Hydroxypropyl methyl cellulose HPMC bụ ngwakọta ether nke na-abụghị ionic cellulose n'ọtụtụ dị iche iche na ionic methyl carboxymethyl cellulose ngwakọta ether, ọ naghị emeghachi omume na ọla dị arọ. Otu ihe na-akpata oxygen n'ihi ọdịnaya hydroxypropyl methyl cellulose na oke dị iche iche nke ọdịnaya hydroxypropyl na viscosity, ghọrọ ụdị dị iche iche na arụmọrụ, dịka ọmụmaatụ, ọdịnaya methoxyl dị elu na obere ọdịnaya nke ụdị hydroxypropyl, arụmọrụ ya dị nso na methyl cellulose na obere ọdịnaya methoxyl na nnukwu ọdịnaya nke ụdị hydroxypropyl, arụmọrụ ya dịkwa nso na hydroxypropyl methyl cellulose ka emepụtara. Mana na ụdị ọ bụla, ọ bụ ezie na ọ nwere naanị obere hydroxypropyl ma ọ bụ obere ego nke methoxy, mgbaze na ihe mgbaze organic ma ọ bụ okpomọkụ flocculation na mmiri mmiri, enwere nnukwu ọdịiche.
1, hydroxypropyl methyl cellulose na-agbaze
Hydroxypropyl methyl cellulose n'ime mmiri nke hydroxypropyl methyl cellulose bụ n'ezie ụdị propylene oxide (methyl oxypropyl ring) nke methyl cellulose gbanwere, yabụ ọ ka nwere ihe yiri ya na methyl cellulose mmiri oyi nke na-agbaze na mmiri ọkụ nke na-anaghị agbaze. Agbanyeghị, okpomọkụ gelation nke hydroxy propyl agbanwere agbanwe dị elu karịa nke methyl cellulose na mmiri ọkụ. Dịka ọmụmaatụ, viscosity nke hydroxypropyl methylcellulose mmiri mmiri nwere 2% methoxy ọdịnaya DS=0.73 na hydroxypropyl ọdịnaya MS=0.46 bụ 500 mpa na 20℃. Okpomọkụ gel nke ngwaahịa S dị nso na 100℃, ebe nke methyl cellulose nke otu okpomọkụ ahụ bụ naanị ihe dị ka 55℃. Maka mmiri ịgbaze ya nke ọma, dịka ọmụmaatụ, mgbe e gwepịasịrị hydroxypropyl methylcellulose (ụdị ọka 0.2 ~ 0.5mm na 20℃ 4% mmiri viscosity nke 2pA? S ngwaahịa nwere ike ịgbaze ngwa ngwa na mmiri na-ajụghị oyi n'ime ụlọ okpomọkụ.
(2) Hydroxypropyl methyl cellulose na ihe mgbaze organic nke hydroxypropyl methyl cellulose na ihe mgbaze organic nke na-agbaze, dịkwa mma karịa methyl cellulose, mkpa methyl cellulose na ọkwa mgbanwe methoxy nke 2.1 ma ọ bụ karịa ngwaahịa, ma nwee hydroxypropyl MS=1.5~1.8 na methoxy DS=0.2~1.0, High viscosity hydroxypropyl methyl cellulose nke nwere ogo nnọchi zuru oke karịa 1.8 na-agbaze na methanol na ethanol anhydrous, ma nwee thermoplastic na mmiri na-agbaze. Ọ na-agbazekwa na hydrocarbons chlorine dị ka dichloromethane na trichloromethane, yana ihe mgbaze organic dị ka acetone, isopropyl alcohol, na diacetone alcohol. Ọ na-agbaze na ihe mgbaze organic dị mma karịa mmiri.
2, viscosity nke hydroxypropyl methyl cellulose nke ihe ndị na-emetụta ya
Ihe ndị na-akpata viscosity nke Hydroxypropyl methylcellulose na-ekpebi viscosity ọkọlọtọ nke hydroxypropyl methylcellulose, na cellulose ether ndị ọzọ bụ otu ihe ahụ, dị na 20℃ yana mmiri mmiri 2% dịka mkpebi ọkọlọtọ. viscosity nke otu ngwaahịa ahụ, na mmụba nke ntinye na mmụba, otu ntinye nke ngwaahịa dị iche iche dị arọ nke molekul, ibu molekul nke ngwaahịa ahụ bụ viscosity dị elu. Mmekọrịta ya na okpomọkụ yiri nke methyl cellulose. Mgbe okpomọkụ rịrị elu, viscosity na-amalite ịda, mana mgbe ọ ruru okpomọkụ ụfọdụ, viscosity na-ebili na mberede wee mee gelation. Okpomọkụ gelation nke ngwaahịa nwere obere viscosity dị elu karịa nke ngwaahịa nwere nnukwu viscosity. Ọkwa nke isi gel ya, na mgbakwunye na nnukwu na obere viscosity nke ether, kamakwa na oke nhazi otu ether methoxy na hydroxypropyl na oke nnọchi zuru oke nwere njikọ. A ghaghị ịmara na hydroxypropyl methylcellulose bụkwa pseudoplastic; ngwọta ya kwụsiri ike mgbe echekwara na okpomọkụ ụlọ ma ọ naghị egosi mmebi ọ bụla nke viscosity ma e wezụga ohere nke mmebi enzymatic.
