Niki Hydroxypropyl Methylcellulose Yakozwe

Hydroxypropyl methylcellulose (HPMC) ni polymer semisintetike ikoreshwa mu nganda zitandukanye, zirimo ubwubatsi, ibiryo, imiti, n’ibicuruzwa byita ku muntu. Ihabwa agaciro kubushobozi bwayo bwo kunoza imiterere yimiterere yimiterere, kimwe no guhuza nibindi bikoresho hamwe nuburozi bwayo buke. Kugira ngo wumve uko HPMC ikorwa, ni ngombwa kubanza kumva imiterere n'imiterere ya selile.

Cellulose ni urunigi rurerure rwa molekile ya glucose iboneka mu rukuta rw'utugingo ngengabuzima. Molekile ya glucose ihujwe na beta-1,4-glycosidic, ikora urunigi. Iminyururu noneho ifatanyirizwa hamwe hamwe na hydrogène hamwe na Van der Waals imbaraga zo gukora ibintu bikomeye, fibrous. Cellulose ni uruganda rwinshi cyane ku isi, kandi rukoreshwa muburyo butandukanye, harimo impapuro, imyenda, nibikoresho byubaka.

Mugihe selile ifite ibintu byinshi byingirakamaro, akenshi birakomeye kandi ntibishobora gukoreshwa muburyo bwinshi. Kugira ngo ibyo bibazo bigabanuke, abahanga bakoze ibintu byinshi byahinduwe na selile, harimo HPMC. HPMC ikorwa muguhindura selile karemano binyuze murukurikirane rwimiti.

Intambwe yambere mugukora HPMC nukubona selile yo gutangira ibikoresho. Ibi birashobora gukorwa mugukuramo selile mumasoko y'ibimera nk'ibiti by'ibiti, ipamba, cyangwa imigano. Cellulose noneho ivurwa hakoreshejwe igisubizo cya alkaline, nka hydroxide ya sodium cyangwa potasiyumu hydroxide, kugirango ikureho umwanda kandi ivunagure fibre selile mubice bito. Iyi nzira izwi nka mercerisation, kandi ituma selile ikora cyane kandi byoroshye guhindura.

Nyuma ya mercerisation, selile ikorwa hamwe nuruvange rwa oxyde ya propylene na methyl chloride kugirango itangize hydroxypropyl na methyl mumatsinda ya selile. Amatsinda ya hydroxypropyl yongeweho kugirango atezimbere kandi agumane amazi ya selile, mugihe amatsinda ya methyl yongeweho kugirango yongere ituze kandi agabanye reaction ya selile. Ubusanzwe reaction ikorwa imbere ya catalizator, nka hydroxide ya sodium cyangwa hydroxide ya potasiyumu, kandi mugihe cyubushyuhe bwubushyuhe, umuvuduko, nigihe cyo kubyitwaramo.

Urwego rwo gusimbuza (DS) rwa HPMC bivuga umubare wa hydroxypropyl na methyl matsinda yinjizwa mumugongo wa selile. DS irashobora gutandukana bitewe nibintu byifuzwa bya HPMC hamwe na progaramu yihariye ikoreshwa. Mubisanzwe, indangagaciro za DS zitera HPMC hamwe nubwiza buke nigipimo cyihuta cyo guseswa, mugihe indangagaciro za DS zituma HPMC ifite ubukonje bwinshi nigipimo cyo gusesa buhoro.

Nyuma yo kubyitwaramo birangiye, ibicuruzwa bivamo birasukurwa kandi byumishwa kugirango habeho ifu ya HPMC. Igikorwa cyo kweza gikubiyemo kuvana imiti iyo ari yo yose idakozwe, imiti isigaye, n’indi myanda muri HPMC. Ibi mubisanzwe bikorwa binyuze murwego rwo gukaraba, kuyungurura, no gukama intambwe.

Igicuruzwa cyanyuma ni ifu yera-yera ifu idafite impumuro nziza kandi itaryoshye. HPMC irashobora gushonga mumazi hamwe nudukoko twinshi twinshi, kandi irashobora gukora geles, firime, nibindi bikoresho bitewe nuburyo ikoreshwa. Ni polymer itari ionic, bivuze ko idatwara umuriro w'amashanyarazi, kandi mubisanzwe ifatwa nkuburozi kandi ifite umutekano kugirango ikoreshwe muburyo butandukanye.

HPMC ikoreshwa muburyo butandukanye, harimo amarangi, ibifatika, kashe, imiti, nibiribwa. Mubikorwa byubwubatsi, HPMC ikoreshwa kenshi mubyimbye, binder, na firime-yahoze mubicuruzwa bya sima na gypsumu, nka minisiteri, grout, hamwe nuruvange.