IHydroxypropylmethylcellulose (HPMC) iphuma ku-cellulose esetshenziswa kabanzi ezimbonini ezahlukahlukene. Ukusetshenziswa okuyinhloko kwe-HPMC njengama-thieners, stabilizers nama-emulsifiers ezimbonini zokudla, ezemithi nezimonyo. I-HPMC iphinde isetshenziswe emkhakheni wezokwakha njengesengezo sikasimende, njengendawo yokumboza amaphilisi namaphilisi, nanjengesixazululo se-ophthalmic. Izinto zokusetshenziswa eziyinhloko ze-HPMC yi-cellulose nama-reagents amakhemikhali.
I-Cellulose:
I-Cellulose iyimpahla eyinhloko yokukhiqizwa kwe-HPMC. I-Cellulose iyi-polymer yemvelo etholakala ezindongeni zamaseli ezitshalo futhi iyi-polymer yemvelo eningi kakhulu eMhlabeni. Izakhiwo zamakhemikhali ze-cellulose zifana ne-HPMC, okwenza kube impahla eluhlaza efanelekile yokukhiqizwa kwe-HPMC. I-cellulose itholakala emithonjeni ehlukahlukene, kuhlanganise nokhuni, ukotini, nezitshalo ezihlukahlukene.
Umthombo ovame kakhulu we-cellulose osetshenziselwa ukukhiqizwa kwe-HPMC i-pulp yokhuni. I-Wood pulp itholakala ezinkuni ezithambile ezifana ne-spruce, i-pine ne-fir. I-Wood pulp iphathwa ngamakhemikhali ukuze iphule i-lignin ne-hemicellulose, ishiye i-cellulose ehlanzekile. I-cellulose ehlanzekile ibe i-bleached futhi igezwe ukuze kukhishwe noma yikuphi ukungcola.
I-Cellulose esetshenziselwa ukukhiqizwa kwe-HPMC kufanele ibe sezingeni eliphezulu futhi izinyathelo eziqinile zokulawula izinga kufanele zilandelwe ukuze kuqinisekiswe ukuhlanzeka kwe-cellulose. Ukuhlanzeka kwe-cellulose kubalulekile njengoba ukungcola kungathinta izakhiwo zomkhiqizo wokugcina.
Ama-reagents amakhemikhali:
Ukukhiqizwa kwe-HPMC kudinga ukusetshenziswa kwama-reagents amakhemikhali ahlukahlukene. Amakhemikhali asetshenziswa ekukhiqizeni i-HPMC ahlanganisa i-propylene oxide, i-methyl chloride, i-sodium hydroxide, i-hydrochloric acid, njll.
I-Propylene oxide isetshenziselwa ukukhiqiza i-hydroxypropyl cellulose (HPC), ebese isabela nge-methyl chloride ukukhiqiza i-HPMC. I-HPC ihlangana ne-methyl chloride ukuze imiselele amanye amaqembu e-hydroxyl ochungechungeni lwe-cellulose ngamaqembu e-methoxy ne-hydroxypropyl, ngaleyo ndlela yakhe i-HPMC.
I-sodium hydroxide isetshenziswa ekukhiqizeni i-HPMC ukuze kwandiswe inani le-pH lesixazululo sokuphendula ukusiza ukuncibilikisa i-cellulose.
Phakathi nenqubo yokukhiqiza ye-HPMC, i-hydrochloric acid isetshenziselwa ukulungisa inani le-pH lesisombululo sokusabela.
Ama-reagents amakhemikhali asetshenziswa ekukhiqizweni kwe-HPMC kufanele abe nobumsulwa obukhulu, futhi izimo zokusabela kufanele zilawulwe ngokucophelela ukuze kuqinisekiswe ikhwalithi yomkhiqizo wokugcina.
Ekuphetheni:
Izinto zokusetshenziswa eziyinhloko ze-HPMC yi-cellulose nama-reagents amakhemikhali. I-Cellulose, etholakala emithonjeni eyahlukene okuhlanganisa ukhuni, ukotini, nezitshalo ezihlukahlukene, iwumthombo oyinhloko wokukhiqizwa kwe-HPMC. Ama-chemical reagent asetshenziswa ekukhiqizweni kwe-HPMC afaka i-propylene oxide, i-methyl chloride, i-sodium hydroxide ne-hydrochloric acid. Ukukhiqizwa kwe-HPMC kudinga izinyathelo eziqinile zokulawula ikhwalithi ukuze kuqinisekiswe ukuhlanzeka kwezinto ezingavuthiwe kanye nekhwalithi yomkhiqizo wokugcina. I-HPMC isetshenziswa kabanzi ezimbonini ezahlukahlukene futhi inezinhlelo eziningi ezahlukahlukene ngenxa yezakhiwo zayo ezihlukile.
Isikhathi sokuthumela: Sep-06-2023