Cellulose neeg muaj kev hais ua thiab txoj kev ua rau tib yam

Kev tsim khoom ntawmNeeg muaj neeg ua haujlwmkoom nrog kev hloov kho cov tshuaj lom neeg mus rau cellulose, ua rau muaj kev cuam tshuam nrog cov khoom ntiag tug. Hauv qab no yog ib qho kev qhia dav dav ntawm cov hau kev siv rau kev tsim cov cellulose muaj kev nyab xeeb:

1. Xaiv cov cellulose los:

• Cellulose muaj kev hais ua ke tuaj yeem muab tau los ntawm ntau qhov chaw xws li cov ntoo pulp, cov duab paj rwb, lossis lwm cov khoom cog ntoo. Qhov kev xaiv ntawm cov hauv paus cellulose tuaj yeem cuam tshuam cov yam ntxwv ntawm cov khoom kawg cellulose ether cov khoom.

2. Pulping:

• Lub cellulose qhov chaw undergoes pulping kom tawg cov fibers rau hauv ib daim ntawv tswj xyuas ntxiv. Pulping tuaj yeem ua tiav los ntawm kev kho tshuab, tshuaj lom neeg, lossis kev sib txuas ntawm ob txoj kev.

3. Purification:

• Tus pulpped cellulose yog raug rau cov txheej txheem lim dej kom tshem tawm impurities, liignin, thiab lwm yam tsis yog-cellulosic cheeb tsam. Kev ua kom huv yog qhov tseem ceeb kom tau txais cov khoom siv cellulose zoo.

4. Kev ua kom lub cellulose:

• Lub cellulose huv tau qhib los ntawm kev o tuaj rau hauv kev daws teeb meem alkaline. Cov kauj ruam no yog qhov tseem ceeb heev rau kev ua lub cellulose ntau reactive thaum tom ntej muab tshuaj tiv thaiv etherification.

5. Kev Tiv Thaiv Kev Tiv Thaiv:

• Cov cellulose tshuab qhib erregoes etherification, uas muaj ether pawg tau qhia rau cov pawg hydroxyl ntawm lub cellulose saw. Common etherifying agents include ethylene oxide, propylene oxide, sodium chloroacetate, methyl chloride, and others.
• Cov tshuaj tiv thaiv yog ib txwm ua nyob rau hauv cov kev tswj ntawm qhov kub thiab kub, thiab pH kom ua tiav cov qib xav tau (DS) thiab zam kom tsis txhob muaj sab nrauv.

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 ntxuav kev ntxuav ua kom tshem tawm cov tshuaj thiab tsis zoo.

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 hom kev qhia tawm tsam, suav nrog kev sib nqus Nuclear sib nqus (NMR) spectroscopy, ftir) spectroscopy, thiab chromatography, thiab cov chromatography, tau ua haujlwm rau kev tswj hwm zoo. Cov DS yog cov tshuaj xyuas kom zoo sib xws.

9. Daim Qauv thiab Daim Ntawv Thov:

• 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 neeg hais txawv cellulose sib txawv tau haum rau kev lag luam sib txawv, xws li kev tsim kho, chaw muag tshuaj, khoom noj khoom haus, thiab lwm yam.

Nws yog ib qho tseem ceeb kom nco ntsoov tias cov hau kev tshwj xeeb thiab cov xwm txheej yuav txawv raws li cov khoom xav tau ether ether thiab cov ntawv thov. Cov neeg tsim khoom lag luam feem ntau ua haujlwm rau cov txheej txheem uas muaj kev cuam tshuam cellulose nrog cov khoom tshwj xeeb uas ua kom tau raws li qhov kev xav tau ntawm kev siv ntau yam kev lag luam.