Hydroxypropyl Methylcellulose (HPMC)yog ib qho hluavtaws cellulose derivative thiab semi-synthetic polymer compound. Nws yog dav siv nyob rau hauv ntau yam lag luam xws li kev tsim kho, tshuaj, khoom noj khoom haus, tshuaj pleev ib ce thiab coatings. Raws li cov non-ionic cellulose ether, HPMC muaj cov dej zoo solubility, zaj duab xis-forming zog, adhesion thiab emulsification, thiab yog li ntawd muaj ib tug tseem ceeb daim ntawv thov nqi nyob rau hauv ntau lub teb.
1. Cov qauv tshuaj thiab cov khoom ntawm HPMC
Cov qauv molecular ntawm HPMC yog muab los ntawm ntuj cellulose. Tom qab kev hloov kho tshuaj, methyl (-OCH₃) thiab hydroxypropyl (-OCH₂CH₂OH) pawg tau nkag rau hauv cov saw cellulose. Nws cov qauv tshuaj lom neeg yog raws li hauv qab no:
Cellulose molecules yog tsim los ntawm qabzib units txuas nrog β-1,4-glycosidic bonds;
Methyl thiab hydroxypropyl pawg tau nkag mus rau hauv cov saw cellulose los ntawm kev hloov pauv.
Cov qauv tshuaj no muab HPMC cov khoom nram qab no:
Dej solubility: Los ntawm kev tswj cov qib ntawm kev hloov ntawm methyl thiab hydroxypropyl pawg, HPMC tuaj yeem kho nws cov dej solubility. Feem ntau hais lus, HPMC tuaj yeem tsim cov kua dej khov rau hauv dej txias thiab muaj dej solubility zoo.
Kev hloov kho viscosity: Lub viscosity ntawm HPMC tuaj yeem tswj tau qhov tseeb los ntawm kev kho qhov hnyav molecular thiab qib ntawm kev hloov pauv kom tau raws li kev thov sib txawv.
Thaum tshav kub kub tsis kam: Txij li HPMC yog cov khoom siv thermoplastic polymer, nws cov cua sov kuj yog qhov zoo thiab nws tuaj yeem tswj kev ua haujlwm ruaj khov nyob rau hauv qee qhov kub thiab txias.
Biocompatibility: HPMC yog cov khoom tsis muaj tshuaj lom thiab tsis ua rau khaus, yog li nws tau nyiam tshwj xeeb hauv kev kho mob.
2. Txoj kev npaj ntawm HPMC
Txoj kev npaj ntawm HPMC feem ntau ua tiav los ntawm cov tshuaj tiv thaiv esterification ntawm cellulose. Cov kauj ruam tshwj xeeb yog raws li nram no:
Cellulose dissolution: Ua ntej, sib tov ntuj cellulose nrog ib qho hnyav (xws li chloroform, cawv hnyav, thiab lwm yam) kom yaj nws mus rau hauv cov tshuaj cellulose.
Kev hloov kho tshuaj: Methyl thiab hydroxypropyl chemical reagents (xws li chloromethyl compounds thiab allyl alcohol) raug ntxiv rau cov tshuaj kom ua rau muaj kev hloov pauv.
Neutralization thiab ziab: Tus nqi pH raug kho los ntawm kev ntxiv cov kua qaub los yog alkali, thiab kev sib cais, purification thiab ziab yog nqa tawm tom qab cov tshuaj tiv thaiv thaum kawg tau txais hydroxypropyl methylcellulose.
3. Cov ntawv thov tseem ceeb ntawm HPMC
Cov khoom tshwj xeeb ntawm HPMC ua rau nws siv dav hauv ntau qhov chaw. Cov hauv qab no yog qee qhov ntawm cov ntawv thov tseem ceeb:
(1) Kev tsim kho: HPMC tau siv dav hauv kev tsim kho kev lag luam, feem ntau hauv cov khoom siv hauv tsev xws li cement, mortar, thiab coatings. Nws tuaj yeem txhim kho fluidity, adhesion thiab dej tuav ntawm qhov sib tov. Tshwj xeeb tshaj yog nyob rau hauv mortar qhuav, HPMC tuaj yeem txhim kho kev tsim kho kev ua tau zoo, ua kom cov nplaum ntawm cov mortar, thiab tsis txhob tawg ntawm cov cement slurry thaum lub sij hawm hardening txheej txheem.
