Hydroxypropyl methylcellulose (aha INN: Hypromellulose), nke a na-akpọkwa hydroxypropyl methylcellulose (HPMC), bụ ụdị ethers ndị na-abụghị ionic cellulose agwakọtara.

Hydroxypropyl methylcellulose(Aha INN:Hypromellulose), a kpọkwara ya n'ime mkpụmkpụ dịkahydroxypropyl methylcellulose (HPMC), bụ ụdị ethers dị iche iche nke na-abụghị ionic cellulose agwakọtara. Ọ bụ polima viscoelastic nke a na-ejikarị eme ihe dị ka mmanụ na ọgwụgwọ anya, ma ọ bụ dị ka ihe mgbakwunye ma ọ bụ ihe na-enyere aka n'ọgwụ ọnụ, nke a na-ahụkarị n'ụdị ngwaahịa dị iche iche.

Dịka ihe mgbakwunye nri, hydroxypropyl methylcellulose nwere ike ịrụ ọrụ ndị a: emulsifier, thickener, suspension agent, na nnọchi maka gelatin anụmanụ. Koodu Codex Alimentarius ya bụ E464.

ihe onwunwe kemịkalụ

Ngwaahịa emechara nkehydroxypropyl methyl cellulosebụ ntụ ntụ ọcha ma ọ bụ ọcha siri ike nke nwere eriri siri ike, nke nha ihe na-agafe na sieve 80 mesh. Oke dị iche iche nke ọdịnaya methoxy na hydroxypropyl na viscosity nke ngwaahịa emechara na-eme ka ọ bụrụ ụdị dị iche iche nwere ọdịiche na arụmọrụ. O nwere njirimara nke ịbụ onye a na-agbaze na mmiri oyi na enweghị ike ịgbaze na mmiri ọkụ yiri methylcellulose, ike ya na ihe mgbaze organic karịrị nke mmiri. Ọ nwere ike ịgbaze na methanol na ethanol anhydrous, yana hydrocarbons chlorineated dị ka dichloromethane, trichloroethane, na ihe mgbaze organic dị ka acetone, isopropanol, na alcohol diacetone. Mgbe a gbazere ya na mmiri, ọ na-ejikọta ya na molekul mmiri iji mepụta colloid. Ọ kwụsiri ike na asịd na ntọala ma ọ dịghị emetụta ya n'ime oke pH nke 2-12. Ọ bụ ezie na hydroxypropyl methylcellulose anaghị egbu egbu, ọ na-ere ọkụ ma nwee ike imeghachi omume ike na oxidants [5].

Viskọst nkeNgwaahịa HPMCna-abawanye ka mmụba nke mkpokọta na ibu molekul na-abawanye. Mgbe okpomọkụ rịrị elu, viscosity na-amalite ịda. Mgbe okpomọkụ ruru okpomọkụ ụfọdụ, viscosity na-ebili na mberede wee mee gel. Okpomọkụ gel nke ngwaahịa viscosity dị ala dị elu karịa nke ngwaahịa viscosity dị elu. Mmiri mmiri ya na-adịgide adịgide na okpomọkụ ụlọ ma n'ozuzu ya enweghị mmebi nke viscosity ma e wezụga mmebi nke enzymatic. O nwere ihe pụrụ iche na-ekpo ọkụ, arụmọrụ dị mma nke na-akpụ ihe nkiri na ọrụ elu.

Nkwadebe

Mgbe ejiri alkali gwọọ cellulose, a pụrụ itinye anion alkoxy nke hydroxyl deprotonation mepụtara na epoxy propane iji mepụtahydroxypropyl cellulose ether; Ọ nwekwara ike ịgbakọta na methyl chloride iji mepụta methyl cellulose ether. Mgbe mmeghachi omume abụọ a na-eme n'otu oge,hydroxypropyl methyl cellulosea na-emepụta.

ebumnuche

Ojiji nkehydroxypropyl methyl cellulosedị ka nke ndị ọzọcellulose ethers, nke a na-ejikarị eme ihe dị ka ihe na-agbasa ihe, ihe na-eme ka ihe sie ike, ihe na-eme ka ihe sie ike, ihe na-eme ka ihe sie ike, ihe na-eme ka ihe sie ike, na ihe na-arapara n'ọtụtụ ebe. Ọ ka mma karịa ihe ndị ọzọ dị ka cellulose ethers ma a bịa n'ihe gbasara ịgbaze ihe, ịgbasa ihe, nghọta, na iguzogide enzyme.

N'ụlọ ọrụ nri na ọgwụ, a na-eji ya eme ihe dị ka ihe mgbakwunye. N'ihi ihe ndị na-arapara ya, ihe ndị na-eme ka ihe nkiri kpụọ, otú o si agbaze na otú o si gbasaa n'ime mmiri mmiri, nakwa ikike ya igbochi mmanụ ịbanye na mmiri ma nọgide na-enwe mmiri, a na-eji ya eme ihe dị ka ihe na-arapara, ihe na-eme ka ọ dị arọ, ihe na-eme ka ọ dị jụụ, ihe na-eme ka ọ kwụsie ike, na ihe na-eme ka ọ dị jụụ, na ihe na-eme ka ọ dị ka ihe na-eme ka ọ dị nro, na ihe na-eme ka ọ dị nro, ọ dịghịkwa agbanwe agbanwe n'ime ahụ.

Na mgbakwunye,HPMCnwere ngwa na mmeghachi omume polymerization nke resin sịntetik, petrochemicals, seramiiki, imepụta akwụkwọ, akpụkpọ anụ, ihe ịchọ mma, mkpuchi, ihe owuwu ụlọ, na efere mbipụta fotosensitive.