HPMC (HydroxyPropyilcellulose) thiab HEC (Hydroxyethyl cellulose siv hauv cov qauv tshuaj, khoom, thov teb, thiab lwm yam.
1. Qhov sib txawv hauv cov qauv tshuaj
HPMC thiab HEC yog ob qho tib si cellulose ua tiav los ntawm cov paj ntaub ntuj (xws li paj rwb lossis ntoo pulp), tab sis lawv txawv ntawm cov chaw hloov chaw:
HPMC (HydroxyPropyyl methylcellulose): HPMC tau txais los ntawm qee pawg neeg hydroxy (-ch₃) thiab hydroxypropyl (Oh) Cellulose derivatives. Cov degree ntawm kev hloov methyl thiab hydroxypropropyl pab pawg txiav txim siab cov khoom ntawm HPMC.
HEC (Hydroxyethyl cellulose): HEC yog lub cellulose ether ua los ntawm kev hloov ib feem ntawm hydroxyethyl pab pawg (-ch₂chchoh), feem ntau hydroxyethethylation.
Cov kev sib txawv no hauv cov qauv tshuaj lom neeg ncaj qha cuam tshuam rau lawv solubility, viscosity, thiab lwm lub cev thiab tshuaj lom neeg.
2. Solubility thiab cov xwm txheej sib txawv
HPMC: HPMC muaj cov dej ua dej zoo heev thiab tuaj yeem yaj nyob rau hauv dej txias kom tsim cov tshuaj pleev pob tshab. Nws kuj tseem tuaj yeem ua kom yaj nyob rau hauv cov kuab tshuaj muaj zog xws li ethanol, acetone, thiab lwm yam, tab sis kev sib txawv raws li cov ntsiab lus hloov chaw. Ib qho tseem ceeb ntawm HPMC yog tias nws yaj nyob rau hauv dej txias, hos thaum cua sov cov kev daws teeb meem tsis muaj cua sov (tig mus rau hauv ib gel thaum ua kom sov thaum txias). Cov cuab yeej no tseem ceeb heev hauv kev ua liaj ua teb xws li kev tsim kho thiab txheej.
HEC: HEC kuj tau ploj zuj zus hauv dej txias, tab sis tsis zoo li hPMC, HEC tsis yog gel hauv dej kub. Yog li, HEC tuaj yeem siv dhau qhov kub thiab txias ntau. HEC muaj cov khoom ntsev muaj zog heev thiab thickening cov khoom thiab haum rau kev siv hauv kev daws teeb meem muaj electrolytes.
3. Viscosity thiab rheological khoom
Lub visccosity ntawm HPMC thiab HEC tau sib txawv nrog lawv cov molecular phaus, thiab ob qho tib si muaj cov teebmeem zoo ntawm cov kev sib txawv:
HPMC: HPMC cov khoom ua pov thawj siab pseudoplastic (piv txwv li, shear-thinning cov khoom) hauv kev daws teeb meem. Cov kev daws teeb meem ntawm HPMC tau txo thaum cov xim muaj txiaj ntsig zoo lossis txhuam hniav, xws li cov xim pleev ib ce, thiab cov tshuaj pleev ib ce, thiab cov paab yuav txo qis ntawm ib qho kub.
HEC: HEC cov kev daws teeb meem muaj ntau zog viscosity thiab cov khoom siv thicking zoo dua ntawm cov khoom lag luam qis, piv txwv li shear kev ntxhov siab yog ib feem ntawm shear tus nqi). Tsis tas li, kev daws teeb meem me me muaj cov viscosity me me hloov hauv ib puag ncig muaj cov ntsev ua thiab elecolytes, thiab muaj ntsev kuj zoo. Lawv tau siv dav hauv cov liaj teb uas yuav tsum tau siv ntsev ua ntsev, xws li cov roj tawm thiab kev pab av nkos.
4. Qhov sib txawv hauv kev thov teb
Txawm hais tias ob qho tib si HEC tuaj yeem siv ua cov thickeners, cov nplaum, cov yeeb yaj kiab, thiab lwm yam hauv cov chaw thov sib txawv:
Cov ntawv thov ntawm HPMC:
Kev lag luam kev tsim kho: HPMC yog siv los ua cov neeg sawv cev ua kom tuab thiab ua kom huv, cov khoom sib xyaw, thiab ceramic pobzeb nplaum. Nws txhim kho cov haujlwm ntawm lub tshuaj khib, tiv taus sagging, thiab ntev ntev lub sijhawm qhib ntawm cug cug.
