Cellulose ethers ke sehlopha se fapaneng sa metsoako e nkiloeng ho cellulose, polymer ea tlhaho e fumanehang maboteng a lisele tsa semela. Li sebelisoa haholo liindastering tse fapaneng ka lebaka la thepa ea tsona e ikhethang, ho kenyelletsa le solubility mefuteng e mengata ea li-solvents. Ho utloisisa boitšoaro ba ho qhibiliha ha cellulose ethers ho bohlokoa bakeng sa ts'ebeliso ea bona ho tsa meriana, lijo, kaho le makaleng a mang.
Li-cellulose ethers hangata li hlahisoa ke selulose e fetolang lik'hemik'hale ka karabelo ea etherification. Mefuta e tloaelehileng ea li-cellulose ethers e kenyelletsa methyl cellulose (MC), ethyl cellulose (EC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), le carboxymethyl cellulose (CMC). Mofuta o mong le o mong o bonts'a litšobotsi tse ikhethang tsa ho qhibiliha ho ipapisitse le sebopeho sa eona sa lik'hemik'hale le tekanyo ea ho fetola.
Ho qhibiliha ha cellulose ethers ho susumetsoa ke lintlha tse kang tekanyo ea polymerization, tekanyo ea ho fetola, boima ba limolek'hule, le mofuta oa lihlopha tse ling. Ka kakaretso, li-cellulose ethers tse nang le likhato tse tlase tsa phalliso le boima ba limolek'hule tse phahameng ha li qhibilihe ha li bapisoa le tse nang le likhato tse phahameng tsa phalliso le boima bo tlase ba limolek'hule.
E 'ngoe ea litšobotsi tsa bohlokoa ka ho fetisisa tsa li-cellulose ethers ke bokhoni ba tsona ba ho qhibiliha ka mefuta e fapaneng ea lihlapolli, ho akarelletsa le metsi, metsoako ea tlhaho, le lino tse itseng tsa polar le tse seng polar. Ho qhibiliha ha metsi ke karolo ea bohlokoa ea li-cellulose ethers tse ngata 'me ho bohlokoa haholo bakeng sa ts'ebeliso ea meriana, lijo le lihlahisoa tsa tlhokomelo ea motho.
Li-cellulose ethers tse qhibilihang ka metsing tse kang HEC, HPC, le CMC li etsa litharollo tse hlakileng, tse hlakileng ha li qhalakanngoa ka metsing. Litharollo tsena li bonts'a boits'oaro ba pseudoplastic, ho bolelang hore viscosity ea bona e fokotseha tlasa khatello ea ho kuta, e etsa hore li tšoanelehe ho sebelisoa e le li-thickeners, stabilizers, le li-agents tsa ho etsa lifilimi lijong le litlamong tsa meriana.
Ho qhibiliha ha li-cellulose ethers ho li-solvents ho itšetlehile ka sebopeho sa bona sa lik'hemik'hale le polarity ea solvent. Mohlala, MC le EC li qhibiliha mefuteng e mengata ea lihlapolli tsa tlhaho, ho kenyeletsoa acetone, ethanol, le chloroform, ka lebaka la boemo ba tsona bo tlase ba ho nkela sebaka le sebopeho sa hydrophobic. Lintho tsena li li etsa tsa bohlokoa lits'ebetsong tse kang lirafshoa, likhomaretsi, le litsamaiso tse laoloang tsa phano ea lithethefatsi.
HEC le HPC, tse nang le lihlopha tsa hydroxyethyl le hydroxypropyl, ka ho latellana, li bonts'a ho qhibiliha ho matlafalitsoeng ho li-solvents tsa polar tse kang alcohols le glycols. Hangata li-cellulose ethers li sebelisoa e le li-thickeners le rheology modifiers lihlahisoa tsa litlolo le tsa tlhokomelo ea botho, hammoho le lipente le lipente tse entsoeng ka metsi.
CMC e qhibiliha ka metsing le lihlapolli tse itseng tsa polar ka lebaka la likaroloana tsa eona tsa carboxymethyl, tse fanang ka ho qhibiliha ha metsi ho ketane ea polymer. E sebelisoa haholo joalo ka sehlahisoa se tenya, stabilizer le emulsifier lihlahisoa tsa lijo, meriana le lits'ebetso tsa indasteri.
Ho qhibiliha ha cellulose ethers ho ka boela ha susumetsoa ke lintho tse ka ntle tse kang mocheso, pH, le boteng ba letsoai kapa lisebelisoa tse ling. Ka mohlala, ho eketsoa ha li-electrolyte tse kang sodium chloride kapa calcium chloride ho ka fokotsa ho qhibiliha ha li-cellulose ethers tse qhibilihang ka metsing ka ho khothalletsa polima aggregation kapa pula.
li-cellulose ethers li bonts'a lisebelisoa tse ngata tsa ho qhibiliha tse etsang hore e be li-additives tsa bohlokoa liindastering tse fapaneng. Bokhoni ba tsona ba ho qhibiliha ka metsing, lihlapolli tsa lintho tse phelang, le lino tse polar li etsa hore mefuta e fapaneng e sebelisoe ho tloha ho metsoako ea meriana ho ea ho thepa ea kaho. Ho utloisisa boitšoaro ba ho qhibiliha ha cellulose ethers ho bohlokoa bakeng sa ho ntlafatsa ts'ebetso le ts'ebetso ea bona lihlahisoa le lits'ebetso tse fapaneng.
Nako ea poso: Apr-24-2024