Hydroxypropyl methylcellulose (INN aha: Hypromellose), dịkwa mfe dị ka hypromellose (hydroxypropyl methylcellulose, abbreviated dị ka HPMC), bụ ụdị 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:
Ngwaahịa a rụchara nke hydroxypropyl methylcellulose bụ ntụ ntụ ọcha ma ọ bụ na-acha ọcha fibrous siri ike, na nha nha ya na-agafe sieve 80-mesh.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, HPMC nwere ngwa na sịntetik resin polymerization, petrochemicals, ceramics, papermakers, akpụkpọ anụ, ntecha, mkpuchi, ihe ụlọ na photosensitive efere.
Oge nzipu: Mar-15-2023