HydroxyPropyyl Metylcellulose (HPMC) yog cov cellle, kua dej-soluble cellulose nrog ntau cov ntawv thov hla ntau yam kev lag luam vim nws cov khoom lag luam txawv teb chaws. Cov polymer no tau muab los ntawm cellulose, lub ntuj huv, los ntawm kev hloov kho tshuaj lom neeg muaj feem cuam tshuam nrog methylation thiab hydroxyproper. Lub txiaj ntsig HPMC cov khoom ua pov thawj ntawm cov khoom ntawm cov khoom los ntawm nws cov khoom pauv, ua rau nws muaj txiaj ntsig zoo hauv ntau cov qauv.
Rheological cov khoom ntawm HPMC
1. Viscosity thiab gelation:
HPMC muaj kev paub zoo rau nws lub peev xwm los tsim cov kev daws teeb meem hauv dej, txawm tias muaj qhov ntau ua kom muaj ntau. Lub tshuaj tua ntawm HPMC yog nyob ntawm ntau yam, suav nrog cov molecular hnyav, siab, thiab cov degree ntawm kev hloov methyl thiab hydroxypropropyl pawg. Feem ntau, hnyav dua siab thiab ntau dhau los ua rau viscosities ntau dua. Ib qho ntawm cov khoom zoo tshaj plaws ntawm HPMC yog nws cov remersible thermal gelation. Thaum muaj cua sov, aqueous HPMC cov ntsiab lus hu rau kev hloov pauv ntawm sol (kua) rau ib gel (khoom) lub xeev. Qhov kev nkag siab no tau thim rov qab, nrog cov gel rov qab mus rau ib lub xeev sol thaum cua txias. Cov cuab yeej tshwj xeeb no yog muaj txiaj ntsig tshwj xeeb hauv cov ntawv thov uas xav tau qhov ntsuas kub-rhiab hloov.
2. Thixotropy thiab shear-thinning tus cwj pwm:
HPMC cov kev daws teeb meem shear-thinning tus cwj pwm, lub ntsiab lus lawv viscosity txo qis nrog nce shear tus nqi. Qhov kev coj tsis yog-Newtonian tau txais txiaj ntsig zoo hauv cov ntawv thov uas yooj yim ntawm kev thov thiab ruaj khov nyob rau hauv cov xwm txheej zoo li qub. Ib qho ntxiv, HPMC qhia tawm Thixotrotropy, qhov twg lub viscosity ably txo dhau lub sijhawm tab sis rov qab thaum lub shear raug tshem tawm. Cov yam ntxwv rheatorical ua HPMC haum rau cov qauv uas yuav tsum tau thov kom du thiab ruaj khov.
3. Zaj duab xis-tsim muaj peev xwm:
HPMC tuaj yeem sau hloov pauv hloov thiab pob tshab cov yeeb yaj kiab, uas yog qhov zoo hauv ntau daim ntawv thov txheej. Zaj duab xis-ua cov cuab yeej yog cuam tshuam los ntawm cov polymer cov molecular hnyav thiab kev xav tau, nrog rau cov kev mob ziab. HPMC cov yeeb yaj kiab feem ntau siv nyob rau hauv cov txheej txheem caposultical, ntim khoom noj, thiab cov khoom siv khoom siv vim lawv cov khoom tiv thaiv thiab thaiv cov khoom tiv thaiv.
Cov ntawv thov ntawm HPMC
1. Kev lag luam:
HPMC muaj kev lag luam dav nyob hauv kev lag luam kws tshuaj vim nws cov biocompatibility thiab tsis muaj tshuaj lom. Nws pabcuam ntau lub luag haujlwm, suav nrog cov phau ntawv hauv cov ntsiav tshuaj, tus tswj hwm kev tswj hwm hauv cov khoom siv tshuaj, thiab ib zaj yeeb yaj kiab-yav dhau los rau txheej. Hauv kev tswj hwm-tso tawm, HPMC cov kev ua kom muaj peev xwm ua kom muaj kev sib raug zoo nyob rau lub sijhawm, txhim kho tshuaj kev ua haujlwm thiab tus neeg mob ua tsis tiav. Tsis tas li ntawd, HPMC tau ua haujlwm ua tus neeg sawv cev tuab tuab hauv cov ntsiab lus, muab cov kev xav tau zoo sib xws thiab ruaj khov.
