Yuav ua li cas ua cellagulose ether?

Kev tsim cov cellulose hais txog kev kho mob celling make, feem ntau yog muab los ntawm ntoo pulp lossis paj rwb, los ntawm cov tshuaj lom neeg. Feem ntau hom cellulose muaj kev hais ua ke muaj xws li mehlulose cellulose (MC), Hydroxypropyl cellulose (HPMC), cellulropethyl cellulose (cmc), thiab lwm tus. Cov txheej txheem tseeb yuav sib txawv raws li cov cellulose tshwj xeeb ether tau tsim, tab sis cov theem dav dav zoo sib xws. Ntawm no yog qhov yooj yim conviewified:

Cov kauj ruam dav dav rau kev ua kom muaj kev muaj kev nyab xeeb cellulose:

1. Cellulose Source:

• Cov khoom pib yog cov cellulose ntuj, feem ntau tau los ntawm ntoo pulp lossis paj rwb. Lub cellulose feem ntau nyob rau hauv daim ntawv ntawm cellulose cellulose pulp.

2. Alkalization:

• Lub cellulose tau kho nrog kev daws teeb meem alkaline, xws li sodium hydroxide (Naoh), kom qhib cov pab pawg hydroxyl ntawm lub cellulose saw. Cov kauj ruam alkalization no yog qhov tseem ceeb rau kev derivatization ntxiv.

3. Ethetification:

• Lub cellulized alkalized yog raug etherification pab pawg ether cov ether kom tau qhia rau lub cellulose caj qaum. Cov pab pawg ether tshuaj tshwj xeeb (methyl, hydroxyethyl, hydroxyprropyl, etchopethyl, thiab lwm yam) nyob ntawm qhov xav tau cellulose ether.
• Tus txheej txheem etherification muaj cov tshuaj tiv thaiv ntawm cellulose nrog cov reagents uas tsim nyog, xws li:
  • Rau methyl cellulose (MC): Kev kho mob nrog Dimethyl sulfate lossis methyl chloride.
  • Rau hydroxyethyl cellulose (HEC): Kev kho nrog Ethylene oxide.
  • Rau hydroxypropyl methyl cellulose (HPMC): Kev kho nrog Propylene oxide thiab methyl chloride.
  • Rau cov carboxymethyl cellulose (CMC): Kev kho mob nrog sodium chloroacetate.

4. Neutralization thiab Ntxuav:

• Tom qab etherification, lub txiaj ntsig cellulose cellulose yog feem ntau yog nruab nrab kom tshem tawm cov alkali. Cov khoom yog tom qab ntawd ntxuav kom tshem tawm impurities thiab cov khoom lag luam.

5. Kom qhuav thiab milling:

• Lub cellulose ether yog qhuav kom tshem tawm cov dej noo ntau dhau thiab tom qab ntawd milled rau hauv cov hmoov zoo. Lub particle loj tuaj yeem tswj tau raws li cov ntawv thov.

6. Tswjhwm Zoo:

• Qhov kawg cellulose cov khoom lag luam intergoes undergoes zoo tswj hwm kev ntsuas kom ntseeg tau tias nws muaj cov ntsiab lus noo, thiab lwm yam muaj feem cuam tshuam.

Nws yog ib qho tseem ceeb kom nco ntsoov tias kev tsim cov cellulose muaj kev hais ua yog nqa los ntawm cov tuam txhab tsim nyog siv cov txheej txheem tsim nyog. Cov xwm txheej tshwj xeeb, reagents, thiab cuab yeej siv tuaj yeem sib txawv raws li cov khoom xav tau ntawm lub cellulose ether thiab cov ntawv thov. Ib qho ntxiv, kev ntsuas kev nyab xeeb yog qhov tseem ceeb thaum lub sijhawm ua haujlwm tshuaj lom neeg.