Methylcelllllll (MC) ke kopanong ea polymer ea metsi e sebelisoang haholo lijong, meriana, lik'hemik'hale tsa letsatsi le letsatsi, kaho, indasteri e 'ngoe. Ts'ebetso ea eona ea tlhahiso e kenyelletsa mehato e mengata, haholo ho kenye ka kenyelletso ea cellulose, karabelo ea ts'ebetso, e omella le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsoa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsoa le ho sithabetsoa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsoa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsa le ho sithabetsoa le ho sithabetsa le ho sithabetsoa le ho sithabetsa le ho sithabetsa le ho sithabetsoa le ho sithabetsoa le ho sithabetsoa le ho hatella.
1. E ntšoa ka cellulose
Ntho ea mantlha ea methylcellllllllll ke celluulolese ea tlhaho, eo hangata e tsoang ho pulp ea lehong kapa k'hothone. Taba ea pele, patsi kapa k'hothone e itšireletsa likotlo tse ho tlosa litšila (joalo ka Ligrin, Redin, protheine, joalo-joalo. Mekhoa e tloaelehileng ea ho phela ka mokhoa o tloaelehileng e kenyelletsa mokhoa oa motheo oa acid-le mokhoa oa enzymatic. Mokhoa o mong oa acid-acid, pulp ea lehong e phekotsoeng ka sodium hydroxide (Naoh) kapa tharollo ea alkaline ho qhibiliha litlolo.
2. Karabelo ea Ethergation ea cellulose
Ka mor'a moo, karabelo ea kelello (karabelo ea boithati) e etsoa ho itokisetsa methylcellllllll. Mohato oa mantlha oa karabelo ea boitsebiso bo botle ke ho etsa sets'oants'o se nang le moemeli ea nang le methylating (hangata methyl clodide, methyl iodide, jj.) Ho fumana methylcelll Ts'ebetso e ikhethileng e tjena:
Khetho ea ReacTent: Solvent ea Polar kapa e Nyane) hangata e sebelisoa e le mokhoa oa ho ntlafatsa.
Maemo a karabelo: Karabelo e etsoa ka mocheso le khatello e itseng, mocheso o tloaelehileng ke 50-70 ° C. Nakong ea karabelo, methyl chloride ea methyl chlocle ea hydroxyl (--oh) molek'hule ea kamelong ea selefouna e fetoha ka ponalelose ea ho e fetola methyl.
Ts'ebetso ea karabelo: Karabelo ea methylation e hloka mokhoa oa ho lokisa o hlakileng oa nako le mocheso. Nako e telele haholo kapa mocheso o phahameng haholo o ka baka ho bolaeloa seleng ea selefoui, ha mocheso o tlase haholo o ka lebisa methyl ho se lekane, ho ama ts'ebetso ea methyl cellulose ea methyl.
3. Neatral le ho hloekisa
Kamora hore karabelo e phetheloe, ba rekiloeng ba u soma le ho tsitsipana le makhapetla a ka lula ka har'a sehlahisoa sa tšepe, se hlokang ho lula li sa nke lehlakore ebile li hloekile. Ts'ebetso ea ho se nke lehlakore hangata e sebelisa tharollo ea acidic (joalo ka tharollo ea acid acid) ho khelosa lintho tsa alkaline sehlahisoa sa maiketsetso. Ts'ebetso ea ho hloekisa e sebelisa metsi a mangata kapa joala ho tlosa li-solven, lik'hemik'hale tse sa bonahaleng le lihlahisoa tsa ka mor'a hore li netefatse sehlahisoa sa ho qetela.
4. Ho omella le ho sithabela
Kamora ho hlatsoa, methylcellluse hangata e ka ho omisoa kapa e le gel, kahoo e hloka ho omisoa ho fumana sehlahisoa se phofshoeng. Ho na le mekhoa e mengata ea ho omella, 'me hangata e sebelisoang hangata e kenyelletsa ho omisa ho omisa ho omisa, ho omisa ho omella le ho omella. Nakong ea ho omella, mocheso le mongoli o hloka ho laoloa ka kotloloho ho qoba ho bakoa ke mocheso o phahameng kapa tšenyo ea thepa ea rul.
After drying, the obtained methylcellulose needs to be crushed to achieve the required particle size. Ts'ebetso e sithabetsang hangata e phethoa ke li-sove tsa moea kapa tsa millicing. Ka ho laola boholo ba sethala, sekhahla sa discolot se iphetola le litšobotsi tsa pono tsa methylcelllulose.
5. Tlhahlobo le ho paka sehlahisoa sa ho qetela
Kamora ho hatella, methylcelllubulose e hloka ho etsa taolo ea boleng bo holimo ho netefatsa hore e kopana le litlhaloso tsa theknoloji. Lintho tse tloaelehileng tsa tlhahlobo li kenyelletsa:
SEHLOOHO MUNDUN: Mohopo o phahameng haholo oa mongobo oa methylcelllulose o tla ama botsitso ba bona le polokelo.
Tsamaiso ea boholo ba eona
Tekanyo ea Methylation: Tekanyo ea Methylation ke pontšo ea senotlolo bakeng sa ho hlahloba boleng ba methylcellulose le ts'ebetso ea eona ea komporo le ts'ebeliso.
SELUBIL le pono: The Slubitory le pono ea methylcelllllubulose ke likarolo tsa bohlokoa ts'ebeliso ea eona, haholo-holo tšimong ea lijo le meriana.
Kamora ho feta tlhahlobo, sehlahisoa se tla kenella ho latela litlhoko tse fapaneng, hangata ka mekotleng ea polasetiki, ka mekotleng ea pampiri, litlhaloso tsa tlhahiso le tlhaiso-leseling e ngoe.
6. Tšireletso ea tikoloho le polokeho
Nakong ea tlhahiso ea methyl celpelose ea methyl, mehato e loketseng ea ts'ireletso ea tikoloho e hloka ho nkuoa, haholo-holo ka lik'hemik'hale le li-solven tse sebelisoang ts'ebetsong ea karabelo. Kamora karabelo, litšila tsa metsi le ho senya khase e lokela ho tšoaroa ho qoba ho silafatsa tikoloho. Ntle le moo, litlamante tsa lik'hemik'hale ts'ebetsong ea tlhahiso li lokela ho etsoa ka thata ho latela lits'ebetso tsa polokeho ea polokeho ea basebetsi ho netefatsa polokeho ea basebetsi.
Tsamaiso ea tlhahiso ea methyl e kenyelelitsoe haholo ho tlosoa, karabelo ea kelello, ho hlatsoa le ho se nke lehlakore. Ntho e 'ngoe le e' ngoe e na le tšusumetso ea bohlokoa boleng ba sehlahisoa sa ho qetela, kahoo ho laola taolo ea tlhahiso ho ka ba le ntho e nyarosang haholo. Ka mehato ena, tšepe ea tšepe e lumellanang le litlhoko tse fapaneng ea kopo e ka hlahisoa.
Poso: Feb-19-2025