Hydroxypropyl methylcellulose (HPMC)bụ ogige polymer na-agbaze mmiri nke a na-ejikarị na-ewu, ọgwụ, nri na ụlọ ọrụ kemịkalụ. Ọ bụ ihe na-abụghị ionic cellulose ether nwetara site kemịkalụ mgbanwe nke eke cellulose, na ezi ndim, emulsification, stabilization na film-akpụ Njirimara. Otú ọ dị, n'okpuru ọnọdụ okpomọkụ dị elu, HPMC ga-enweta mmebi okpomọkụ, nke nwere mmetụta dị mkpa na nkwụsi ike ya na arụmọrụ ya na ngwa ndị bara uru.
Usoro mmebi okpomọkụ nke HPMC
Mbibi okpomọkụ nke HPMC gụnyere mgbanwe anụ ahụ yana mgbanwe kemịkal. A na-egosipụtakarị mgbanwe anụ ahụ dị ka evaporation mmiri, mgbanwe iko na mbelata viscosity, ebe mgbanwe kemịkalụ gụnyere mbibi nke ihe owuwu molekul, mkpochapụ otu ọrụ na usoro carbonization ikpeazụ.
1. Obere okpomọkụ dị ala (100-200 ° C): evaporation nke mmiri na mbido mbụ
N'okpuru ọnọdụ okpomọkụ dị ala (ihe dị ka 100 Celsius C), HPMC na-ebute evaporation mmiri na mgbanwe iko. Ebe ọ bụ na HPMC nwere ụfọdụ mmiri a na-ekekọta, mmiri a ga-eji nwayọọ nwayọọ na-ekpochapụ n'oge okpomọkụ, si otú a na-emetụta njirimara rheological ya. Na mgbakwunye, viscosity nke HPMC ga-ebelata na mmụba nke okpomọkụ. Mgbanwe ndị dị na ọkwa a bụ mgbanwe na akụrụngwa anụ ahụ, ebe usoro kemịkal na-anọgide na-agbanwe agbanwe.
Mgbe okpomọkụ na-aga n'ihu na-arị elu ruo 150-200 Celsius, HPMC na-amalite ịmalite mmeghachi omume mmebi kemịkalụ. A na-egosipụtakarị ya na mwepụ nke hydroxypropyl na methoxy functional group, na-ebute mbelata nke ịdị arọ molekụla na mgbanwe nhazi. N'oge a, HPMC nwere ike iwepụta ntakịrị ntakịrị obere ihe na-agbanwe agbanwe, dị ka methanol na propionaldehyde.
2. Ọkara okpomọkụ ogbo (200-300°C): isi nbibi na obere molekul ọgbọ.
Mgbe okpomọkụ na-abawanye ruo 200-300 Celsius, ọnụ ọgụgụ ire ere nke HPMC na-abawanye ngwa ngwa. Usoro nbibi bụ isi gụnyere:
Ether bond breakage: Isi yinye nke HPMC jikọtara ya na glucose mgbanaka nkeji, na ether bonds na ya ji nwayọọ nwayọọ na-agbaji n'okpuru okpomọkụ dị elu, na-eme ka agbụ polymer decompose.
Mmeghachi omume akpịrị ịkpọ nkụ: Ọdịdị mgbanaka shuga nke HPMC nwere ike nweta mmeghachi omume akpịrị ịkpọ nkụ n'ogo dị elu iji mepụta etiti na-adịghị akwụsi ike, nke na-esiwanyekwa n'ime ngwaahịa na-agbanwe agbanwe.
Ntọhapụ nke obere molekul na-agbanwe agbanwe: N'oge a, HPMC na-ewepụta CO, CO₂, H₂O na obere molecule organic matter, dị ka formaldehyde, acetaldehyde na acrolein.
Mgbanwe ndị a ga-eme ka ịdị arọ molekụla nke HPMC daa nke ukwuu, viscosity na-adaba nke ọma, ihe ahụ ga-amalite na-acha odo odo na ọbụna mepụta coking.
