Izina ry'igishinwa rya HPMC ni hydroxypropyl methylcellulose. Ntabwo ari ionic kandi ikunze gukoreshwa nk'ikintu kibungabunga amazi mu gishishwa cyumye. Ni cyo gikoreshwa cyane mu gukungabunga amazi mu gishishwa.
Uburyo bwo gukora HPMC ahanini ni umusaruro wa eteri ushingiye kuri polysaccharide ukorwa binyuze mu kugabanya no gusya ipamba (ipamba). Nta shariji ifite ubwayo, ntabwo ihura n'iyoni zishyushye mu bikoresho bya gelling, kandi ifite imikorere ihamye. Igiciro kandi kiri hasi ugereranyije n'ubundi bwoko bwa eteri za cellulose, bityo ikoreshwa cyane mu bintu byumye bivanze.
Imikorere ya hydroxypropyl methylcellulose: Ishobora gukurura mortilla nshya ivanze kugira ngo igire ubushyuhe runaka butose kandi irinde gutandukana. (Kubyimba) Kubika amazi ni nabyo biranga ingenzi cyane, bifasha kugumana amazi menshi muri mortilla, ku buryo nyuma yo kubaka mortilla, ibikoresho bitera sima bigira umwanya uhagije wo kuhira. (Kubika amazi) Ifite ubushobozi bwo gushyira umwuka mu kirere, ishobora gushyiramo utubumbe tw’umwuka duto kandi duto kugira ngo inoze imiterere ya mortilla.
Uko eteri ya hydroxypropyl methylcellulose irushaho kuba nziza, niko imikorere yayo irushaho kuba myiza. Ubukana ni ikintu cy'ingenzi mu mikorere ya HPMC. Muri iki gihe, abakora HPMC batandukanye bakoresha uburyo butandukanye n'ibikoresho bitandukanye kugira ngo bapime ubukana bwa HPMC. Uburyo bw'ingenzi ni HaakeRotovisko, Hoppler, Ubbelohde na Brookfield.
Ku gicuruzwa kimwe, ibisubizo bya viscosity bipimwe hakoreshejwe uburyo butandukanye biratandukanye cyane, ndetse bimwe bifite itandukaniro rya kabiri. Kubwibyo, iyo ugereranije viscosity, bigomba gukorwa hagati yuburyo bumwe bwo gupima, harimo ubushyuhe, rotor, nibindi. Ku bijyanye n'ingano y'uduce, uko agace gato karushaho kuba gato, niko amazi arushaho kugumana neza. Nyuma y'uko uduce tunini twa eteri ya cellulose tugera mu mazi, ubuso buhita bushonga bugakora gel yo gupfunyika ibikoresho kugira ngo hirindwe ko molekile z'amazi zikomeza kwinjira. Hari igihe ntashobora gukwirakwira no gushonga kimwe ndetse no nyuma yo kuvanga igihe kirekire, bigatuma habaho umuti w'ibicu cyangwa agglomeration. Bigira ingaruka zikomeye ku kubika amazi kwa eteri ya cellulose, kandi gushonga ni kimwe mu bintu bituma umuntu ahitamo eteri ya cellulose.
Ubutonyanga ni ikimenyetso cy'ingenzi cy'imikorere ya eteri ya methyl cellulose. MC ikoreshwa mu ifu yumye isabwa kuba ifu, ifite amazi make, kandi ubutonyanga busaba ko 20% ~ 60% by'ingano y'uduce tuba munsi ya 63um. Ubutonyanga bugira ingaruka ku gushonga kwa eteri ya hydroxypropyl methylcellulose. MC isanzwe iba ifite uduce duto, kandi byoroshye gushonga mu mazi nta guhurirana, ariko igipimo cyo gushonga kiba gito cyane, bityo ntikwiriye gukoreshwa mu ifu yumye.
