Hydroxypropyl methylcellulose (HPMC) ni polymeri ishongeshwa n'amazi ikoreshwa cyane mu buvuzi, ibiribwa, ubwubatsi n'ahandi. Ifite ubushyuhe bwiza, ariko ishobora kwangirika iyo ubushyuhe buri hejuru. Ubushyuhe bwa HPMC bwangiritse ahanini buterwa n'imiterere ya molekile yayo, imiterere y'ibidukikije (nk'ubushuhe, pH) n'igihe cyo gushyushya.
Ubushyuhe bwa HPMC bwo kwangirika
Ubushyuhe bwa HPMC bukunze kugaragara hejuru ya 200℃, kandi ihinduka ry’ibintu rigaragara rizaba hagati ya 250℃-300℃By'umwihariko:
Munsi ya 100℃: HPMC igaragaza ahanini imyuka y'amazi n'impinduka mu miterere yayo, kandi nta kwangirika kubayeho.
100℃-200℃: HPMC ishobora gutera oxidation igice bitewe n'ubwiyongere bw'ubushyuhe bwo mu gace runaka, ariko muri rusange irahamye.
200℃-250℃: HPMC igenda igaragaza kwangirika k'ubushyuhe buhoro buhoro, bigaragazwa ahanini no kwangirika kw'imiterere no kurekurwa kwa molekile nto.
250℃-300℃: HPMC irabora ku buryo bugaragara, ibara rirushaho kwirabura, utunyangingo duto nka amazi, methanol, aside asetiki turarekurwa, kandi hakavuka karubone.
Hejuru ya 300℃: HPMC irangirika vuba kandi ikagira karuboni, kandi bimwe mu bintu bidakomoka ku binyabuzima bigumaho.
Ibintu bigira ingaruka ku kwangirika kwa HPMC
Uburemere bwa molekile n'urwego rwo gusimbuza
Iyo uburemere bwa molekile ya HPMC ari bunini, ubushyuhe bwayo bukunda kugabanuka cyane.
Urugero rwo gusimbuza amatsinda ya methoxy na hydroxypropoxy ruzagira ingaruka ku bushyuhe bwayo. HPMC ifite urugero rwo gusimbuza rworoshye kwangirika iyo ubushyuhe buri hejuru.
Ibintu bifitanye isano n'ibidukikije
Ubushuhe: HPMC ifite ubushobozi bwo gupima ubushyuhe bwinshi, kandi ubushuhe bushobora kwihutisha kwangirika kwayo iyo ubushyuhe bwinshi bukabije.
Agaciro ka pH: HPMC ishobora kwangirika cyane mu gihe cy’aside cyangwa alkali nyinshi.
Igihe cyo gushyushya
Gushyushya kugeza kuri 250℃igihe gito gishobora kutabora burundu, mu gihe kugumana ubushyuhe bwinshi igihe kirekire bizihutisha igikorwa cyo kwangirika.
Ibikoresho byo kwangirika kwa HPMC
HPMC ikomoka ahanini muri selulosi, kandi ibicuruzwa byayo byo kwangirika bisa na selulosi. Mu gihe cyo gushyushya, ibi bikurikira bishobora gusohoka:
Umwotsi w'amazi (ukomoka mu matsinda ya hydroxyl)
Methanoli, ethanoli (ikomoka mu matsinda ya methoxy na hydroxypropoxy)
Aside asetiki (ikomoka ku bicuruzwa bibora)
Oxyde za karuboni (CO, CO₂, biva mu gutwika ibintu bikomoka ku binyabuzima)
Ingano nto y'ibisigazwa bya koka
Ubudahangarwa bw'ubushyuhe bwa HPMC mu gukoresha
Nubwo HPMC izagenda igabanuka buhoro buhoro hejuru ya 200℃, ubusanzwe ntabwo ihura n'ubushyuhe bwinshi nk'ubwo mu bikorwa nyabyo. Urugero:
Inganda zikora imiti: HPMC ikoreshwa cyane cyane mu gusiga ibinini no mu gukora imiti igabanya ubukana, akenshi ikoreshwa kuri 60℃-80℃, ikaba iri hasi cyane ugereranyije n'ubushyuhe bwayo bwo kwangirika.
Inganda z'ibiribwa: HPMC ishobora gukoreshwa nk'ikintu gikomeza ubushyuhe cyangwa igabanya ubushyuhe, kandi ubushyuhe busanzwe bwo gukoreshwa ntabwo burenze dogere 100℃.
Inganda z'ubwubatsi: HPMC ikoreshwa nk'umuti wo gukurura sima n'uruvange rw'ibintu, kandi ubushyuhe bw'ubwubatsi muri rusange ntiburenga dogere 80℃, kandi nta kwangirika kuzabaho.
HPMC itangira kwangirika mu bushyuhe buri hejuru ya 200℃, ibora cyane hagati ya 250℃-300℃, kandi ihinduka vuba cyane hejuru ya dogere 300℃Mu bikorwa bifatika, kwirindwa igihe kirekire mu bidukikije bishyuha cyane kugira ngo bikomeze gukora neza.
Igihe cyo kohereza: Mata-03-2025