Hydroxyethyl cellulose (HEC) yog cov dej-soluble nonionic cellulose ether, thiab nws qhov chaw tseem ceeb yog ntuj cellulose. Ntuj cellulose yog dav nyob rau hauv cov nroj tsuag thiab yog lub ntsiab ntawm cov nroj tsuag cell phab ntsa. Tshwj xeeb, hydroxyethyl cellulose yog tsim los ntawm chemically reacting natural cellulose nrog ethylene oxide nyob rau hauv alkaline tej yam kev mob. Cov txheej txheem tshuaj lom neeg no feem ntau hu ua ethoxylation, thiab qhov tshwm sim yog tias cov pab pawg hydroxyl ntawm lub ntuj cellulose molecules yog ib feem los yog tag nrho hloov mus rau hydroxyethyl cellulose nrog ethoxy pawg.
Cov hauv qab no yog cov kauj ruam tshwj xeeb ntawm kev npaj ntawm hydroxyethyl cellulose:
Qhov chaw ntawm cellulose: Cellulose feem ntau yog muab rho tawm los ntawm cov khoom siv cog xws li paj rwb thiab ntoo. Cov cellulose muab rho tawm yog purified thiab bleached kom tshem tawm impurities xws li lignin, hemicellulose thiab lwm yam uas tsis yog-cellulose Cheebtsam kom tau high-purity cellulose.
Kev kho Alkalinization: Sib tov cellulose nrog concentrated sodium hydroxide (NaOH) tov, thiab cov pab pawg hydroxyl hauv cellulose react nrog sodium hydroxide los tsim sodium cellulose. Hauv cov txheej txheem no, cov qauv cellulose molecular nthuav dav rau qee qhov, ua rau nws yooj yim dua rau cov tshuaj ethylene oxide.
Ethoxylation cov tshuaj tiv thaiv: Alkalized sodium cellulose yog tov nrog ethylene oxide (C2H4O) ntawm qhov kub thiab txias. Lub nplhaib qauv ntawm ethylene oxide qhib los tsim ethoxy pawg (-CH2CH2OH), uas ua ke nrog cov hydroxyl pawg ntawm cov cellulose molecules los tsim hydroxyethyl cellulose. Cov txheej txheem tshuaj tiv thaiv no tuaj yeem nqa mus rau qhov sib txawv, ua rau hydroxyethyl cellulose nrog ntau qib hloov pauv.
Tom qab kev kho mob: Cov khoom tom qab cov tshuaj tiv thaiv feem ntau muaj unreacted alkali, kuab tshuaj thiab lwm yam by-products. Yuav kom tau txais cov ntshiab hydroxyethyl cellulose, cov kauj ruam tom qab kev kho mob xws li neutralization, ntxuav thiab ziab yuav tsum tau ua. Lub hom phiaj ntawm cov kauj ruam kev kho mob no yog tshem tawm cov seem alkali, cov kuab tshuaj thiab cov khoom los ntawm cov khoom kom tau txais cov khoom siv lim dej kawg.
Hydroxyethyl cellulose tau siv dav hauv ntau qhov kev lag luam vim nws cov khoom siv tshuaj lom neeg tshwj xeeb thiab kev ua haujlwm zoo heev. Tshwj xeeb, hydroxyethyl cellulose muaj cov dej zoo solubility, thickening, stability, film-forming thiab lubrication, thiab feem ntau yog siv rau hauv cov nram qab no:
Cov ntaub ntawv hauv tsev: Hauv cov khoom siv hauv tsev, hydroxyethyl cellulose feem ntau yog siv los ua cov thickener thiab dej tuav tus neeg sawv cev rau cov khoom siv cement thiab cov ntaub ntawv gypsum. Nws tuaj yeem txhim kho kev tsim kho ntawm cov ntaub ntawv zoo, txhim kho cov dej tuav, kev ua haujlwm thiab kev tiv thaiv sagging ntawm mortar, ncua lub sijhawm qhib thiab ua kom cov kev txhim kho du.
Kev lag luam xim: Hauv cov xim, hydroxyethyl cellulose yog siv los ua cov thickener, tshem tawm tus neeg sawv cev thiab emulsifier los txhim kho cov rheology thiab ruaj khov ntawm cov xim, tiv thaiv cov xim sedimentation, thiab txhim khu lub flatness thiab gloss ntawm txheej.
Tshuaj pleev ib ce thiab cov khoom tu tus kheej: Hauv cov tshuaj pleev ib ce, hydroxyethyl cellulose feem ntau yog siv los ua cov thickener, zaj duab xis qub thiab moisturizer. Nws tuaj yeem muab cov khoom muaj kev xav zoo, txhim kho cov khoom ruaj khov thiab adhesion, thiab txhim khu cov nyhuv moisturizing.
Kev lag luam kws tshuaj: Hauv kev lag luam tshuaj, hydroxyethyl cellulose yog siv los ua ib qho ntxiv rau kev npaj tshuaj. Raws li ib feem ntawm sustained-tso ntsiav tshuaj, zaj duab xis txheej, thiab lwm yam, nws muaj peev xwm tswj tau qhov tso tawm cov tshuaj thiab txhim kho stability thiab bioavailability ntawm cov tshuaj.
Kev lag luam khoom noj khoom haus: Hauv kev lag luam khoom noj khoom haus, hydroxyethyl cellulose yog siv los ua cov khoom noj ntxiv los ua lub luag haujlwm hauv thickening, emulsification thiab stabilization. Nws yog dav siv hauv dej haus, condiments, khoom noj siv mis thiab lwm yam khoom noj los txhim kho kev ntxhib los mos thiab saj ntawm cov khoom.
Hydroxyethyl cellulose tseem muaj cov ntawv thov tseem ceeb hauv cov roj extraction, papermaking, textile printing thiab dyeing industries. Hauv kev tshem tawm cov roj, hydroxyethyl cellulose yog siv los ua cov thickener thiab stabilizer rau cov dej drilling, uas tuaj yeem txhim kho lub peev xwm ntawm cov dej drilling thiab tiv thaiv cov phab ntsa zoo. Hauv kev lag luam papermaking, nws yog siv los ua tus neeg saib xyuas kev tuav pov hwm thiab cov neeg sawv cev txhawb nqa los txhim kho lub zog thiab ua haujlwm ntawm daim ntawv. Hauv textile printing thiab dyeing, hydroxyethyl cellulose yog siv los ua cov thickener los pab cov luam ntawv thiab dyeing slurry kom sib npaug sib npaug thiab txhim kho kev luam ntawv thiab dyeing zoo.
Hydroxyethyl cellulose yog tau los ntawm ntuj cellulose los ntawm ib tug series ntawm tshuaj tiv thaiv. Nws daim ntawv thov dav tsis yog vim nws lub cev zoo thiab tshuaj lom neeg, tab sis kuj vim tias nws tuaj yeem muab ntau txoj kev daws teeb meem hauv ntau qhov kev lag luam kom tau raws li cov kev xav tau sib txawv.
Post lub sij hawm: Aug-13-2024