Kev Npaj Txoj Cai Ntawm Cellulose Ether

Cellulose etheryog ib tug ntau yam polymer muab tau los ntawm cellulose, ib txwm tshwm sim compound pom nyob rau hauv cov nroj tsuag.Nws yog dav siv nyob rau hauv ntau yam industries rau nws thickening, binding, stabilizing, thiab film-forming zog.Nov yog txoj hauv kev npaj dav dav rau cellulose ether:

1. Kev xaiv cov khoom siv: Cellulose feem ntau yog muab los ntawm cov khoom siv cog xws li ntoo pulp, paj rwb, lossis lwm yam fibers.Kev xaiv ntawm cov khoom siv tuaj yeem cuam tshuam cov khoom ntawm cellulose ether tsim.
2. Purification: Cov khoom uas muaj cellulose tau purification kom tshem tawm impurities xws li lignin, hemicellulose, thiab lwm yam uas tsis yog-cellulosic Cheebtsam.Cov kauj ruam no yog qhov tseem ceeb kom tau txais cov cellulose zoo rau ether ntau lawm.
3. Alkalization: Cov cellulose purified yog kho nrog alkali, feem ntau sodium hydroxide (NaOH), kom qhib cov hydroxyl pawg hauv cellulose molecules.Alkalization tsub kom qhov reactivity ntawm cellulose thiab ua rau nws yooj yim rau etherification.
4. Etherification: Etherification koom nrog kev hloov ntawm hydroxyl pawg (-OH) hauv cov saw cellulose nrog ether pawg, xws li methyl, ethyl, hydroxyethyl, lossis hydroxypropyl pawg.Cov txheej txheem no feem ntau yog ua los ntawm reacting alkali-kho cellulose nrog etherifying agents nyob rau hauv cov kev tswj, feem ntau nyob rau hauv lub xub ntiag ntawm ib tug catalyst.Cov tshuaj etherifying muaj xws li alkyl halides lossis alkylene oxides.
5. Neutralization: Tom qab etherification, cov tshuaj tiv thaiv sib tov yog neutralized kom tshem tawm cov alkali ntau dhau.Cov kauj ruam no yog qhov tseem ceeb los xyuas kom muaj kev ruaj ntseg thiab kev nyab xeeb ntawm cov khoom siv cellulose ether.
6. Ntxuav thiab ziab: Cov khoom siv cellulose ether yog ntxuav kom huv si kom tshem tau cov khoom los ntawm cov khoom, tsis muaj tshuaj reacted, los yog catalyst residues.Tom qab ntawd, cov khoom yog qhuav kom tau qhov kawg cellulose ether nyob rau hauv hmoov los yog granular daim ntawv.
7. Kev Tswjhwm Zoo: Thoob plaws hauv cov txheej txheem, kev tswj xyuas kev ua tau zoo yog siv los xyuas kom meej qhov kev xav tau ntawm kev hloov pauv, molecular hnyav faib, viscosity, thiab lwm yam khoom siv ntawm cov khoom siv cellulose ether.Cov tswv yim tshuaj ntsuam xyuas xws li Fourier-transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), thiab viscometry feem ntau yog ua haujlwm rau kev soj ntsuam zoo.
8. Ntim thiab Cia: Cov khoom lag luam cellulose ether kawg tau ntim rau hauv cov xwm txheej tsim nyog los tiv thaiv kev ya raws thiab degradation.Kev khaws cia kom zoo, xws li qhov chaw txias, qhuav, yog khaws cia kom zoo thiab txee lub neej ntawm cov khoom.

Los ntawm kev ua raws li cov kauj ruam no, cov tuam ntxhab tuaj yeem tsim cov cellulose ether nrog cov khoom tsim nyog rau ntau yam kev siv hauv kev lag luam xws li tshuaj, khoom noj, tshuaj pleev ib ce, kev tsim kho, thiab textiles.