Ho hlahisa hydroxyethyl cellulose (HEC) ho kenyelletsa letoto la lik'hemik'hale ho fetola cellulose, e leng polymer ea tlhaho e tsoang limela. HEC e sebelisoa haholo liindastering tse fapaneng, ho kenyeletsoa meriana, litlolo, lijo le kaho, ka lebaka la thepa ea eona ea ho teteana, ho tsitsisa le ho boloka metsi.
Selelekela ho Hydroxyethyl Cellulose (HEC)
Hydroxyethyl cellulose (HEC) ke polymer e sa qhibiliheng metsing, e sa ionic e nkiloeng ho cellulose ka ho fetola lik'hemik'hale. E sebelisoa haholo e le moemeli oa ho teteana, ho etsa jeli le ho tsitsisa liindastering tse fapaneng.
Lisebelisoa tse so fetoloe
Cellulose: Thepa e tala ea mantlha bakeng sa tlhahiso ea HEC. Cellulose e ka fumanoa linthong tse fapaneng tse thehiloeng limela tse kang pulp ea lehong, k'hothone, kapa masala a temo.
Ethylene Oxide (EO): Khemik'hale ea bohlokoa e sebelisetsoang ho kenya lihlopha tsa hydroxyethyl mokokotlong oa cellulose.
Alkali: Ka tloaelo sodium hydroxide (NaOH) kapa potassium hydroxide (KOH) e sebelisoa e le sesebelisoa sa ho baka karabelo.
Mokhoa oa Tlhahiso
Tlhahiso ea HEC e kenyelletsa ho etherification ea cellulose ka ethylene oxide tlas'a maemo a alkaline.
Mehato e latelang e hlalosa ts'ebetso:
1. Kalafo ea Cellulose pele ho nako
Cellulose e hloekisoa pele ho tlosa litšila tse kang lignin, hemicellulose le lintho tse ling tse ntšang lintho tse ling. Cellulose e hloekisitsoeng e omisoa ho fihlela e le mongobo o itseng.
2. Karabelo ea Etherification
Ho Lokisetsa Tharollo ea Alkaline: Tharollo ea metsi ea sodium hydroxide (NaOH) kapa potassium hydroxide (KOH) e lokisitsoe. Ho bokellana ha tharollo ea alkali ho bohlokoa 'me ho hloka ho ntlafatsoa ho latela tekanyo e lakatsehang ea phetolo (DS) ea sehlahisoa sa ho qetela.
Setha sa Karabelo: Cellulose e hloekisitsoeng e hasana ka har'a tharollo ea alkali. Motsoako o futhumatsoa mochesong o itseng, hangata o ka bang 50-70°C, ho netefatsa hore cellulose e ruruhile ka botlalo 'me e ka fumaneha habonolo bakeng sa karabelo.
Ho eketsoa ha Ethylene Oxide (EO): Ethylene oxide (EO) e eketsoa butle ka har'a sejana sa karabelo ha e ntse e boloka mocheso le ho hlohlelletsa khafetsa. Karabelo ke ea exothermic, kahoo taolo ea mocheso e bohlokoa ho thibela ho chesa haholo.
Tlhokomelo ea Karabelo: Tsoelo-pele ea karabelo e hlahlojoa ka ho sekaseka lisampole ka linako tse sa tšoaneng. Mekhoa e kang Fourier-transform infrared spectroscopy (FTIR) e ka sebelisoa ho fumana hore na lihlopha tsa hydroxyethyl li nkeloa sebaka hakae mokokotlong oa cellulose.
Ho se be le lera le ho Hlatsoa: Hang ha DS e lakatsehang e fihlelletswe, karabelo e tingwa ka ho fokotsa tharollo ya alkaline ka asiti, eo hangata e leng asetiki. HEC e hlahang e hlatsuwa hantle ka metsi ho tlosa di-reagent le ditshila tse sa arajwang.
