Ukulungiswa kwe-Hydroxyethyl cellulose

I-Hydroxyethyl cellulose(HEC) i-polymer encibilika emanzini esetshenziswa kabanzi ezimbonini ezahlukahlukene njengezemithi, izimonyo, nokudla. I-HEC itholakala ku-cellulose, i-polymer yemvelo etholakala ezitshalweni, futhi iguqulwa ngamaqembu e-hydroxyethyl ukuze kuthuthukiswe ukunyibilika kwayo kwamanzi nezinye izakhiwo.

Ukucwengwa kwe-HEC kuhilela izinyathelo ezimbalwa zokuhlanza nokuguqula i-polymer ukuze ihlangabezane nezidingo ezithile zokusetshenziswa okuhlosiwe. Okulandelayo ezinye zezinyathelo ezijwayelekile ezibandakanyekayo ekucwengisisweni kwe-HEC:

1. Ukuhlanzwa: Isinyathelo sokuqala ekuthuthukisweni kwe-HEC ukuhlanzwa kwempahla eluhlaza ye-cellulose. Lokhu kuhilela ukususa ukungcola okufana ne-lignin, i-hemicellulose, nokunye ukungcola okungathinta ikhwalithi nezakhiwo zomkhiqizo wokugcina. Ukuhlanzwa kungafinyelelwa ngezindlela ezihlukahlukene ezifana nokugeza, ukuxubha, nokwelashwa kwe-enzymatic.

2. I-Alkalization: Ngemva kokuhlanzwa, i-cellulose iphathwa ngesisombululo se-alkali ukuze kwandiswe ukusebenza kabusha kwayo futhi kube lula ukwethulwa kwamaqembu e-hydroxyethyl. I-alkalization ivame ukwenziwa nge-sodium hydroxide noma i-potassium hydroxide emazingeni okushisa aphakeme nezingcindezi.

3. I-Etherification: Isinyathelo esilandelayo ukwethulwa kwamaqembu e-hydroxyethyl kumgogodla we-cellulose. Lokhu kwenziwa ngokusebenzisa i-etherification, ehlanganisa ukuphendula i-cellulose nge-ethylene oxide phambi kwe-catalyst ye-alkaline. Izinga le-etherification lingalawulwa ukuze kuzuzwe izici ezifiselekayo ezifana ne-viscosity, ukunyibilika, nokuzinza kwe-thermal.

4. I-Neutralization: Ngemva kokufakwa kwe-etherification, umkhiqizo uyekwa ukuze kukhishwe noma iyiphi i-alkali esele futhi kulungiswe i-pH ibe ibanga elifanelekile ukuze isetshenziswe okuhlosiwe. Ukungathathi hlangothi kungenziwa nge-asidi efana ne-acetic acid noma i-citric acid.

5. Ukuhlunga nokomisa: Isinyathelo sokugcina ukuhlunga nokomiswa komkhiqizo we-HEC ocolisisiwe. Umkhiqizo uvamise ukuhlungwa ukususa noma yikuphi ukungcola okusele bese womiswa kumswakama ofanelekile ukuze ugcinwe futhi uhanjiswe.

Sekukonke, ukucwengwa kwe-HEC kuhilela uchungechunge lwezinyathelo zokuhlanza nokuguqula impahla eluhlaza ye-cellulose ukuze kukhiqizwe i-polymer yekhwalithi ephezulu, encibilika emanzini enezici ezithile zokusetshenziswa kwayo okuhlosiwe.