3, hydroxypropyl methyl cellulose acid na alkaline resistance
Hydroxypropyl methylcellulose acid alkali hydroxypropyl methylcellulose acid na alkali, n'ozuzu ya, ọ naghị emetụta PH PH2 ~ 12, ọ nwere ike iguzogide ụfọdụ acid dị nro, dị ka formic acid, acetic acid, citric acid, succinic acid, phosphoric acid, boric acid, wdg. Mana acid a na-etinye n'ime ya nwere mmetụta nke ibelata viscosity. Alkali dị ka caustic soda, caustic potassium na mmiri lime enweghị mmetụta ọ bụla na ya, mana mmetụta nke ịbawanye viscosity nke ngwọta ahụ ga-ebelata nwayọ nwayọ n'ọdịnihu.
4, enwere ike ịgwakọta hydroxypropyl methyl cellulose
Enwere ike ịgwakọta ngwọta Hydroxypropyl methyl cellulose na ngwakọta polymer na-agbaze mmiri, wee bụrụ ngwọta doro anya nke nwere oke viscosity. Ngwakọta molekul ndị a dị elu bụ polyethylene glycol, polyvinyl acetate, polysilicone, polymethyl vinyl siloxane na hydroxyethyl cellulose na methyl cellulose, wdg. Ngwakọta polymer eke dịka gum Arabic, locust bean gum, thorn tree gum na ndị ọzọ nwekwara ezigbo ngwakọta na ngwọta ya. Enwere ike ịgwakọta Hydroxypropyl methyl cellulose na stearic acid ma ọ bụ palmitic acid mannitol ester ma ọ bụ sorbitol ester, kamakwa na glycerol, sorbitol na mannitol, enwere ike iji ngwakọta ndị a dị ka hydroxypropyl methyl cellulose plasticizer.
5, hydroxypropyl methyl cellulose nke a na-agbaze n'ime mmiri anaghị agbaze
Hydroxypropyl methyl cellulose cellulose nke na-agbaze mmiri na-agbaze, nwere ike ịbụ njikọ elu na aldehydes, ma mee ka ether ndị a na-agbaze mmiri na-agbaze na mmiri, ghọọ ndị na-anaghị agbaze na mmiri. Ma mee ka aldehyde hydroxypropyl methylcellulose nke na-agbaze ngwa ngwa, formaldehyde, glyoxal, succinaldehyde, dialdehyde, wdg, ojiji nke formaldehyde kwesịrị ilebara anya nke ọma na uru PH nke ngwọta ahụ, nke mmeghachi omume glyoxal na-eme ngwa ngwa, yabụ na mmepụta ụlọ ọrụ mmepụta ihe a na-ejikarị glyoxal eme ihe dị ka ihe na-ejikọ ọnụ. Usoro nke ụdị ihe na-ejikọ ọnụ a na ngwọta bụ 0.2% ~ 10% nke oke ether, nke kachasị mma bụ 7% ~ 10%, dịka iji glyoxal na 3.3% ~ 6% bụ nke kacha mma. Okpomọkụ ọgwụgwọ izugbe bụ 0 ~ 30℃, oge bụ 1 ~ 120 nkeji. A ghaghị ime mmeghachi omume njikọ ọnụ n'okpuru ọnọdụ acidic. N'ozuzu, a na-etinye acid siri ike ma ọ bụ organic carboxylic acid na ngwọta ahụ iji gbanwee PH nke ngwọta ahụ ruo ihe dị ka 2-6, ọkacha mma n'etiti 4-6, wee tinye aldehydes maka mmeghachi omume njikọta. Acid ndị e ji mee ihe bụ hydrochloric acid, sulfuric acid, phosphoric acid, formic acid, acetic acid, hydroxy acetic acid, succinic acid ma ọ bụ citric acid, nke formic acid ma ọ bụ acetic acid kacha mma, ebe formic acid bụ nke kacha mma. Enwere ike ịgbakwunye asịd na aldehydes n'otu oge iji kwe ka ngwọta ahụ jikọta na oke PH achọrọ. A na-ejikarị mmeghachi omume a eme ihe na usoro ikpeazụ nke usoro nkwadebe cellulose ether, ka cellulose ether ghara ịgbaze, ọ dị mfe iji mmiri 20-25℃ saa ma sachaa. Mgbe ejiri ngwaahịa ahụ, enwere ike itinye ihe alkaline na ngwọta nke ngwaahịa ahụ iji gbanwee PH nke ngwọta ahụ ka ọ bụrụ alkaline, a na-agbazekwa ngwaahịa ahụ ngwa ngwa na ngwọta ahụ. A pụkwara iji usoro a mee ihe mgbe ejiri ihe ngwọta cellulose ether mee ihe nkiri, e mesịa, a na-eme ka ihe nkiri ahụ bụrụ ihe na-anaghị agbaze agbaze.
