Hydroxypropyl methylcellulose (HPMC) bụ ihe polymer soluble mmiri nke a na-ejikarị na nkà mmụta ọgwụ, nri, ihe owuwu na ubi ndị ọzọ. Ọ nwere ezigbo nkwụsi ike nke okpomọkụ, mana ọ ka nwere ike ịdalata n'okpuru oke okpomọkụ. A na-emetụta ọnọdụ okpomọkụ nke HPMC nke ọma site na nhazi ihe omimi ya, ọnọdụ gburugburu ebe obibi (dịka iru mmiri, uru pH) na oge kpo oku.
Ọnọdụ nbibi nke HPMC
Mbelata okpomọkụ nke HPMC na-amalitekarị ịpụta karịa 200℃, na ire ere doro anya ga-eme n'etiti 250℃-300℃. Kpọmkwem:
N'okpuru 100℃: HPMC tumadi na-egosi na mmiri evaporation na mgbanwe na anụ ahụ Njirimara, na ọ dịghị mmebi emee.
100℃-200℃: HPMC nwere ike ịkpata oxidation akụkụ n'ihi mmụba okpomọkụ mpaghara, mana ọ kwụsiri ike n'ozuzu ya.
200℃-250℃: HPMC ji nwayọọ nwayọọ na-egosi nbibi nke okpomọkụ, bụ nke a na-egosipụtakarị dị ka ọkpụkpụ nhazi na ntọhapụ nke obere ihe ọkụkụ.
250℃-300℃: HPMC na-enweta ire ere doro anya, agba na-agba ọchịchịrị, a na-ahapụ obere mkpụrụ ndụ dị ka mmiri, methanol, acetic acid, na carbonization na-eme.
Karịrị narị atọ℃: HPMC na-eweda ngwa ngwa na carbonizes, na ụfọdụ inorganic bekee na-anọgide na njedebe.
Ihe ndị na-emetụta mmebi HPMC
Ibu molekụla na ogo nnọchi anya
Mgbe arọ molekụla nke HPMC buru ibu, nguzogide okpomọkụ ya na-adịkarị elu.
Ogo nke nnọchi nke methoxy na otu hydroxypropoxy ga-emetụta nkwụsi ike okpomọkụ ya. HPMC nwere ogo dị elu nke nnọchi na-eweda ya ngwa ngwa na oke okpomọkụ.
Ihe gbasara gburugburu ebe obibi
Iru mmiri: HPMC nwere hygroscopicity siri ike, na mmiri nwere ike mee ka mmebi ya dịkwuo elu na okpomọkụ dị elu.
Uru pH: HPMC nwere ike ịnweta hydrolysis na mmebi n'okpuru ọnọdụ acid siri ike ma ọ bụ alkali.
Oge ikpo ọkụ
Na-ekpo ọkụ ruo 250℃maka oge dị mkpirikpi nwere ike ọ gaghị emebi kpamkpam, ebe ị na-echekwa okpomọkụ dị elu ruo ogologo oge ga-eme ka usoro mmebi ahụ dịkwuo elu.
Ngwaahịa na-emebi emebi nke HPMC
A na-enweta HPMC nke ọma site na cellulose, na ngwaahịa mmebi ya yiri cellulose. N'oge usoro kpo oku, enwere ike ịhapụ ihe ndị a:
Vapor mmiri (sitere na otu hydroxyl)
Methanol, ethanol (nke sitere na methoxy na otu hydroxypropoxy)
Acetic acid (site na ngwaahịa ire ere)
Carbon oxides (CO, CO₂, nke a na-emepụta site na combustion nke organic okwu)
Obere ihe fọdụrụ coke
Ngwa ikpo ọkụ nke HPMC
Ọ bụ ezie na HPMC ga-eji nwayọọ nwayọọ na-eweda karịa 200℃, a naghị ekpughekarị ọnọdụ okpomọkụ dị otú ahụ na ngwa n'ezie. Ọmụmaatụ:
Ụlọ ọrụ na-emepụta ọgwụ: A na-ejikarị HPMC maka mkpuchi mbadamba na ndị na-ahapụ ya, na-arụkarị ọrụ na 60℃-80℃, nke dị nnọọ ala karịa okpomọkụ nbibi ya.
Ụlọ ọrụ nri: Enwere ike iji HPMC mee ihe dị ka thickener ma ọ bụ emulsifier, na okpomọkụ ojiji a na-emekarị adịghị agafe 100℃.
Ụlọ ọrụ ihe owuwu: A na-eji HPMC dị ka ciment na ngwa agha, na okpomọkụ a na-ewu anaghị agafe 80℃, ọ dịghịkwa nbibi agaghị eme.
HPMC na-amalite na-eweda thermal n'elu 200℃, na-emebi nke ọma n'etiti 250℃-300℃, na carbonize ngwa ngwa karịa 300℃. Na ngwa bara uru, a ga-ezere ikpughe ogologo oge na gburugburu ebe okpomọkụ dị elu iji nọgide na-arụ ọrụ ya.
Oge nzipu: Eprel-03-2025