Hydroxypropyl methylcellulose (HPMC) yog ib qho polymer uas siv tau ntau yam hauv ntau yam lag luam, suav nrog tshuaj, tshuaj pleev ib ce, khoom noj, thiab kev tsim kho. Nws lub peev xwm los tsim cov gels, zaj duab xis, thiab cov kev daws teeb meem ua rau nws muaj txiaj ntsig zoo rau ntau daim ntawv thov. Kev ua kom noo ntawm HPMC yog ib kauj ruam tseem ceeb hauv ntau cov txheej txheem, vim nws ua rau cov polymer ua kom pom nws cov khoom xav tau zoo.
1. Nkag Siab Txog HPMC:
HPMC yog ib qho derivative ntawm cellulose thiab yog synthesized los ntawm kev kho cellulose nrog propylene oxide thiab methyl chloride. Nws yog tus cwj pwm los ntawm nws cov dej-soluble thiab lub peev xwm los tsim cov pob tshab, thermally reversible gels. Qib ntawm hydroxypropyl thiab methoxyl hloov pauv cuam tshuam rau nws cov khoom, suav nrog solubility, viscosity, thiab gelation tus cwj pwm.
2. Qhov Tseem Ceeb ntawm Kev Haus Dej:
Kev haus dej yog qhov tseem ceeb rau kev qhib cov haujlwm ntawm HPMC. Thaum HPMC raug haus dej, nws nqus dej thiab o, ua rau muaj cov kua nplaum lossis gel, nyob ntawm qhov concentration thiab cov xwm txheej. Lub xeev hydrated no ua rau HPMC ua tiav nws cov haujlwm xav tau, xws li thickening, gelling, zaj duab xis-tsim, thiab txhawb nqa kev tso tawm tshuaj.
3. Cov Txheej Txheem Ua Kom Dej:
Muaj ntau txoj hauv kev rau kev ua kom HPMC noo, nyob ntawm daim ntawv thov thiab qhov tshwm sim xav tau:
a. Dej Txias Faib Tawm:
Txoj kev no suav nrog kev faib cov hmoov HPMC hauv dej txias thaum do maj mam.
Kev faib dej txias yog qhov zoo dua los tiv thaiv kev sib sau ua ke thiab xyuas kom meej tias muaj dej sib npaug.
Tom qab dispersion, cov tshuaj feem ntau raug tso cai rau hydrate ntxiv nyob rau hauv gentle agitation kom ua tiav qhov viscosity xav tau.
b. Kev Sib Kis Dej Kub:
Hauv txoj kev no, HPMC hmoov raug faib rau hauv dej kub, feem ntau ntawm qhov kub siab tshaj 80 ° C.
Dej kub ua rau kom cov dej noo sai thiab yaj ntawm HPMC, ua rau muaj kev daws teeb meem meej.
Yuav tsum tau ceev faj kom tsis txhob muaj cua sov ntau dhau, uas tuaj yeem ua rau HPMC puas tsuaj lossis ua rau muaj pob.
c. Kev Ua Kom Tsis Muaj Kev Cuam Tshuam:
Qee daim ntawv thov yuav cuam tshuam nrog kev ua kom cov tshuaj HPMC tsis muaj zog nrog cov neeg sawv cev alkaline xws li sodium hydroxide lossis potassium hydroxide.
Kev ua kom tsis muaj zog kho qhov pH ntawm cov tshuaj, uas tuaj yeem cuam tshuam rau qhov viscosity thiab gelation ntawm HPMC.
d. Kev Sib Pauv Cov Tshuaj Tua Kab:
HPMC kuj tseem tuaj yeem ua kom dej los ntawm kev pauv cov kuab tshuaj, qhov twg nws tau tawg ua cov kuab tshuaj uas sib xyaw tau hauv dej xws li ethanol lossis methanol thiab tom qab ntawd pauv nrog dej.
Kev pauv cov kuab tshuaj tuaj yeem pab tau rau cov ntawv thov uas xav tau kev tswj hwm qhov dej thiab viscosity.
e. Ua ntej haus dej:
Kev ua kom dej noo ua ntej suav nrog kev muab HPMC tso rau hauv dej lossis cov kuab tshuaj ua ntej muab tso rau hauv cov qauv.
Txoj kev no ua kom muaj dej txaus thiab tuaj yeem pab tau kom ua tiav cov txiaj ntsig zoo sib xws, tshwj xeeb tshaj yog nyob rau hauv cov mis sib xyaw.
