawm lub tshuaj khib. Tus nqi HPM tsim nyog yuav pab txhim kho cov kab cug tua kab cug vim tias nws cov nyhuv khaws dej tuaj yeem txo qhov kev ua kom qhuav. Ib qho ntxiv, vim nws txoj kev txhim kho hauv microstructure ntawm lub tshuaj khib, lub tensile lub zog thiab roj zog ntawm lub tshuaj khib kuj tseem ua tau zoo dua. Txawm li cas los xij, nws yuav tsum raug sau tseg tias ntau dhau ntawm HPMC tuaj yeem ua rau muaj cov kab tshuaj khib nyiab ntawm lub tshuaj khib thiab tsis muaj zog ntawm kev sib xyaw ntawm lub tshuaj khib. Yog li, tus nqi ntxiv yuav tsum nruj me ntsis tswj thaum siv HPMC, feem ntau 0.1% -0.3% ntawm cov xis mas.
5. Raug cuam tshuam txog cov ntsiab lus thiab kev ua kom zoo dua
Cov cawv ntawm HPMC ntawm cov khoom ntawm ntub-mak cug yuav cuam tshuam zoo rau nws txoj kev molecular, degree hloov chaw thiab ntxiv tus nqi. High molecular hnyav HPMC muaj cov nyhuv tuab tuab, tab sis tej zaum yuav muaj kev tsis zoo rau kev tsim kho; Tsawg molecular hnyav HPMC yog ntau soluble thiab haum rau cov kev xav tau kev tsim kho sai sai. Tsis tas li ntawd, HPMC nrog cov qib sib txawv ntawm kev hloov pauv kuj muaj kev ua tau zoo hauv dej tuav thiab nplaum. Hauv kev siv cov kev siv, hom HPMC yog tsim nyog tau xaiv raws li cov kev sim ua kom zoo dua los ntawm kev sim ua kom tiav ntawm kev ua tau zoo thiab raug nqi.
Raws li ib qho tseem ceeb admixture nyob rau hauv ntub-mix cug,HPMCMuab kev txhawb nqa rau kev txhim kho tag nrho ntawm cov tshuaj khib nyiab los ntawm kev nce dej khaws cia los ntawm kev ua haujlwm kom ua haujlwm, txhim kho cov khoom lag luam tsis kam thiab ua kom zoo dua qub cov khoom. Kev xaiv tsim nyog thiab kev siv HPMC tsis tuaj yeem txhim kho kev ua haujlwm zoo thiab kav kuj txo kev tsim kho kev tsim kho thiab txo tus nqi kho mob. Yog li ntawd, nyob rau hauv-kev kawm tob txheej ntawm HPMC ntawm kev ua yeeb yam ntawm kev sib xyaw ua ke yog qhov tseem ceeb ntawm cov haujlwm niaj hnub.
Sijhawm Sijhawm: NOV-20-2024