Ukuqina komphumela we-hydroxypropyl methylcellulose

IHydroxypropyl methylcelluloseI-HPMCifaka udaka olumanzi nge-viscosity enhle kakhulu, engakhuphula kakhulu ukunamathela phakathi kodaka olumanzi kanye nongqimba oluyisisekelo, futhi ithuthukise ukusebenza kodaka lokulwa nokusagiga. odakeni. Ukuqina komphumela we-cellulose ether nakho kungakhuphula i-homogeneity kanye nekhono lokulwa nokuhlakazeka kwezinto ezintsha ezisekelwe usimende, kuvimbele ukubola, ukuhlukaniswa kanye nokopha kodaka nokhonkolo, futhi kungasetshenziswa kukhonkolo oqiniswe ngefayibha, ukhonkolo ongaphansi kwamanzi nokuzihlanganisa. ukhonkolo .

I-Hydroxypropyl methylcellulose inyusa i-viscosity yezinto ezisekelwe kusimende kusukela ku-viscosity yesisombululo se-cellulose ether. I-viscosity yesisombululo se-cellulose ether ngokuvamile ihlolwe yinkomba ethi "viscosity". I-viscosity ye-cellulose ether ngokuvamile ibhekisela ekuhlanganiseni okuthile (okufana no-2%) wesisombululo se-cellulose ether ezingeni lokushisa elicacisiwe (elifana no-20°C) nokugunda Inani le-viscosity elilinganiswa ngethuluzi lokulinganisa elicacisiwe (njenge-viscometer ejikelezayo) ngaphansi kwesimo sejubane (noma izinga lokujikeleza, njenge-20 rpm).

I-Viscosity iyipharamitha ebalulekile yokuhlola ukusebenza kwe-cellulose ether. Ukuphakama kwe-viscosity yesisombululo se-hydroxypropyl methylcellulose, ngcono i-viscosity yezinto ezisekelwe kusimende, ngcono ukunamathela ku-substrate, ngcono ikhono lokulwa nokusaga kanye nokulwa nokuhlakazeka. Iqinile, kodwa uma i-viscosity yayo inkulu kakhulu, izophazamisa uketshezi nokusebenza kwezinto ezisekelwe kusimende (njengokunamathisela imimese yokunamathisela ngesikhathi sokwakha udaka). Ngakho-ke, i-viscosity ye-cellulose ether esetshenziswa odakeni oluxutshwe okomile ngokuvamile i-15,000 ~ 60,000 mPa. I-S-1, udaka oluzilinganisa kanye nokhonkolo ozihlanganisayo odinga uketshezi oluningi oludinga i-viscosity ephansi ye-cellulose ether.

Ngaphezu kwalokho, umphumela wokujiya we-hydroxypropyl methylcellulose wandisa isidingo samanzi sezinto ezisekelwe kusimende, ngaleyo ndlela andise isivuno sodaka.

I-viscosity yesisombululo se-hydroxypropyl methylcellulose incike kulezi zici ezilandelayo:

I-cellulose ether isisindo samangqamuzana (noma idigri ye-polymerization) nokugxila, izinga lokushisa lesixazululo, izinga lokugunda, nezindlela zokuhlola.

1. Izinga eliphakeme le-polymerization ye-cellulose ether, isisindo samangqamuzana sikhulu, kanye nokukhuphuka kwe-viscosity yesisombululo sayo esinamanzi;

2. Uma uphakeme umthamo (noma ukugxila) kwe-cellulose ether, kulapho i-viscosity yesisombululo sayo esinamanzi siphezulu, kodwa kufanele kuqashelwe ekukhetheni umthamo ofanele lapho usetshenziswa, ukuze ugweme umthamo oweqile futhi uthinte ukusebenza kodaka. kanye nokhonkolo;

3. Njengoketshezi oluningi, i-viscosity yesisombululo se-cellulose ether izokwehla ngokunyuka kwezinga lokushisa, futhi ukuphakama kwe-cellulose ether, umphumela wokushisa ube mkhulu;

4. Izixazululo ze-cellulose ether ngokuvamile ziyi-pseudoplastics enezici zokushefa. Ukuphakama kwesilinganiso sokugunda ngesikhathi sokuhlolwa, i-viscosity ephansi.

Ngakho-ke, ukuhlangana kodaka kuzoncishiswa ngenxa yesenzo samandla angaphandle, okuzuzisa ukwakhiwa kodaka, ukuze udaka lukwazi ukusebenza kahle nokuhlangana ngesikhathi esifanayo. Kodwa-ke, lapho ukuhlushwa kwesisombululo se-cellulose ether siphansi kakhulu futhi i-viscosity incane kakhulu, izobonisa izici ze-Newtonian fluid. Lapho ukugxila kukhula, isisombululo sizobonisa kancane kancane izici ze-pseudoplastic fluid, futhi lapho ukugxila kuphezulu, kusobala kakhulu i-pseudoplasticity.