I. Kev qhia lus
Hydroxyethyl cellulose (HEC) yog cov dej tsis-ionic-soluble polymer dav siv hauv cov roj tawm, kev tsim kho, papermaking thiab lwm thaj teb. HEC tau txais los ntawm kev hloov kho tshuaj lom neeg ntawm cellulose, thiab nws cov khoom thiab siv yog feem ntau txiav txim siab los ntawm hydroxyethyl chaw nyob ntawm cellulose molecules.
Ii. Cov txheej txheem ntau lawm
Cov txheej txheem ntau lawm suav nrog cov kauj ruam hauv qab no: cellulose etherification, ntxuav, lub cev qhuav dej, kom qhuav thiab sib tsoo. Cov hauv qab no yog cov lus qhia ntxaws ntxaws rau txhua kauj ruam:
Cellulose heregation
Cellulose yog thawj zaug kho nrog alkali los ua alkali cellulose (cellulose alkali). Cov txheej txheem no feem ntau nqa tawm hauv cov tshuaj reactor, siv sodium hydroxide daws los kho cov pob zeb ntuj los ua alkali cellulose. Cov tshuaj lom neeg siv tau muaj raws li nram no:
Cell-Huag + Naoh → Cell-O-NA + H2OCELL-OH + → Cell-O-NA + H 2O
Tom qab ntawd, Alkali cellulose reacts nrog ethylene oxide los tsim hydroxyethyl cellulose. Cov tshuaj tiv thaiv yog nqa tawm nyob rau hauv kev kub siab, feem ntau 30-100 ° C, thiab cov tshuaj tiv thaiv tshwj xeeb yog li nram qab no:
Cell-O-NA + CH2CH2O → Cell-O-CH2CH2OHCELL-O-NA + CH 2CH 2O → Cell-O-CH 2CH 2OH
Qhov tshuaj tiv thaiv no tau ua kom tswj tau qhov kub thiab txias, siab thiab muaj txiaj ntsig ntawm ethylene ntxiv rau kom muaj kev sib xws thiab cov khoom lag luam zoo.
Ntxuav
Lub resulting crude hec feem ntau muaj unreacted alkali, Ethylene oxide thiab lwm yam los ntawm cov khoom lag luam, uas yuav tsum tau muab tshem tawm los ntawm ntau cov dej ntxuav lossis cov organic kuab ntxuav. Cov dej uas muaj ntau thaum lub sijhawm ntxuav cov dej ntxuav, thiab pov tseg tom qab ntxuav yuav tau kho thiab tawm.
Lub cev tuag
Lub Hec ntub dej ntub dej tom qab ntxuav yuav tsum muaj lub cev qhuav dej, feem ntau yog los ntawm lub tshuab nqus tsev lossis cov ntsiab lus thoob plaws centrifugal.
Kom qhuav
Hhydrated Hec yog qhuav, feem ntau los ntawm cov tshuaj tsuag ziab lossis nyem kom qhuav. Qhov kub thiab txias thiab lub sijhawm yuav tsum nruj me ntsis tswj tau thaum lub sijhawm ua kom tsis txhob muaj qhov kub thiab txias siab lossis ntxhov siab.
Kev sib tsoo
Lub HEC qhuav qhuav yuav tsum tau ua av thiab sieved kom ua tiav ib qho kev faib tawm me me, thiab thaum kawg ua cov khoom lossis cov khoom lag luam.
III. Cov yam ntxwv ua tau zoo
Dej solubility
HEC muaj cov dej ua kom zoo thiab tuaj yeem tshem tawm sai sai hauv cov dej txias thiab dej kub kom tsim lub pob tshab lossis cov tshuaj txhais tau. Cov cuab yeej siv solubility no ua rau nws dav siv los ua tuab thiab stabilizer nyob rau cov khoom siv tshuaj pleev thiab khoom siv txhua hnub.
Sam xim
Hec qhia tau cov nyhuv tuab rau cov kua aqueous, thiab nws viscosity nce nrog qhov nce ntawm molecular hnyav. Cov khoom tuab no tuaj yeem ua lub luag haujlwm hauv thickening, dej tuav thiab txhim kho kev ua haujlwm hauv cov dej pleev dej thiab lub tsev nplua nuj.
Rhuaology
HECT AQUOUSY muaj kev hloov pauv txawv, thiab nws cov viscosity hloov nrog kev hloov ntawm shear tus nqi, qhia shear thinning lossis pseudoplasticity. Cov cuab yeej rheological cov cuab yeej ua rau nws yuav kho tau cov kua thiab kev tsim kho hauv cov kua txheej thiab roj av roj.
Emulsification thiab Ncua Sijhawm
HEC muaj qhov zoo emulsification thiab tshem tawm cov khoom, uas tuaj yeem tswj cov dej tsis raug lossis cov tee dej tsis sib xws los tiv thaiv kev loj hlob thiab ua kom tiav. Yog li, HEC feem ntau siv nyob rau hauv cov khoom lag luam xws li emulsion txheej thiab yeeb tshuaj.
Biodegradity
HEC yog lub ntuj cellulose derivative nrog zoo biodegrentity, tsis muaj polluation rau ib puag ncig, thiab ua tau raws li qhov yuav tsum tau muaj kev tiv thaiv ntsuab.
IV. Daim Ntawv Thov
Txheej
Hauv cov txheej txheej hauv dej, HEC yog siv los ua cov tuab thiab khov kho kom zoo dua los txhim kho kom muaj kev ua tau zoo, kev tsim kho cov khoom ntawm cov txheej txheem.
Kev tsa tsev
Hauv cov ntaub ntawv hauv tsev, HEC yog siv hauv caas-raws cug thiab cov hmoov putty kom txhim kho kev ua haujlwm thiab dej rov ua haujlwm.
Cov Tshuaj Txhua Hnub
Hauv xab npum, tshuaj txhuam hniav, thiab cov tshuaj txhuam hniav, thiab siv tshuaj hac yog siv los ua cov tuab thiab ruaj khov txhim kho qhov kev xav thiab kev ruaj khov ntawm cov khoom.
Roj av
Nyob rau hauv cov kua dej drilling thiab pob txha taub hau fracturing, HEC yog siv los kho cov rheology thiab ncua kev tshem tawm cov pa hluav taws xob thiab txhim kho kev nyab xeeb thiab kev nyab xeeb.
Papermaking
Hauv cov txheej txheem papermakakaking, HEC yog siv los tswj cov pulp folticity thiab txhim kho cov khoom sib xws thiab cov khoom ntiag tug ntawm daim ntawv.
Hydroxyethyl cellulose (HEC) tau siv dav hauv ntau cov chaw muaj kev lag luam vim nws cov khoom siv solubility, thuv dej, emulsicalificate thiab tshem tawm cov khoom, zoo li zoo biodegradability. Nws cov txheej txheem ntau lawm yog cov laus. Los ntawm cov kauj ruam ntawm cellulose etherification, ntxuav, lub cev qhuav dej, hac cov khoom lag luam nrog kev ua tau zoo thiab muaj peev xwm npaj tau. Yav tom ntej, nrog kev txhim kho ntawm kev tiv thaiv ib puag ncig thiab kev nce qib ntawm kev siv thev naus laus zis, yuav tsum muaj kev cia siab.
Lub Sijhawm Post: Jul-02-2024