I-Cellulose ether iyisigaba esibalulekile se-polymer compounds, esetshenziswa kabanzi ekwakhiweni, emithini, ekudleni nakweminye imikhakha. Phakathi kwazo, i-HPMC (i-hydroxypropyl methylcellulose), i-MC (methylcellulose), i-HEC (i-hydroxyethyl cellulose) ne-CMC (i-carboxymethyl cellulose) ama-ethers amane avamile we-cellulose.
I-Methyl cellulose (MC):
I-MC iyancibilika emanzini abandayo futhi kunzima ukuyincibilika emanzini ashisayo. Isixazululo esinamanzi sizinzile kakhulu ebangeni le-pH = 3 ~ 12, sinokuhambisana kahle, futhi singaxutshwa nezinhlobonhlobo zama-surfactants ezifana nesitashi ne-guar gum. Lapho izinga lokushisa lifinyelela izinga lokushisa le-gelation, i-gelation iyenzeka.
Ukugcinwa kwamanzi kwe-MC kuncike enanini layo elingeziwe, i-viscosity, ukucoleka kwezinhlayiyana nezinga lokuqedwa. Ngokuvamile, izinga lokugcinwa kwamanzi liphezulu uma inani elingeziwe likhulu, izinhlayiya zilungile futhi i-viscosity iphezulu. Phakathi kwazo, inani lokwengezwa linomthelela omkhulu kakhulu kuzinga lokugcinwa kwamanzi, futhi izinga le-viscosity alilingani nezinga lokugcinwa kwamanzi. Izinga lokuncibilika lincike kakhulu kwidigri yokuguqulwa komhlaba kanye nokucoleka kwezinhlayiyana zezinhlayiya ze-cellulose.
Ukushintsha kwezinga lokushisa kuzothinta kakhulu ukugcinwa kwamanzi kwe-MC. Ngokuvamile, lapho izinga lokushisa liphezulu, kuba kubi nakakhulu ukugcinwa kwamanzi. Uma izinga lokushisa lodaka lidlula i-40 ° C, ukugcinwa kwamanzi kwe-MC kuzoncishiswa kakhulu, kuthinte kakhulu ukusebenza kokwakhiwa kodaka.
I-MC inomthelela omkhulu ekusebenzeni kokwakhiwa kanye nokunamathela kodaka. Lapha, "ukunamathela" kubhekisela ekunamatheleni phakathi kwamathuluzi okwakha isisebenzi kanye ne-substrate yodonga, okungukuthi, ukumelana kwe-shear kodaka. Ukunamathela okukhulu, ukumelana okukhulu kwe-shear kodaka, amandla amakhulu adingwa isisebenzi ngesikhathi sokusetshenziswa, kanye nokusebenza kabi kokwakhiwa kodaka. Ukunamathela kwe-MC kusezingeni eliphakathi phakathi kwemikhiqizo ye-cellulose ether.
I-Hydroxypropyl methylcellulose (HPMC):
I-HPMC incibilika kalula emanzini, kodwa kungase kube nzima ukuyincibilikisa emanzini ashisayo. Kodwa-ke, izinga lokushisa layo le-gelation emanzini ashisayo liphakeme kakhulu kunalelo le-MC, futhi ukuncibilika kwayo emanzini abandayo nakho kungcono kune-MC.
I-viscosity ye-HPMC ihlobene nesisindo samangqamuzana, futhi i-viscosity iphezulu uma isisindo samangqamuzana sikhulu. Izinga lokushisa liphinde lithinte i-viscosity yayo, futhi i-viscosity iyancipha njengoba izinga lokushisa likhuphuka, kodwa izinga lokushisa lapho i-viscosity yayo iyancipha khona liphansi kunele-MC. Isixazululo saso sizinzile ekamelweni lokushisa.
Ukugcinwa kwamanzi kwe-HPMC kuncike enanini elingeziwe kanye ne-viscosity, njll. Izinga lokugcinwa kwamanzi ngenani elifanayo lokwengezwa lingaphezulu kwele-MC.
