Hydroxypropyl methylcellulose (HPMC)bụ ihe ether a gwakọtara agwakọta nke na-abụghị ionic, nke a na-agbaze na mmiri. Ọdịdị ya bụ ntụ ntụ ọcha ruo ntakịrị odo odo ma ọ bụ ihe granular, enweghị uto, enweghị isi, anaghị egbu egbu, ọ kwụsiri ike na kemịkalụ, ma na-agbaze na mmiri iji mepụta ngwọta dị nro, doro anya na viscous. Otu n'ime ihe ndị kacha mkpa nke hydroxypropyl methylcellulose n'ọrụ bụ na ọ na-eme ka mmiri ahụ dịkwuo mma. Mmetụta nke ọkpụrụkpụ dabere na ogo polymerization (DP) nke ngwaahịa ahụ, njupụta nke cellulose ether na mmiri mmiri, ọnụego shear, na okpomọkụ ngwọta. Na ihe ndị ọzọ.
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Ụdị mmiri mmiri nke ngwọta mmiri HPMC
N'ozuzu, nrụgide nke mmiri dị n'ime mmiri dị n'ime mmiri dị n'ime mmiri nwere ike ịpụta dịka naanị ọnụego shear ƒ(γ), ma ọ bụrụhaala na ọ dabereghị na oge. Dabere n'ụdị ƒ(γ), enwere ike kewaa mmiri dị iche iche, ya bụ: mmiri Newtonian, mmiri dilatant, mmiri pseudoplastic na mmiri plastic Bingham.
E kewara ethers cellulose n'ime ụdị abụọ: otu bụ cellulose ether nke na-abụghị ionic, nke ọzọ bụ ionic cellulose ether. Maka rheology nke ụdị cellulose ethers abụọ a. SC Naik na ndị otu ya mere nnyocha zuru oke na nke usoro na ngwọta hydroxyethyl cellulose na sodium carboxymethyl cellulose. Nsonaazụ gosiri na ma ngwọta ether cellulose nke na-abụghị ionic na ngwọta ether cellulose ionic bụ pseudoplastic. Mmiri mmiri, ya bụ, mmiri na-abụghị Newtonian, na-abịaru mmiri Newtonian naanị na obere njupụta. Pseudoplasticity nke ngwọta hydroxypropyl methylcellulose na-arụ ọrụ dị mkpa na ngwa. Dịka ọmụmaatụ, mgbe etinyere ya na mkpuchi, n'ihi njirimara shear thinning nke ngwọta mmiri mmiri, viscosity nke ngwọta ahụ na-ebelata ka ọnụego shear na-abawanye, nke na-eme ka mgbasa nke ihe pigment dị iche iche dịkwuo mma, ma na-emekwa ka mmiri mmiri nke mkpuchi ahụ dịkwuo elu. Mmetụta ya dị oke ukwuu; mgbe ọ na-ezu ike, viscosity nke ngwọta ahụ buru ibu, nke na-egbochi itinye ihe pigment n'ime mkpuchi ahụ nke ọma.
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Usoro Nnwale Viscosity HPMC
Ihe ngosi dị mkpa iji tụọ mmetụta siri ike nke hydroxypropyl methylcellulose bụ viscosity doro anya nke mmiri mmiri. Ụzọ nha nke viscosity doro anya na-agụnyekarị usoro viscosity capillary, usoro viscosity ntụgharị na usoro viscosity bọọlụ na-ada ada.
ebe: bụ viscosity doro anya, mPa s; K bụ viscosometer na-agbanwe agbanwe; d bụ njupụta nke ihe nlele ngwọta na 20/20°C; t bụ oge maka ngwọta ahụ ịgafe n'akụkụ elu nke viscometer ruo akara ala, s; A na-atụ oge mmanụ ọkọlọtọ na-agafe na viscometer.
Agbanyeghị, ụzọ e si atụ ihe site na iji capillary viscometer na-enye nsogbu karịa.cellulose ethersỌ na-esiri ike inyocha site na iji ihe na-eme ka ọbara dị n'ọbara n'ihi na ihe ngwọta ndị a nwere obere ihe na-anaghị agbaze nke a na-achọpụta naanị mgbe a kpọchiri ihe na-eme ka ọbara dị n'ọbara. Ya mere, ọtụtụ ndị nrụpụta na-eji ihe na-eme ka ọbara dị n'ọbara iji chịkwaa ịdị mma nke hydroxypropyl methylcellulose. A na-ejikarị ihe na-eme ka ọbara dị n'ọbara Brookfield eme ihe na mba ofesi, a na-ejikwa ihe na-eme ka ọbara dị n'ọbara NDJ na China.
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Ihe ndị na-emetụta viscosity HPMC
3.1 Mmekọrịta ya na ọkwa nke nchịkọta
Ọ bụrụ na paramita ndị ọzọ anaghị agbanwe agbanwe, viscosity nke ngwọta hydroxypropyl methylcellulose na-adaba na ogo nke polymerization (DP) ma ọ bụ ibu molekul ma ọ bụ ogologo yinye molekul, ma na-abawanye ka ogo polymerization na-abawanye. Mmetụta a na-apụta ìhè karịa n'ihe gbasara obere ogo polymerization karịa n'ihe gbasara nnukwu ogo polymerization.