Mu ifu yumye, MC ikwirakwizwa mu bikoresho byo gusima nka aggregate, fine filler na sima, kandi ifu nziza ihagije ni yo ishobora kwirinda methyl cellulose ether agglomeration iyo ivanze n'amazi. Iyo MC yongewemo amazi kugira ngo ishongeshe agglomerate, biragoye cyane kuyitatanya no kuyishongesha. Ubutoshye bwa MC ntibupfa ubusa gusa, ahubwo bunagabanya imbaraga za molt. Iyo ifu yumye nk'iyo ikoreshejwe ahantu hanini, umuvuduko wo kuyitobora wa molt yumye yo mu gace uzagabanuka cyane, kandi imyenge izagaragara bitewe n'ibihe bitandukanye byo kuyitobora. Ku ifu ifashishijwe imashini, ibisabwa kugira ngo ibe nziza ni byinshi bitewe n'igihe gito cyo kuyivanga. Muri rusange, uko viscosity iba nyinshi, niko ingaruka zo kubika amazi ziba nziza. Ariko, uko viscosity iba nyinshi kandi uburemere bwa molekile ya MC bukaba bwinshi, kugabanuka kwabyo mu gushonga bizagira ingaruka mbi ku mbaraga n'imikorere y'ubwubatsi bwa molt.
Uko ubushyuhe bwinshi burushaho kwiyongera, ni ko ingaruka zo gukomera ku gishishwa zigaragara, ariko ntabwo bingana neza. Uko ubushyuhe bwinshi burushaho kwiyongera, ni ko igishishwa gitose kirushaho kuba kinini, ni ukuvuga mu gihe cyo kubaka, kigaragara nk'aho gifata ku gishishwa kandi gifatana cyane n'icyatsi. Ariko ntabwo ari byiza kongera imbaraga z'imiterere ya gishishwa gitose ubwacyo. Ni ukuvuga ko mu gihe cyo kubaka, imikorere yo kurwanya gucika ntigaragara. Ahubwo, zimwe muri eteri za methyl cellulose zimeze nk'ubushyuhe buri hagati n'ubuke ariko zahinduwe zifite imikorere myiza mu kunoza imbaraga z'imiterere ya gishishwa gitose.
Uburyo amazi abikwamo na HPMC bufitanye isano n'ubushyuhe bukoreshwa, kandi uburyo amazi abikwamo na methyl cellulose ether bugabanuka uko ubushyuhe bwiyongera. Ariko, mu bikoresho nyabyo, ifu yumye ikunze gushyirwa ku bintu bishyushye ku bushyuhe bwinshi (buri hejuru ya dogere 40) mu bintu byinshi, nko gusiga ifu yo hanze ku rukuta munsi y'izuba mu mpeshyi, akenshi bihutisha Gutunganya sima no gukomera kwa sima yumye. Kugabanuka k'umuvuduko wo kubika amazi bitera kumva ko ubushobozi bwo gukora no kudakora neza bizagira ingaruka, kandi ni ngombwa cyane kugabanya ingaruka z'ubushyuhe muri iki kibazo.
Muri urwo rwego, inyongera za methyl hydroxyethyl cellulose ether ubu zifatwa nk'iza mbere mu iterambere ry'ikoranabuhanga. Nubwo ingano ya methyl hydroxyethyl cellulose yiyongera (formula yo mu mpeshyi), ubushobozi bwo gukora no kudakora neza ntibishobora guhaza ibyifuzo by'ikoreshwa. Binyuze mu buryo bwihariye bwo kuvura MC, nko kongera urugero rwa etherification, n'ibindi, ingaruka zo kubika amazi zishobora kuguma ku bushyuhe bwinshi, kugira ngo ibashe gutanga umusaruro mwiza mu bihe bikomeye.
Igipimo cya HPMC ntikigomba kuba kinini cyane, bitabaye ibyo byongera ubwinshi bw'amazi ya mortiweri, izafatana n'umugozi, kandi igihe cyo gushyiraho kizaba kirekire cyane, ibyo bizagira ingaruka ku buryo bwo gukora. Ibikoresho bitandukanye bya mortiweri bikoresha HPMC bifite ubukana butandukanye, kandi ntibikoresha HPMC ifite ubukana bwinshi mu buryo busanzwe. Kubwibyo, nubwo ibicuruzwa bya hydroxypropyl methylcellulose ari byiza, birashimwa iyo bikoreshejwe neza. Guhitamo HPMC ikwiye ni inshingano y'ibanze y'abakozi ba laboratwari. Muri iki gihe, abacuruzi benshi b'abatekamutwe barimo kongera HPMC, kandi ubwiza ni bubi cyane. Mu guhitamo cellulose runaka, laboratwari igomba gukora akazi keza mu igerageza kugira ngo irebe ko ibicuruzwa bya mortiweri bihamye, kandi ntigomba kurarikira amafaranga make ngo biteze igihombo kidakenewe.
Igihe cyo kohereza: Gicurasi-04-2023