I-Cellulose ether iyinhlanganisela ye-polymer eyenziwe nge-cellulose yemvelo ngenqubo ye-etherification, futhi iyisithako esihle kakhulu sokuqinisa nokugcina amanzi.
Isizinda Socwaningo
Ama-cellulose ethers asetshenziswe kabanzi ku-dry-mixed mortar eminyakeni yamuva nje, asetshenziswa kakhulu amanye ama-non-ionic cellulose ethers, okuhlanganisa i-methyl cellulose ether (MC), i-hydroxyethyl cellulose ether (HEC), i-hydroxyethyl cellulose ether i-Methyl cellulose ether (HEMC) kanye ne-hydroxypropyl methyl cellulose ether (HPMC). Njengamanje, azikho izincwadi eziningi ngendlela yokulinganisa i-viscosity yesisombululo se-cellulose ether. Ezweni lakithi, amazinga athile kanye nama-monograph kuphela achaza indlela yokuhlola i-viscosity yesisombululo se-cellulose ether.
Indlela yokulungiselela isixazululo se-cellulose ether
Ukulungiswa kwesisombululo se-Methyl Cellulose Ether
Ama-ether e-Methyl cellulose abhekisela kuma-ether e-cellulose aqukethe amaqembu e-methyl ku-molecule, njenge-MC, i-HEMC kanye ne-HPMC. Ngenxa yokungangeni kwamanzi kweqembu le-methyl, izixazululo ze-ether ze-cellulose eziqukethe amaqembu e-methyl zinezakhiwo ze-gelation ezishisayo, okungukuthi, azincibiliki emanzini ashisayo ekushiseni okuphezulu kunezinga lokushisa lazo le-gelation (cishe ngo-60-80°C). Ukuze uvimbele isixazululo se-ether se-cellulose ekwakheni ama-agglomerate, fudumeza amanzi ngaphezu kwezinga lokushisa le-gel, cishe ngo-80~90°C, bese ufaka i-powder ye-ether ye-cellulose emanzini ashisayo, uvuselele ukuze uhlakazeke, qhubeka uvuselela futhi uphole. Kuze kube yilapho izinga lokushisa elibekiwe, lingalungiswa libe yisisombululo se-ether se-cellulose esifanayo.
Izakhiwo zokuncibilika kwama-ether aqukethe i-methylcellulose angaphathwanga phezulu
Ukuze kugwenywe ukuhlangana kwe-cellulose ether ngesikhathi senqubo yokuncibilika, abakhiqizi ngezinye izikhathi benza ukwelashwa kwamakhemikhali ebusweni bemikhiqizo ye-cellulose ether eyimpuphu ukuze kulibazise ukuncibilika. Inqubo yokuncibilika kwayo yenzeka ngemva kokuba i-cellulose ether isihlakazeke ngokuphelele, ngakho-ke ingahlakazwa ngqo emanzini abandayo ngenani le-pH elingathathi hlangothi ngaphandle kokwakha ama-agglomerate. Uma inani le-pH lesisombululo liphakeme, isikhathi sokuncibilika se-cellulose ether esinezakhiwo zokuncibilika ezibambezelekile siba sifushane. Lungisa inani le-pH lesisombululo libe nenani eliphakeme. I-Alkalinity izosusa ukuncibilika okubambezelekile kwe-cellulose ether, okubangela ukuthi i-cellulose ether yakhe ama-agglomerate lapho incibilika. Ngakho-ke, inani le-pH lesisombululo kufanele liphakanyiswe noma lehliswe ngemva kokuba i-cellulose ether isihlakazeke ngokuphelele.
Izakhiwo zokuncibilika kwama-ether aqukethe i-methylcellulose aphathwe phezulu
Ukulungiswa kwesisombululo se-Hydroxyethyl Cellulose Ether
Isixazululo se-Hydroxyethyl cellulose ether (HEC) asinayo impahla ye-helation yokushisa, ngakho-ke, i-HEC ngaphandle kokwelashwa kwendawo nayo izokwakha ama-agglomerate emanzini ashisayo. Abakhiqizi ngokuvamile benza ukwelashwa kwendawo yamakhemikhali ku-HEC eyimpuphu ukuze babambezele ukuncibilika, ukuze ihlakazeke ngqo emanzini abandayo ngenani le-pH elingathathi hlangothi ngaphandle kokwakha ama-agglomerate. Ngokufanayo, esixazululweni esine-alkalinity ephezulu, i-HEC Ingakha nama-agglomerate ngenxa yokulahlekelwa kokuncibilika okulibazisekile. Njengoba i-slurry yesimende iyi-alkaline ngemva kokumanzisa amanzi futhi inani le-pH lesisombululo liphakathi kuka-12 no-13, izinga lokuncibilika kwe-ether ye-cellulose ephathwe indawo ku-slurry yesimende nalo lishesha kakhulu.
Izakhiwo zokuncibilika kwe-HEC ephathwe ubuso
Isiphetho Nokuhlaziywa
1. Inqubo yokuhlakazeka
Ukuze kugwenywe imiphumela emibi ngesikhathi sokuhlolwa ngenxa yokuncibilika kancane kwezinto zokwelapha ubuso, kunconywa ukusebenzisa amanzi ashisayo ukulungiselela.
2. Inqubo yokupholisa
Izixazululo ze-cellulose ether kufanele zivuselelwe futhi zipholiswe ekushiseni okujwayelekile ukuze kuncishiswe izinga lokupholisa, okudinga izikhathi zokuhlola ezengeziwe.
3. Inqubo yokuxuba
Ngemva kokuba i-cellulose ether ingeziwe emanzini ashisayo, qiniseka ukuthi uyaqhubeka nokuxuba. Lapho izinga lokushisa lamanzi lehla ngaphansi kwezinga lokushisa lejeli, i-cellulose ether izoqala ukuncibilika, futhi isixazululo sizoba bushelelezi kancane kancane. Ngalesi sikhathi, ijubane lokuxuba kufanele lehliswe. Ngemva kokuba isixazululo sifinyelele ku-viscosity ethile, sidinga ukuma isikhathi esingaphezu kwamahora ayi-10 ngaphambi kokuba amabhamuza antante kancane phezulu ukuze aqhume futhi anyamalale.
Amabhamuza Omoya ku-Cellulose Ether Solution
4. Inqubo yokufumisa amanzi
Ikhwalithi ye-cellulose ether namanzi kufanele ikalwe ngokunembile, futhi ungalindi ukuthi ikhambi lifinyelele i-viscosity ephezulu ngaphambi kokugcwalisa amanzi.
5. Ukuhlolwa kokuqina
Ngenxa ye-thixotropy yesisombululo se-cellulose ether, lapho kuhlolwa i-viscopy yayo, lapho i-rotor ye-viscometer ejikelezayo ifakwa esixazululweni, izophazamisa isixazululo futhi ithinte imiphumela yokulinganisa. Ngakho-ke, ngemva kokuba i-rotor ifakwe esixazululweni, kufanele ivunyelwe ukuthi ime imizuzu emi-5 ngaphambi kokuhlolwa.
Isikhathi sokuthunyelwe: Mashi-22-2023