Hydroxypropyl Methylcellulose (HPMC) ni ubwoko bukunze gukoreshwa bwa cellulose bufite ibintu byinshi bitandukanye, nko mu miti, mu biribwa, mu bwubatsi no mu mavuta yo kwisiga. HPMC ni polymer idakoresha ioni, ikoze mu buryo bwa semi-synthetic, kandi idakora neza, ifite ubushobozi bwo gushonga neza mu mazi, gukomera, gufatana no gukora filime.
Imiterere n'imiterere ya HPMC
HPMC ni selulosi yahinduwe ikorwa binyuze mu guhuza selulosi na methyl chloride na propylene oxide. Imiterere yayo ya molekile irimo ibisimbura methyl na hydroxypropyl, biha HPMC imiterere yihariye y’umubiri n’iya shimi, nko gushonga neza, kurinda kolloyide no gukora filime. HPMC ishobora kugabanywamo imiterere myinshi hakurikijwe ibisimbura bitandukanye, kandi buri gipimo gifite uburyo butandukanye bwo gushonga n’ikoreshwa mu mazi.
Uburyo HPMC ishonga mu mazi
Uburyo bwo gusenya
HPMC ikorana n'uturemangingo tw'amazi binyuze mu migozi ya hydrogen kugira ngo ikore umuti. Uburyo bwo kuyisesa burimo uturemangingo tw'amazi twinjira buhoro buhoro hagati y'imigozi ya HPMC, bigasenya uburyo ihuza, bityo imigozi ya polymer ikwirakwira mu mazi kugira ngo ikore umuti umwe. Gushonga kwa HPMC bifitanye isano rya hafi n'uburemere bwa molekile yayo, ubwoko bwayo busimburana n'urwego rwo gusimbuza (DS). Muri rusange, uko urwego rwo gusimbuza molekile ruri hejuru, ni ko gushonga kwa HPMC mu mazi kwiyongera.
Ingaruka z'ubushyuhe ku gushonga kw'amazi
Ubushyuhe ni kimwe mu bintu by'ingenzi bigira ingaruka ku gushonga kwa HPMC. Gushonga kwa HPMC mu mazi bigaragaza imiterere itandukanye uko ubushyuhe buhinduka:
Ingano y'ubushyuhe bwo gushonga: HPMC iragoye gushonga mu mazi akonje (muri rusange iri munsi ya 40°C), ariko ishobora gushonga vuba iyo ishyushye kugeza kuri 60°C cyangwa irenga. Kuri HPMC ifite ubushyuhe buke, ubushyuhe bw'amazi bwa hafi 60°C ni bwo bushyuhe bwiza bwo gushonga. Kuri HPMC ifite ubushyuhe bwinshi, ingano y'ubushyuhe bwo gushonga ishobora kugera kuri 80°C.
Gukonjesha mu gihe cyo gukonjesha: Iyo umuti wa HPMC ushyushye ku bushyuhe runaka (ubusanzwe 60-80°C) mu gihe cyo gushonga hanyuma ugakonjeshwa buhoro buhoro, gel y'ubushyuhe irakorwa. Iyi gel y'ubushyuhe irakomera nyuma yo gukonjesha kugeza ku bushyuhe bw'icyumba kandi ishobora kongera gusigwa mu mazi akonje. Iki kintu gifite akamaro kanini mu gutegura imiti ya HPMC ku ntego runaka (nk'imiti ikomeza kurekura).
Ubushobozi bwo gusenya: Muri rusange, ubushyuhe bwinshi bushobora kwihutisha inzira yo gusenya ya HPMC. Ariko, ubushyuhe bwinshi bushobora no gutuma polymer yangirika cyangwa ikagabanuka mu buryo bwo gusenya. Kubwibyo, mu mikorere nyayo, ubushyuhe bukwiye bwo gusenya bugomba gutoranywa uko bikenewe kugira ngo hirindwe kwangirika bitari ngombwa no guhinduka kw'umutungo.
