Hydroxyethyl Methyl Cellulose (HEMC) yog derivative ntawm natural polymer khoom cellulose. Nws yog cov dej-soluble polymer tsim tom qab kev hloov kho tshuaj thiab muaj ntau yam kev siv. Raws li ib qho tseem ceeb ntawm cov dej-soluble cellulose ether, nws muaj ntau yam tshwj xeeb lub cev thiab tshuaj lom neeg thiab siv dav hauv kev tsim kho, txheej, tshuaj pleev ib ce, zaub mov thiab tshuaj.
1. Cov qauv tshuaj thiab muaj pes tsawg leeg
Hydroxyethyl methyl cellulose yog hloov kho cellulose tsim los ntawm etherification cov tshuaj tiv thaiv cellulose nrog ethylene oxide (epoxy) thiab methyl chloride tom qab kho alkali. Nws cov qauv tshuaj muaj ib lub cev pob txha cellulose thiab ob qho kev hloov pauv, hydroxyethyl thiab methoxy. Kev taw qhia ntawm hydroxyethyl tuaj yeem txhim kho nws cov dej solubility, thaum kev qhia txog methoxy tuaj yeem txhim kho nws cov hydrophobicity, ua rau nws muaj kev ruaj ntseg zoo dua thiab kev tsim cov yeeb yaj kiab.
2. Solubility
Hydroxyethyl methyl cellulose yog non-ionic cellulose ether nrog dej solubility zoo, uas tuaj yeem yaj hauv dej txias thiab dej kub. Nws tsis hnov mob nrog ions hauv dej thaum nws yaj, yog li nws muaj solubility zoo nyob rau hauv ntau yam dej. Cov txheej txheem tawg yuav tsum tau muab sib npaug sib npaug hauv cov dej txias ua ntej, thiab tom qab lub sijhawm o, ib qho kev daws teeb meem thiab pob tshab yog maj mam tsim. Nyob rau hauv cov kuab tshuaj organic, HEMC qhia ib nrab solubility, tshwj xeeb tshaj yog nyob rau hauv cov polar solvents xws li ethanol thiab ethylene glycol, uas muaj peev xwm yaj ib nrab.
3. Viscosity
Lub viscosity ntawm HEMC yog ib qho ntawm nws cov khoom tseem ceeb tshaj plaws thiab yog dav siv nyob rau hauv thickening, suspension thiab film forming. Nws viscosity hloov nrog cov kev hloov hauv concentration, kub thiab shear tus nqi. Feem ntau, cov viscosity ntawm cov tshuaj nce ntau nrog kev nce hauv cov kua concentration. Ib qho kev daws teeb meem nrog cov concentration siab dua qhia tau tias muaj viscosity siab thiab tsim nyog siv los ua cov thickener rau cov khoom siv hauv tsev, coatings thiab adhesives. Hauv qee qhov kub thiab txias, qhov viscosity ntawm HEMC cov tshuaj txo qis nrog qhov kub thiab txias, thiab cov cuab yeej no ua rau nws tsim nyog rau kev lag luam siv nyob rau hauv qhov sib txawv kub.
4. Thermal stability
Hydroxyethyl methylcellulose qhia tau zoo thermal stability ntawm qhov kub thiab txias thiab muaj qee yam kub tsis kam. Feem ntau, nyob rau hauv qhov kub thiab txias (xws li siab dua 100 ° C), nws cov qauv molecular yog qhov ruaj khov thiab tsis yooj yim rau decompose lossis degrade. Qhov no tso cai rau HEMC tswj nws cov thickening, dej tuav thiab kev sib txuas cov khoom nyob rau hauv qhov kub thiab txias ib puag ncig hauv kev tsim kho kev lag luam (xws li cov txheej txheem mortar kom qhuav) yam tsis muaj txiaj ntsig zoo vim qhov kub hloov pauv.
5. Thickening
HEMC muaj cov khoom thickening zoo heev thiab yog cov thickener muaj txiaj ntsig zoo uas tau siv dav hauv ntau lub tshuab tsim. Nws tuaj yeem ua kom cov viscosity ntawm cov tshuaj aqueous, emulsions thiab suspensions, thiab muaj cov khoom zoo shear thinning. Ntawm qhov qis shear tus nqi, HEMC tuaj yeem ua kom cov viscosity ntawm lub kaw lus, thaum lub siab shear tus nqi nws nthuav tawm qis viscosity, uas yuav pab txhim kho qhov yooj yim ntawm kev ua haujlwm thaum lub sij hawm thov. Nws cov nyhuv thickening tsis yog tsuas yog muaj feem xyuam rau cov concentration, tab sis kuj cuam tshuam los ntawm pH tus nqi thiab kub ntawm cov tshuaj.