2. Kev lag luam khoom noj:
Hauv kev lag luam khoom noj, HPMC yog siv los ua cov tuab dua, emulsifier, thiab stabilizer. Nws txhim kho cov qauv thiab kev ruaj khov ntawm ntau yam khoom noj khoom noj, suav nrog cov kua ntses, hnav khaub ncaws, thiab cov khoom ci. HPMC lub peev xwm los ua cov tshuaj pleev thiab cov yeeb yaj kiab yog muaj txiaj ntsig tshwj xeeb hauv Gluten-dawb Viscoelastic Cov Khoom Siv ntawm Gluten, uas yog kev txhim kho cov qauv thiab ntim ntawm cov khoom kawg. Tsis tas li ntawd, HPMC tuaj yeem txhim kho lub neej ntawm lub neej thiab noo noo kom muaj cov khoom noj.
3. Kev lag luam kev tsim kho:
HPMC tau siv dav hauv kev tsim kho kev tsim kho, tshwj xeeb hauv kev tso cai cov khoom noj thiab cov txheej txheem txheej txheem. Nws ua raws li dej rov qab tus neeg saib xyuas, txhim kho cov haujlwm ua haujlwm thiab cov nplaum ntawm cov khoom noj kom xis. Nyob rau hauv cov nplais nplaum, HPMC txhim kho lub sijhawm qhib thiab nyiaj txiag zog, ua kom tiav cov ntawv thov zoo dua thiab kav ntev. Nws cov khoom siv hluav taws xob tseem ua rau cov tshuaj tiv thaiv sagging ntawm Plasters thiab cov khoom siv, yooj yim ib qho thiab txawm tias thov.
4. Cov Khoom Siv Saib Xyuas Tus Kheej:
HPMC yog cov khoom siv tseem ceeb hauv ntau cov khoom siv saib xyuas koj tus kheej, suav nrog zawv plaub hau, cov khoom siv, pleev tshuaj, thiab cream. Nws ua haujlwm raws li cov tuab tuab, emulsifier, thiab stabilizer, muab qhov xav tau xav tau thiab kev ntxhib los mos rau cov qauv. Hauv cov khoom tu plaub hau, hpmc txhim kho npuas dej ruaj khov thiab muab ib tug zoo nkaus li. Nws cov yeeb yaj kiab-tsim muaj peev xwm siv tau hauv cov khoom saib xyuas tawv nqaij los tsim kev tiv thaiv tawv nqaij los tsim cov kev tiv thaiv tawv nqaij thiab txhim kho noo noo thiab noo noo noo.
5. Xim thiab txheej:
Hauv cov xim pleev xim rau kev lag luam thiab kev lag luam hpmc yog siv los ua cov qauv kev hloov kho kom tswj tau cov dej ntws thiab thov cov khoom ntawm cov dej. Nws ua kom muaj zog cov xim sib txawv dispersion, txwv tsis pub sagging, thiab txhim kho kev ruaj ntseg ntawm cov xim tsim. HPMC kuj tau txhim kho cov txhuam hniav thiab theem ntawm cov xim tha xim, ua rau muaj kev du thiab ua tiav.
6. Cov roj thiab roj kev lag luam:
HPMC yog siv nyob rau hauv cov roj thiab roj kev lag luam ua cov kua lim dej ntxiv. Nws viscosity-kho cov khoom pab pab tswj cov kua dej khov, tswj cov kua dej kom tswj tau ntawm cuttings. HPMC-based kua dej kuj tseem muab lubrication, txo kev sib txhuam thiab hnav cov khoom siv drilling.
HydroxyPropyyl Metylcellulose (HPMC) yog cov polymer ntau yam nrog cov ntawv thov dav dav vim nws cov khoom siv sib txawv. Nws lub peev xwm los tsim cov kev daws teeb meem, ua kom pom kev sib cav sib ceg Hauv cov chaw kuaj tshuaj, nws ua rau kev xa tshuaj thiab cov khoom ruaj khov. Nyob rau hauv kev lag luam khoom noj khoom haus, nws txhim kho kev ntxhib los mos thiab noo noo khaws cia. Hauv kev tsim kho, nws ua kom zoo rau cov ntaub ntawv ua haujlwm thiab kav ntev. Cov khoom siv saib xyuas tus kheej los ntawm nws cov khoom siv thickening thiab ruaj khov, thaum cov xim pleev xim rau kev siv lub ntsej muag rheology. Txawm nyob rau hauv cov roj thiab roj sector, hpmc cov khoom txuag txhim kho kua dej kev ua haujlwm. Ntau yam ntawm HPMC tseem niaj hnub tsav tsheb tshiab thiab ntawv thov nyob rau ntau qhov tseem ceeb raws li cov khoom muaj txiaj ntsig tseem ceeb hauv cov khoom siv niaj hnub.
Lub Sijhawm Post: Feb-18-2025