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Yiziphi izinkomba zobuchwepheshe eziyinhloko ze-hydroxypropyl methylcellulose (HPMC)?

IHydroxypropylmethylcellulose (HPMC) iyipolymer ethandwayo esetshenziswa ezimbonini ezifana nemithi, ezokwakha, ukudla nokunakekela komuntu siqu. Kuyindlela eguquliwe ye-cellulose etholwe ngokuphendula i-methylcellulose nge-propylene oxide. I-HPMC iyimpushana emhlophe noma emhlophe, engenaphunga, enganambitheki, encibilika kalula emanzini, i-ethanol nezinye izincibilikisi eziphilayo. Leli phepha lixoxa ngezinkomba zobuchwepheshe eziyinhloko ze-HPMC.

i-viscosity

I-Viscosity iyinkomba yezobuchwepheshe ebaluleke kakhulu ye-HPMC, enquma ukuziphatha kwayo nokusetshenziswa kwayo ezimbonini ezihlukahlukene. I-HPMC ine-viscosity ephezulu, okusho ukuthi inokuthungwa okuminyene, okufana noju. I-viscosity ye-HPMC ingalungiswa ngokushintsha izinga lokushintshwa kwamaqembu e-hydroxyl. Lapho izinga lokushintsha liphakeme, i-viscosity iyanda.

Izinga lokushintsha

I-degree of substitution (DS) ingenye inkomba yezobuchwepheshe ebalulekile ye-HPMC, ebhekisela enanini lamaqembu e-hydroxyl esikhundleni samaqembu e-hydroxypropyl namaqembu e-methyl. I-DS ye-HPMC ngokuvamile isukela ku-0.1 kuye ku-1.7, nge-DS ephakeme ebonisa ukuguqulwa okukhulu. I-DS ye-HPMC ithinta ukuncibilika kwayo, i-viscosity kanye nezakhiwo zejeli.

isisindo samangqamuzana

Isisindo samangqamuzana e-HPMC futhi siyinkomba yezobuchwepheshe ebalulekile ethinta izici zayo ezingokomzimba namakhemikhali njengokuncibilika, i-viscosity, kanye ne-gelation. I-HPMC ivamise ukuba nesisindo sengqamuzana esingu-10,000 kuya ku-1,000,000 wama-Daltons, anesisindo samangqamuzana aphezulu abonisa amaketanga amade e-polymer. Isisindo samangqamuzana e-HPMC sithinta ukusebenza kahle kwayo kokuqina, amandla okwenza ifilimu kanye namandla okubamba amanzi.

PH inani

Inani le-pH le-HPMC liyinkomba ebalulekile yezobuchwepheshe ethinta ukunyibilika kwayo kanye nokubonakala kwayo. I-HPMC iyancibilika ezixazululweni ezine-asidi ne-alkaline, kodwa i-viscosity yayo iphezulu ngaphansi kwezimo ezine-asidi. I-pH ye-HPMC ingalungiswa ngokungeza i-asidi noma isisekelo. I-HPMC ngokuvamile ine-pH ephakathi kuka-4 no-9.

umswakama

Umswakamo we-HPMC uyinkomba yezobuchwepheshe ebalulekile ethinta ukuzinza kwesitoreji nokusebenza kwayo. I-HPMC iyi-hygroscopic, okusho ukuthi imunca umswakama ovela emoyeni. Umswakama we-HPMC kufanele ugcinwe ungaphansi kuka-7% ukuze kuqinisekiswe ukuzinza kanye nekhwalithi yayo. Umswakama ophezulu ungaholela ekukhoneni kwe-polymer, i-clumping kanye nokuwohloka.

Okuqukethwe komlotha

Okuqukethwe komlotha we-HPMC kuyinkomba ebalulekile yezobuchwepheshe ethinta ubumsulwa nekhwalithi yayo. Umlotha ubhekisela ensaleni ye-inorganic esele ngemva kokushiswa kwe-HPMC. Okuqukethwe komlotha we-HPMC kufanele kube ngaphansi kuka-7% ukuze kuqinisekiswe ubumsulwa nekhwalithi yayo. Umlotha omningi ungase ubonise ukuba khona kokungcola noma ukungcola ku-polymer.

Izinga lokushisa le-Gelation

Izinga lokushisa lejeli le-HPMC liyinkomba ebalulekile yezobuchwepheshe ethinta ukusebenza kwayo kwejeli. I-HPMC ingangena ngaphansi kwezimo ezithile zokushisa nezimo zokuhlushwa. Izinga lokushisa le-gelation le-HPMC lingashintshwa ngokushintsha izinga lokushintshwa kanye nesisindo samangqamuzana. Izinga lokushisa le-gelling le-HPMC livamise ukuba ngu-50 kuya ku-90°C.

Ekuphetheni

IHydroxypropylmethylcellulose (HPMC) iyi-polymer esebenza ngezinto eziningi enezinhlobonhlobo zokucaciswa. Izinkomba zobuchwepheshe eziyinhloko ze-HPMC zifaka i-viscosity, izinga lokushintsha, isisindo samangqamuzana, inani le-pH, okuqukethwe komswakama, okuqukethwe komlotha, izinga lokushisa le-gelation, njll. Lezi zinkomba zobuchwepheshe zithinta izakhiwo ezingokwenyama namakhemikhali ze-HPMC futhi zinquma ukusebenza kwayo ezimbonini ezihlukahlukene. Ngokwazi lokhu kucaciswa, singakhetha uhlobo olulungile lwe-HPMC kuhlelo lwethu lokusebenza oluthile futhi siqinisekise ikhwalithi yayo nokuzinza.


Isikhathi sokuthumela: Sep-04-2023
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