Hydroxypropyl methylcellulose (HPMC) bụ ihe polymer nke a na-agbaze mmiri nke a na-ejikarị eme ihe n'ọgwụ, nri, ihe owuwu na ubi ndị ọzọ. Ọ nwere ezigbo nkwụsi ike okpomọkụ, mana ọ ka nwere ike ịla n'iyi n'okpuru oke okpomọkụ. Okpomọkụ mmebi nke HPMC na-emetụtakarị site na nhazi molekul ya, ọnọdụ gburugburu ebe obibi (dịka iru mmiri, uru pH) na oge ikpo ọkụ.
Okpomọkụ mmebi nke HPMC
Mmebi okpomọkụ nke HPMC na-amalitekarị ịpụta n'elu 200℃, na mmebi doro anya ga-eme n'etiti 250℃-300℃Kpọmkwem:
N'okpuru 100℃: HPMC na-egosikarị uzu mmiri na mgbanwe n'ihe gbasara ahụ, ọ dịghịkwa mmebi ọ bụla na-eme.
100℃-200℃: HPMC nwere ike ibute mmebi akụkụ n'ihi mmụba okpomọkụ mpaghara, mana ọ kwụsiri ike n'ozuzu ya.
200℃-250℃: HPMC na-egosi mbelata okpomọkụ nwayọ nwayọ, nke a na-egosipụtakarị dị ka mgbawa nhazi na ntọhapụ nke obere ihe ndị na-agbanwe agbanwe na molekul.
250℃-300℃: HPMC na-agbawa nke ọma, agba ya na-agba ọchịchịrị, a na-ewepụta obere molekul dịka mmiri, methanol, acetic acid, carbonization na-apụtakwa.
N'elu 300℃: HPMC na-emebi ngwa ngwa ma na-agbanwe kabon, ụfọdụ ihe ndị na-adịghị arụ ọrụ nke ọma ka na-adịkwa na njedebe.
Ihe ndị na-emetụta mmebi HPMC
Ibu molekụla na ogo nnọchi nke molekụla
Mgbe ibu molekul nke HPMC buru ibu, ike ya na-eguzogide okpomọkụ na-adịkarị elu.
Ọkwa nnọchi nke otu methoxy na hydroxypropoxy ga-emetụta nkwụsi ike okpomọkụ ya. HPMC nke nwere ọkwa mgbanwe dị elu na-ebelata ngwa ngwa na okpomọkụ dị elu.
Ihe gbasara gburugburu ebe obibi
Iru mmiri: HPMC nwere hygroscopicity siri ike, mmiri mmiri nwekwara ike ime ka mmebi ya dịkwuo ngwa ngwa n'oge okpomọkụ dị elu.
Uru pH: HPMC na-adị mfe karị maka hydrolysis na mmebi n'okpuru ọnọdụ siri ike nke acid ma ọ bụ alkali.
Oge ikpo ọkụ
Ịkpo ọkụ ruo 250℃ruo obere oge, ọ gaghị ere kpamkpam, ebe ịnọgide na-enwe okpomọkụ dị elu ruo ogologo oge ga-eme ka usoro mmebi ahụ dịkwuo ngwa ngwa.
Ngwaahịa mmebi nke HPMC
A na-esi na cellulose enweta HPMC, ngwaahịa mmebi ya yiri cellulose. N'oge usoro ikpo ọkụ, a pụrụ iwepụta ihe ndị a:
Mmiri anwụrụ (site na otu hydroxyl)
Methanol, ethanol (site na otu methoxy na hydroxypropoxy)
Asịdi Asịd (site na ngwaahịa ire ere)
Carbon oxides (CO, CO)₂, nke ọkụ nke ihe ndị dị ndụ mepụtara)
Obere ihe fọdụrụ na coke
Ngwa okpomọkụ iguzogide nke HPMC
Ọ bụ ezie na HPMC ga-eji nwayọ nwayọ daa karịa 200℃, a naghị ekpughe ya na oke okpomọkụ dị otú ahụ n'oge a na-etinye ya n'ezie. Dịka ọmụmaatụ:
Ụlọ ọrụ ọgwụ: A na-ejikarị HPMC eme ihe maka mkpuchi mbadamba na ihe ndị na-adịgide adịgide, nke a na-ejikarị arụ ọrụ na 60℃-80℃, nke dị ala karịa okpomọkụ mmebi ya.
Ụlọ ọrụ nri: Enwere ike iji HPMC dị ka ihe dị arọ ma ọ bụ emulsifier, okpomọkụ ojiji nkịtị anaghị adịkarị karịa 100℃.
Ụlọ ọrụ owuwu: A na-eji HPMC eme ihe dị ka ihe e ji simenti na ngwa agha kpụọ, okpomọkụ owuwu anaghịkwa agafe 80℃, ọ dịghịkwa mmebi ga-eme.
HPMC na-amalite ịdaba n'okpuru okpomọkụ karịa 200℃, na-agbaze nke ukwuu n'etiti 250℃-300℃, ma na-eme ka carbon dịkwuo elu ngwa ngwa karịa 300℃N'ọrụ bara uru, a ga-ezere ikpughe ogologo oge na gburugburu ebe okpomọkụ dị elu iji nọgide na-arụ ọrụ ya nke ọma.
Oge ozi: Eprel-03-2025