Hydroxypropyl methylcellulose (HPMC) bụ ihe na-abụghị ionic cellulose ether nke a na-ejikarị na nkà mmụta ọgwụ, nri, ihe owuwu na ubi ndị ọzọ, karịsịa na mbadamba nkume na-ahapụ ọgwụ na ihe ụlọ. Ọmụmụ nke mmebi ọkụ nke HPMC abụghị naanị ihe dị mkpa maka ịghọta mgbanwe arụmọrụ enwere ike izute n'oge nhazi, kamakwa ọ dị oke mkpa maka ịmepụta ihe ọhụrụ na imeziwanye ndụ ọrụ na nchekwa nke ngwaahịa.
Njirimara mmebi okpomọkụ nke HPMC
Mbibi okpomọkụ nke hydroxypropyl methylcellulose na-emetụta nke ọma site na nhazi ihe omimi ya, okpomọkụ okpomọkụ na ọnọdụ gburugburu ebe obibi ya (dịka ikuku, iru mmiri, wdg). Usoro ihe omimi ya nwere ọnụ ọgụgụ dị ukwuu nke hydroxyl dị iche iche na ether bonds, ya mere ọ na-adịkarị mfe mmeghachi omume kemịkal dị ka oxidation na decomposition na okpomọkụ dị elu.
A na-ekekarị usoro mmebi okpomọkụ nke HPMC n'ọtụtụ ọkwa. Nke mbụ, na okpomọkụ dị ala (ihe dị ka 50-150 Celsius C), HPMC nwere ike ịnweta nnukwu mfu n'ihi mfu nke mmiri efu na mmiri adsorbed, mana usoro a anaghị agụnye nkwụsị nke njikọ kemịkal, naanị mgbanwe anụ ahụ. Ka okpomọkụ na-arị elu n'ihu (n'elu 150 ° C), ether bonds na hydroxyl otu dị na HPMC na-amalite imebi, na-ebute nkwụsị nke eriri molekụla na mgbanwe na nhazi ahụ. Kpọmkwem, mgbe HPMC na-ekpo ọkụ n'ihe dịka 200-300 Celsius, ọ na-amalite ịmalite ire ere ọkụ, n'oge ahụ, ìgwè hydroxyl na agbụ akụkụ dị ka methoxy ma ọ bụ hydroxypropyl na molekul ahụ ji nwayọọ nwayọọ na-agbaze iji mepụta obere ngwaahịa molekụla dị ka methanol, formic. acid na obere mmiri nke hydrocarbon.
Usoro mmebi okpomọkụ
Usoro mmebi okpomọkụ nke HPMC dị mgbagwoju anya ma na-agụnye ọtụtụ usoro. Enwere ike ịchịkọta usoro mbibi ya dị ka ndị a: ka okpomọkụ na-ebili, njikọ ether dị na HPMC ji nwayọọ nwayọọ na-agbaji iji mepụta obere iberibe molekụla, bụ nke na-esiwanye ike ịhapụ ngwaahịa gas dị ka mmiri, carbon dioxide, na carbon monoxide. Ụzọ mmebi okpomọkụ ya bụ isi gụnyere usoro ndị a:
Usoro akpịrị ịkpọ nkụ: HPMC na-atụfu mmiri a na-ekpo ọkụ n'anụ ahụ na ntakịrị mmiri a kpara akpa na obere okpomọkụ, usoro a anaghị emebi usoro kemịkal ya.
Mmebi nke otu hydroxyl: N'ebe okpomọkụ dị ihe dị ka 200-300 Celsius, ìgwè hydroxyl dị na HPMC molecular chain na-amalite pyrolyze, na-emepụta mmiri na hydroxyl radicals. N'oge a, agbụ akụkụ methoxy na hydroxypropyl na-eji nwayọọ nwayọọ na-agbaze iji mepụta obere ụmụ irighiri ihe dị ka methanol, formic acid, wdg.
Njiji agbụ ígwè: Mgbe okpomọkụ na-abawanye ruo 300-400 Celsius C, njikọ β-1,4-glycosidic nke cellulose main chain ga-enweta pyrolysis iji mepụta obere ngwaahịa na-agbanwe agbanwe na carbon residues.
Mgbawa ọzọ: Mgbe okpomọkụ na-arị elu karịa 400 Celsius, hydrocarbons fọdụrụnụ na ụfọdụ iberibe cellulose mebiri emebi ga-enwekwu mgbawa iji mepụta CO2, CO na ụfọdụ obere ihe ndị ọzọ dị ndụ.
