Hydroxyethyl cellulose (HEC) yog ib qho tseem ceeb notic dej-soluble polymer yog rau lub cellulose ether ntawm cov tebchaw. Nws tau txais los ntawm etherification cov tshuaj tiv thaiv ntawm ntuj cellulose nrog ethylene oxide (Ethylene Oxide) nyob rau hauv Alkaline tej yam kev mob. Hydroxyethyl cellulose yog txoj hlua khi polysacchar tau tsim los ntawm cov roj av hauv cov qauv tshuaj lom neeg los tsim hydroxyethyl cellulose.
Cov khoom xyaw thiab tshuaj lom neeg
Cov qauv molecular ntawm hydroxyethyl cellulose tsuas yog suav nrog cov ntu hauv qab no:
Cellulose nraub qaum: cellulose yog lub ntuj polysaccharide, lub ntsiab tiv thaiv ntawm cov uas yog ib txoj kab sib txuas ntawm cov dej qab zib nrog β-1,4-glycosidic bonds. Cov qauv no ntawm cellulose muab nws siab crystallinity thiab lub zog lub cev.
Hydroxyethyl hloov chaw: nyob rau hauv chav dej qab zib ntawm lub cellulose nraub qaum, muaj cov pab pawg hydroxyl (-oh), nyob ntawm C2, C3 thiab C6 txoj haujlwm thoob tsib. Hydroxyethyl cellulose yog tsim los ntawm kev qhia hydroxyethyl (-ch2ch2oh) pawg ntawm cov pab pawg hydroxyl ntawm cov pab pawg hydroxyl thiab ethylene oxide. Cov lus qhia ntawm cov kev hloov pauv no txo cov crystallinity ntawm cellulose, txhim kho nws cov dej solubility, thiab ua rau nws pom cov dej ua kom zoo thiab cov xim paug hauv cov aqueous.
Molecular hnyav thiab qib degree hloov chaw: txoj kev siv roj ntsha uas hloov chaw nyob rau txhua lub tsev noj qab haus huv (ie, Feem ntau, hydroxyethyl cellulose nrog lub zog loj dua muaj peev xwm zoo dua thiab muaj peev xwm ua kom muaj peev xwm zoo dua li hloov kho nws cov dej solubility thiab ruaj khov.
Lub cev muaj zog ntawm hydroxyethyl cellulose
Vim nws cov qauv tshwj xeeb, hydroxyethyl cellulose cov khoom pov thawj kev ua yeeb yam ntawm cov khoom siv dag zog zoo heev:
Dej solubility: hydroxyethyl cellulose yog yooj yim soluble nyob rau hauv txias thiab kub turbid colloidal tov. Nws cov txheej txheem sib cais tsis cuam tshuam dab tsi los ntawm PHIC tus nqi thiab tseem ruaj khov tshaj li ntawm qhov ntau ntau (feem ntau ntawm 2 thiab 12).
Thickening: hydroxyethyl cellulose muaj cov kev daws teeb meem zoo, thiab lub peev xwm thickened tau cuam tshuam los ntawm molecular hnyav, degree hloov chaw thiab kev daws teeb meem. Raws li kev xav tau nce, lub viscosity ntawm kev daws teeb nce ntxiv, yog li nws tau siv dav hauv kev lag luam teb uas yuav tsum muaj tuab.
Cov haujlwm saum npoo av: Vim tias cov pab pawg hydroxyethyl muaj cov pab pawg hydrophilic, nws tuaj yeem txo cov dej nro hauv cov dej thiab qhia ib qho kev ua si saum npoo av. Cov cuab yeej no ua rau nws siv rau hauv cov ntxaij thiab lwm thaj teb, thiab tuaj yeem txhim kho cov kua txiv thiab cov khoom siv txheej ntawm cov khoom.
STABILITY: Hydroxyethyl cellulose muaj qhov ruaj khov nyob rau hauv cov tshuaj aqueous, tuaj yeem tiv thaiv tus kheej oxidants thiab qhov ruaj khov nyob rau hauv cov kua qaub thiab alkaline. Nws yuav tsis yog degraded los ntawm cov kab mob feem ntau hauv cov kev daws aqueous, yog li nws tsis yooj yim rau kev puas tsuaj thaum lub sijhawm cia.
Biocompatibility thiab kev nyab xeeb: hydroxyethyl cellulose yog siv tau dav hauv cov zaub mov, cov tshuaj pleev ib ce thiab tseem tswj hwm zoo biocompatibility thiab tseem tswj hwm zoo biocompatibility thiab cov tshuaj lom neeg tsawg tom qab hloov kho tshuaj lom neeg. Piv txwv li, nws yog siv los ua cov tuab thiab muaj stabilizer nyob rau hauv cov zaub mov, thiab emulsifier stabililizer nyob rau hauv cov tshuaj pleev ib ce, thiab ua phau ntawv tso tawm thiab tso tawm cov ntsiav tshuaj hauv kev npaj tshuaj.
Npaj thiab daim ntawv thov
Kev npaj ntawm hydroxyethyl cellulose feem ntau muab faib ua peb kauj ruam: alkalization ntawm cellulose, cov tshuaj tiv thaiv kab ntsig, kev ua kom huv thiab ziab. Ua ntej, cellulose tau kho nyob rau hauv Alkaline tej yam kev mob kom qhib cov pawg hydroxyl ntawm ethylene oxide los tsim hydroxyethyl cellulose. Thaum kawg, cov khoom kawg tau txais los ntawm cov kauj ruam xws li kev neutralization, purification thiab ziab.
Hydroxyethyl cellulose yog dav siv nyob rau hauv cov ntaub ntawv hauv tsev (xws li cement tshuaj thiab tshuaj pleev ib ce), tshuaj noj txhua hnub (xws li cov tshuaj lom neeg thiab cov khoom noj ua ke).
Hydroxyethyl cellulose yog dav siv nyob rau hauv ntau daim teb vim nws lub cev thiab tshuaj lom neeg thiab versatility thiab versatility thiab versatility thiab versatility thiab versatility thiab versatility thiab versatility thiab versatility. Qhov tsis zoo ntawm nws cov qauv thiab kev sib xyaw ua rau nws ua lub luag haujlwm tseem ceeb hauv thickening, kev raug tshem tawm thiab stabilization, thiab yog ib yam khoom siv tsis tseem ceeb.
Lub Sijhawm Post: Feb-17-2025