Hydroxypropyl methyl cellulose HPMC , makwaara dị ka hydroxypromellose, bụ a na-acha ọcha na-acha ọcha cellulose ether ntụ ntụ ma ọ bụ granule nke nwere mmiri oyi solubility na mmiri ọkụ insolubility yiri methyl cellulose.Otu Hydroxypropyl na otu methyl bụ njikọ ether na mgbanaka glucose anhydrous nke cellulose jikọtara ọnụ, bụ ụdị nke na-abụghị ionic cellulose agwakọta ether.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.
1. Usoro mmepụta
Kraft pulp nwere ọdịnaya αcellulose nke 97%, viscosity intrinsic nke 720mL / g na ogologo eriri ogologo nke 2.6mm ka etinyere na 49% NaOH ngwọta na 40℃ maka sekọnd 50.Mgbe ahụ, a na-ewepụ pulp ahụ iji wepụ ihe ngwọta 49% NaOH iji nweta alkali cellulose.The arọ ruru nke (49% NaOH aqueous ngwọta) ka (ike akụkụ nke pulp) na impregnation nzọụkwụ bụ 200. The arọ ruru nke NaOH na alkali cellulose ka siri ike na pulp bụ 1.49.A na-etinye cellulose alkali nke enwetara (20kg) n'ime ihe na-eme ka nrụgide dị n'ime ya nwee mkpasu iwe, wee kpochaa ya ma kpochaa ya na nitrogen iji wepụ oxygen nke ọma na reactor.Mgbe ahụ, a na-achịkwa okpomọkụ dị na reactor na 60 ℃ mgbe a na-emegharị ihe n'ime.
Mgbe ahụ 2.4kg dME gbakwụnye na okpomọkụ na reactor na-achịkwa ka 60 ℃.Mgbe mgbakwunye nke dimethyl ether, methylene chloride na-agbakwunyere na-eme ka molar ratio nke methylene chloride na NaOH na alkaline cellulose 1.3, propylene oxide na-agbakwunyere na-eme ka ịdị arọ nke propylene oxide ka siri ike na pulp 1.97, na okpomọkụ na reactor. A na-achịkwa ya site na 60 ℃ ruo 80 ℃.Mgbe ịgbakwunye chloromethane na propylene oxide, a na-achịkwa okpomọkụ dị na reactor site na 80 ℃ ruo 90 ℃.Ke adianade do, mmeghachi omume mere maka 20 nkeji na 90 ℃.
A na-ewepụ gas ahụ site na reactor ma wepụ crude hydroxypropyl methyl cellulose na reactor.Okpomọkụ nke crude hydroxypropyl methyl cellulose bụ 62 ℃.Tụọ mkpokọta 50% urughuru size na cumulative arọ dabeere urughuru size nkesa dabere na ruru nke crude hydroxypropyl methyl cellulose site oghere nke ise sieving, onye ọ bụla nwere a dị iche iche oghere size.
N'ihi ya, nkezi urughuru size nke keadighi rarii ahụ bụ 6.2mm.E webatara crude hydroxypropyl methyl cellulose n'ime kneader biaxial na-aga n'ihu (KRC kneader S1, L/D = 10.2, olu dị n'ime 0.12 L, ọsọ ntụgharị 150rpm) na ọsọ nke 10kg / hr, wee nweta crude hydroxypropyl methyl cellulose.N'ihi nha nha na-eji 5 ihuenyo nwere nha oghere dị iche iche, nkezi urughuru bụ 1.4mm.Na-agbakwunye mmiri ọkụ 80 ℃ na crude hydroxypropyl methyl cellulose na tank na njikwa okpomọkụ nke jaketị ahụ.Ọnụ ọgụgụ nke ịdị arọ nke crude hydroxypropyl methyl cellulose mebiri emebi na ngụkọta nke slurry bụ 0.1, ma nweta slurry.The slurry e kpaliri na a mgbe nile okpomọkụ nke 80 ℃ maka 60 nkeji.
Mgbe ahụ, a na-enye slurry ahụ na ọsọ ntụgharị nke 0.5 RPM yana nzacha nrụgide rotary (ngwaahịa BHS Sonthofen).Okpomọkụ nke grout bụ 93 ℃.Jiri mgbapụta na-ebunye slurry, mgbapụta mgbapụta mgbapụta bụ 0.2mpa.Ogo oghere nke nzacha nrụgide rotary bụ 80μm, ebe nzacha bụ 0.12m2.A na-enyocha slurry a na-enye na nzacha nrụgide rotary site na nzacha ma gbanwee ka ọ bụrụ achicha nzacha.A na-enye achịcha nzacha a na-esi na ya pụta na uzuoku 0.3mpa na mmiri ọkụ 95 ℃ nwere oke ruru 10.0 na akụrụngwa siri ike nke HYDROXYpropyl methyl cellulose a na-asa, nke a na-enyocha ya site na nzacha.
A na-enye mmiri ọkụ site na mgbapụta n'ikuku nke 0.2mpa.Mgbe enyechara mmiri ọkụ, a na-enye uzuoku 0.3mpa.Mgbe ahụ, mgbe ịsachara ngwaahịa, a na-ewepụ ya na nzacha n'elu site na scraper ma wepụ ya na igwe ịsa ahụ.A na-eme usoro site na ịnye slurry ruo n'ịwụsa ngwaahịa a na-asacha mgbe niile.Dị ka a tụrụ na-eji okpomọkụ - ihicha hygrometer, mmiri dị n'ime ngwaahịa a sachara bụ 52.8%.Ngwa igwe a na-asachapụ nke a napụtara na nzacha nrụgide rotary bụ igwe nkụ ikuku kpọrọ nkụ na 80 ℃, wee gwerie ya na igwe nri mmeri iji nweta hydroxypropyl methyl cellulose.
2.Angwa
A na-eji ngwaahịa HPMC eme ihe dị ka thickener, dispersant, binder, emulsifier na stabilizer na ụlọ ọrụ akwa.A na-ejikwa ya na resin sịntetik, petrochemical, seramiiki, akwụkwọ, akpụkpọ anụ, ọgwụ, nri, ihe ịchọ mma na ụlọ ọrụ ndị ọzọ.
Oge nzipu: Mar-23-2022