4. Tej Yam Uas Cuam Tshuam Rau Kev Haus Dej:
Muaj ntau yam uas cuam tshuam rau qhov hydration ntawm HPMC:
a. Qhov Loj ntawm Cov Khoom Me Me: Cov hmoov HPMC uas raug sib tsoo zoo ua rau cov dej noo yooj yim dua li cov khoom me me vim tias thaj chaw ntawm cov khoom loj dua.
b. Kub: Qhov kub siab dua feem ntau ua rau kom cov dej noo sai dua tab sis kuj tseem tuaj yeem cuam tshuam rau qhov viscosity thiab gelation ntawm HPMC.
c. pH: Lub pH ntawm cov dej nruab nrab tuaj yeem cuam tshuam rau lub xeev ionization ntawm HPMC thiab yog li nws cov kinetics hydration thiab rheological zog.
d. Kev Sib Tov: Kev sib tov lossis kev sib xyaw kom zoo yog qhov tseem ceeb rau kev sib xyaw ua ke thiab kev sib kis ntawm HPMC cov khoom hauv cov kuab tshuaj.
e. Kev Ntsuas: Qhov kev ntsuas ntawm HPMC hauv cov dej nruab nrab cuam tshuam rau qhov viscosity, gel lub zog, thiab lwm yam khoom ntawm cov tshuaj lossis gel.
5. Cov ntawv thov:
Hydrated HPMC pom ntau yam kev siv thoob plaws ntau yam lag luam:
a. Cov Qauv Tshuaj: Hauv cov tshuaj pleev xim, cov matrices tswj kev tso tawm, cov tshuaj ophthalmic, thiab cov tshuaj ncua.
b. Cov Khoom Noj: Ua ib qho thickener, stabilizer, lossis zaj duab xis-forming tus neeg sawv cev hauv cov kua ntses, dressings, mis nyuj, thiab khoom qab zib.
c. Tshuaj pleev ib ce: Hauv cov tshuaj pleev, tshuaj pleev, gels, thiab lwm yam tshuaj rau kev hloov pauv viscosity thiab emulsification.
d. Cov Khoom Siv Tsim Kho: Hauv cov khoom siv ua los ntawm cement, cov nplaum rau pobzeb, thiab cov renders los txhim kho kev ua haujlwm tau zoo, kev khaws dej, thiab kev nplaum.
6. Kev Tswj Xyuas Zoo:
Kev ua kom muaj dej txaus ntawm HPMC yog qhov tseem ceeb rau kev ua haujlwm ntawm cov khoom thiab kev sib xws. Kev ntsuas kev tswj xyuas zoo yuav suav nrog:
a. Kev Tshuaj Xyuas Qhov Loj ntawm Cov Khoom Me Me: Xyuas kom meej tias qhov sib npaug ntawm kev faib tawm qhov loj ntawm cov khoom me me kom ua kom zoo tshaj plaws rau kev ua kom cov dej noo noo.
b. Kev Ntsuas Viscosity: Saib xyuas viscosity thaum lub sijhawm hydration kom ua tiav qhov sib xws xav tau rau daim ntawv thov uas tau npaj tseg.
c. Kev Saib Xyuas pH: Tswj cov pH ntawm cov dej nruab nrab kom ua kom cov dej noo zoo tshaj plaws thiab tiv thaiv kev puas tsuaj.
d. Kev Tshuaj Xyuas Me Me: Kev tshuaj xyuas cov qauv dej hauv qab lub tshuab kuaj me me kom ntsuas qhov sib kis thiab kev ua tiav ntawm cov khoom me me.
7. Xaus Lus:
Kev ua kom dej noo yog ib qho txheej txheem tseem ceeb hauv kev siv cov khoom ntawm HPMC rau ntau yam kev siv. Kev nkag siab txog cov txheej txheem, cov yam ntxwv, thiab kev tswj xyuas zoo uas cuam tshuam nrog kev ua kom dej noo yog qhov tseem ceeb rau kev ua kom cov khoom ua haujlwm zoo dua thiab xyuas kom meej tias muaj kev sib xws hauv cov qauv. Los ntawm kev paub txog kev ua kom dej noo ntawm HPMC, cov kws tshawb fawb thiab cov neeg tsim qauv tuaj yeem qhib nws lub peev xwm tag nrho thoob plaws ntau yam kev lag luam, tsav tsheb tsim kho tshiab thiab kev tsim khoom.
Lub sijhawm tshaj tawm: Lub Peb Hlis-04-2024