Inkqubo yokuvelisa ye-sodium carboxymethylcellulose

Inkqubo yokwenziwa kwe-sodium carboxymethylcellulose (CMC) ibandakanya amanyathelo amaninzi, kubandakanywa ukulungiswa kweselulosi, i-etherification, ukuhlanjululwa, kunye nokomisa. Nantsi isishwankathelo senkqubo yokwenziwa kwemveliso:

1. Ukulungiswa kweCellulose: Inkqubo iqala ngokulungiswa kwe-cellulose, ngokuqhelekileyo ifunyenwe kwi-pulp yomthi okanye i-cotton linters. I-cellulose ihlanjululwa kuqala kwaye ihlanjululwe ukususa ukungcola okufana ne-lignin, i-hemicellulose, kunye nezinye izinto ezingcolileyo. Le cellulose esulungekileyo isebenza njengesixhobo sokuqala ukuveliswa kweCMC.
2. I-Alkalization: I-cellulose ecocekileyo iphathwa ngesisombululo se-alkaline, ngokuqhelekileyo i-sodium hydroxide (NaOH), ukwandisa ukusebenza kwayo kwakhona kwaye iququzelele ukusabela kwe-etherification elandelayo. I-alkalization iphinda incede ukudumba kunye nokuvula iifiber ze-cellulose, zibenze zifikeleleke ngakumbi ekuguqulweni kweekhemikhali.
3. I-Etherification Reaction: I-alkalized cellulose ithathwa kunye ne-monochloroacetic acid (MCA) okanye ityuwa yesodium, i-sodium monochloroacetate (SMCA), kubukho be-catalyst phantsi kweemeko ezilawulwayo. Le mpendulo ye-etherification ibandakanya ukutshintshwa kwamaqela e-hydroxyl kumakhonkco e-cellulose kunye namaqela e-carboxymethyl (-CH2COONA). I-degree of substitution (DS), emele i-avareji yenani lamaqela e-carboxymethyl kwiyunithi ye-glucose yekhonkco leselulosi, inokulawulwa ngokulungelelanisa iiparamitha zokusabela ezifana nobushushu, ixesha lokuphendula, kunye nokugxininiswa kwe-reactant.
4. I-Neutralization: Emva kokusabela kwe-etherification, imveliso ephumayo ingathathi hlangothi ukuguqula nawaphi na amaqela asele e-acidic kwifom yetyuwa yesodium (i-carboxymethylcellulose sodium). Oku ngokuqhelekileyo kuphunyezwa ngokudibanisa isisombululo se-alkaline, njenge-sodium hydroxide (NaOH), kumxube wokuphendula. I-Neutralization ikwanceda ukulungelelanisa i-pH yesisombululo kunye nokuzinzisa imveliso ye-CMC.
5. Ukuhlanjululwa: I-carboxymethylcellulose ekrwada ye-sodium ihlanjululwa ukuze isuse ukungcola, ii-reagents ezingaphendulwanga, kunye neemveliso ezivela kumxube wokuphendula. Iindlela zokucoca zingabandakanya ukuhlamba, ukuhluzwa, ukugxilwa kwe-centrifugation, kunye nokomisa. I-CMC ecociweyo idla ngokuhlanjwa ngamanzi ukuze isuse intsalela yealkali kunye neetyuwa, ilandelwa kukuhluzwa okanye i-centrifugation ukwahlula imveliso eqinileyo yeCMC kwinqanaba lolwelo.
6. Ukomisa: I-sodium carboxymethylcellulose ecociweyo yomiswa ekugqibeleni ukuze isuse ukufuma okugqithisileyo kwaye ifumane isiqulatho sokufuma esifunekayo ukuze sigcinwe kwaye siqhubeke nokusebenza. Iindlela zokomisa zingabandakanya ukomiswa komoya, ukomisa isitshizi, okanye ukomisa igubu, kuxhomekeke kwiimpawu zemveliso ezifunwayo kunye nesikali sokwenza.

Imveliso ye-sodium carboxymethylcellulose yimveliso emhlophe ukuya kumhlophe okanye i-granular material kunye ne-solubility egqwesileyo yamanzi kunye neempawu ze-rheological. Isetyenziswa ngokubanzi njengearhente yokutyebisa, ukuzinzisa, isibophelelo, kunye nesilungisi serheology kumashishini ahlukeneyo, kubandakanya ukutya, amayeza, izinto zokuthambisa, amalaphu, kunye nokusetyenziswa kwemizi-mveliso.