6, hydroxypropyl methyl cellulose mgbochi enzyme
Nguzogide enzyme nke ihe ndị sitere na cellulose na ozizi, dịka otu anhydroglucose ọ bụla dị ka enwere ngwakọta siri ike nke otu ndị na-anọchi otu, mbuze nke obere ihe ndị dị ndụ adịghị mfe ibute ọrịa, mana n'eziokwu ngwaahịa emechara iji dochie uru karịa 1, site na mbibi enzyme, nke a bụ nkọwa nke otu ọ bụla na ọkwa nnọchi cellulose yinye abụghị otu, obere ihe ndị dị ndụ nwere ike imebi nso otu glucose akpọnwụrụ akpọnwụ na-enweghị nnọchi iji mepụta shuga, nke obere ihe ndị dị ndụ nwere ike ịmịkọrọ dị ka nri. Ya mere, ọ bụrụ na ọkwa nnọchi etherification nke cellulose abawanye, a ga-eme ka iguzogide cellulose ether na mbibi enzymatic dịkwuo mma. A kọrọ na n'okpuru ọnọdụ a na-achịkwa, viscosity fọdụrụ nke hydroxypropyl methyl cellulose (DS=1.9), methyl cellulose (DS=1.83), methyl cellulose (DS=1.66), na hydroxyethyl cellulose (1.7%) bụ 13.2%, 7.3%, 3.8%, na 1.7%, n'otu n'otu. Hydroxypropyl methyl cellulose nwere ike igbochi enzyme siri ike. Ya mere, hydroxypropyl methylcellulose bụ ọgwụ mgbochi enzyme dị mma, yana mgbasa ya dị mma, ịka nká na nhazi ihe nkiri, nke etinyere na mkpuchi emulsion, wdg., anaghị achọ itinye ihe nchekwa. Agbanyeghị, iji gbochie nchekwa ogologo oge nke ngwọta ahụ ma ọ bụ mmetọ nwere ike ime site na ụwa mpụga, enwere ike ịgbakwunye ihe nchekwa, nke enwere ike ikpebi nhọrọ ya dịka ihe ikpeazụ achọrọ maka ngwọta ahụ si dị. Phenylmercuric acetate na manganese fluosilicate bụ ihe nchekwa dị irè, mana ha na-egbu egbu ma a ga-eji nlezianya rụọ ọrụ. N'ozuzu, enwere ike itinye 1 ~ 5mg phenylmercuric acetate na lita ọ bụla nke ngwọta ahụ.
7, arụmọrụ akpụkpọ ahụ hydroxypropyl methyl cellulose
Ọrụ ihe nkiri Hydroxypropyl methyl cellulose nke hydroxypropyl methyl cellulose nwere ihe nkiri dị mma, ihe ngwọta mmiri ya ma ọ bụ ihe ngwọta organic, nke a na-ekpuchi na efere iko, mgbe ọ kpọnwụrụ, ọ na-aghọ ihe nkiri na-enweghị agba, doro anya ma sie ike. Ọ nwere ezigbo iguzogide mmiri ma na-anọgide na-esi ike na okpomọkụ dị elu. Dịka mgbakwunye nke plasticizer hygroscopic, nwere ike ime ka ogologo ya na mgbanwe ya dịkwuo elu, iji melite mgbanwe, glycerol na sorbitol na plasticizer ndị ọzọ bụ ihe kacha mma. Ngụkọta ngwọta izugbe bụ 2% ~ 3%, dose plasticizer bụ 10% ~ 20% nke cellulose ether. Ọ bụrụ na ọdịnaya nke plasticizer dị na ya, ihe mberede nke colloid akọrọ nwere ike ime na oke iru mmiri. Ike nrụgide nke plasticizer ihe nkiri agbakwunyere buru ibu karịa nke a na-agbakwunyeghị, ọ na-abawanye ka mmụba nke ọnụọgụ agbakwunyere, ebe maka hygroscopicity nke ihe nkiri ahụ na-abawanye ka mmụba nke ọnụọgụ plastikizer.
Oge ozi: Sep-08-2022