1.Hydroxypropyl methyl cellulose
Hydroxypropyl methylcelluloseke mofuta oa cellulose oo tlhahiso le tšebeliso ea tsona li ntseng li eketseha ka potlako. Ke selulose e seng ionic e tsoakiloeng e entsoeng ka k'hothone e hloekisitsoeng ka mor'a alkalization, e sebelisa propylene oxide le methyl chloride e le etherification agent, ka letoto la liketso. Tekanyo ea ho nka sebaka ka kakaretso ke 1.2 ~ 2.0. Thepa ea eona e fapana ho latela karolelano ea methoxyl ho hydroxypropyl content.
(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.
(2) (2) The viscosity ea hydroxypropyl methylcellulose e amana le boima ba eona ba molek'hule, 'me boima ba limolek'hule bo boholo, bo phahametse viscosity. Mocheso o boetse o ama viscosity ea eona, ha mocheso o ntse o eketseha, viscosity e fokotseha. Leha ho le joalo, tšusumetso ea viscosity ea eona e phahameng le mocheso o tlase ho feta oa methyl cellulose. Tharollo ea eona e tsitsitse ha e bolokiloe mocheso oa kamore.
(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.
(4) 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 ts'ebetsong ea eona, empa alkali e ka potlakisa sekhahla sa ho qhibiliha 'me ea eketsa viscosity ea eona hanyenyane. 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.
(5) Hydroxypropyl methylcellulose e ka kopanngoa le li-polymers tse qhibilihang ka metsing ho etsa tharollo ea homogeneous, e phahameng-viscosity. Joalo ka joala ba polyvinyl, starch ether, boka ba meroho, joalo-joalo.
(6) Hydroxypropyl methylcellulose e na le khanyetso e ntle ea enzyme ho feta methylcellulose, 'me tharollo ea eona ha e na monyetla oa ho senyeha ka li-enzyme ho feta methylcellulose.
(7) Ho khomarela ha hydroxypropyl methylcellulose mohahong oa seretse ho phahame ho feta methylcellulose.
2. Hydroxyethyl cellulose
E entsoe ka k'hothone e hloekisitsoeng e tšoaroang ka alkali, 'me e itšoara ka ethylene oxide e le moemeli oa etherification ka pel'a isopropanol. Tekanyo ea eona ea ho fetola hangata ke 1.5 ~ 2.0. E na le hydrophilicity e matla 'me e bonolo ho monya mongobo.
(1) Hydroxyethyl cellulose e qhibiliha ka metsing a batang, empa ho thata ho qhibiliha ka metsing a chesang. Tharollo ea eona e tsitsitse mocheso o phahameng ntle le gelling. E ka sebelisoa nako e telele tlas'a mocheso o phahameng ka har'a seretse, empa ho boloka metsi a eona ho tlaase ho feta methyl cellulose.
(2)Hydroxyethyl cellulosee tsitsitse ho acid e akaretsang le alkali, 'me alkali e ka potlakisa ho qhibiliha ha eona' me ea eketsa viscosity hanyenyane. Ho qhalana ha eona metsing ho mpe ho feta ea methyl cellulose le hydroxypropyl methyl cellulose.
(3) Hydroxyethyl cellulose e na le ts'ebetso e ntle ea anti-sag bakeng sa seretse, empa e na le nako e telele ea ho chechisa samente.
(4) Ts'ebetso ea hydroxyethyl cellulose e hlahisoang ke likhoebo tse ling tsa malapeng ho hlakile hore e tlase ho feta ea methyl cellulose ka lebaka la metsi a mangata le molora o mongata.
(5) Mofuta oa mokelikeli o nang le metsi oa hydroxyethyl cellulose o batla o le kotsi. Ka mocheso oa hoo e ka bang 40 ° C, hlobo e ka 'na ea hlaha ka hare ho matsatsi a 3 ho isa ho a 5, e leng se tla ama ts'ebetso ea eona.
Nako ea poso: Apr-28-2024