Hydroxyethyl cellulose (HEC) yog cov khoom siv tsis-ionic dej-soluble polymer cov khoom siv dav siv hauv tshuaj pleev ib ce, tshuaj, pleev xim, txheej, kev tsim kho thiab lwm yam. Nws muaj cov thickening zoo heev, ncua kev kawm ntawv, dispersion, emulsification, film-forming, dej tuav thiab lwm yam khoom, yog li nws tau dhau los ua tus neeg sawv cev tseem ceeb hauv ntau lub lag luam. Txawm li cas los xij, hydroxyethyl cellulose tsis tau ncaj qha los ntawm cov ntaub ntawv ntuj, tab sis tau txais los ntawm kev hloov kho cov cellulose. Txog qhov kawg no, kom nkag siab txog lub ntuj tsim ntawm hydroxyethyl cellulose, peb yuav tsum xub nkag siab txog qhov chaw thiab cov qauv ntawm cellulose.
Ntuj qhov chaw ntawm cellulose
Cellulose yog ib qho ntawm feem ntau cov organic polymers nyob rau hauv lub ntiaj teb no thiab yog dav nyob rau hauv lub cell phab ntsa ntawm cov nroj tsuag, tshwj xeeb tshaj yog nyob rau hauv woody nroj tsuag, paj rwb, flax thiab lwm yam nroj tsuag fibers. Nws yog ib qho tseem ceeb hauv cov qauv cog thiab muab txhua yam muaj zog thiab ruaj khov. Lub hauv paus chav tsev ntawm cellulose yog cov piam thaj molecule, uas txuas nrog β-1,4-glycosidic bonds los tsim ib txoj hlua ntev. Raws li cov khoom siv polymer ntuj, cellulose muaj lub cev zoo thiab tshuaj lom neeg, ua rau nws yog ib qho tseem ceeb raw khoom rau ntau yam derivatives.
Kev npaj ntawm hydroxyethyl cellulose
Txawm hais tias cellulose nws tus kheej muaj ntau yam zoo heev, nws daim ntawv thov ntau yog txwv rau qee yam. Qhov laj thawj tseem ceeb yog tias cellulose muaj cov solubility tsis zoo, tshwj xeeb tshaj yog txwv tsis pub solubility hauv dej. Txhawm rau txhim kho cov cuab yeej no, cov kws tshawb fawb tau hloov kho cellulose los npaj ntau yam cellulose derivatives. Hydroxyethyl cellulose yog dej-soluble cellulose ether tau los ntawm ethoxylating natural cellulose los ntawm tshuaj tiv thaiv.
Hauv cov txheej txheem tshwj xeeb, cov cellulose yog thawj zaug yaj hauv cov kua alkali, thiab tom qab ntawd ethylene oxide ntxiv rau cov tshuaj tiv thaiv. Ethoxylation cov tshuaj tiv thaiv ntawm ethylene oxide thiab hydroxyl pawg hauv cellulose tshwm sim los tsim hydroxyethyl cellulose. Qhov kev hloov kho no nce hydrophilicity ntawm cellulose chains, yog li txhim kho nws cov solubility thiab viscosity zog hauv dej.
Main raw khoom
Cov khoom tseem ceeb ntawm cov khoom siv raw rau kev npaj ntawm hydroxyethyl cellulose yog cellulose, thiab lub ntuj tsim ntawm cellulose muaj xws li:
Ntoo: Cov ntsiab lus cellulose hauv ntoo yog siab, tshwj xeeb tshaj yog nyob rau hauv coniferous thiab broad-leaved ntoo, qhov twg cov cellulose tuaj yeem ncav cuag 40% -50%. Ntoo yog ib qho tseem ceeb tshaj plaws ntawm cellulose nyob rau hauv kev lag luam, tshwj xeeb tshaj yog nyob rau hauv papermaking thiab zus tau tej cov cellulose derivatives.
Paj Rwb: Cov paj rwb fiber ntau yuav luag tsim los ntawm cov cellulose ntshiab, thiab cov ntsiab lus cellulose hauv paj rwb yog siab li ntau tshaj 90%. Vim nws cov purity siab, paj rwb fiber ntau yog siv los npaj cov khoom zoo cellulose derivatives.
Cov nroj tsuag fibers xws li flax thiab hemp: Cov nroj tsuag fibers no kuj nplua nuj nyob rau hauv cellulose, thiab vim hais tias cov nroj tsuag fibers feem ntau muaj lub zog txhua yam, lawv kuj muaj qee yam zoo hauv cellulose extraction.
Agricultural pov tseg: suav nrog straw, nplej straw, pob kws straw, thiab lwm yam. Cov ntaub ntawv no muaj qee yam ntawm cellulose, thiab cellulose tuaj yeem muab rho tawm los ntawm lawv los ntawm cov txheej txheem kho kom tsim nyog, muab cov khoom pheej yig thiab rov ua dua tshiab rau cov khoom siv cellulose derivatives. .
Siv thaj chaw ntawm hydroxyethyl cellulose
Vim muaj cov khoom tshwj xeeb ntawm hydroxyethyl cellulose, nws tau siv dav hauv ntau lub teb. Cov hauv qab no yog ob peb qhov kev thov tseem ceeb:
Kev tsim kho kev lag luam: Hydroxyethyl cellulose yog siv dav hauv cov khoom siv hauv tsev ua cov thickener thiab cov dej tuav cov neeg sawv cev, tshwj xeeb tshaj yog nyob rau hauv cement mortar, gypsum, putty hmoov thiab lwm yam ntaub ntawv, uas tuaj yeem txhim kho kev tsim kho thiab dej tuav cov khoom 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 thickener thiab stabilizer los txhim kho cov khoom zoo thiab ruaj khov.
Xim thiab coatings: Hauv kev lag luam coatings, hydroxyethyl cellulose yog siv los ua cov thickener thiab rheology tswj tus neeg saib xyuas txhawm rau txhim kho kev ua haujlwm ntawm cov txheej thiab tsis txhob sagging.
Pharmaceutical teb: Hauv kev npaj tshuaj, hydroxyethyl cellulose tuaj yeem siv los ua cov ntawv khi, thickener thiab tshem tawm tus neeg sawv cev rau cov ntsiav tshuaj los txhim kho cov yam ntxwv tso tawm thiab kev ruaj ntseg ntawm cov tshuaj.
Txawm hais tias hydroxyethyl cellulose tsis yog ib yam khoom tshwm sim, nws cov khoom siv raw, cellulose, yog dav nyob rau hauv cov nroj tsuag nyob rau hauv cov xwm. Los ntawm kev hloov kho tshuaj, ntuj cellulose tuaj yeem hloov mus rau hydroxyethyl cellulose nrog kev ua haujlwm zoo thiab siv rau hauv ntau yam lag luam. Cov nroj tsuag ntuj xws li ntoo, paj rwb, flax, thiab lwm yam. muab ib qho kev nplua nuj ntawm cov khoom siv raw rau kev tsim cov hydroxyethyl cellulose. Nrog rau kev nce qib ntawm kev tshawb fawb thiab thev naus laus zis thiab kev xav tau ntawm kev lag luam, cov txheej txheem tsim tawm ntawm hydroxyethyl cellulose tseem tau ua kom zoo dua qub, thiab nws yuav tsum qhia nws cov txiaj ntsig tshwj xeeb hauv ntau thaj chaw yav tom ntej.
Post lub sij hawm: Oct-23-2024