3. Ọnọdụ okpomọkụ dị elu (300-500 ° C): carbonization na coking
Mgbe okpomọkụ na-ebili n'elu 300°C, HPMC na-abanye n'ọkwa mmebi ihe ike. N'oge a, nkwụsi ike nke agbụ isi na ngbanwe nke obere ngwongwo molecule na-eduga na mbibi zuru oke nke ihe owuwu ihe, na n'ikpeazụ na-emepụta ihe ndị fọdụrụ na carbonaceous (coke). Mmeghachi omume ndị a na-abụkarị n'oge a:
Nbibi oxidative: N'ebe okpomọkụ dị elu, HPMC na-enweta mmeghachi omume oxidation iji mepụta CO₂ na CO, ma n'otu oge ahụ na-emepụta ihe fọdụrụnụ nke carbonaceous.
Mmeghachi omume coking: A na-agbanwe akụkụ nke ihe owuwu polymer ka ọ bụrụ ngwaahịa combustion na-ezughị ezu, dị ka ihe fọdụrụ carbon ojii ma ọ bụ coke.
Ngwaahịa na-agbanwe agbanwe: Gaa n'ihu na-ahapụpụta hydrocarbons dị ka ethylene, propylene, na methane.
Mgbe kpụ ọkụ n'ọnụ na ikuku, HPMC nwere ike n'ihu na-ere ọkụ, mgbe kpo oku na-anọghị oxygen tumadi emepụta carbonized residues.
Ihe ndị na-emetụta mbelata okpomọkụ nke HPMC
Ọtụtụ ihe na-emetụta mmebi okpomọkụ nke HPMC, gụnyere:
Ọdịdị kemịkal: Ogo nke nnọchi nke hydroxypropyl na methoxy dị na HPMC na-emetụta nkwụsi ike ya. N'ikwu okwu n'ozuzu, HPMC nwere ọdịnaya hydroxypropyl dị elu nwere nkwụsi ike okpomọkụ ka mma.
Ikuku ikuku: N'ikuku, HPMC na-enwekarị mbibi oxidative, ebe ọ nọ na gburugburu gas inert (dị ka nitrogen), ọ̀tụ̀tụ̀ ikpo ọkụ ọkụ ya na-eji nwayọọ nwayọọ.
Ọnụọgụ ikpo ọkụ: Igwe ọkụ ngwa ngwa ga-eduga na ire ere ngwa ngwa, ebe ikpo ọkụ na-adịghị ngwa nwere ike inyere HPMC aka iji nwayọọ nwayọọ mee ka carbonize ma belata mmepụta nke ngwaahịa na-agbanwe gas.
Ọdịnaya mmiri: HPMC nwere ụfọdụ mmiri agbụ. N'oge usoro kpo oku, ikuku nke mmiri ga-emetụta okpomọkụ mgbanwe iko ya na usoro mmebi.
Mmetụta ngwa bara uru nke mmebi okpomọkụ nke HPMC
Njirimara mmebi okpomọkụ nke HPMC dị oke mkpa na mpaghara ngwa ya. Ọmụmaatụ:
Ụlọ ọrụ ihe owuwu: A na-eji HPMC mee ihe na ciment mortar na ngwaahịa gypsum, na nkwụsi ike ya n'oge a na-ewu ụlọ okpomọkụ ka a ga-atụle iji zere mmebi na-emetụta arụmọrụ njikọ.
Ụlọ ọrụ na-emepụta ọgwụ: HPMC bụ ihe ntọhapụ na-achịkwa ọgwụ, na a ga-ezere ire ere n'oge mmepụta okpomọkụ dị elu iji hụ na nkwụsi ike nke ọgwụ ahụ.
Ụlọ ọrụ nri: HPMC bụ ihe mgbakwunye nri, yana njirimara mmebi ọkụ ya na-ekpebi itinye ya n'ọrụ na ịsa na nhazi okpomọkụ.
The thermal mmebi usoro nkeHPMCenwere ike kewaa n'ime mmiri evaporation na mbido mbụ n'ime ọnọdụ okpomọkụ dị ala, nkwụsị nke isi ihe na obere mkpụkọ molecule na ọnọdụ okpomọkụ, na carbonization na coking na oke okpomọkụ. A na-emetụta nkwụsi ike nke okpomọkụ ya site na ihe ndị dị ka nhazi kemịkalụ, ikuku gburugburu, ọkụ ọkụ na ọdịnaya mmiri. Ịghọta usoro nbibi okpomọkụ nke HPMC bara uru dị ukwuu iji bulie ngwa ya ma melite nkwụsi ike ihe.
Oge nzipu: Mar-28-2025