Ihe ndị na-emetụta mmebi okpomọkụ
Ọtụtụ ihe na-emetụta mmebi ọkụ nke HPMC, ọkachasị gụnyere akụkụ ndị a:
Okpomọkụ: Ọnụego na ogo nke mmebi okpomọkụ nwere njikọ chiri anya na okpomọkụ. N'ozuzu, ka okpomọkụ dị elu, ngwa ngwa mmeghachi omume mmebi ahụ na ọkwa dị elu nke mmebi. N'ime ngwa bara uru, otu esi ejikwa okpomọkụ nhazi ka ịzenarị oke okpomọkụ nke HPMC bụ okwu chọrọ nlebara anya.
Atmosphere: Omume mmebi okpomọkụ nke HPMC n'ime ikuku dị iche iche dịkwa iche. N'ime ikuku ma ọ bụ ikuku oxygen, HPMC dị mfe oxidize, na-emepụta ihe ndị ọzọ gaseous na carbon residues, ebe na ikuku inert (dị ka nitrogen), a na-egosipụtakarị usoro mmebi ahụ dị ka pyrolysis, na-emepụta ntakịrị ihe fọdụrụnụ nke carbon.
Arọ molecular: Arọ molikula nke HPMC na-emetụtakwa omume mmebi okpomọkụ ya. Ihe dị elu nke ịdị arọ molekụla, nke dị elu nke mmalite okpomọkụ nke mmebi okpomọkụ. Nke a bụ n'ihi na ibu molekụla dị elu HPMC nwere agbụ molekụla ogologo yana ihe kwụsiri ike karị, ma na-achọ ike dị elu iji mebie njikọ molekụla ya.
Ọdịnaya mmiri: Ọdịnaya mmiri dị na HPMC na-emetụtakwa mmebi okpomọkụ ya. Mmiri nwere ike belata okpomọkụ ire ere ya, na-ekwe ka mmebi ahụ mee na okpomọkụ dị ala.
Mmetụta ngwa nke mmebi okpomọkụ
Njirimara mmebi okpomọkụ nke HPMC nwere mmetụta dị mkpa na ngwa ya bara uru. Dịka ọmụmaatụ, na nkwadebe ọgwụ, a na-ejikarị HPMC eme ihe dị ka ihe ntọhapụ iji jikwaa ọnụego ntọhapụ ọgwụ. Otú ọ dị, n'oge nhazi ọgwụ, okpomọkụ dị elu ga-emetụta nhazi nke HPMC, si otú ahụ gbanwee ọrụ ntọhapụ nke ọgwụ ahụ. Ya mere, ịmụ banyere omume mmebi okpomọkụ ya dị oke mkpa maka ịkwalite nhazi ọgwụ na ịhụ nkwụsi ike ọgwụ.
N'ihe owuwu ụlọ, a na-ejikarị HPMC eme ihe n'ịrụpụta ngwaahịa dị ka ciment na gypsum iji rụọ ọrụ n'ịdị arọ na njide mmiri. Ebe ọ bụ na ihe ụlọ na-achọkarị ịnweta ebe okpomọkụ dị elu mgbe etinyere ya, nkwụsi ike okpomọkụ nke HPMC bụkwa ihe dị mkpa maka nhọrọ ihe. N'ebe okpomọkụ dị elu, mmebi okpomọkụ nke HPMC ga-eduga n'ịbelata arụmọrụ ihe onwunwe, ya mere, mgbe ị na-ahọrọ na iji ya, a na-atụle ọrụ ya na okpomọkụ dị iche iche.
Usoro mmebi okpomọkụ nke hydroxypropyl methylcellulose (HPMC) gụnyere ọtụtụ usoro, nke na-emetụtakarị okpomọkụ, ikuku, ịdị arọ molecular na ọdịnaya mmiri. Usoro mmebi okpomọkụ ya gụnyere akpịrị ịkpọ nkụ, mwepu nke hydroxyl na ụdọ akụkụ, na mgbawa nke agbụ isi. The thermal mbibi e ji mara nke HPMC nwere mkpa ngwa pụtara na ubi nke ọgwụ nkwadebe, ụlọ ihe, wdg Ya mere, a miri emi nghọta nke ya thermal mmebi omume dị oké mkpa maka optimizing usoro imewe na melite ngwaahịa arụmọrụ. Na nyocha n'ọdịnihu, enwere ike imeziwanye nkwụsi ike nke HPMC site na mgbanwe, na-agbakwụnye stabilizers, wdg, si otú ahụ gbasaa mpaghara ngwa ya.
Oge nzipu: Ọktoba 25-2024