3.2 Mmekọrịta dị n'etiti viscosity na njupụta
Ọbara ọbara nke hydroxypropyl methylcellulose na-abawanye ka mmụba nke mkpokọta nke ngwaahịa ahụ na mmiri mmiri. Ọbụna obere mgbanwe mkpokọta ga-akpata nnukwu mgbanwe na viscosity. Site na viscosity aha nke hydroxypropyl methylcellulose Mmetụta nke mgbanwe nke mkpokọta ngwọta na viscosity nke ngwọta ahụ na-apụta ìhè karịa.
3.3 Mmekọrịta dị n'etiti viscosity na ọnụego shear
Mmiri Hydroxypropyl methylcellulose nwere ihe onwunwe nke ịcha ntutu. A na-akwadebe Hydroxypropyl methylcellulose nke viscosity dị iche iche n'ime mmiri mmiri 2%, a na-atụkwa viscosity ya na ọnụego ịcha ntutu dị iche iche n'otu n'otu. Nsonaazụ ya dị ka ndị a Dịka egosiri na eserese ahụ. Na obere ọnụego ịcha ntutu, viscosity nke mmiri hydroxypropyl methylcellulose agbanweghị nke ukwuu. Site na mmụba nke ọnụego ịcha ntutu, viscosity nke mmiri hydroxypropyl methylcellulose nwere viscosity dị elu belatara nke ọma, ebe ngwọta nwere obere viscosity ebelataghị nke ọma.
3.4 Mmekọrịta dị n'etiti viscosity na okpomọkụ
Ọnọdụ okpomọkụ na-emetụta oke viscosity nke mmiri hydroxypropyl methylcellulose. Ka okpomọkụ na-arị elu, viscosity nke mmiri ahụ na-ebelata. Dịka egosiri na eserese a, a na-akwadebe ya ka ọ bụrụ mmiri mmiri nwere njupụta nke 2%, a na-atụkwa mgbanwe nke viscosity na mmụba nke okpomọkụ.
3.5 Ihe ndị ọzọ na-emetụta mmadụ
A na-enwekwa mmetụta na viscosity nke mmiri mmiri nke hydroxypropyl methylcellulose site na ihe mgbakwunye dị na mmiri mmiri, uru pH nke mmiri mmiri ahụ, na mmebi nje bacteria. Ọtụtụ mgbe, iji nweta arụmọrụ viscosity ka mma ma ọ bụ belata ọnụ ahịa ojiji, ọ dị mkpa ịgbakwunye ihe ndị na-agbanwe rheology, dị ka ụrọ, ụrọ agbanwere agbanwe, ntụ polymer, starch ether na aliphatic copolymer, na mmiri mmiri nke hydroxypropyl methylcellulose. , enwere ike itinye electrolytes dị ka chloride, bromide, phosphate, nitrate, wdg. na mmiri mmiri. Ihe mgbakwunye ndị a agaghị emetụta naanị viscosity nke mmiri mmiri ahụ, kamakwa ọ ga-emetụta ihe ndị ọzọ e ji mee ihe nke hydroxypropyl methylcellulose dị ka idobe mmiri. , iguzogide sag, wdg.
Ọ fọrọ nke nta ka ọ ghara inwe mmetụta na mmiri mmiri nke hydroxypropyl methylcellulose site na acid na alkali, ọ na-adịgidekwa n'etiti 3 ruo 11. Ọ nwere ike iguzogide ụfọdụ asịd na-adịghị ike, dị ka formic acid, acetic acid, phosphoric acid, boric acid, citric acid, wdg. Agbanyeghị, asịd a chịkọtara ga-ebelata viscosity. Mana soda caustic, potassium hydroxide, mmiri lime, wdg enweghị mmetụta dị ukwuu na ya. Ma e jiri ya tụnyere cellulose ethers ndị ọzọ,hydroxypropyl methylcelluloseMmiri mmiri nwere ezigbo nkwụsi ike nke nje bacteria, isi ihe kpatara ya bụ na hydroxypropyl methylcellulose nwere otu hydrophobic nwere oke nnọchi na mgbochi steric nke otu. Agbanyeghị, ebe ọ bụ na mmeghachi omume nnọchi anaghị adị otu, obere nje bacteria na-emebi ihe na-eme ka anhydroglucose nke a na-etinyeghị aka ghara ịdị mfe, nke na-ebute mmebi nke mkpụrụ ndụ cellulose ether na scission nke agbụ. Arụmọrụ ya bụ na viscosity doro anya nke mmiri mmiri na-ebelata. Ọ bụrụ na ọ dị mkpa ịchekwa mmiri mmiri nke hydroxypropyl methylcellulose ruo ogologo oge, a na-atụ aro ka ị tinye obere ihe na-akpata nje bacteria ka viscosity ahụ ghara ịgbanwe nke ukwuu. Mgbe ị na-ahọrọ ihe na-egbochi fungal, ihe nchekwa ma ọ bụ fungicides, ị kwesịrị ịṅa ntị na nchekwa, ma họrọ ngwaahịa ndị na-adịghị egbu egbu nye ahụ mmadụ, nwere ihe ndị kwụsiri ike ma na-enweghị isi, dị ka DOW Chem's AMICAL fungicides, ihe nchekwa CANGUARD64, ihe nje bacteria FUELSAVER na ngwaahịa ndị ọzọ. nwere ike ịrụ ọrụ kwekọrọ na ya.
Oge ozi: Eprel-28-2024