Npaj cov cellulose neeg muaj kev pab cuam

Kev npaj ntawmNeeg muaj neeg ua haujlwmYuav siv cov tshuaj kho mob kho lub ntuj polymer cellulose los ntawm etherification kev tiv thaiv. Cov txheej txheem no qhia txog cov pab pawg ether rau hauv cov pawg hydroxyl ntawm cov hlua ntawm cov cellulose, coj mus rau kev tsim cov kws muaj kev cuam tshuam ntawm cellulose nrog cov khoom muaj txiaj ntsig. Feem ntau cov ntaub ntawv ntawm lub xov tooj ntawm cov xov tooj ntawm cov xov tooj ntawm cov xov tooj me hydroxyylcellulose (HECC), cov celluleethethyl cellulose (MC), thiab cov cellulose cellulose (EC). Ntawm no yog ib qho dav dav ntawm txheej txheem npaj:

1. Cellule Sourcing:

• Cov txheej txheem pib nrog sourcing cellulose, uas yog feem ntau muab los ntawm ntoo pulp lossis paj rwb. Qhov kev xaiv ntawm cov hauv paus cellulose tuaj yeem cuam tshuam cov khoom ntawm lub cellule cellulose khoom ether.

2. Pulping:

• Lub cellulose yog raug rau pulping cov txheej txheem kom tawg cov fibers rau hauv ib daim ntawv tswj xyuas ntxiv. Qhov no tej zaum yuav muaj kev siv tshuab lossis cov txheej txheem tshuaj lom neeg.

3. Purification:

• Lub cellulose yog lim kom tshem tawm impurities, tsau, thiab lwm yam tsis yog-cellulosic cheeb tsam. Cov kauj ruam ua kom muaj kev ua kom muaj zog yog qhov tseem ceeb kom tau txais cov khoom siv cellulose zoo.

4. Ethetification tiv thaiv:

• Lub cellulose cellulose undergulose etgoes etherification, uas muaj ether pawg tau qhia rau cov pawg hydroxyl ntawm lub cellulose saw. Qhov kev xaiv ntawm lub hnub ci tus neeg sawv cev thiab cov tshuaj tiv thaiv no yog nyob ntawm cov khoom xav tau ether ether.
• Common etherifying agents include ethylene oxide, propylene oxide, sodium chloroacetate, methyl chloride, and others.

5. Tswj ntawm cov tshuaj tsis haum:

• Lub here cov tshuaj tiv thaiv yog ua tib zoo tswj hwm nyob rau hauv cov nqe lus ntawm qhov kub, siab, thiab pH kom ua tiav cov qib xav tau (DS) thiab zam dhau kev phiv.
• Alkaline tej yam mob feem ntau ua haujlwm, thiab ph ntawm cov tshuaj tiv thaiv sib xyaw yog cov tshuaj xyuas zoo.

6. Neutralization thiab ntxuav:

• Tom qab lub Ehereification cov tshuaj tiv thaiv, cov khoom lag luam yog feem ntau cia li tshem tawm ntau dhau kev xav tau lossis cov khoom lag luam. Cov kauj ruam no tau ua raws los ntawm kev ntxuav kom huv los tshem tawm cov tshuaj uas tseem ceeb thiab tsis txaus ntseeg.

7. Kom Qhuav:

• Kev ua kom huv thiab nruab nrab cellulose tau qhuav kom tau txais cov khoom kawg kawg ether ether cov khoom hauv cov hmoov lossis cov ntawv pob zeb.

8. Tswjhwm Zoo:

• Ntau cov tswv yim kev kuaj xyuas tau ua haujlwm rau kev tswj hwm zoo, suav nrog kev sib nqus Nuclear sib nqus (NMR) spectroscopy, ftir) specroscopy, thiab chromatography.
• Cov degree ntawm kev hloov pauv (DS) yog ib qho kev soj ntsuam tseem ceeb thaum lub sij hawm ntau lawm.

9. Cov Qauv thiab Ntim:

• Lub cellulose ether yog tom qab tsim los ua cov qib sib txawv kom tau raws li cov kev xav tau ntawm ntau yam kev siv. Cov khoom kawg yog ntim rau kev faib tawm.

Qhov kev npaj ntawm cellulose cov txheej txheem ntawm cov txheej txheem muaj cov tshuaj uas yuav tsum tau ua tib zoo tswj cov tshuaj tiv thaiv kev xav tau. Cov neeg muaj feem ntawm cov cellulose muaj rau lawv siv ntau cov kev thov hla kev lag luam, suav nrog cov khoom noj tshuaj, tsim kho, thiab ntau dua.