Ingaruka za pH ku gushonga kw'amazi
Nk’umuti utari uwoni, gushonga kwa HPMC mu mazi ntibigira ingaruka ku buryo butaziguye ku gaciro ka pH k’umuti. Ariko, imiterere ya pH ikabije (nk’ibidukikije bikomeye bya aside cyangwa alkaline) ishobora kugira ingaruka ku miterere ya HPMC mu gushonga:
Imiterere y’aside: Mu gihe cy’aside ikomeye (pH < 3), hari imiyoboro imwe n’imwe ya HPMC (nk’imiyoboro ya ether) ishobora kwangizwa n’umwuka urimo aside, bityo bigatuma ishonga neza kandi ikwirakwira. Ariko, mu rugero rusange rw’aside nke (pH 3-6), HPMC ishobora gushonga neza. Imiterere y’aside: Mu gihe cy’aside ikomeye (pH > 11), HPMC ishobora kwangirika, ibi akenshi biterwa n’uburyo hydrolysis y’umuyoboro wa hydroxypropyl ikora. Mu gihe cy’aside nke (pH 7-9), gushonga kwa HPMC akenshi ntibigira ingaruka zikomeye.
Uburyo bwo gusenya HPMC
Kugira ngo HPMC ishonge neza, ubusanzwe hakoreshwa uburyo bukurikira:
Uburyo bwo gukwirakwiza amazi akonje: Shyiramo buhoro buhoro ifu ya HPMC mu mazi akonje ubyutsa kugira ngo ayinyanyagize neza. Ubu buryo bushobora kubuza HPMC kwivanga mu mazi, maze umuti ugakora urwego rwo kurinda kolloidal. Hanyuma, ushyushye buhoro buhoro kugeza kuri 60-80°C kugira ngo uyishongeshe neza. Ubu buryo bukwiriye gushonga kwa HPMC nyinshi.
Uburyo bwo gukwirakwiza amazi ashyushye: Shyira HPMC mu mazi ashyushye hanyuma uyivange vuba kugira ngo uyishongeshe vuba ku bushyuhe bwinshi. Ubu buryo bukwiriye HPMC ifite ubushyuhe bwinshi, ariko hakwiye kwitabwaho kugenzura ubushyuhe kugira ngo hirindwe kwangirika.
Uburyo bwo gutegura umuti mbere yo kuwutegura: Ubwa mbere, HPMC ishongeshwa mu kintu cy’umwimerere (nk’ikinyobwa ethanol), hanyuma amazi yongerwamo buhoro buhoro kugira ngo ayihinduremo umuti w’amazi. Ubu buryo bukwiriye gukoreshwa mu buryo bwihariye bufite ibisabwa byinshi byo gushonga.
Imyitozo yo gusesagura mu bikorwa bifatika
Mu bikorwa bifatika, inzira yo gusenya HPMC igomba kunozwa hakurikijwe ikoreshwa ryayo. Urugero, mu rwego rw'imiti, ubusanzwe ni ngombwa gukora umuti wa colloidal uhuye kandi uhamye, kandi kugenzura neza ubushyuhe na pH birakenewe kugira ngo umuti urusheho kuba mwiza n'imikorere yawo. Mu bikoresho by'ubwubatsi, gushonga kwa HPMC bigira ingaruka ku miterere y'imashini zikora filime n'imbaraga zo gukanda, bityo uburyo bwiza bwo gusenya bugomba gutoranywa hamwe n'imiterere yihariye y'ibidukikije.
Uburyo HPMC ishonga mu mazi buterwa n'ibintu byinshi, cyane cyane ubushyuhe na pH. Muri rusange, HPMC ishonga vuba iyo ubushyuhe buri hejuru (60-80°C), ariko ishobora kwangirika cyangwa ikagabanuka mu gihe pH ikabije. Kubwibyo, mu bikorwa bifatika, ni ngombwa guhitamo ubushyuhe bukwiye bwo gushonga n'urugero rwa pH hakurikijwe ikoreshwa ryihariye n'ibidukikije bya HPMC kugira ngo ishobore gushonga neza kandi ikore neza.
Igihe cyo kohereza: Kamena-25-2024