6. Kev tuav dej
HEMC feem ntau yog siv los ua tus neeg saib xyuas dej hauv kev tsim kho. Nws cov dej tuav tau zoo tuaj yeem ua kom ntev lub sijhawm hydration cov tshuaj tiv thaiv ntawm cov khoom siv cement thiab txhim kho kev ua haujlwm thiab adhesion ntawm lub tsev mortar. Thaum lub sij hawm tsim kho, HEMC tuaj yeem txo cov dej tsis zoo thiab tsis txhob muaj teeb meem xws li kev tawg thiab lub zog poob los ntawm kev ziab ntawm mortar sai heev. Tsis tas li ntawd, nyob rau hauv cov xim pleev xim rau cov dej thiab cov inks, HEMC cov dej tuav kuj tuaj yeem tswj cov dej ntws ntawm cov xim, txhim kho cov xim ntawm kev tsim kho thiab kev ua kom zoo.
7. Biocompatibility thiab kev nyab xeeb
Vim tias HEMC yog muab los ntawm cov cellulose ntuj, nws muaj biocompatibility zoo thiab tsis muaj tshuaj lom. Yog li ntawd, nws kuj tau siv dav hauv kev kho mob thiab tshuaj pleev ib ce. Nws tuaj yeem siv los ua tus neeg tsis sib haum xeeb lossis cov neeg sawv cev tso tawm hauv cov ntsiav tshuaj los pab kom muaj kev ruaj ntseg tso tawm cov tshuaj hauv lub cev. Tsis tas li ntawd, raws li ib tug thickener thiab film-forming tus neeg sawv cev nyob rau hauv cov tshuaj pleev ib ce, HEMC tuaj yeem muab cov nyhuv moisturizing rau ntawm daim tawv nqaij, thiab nws txoj kev nyab xeeb zoo ua rau nws haum rau kev siv mus ntev.
8. Daim ntawv thov teb
Vim muaj cov khoom siv ntau yam ntawm hydroxyethyl methylcellulose, nws tau siv dav hauv ntau qhov chaw lag luam:
Kev tsim kho kev lag luam: Hauv cov khoom siv hauv tsev xws li cement mortar, putty hmoov, thiab cov khoom siv gypsum, HEMC tuaj yeem siv los ua cov thickener, dej-retaining agent, thiab nplaum los txhim kho kev tsim kho thiab cov khoom tiav.
Coatings thiab inks: HEMC yog siv dav hauv cov xim dej thiab cov inks ua cov thickener thiab stabilizer los txhim kho qib, ruaj khov, thiab gloss ntawm cov xim tom qab ziab.
Kev kho mob: Raws li ib qho kev tsis sib xws, cov nplaum thiab cov neeg tso tawm-tso tawm hauv cov neeg nqa tshuaj, nws tuaj yeem tswj hwm tus nqi tso tawm ntawm cov tshuaj hauv lub cev thiab txhim kho bioavailability ntawm cov tshuaj.
Cov khoom siv tshuaj pleev ib ce thiab kev tu tus kheej: Hauv cov khoom tu tus kheej xws li tshuaj pleev, tshuaj pleev, thiab tshuaj zawv plaub hau, HEMC tuaj yeem siv los ua cov thickener thiab moisturizer, thiab muaj cov tawv nqaij zoo thiab cov plaub hau affinity.
Kev lag luam khoom noj khoom haus: Hauv qee cov khoom noj, HEMC tuaj yeem siv los ua tus stabilizer, emulsifier thiab cov neeg ua yeeb yaj kiab. Txawm hais tias nws siv nyob rau hauv cov zaub mov yuav raug txwv nyob rau hauv qee lub teb chaws, nws txoj kev nyab xeeb tau pom dav dav.
9. Environmental stability thiab degradability
Raws li cov khoom siv bio-based, HEMC tuaj yeem maj mam degraded nyob rau hauv ib puag ncig, thiab nws cov txheej txheem degradation feem ntau yog ua los ntawm kev ua ntawm cov kab mob. Yog li ntawd, HEMC muaj kuab paug tsawg rau ib puag ncig tom qab siv thiab yog ib qho tshuaj lom neeg zoo dua qub. Nyob rau hauv tej yam ntuj tso tej yam kev mob, HEMC nws thiaj li decompose rau hauv dej, carbon dioxide thiab lwm yam molecules me me, thiab yuav tsis ua rau kom muaj kuab paug nyob rau hauv lub sij hawm ntev ntawm cov av thiab dej.
Hydroxyethyl methylcellulose yog ib qho tseem ceeb ntawm cov dej-soluble cellulose derivative. Vim nws cov khoom tshwj xeeb ntawm lub cev thiab tshuaj lom neeg xws li thickening zoo heev, dej tuav, thermal stability thiab biocompatibility, nws yog dav siv nyob rau hauv ntau industries xws li kev tsim kho, coatings, tshuaj, tshuaj pleev ib ce, thiab lwm yam. tseem ceeb functional additive nyob rau hauv ntau yam formulation systems. Tshwj xeeb tshaj yog nyob rau hauv qhov chaw uas yuav tsum tau ua kom cov khoom viscosity, ncua kev pab cuam lub neej los yog txhim kho kev khiav hauj lwm kev ua tau zoo, HEMC plays lub luag hauj lwm irreplaceable. Nyob rau tib lub sijhawm, raws li cov khoom siv hauv ib puag ncig, HEMC tau pom tias muaj kev ruaj ntseg zoo hauv kev lag luam thiab muaj kev cia siab rau kev lag luam zoo.
Post lub sij hawm: Sep-27-2024