(2) Pharmaceutical field: Hauv chaw ua tshuaj, HPMC feem ntau siv los npaj cov ntsiav tshuaj, tshuaj ntsiav thiab tshuaj kua. Raws li tus neeg sawv cev ua yeeb yaj kiab, thickener thiab stabilizer, nws tuaj yeem txhim kho cov solubility thiab bioavailability ntawm cov tshuaj. Hauv cov ntsiav tshuaj, HPMC tsis tuaj yeem tswj hwm tus nqi tso tawm ntawm cov tshuaj, tab sis kuj txhim kho kev ruaj ntseg ntawm cov tshuaj.
(3) Khoom noj khoom haus: HPMC tuaj yeem siv rau hauv kev ua zaub mov ua cov thickener, emulsifier thiab stabilizer. Piv txwv li, hauv cov khoom noj uas tsis muaj rog thiab tsis muaj rog, HPMC tuaj yeem muab cov saj zoo dua thiab kev ntxhib los mos thiab ua kom cov khoom ruaj khov. Nws kuj yog siv dav hauv cov khoom noj khov los tiv thaiv kev sib cais dej los yog dej khov siv lead ua.
(4) Tshuaj pleev ib ce: Hauv tshuaj pleev ib ce, HPMC feem ntau yog siv los ua cov thickener, emulsifier thiab moisturizer. Nws tuaj yeem txhim kho qhov kev ntxhib los mos ntawm cov tshuaj pleev ib ce, ua rau lawv yooj yim rau kev thov thiab nqus. Tshwj xeeb tshaj yog nyob rau hauv daim tawv nqaij cream, tshuaj zawv plaub hau, ntsej muag lub ntsej muag thiab lwm yam khoom, kev siv HPMC tuaj yeem txhim kho qhov kev xav thiab kev ruaj ntseg ntawm cov khoom.
(5) Coatings thiab xim: Hauv kev lag luam coatings thiab xim, HPMC, ua cov thickener thiab emulsifier, tuaj yeem kho cov rheology ntawm cov txheej, ua rau cov txheej txheem ntau dua thiab du. Nws tuaj yeem txhim kho cov dej tsis kam thiab tiv thaiv fouling ntawm cov txheej txheem, thiab ua kom cov tawv tawv thiab adhesion ntawm txheej.
4. Kev cia siab ntawm kev ua lag luam thiab kev loj hlob ntawm HPMC
Raws li tib neeg them nyiaj ntau dua rau kev tiv thaiv ib puag ncig thiab kev noj qab haus huv, HPMC, raws li cov khoom siv ntsuab thiab tsis muaj tshuaj lom, muaj kev cia siab dav. Tshwj xeeb tshaj yog nyob rau hauv kev lag luam kws tshuaj, khoom noj khoom haus thiab tshuaj pleev ib ce, daim ntawv thov ntawm HPMC yuav nthuav dav ntxiv. Nyob rau hauv lub neej yav tom ntej, cov txheej txheem ntau lawm ntawm HPMC yog qhov yuav ua kom zoo dua ntxiv, thiab kev nce hauv cov zis thiab txo tus nqi yuav txhawb nqa nws daim ntawv thov hauv kev lag luam ntau dua.
Nrog rau kev txhim kho cov ntaub ntawv ntse thiab tswj kev tso tawm thev naus laus zis, daim ntawv thov ntawm HPMC hauv cov tshuab xa tshuaj ntse yuav dhau los ua qhov kev tshawb fawb hotspot. Piv txwv li, HPMC tuaj yeem siv los npaj cov neeg nqa tshuaj nrog kev tswj hwm kev tso tawm kom ntev lub sijhawm ntawm cov nyhuv tshuaj thiab txhim kho kev ua tau zoo.
Hydroxypropyl methylcellulose yog sivyog cov khoom siv polymer nrog kev ua haujlwm zoo thiab siv dav. Nrog nws cov dej solubility zoo heev, muaj peev xwm kho cov viscosity thiab biocompatibility zoo, HPMC muaj cov ntawv thov tseem ceeb hauv ntau qhov chaw xws li kev tsim kho, tshuaj, khoom noj, tshuaj pleev ib ce, thiab lwm yam. Nrog rau kev nce qib ntawm kev tshawb fawb thiab thev naus laus zis, cov txheej txheem tsim khoom thiab daim ntawv thov kev lag luam ntawm HPMC tuaj yeem txuas ntxiv mus, thiab kev txhim kho yav tom ntej yog qhov dav heev.
Lub sij hawm xa tuaj: Mar-11-2025