Hydroxyethyl cellulose (HEC) yog cov khoom siv polymer uas tsis yog ionic uas yaj tau hauv dej uas siv dav hauv cov tshuaj pleev ib ce, tshuaj, xim, tshuaj pleev ib ce, kev tsim kho thiab lwm yam teb. Nws muaj cov khoom zoo heev uas ua rau tuab, ncua, tawg, emulsification, tsim zaj duab xis, khaws dej thiab lwm yam khoom, yog li nws tau dhau los ua tus neeg sawv cev tseem ceeb hauv ntau yam lag luam. Txawm li cas los xij, hydroxyethyl cellulose tsis tau txais ncaj qha los ntawm cov khoom siv ntuj, tab sis tau txais los ntawm kev hloov kho tshuaj cellulose ntuj. Txhawm rau kom nkag siab txog qhov chaw ntuj ntawm hydroxyethyl cellulose, peb yuav tsum nkag siab txog qhov chaw thiab cov qauv ntawm cellulose.
Qhov chaw ntuj tsim ntawm cellulose
Cellulose yog ib qho ntawm cov polymers organic uas muaj ntau tshaj plaws hauv ntiaj teb thiab muaj ntau nyob rau hauv cov phab ntsa cell ntawm cov nroj tsuag, tshwj xeeb tshaj yog nyob rau hauv cov nroj tsuag ntoo, paj rwb, flax thiab lwm yam fibers ntawm cov nroj tsuag. Nws yog ib qho tseem ceeb hauv cov qauv ntawm cov nroj tsuag thiab muab lub zog thiab kev ruaj khov. Lub hauv paus ntawm cellulose yog ib qho glucose molecule, uas txuas nrog los ntawm β-1,4-glycosidic bonds los tsim ib qho saw ntev. Raws li cov khoom siv polymer ntuj, cellulose muaj cov khoom zoo heev thiab cov tshuaj lom neeg, ua rau nws yog cov khoom siv raw tseem ceeb rau ntau yam derivatives.
Cov txheej txheem npaj ntawm hydroxyethyl cellulose
Txawm hais tias cellulose nws tus kheej muaj ntau yam zoo heev, nws qhov kev siv tau txwv rau qee qhov. Qhov laj thawj tseem ceeb yog tias cellulose muaj kev yaj tsis zoo, tshwj xeeb tshaj yog kev yaj tsawg hauv dej. Txhawm rau txhim kho cov yam ntxwv no, cov kws tshawb fawb hloov kho cellulose los npaj ntau yam cellulose derivatives. Hydroxyethyl cellulose yog cov cellulose ether uas yaj tau hauv dej los ntawm kev sib xyaw ethoxylating cellulose ntuj los ntawm kev tshuaj lom neeg.
Hauv cov txheej txheem npaj tshwj xeeb, cov cellulose ntuj yog yaj ua ntej hauv cov kua alkali, thiab tom qab ntawd ethylene oxide ntxiv rau hauv qhov system reaction. Ethoxylation reaction ntawm ethylene oxide thiab hydroxyl pawg hauv cellulose tshwm sim los tsim hydroxyethyl cellulose. Qhov kev hloov kho no ua rau hydrophilicity ntawm cellulose saw, yog li txhim kho nws cov solubility thiab viscosity hauv dej.
Cov khoom siv raw tseem ceeb
Cov khoom siv tseem ceeb rau kev npaj cov hydroxyethyl cellulose yog cellulose, thiab cov khoom siv ntuj ntawm cellulose suav nrog:
Ntoo: Cov cellulose hauv ntoo yog siab, tshwj xeeb tshaj yog nyob rau hauv coniferous thiab broad-leaved ntoo, qhov twg cellulose tuaj yeem ncav cuag 40% -50%. Ntoo yog ib qho ntawm cov khoom tseem ceeb tshaj plaws ntawm cellulose hauv kev lag luam, tshwj xeeb tshaj yog nyob rau hauv papermaking thiab kev tsim cov cellulose derivatives.
