MC ke methyl cellulose, e fumanoang ka ho phekola k'hothone e hloekisitsoeng ka alkali, ho sebelisa methyl chloride e le etherifying agent, le ho etsa cellulose ether ka 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) Ho boloka metsi amethyl celluloseho ipapisitse le palo ea eona ea tlatsetso, viscosity, botle ba likaroloana le sekhahla sa ho qhibiliha. Ka kakaretso, haeba palo ea ho eketsa e le khōlō, botle bo nyenyane, 'me viscosity e kholo, tekanyo ea ho boloka metsi e phahame. Har'a bona, palo ea ho eketsoa e na le tšusumetso e kholo ka tekanyo ea ho boloka metsi, 'me boemo ba viscosity ha bo lekane 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.
(2) Methylcellulose e qhibiliha ka metsing a batang, empa ho thata ho qhibiliha metsing a chesang, 'me tharollo ea eona ea metsi e tsitsitse haholo ka 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, ketsahalo ea gelation e etsahala.
(3) Phetoho ea mocheso e tla ama ka botebo sekhahla sa ho boloka metsi sa methyl cellulose. Ka kakaretso, ha thempereichara e phahame, ho mpefala ha metsi ho boloka metsi. Haeba mocheso oa seretse o feta 40 ° C, ho bolokoa ha metsi a methyl cellulose ho tla mpefala haholo, e leng se tla ama ka botebo ho sebetsa ha seretse.
(4) Methyl cellulose e na le phello e kholo ho sebetsa le ho khomarela seretse. "Ho khomarela" mona ho bolela ho khomarela ho utluoa pakeng tsa sesebelisoa sa mosebetsi le karoloana ea lebota, ke hore, ho hanyetsa ho kuta ha seretse. Sekhomaretsi se seholo, ho hanyetsa ha seretse sa seretse se seholo, 'me matla a hlokoang ke basebetsi ts'ebetsong ea tšebeliso e boetse e le khōlō,' me kaho ea seretse e futsanehile. Methylcellulose adhesion e boemong bo itekanetseng lihlahisoa tsa ether tsa cellulose.
HPMC ke hydroxypropyl methyl cellulose, e leng selulose e seng ionic e tsoakiloeng ka k'hothone e hloekisitsoeng ka mor'a phekolo ea alkali, e sebelisa propylene oxide le methyl chloride e le etherifying agents, le ka letoto la liketso. Tekanyo ea ho fetola hangata ke 1.2 ho 2.0. Thepa ea eona e fapana ho latela karolo ea methoxyl le dikahare tsa hydroxypropyl.
(1) Hydroxypropyl methylcellulose e qhibiliha habonolo metsing a batang, empa 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 ka metsing a batang ho boetse ho ntlafala haholo ha ho bapisoa le methyl cellulose.
(2) The viscosity ea hydroxypropyl methylcellulose e amana le boholo ba boima ba eona ba molek'hule, 'me boima ba molek'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. Empa viscosity ea eona ha e amehe haholo ke mocheso o phahameng ho feta methyl cellulose. Tharollo ea eona e tsitsitse ho boloka mocheso oa kamore.
(3) Hydroxypropyl methylcellulose e tsitsitse ho acid le alkali, 'me tharollo ea eona ea metsi e tsitsitse haholo ka har'a pH = 2 ~ 12. Caustic soda le metsi a lime ha li na phello e fokolang mosebetsing oa eona, empa alkali e ka potlakisa ho qhibiliha ha eona le ho eketsa viscosity. Hydroxypropyl methylcellulose e tsitsitse ho matsoai a tloaelehileng, empa ha motsoako oa motsoako oa letsoai o phahame, viscosity ea tharollo ea hydroxypropyl methylcellulose e atisa ho eketseha.
(4) Ho boloka metsi ahydroxypropyl methylcellulosee itšetlehile ka palo ea eona ea ho eketsa, viscosity, joalo-joalo Sekhahla sa ho boloka metsi tlas'a chelete e tšoanang ea ho eketsa e phahame ho feta ea methyl cellulose.
(5) Hydroxypropyl methylcellulose e ka kopanngoa le metsoako ea polymer e qhibilihang ka metsing ho etsa tharollo e nang le junifomo le viscosity e phahameng. Joalo ka joala ba polyvinyl, starch ether, boka ba meroho, joalo-joalo.
(6) Ho khomarela ha hydroxypropyl methylcellulose mohahong oa seretse ho phahame ho feta methylcellulose.
(7) Hydroxypropyl methylcellulose e na le khanyetso e ntle ho li-enzyme ho feta methylcellulose, 'me monyetla oa ho senyeha ha eona oa enzymatic o tlase ho feta oa methylcellulose.
Nako ea poso: Apr-28-2024