Kws Tshuaj thiab Khoom Noj Khoom Noj: Hauv cov tshuaj, HPMC feem ntau siv ua cov txheej txheej rau cov ntsiav tshuaj thiab cov ntaub ntawv ua haujlwm rau kev npaj ua kom muaj kev npaj cia. Hauv kev lag luam khoom noj khoom haus, HPMC yog siv los ua khoom noj ntxiv, feem ntau yog emulsifier, thickener, thiab stabilizer.
Kev lag luam txhua hnub: HPMC yog siv los ua emulsion stabilizer, thickener, thiab tiv thaiv zaj duab xis-ua yeeb yaj kiab thiab cov khoom tu tus kheej.
Cov ntawv thov ntawm HEC:
Cov roj nthuav tawm: Txij li HEC muaj kev tsim nyog rau cov ntsev, nws yog qhov tshwj xeeb rau kev siv cov kua dej siab los txhim kho cov ntsiab lus cov ntsev kom zoo los txhim kho cov av muaj kev ntxhov siab ntawm cov av nkos.
Txheej Txheej Kev Lag Luam: HEC yog siv los ua cov tuab thiab khov kho hauv cov dej pleev dej. Nws tuaj yeem txhim kho cov kua dej thiab kev tsim kho ntawm cov txheej thiab tiv thaiv cov txheej los ntawm sagging.
Kev lag luam thiab kev lag luam hauv Textile: HEC tuaj yeem siv rau kev kho kom zoo nkauj hauv kev lag luam textile kom tuab thiab kho cov khoom siv hluav taws xob.
5. Ib puag ncig ruaj khov thiab biocompatibility
HPMC: HPMC feem ntau siv nyob rau hauv cov chaw muag tshuaj thiab chaw noj zaub mov vim nws zoo biocompatibility thiab biodegradability. Nws lub thermal gelling cov zog kuj muab nws tshwj xeeb rau nws tshwj xeeb hauv qee qhov kub-rhiab cov tshuaj ntsuam xyuas cov tshuaj. Tsis tas li ntawd, HPMC yog cov kev tsis muaj kev cuam tshuam, tsis muaj kev cuam tshuam los ntawm electrolytes, thiab muaj kev ruaj khov zoo rau hauv PH.
HEC: HEC tseem muaj zoo biocompatibility thiab biodegradability, tab sis nws ua rau muaj kev ruaj khov ntau dua nyob hauv ib puag ncig cov ntsev ntau. Yog li ntawd, HEC yog qhov kev xaiv zoo dua uas yog cov tshuaj electrolyte kuj, xws li cov roj kev tshawb nrhiav, otheore engineering, thiab lwm yam.
6. Tus nqi thiab mov
Txij li thaum HPMC thiab HEC tau muab tau los ntawm cov ntaub ntawv raw yog ruaj khov, tab sis yog tus nqi ntau lawm ntawm HPMC feem ntau siab dua li ntawm Hec. Qhov no ua rau cov ntawv thov HEC tshiab hauv qee cov ntawv thov raug nqi, xws li cov ntaub ntawv tsim kho, roj av, thiab lwm yam.
HPMC thiab HEC yog ob qho tseem ceeb tshaj plaws cellulose derivatives. Txawm hais tias lawv sib txawv hauv cov qauv tshuaj, nkawd ob leeg muaj haujlwm xws li thickening, stabilization, dej tuav thiab ua yeeb yam. Hais txog kev thov tshwj xeeb, HPMC nyob hauv txoj haujlwm tseem ceeb hauv kev tsim kho, kev ua lag luam npaj thiab khoom noj tshwj xeeb thermal gelling cov khoom; Thaum HEC ua lub luag haujlwm tseem ceeb hauv kev lag luam roj av vim nws txoj kev lag luam ntsev zoo dua thiab dav txias hloov kho. Zoo dua hauv kev tsuas thiab cov dej ua cov txheej txheem. Raws li cov kev thov sib txawv, xaiv cov cellulose tsim nyog tuaj yeem txhim kho cov khoom lag luam thiab nyiaj txiag.
Lub Sijhawm Post: Feb-17-2025