I-Hydroxypropylmethylcellulose (HPMC) iyi-derivative ye-cellulose evame ukusetshenziswa ezimbonini ezahlukahlukene, okuhlanganisa nemithi, ezokwakha kanye nokudla. I-viscosity yayo ingahluka kuye ngezici ezifana nesisindo sayo sama-molecule, izinga lokushintshaniswa, kanye nokuhlushwa kwesisombululo.
Isingeniso ku-Hydroxypropyl Methylcellulose (HPMC)
I-Hydroxypropyl methylcellulose iyi-polymer eyenziwe kancane etholakala ngokuguqulwa kwamakhemikhali kwe-cellulose. Ngenxa yezakhiwo zayo ezihlukile, isetshenziswa kabanzi njengesithambisi, i-gelling agent, i-film former kanye ne-stabilizer ezinhlotsheni ezahlukene zokusebenza.
Isakhiwo sama-molecule kanye nokwakheka kwawo
I-HPMC yakhiwe umgogodla we-cellulose one-hydroxypropyl kanye ne-methoxy substituents. Izinga lokushintshaniswa (DS) libhekisela enanini elimaphakathi le-substituents ngeyunithi ngayinye ye-anhydroglucose kuchungechunge lwe-cellulose. Inani elithile le-DS lithinta izakhiwo zomzimba nezamakhemikhali ze-HPMC.
Ukujiya kwe-HPMC
Ukuqina kuyipharamitha ebalulekile ye-HPMC, ikakhulukazi ezinhlelweni ezisebenzisa izakhiwo zayo zokujiya kanye nokwakheka kwejeli.
Ukuqina kwezixazululo ze-HPMC kuthinteka yizici eziningi:
1. Isisindo sama-molecule
Isisindo sama-molecule se-HPMC sithinta i-viscosity yayo. Ngokuvamile, ama-HPMC anesisindo sama-molecule aphezulu avame ukukhiqiza izixazululo ze-viscosity ephezulu. Kunezinhlobo ezahlukene ze-HPMC emakethe, ngayinye inobubanzi bayo obukhethekile besisindo sama-molecule.
2. Izinga lokushintshana (DS)
Amanani e-DS e-hydroxypropyl kanye namaqembu e-methoxy athinta ukuncibilika kanye nokuthamba kwe-HPMC. Amanani aphezulu e-DS ngokuvamile aholela ekuncibilikeni kwamanzi okwandisiwe kanye nezixazululo ezijiyile.
3. Ukugxila
Ukuhlushwa kwe-HPMC esixazululweni kuyisici esibalulekile esithinta ukuhlushwa. Njengoba ukuhlushwa kwanda, ukuhlushwa kuvame ukukhuphuka. Lobu budlelwano buvame ukuchazwa yi-equation kaKrieger-Dougherty.
4. Izinga lokushisa
Izinga lokushisa liphinde lithinte ukujiya kwezixazululo ze-HPMC. Ngokuvamile, ukujiya kwehla njengoba izinga lokushisa likhuphuka.
Izindawo zokufaka isicelo
Imithi: I-HPMC ivame ukusetshenziswa ekwakhiweni kwemithi, okuhlanganisa amaphilisi kanye nezixazululo zamehlo, lapho ukukhishwa okulawulwayo kanye nokuchacha kubalulekile khona.
Ukwakha: Embonini yokwakha, i-HPMC isetshenziswa njengesithako esiqinisayo emikhiqizweni esekelwe kusimende ukuthuthukisa ukusebenza kahle kanye nokugcinwa kwamanzi.
Imboni Yokudla: I-HPMC isetshenziswa njengesithambisi, isiqinisi kanye nesithambisi ekusetshenzisweni kokudla.
I-viscosity ye-hydroxypropyl methylcellulose iyisici esiyinkimbinkimbi esithinteka yizici eziningi ezifana nesisindo sama-molecule, izinga lokushintshana, ukuhlushwa kanye nokushisa. Amazinga ahlukene e-HPMC ayatholakala ukuze avumelane nezinhlelo zokusebenza ezithile, futhi abakhiqizi bahlinzeka ngamaphepha edatha yobuchwepheshe achaza ububanzi be-viscosity yesigaba ngasinye ngaphansi kwezimo ezahlukahlukene. Abacwaningi kanye nabakhiqizi kufanele bacabangele lezi zici ukuze bahlele izakhiwo ze-HPMC ukuze zihlangabezane nezidingo zezinhlelo zokusebenza ezihlosiwe.
Isikhathi sokuthunyelwe: Jan-20-2024