HydroxyPropyyl methylcellose (HPMC) yog ib qho tseem ceeb ntawm lub luag haujlwm hauv kev sib xyaw ua ke hauv cov khoom lag luam tsis zoo, txhim kho lawv cov peev txheej.
1. Txhim kho dej ua ke
Dej khaws cia yog qhov taw qhia tseem ceeb ntawm tshuaj khib. Nws hais txog cug lub peev xwm ua rau muaj kev ya raws ua ntej tawv tawv. HPMC muaj cov dej siab khaws cia, uas yog feem ntau vim yog cov pab pawg hydrophilic ntawm hydroxypropyl thiab methyl pawg nyob rau hauv nws cov qauv molecular. HPMC tuaj yeem tsim ib zaj duab xis nyias nyob rau hauv lub tshuaj khib nyiab kom qeeb evaporation ntawm dej, yog li ua kom pom tseeb tias lub tshuaj khib nyob twj ywm rau lub sijhawm ntev dua. Cov yam ntxwv no tshwj xeeb yog qhov tshwj xeeb yog qhov chaw sov lossis qhuav thiab poob ntawm kev ua kom muaj dej huv ntawm lub cug.
2. Txhim kho cov khoom lag luam
Kev tsim kho kom yog hais txog kev ua haujlwm, ua haujlwm thiab lub meej cug. HPMC tuaj yeem txhim kho kev tsim kho cov kev tsim kho ntawm cov khoom siv sib xyaw qhuav-tov cov tshuaj khib nyiab, ua kom yooj yim rau kev thov thiab du. Cov kev ua tau zoo yog:
Thickening cov nyhuv: HPMC muaj cov nyhuv tuab, uas tuaj yeem hloov kho lub colut kom ua rau nws tsis tshua pom zoo los tswj cov kev tsim kho.
Lubrication nyhuv: HPMC tuaj yeem ua kom muaj zog ntawm cug, ua cov tshuaj khib smoother thaum kev tsim kho thiab txo cov cuab yeej thiab cov ntaub ntawv.
Kev Ua Haujlwm Kev Ua Tau Zoo: HPMC txhim kho txoj kev sib raug zoo ntawm cov tshuaj khib thiab cov khoom siv los tiv thaiv npleem lossis poob thaum tsim khoom.
3. Txhim Kho Sag Kuj
Sag tiv thaiv yog hais txog lub peev xwm ntawm collch kom tiv taus ntws thiab ntog thaum lub sijhawm ua kev tsim kho. Los ntawm kev nce viscosity thiab sab hauv cov qauv kev ruaj ntseg ntawm lub cug tshuaj khib, hpmc tuaj yeem tswj tau tus txheej txheem zoo dua thaum ua ntawv thov rau cov kab ntsug thiab yuav tsis sag yooj yim. Qhov no yog qhov tshwj xeeb tshaj yog rau kev tsim kho ntawm phab ntsa phab ntsa sab nrauv thiab cov txheej txheem plug, raws li nws tuaj yeem txo cov kuab tshuaj qeeb qeeb thiab txhim kho kev tsim kho.
4. Txhim kho cov sijhawm ua haujlwm
HPMC tuaj yeem txuas lub sijhawm qhib thiab kho kom haum ntawm cov neeg ua haujlwm siv sijhawm ntau dua los hloov kho thiab hloov kho thaum lub sijhawm tsim kho. Lub sijhawm qhib kev txuas ntxiv ntawm cov haujlwm txuas ntxiv ntawm cov chaw siv ntau yam tsis cuam tshuam rau lub cev ua kom zoo tshaj plaws ntawm lub cug.
5. Txhim kho kev tiv thaiv kev tawm tsam
Tshuaj khib yuav txiav rau qee yam thaum lub sij hawm ua kom tawv nqaij tawv. HPMC qeeb qeeb ntawm cov dej khiav los ntawm nws cov khoom siv dej kom tsis txhob ua haujlwm, yog li txo cov shrinkage qhuav thiab deformation. Tsis tas li ntawd, cov polymer network tsim los ntawm HPMC tuaj yeem ua lub luag haujlwm yog qee yam kev ntxhov siab, thiab txo qhov kev ntxhov siab, thiab txo qhov kev ntxhov siab, thiab txo qhov kev ntxhov siab ntawm cov kab cug tom qab ziab.
6. Txhim Kho Kom Khib-Thaw Kuj
Khov-thaw tsis kam lees txog kev muaj peev xwm ua tau zoo ntawm kev ua tau zoo tom qab ntsib ntau qhov chaw khov-thaw mus. HPMC txhim kho lub khov-thaws tiv thaiv lub micrch los ntawm kev txhim kho microstructure ntawm cug cug ua kom lub pore faib cov khaub ncaws ntau dua. HPMC muaj cov dej ruaj khov, uas tuaj yeem txo cov dej sib cais, txo cov dej sab hauv los ntawm cov dej khov kho thiab nthuav dav dej, thiab tiv thaiv kom tsis txhob khov-thaws kev puas tsuaj.
7. Nce hnav tsis kam
Hnav tsis kam lees txog lub peev xwm ntawm lub tshuaj khib saum npoo los tiv thaiv kev sib txhuam thiab hnav thaum siv. Zaj duab xis zoo li cov qauv tsim los ntawm HPMC nyob rau hauv cug tshuaj yuav nce ntxiv rau qhov ntom ntom thiab hardness ntawm lub tshuaj khib sab saum toj, yog li kev txhim kho nws cov kev coj ua. Qhov no yog qhov tshwj xeeb tshaj yog nyob rau hauv cov ntawv thov xws li phab ntsa sab nrauv thiab sab nrauv phab ntsa cladding uas yog yuav ua kom sib txhuam siab.
HydroxyPropyyl methylcellose (HPMC) tau txhim kho cov dej ua haujlwm, thiab kev tawm tsam cov dej sib xyaw, cov dej tsis yeem ntawm nws cov dej ua haujlwm, cov khoom siv tuab, thiab cov khoom siv lubrication. Khov-thaws muaj peev xwm thiab ua tsis taus. Cov kev txhim kho no tsis yog txhim kho cov kev tsim kho zoo thiab cov kav cug, tab sis kuj txhim kho kev ua haujlwm tau zoo thiab yooj yim thiab yooj yim. Yog li ntawd, daim ntawv thov ntawm HPMC hauv kev sib xyaw qhuav-sib xyaw-kab cug ua haujlwm tseem ceeb ntawm cov ntaub ntawv tsim tsev.
Lub Sijhawm Post: Feb-17-2025