I-Hydroxypropyl methylcellulose(Igama le-INN:I-Hypromellulose), futhi kufinyezwe ngokuthii-hydroxypropyl methylcellulose (I-HPMC), iyinhlobonhlobo yama-ether axubile e-cellulose angewona i-ionic. Iyi-polymer eyi-semi synthetic, engasebenzi, ene-viscoelastic evame ukusetshenziswa njenge-lubricant ku-ophthalmology, noma njengesithasiselo noma isithako ekwelapheni ngomlomo, evame ukutholakala ezinhlotsheni ezahlukene zezimpahla.
Njengesengezo sokudla, i-hydroxypropyl methylcellulose ingadlala izindima ezilandelayo: i-emulsifier, i-thickener, i-suspension agent, kanye ne-gelatin yezilwane esikhundleni sayo. Ikhodi yayo ye-Codex Alimentarius ingu-E464.
impahla yamakhemikhali
Umkhiqizo oqediwe wei-hydroxypropyl methyl celluloseiyimpuphu emhlophe noma i-white loose fibrous solid, enobukhulu bezinhlayiya ezidlula ngesihlungo sama-mesh angu-80. Izilinganiso ezahlukene zokuqukethwe kwe-methoxy ne-hydroxypropyl kanye ne-viscosity yomkhiqizo oqediwe kuyenza ibe nezinhlobo ezahlukahlukene ezinokwehluka kokusebenza. Inezici zokuthi incibilike emanzini abandayo futhi ayincibiliki emanzini ashisayo njenge-methylcellulose, futhi ukuncibilika kwayo ezincibilikisini zezinto eziphilayo kudlula okwamanzi. Ingancibilika ku-methanol ne-ethanol engamanzi, kanye nama-hydrocarbon ane-chlorine njenge-dichloromethane, i-trichloroethane, kanye nezincibilikisini zezinto eziphilayo njenge-acetone, i-isopropanol, kanye ne-diacetone alcohol. Uma incibilika emanzini, ihlangana nama-molecule amanzi ukuze yakhe i-colloid. Izinzile kuma-acid kanye nezisekelo futhi ayithinteki ngaphakathi kobubanzi be-pH obungu-2-12. Nakuba i-hydroxypropyl methylcellulose ingeyona ubuthi, iyavutha futhi ingasabela ngamandla ngama-oxidants [5].
Ukuthamba kwe-Imikhiqizo ye-HPMCiyanda ngokwanda kokuhlushwa kanye nesisindo sama-molecule. Lapho izinga lokushisa likhuphuka, i-viscosity iqala ukwehla. Lapho izinga lokushisa lifinyelela izinga lokushisa elithile, i-viscosity ikhuphuka ngokuzumayo bese kuvela i-gel. Izinga lokushisa le-gel lemikhiqizo ye-viscosity ephansi liphakeme kunelemikhiqizo ye-viscosity ephezulu. Isixazululo sayo samanzi sizinzile ekushiseni kwegumbi futhi ngokuvamile asinawo ukwehla kwe-viscosity ngaphandle kokuwohloka kwe-enzyme. Inezakhiwo ezikhethekile ze-gelling ezishisayo, ukusebenza okuhle kokwakheka kwefilimu kanye nomsebenzi womphezulu.
Ukulungiselela
Ngemva kokuba i-cellulose iphathwe nge-alkali, i-alkoxy anion ekhiqizwa yi-hydroxyl deprotonation ingafakwa ku-epoxy propane ukuze ikhiqizei-hydroxypropyl cellulose etherIngaphinde ihlangane ne-methyl chloride ukuze ikhiqize i-methyl cellulose ether. Uma zombili lezi zindlela zenzeka ngesikhathi esisodwa,i-hydroxypropyl methyl cellulosekukhiqizwa.
inhloso
Ukusetshenziswa kwei-hydroxypropyl methyl cellulosekufana nezinyeama-ether e-cellulose, esetshenziswa kakhulu njenge-dispersant, i-suspension agent, i-thickener, i-emulsifier, i-stabilizer, kanye ne-adhesive emikhakheni eyahlukahlukene. Ingcono kunezinye i-cellulose ethers ngokuya ngokuncibilika, ukuhlakazeka, ukucaca, kanye nokumelana nama-enzyme.
Embonini yokudla neyokwelapha, isetshenziswa njengesithasiselo. Ngenxa yezakhiwo zayo zokunamathela, izakhiwo zokwakha ifilimu, ukuqina nokusabalala koketshezi, kanye nekhono layo lokuvimbela ukungena kwamafutha nokugcina umswakama, isetshenziswa njenge-glue, i-thickener, i-dispersant, i-reliever, i-stabilizer, kanye ne-emulsifier. Ayinawo ubuthi, ayinawo umsoco, futhi ayinazo izinguquko ze-metabolic.
Ngaphezu kwalokho,I-HPMCinezinhlelo zokusebenza ekuphenduleni kwe-polymerization ye-resin yokwenziwa, amakhemikhali e-petrochemicals, izinto zobumba, ukwenza iphepha, isikhumba, izimonyo, ukumbozwa, izinto zokwakha, kanye namapuleti okunyathelisa azwela ukukhanya.
Isikhathi sokuthunyelwe: Septhemba-04-2023