I-HPMC noma i-hydroxypropyl methylcellulose iyisithako esisebenziseka ngezindlela eziningi esisetshenziswa ezimbonini ezahlukahlukene okuhlanganisa nemithi, izimonyo kanye nokudla. Isetshenziswa kabanzi njengesithako esijiyisayo kanye ne-emulsifier, futhi i-viscosity yayo iyashintsha kuye ngokushisa evezwa kukho. Kulesi sihloko, sizogxila ebudlelwaneni obuphakathi kwe-viscosity kanye nokushisa ku-HPMC.
Ukuqina kuchazwa njengesilinganiso sokumelana koketshezi nokugeleza. I-HPMC iyinto eqinile kancane lapho ukulinganisa ukumelana kwayo kuncike ezintweni ezahlukahlukene, kufaka phakathi izinga lokushisa. Ukuze siqonde ubudlelwano phakathi kokuqina kanye nokushisa ku-HPMC, sidinga kuqala ukwazi ukuthi into yakhiwe kanjani nokuthi yenziwe ngani.
I-HPMC itholakala ku-cellulose, i-polymer eyenzeka ngokwemvelo ezitshalweni. Ukuze kukhiqizwe i-HPMC, i-cellulose idinga ukuguqulwa ngamakhemikhali nge-propylene oxide kanye ne-methyl chloride. Lokhu kuguqulwa kuphumela ekwakhekeni kwamaqembu e-hydroxypropyl kanye ne-methyl ether kuchungechunge lwe-cellulose. Umphumela uba yinto eqinile engancibilikiswa emanzini nasezincibilikisini eziphilayo futhi isetshenziswa ezinhlotsheni ezahlukahlukene, kufaka phakathi njengesembozo samaphilisi kanye ne-ejenti yokuqina kokudla, phakathi kwezinye.
Ukuqina kwe-HPMC kuncike ekuqineni kwento kanye nokushisa lapho ivezwa khona. Ngokuvamile, ukuqina kwe-HPMC kwehla ngokuqina okwandayo. Lokhu kusho ukuthi ukuqina okuphezulu kwe-HPMC kuholela ekuqineni okuphansi kanye nokuphikisana nalokho.
Kodwa-ke, ubudlelwano obuphambene phakathi kwe-viscosity kanye nokushisa buyinkimbinkimbi kakhulu. Njengoba kushiwo ngaphambili, i-viscosity ye-HPMC iyanda ngokuncipha kokushisa. Lokhu kusho ukuthi uma i-HPMC ingaphansi kokushisa okuphansi, ikhono layo lokugeleza liyancipha futhi iba yinkimbinkimbi kakhulu. Ngokufanayo, uma i-HPMC ingaphansi kokushisa okuphezulu, ikhono layo lokugeleza liyakhula futhi i-viscosity yayo iyancipha.
Kunezici ezahlukahlukene ezithinta ubudlelwano phakathi kokushisa kanye ne-viscosity ku-HPMC. Isibonelo, ezinye izinto ezincibilikayo ezikhona ku-liquid zingathinta i-viscosity, njengoba kunjalo ne-pH yoketshezi. Ngokuvamile, nokho, kukhona ubudlelwano obuphambene phakathi kwe-viscosity kanye ne-temperature ku-HPMC ngenxa yomphumela wokushisa ekubopheni kwe-hydrogen kanye nokusebenzisana kwama-molecule kwamaketanga e-cellulose ku-HPMC.
Uma i-HPMC ibhekene namazinga okushisa aphansi, amaketanga e-cellulose aba lukhuni kakhulu, okuholela ekwandeni kokubopha kwe-hydrogen. Lawa maketanga e-hydrogen abangela ukumelana kwento ukugeleza, ngaleyo ndlela kwandise ukuthamba kwayo. Ngokuphambene nalokho, lapho ama-HPMC ebhekene namazinga okushisa aphezulu, amaketanga e-cellulose aba nezimo eziguquguqukayo, okwaholela ekubangeni amaketanga e-hydrogen ambalwa. Lokhu kunciphisa ukumelana kwento ukugeleza, okuholela ekubangeni okuphansi kokuthamba.
Kuyafaneleka ukuqaphela ukuthi nakuba ngokuvamile kukhona ubudlelwano obuphambene phakathi kwe-viscosity kanye nokushisa kwe-HPMC, lokhu akwenzeki njalo kuzo zonke izinhlobo ze-HPMC. Ubudlelwano obuqondile phakathi kwe-viscosity kanye nokushisa bungahluka kuye ngenqubo yokukhiqiza kanye nezinga elithile le-HPMC elisetshenzisiwe.
I-HPMC iyisithako esisebenza ngezindlela eziningi esisetshenziswa kakhulu ezimbonini ezahlukahlukene ngenxa yezakhiwo zayo zokujiya kanye nokuxuba. Ukuqina kwe-HPMC kuncike ezintweni eziningana, okuhlanganisa ukujiya kwento kanye nokushisa lapho ivezwa khona. Ngokuvamile, ukuqina kwe-HPMC kuhambisana nokushisa, okusho ukuthi njengoba izinga lokushisa lehla, ukuqina kuyanda. Lokhu kungenxa yomphumela wokushisa ekubopheni kwe-hydrogen kanye nokusebenzisana kwama-molecule kwamaketanga e-cellulose ngaphakathi kwe-HPMC.
Isikhathi sokuthunyelwe: Septhemba-08-2023