Paj Rwb: Cov paj rwb fiber yuav luag yog tsim los ntawm cov cellulose ntshiab, thiab cov cellulose ntsiab lus hauv paj rwb yog siab li ntau dua 90%. Vim nws qhov purity siab, paj rwb fiber feem ntau yog siv los npaj cov cellulose derivatives zoo.
Cov fibers cog xws li flax thiab hemp: Cov fibers cog no kuj muaj cellulose ntau, thiab vim tias cov fibers cog no feem ntau muaj lub zog siab, lawv kuj muaj qee qhov zoo hauv kev rho tawm cellulose.
Cov khib nyiab ua liaj ua teb: suav nrog cov quav ciab, cov quav ciab nplej, cov quav ciab pob kws, thiab lwm yam. Cov ntaub ntawv no muaj qee qhov cellulose, thiab cellulose tuaj yeem rho tawm ntawm lawv los ntawm cov txheej txheem kho kom zoo, muab cov khoom siv pheej yig thiab rov ua dua tshiab rau kev tsim cov cellulose derivatives.
Cov cheeb tsam siv ntawm hydroxyethyl cellulose
Vim yog cov khoom tshwj xeeb ntawm hydroxyethyl cellulose, nws yog siv dav hauv ntau qhov chaw. Cov hauv qab no yog ntau qhov chaw siv loj:
Kev lag luam tsim kho: Hydroxyethyl cellulose yog siv dav hauv cov ntaub ntawv tsim kho ua cov khoom siv tuab thiab cov dej-tuav tus neeg sawv cev, tshwj xeeb tshaj yog hauv cov cement mortar, gypsum, putty hmoov thiab lwm yam ntaub ntawv, uas tuaj yeem txhim kho kev tsim kho thiab cov khoom tuav dej ntawm cov ntaub ntawv.
Kev lag luam tshuaj txhua hnub: Hauv cov tshuaj ntxuav tes, cov khoom tu tawv nqaij, tshuaj zawv plaub hau thiab lwm yam khoom siv tshuaj txhua hnub, hydroxyethyl cellulose yog siv los ua cov khoom tuab thiab stabilizer los txhim kho qhov kev xav thiab kev ruaj khov ntawm cov khoom.
Xim thiab txheej: Hauv kev lag luam txheej, hydroxyethyl cellulose yog siv los ua cov khoom siv tuab thiab tus neeg sawv cev tswj kev rheology los txhim kho kev ua haujlwm ntawm txheej thiab zam kev sagging.
Kev lag luam tshuaj: Hauv kev npaj tshuaj, hydroxyethyl cellulose tuaj yeem siv los ua tus binder, thickener thiab suspending agent rau cov ntsiav tshuaj los txhim kho cov yam ntxwv tso tawm thiab kev ruaj khov ntawm cov tshuaj.
Txawm hais tias hydroxyethyl cellulose tsis yog ib yam khoom uas muaj nyob hauv ntuj tsim, nws cov khoom siv raw, cellulose, muaj ntau nyob hauv cov nroj tsuag hauv xwm. Los ntawm kev hloov pauv tshuaj lom neeg, cellulose ntuj tuaj yeem hloov mus ua hydroxyethyl cellulose nrog kev ua tau zoo heev thiab siv rau hauv ntau yam lag luam. Cov nroj tsuag ntuj xws li ntoo, paj rwb, flax, thiab lwm yam muab cov khoom siv raw nplua nuj rau kev tsim cov hydroxyethyl cellulose. Nrog rau kev nce qib ntawm kev tshawb fawb thiab thev naus laus zis thiab kev nce ntxiv ntawm kev thov kev lag luam, cov txheej txheem tsim cov hydroxyethyl cellulose kuj tseem raug kho kom zoo tas li, thiab nws xav tias yuav qhia nws tus nqi tshwj xeeb hauv ntau qhov chaw yav tom ntej.
Lub sijhawm tshaj tawm: Lub Kaum Hli-23-2024