HPMC ke eng?MC ke eng?

HPMC ke hydroxypropyl methylcellulose, e leng selulose e seng ionic e tsoakiloeng ka k'hothone e hloekisitsoeng ka mor'a alkalization, e sebelisa propylene oxide le methyl chloride e le li-etherification agents, le ka letoto la liketso.Tekanyo ea ho nka sebaka ka kakaretso ke 1.2 ~ 2.0.Thepa ea eona e fapane ka lebaka la likarohano tse fapaneng tsa litaba tsa methoxyl le litaba tsa hydroxypropyl.

MC ke methyl cellulose, e entsoeng ka cellulose ether ka ho phekola k'hothone e hloekisitsoeng ka alkali, ho sebelisa methane chloride e le etherification agent, le ho latela letoto la liketso.Ka kakaretso, tekanyo ea ho fetola ke 1.6 ~ 2.0, 'me solubility e boetse e fapane le likhato tse fapaneng tsa ho fetola.Ke ea non-ionic cellulose ether.

(1) Hydroxypropyl methylcellulose e qhibiliha habonolo metsing a batang, 'me e tla kopana le mathata a ho qhibiliha metsing a chesang.Empa mocheso oa eona oa gelation metsing a chesang o phahame haholo ho feta oa methyl cellulose.Ho qhibiliha ha metsi a batang ho boetse ho ntlafala haholo ha ho bapisoa le methyl cellulose.Hydroxypropyl methylcellulose e tsitsitse ho acid le alkali, 'me tharollo ea eona ea metsi e tsitsitse haholo ka pH = 2 ~ 12.Caustic soda le metsi a lime ha li na phello e fokolang ts'ebetsong ea eona, empa alkali e ka potlakisa ho qhibiliha ha eona le ho eketsa viscosity ea eona.Hydroxypropyl methylcellulose e tsitsitse ho matsoai a tloaelehileng, empa ha motsoako oa motsoako oa letsoai o phahame, viscosity ea hydroxypropyl methylcellulose tharollo e atisa ho eketseha.

Methylcellulose e boetse e qhibiliha ka metsing a batang, 'me ho tla ba thata ho qhibiliha ka metsing a chesang.Tharollo ea eona ea metsi e tsitsitse haholo maemong a pH = 3 ~ 12.E na le tumellano e ntle le starch, guar gum, joalo-joalo le li-surfactants tse ngata.Ha mocheso o fihla mocheso oa gelation, gelation e etsahala.

(2) Viscosity ea hydroxypropyl methylcellulose e amana le boima ba eona ba molek'hule, 'me boima ba limolek'hule bo boholo, ho ba le viscosity e phahameng.Mocheso o boetse o ama viscosity ea eona, ha mocheso o ntse o eketseha, viscosity e fokotseha.Leha ho le joalo, viscosity ea eona e phahameng e na le phello e tlase ea mocheso ho feta methyl cellulose.Tharollo ea eona e tsitsitse ha e bolokiloe mocheso oa kamore.

Methylcellulose e na le phello e kholo ho sebetsa le ho khomarela seretse."Ho khomarela" mona ho bolela matla a sekhomaretsi a utluoang pakeng tsa sesebelisoa sa mosebetsi le karoloana ea lebota, ke hore, ho hanyetsa ha seretse.Sekhomaretsi se phahame, khanyetso ea ho kuta ea seretse e kholo, 'me matla a hlokoang ke basebetsi ha a ntse a sebelisoa le ona a maholo,' me ts'ebetso ea kaho ea seretse e futsanehile.Methyl cellulose adhesion e boemong bo itekanetseng lihlahisoa tsa cellulose ether.

(3) Ho bolokoa ha metsi a hydroxypropyl methylcellulose ho itšetlehile ka palo ea eona ea tlatsetso, viscosity, joalo-joalo, 'me sekhahla sa eona sa ho boloka metsi tlas'a chelete e tšoanang ea tlatsetso e phahame ho feta ea methyl cellulose.

Ho boloka metsi a methylcellulose ho ipapisitse le palo ea eona ea tlatsetso, viscosity, botle ba likaroloana le sekhahla sa ho qhibiliha.Ka kakaretso, haeba chelete ea tlatsetso e le kholo, botle bo nyane, 'me viscosity e kholo, sekhahla sa ho boloka metsi se phahame.Har'a bona, palo ea ho eketsoa e na le tšusumetso e kholo ka ho fetisisa ho tekanyo ea ho boloka metsi, 'me boemo ba viscosity ha bo lekane ka ho toba le tekanyo ea ho boloka metsi.Sekhahla sa ho qhibiliha haholo-holo se itšetlehile ka tekanyo ea phetoho ea bokaholimo ba likaroloana tsa cellulose le botle ba likaroloana.Har'a li-ether tsa cellulose tse ka holimo, methyl cellulose le hydroxypropyl methyl cellulose li na le litekanyetso tse phahameng tsa ho boloka metsi.

(4) Hydroxypropyl methylcellulose e ka kopanngoa le metsoako ea polymer e qhibilihang ka metsing ho etsa tharollo e tšoanang le e phahameng ea viscosity.Tse kang joala ba polyvinyl, starch ether, gum ea meroho, joalo-joalo Ho khomarela ha hydroxypropyl methylcellulose mohahong oa seretse ho phahame ho feta methylcellulose.

Hydroxypropyl methylcelluloseHPMCe na le khanyetso e ntle ea enzyme ho feta methylcellulose, 'me tharollo ea eona ha e na monyetla oa ho senngoa ke li-enzyme ho feta methylcellulose.

Liphetoho tsa mocheso li ka ama haholo ho boloka metsi a methyl cellulose.Ka kakaretso, ha thempereichara e phahame, ho mpefala ha metsi ho boloka metsi.Haeba mocheso oa seretse o feta 40 ° C, ho boloka metsi a methyl cellulose ho tla fokotseha haholo, ho ama ka ho teba ho hahoa ha seretse.Ha mocheso o batla o phahame, leka ho khetha hydroxypropyl methylcellulose.