IHydroxypropyl methylcellulose (igama le-INN: Hypromellose), ephinde yenziwe lula njenge-hypromellose (i-hydroxypropyl methylcellulose, efushanisiwe ngokuthiI-HPMC), izinhlobonhlobo ze-nonionic cellulose exubile ethers. Kuyi-semi-synthetic, engasebenzi, i-viscoelastic polymer evame ukusetshenziswa njengesithambisi ku-ophthalmology, noma njengesamukeli noma esisizayo emithini yokwenziwa kwemithi yomlomo, futhi ivame ukutholakala emikhiqizweni ehlukahlukene yokuthengisa.
Njengesengezo sokudla, i-hypromellose ingadlala izindima ezilandelayo: i-emulsifier, i-thickener, i-ejenti yokumisa futhi ibambele i-gelatin yezilwane. Ikhodi yayo (i-E-code) ku-Codex Alimentarius ithi E464.
Izakhiwo zamakhemikhali:
Umkhiqizo oqediwe wei-hydroxypropyl methylcelluloseiyimpushana emhlophe noma emhlophe eqinile eqinile ene-fibrous, futhi usayizi wezinhlayiyana udlula ngesisefo esinezikhala ezingama-80. Isilinganiso sokuqukethwe kwe-methoxyl kokuqukethwe kwe-hydroxypropyl yomkhiqizo oqediwe kuhlukile, futhi i-viscosity ihlukile, ngakho-ke iba yizinhlobonhlobo zezinhlobonhlobo ezinokusebenza okuhlukene. Inezici zokuncibilika emanzini abandayo futhi ayincibiliki emanzini ashisayo afana ne-methyl cellulose, futhi ukuncibilika kwayo kuzinyibilikisi zemvelo kudlula okwamanzi. Ingancibilika ku-anhydrous methanol kanye ne-ethanol, futhi ingancibilika kuma-hydrocarbon ane-chlorinated njenge-dichloro methane, i-trichloroethane, nezinyibilikisi eziphilayo njenge-acetone, isopropanol, ne-diacetone alcohol. Lapho incibilika emanzini, izohlangana nama-molecule amanzi ukuze yakhe i-colloid. Iqinile ku-asidi ne-alkali, futhi ayithinteki ebangeni le-pH=2~12. I-Hypromellose, nakuba ingenabo ubuthi, iyavutha futhi isabela ngobudlova nama-oxidizing agents.
I-viscosity yemikhiqizo ye-HPMC ikhula ngokwanda kokugxila kanye nesisindo samangqamuzana, futhi lapho izinga lokushisa likhuphuka, i-viscosity yayo iqala ukwehla. Lapho ifinyelela izinga lokushisa elithile, i-viscosity iphakama ngokuzumayo futhi i-gelation ivela. ukuphakama kwe. Isixazululo saso samanzi sizinzile ekamelweni lokushisa, ngaphandle kokuthi singonakaliswa ngama-enzyme, futhi i-viscosity yayo evamile ayinayo into yokuwohloka. Inezici ezikhethekile ze-thermal gelation, izakhiwo ezinhle zokwakha ifilimu kanye nomsebenzi ongaphezulu.
Ukwenza:
Ngemva kokuba i-cellulose iphathwe nge-alkali, i-alkoxy anion ekhiqizwa yi-deprotonation yeqembu le-hydroxyl ingangeza i-propylene oxide ukuze ikhiqize i-hydroxypropyl cellulose ether; ingaphinda ihlangane ne-methyl chloride ukuze ikhiqize i-methyl cellulose ether. IHydroxypropyl methylcellulose ikhiqizwa lapho ukusabela kokubili kwenziwa kanyekanye.
Ukusebenzisa:
Ukusetshenziswa kwe-hydroxypropyl methylcellulose kufana nokwamanye ama-cellulose ethers. Isetshenziswa kakhulu njenge-dispersant, i-ejenti yokumisa, i-thickener, i-emulsifier, i-stabilizer kanye ne-adhesive emikhakheni ehlukahlukene. Iphakeme kunamanye ama-cellulose ethers ngokuya nge-solubility, dispersibility, transparency and enzyme resistance.
Embonini yokudla neyokwenza imithi, isetshenziswa njengesengezo. Isetshenziswa njenge-adhesive, thickener, dispersant, Emollient, stabilizer kanye ne-emulsifier. Ayinabo ubuthi, ayinayo inani lokudla okunempilo, futhi ayinazo izinguquko ze-metabolic.
Ngaphezu kwalokho,I-HPMCinezinhlelo zokusebenza ku-synthetic resin polymerization, amakhemikhali e-petrochemicals, izitsha zobumba, ukwenza amaphepha, isikhumba, izimonyo, okokuhlanganisa, izinto zokwakha kanye namapuleti okuphrinta azwelayo.
Isikhathi sokuthumela: Apr-25-2024