HydroxyPropyyl methylcellose (HPMC) yog cov polymer compound tau los ntawm cov tshuaj kho kho ntuj hloov cellulose. Nws muaj cov dej ua kom zoo, tsis-toxicity, tsis muaj ntxhiab thiab zoo biocompatibility. Yog li ntawd, nws yog dav siv nyob rau hauv cov xim, kev tsim kho, chaw muag tshuaj, khoom noj thiab lwm thaj teb. Hauv kev lag luam pleev xim, HPMC ua si lub luag haujlwm tseem ceeb yog cov tuab dua, uas tuaj yeem txhim kho kev ua tau zoo, ruaj khov thiab ua cov xim pleev xim.
1. Lub luag haujlwm ntawm HPMC ua cov xim tuab
HPMC ua si cov luag haujlwm hauv qab no raws li cov tuab tuab hauv cov xim tuab:
(1) nce viscosity ntawm cov xim
HPMC tuaj yeem nqus dej thiab o hauv cov xim pleev xim feem ntau los ntawm nws cov qauv saw hlau, thiab yog li nce viscosity ntawm cov xim. Qhov nce hauv viscosity txhim kho lub rheological cov khoom ntawm cov xim thiab txhim kho cov txheej txheej ntawm cov xim. Tshwj xeeb, HPMC tuaj yeem ua txhuam hniav thiab txau ua tau zoo ntawm cov xim pleev xim thiab zam dhau sagging lossis dripping ntau dhau los.
(2) Txhim kho cov khoom siv hluav taws xob rheological ntawm txheej txheej
Daim ntawv thov ntawm HPMC hauv cov txheej txheem tuaj yeem txhim kho lawv cov khoom siv hluav taws xob ntau, tshwj xeeb tshaj yog cov nqi viscosity zoo thiab muaj peev xwm ruaj khov thiab ruaj khov. Qhov no yog ib qho tseem ceeb heev rau kev ua cov txheej txheem hauv cov txheej txheem sib txawv, tshwj xeeb tshaj yog rau cov nyhuv siv thaum cov khoom loj. Los ntawm kev kho cov kev xav thiab cov roj ntsha hnyav ntawm HPMC, lub fluidity ntawm txheej tuaj yeem tswj tau nrawm, yog li nws tsis yooj yim heev thaum siv tau cov yam ntxwv.
(3) Txhim kho kab rov tav sib tav
Cov nyhuv tuab ntawm HPMC hauv cov txheej txheem HPMC tsis yog tsuas yog ntxiv viscosposity, tab sis kuj yog txhawm rau txhim kho cov txheej txheem ntawm cov txheej txheem. Kab rov tav no yog hais txog qhov muaj peev xwm ntawm cov txheej ntawm cov txheej txheem ntawm lub substrate tom qab txhuam hniav tsis muaj kev txhuam hniav lossis tsis sib xws. HPMC nce cov kev nro saum npoo thiab ua kom cov txheej txheem ntws ntawm cov txheej txheej, yog li ntawd cov txheej txheej ua ib qho kev sib dhos thiab cov txheej txheem txheej dawb ntawm cov ntug ntawm substrate.
(4) txuas ntxiv lub sij hawm qhib ntawm txheej
Raws li cov tuab dua, hpmc kuj muaj cov haujlwm ntawm lub caij nyoog qhib lub sijhawm qhib ntawm txheej. Lub sijhawm qhib yog hais txog lub sijhawm uas cov txheej tseem ua haujlwm thaum lub sijhawm ua ntawv thov. Lub sijhawm no pab kom tiv thaiv cov txheej los ntawm kev ziab nrawm dhau thaum ua cov txheej txheem txhuam hniav, uas ua rau cov cim tsis sib xws lossis txhuam cov cim. HPMC txhim kho cov evaporation tus nqi ntawm cov txheej txheej, tso cai rau cov txheej txheem dej los tswj cov viscosity uas tsim nyog rau lub sijhawm ntev dua, kom ua rau txheej txheem sib txawv.
(5) Txhim kho qhov ruaj khov ntawm txheej
Cov nyhuv tuab ntawm HPMC kuj tseem pab txhim kho cov kev tshem tawm cov txheej txheem xws li pigments thiab fillers, tiv thaiv kom pom kev, thiab txuas ntxiv lub sijhawm khaws cia ntawm txheej. Los ntawm kev kho cov molecular hnyav thiab qib ntawm hloov chaw ntawm HPMC, qhov ruaj khov ntawm txheej tuaj yeem ua kom zoo dua yog li nws yuav tsis stratify lossis nag los thaum lub sijhawm cia.
