Ho lokisoa ha cellulose ethers

Tokisetso eali-cellulose etherse kenyelletsa ho fetola ka lik'hemik'hale selulose ea tlhaho ea polymer ka karabelo ea etherification. Ts'ebetso ena e kenyelletsa lihlopha tsa ether ho lihlopha tsa hydroxyl tsa ketane ea cellulose polymer, e lebisang ho thehoeng ha cellulose ethers tse nang le thepa e ikhethang. Li-cellulose ethers tse tloaelehileng haholo li kenyelletsa Hydroxypropyl Methylcellulose (HPMC), Carboxymethyl Cellulose (CMC), Hydroxyethyl Cellulose (HEC), Methyl Cellulose (MC), le Ethyl Cellulose (EC). Mona ke kakaretso ea kakaretso ea tšebetso ea ho lokisa:

1. Ho Fumana Cellulose:

• Ts'ebetso e qala ka ho fumana selulose, eo hangata e nkiloeng ho makhasi a lehong kapa k'hothone. Khetho ea mohloli oa cellulose e ka susumetsa thepa ea sehlahisoa sa ho qetela sa cellulose ether.

2. Pulping:

• Selulose e tlas'a ts'ebetso ea pulping ho senya likhoele ka mokhoa o laolehang haholoanyane. Sena se ka kenyelletsa mekhoa ea mochini kapa ea lik'hemik'hale.

3. Tlhoekiso:

• Selulose e hloekisoa ho tlosa litšila, lignin le likarolo tse ling tse se nang cellulosic. Mohato ona oa tlhoekiso o bohlokoa bakeng sa ho fumana thepa ea boleng bo holimo ea cellulose.

4. Karabelo ea Etherification:

• Selulose e hloekisitsoeng e kena etherification, moo lihlopha tsa ether li hlahisoang ho lihlopha tsa hydroxyl ka ketane ea cellulose polymer. Khetho ea moemeli oa etherifying le maemo a karabelo a ipapisitse le sehlahisoa se lakatsehang sa cellulose ether.
• Lisebelisoa tse tloaelehileng tsa etherifying li kenyelletsa ethylene oxide, propylene oxide, sodium chloroacetate, methyl chloride, le tse ling.

5. Taolo ea li-Parameters tsa Reaction:

• Boitšoaro ba etherification bo laoloa ka hloko ho latela mocheso, khatello, le pH ho fihlela tekanyo e lakatsehang ea ho fetola (DS) le ho qoba maikutlo a mahlakoreng.
• Hangata maemo a alkaline a sebelisoa, 'me pH ea motsoako oa karabelo e behiloe leihlo ka hloko.

6. Ho Neutralization le Ho Hlatsoa:

• Ka mor'a karabelo ea etherification, sehlahisoa hangata ha se nke lehlakore ho tlosa li-reagents tse feteletseng kapa lihlahisoa. Mohato ona o lateloa ke ho hlatsoa ka ho feletseng ho felisa lik'hemik'hale tse setseng le litšila.

7. Ho omisa:

• Selulose e hloekisitsoeng le e etherified e omisitsoe ho fumana sehlahisoa sa ho qetela sa cellulose ether ka phofo kapa sebōpeho sa granular.

8. Taolo ea Boleng:

• Ho sebelisoa mekhoa e fapaneng ea tlhahlobo bakeng sa taolo ea boleng, ho kenyeletsoa spectroscopy ea nuclear magnetic resonance (NMR), Fourier-transform infrared (FTIR) spectroscopy, le chromatography.
• The degree of substitution (DS) ke parameter ea bohlokoa e shejoang nakong ea tlhahiso ho netefatsa botsitso.

9. Tlhahiso le Pakete:

• Joale cellulose ether e etsoa ka limaraka tse fapaneng ho fihlela litlhoko tse khethehileng tsa lits'ebetso tse fapaneng. Lihlahisoa tsa ho qetela li phuthetsoe hore li ajoe.

Ho lokisoa ha cellulose ethers ke ts'ebetso e rarahaneng ea lik'hemik'hale e hlokang taolo e hlokolosi ea maemo a karabelo ho fihlela thepa e lakatsehang. Ho feto-fetoha ha li-cellulose ethers ho lumella hore li sebelisoe mefuteng e mengata ea lisebelisoa ho pholletsa le indasteri, ho kenyelletsa le meriana, lijo, kaho, liphahlo le tse ling.