Cov txheej txheem rau kev tsim cov methyl cellulose ether

Kev tsim khoom ntawmMethyl Cellulose etherKoom nrog cov tshuaj hloov kho tshuaj lom neeg ntawm cellulose los ntawm etherification kev tiv thaiv. Methyl Cellulose (MC) yog cellulle dej-soluble cellulose siv dav hauv ntau yam kev lag luam. Ntawm no yog ib tug dav dav ntawm cov txheej txheem rau kev tsim cov methyl cellulose ether:

1. Xaiv cov cellulose los:

• Cov txheej txheem pib nrog kev xaiv ntawm lub cellulose los, feem ntau tau los ntawm ntoo pulp lossis paj rwb. Lub hauv paus cellulose yog xaiv raws li cov yam ntxwv uas xav tau ntawm cov tshuaj methyl kawg cellulose khoom.

2. Pulping:

• Cov cellulose xaiv tau undergoes pulping, tus txheej txheem uas tawg rau cov fibers rau hauv daim ntawv tswj xyuas ntxiv. Pulping tuaj yeem ua tiav los ntawm kev siv tshuaj kho mob lossis tshuaj lom neeg.

3. Kev ua kom lub cellulose:

• Cov pulpped cellulose yog tom qab ntawd qhib los ntawm kev kho nws nrog kev daws teeb meem alkaline. Cov kauj ruam no aims o kom o cellulose fibulose, ua rau lawv muaj ntau dua li thaum lub sij hawm tom ntej etherification cov tshuaj tiv thaiv.

4. Ethetification tiv thaiv:

• Cov ntaub ntawv ua kom tsis tiav nyob rau hauv etherification, uas yog cov pab pawg ethers, uas yog qhia rau cov pab pawg hydroxyl ntawm lub cellulose saw.
• Lub etherification cov tshuaj tiv thaiv cuam tshuam nrog kev siv methylating cov neeg sawv cev xws li sodium hydrocide thiab methyl chloride lossis Dimethyl sulfate. Cov tshuaj tiv thaiv, suav nrog qhov kub thiab txias, siab lub sijhawm thiab cov tshuaj tiv thaiv, ua tib zoo tswj kom tau cov qib xav tau (DS).

5. Neutralization thiab Ntxuav:

• Tom qab lub Ehereification cov tshuaj tiv thaiv, cov khoom yog neutralized kom tshem tawm ntau dhau alkali. Cov kauj ruam ntxuav kev ntxuav tawm tom ntej yog nqa tawm kom tshem tawm cov tshuaj uas tseem ceeb thiab tsis txaus ntseeg.

6. Kom Qhuav:

• Lub huv thiab methylated cellulose tau qhuav kom tau txais cov tshuaj me me Methyl cellulose ether cov khoom nyob rau hauv daim ntawv ntawm cov hmoov lossis granules.

7. Tswjhwm:

• 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 degree ntawm kev hloov pauv (DS) yog qhov ntsuas qhov tseem ceeb ntawm kev tsim khoom.

8. Cov qauv thiab ntim khoom:

• Lub methyl cellulose ether yog tom qab tsim los ua cov qhab nia sib txawv kom tau raws li cov kev cai tshwj xeeb ntawm ntau yam kev siv. Cov qhab nia sib txawv yuav txawv hauv lawv viscosity, me me, thiab lwm yam khoom.
• Cov khoom kawg yog ntim rau kev faib tawm.

Nws yog ib qho tseem ceeb kom nco ntsoov tias cov xwm txheej tshwj xeeb thiab cov tshuaj tiv thaiv uas tuaj yeem ua rau cov khoom lag luam ntawm cov tshuaj methyl ntawm lub methyl cellulose khoom. Methyl cellulose pom kev thov hauv kev lag luam khoom noj khoom haus, kev tsim kho, thiab lwm yam dej yog vim nws cov dej-solubility thiab ua yeeb yaj kiab ua ke.