Hydroxypropyl methylcellulose (INN aha: Hypromellose), dịkwa mfe dị ka hypromellose (hydroxypropyl methylcellulose, abbreviated dị ka hypromellose).HPMC), bụ ihe dị iche iche nke nonionic cellulose agwakọta ethers. Ọ bụ ọkara sịntetik, anaghị arụ ọrụ, polymer viscoelastic nke a na-ejikarị dị ka mmanụ mmanu na ophthalmology, ma ọ bụ dị ka ihe mgbakwunye ma ọ bụ ihe mgbakwunye na ọgwụ ọnụ, a na-ahụkarị ya na ngwaahịa azụmahịa dị iche iche.
Dị ka ihe mgbakwunye nri, hypromellose nwere ike ịrụ ọrụ ndị a: emulsifier, thickener, onye nkwusioru na nnọchi nke gelatin anụmanụ. Koodu ya (E-koodu) na Codex Alimentarius bụ E464.
Njirimara kemịkalụ:
Emechara ngwaahịa nkehydroxypropyl methylcellulosebụ ọcha ntụ ntụ ma ọ bụ na-acha ọcha rụrụ fibrous siri ike, na urughuru nha na-agafe a 80-mesh sieve. Ọnụ ọgụgụ nke methoxyl na ọdịnaya hydroxypropyl nke ngwaahịa emechara dị iche, na viscosity dị iche iche, ya mere ọ na-aghọ ụdị dị iche iche na-arụ ọrụ dị iche iche. O nwere njiri mara nke ịdị na-agbaze na mmiri oyi na nke a na-apụghị ịsacha na mmiri ọkụ dị ka methyl cellulose, na solubility ya na ihe mgbaze organic karịrị nke mmiri. Enwere ike ịgbaze ya na methanol anhydrous na ethanol, a pụkwara ịgbaze ya na hydrocarbons chlorinated dị ka dichloro methane, trichloroethane, na ihe mgbaze organic dị ka acetone, isopropanol, na mmanya diacetone. Mgbe agbazere n'ime mmiri, ọ ga-ejikọta ya na ụmụ irighiri mmiri ka ọ bụrụ colloid. Ọ kwụsiri ike na acid na alkali, ọ naghị emetụta ya na pH = 2 ~ 12. Hypromellose, n'agbanyeghị na ọ naghị egbu egbu, na-ere ọkụ ma na-emeghachi omume n'ike na ihe ndị na-eme ihe na-ekpo ọkụ.
The viscosity nke HPMC ngwaahịa na-abawanye na-abawanye nke ịta na molekụla arọ, na mgbe okpomọkụ adahade, ya viscosity na-amalite ibelata. Mgbe ọ ruru ụfọdụ okpomọkụ, viscosity na-ebili na mberede na gelation pụtara. elu nke. Ngwọta mmiri ya na-akwụsi ike na ụlọ okpomọkụ, ma e wezụga na ọ nwere ike imebi ya site na enzymes, na viscosity ya n'ozuzu enweghị ihe mmebi. Ọ nwere ihe pụrụ iche thermal gelation Njirimara, ezigbo ihe nkiri na-emepụta ihe na ọrụ elu.
Na-eme:
Mgbe a gwọchara cellulose na alkali, alkoxy anion nke sitere na deprotonation nke ìgwè hydroxyl nwere ike ịgbakwunye propylene oxide iji mepụta hydroxypropyl cellulose ether; ọ nwekwara ike ịgbakọta na methyl chloride iji mepụta methyl cellulose ether. A na-emepụta Hydroxypropyl methylcellulose mgbe mmeghachi omume abụọ ahụ na-eme n'otu oge.
Iji:
Ojiji hydroxypropyl methylcellulose dị ka nke ethers cellulose ndị ọzọ. A na-ejikarị ya dị ka onye na-ekesa, onye na-akwụsịtụ akwụsị, thickener, emulsifier, stabilizer na nrapado dị iche iche na ubi. Ọ dị elu karịa ethers cellulose ndị ọzọ n'ihe gbasara solubility, dispersibility, nghọta na nguzogide enzyme.
N'ime nri na ụlọ ọrụ ọgwụ, a na-eji ya dị ka ihe mgbakwunye. A na-eji ya dị ka nrapado, thickener, dispersant, Emollient, stabilizer na emulsifier. Ọ nweghị nsí, ọ dịghị uru oriri na-edozi ahụ, ọ dịghịkwa mgbanwe metabolic.
Na mgbakwunye,HPMCnwere ngwa na sịntetik resin polymerization, petrochemicals, ceramics, papermakers, akpụkpọ anụ, ntecha, mkpuchi, ihe ụlọ na photosensitive efere.
Oge nzipu: Eprel-25-2024