Hydroxyethyl cellulose (HEC) yog cov dej tsis-ionic-soluble polymer cov khoom siv hauv cov tshuaj pleev ib ce, cov tshuaj pleev xim, tsim kho thiab lwm thaj teb. Nws muaj qhov zoo heev thickening, ncua kev ncua, dispersion, zaj duab xis, ua yeeb yaj kiab, kom muaj tus neeg sawv cev tseem ceeb hauv ntau qhov kev lag luam. Txawm li cas los xij, hydroxyethyl cellulose tsis tau ncaj qha los ntawm ntuj cov ntaub ntawv, tab sis yog tau los ntawm kev hloov kho lub cev. Txog rau qhov kawg no, kom nkag siab txog lub ntuj ntawm hydroxyethyl cellulose, peb ua ntej yuav tsum nkag siab txog qhov chaw thiab cov qauv ntawm cellulose.
Ntuj ntawm cellulose
Cellulose yog ib qho ntawm cov organic ntau tshaj plaws hauv ntiaj teb thiab tau dav nyob hauv cov ntoo ntawm cov ntoo, tshwj xeeb yog cov paj rwb, flax thiab lwm cov nroj tsuag fibers. Nws yog qhov tseem ceeb tivthaiv hauv cov qauv cog thiab muab cov tshuab muaj zog thiab ruaj khov. Chav tsev yooj yim ntawm cov floulose yog cov piam thaj molecule, uas txuas nrog los ntawm β-1,4-glycosidic bonds los ua tus qauv ntev. Raws li cov khoom siv xyoob ntoo polymer, cellulose muaj cov khoom siv lub cev thiab tshuaj zoo heev, ua rau nws yog cov khoom tseem ceeb rau ntau yam kev sib tw.
Npaj txheej txheem ntawm hydroxyethyl cellulose
Txawm hais tias cellulose nws tus kheej muaj ntau cov yam ntxwv zoo heev, nws daim ntawv thov ntau yog txwv rau qee yam. Lub ntsiab yog vim li cas yog tias cellulose muaj cov tub rog tsis zoo, tshwj xeeb yog solubility hauv dej. Txhawm rau txhim kho cov cuab yeej no, cov kws tshawb fawb co cov kws tshaj lij hloov cellulose los npaj ntau cov cellulose derivatives. Hydroxyethyl cellulose yog dej-soluble cellulose cellulose tau los ntawm cov cellulose ntuj los ntawm kev tshuaj lom neeg.
Hauv cov txheej txheem npaj tshwj xeeb, cov xov xwm ntuj yog thawj zaug ua ntej nyob rau hauv alkali daws, thiab tom qab ntawd ethylene oxide yog ntxiv rau cov tshuaj tiv thaiv kab mob. Cov tshuaj uthoxylation ntawm ethylene oxide thiab hydroxyl pawg hauv cellulose tshwm sim los tsim hydroxyethyl cellulose. Qhov kev hloov pauv no nce lub hydrophilicity ntawm cellulose chains, yog li kev txhim kho nws solubility thiab viscosity cov khoom hauv dej.
Lub ntsiab raw khoom siv
Cov tub ntxhais ntuj raw rau kev npaj ntawm hydroxyethyl cellulose yog cellulose, thiab cov khoom ntawm cellulose muaj xws li:
Ntoo: Lub cellulose ntsiab lus nyob rau hauv ntoo yog siab, tshwj xeeb tshaj yog nyob rau hauv ntoo thiab dav-leaved ntoo, uas lub cellulose tuaj yeem ncav 40% -50%. Ntoo yog ib qho tseem ceeb tshaj plaws ntawm cellulose hauv kev lag luam, tshwj xeeb tshaj yog nyob rau hauv papermaking thiab kev tsim cov tshuaj cellulose derivatives.
Paj rwb: paj rwb fiber ntau yuav luag sib xyaw ntawm cellulose, thiab cov cellulose ntsiab lus hauv paj rwb yog qhov siab ntau dua 90%. Vim nws lub siab purity, paj rwb fiber ntau yog siv los npaj cov kev ua kom zoo ntawm cellulose derivatives.
Cov nplais cog xws li Flax thiab Hemp: Cov nroj tsuag ntoo no tseem muaj kev nplua nuj nyob rau hauv cov khoom siv hluav taws xob, lawv kuj muaj qee qhov zoo hauv cov cellulose tawm.
Kev ua liaj ua teb pov tseg: Cov.
Daim ntawv thov cov chaw ntawm hydroxyethyl cellulose
Vim yog cov khoom tshwj xeeb ntawm cov xov xwm hydroxyethyl cellulose, nws yog siv dav hauv ntau thaj teb. Cov hauv qab no yog ntau qhov chaw thov loj:
Kev lag luam tsim kev tsim kho: Hydroxyethyl cellulose yog siv dav hauv cov ntaub ntawv tsim ua tsev, tshwj xeeb yog txhim kho cov hmoov av thiab dej-khaws cov khoom ntawm cov ntaub ntawv.
Kev lag luam txhua hnub: nyob rau hauv cov khoom noj tshuaj, cov tshuaj ntxuav tawv nqaij thiab lwm cov khoom siv tshuaj lom neeg txhua hnub, cellener cellulose yog siv los txhim kho cov khoom lag luam thiab kev ruaj khov.
Xim thiab pleev xim: nyob rau hauv cov txheej txheej kev lag luam, hydroxyethyl cellulose yog siv los ua cov neeg sawv cev tuab thiab rhie kev tswj hwm los txhim kho cov txheej txheem ntawm cov txheej thiab zam kev sagging.
Kws Kho Mob Tshuaj: Hauv kev npaj tshuaj, hydroxyethyl cellulose tuaj yeem siv los ua cov binder, thickener thiab ncua cov tshuaj kom txhim kho cov yam ntxwv tso thiab muaj kev ruaj khov ntawm cov tshuaj.
Txawm hais tias hydroxyethyl cellulose tsis yog ib txwm muaj tshwm sim, nws cov khoom siv rawing, cellulose, yog dav tam sim no hauv cov nroj tsuag hauv cov tsiaj. Los ntawm kev hloov kho tshuaj lom neeg, ntuj cellulose tuaj yeem hloov mus rau hydroxyethyl cellulose nrog kev ua tau zoo thiab thov hauv ntau yam kev lag luam. Nroj tsuag ntuj xws li ntoo, paj rwb, flax, etc. Muab cov ntaub ntawv nplua nuj ntawm cov khoom siv roj raw rau kev tsim cov hydroxyethyl cellulose. Nrog kev nce qib ntawm kev tshawb fawb thiab thev naus laus zis thiab kev nce qib ntawm cov txheej txheem hydroxyethyl ntawm cov khoom siv tsis tu ncua, thiab nws yuav tsum tau ua kom pom nws tus nqi tshwj xeeb hauv cov pej xeem hauv yav tom ntej.
Lub Sijhawm Post: Kaum-23-2024