Focus on Cellulose ethers

Cellulose ether seretseng sa ho ikemela

Cellulose ether ke lentsoe le akaretsang bakeng sa letoto la lihlahisoa tse hlahisoang ke karabelo ea alkali cellulose le etherifying agent tlasa maemo a itseng. Alkali cellulose e nkeloa sebaka ke li-etherifying agents tse fapaneng ho fumana tse fapanengli-cellulose ethers. Ho latela thepa ea ionization ea li-substituent, cellulose ethers e ka aroloa ka mekhahlelo e 'meli: ionic (joalo ka carboxymethyl cellulose) le non-ionic (joalo ka methyl cellulose). Ho latela mofuta oa substituent, cellulose ether e ka aroloa ka monoether (joalo ka methyl cellulose) le ether e tsoakiloeng (joalo ka hydroxypropyl methyl cellulose). Ho ea ka solubility e fapaneng, e ka aroloa ka metsi a qhibilihang (joalo ka hydroxyethyl cellulose) le organic solvent-soluble (joalo ka ethyl cellulose), joalo-joalo. e arotsoe ka mofuta oa hang-hang le mofuta o tšoaroang ka holim'a nako e liehang ho qhibiliha.

Ka mor'a hore cellulose ether ka seretse e qhibilihe ka metsing, kabo e sebetsang le e ts'oanang ea lisebelisoa tsa samente tsamaisong e tiisitsoe ka lebaka la mosebetsi oa holim'a metsi, 'me cellulose ether, e le colloid e sireletsang, "e phuthela" likaroloana tse tiileng le likoahelo. bona bokantle bo kantle. Theha filimi ea lubricating, etsa hore tsamaiso ea seretse e be e tsitsitseng haholoanyane, hape e ntlafatse ho phalla ha seretse nakong ea ho kopanya le ho boreleli ha mohaho.

Ka lebaka la sebopeho sa eona sa limolek'hule, tharollo ea cellulose ether e etsa hore metsi a seretse a se ke a lahleheloa ke bonolo, 'me butle-butle a e lokolla ka nako e telele, e leng se etsang hore seretse se be le ho boloka metsi hantle le ho sebetsa hantle.

Seretse sa samente sa fatše se ikemetseng, se nang le viscosity e tlase ea hydroxypropyl methylcellulose ether. Kaha mobu oohle o lekanngoe ka tlhaho ka ho kenella ho fokolang ke basebetsi ba kaho, ha ho bapisoa le mokhoa o fetileng oa ho theola matsoho, ho bata le lebelo la kaho li ntlafatsoa haholo. Nako ea ho kopanya e omeletseng e nka monyetla oa ho boloka metsi a hydroxypropyl methylcellulose. Kaha ho itokisa ho hloka hore seretse se ferekantsoeng ka ho lekana se iketsetse fatše, metsi a batla a le maholo. Ka mor'a ho eketsa hpmc, e tla laola fatše Ho boloka metsi a holim'a metsi ha ho totobetse, e leng se etsang hore matla a holim'a metsi a be holimo ka mor'a ho omisa, 'me ho fokotseha ho nyane, ho fokotsang mapetsong. Ho eketsoa ha HPMC ho boetse ho fana ka viscosity, e ka sebelisoang e le thuso e khahlanong le sedimentation, ho matlafatsa metsi le ho pompa, le ho ntlafatsa katleho ea ho betla fatše.

Ether e ntle ea cellulose e na le boemo ba pono bo bobebe le bongata bo bonyenyane ba bongata; HPMC e hloekileng e na le bosoeu bo botle, lisebelisoa tse sebelisoang tlhahisong li hloekile, karabelo e nepahetse haholoanyane ebile ha e na litšila, tharollo ea metsi e hlakile, phetisetso ea leseli e phahame, 'me ha ho na ammonia, starch le joala. Tatso, fibrous tlas'a microscope kapa magnifying glass.


Nako ea poso: Dec-06-2022
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