Ukulungiswa kwe-cellulose ethers

Ukulungiswa kwei-cellulose etherskubandakanya ukuguqula ngamakhemikhali i-polymer cellulose yemvelo ngokusabela kwe-etherification. Le nqubo yethula amaqembu e-ether emaqenjini e-hydroxyl eketango le-cellulose polymer, okuholela ekwakhekeni kwama-cellulose ether anezakhiwo ezihlukile. Ama-cellulose ether ajwayeleke kakhulu ahlanganisa i-Hydroxypropyl Methylcellulose (HPMC), Carboxymethyl Cellulose (CMC), Hydroxyethyl Cellulose (HEC), Methyl Cellulose (MC), kanye ne-Ethyl Cellulose (EC). Nakhu ukubuka konke okujwayelekile kwenqubo yokulungiselela:

1. Ukuthola iCellulose:

• Inqubo iqala ngokuthola i-cellulose, evame ukutholakala ku-pulp yokhuni noma ukotini. Ukukhethwa komthombo we-cellulose kungaba nomthelela ezinhlelweni zomkhiqizo wokugcina we-cellulose ether.

2. Ukudonsa:

• I-cellulose ingaphansi kwezinqubo ze-pulping ukuze iphule imicu ibe yindlela elawulekayo. Lokhu kungase kuhlanganise izindlela zokudonsa ngomshini noma ngamakhemikhali.

3. Ukuhlanzwa:

• I-cellulose iyahlanzwa ukuze isuse ukungcola, i-lignin, nezinye izakhi ezingezona i-cellulosic. Lesi sinyathelo sokuhlanza sibalulekile ekutholeni impahla ye-cellulose yekhwalithi ephezulu.

4. Ukusabela kwe-Etherification:

• I-cellulose ehlanzekile idlula i-etherification, lapho amaqembu e-ether ethulwa emaqenjini e-hydroxyl kuketango le-cellulose polymer. Ukukhethwa kwe-etherifying agent kanye nezimo zokusabela kuncike emkhiqizweni we-cellulose ether oyifunayo.
• Ama-etherifying agents avamile ahlanganisa i-ethylene oxide, i-propylene oxide, i-sodium chloroacetate, i-methyl chloride, nabanye.

5. Ukulawulwa Kwezinhlaka Zokusabela:

• Ukusabela kwe-etherification kulawulwa ngokucophelela ngokwezinga lokushisa, ingcindezi, kanye ne-pH ukuze kuzuzwe izinga elifiswayo lokushintshwa (DS) futhi kugwenywe ukusabela okuseceleni.
• Izimo ze-alkaline zivame ukusetshenziswa, futhi i-pH yengxube yokusabela iqashwe ngokucophelela.

6. Ukungathathi hlangothi kanye Nokugeza:

• Ngemuva kokusabela kwe-etherification, umkhiqizo uvamise ukuncishiswa ukuze kukhishwe ama-reagents amaningi noma imikhiqizo. Lesi sinyathelo silandelwa ukugeza ngokuphelele ukuze kuqedwe amakhemikhali ayinsalela nokungcola.

7. Ukomisa:

• I-cellulose ehlanziwe ne-etherified yomiswa ukuze kutholwe umkhiqizo wokugcina we-cellulose ether uyimpushana noma ifomu le-granular.

8. Ukulawulwa Kwekhwalithi:

• Kusetshenziswa amasu okuhlaziya ahlukahlukene ekulawuleni ikhwalithi, okuhlanganisa i-spectroscopy ye-nuclear magnetic resonance (NMR), i-Fourier-transform infrared infrared (FTIR) spectroscopy, kanye ne-chromatography.
• I-degree of substitution (DS) iyipharamitha ebalulekile eqashwe ngesikhathi sokukhiqiza ukuze kuqinisekiswe ukuvumelana.

9. Ukwakhiwa kanye Nokupakishwa:

• I-cellulose ether ibe isilungiswa ibe amabanga ahlukene ukuze ihlangabezane nezimfuneko ezithile zezinhlelo zokusebenza ezihlukahlukene. Imikhiqizo yokugcina iyapakishwa ukuze isatshalaliswe.

Ukulungiswa kwama-cellulose ethers kuyinqubo yamakhemikhali eyinkimbinkimbi edinga ukulawulwa ngokucophelela kwezimo zokusabela ukuze kuzuzwe izakhiwo ezidingekayo. Ukuguquguquka kwe-cellulose ethers kuvumela ukusetshenziswa kwawo ezinhlobonhlobo zezinhlelo zokusebenza kuzo zonke izimboni, okuhlanganisa ezemithi, ukudla, ukwakhiwa, ama-coatings, nokuningi.