3. Ho Hloekisa le ho Omisa
HEC e hlatsoitsoeng e hloekisoa hape ka ho sefa kapa ho centrifugation ho tlosa litšila tse setseng. HEC e hloekisitsoeng e ntan'o omisoa ho fihlela mongobo o itseng ho fumana sehlahisoa sa ho qetela.
Taolo ea Boleng
Taolo ea boleng e bohlokoa nakong eohle ea ts'ebetso ea tlhahiso ea HEC ho netefatsa botsitso le bohloeki ba sehlahisoa sa ho qetela. Litekanyetso tsa bohlokoa tse lokelang ho beoa leihlo li kenyelletsa:
Tekanyo ea ho nkela sebaka (DS)
Ho thibana ha
Mongobo
pH
Bohloeki (ho se be le litšila)
Mekhoa ea tlhahlobo e kang FTIR, litekanyo tsa viscosity, le tlhahlobo ea likarolo li sebelisoa hangata bakeng sa taolo ea boleng.
Litšebeliso tsa Hydroxyethyl Cellulose (HEC)
HEC e fumana lits'ebetso liindastering tse fapaneng ka lebaka la thepa ea eona e feto-fetohang:
Meriana: E sebelisoa e le sesebelisoa sa ho tiisa li-suspension tse nooang, li-formulations tse entsoeng ka letlalo, le litsamaisong tsa ho fana ka meriana e laoloang.
Litlolo: Li sebelisoa hangata ho litlolo, litlolo le li-shampoo e le setefatsi le se tiisang letlalo.
Lijo: E eketsoa lijong e le ntho e tiisang le e etsang hore li be le mafura, emulsifier le e tsitsitseng.
Kaho: E sebelisoa ka har'a li-mortar tse thehiloeng samente le li-grout ho ntlafatsa ho sebetsa hantle le ho boloka metsi.
Mehopolo ea Tikoloho le Polokeho
Tšusumetso Tikolohong: Tlhahiso ea HEC e kenyelletsa tšebeliso ea lik'hemik'hale tse kang ethylene oxide le alkalis, tse ka bang le litlamorao tikolohong. Tsamaiso e nepahetseng ea litšila le ho latela melaoana ke tsa bohlokoa ho fokotsa tšusumetso tikolohong.
Polokeho: Ethylene oxide ke khase e arabelang haholo le e tukang, e behang likotsi tsa polokeho nakong ea ho e tšoara le ho e boloka. Ho hlokahala moea o lekaneng, lisebelisoa tsa tšireletso ea motho ka mong (PPE), le mekhoa ea polokeho ho netefatsa polokeho ea basebetsi.
Hydroxyethyl cellulose (HEC) ke polymer ea bohlokoa e nang le lits'ebetso tse fapaneng indastering ho tloha meriana ho ea ho tsa kaho. Tlhahiso ea eona e kenyelletsa ho kenngoa ha cellulose ka ethylene oxide tlas'a maemo a alkaline. Mehato ea taolo ea boleng e bohlokoa ho netefatsa botsitso le bohloeki ba sehlahisoa sa ho qetela. Lintho tse lokelang ho nahanoa ka tikoloho le polokeho le tsona li lokela ho rarolloa nakong eohle ea ts'ebetso ea tlhahiso. Ka ho latela mekhoa le liprothokholo tse nepahetseng, HEC e ka hlahisoa ka katleho ha e ntse e fokotsa tšusumetso ea tikoloho le ho netefatsa polokeho ea basebetsi.
Tataiso ena e felletseng e akaretsa ts'ebetso ea tlhahiso ea hydroxyethyl cellulose (HEC) ka botlalo, ho tloha ho lisebelisoa tse tala ho isa taolong ea boleng le lits'ebetso, e fana ka kutloisiso e felletseng ea ts'ebetso ena ea bohlokoa ea tlhahiso ea polymer.
Nako ea poso: Mmesa-10-2024