Hydroxypropyl methyl cellulose (HPMC), thepa e talaselulose, e ka ba k'hothone e hloekisitsoeng kapa makhasi a lehong.Hoa hlokahala ho e phunya pele kapa nakong ea ts'ebetso ea alkalization.Pulverization e etsoa ka matla a mochini.Senya sebopeho se kopaneng sa lisebelisoa tse tala tsa cellulose ho fokotsa crystallinity le polymerization degree le ho eketsa sebaka sa eona sa holimo, ka hona ho ntlafatsa phihlello le bokhoni ba karabelo ea lik'hemik'hale ea li-reagents ho lihlopha tse tharo tsa hydroxyl ho cellulose macromolecular glucose ring base.
Hydroxypropyl methyl cellulose (HPMC)e sebelisoa e le karoloana ea thepa e tala ho hlahisa oli, e ka hlokomelang ts'ebeliso ea tsoekere e felletseng, ea ntlafatsa sekhahla sa ts'ebeliso ea lisebelisoa tse tala, ea fokotsa palo e setseng ea substrate ka har'a moro o belisoang, le ho fokotsa litšenyehelo tsa ho hloekisa metsi a litšila.Litšobotsi tsamethyl celluloseli thusa ho ntlafatseng batch, fed-batch le mekhoa e tsoelang pele ea ho belisoa, ho qoba letoto la mathata a kang ho laola sebopeho sa sehare le sekhahla sa ho hlapolla;ka nako e ts'oanang, e boetse e thusa ho laola mokhoa oa ho belisa.Hobane thepa eahydroxypropyl methyl cellulose (HPMC)li tšoana le li-ethers tse ling tse qhibilihang ka metsing, e ka sebelisoa e le moemeli oa ho etsa filimi, thickener, emulsifier le stabilizer ka liaparo tsa latex le likaroloana tsa ho roala ka metsi, ho etsa hore ho khonehe ho etsa liaparo Filimi e na le khanyetso e ntle ea abrasion, e leka-lekaneng. thepa le ho khomarela, 'me e ntlafalitse tsitsipano ea holim'a metsi, botsitso ho acid le alkali, le ho lumellana le li-pigments tsa tšepe.
Hydroxypropyl methyl cellulose (HPMC)e na le phello e ntle e le motenya bakeng sa liaparo tse tšoeu tsa polyvinyl acetate tse entsoeng ka metsi.Tekanyo ea ho nka sebaka sacellulose etherea eketseha, 'me ho hanyetsa libaktheria le khoholeho ea mobu le tsona lia ntlafatsoa.
Leha molao-motheo oa etherification synthesis ea hydroxypropyl methylcellulose (HPMC) o sa rarahane, ke alkalization, ho sila lintho tse tala, le alkalization.Libaka tse fapa-fapaneng tsa etherification, ho hlaphoheloa ha solvent, karohano ea centrifugal, ho hlatsoa le ho omisa ho kenyelletsa palo e kholo ea theknoloji ea bohlokoa le tsebo e ruileng.
Bakeng sa mefuta e fapaneng ea lihlahisoa, tikoloho ka 'ngoe e na le maemo a morao-rao a taolo, joalo ka mocheso, nako, khatello le taolo ea phallo ea thepa.Lisebelisoa tse thusang le lisebelisoa tsa ho laola ke tiiso e ka tšeptjoang le e molemo bakeng sa boleng bo tsitsitseng ba sehlahisoa le tsamaiso e ka tšeptjoang ea tlhahiso.
Litšobotsi tsa sehlahisoa sahydroxypropyl methyl cellulose:
1. Thepa: Sehlahisoa sena ke phofo e tšoeu, 'me ha se na monko, ha se latsoehe ebile ha se chefo.
2. Tšusumetso ea ho boloka metsi: Hobane sehlahisoa sena se ka monya metsi ka makhetlo a 'maloa ho feta ka boeona.Boloka ho boloka metsi a mangata seretseng, gypsum, pente le lihlahisoa tse ling.
3. Sehlahisoa sena se ka qhibiliha ka metsing a batang ho etsa mokelikeli o hlakileng oa viscous.
4. Ho qhibiliha ka har'a li-solvents: Kaha e na le palo e itseng ea liphatsa tsa lefutso tsa hydrophobic, sehlahisoa sena se ka qhibiliha ka har'a metsoako e meng ea tlhaho, 'me se ka boela sa qhibiliha ka metsoako e tsoakiloeng ea metsi le lintho tse phelang.
5. Ho hanyetsa letsoai: Kaha sehlahisoa sena ke se seng sa ionic le se seng sa polyelectrolyte, se batla se tsitsitse ka tharollo ea metsi a letsoai la tšepe kapa li-electrolyte tsa organic.Tabeng ea electrolyte e ngata haholo, e ka 'na ea baka gelation kapa pula.
6. Ts'ebetso ea bokaholimo: Tharollo e nang le metsi ea sehlahisoa sena e na le ts'ebetso e kaholimo.
Nako ea poso: Nov-29-2021