Mokhoa oa tlhahiso ea sodium carboxymethylcellulose

Ts'ebetso ea tlhahiso ea sodium carboxymethylcellulose (CMC) e kenyelletsa mehato e mengata, ho kenyelletsa le ho lokisa selulose, etherification, tlhoekiso le ho omisa. Mona ke kakaretso ea ts'ebetso e tloaelehileng ea tlhahiso:

1. Tokisetso ea Cellulose: Ts'ebetso e qala ka ho lokisoa ha selulose, eo hangata e nkiloeng ho tloha makhasi a lehong kapa lithareng tsa k'hothone. Selulose e qala ho hloekisoa le ho hloekisoa ho tlosa litšila tse kang lignin, hemicellulose le litšila tse ling. Selulose ena e hloekisitsoeng e sebetsa e le lisebelisoa tsa ho qala tlhahiso ea CMC.
2. Alkalization: Selulose e hloekisitsoeng e ntan'o phekoloa ka tharollo ea alkaline, hangata sodium hydroxide (NaOH), ho eketsa ts'ebetso ea eona le ho thusa karabelo e latelang ea etherification. Alkalization e boetse e thusa ho ruruha le ho bula likhoele tsa selulose, ho etsa hore li fihlellehe habonolo ho feto-fetoha ha lik'hemik'hale.
3. Karabelo ya Etherification: Selulose e alkalized e arajoa ka monochloroacetic acid (MCA) kapa letsoai la eona la sodium, sodium monochloroacetate (SMCA), ka pel'a mokelikeli tlas'a maemo a laoloang. Karabelo ena ea etherification e kenyelletsa ho nkeloa sebaka ha lihlopha tsa hydroxyl liketane tsa cellulose ka lihlopha tsa carboxymethyl (-CH2COONA). The degree of substitution (DS), e emelang palo e tloaelehileng ea lihlopha tsa carboxymethyl ho yuniti ea tsoekere ea ketane ea selulose, e ka laoloa ka ho lokisa liparamente tsa karabelo joalo ka mocheso, nako ea karabelo, le likhakanyo tsa ho arabela.
4. Neutralization: Kamora karabelo ea etherification, sehlahisoa se hlahisoang ha se nke lehlakore ho fetolela lihlopha tse setseng tsa asiti ho sebopeho sa tsona sa letsoai la sodium (carboxymethylcellulose sodium). Sena se atisa ho finyelloa ka ho eketsa tharollo ea alkaline, e kang sodium hydroxide (NaOH), ho motsoako oa karabelo. Neutralization e boetse e thusa ho lokisa pH ea tharollo le ho tsitsisa sehlahisoa sa CMC.
5. Tlhoekiso: The crude sodium carboxymethylcellulose ebe e hloekisoa ho tlosa litšila, li-reagents tse sa sebetsaneng le lihlahisoa tse tsoang motsoakong oa karabelo. Mekhoa ea ho hloekisa e ka kenyelletsa ho hlatsoa, ​​ho sefa, ho kenya centrifugation le ho omisa. CMC e hloekisitsoeng e atisa ho hlatsuoa ka metsi ho tlosa alkali e setseng le matsoai, e lateloa ke filtration kapa centrifugation ho arola sehlahisoa se tiileng sa CMC ho tloha karolong ea mokelikeli.
6. Ho omisa: sodium carboxymethylcellulose e hloekisitsoeng e qetella e omisitsoe ho tlosa mongobo o feteletseng le ho fumana mongobo o lakatsehang bakeng sa polokelo le ts'ebetso e tsoelang pele. Mekhoa ea ho omisa e ka kenyelletsa ho omisa moea, ho omisa, kapa ho omisa meropa, ho ipapisitse le litšobotsi tse lakatsehang tsa sehlahisoa le sekala sa tlhahiso.

Sehlahisoa se hlahisoang ke sodium carboxymethylcellulose ke phofo e tšoeu ho isa ho e tšoeu kapa lisebelisoa tse granular tse nang le ts'ebetso e ntle ea ho qhibiliha ha metsi le thepa ea rheological. E sebelisoa haholo joalo ka ntho e matlafatsang, stabilizer, binder, le rheology modifier liindastering tse fapaneng, ho kenyeletsoa lijo, meriana, litlolo, masela le lisebelisoa tsa indasteri.