Cellulose ethers ke lintho tse fapaneng tse sebelisoang liindastering tse fapaneng ho kenyeletsoa kaho, meriana le lijo.Ts'ebetso ea tlhahiso ea cellulose ether e rarahane haholo, e kenyelletsa mehato e mengata, 'me e hloka tsebo e ngata le lisebelisoa tse khethehileng.Sehloohong sena, re tla tšohla ka ho qaqileng mokhoa oa ho etsa li-cellulose ethers.
Mohato oa pele ts'ebetsong ea tlhahiso ea cellulose ether ke ho lokisa lisebelisoa tse tala.Lisebelisoa tse sebelisoang ho hlahisa li-cellulose ethers hangata li tsoa makhasi a lehong le k'hothone e litšila.Sekhahla sa patsi se qhekelloa ebe se hlahlojoa ho tlosa litšila leha e le life tse kholo, ha litšila tsa k'hothone li ntse li etsoa makhasi a matle.Joale makhasi a fokotsoa ka boholo ka ho sila ho fumana phofo e ntle.Litholoana tsa lehong tse phofshoang le k'hothone ea litšila li ntan'o kopanngoa hammoho ka tekanyo e itseng ho itšetlehile ka thepa e lakatsehang ea sehlahisoa sa ho qetela.
Mohato o latelang o kenyelletsa ts'ebetso ea lik'hemik'hale ea lijo tse tsoakiloeng.Litholoana li qala ho phekoloa ka tharollo ea alkaline (hangata sodium hydroxide) ho senya sebopeho sa fibrous sa selulose.Cellulose e hlahisoang e ntan'o phekoloa ka motsoako o kang carbon disulfide ho hlahisa cellulose xanthate.Kalafo ena e etsoa ka litanka tse nang le phepelo e tsoelang pele ea makhasi.Tharollo ea cellulose xanthate e ntan'o fetisoa ka sesebelisoa sa extrusion ho etsa li-filaments.
Ka mor'a moo, li-cellulose xanthate filaments li ne li ohloa ka bateng e nang le dilute sulfuric acid.Sena se fella ka ho nchafatsoa ha liketane tsa xanthate tsa cellulose, ho etsa likhoele tsa cellulose.Joale likhoele tse sa tsoa thehoa tsa cellulose li hlatsuoa ka metsi ho tlosa litšila leha e le life pele li soeufalitsoe.Mokhoa oa ho soeufatsa o sebelisa hydrogen peroxide ho soeufatsa likhoele tsa cellulose, ebe li hlatsuoa ka metsi ebe li tloheloa hore li ome.
Ka mor'a hore likhoele tsa cellulose li omisoe, li kena tšebetsong e bitsoang etherification.Ts'ebetso ea etherification e kenyelletsa ho kenngoa ha lihlopha tsa ether, joalo ka lihlopha tsa methyl, ethyl kapa hydroxyethyl, ka har'a likhoele tsa cellulose.Mokhoa ona o etsoa ka karabelo ea etherification agent le acid catalyst ka boteng ba solvent.Hangata likarabelo li etsoa tlas'a maemo a laoloang ka hloko a mocheso le khatello ho netefatsa lihlahisoa tse phahameng tsa lihlahisoa le bohloeki.
Nakong ena, ether ea cellulose e ne e le ka sebōpeho sa phofo e tšoeu.Sehlahisoa se phethiloeng se beoa tlas'a letoto la liteko tsa taolo ea boleng ho netefatsa hore sehlahisoa se kopana le likhetho le litlhaloso tse lakatsehang, joalo ka viscosity, bohloeki ba sehlahisoa le mongobo.E ntan'o phutheloa ebe e romelloa ho mosebelisi oa ho qetela.
Ho akaretsa, ts'ebetso ea tlhahiso ea cellulose ether e kenyelletsa ho lokisoa ha thepa e tala, kalafo ea lik'hemik'hale, ho ohla, ho soeufala le ho etherification, ho lateloe ke tlhahlobo ea taolo ea boleng.Tshebetso eohle e hloka lisebelisoa tse khethehileng le tsebo ea lik'hemik'hale tsa lik'hemik'hale 'me e etsoa tlas'a maemo a laoloang ka thata.Ho hlahisa li-cellulose ethers ke mokhoa o rarahaneng le o nkang nako, empa ke oa bohlokoa liindastering tse ngata.
Nako ea poso: Jun-21-2023