Polyanionic cellulose (PAC) ke motsoako oa selulose o qhibilihang ka metsi o nang le mefuta e mengata ea lisebelisoa liindastering tse sa tšoaneng, haholo-holo tšimong ea ho cheka maro a indasteri ea oli le khase.E tsebahala ka thepa ea eona e babatsehang ea rheological, botsitso bo phahameng le ho lumellana le lisebelisoa tse ling.Tlhahiso ea selulose ea polyanionic e kenyelletsa mehato e mengata, ho kenyelletsa ho ntšoa ha cellulose, ho fetola lik'hemik'hale le tlhoekiso.
1. Ho ntšoa ha cellulose:
Thepa e qalang bakeng sa selulose ea polyanionic ke cellulose, polima ea tlhaho e fumanehang maboteng a lisele tsa semela.Cellulose e ka nkiloe linthong tse fapaneng tsa semela, joalo ka makhasi a lehong, lithara tsa k'hothone, kapa limela tse ling tse nang le fiber.Ts'ebetso ea ho hula e kenyelletsa mehato e latelang:
A. Tokiso ea lintho tse tala:
Lisebelisoa tsa semela tse khethiloeng li etsoa esale pele ho tlosa litšila tse kang lignin, hemicellulose le pectin.Hangata sena se finyelloa ka ho kopanya mekhoa ea phekolo ea mechine le ea lik'hemik'hale.
b.Pulping:
Ka mor'a moo, ntho e entsoeng esale pele e phunngoa, e leng mokhoa o senyang likhoele tsa cellulose.Mekhoa e tloaelehileng ea pulping e kenyelletsa kraft pulping le sulfite pulping, e 'ngoe le e' ngoe e na le melemo le melemo ea eona.
C. Karohano ea cellulose:
Thepa ea makhasi e sebelisoa ho arola likhoele tsa cellulosic.Hangata sena se kenyelletsa mokhoa oa ho hlatsoa le ho soeufala ho fumana lisebelisoa tse hloekileng tsa cellulosic.
2. Phetoho ea lik'hemik'hale:
Hang ha cellulose e fumanoa, e fetoloa lik'hemik'hale ho hlahisa lihlopha tsa anionic, ho e fetola selulose ea polyanionic.Mokhoa o sebelisoang haholo molemong ona ke etherification.
A. Etherification:
Etherification e kenyelletsa karabelo ea cellulose ka etherifying ho hlahisa likhokahano tsa ether.Tabeng ea cellulose ea polyanionic, lihlopha tsa carboxymethyl hangata li hlahisoa.Sena se finyelloa ka karabelo ea sodium monochloroacetate ka boteng ba catalyst ea motheo.
b.Karabo ea carboxymethylation:
Karabo ea carboxymethylation e kenyelletsa ho nkela liathomo tsa hydrogen lihlopheng tsa hydroxyl tsa cellulose ka lihlopha tsa carboxymethyl.Karabelo ena e bohlokoa bakeng sa ho kenyelletsa litefiso tsa anionic mokokotlong oa cellulose.
C. fokotsa:
Kamora 'carboxymethylation, sehlahisoa ha se nke lehlakore ho fetolela sehlopha sa carboxymethyl ho li-ion tsa carboxylate.Mohato ona o bohlokoa ho etsa hore polyanionic cellulose e qhibilihe ka metsing.
3. Tlhoekiso:
Joale cellulose e fetotsoeng e hloekisoa ho tlosa lihlahisoa, lik'hemik'hale tse sa sebetsaneng le litšila tse ka amang ts'ebetso ea eona ts'ebetsong e itseng.
A. ho hlatsoa:
Lihlahisoa li hloekisoa ka ho feletseng ho tlosa li-reactants tse feteletseng, letsoai le litšila tse ling.Hangata metsi a sebelisetsoa morero ona.
b.Ho omisa:
Selulose e hloekisitsoeng ea polyanionic e ntan'o omisoa ho fumana sehlahisoa sa ho qetela ka phofo kapa sebōpeho sa granular.
4. Taolo ea boleng:
Mehato ea taolo ea boleng e sebelisoa ho pholletsa le ts'ebetso ea tlhahiso ho netefatsa hore sephetho sa polyanionic cellulose se kopana le litlhaloso tse hlokahalang.Sena se kenyelletsa ho lekola boima ba limolek'hule, tekanyo ea phetoho le lintlha tse ling tse amehang.
5. Kopo:
Polyanionic cellulose e na le ts'ebeliso liindastering tse fapaneng, haholo lits'ebetsong tsa mokelikeli oa ho cheka lekaleng la oli le khase.E sebetsa joalo ka tackifier, moemeli oa taolo ea tahlehelo ea mokelikeli le inhibitor ea shale, e ntlafatsang ts'ebetso ea kakaretso ea mokelikeli oa ho cheka.Lisebelisoa tse ling li kenyelletsa indasteri ea lijo le meriana moo ho qhibiliha ha metsi le thepa ea rheological e fanang ka melemo.
Polyanionic cellulose ke ntho e tsoang ho cellulose e feto-fetohang le ea bohlokoa eo tlhahiso ea eona e hlokang letoto la mehato e hlalositsoeng hantle.Ho ntšoa ha selulose ho tsoa linthong tsa semela, phetoho ea lik'hemik'hale ka etherification, tlhoekiso le taolo ea boleng ke likarolo tsa bohlokoa tsa ts'ebetso ea tlhahiso.Sephetho se hlahisoang ke selulose ea polyanionic ke motsoako oa bohlokoa lits'ebetsong tse fapaneng tsa indasteri, ho thusa ho ntlafatsa ts'ebetso le ts'ebetso ea libopeho tse fapaneng.Ha indasteri e ntse e tsoela pele ho hola, tlhoko ea lihlahisoa tse khethehileng tsa cellulose joalo ka polyanionic cellulose e lebelletsoe ho hola, ho tsamaisa lipatlisiso le nts'etsopele ea mahlale a phetoho ea cellulose le lits'ebetso.
Nako ea poso: Dec-26-2023