Hydroxyethyl cellulose: ib tug txheej txheem cej luam
Hydroxyethyl cellulose (HEC) yog tsis-ionic, dej-soluble polymer muab tau los ntawm cellulose, cov muaj kev nplua mias polymer hauv ntiaj teb. Vim nws cov khoom muaj ntau yam, HEC tau dav siv thoob plaws ntau yam lag luam, suav nrog cov tshuaj, suav nrog cov tshuaj, tshuaj pleev ib ce, pleev xim rau.
Synthesis ntawm hydroxyethyl cellulose
Zeem zus ntau lawm cuam tshuam nrog lub etherification ntawm cellulose. Txoj kev no pib nrog cellulose raug kho nrog sodium hydroxide los tsim alkali cellulose. Ethylene oxide yog tom qab ntawd ntxiv rau qhov sib tov no, ua rau muaj kev tsim ntawm hydroxyethyl cellulose. Cov tshuaj tiv thaiv tuaj yeem raug sawv cev raws li hauv qab no:
Cellulose-ona + nch2cho → cellulose-och2cheh
Cov qib degree ntawm kev hloov pauv (DS) thiab cov hniav nyiaj hniav mob (MS) yog qhov tseem ceeb hauv kev txiav txim siab cov khoom ntawm HEC. DS hais txog qhov nruab nrab tus naj npawb ntawm cov pab pawg hydroxyl ntawm cov xov tooj ntawm cov neeg ethylene oxide hauv chav tsev zoo nkauj ntawm cellulose. Cov teeb meem no cuam tshuam rau solubility, viscosity, thiab lwm yam kev ua haujlwm ntawm HEC.
HEC muaj ob peb qhov chaw sib txawv:
Solubility: HEC yog soluble hauv ob qho dej kub thiab dej txias, uas ua rau nws muaj ntau yam rau ntau yam kev siv. Nws tuaj yeem tsim cov kev daws teeb meem, tuab cov kev daws teeb meem uas tau ruaj khov tshaj li ntau ntau.
Viscosity: viscosity ntawm HEC kev daws teeb meem yog nyob ntawm nws cov molecular hnyav thiab siab. HEC tuaj yeem tsim cov viscosities ntau, ua rau nws muaj txiaj ntsig hauv cov ntawv thov uas xav tau cov yam ntxwv tshwj xeeb.
Zaj duab xis-tsim muaj peev xwm: HEC tuaj yeem sau daim qauv hloov tau yooj yim, cov yeeb yaj kiab pob tshab. Cov cuab yeej no yog pab tau tshwj xeeb rau hauv cov txheej txheem thiab cov tshuaj pleev ib ce.
Tus neeg saib xyuas tuab: HEC yog ib tus neeg sawv cev tuab tuab, muab qhov xav tau kev sib xws thiab ruaj khov hauv cov qauv.
Stability: HEC yog siv tshuaj tsis ruaj khov thiab tiv taus kev ua kom muaj kev cuam tshuam los ntawm lub teeb, kub, thiab cov kab mob kub, thiab cov kab mob sib xws, thiab cov kab mob sib xws, ua kom tiav nws txoj kev siv ntau yam.
Cov ntawv thov ntawm cov celluleethethyl cellulose
Vim nws cov khoom tshwj xeeb, HEC pom cov ntawv thov nyob rau ntau cov teb:
Kws Tshuaj Kho Mob: Hauv kev lag luam kev lag luam, hauv cov phau ntawv, zaj duab xis-yav dhau los, thiab cov tshuaj pleev ntaub tuab tuab hauv cov ntsiav tshuaj thiab tshuaj pleev. Nws pab hauv kev tswj cov tshuaj tso tawm thiab txhim kho cov qauv thiab kev sib luag ntawm cov qauv.
Cov tshuaj pleev ib ce: HEC feem ntau siv nyob rau hauv cov khoom lag luam saib xyuas ntawm tus kheej xws li tshuaj zawv plaub hau, tshuaj pleev, thiab cream. Nws muab cov vos tsho zoo, txhim kho cov kev xav ntawm cov khoom lag luam, thiab ruaj khov emulsions.
Xim thiab pleev xim: Hauv kev lag luam pleev xim, hec ua raws li cov tuab tuab, stabilizer, thiab dej tuav tus neeg saib xyuas. Nws txhim kho cov khoom siv ntawm cov duab kos duab, tiv thaiv sagging, thiab ua kom pom tseeb txawm tias muaj zaj duab xis.
Kev Tsim Kho: HEC yog siv rau hauv cov ntaub ntawv tsim kho xws li Cement thiab Plaster. Nws txhim kho kev ua haujlwm, dej tuav, thiab kev ua yeeb yam, txhim kho kev ua yeeb yam thiab siv tau cov khoom siv no.
Kev lag luam khoom noj khoom haus: txawm hais tias tsawg dua, HEC tuaj yeem siv los ua cov ntaub tuab thiab muaj stabilizer thiab cov khoom noj du thiab muaj xwm yeem.
Textile kev lag luam: HEC yog siv los ua tus sawv cev rau cov neeg sawv cev ntawm cov textile, muab lub zog thiab ruaj khov rau yarns thaum tab tom hlab.
Kev Nyab Xeeb thiab ib puag ncig kev cuam tshuam
HEC yog feem ntau suav tias muaj kev nyab xeeb rau siv nyob rau hauv ntau yam kev siv, tshwj xeeb hauv cov ntaub ntawv thov thiab tshuaj pleev ib ce, qhov uas nws tau sim ua kom muaj kev lom zem thiab khaus. Nws tsis yog-toxic, tsis-irritating, thiab hypoallgentic, ua rau nws haum rau siv cov khoom siv rau daim tawv nqaij lossis noj.
Los ntawm ib puag ncig lub laj thawj, HEC yog biodegradable thiab muab tau los ntawm cov peev nyiaj tshiab (cellulose). Nws cov kev tsim khoom thiab kev siv yog txuam nrog kev cuam tshuam tsawg. Txawm li cas los xij, ib yam li txhua yam tshuaj, tsim nyog tuav thiab pov tseg yog qhov tsim nyog txo qis qee qhov kev phom sij ib puag ncig.
Hydroxyethyl cellulose yog ib qho ntau yam thiab muaj txiaj ntsig zoo polymer nrog ntau cov ntawv thov hla kev sib txawv. Nws cov khoom tshwj xeeb, xws li cov dej solubility, viscosity tswj, ua yeeb yam muaj peev xwm, thiab kev ruaj khov, ua rau nws tsis tseem ceeb hauv cov khoom siv. Cov synthesis ntawm HEC ntawm cellulose sawv cev rau kev siv cov khoom siv ntuj muaj txiaj ntsig, pab txhawb rau nws cov kev ruaj khov. Nrog rau cov kev nyab xeeb muaj kev nyab xeeb thiab kev cuam tshuam ib puag ncig, HEC tseem muaj cov khoom uas tseem ceeb heev hauv ntau yam kev lag luam thiab kev lag luam.
Lub Sijhawm Post: Feb-18-2025