2. Daim ntawv thov ntawm HPMC hauv cov dej pleev dej
Cov dej pleev dej ua haujlwm tau tshaj tawm nyob rau xyoo tas los no vim lawv kev tiv thaiv ib puag ncig, tsis muaj kuab paug, thiab tsis muaj kuab paug. Daim ntawv thov ntawm HPMC hauv cov txheej txheej hauv dej yog tshwj xeeb yog ib qho tseem ceeb. Nws tsis tsuas yog ua raws li cov tuab dua, tab sis kuj ua lub luag haujlwm tseem ceeb hauv cov hauv qab no:
(1) txhim kho kev nyab xeeb thiab ua haujlwm
Lub fluidity ntawm cov dej-ua cov txheej txheej feem ntau cuam tshuam los ntawm cov dej ntsiab lus thiab cov ntsiab lus nyuaj. HPMC tuaj yeem hloov kho cov rheology ntawm cov dej sib xyaw kom muaj cov kab mob siab dua ntawm cov nqi siab dua, yog li ua kom muaj zog thaum muaj cov haujlwm zoo thaum sib. Tsis tas li ntawd, HPMC tseem tuaj yeem ua kom zoo dua lub thixotropy ntawm txheej, uas yog, cov txheej muaj qee yam viscosity nyob rau hauv lub xeev zoo li qub, tab sis tuaj yeem txo cov hom phiaj zoo li qub thaum daim ntawv thov cov txheej txheem los pab txhawb kev khiav.
(2) Txhim kho cov dej tsis kam ntawm cov dej ua haujlwm
HPMC lwg me me muaj cov pab pawg hydrophilic, uas tuaj yeem txhim kho kev sib txuam ntawm cov dej pleev dej rau dej. Thaum lub sijhawm ua kom qhuav ntawm txheej, HPMC tuaj yeem txo cov teeb meem ntawm cov dej evaporively ntawm dej, yog li kev txhim kho cov dej tsis kam thiab cov nplaum ntawm txheej.
(3) txhim kho cov pob tshab thiab cov khoom ci ntawm txheej
Vim nws cov solubility siab, HPMC tuaj yeem pab cov txheej txheej hauv dej uas muaj lub ntsej muag siab muaj siab dua pob tshab thiab ci. Hauv qee cov kev siv txheej tshwj xeeb, xws li cov tshuaj vanish, kev siv HPMC tuaj yeem tswj hwm qhov kev pom tseeb ntawm txheej thiab txhim kho txheej kawg.
3. Daim ntawv thov ntawm HPMC hauv cov roj txheej txheej
Nyob rau hauv cov roj txheej, HPMC yog siv los ua cov tuab thiab rheology regulator. Txawm hais tias HPMC nws tus kheej yog cov dej-soluble, nws cov nyhuv zoo rau hauv cov roj txheej txheej yog tseem dav siv. Nyob rau hauv cov xim pleev xim rau cov roj av, HPMC tuaj yeem hloov kho cov xim ntawm cov xim, thiab tshuaj tsuag ntawm cov xim pleev xim, thiab kuj tiv thaiv cov xim av, thiab txo cov stratification ntawm cov xim.
4. Qhov zoo ntawm HPMC ua cov tuab tuab
Piv nrog tsoos thickeners tsoos, daim ntawv thov ntawm HPMC hauv cov xim tha xim muaj cov txiaj ntsig zoo hauv qab no:
Kev Tiv Thaiv Kev Tiv Thaiv Zoo: HPMC yog ib qho kev sib tw ntawm cov khoom siv ntuj ntuj thiab tsis muaj kev nyab xeeb rau siv cov xim pleev xim rau ib puag ncig.
Muaj zog dej solubility: HPMC muaj cov xim ua si zoo thiab ruaj khov nyob rau hauv cov dej pleev xim, thiab yuav tsis cuam tshuam lwm cov khoom ntawm cov xim.
Kev tsim kho kom zoo: HPMC ua tau zoo txhim kho kev tsim kho cov xim, kom tsis txhob qhuav thiab tsis sib xws, thiab yog qhov tsim nyog rau cov txheej txheem sib txawv.
Txhim kho cov chaw cia khoom ruaj khov: HPMC tuaj yeem tswj lub cev nqaij daim tawv thiab tshuaj lom neeg ntawm cov xim thiab txo cov kev sibtaws los nag uas yuav tshwm sim thaum lub sijhawm cia.
Raws li cov xim tuab, HPMC tsis tuaj yeem tsuas ua rau viscosity ntawm cov xim thiab txhim kho lub rheology, tab sis kuj txhim kho kev ruaj khov, leveling thiab kev tsim kho cov xim tha xim. Nws yog dav siv hauv cov xim pleev xim rau cov dej thiab cov xim pleev xim rau roj. Los ntawm kev kho nws cov qauv molecular thiab concentration, kev ua tau zoo ntawm txheej tuaj yeem hloov kho tau kom tau raws li cov khoom siv ntau yam. Nrog rau qhov kev thov nce zuj zus rau ib puag ncig phooj ywg thiab cov kev ua qias tuaj ntawm HPMC yuav dav dav thiab nws yuav dhau los ua ib qho tseem ceeb ua haujlwm ntxiv hauv kev lag luam txheej loj.
Lub sijhawm Post: Feb-15-2025