I-HPMC izinzile kuma-acids nama-alkali, futhi isixazululo sayo esinamanzi sizinze kakhulu ebangeni le-pH lika-2~12. I-Caustic soda namanzi e-lime anomthelela omncane ekusebenzeni kwawo, kodwa i-alkali ingasheshisa izinga lokuchithwa kwayo futhi ikhulise i-viscosity. I-HPMC izinzile kusawoti ojwayelekile, kepha lapho ukugcwala kwesixazululo sikasawoti kuphezulu, i-viscosity yesixazululo se-HPMC ivame ukwanda.
I-HPMC ingaxutshwa nezinhlanganisela ze-polymer ezincibilika emanzini ukuze zakhe umfaniswano, isisombululo se-viscosity esiphezulu, esifana ne-polyvinyl alcohol, isitashi ether, i-vegetable gum, njll.
I-HPMC inokumelana ne-enzayimu okungcono kune-MC, futhi isisombululo sayo asingenwa kalula ukonakala kwe-enzymatic kune-MC. I-HPMC inokunamathela kangcono kudaka kune-MC.
I-Hydroxyethyl cellulose (HEC):
I-HEC iyancibilika emanzini abandayo futhi kunzima ukuyincibilika emanzini ashisayo. Isixazululo sizinzile ekushiseni okuphezulu futhi asinazo izakhiwo zejeli. Ingasetshenziswa odakeni isikhathi eside ekushiseni okuphezulu, kodwa ukugcinwa kwayo kwamanzi kuphansi kune-MC.
I-HEC izinzile kuma-acids ajwayelekile nama-alkali, i-alkali ingasheshisa ukuqedwa kwayo futhi ikhulise kancane i-viscosity, futhi ukuhlakazeka kwayo emanzini kungaphansi kancane kune-MC ne-HPMC.
I-HEC inokusebenza okuhle kokumiswa kodaka, kodwa usimende unesikhathi eside sokuhlehla.
I-HEC ekhiqizwa amanye amabhizinisi asekhaya inokusebenza okuphansi kune-MC ngenxa yokuqukethwe kwayo okuphezulu kwamanzi kanye nomlotha.
I-Carboxymethyl cellulose (CMC):
I-CMC i-ionic cellulose ether elungiselelwe uchungechunge lwezindlela zokwelapha zokusabela ngemva kokuba imicu yemvelo (efana nokotini) ilashwe nge-alkali futhi i-chloroacetic acid isetshenziswa njenge-ejenti etherifying. Izinga lokushintsha ngokuvamile liphakathi kuka-0.4 no-1.4, futhi ukusebenza kwakho kuthintwa kakhulu izinga lokushintsha.
I-CMC inemiphumela yokuqina nokuqiniswa kwe-emulsification, futhi ingasetshenziswa eziphuzweni eziqukethe uwoyela namaprotheni ukuze idlale indima yokuqinisa i-emulsification.
I-CMC inomphumela wokugcina amanzi. Emikhiqizweni yenyama, isinkwa, amabhanisi aphekwe ngesitimu nokunye ukudla, kungabamba iqhaza ekuthuthukisweni kwezicubu, futhi kungenza amanzi angabi namandla, kwandise isivuno somkhiqizo, futhi kwandise ukunambitheka.
I-CMC inomphumela we-gelling futhi ingasetshenziswa ukwenza ijeli nojamu.
I-CMC ingakha ifilimu ebusweni bokudla, enomthelela othile wokuvikela ezithelweni nemifino futhi yandise impilo yeshalofu yezithelo nemifino.
Lawa ma-ether e-cellulose ngayinye inezindawo zayo eziyingqayizivele nezindawo zokusebenzisa. Ukukhethwa kwemikhiqizo efanelekile kudinga ukunqunywa ngokuya ngezidingo ezithile zohlelo kanye nezimo zemvelo.
Isikhathi sokuthumela: Oct-29-2024