Hydroxyethylcellulose (HEC) yog cov khoom siv polymer hauv ntau yam lag luam, suav nrog tshuaj pleev ib ce, tshuaj, thiab zaub mov. Nws yog ib qho kev hloov kho cellulose derivative uas feem ntau muab tau los ntawm ntuj cellulose, ib tug polysaccharide pom nyob rau hauv lub cell phab ntsa ntawm cov nroj tsuag. Qhov ntau yam sib xyaw ua ke no yog tsim los ntawm cov txheej txheem kev hloov kho tshuaj uas cuam tshuam nrog cov cellulose reacting nrog ethylene oxide los qhia cov pab pawg hydroxyethyl mus rau cov pob txha cellulose. Cov txiaj ntsig hydroxyethylcellulose muaj cov khoom tshwj xeeb rheological, ua rau nws muaj txiaj ntsig hauv ntau yam kev siv.
Cellulose, cov khoom siv tseem ceeb rau hydroxyethylcellulose, muaj ntau nyob rau hauv cov xwm thiab tuaj yeem tau txais los ntawm ntau qhov chaw cog. Feem ntau qhov chaw ntawm cellulose muaj xws li ntoo pulp, paj rwb, hemp, thiab lwm yam nroj tsuag fibrous. Kev rho tawm ntawm cellulose feem ntau cuam tshuam nrog kev rhuav tshem cov khoom cog los ntawm kev siv tshuab lossis tshuaj lom neeg kom cais cov cellulose fibers. Thaum cais tawm, cellulose tau ua tiav ntxiv kom tshem tawm cov impurities thiab npaj rau kev hloov kho tshuaj.
Lub synthesis ntawm hydroxyethylcellulose koom nrog cov tshuaj tiv thaiv ntawm cellulose nrog ethylene oxide nyob rau hauv kev tswj tej yam kev mob. Ethylene oxide yog ib qho organic compound nrog cov tshuaj formula C2H4O, feem ntau siv los tsim ntau yam tshuaj lom neeg. Thaum reacted nrog cellulose, ethylene oxide ntxiv hydroxyethyl (-OHCH2CH2) pawg mus rau cellulose qaum, uas ua rau tsim hydroxyethylcellulose. Lub degree ntawm kev hloov, uas yog hais txog cov naj npawb ntawm hydroxyethyl pawg ntxiv rau ib chav tsev piam thaj hauv cov saw cellulose, tuaj yeem tswj tau thaum lub sijhawm txheej txheem synthesis los kho cov khoom ntawm cov khoom kawg.
Kev hloov kho tshuaj ntawm cellulose los tsim hydroxyethylcellulose imparts ntau yam zoo rau cov polymer. Cov khoom no suav nrog kev nce dej solubility, txhim kho thickening thiab gelling muaj peev xwm, txhim khu kev ruaj ntseg ntawm ntau yam pH thiab kub kub, thiab kev sib raug zoo nrog ntau yam ntawm lwm cov khoom xyaw uas nquag siv hauv formulations. Cov yam ntxwv no ua rau hydroxyethylcellulose muaj ntau yam ntxiv nrog rau ntau daim ntawv thov thoob plaws kev lag luam sib txawv.
Hauv kev lag luam tshuaj pleev ib ce, hydroxyethylcellulose yog dav siv los ua tus neeg sawv cev thickening, stabilizer, thiab emulsifier hauv ntau yam khoom siv tu tus kheej xws li tshuaj zawv plaub hau, tshuaj pleev, tshuaj pleev, tshuaj pleev, thiab gels. Nws lub peev xwm los hloov kho cov viscosity thiab kev ntxhib los mos ntawm formulations tso cai rau kev tsim cov khoom lag luam nrog cov yam ntxwv uas xav tau thiab kev ua haujlwm zoo. Tsis tas li ntawd, hydroxyethylcellulose tuaj yeem ua tus neeg sawv cev ua yeeb yaj kiab, muab kev tiv thaiv ntawm daim tawv nqaij lossis plaub hau.
Nyob rau hauv cov tshuaj formulations, hydroxyethylcellulose yog siv raws li ib tug binder nyob rau hauv cov ntsiav tshuaj manufacturing, qhov uas nws pab tuav lub active cov khoom xyaw ua ke thiab txhim kho cov neeg kho tshuab zog ntawm cov ntsiav tshuaj. Nws kuj tseem ua hauj lwm los ua tus neeg sawv cev ncua hauv cov kua formulations los tiv thaiv qhov teeb meem ntawm cov khoom siv thiab ua kom muaj kev sib faib ntawm cov khoom xyaw nquag. Tsis tas li ntawd, hydroxyethylcellulose ua hauj lwm pab raws li ib tug viscosity modifier nyob rau hauv ophthalmic daws thiab tshuaj pleev gels, pab txhawb lawv lubricating zog thiab ncua sij hawm nyob rau hauv lub ocular nto los yog daim tawv nqaij.
Hauv kev lag luam khoom noj khoom haus, hydroxyethylcellulose pom cov ntawv thov ua cov thickener, stabilizer, thiab gelling tus neeg sawv cev hauv ntau yam khoom noj, nrog rau cov kua ntses, hnav khaub ncaws, khoom qab zib, thiab dej haus. Nws tuaj yeem txhim kho qhov kev ntxhib los mos, qhov ncauj qhov ntswg, thiab txee ruaj khov ntawm cov khoom noj uas tsis muaj kev cuam tshuam rau lawv saj lossis tsw. Hydroxyethylcellulose feem ntau lees paub tias muaj kev nyab xeeb (GRAS) rau kev siv hauv cov zaub mov los ntawm cov cai tswj hwm xws li US Food and Drug Administration (FDA) thiab European Food Safety Authority (EFSA).
Hydroxyethylcellulose yog ib qho tseem ceeb ntawm cellulose derivative muab los ntawm cov khoom siv cellulose los ntawm kev hloov tshuaj lom neeg nrog ethylene oxide. Nws cov khoom tshwj xeeb rheological ua rau nws muaj ntau yam additives hauv tshuaj pleev ib ce, tshuaj, thiab khoom noj khoom haus, qhov twg nws ua hauj lwm raws li ib tug thickener, stabilizer, binder, emulsifier, thiab gelling agent. Nrog nws cov kev siv ntau yam thiab kev ruaj ntseg profile, hydroxyethylcellulose tseem yog cov khoom tseem ceeb hauv ntau cov neeg siv khoom thiab cov qauv tsim.
Post lub sij hawm: Apr-12-2024