Cov Txheej Txheem Tsim Khoom ntawm sodium carboxymethylcellulose

Cov txheej txheem tsim khoom ntawm sodium carboxymethylcellulose (CMC) muaj ntau kauj ruam, suav nrog kev npaj cov cellulose, etherification, purification, thiab ziab. Nov yog cov lus piav qhia txog cov txheej txheem tsim khoom ib txwm muaj:

1. Kev Npaj Cellulose: Cov txheej txheem pib nrog kev npaj cov cellulose, uas feem ntau yog los ntawm cov ntoo pulp lossis paj rwb linters. Cov cellulose yog thawj zaug purified thiab refined kom tshem tawm cov impurities xws li lignin, hemicellulose, thiab lwm yam impurities. Cov cellulose purified no ua haujlwm ua cov khoom siv pib rau kev tsim CMC.
2. Alkalization: Cov cellulose uas tau ntxuav lawm ces raug kho nrog cov kua alkaline, feem ntau yog sodium hydroxide (NaOH), kom nws cov tshuaj ua haujlwm ntau ntxiv thiab pab txhawb rau qhov kev sib xyaw ua ke tom qab. Alkalization kuj pab kom cov cellulose fibers o thiab qhib, ua rau lawv yooj yim dua rau kev hloov kho tshuaj.
3. Kev Sib Tov Etherification: Cov cellulose alkalized raug sib xyaw nrog monochloroacetic acid (MCA) lossis nws cov ntsev sodium, sodium monochloroacetate (SMCA), nyob rau hauv qhov muaj cov catalyst nyob rau hauv cov xwm txheej tswj hwm. Qhov kev sib xyaw etherification no cuam tshuam nrog kev hloov pauv ntawm cov pab pawg hydroxyl ntawm cov saw hlau cellulose nrog carboxymethyl (-CH2COONa) pawg. Qib ntawm kev hloov pauv (DS), uas sawv cev rau tus lej nruab nrab ntawm cov pab pawg carboxymethyl ib chav glucose ntawm cov saw hlau cellulose, tuaj yeem tswj tau los ntawm kev kho cov kev ntsuas kev sib xyaw xws li kub, lub sijhawm sib xyaw, thiab cov tshuaj reactant.
4. Kev Ua Kom Tsis Muaj Teeb Meem: Tom qab qhov kev sib xyaw ua ke ntawm etherification, cov khoom tsim tawm raug ua kom tsis muaj teeb meem los hloov cov pab pawg acidic uas tseem tshuav mus rau lawv cov ntsev sodium (carboxymethylcellulose sodium). Qhov no feem ntau ua tiav los ntawm kev ntxiv cov kua qaub alkaline, xws li sodium hydroxide (NaOH), rau hauv cov tshuaj sib xyaw. Kev ua kom tsis muaj teeb meem kuj pab kho qhov pH ntawm cov tshuaj thiab ua kom cov khoom CMC ruaj khov.
5. Kev Ua Kom Huv Si: Cov sodium carboxymethylcellulose nyoos ces raug ua kom huv si kom tshem tawm cov khoom tsis huv, cov tshuaj reagents tsis tau ua haujlwm, thiab cov khoom seem ntawm cov tshuaj sib xyaw. Cov txheej txheem ua kom huv si yuav suav nrog kev ntxuav, kev lim dej, centrifugation, thiab kev ziab. Cov CMC uas tau ua kom huv si feem ntau yog ntxuav nrog dej kom tshem tawm cov alkali thiab ntsev seem, ua raws li kev lim dej lossis centrifugation kom cais cov khoom CMC khov kho los ntawm cov kua theem.
6. Kev ziab: Cov sodium carboxymethylcellulose uas tau lim lawm thaum kawg yuav ziab kom tshem tawm cov dej noo ntau dhau thiab tau txais cov dej noo uas xav tau rau kev khaws cia thiab ua ntxiv. Cov txheej txheem ziab yuav suav nrog kev ziab cua, kev ziab tshuaj tsuag, lossis kev ziab nruas, nyob ntawm cov yam ntxwv ntawm cov khoom xav tau thiab qhov ntau thiab tsawg ntawm kev tsim khoom.

Cov khoom sodium carboxymethylcellulose uas tau los ntawm cov khoom no yog cov hmoov dawb mus rau dawb tawm los yog cov khoom siv granular uas muaj kev yaj dej zoo heev thiab cov khoom rheological. Nws yog siv dav ua tus neeg sawv cev thickening, stabilizer, binder, thiab rheology modifier hauv ntau yam lag luam, suav nrog zaub mov, tshuaj, tshuaj pleev ib ce, textiles, thiab kev siv hauv kev lag luam.