Mokhoa oa ho lekola viscosity ea hydroxypropyl methylcellulose?

Hydroxypropyl methylcellulose bakeng sa kaho e hloka ho qoba ho kenella ha metsi leboteng, 'me ho bolokoa ha metsi a lekaneng ka har'a seretse ho ka etsa hore samente e hlahise ts'ebetso e ntle ea metsi le metsi ka botlalo. Hydroxypropyl methylcellulose Viscosity ea selulose seretseng e lekana ka kotloloho, ha viscosity e phahame, ho boloka metsi a hydroxypropyl methylcellulose ho betere.

Hang ha mongobo oa hydroxypropyl methylcellulose o phahame haholo, ho boloka metsi a hydroxypropyl methylcellulose ho tla fokotseha, e leng ho tla lebisa ka ho toba ho fokotseha ha katleho ea kaho ea hydroxypropyl methylcellulose. Re boetse re tloaelane le lintho tse ka ’nang tsa etsa liphoso. Re lokela ho lula re e boloka e le ncha 'me re tla fumana liphello tse sa lebelloang.

Viscosity e bonahalang ke sesupo sa bohlokoa sa hydroxypropyl methylcellulose. Mekhoa e tloaelehileng ea ho etsa qeto ke rotational viscometry, capillary viscometry le viscometry ea hoetla.

Nakong e fetileng, mokhoa oa ho etsa qeto ea hydroxypropyl methylcellulose e ne e le capillary viscometry, o sebelisa viscometer ea Ubbelohde. Hangata tharollo ea boikemisetso ke tharollo ea metsi ea 2, 'me foromo ke: V=Kdt. V e emela viscosity, yuniti ke , K ke kamehla ea viscometer, d e emela letsoalo mocheso o sa khaotseng, t e bolela nako ho tloha holimo ho ea tlaase ka viscometer, yuniti ke ea bobeli s. Mokhoa ona o batla o le boima ho sebetsa, 'me haeba ho na le lintho tse sa tsitsang, ho bonolo ho baka liphoso,' me ho thata ho khetholla boleng ba hydroxypropyl methylcellulose.

Bothata ba delamination ea sekhomaretsi sa kaho ke bothata bo boholo boo bareki ba kopanang le bona. Pele ho tsohle, bothata ba lisebelisoa tse tala bo lokela ho nahanoa ka delamination ea sekhomaretsi sa kaho. Lebaka le ka sehloohong la delamination ea sekhomaretsi sa kaho ke joala ba polyvinyl (PVA) le hydroxypropyl methylcellulose (HPMC). e bakoang ke ho se dumellane. Ea bobeli, ke hobane nako ea ho sisinyeha ha ea lekana; ho phaella moo, ts'ebetso e teteaneng ea sekhomaretsi sa kaho ha e ntle.

Sekhomaretsing sa kaho, instant hydroxypropyl methylcellulose (HPMC) e tlameha ho sebelisoa, hobane hydroxypropyl methylcellulose (HPMC) e qhalakanngoa feela metsing ntle le ho qhibiliha ha 'nete. Hoo e ka bang metsotso e 2, viscosity ea mokelikeli e ntse e eketseha butle-butle, e etsa "viscous colloid" e hlakileng.

Lihlahisoa tse chesang, ha li kopane le metsi a batang, li ka qhalana ka potlako metsing a chesang 'me tsa nyamela metsing a chesang. Ha mocheso o theohela ho mocheso o itseng, viscosity e tla hlaha butle-butle ho fihlela e etsa "viscous colloid" e hlakileng. Palo e khothaletsoang ea hydroxypropyl methylcellulose (HPMC) e kentsoeng sekhomaretsing sa kaho ke 2-4kg.

Hydroxypropyl methylcellulose (HPMC) e na le metsoako e tsitsitseng ea lik'hemik'hale, ho hanyetsa hlobo, le ho boloka metsi hantle ka har'a sekhomaretsi sa kaho, 'me ha e amehe ke liphetoho tsa boleng ba pH. E ka sebelisoa ka viscosity ho tloha ho 100,000 S ho ea ho 200,000 S. Empa tlhahisong, ho phahama ha viscosity, ho molemo. The viscosity ke inversely tekano le matla a tlamo. Ha viscosity e phahame, matla a manyenyane. Ka kakaretso, viscosity ea 100,000 S e loketse.