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Hydroxyethyl cellulose e lokisoa joang?

Hydroxyethyl cellulose ke ntho ea bohlokoa e tsoang ho selulose.Ka lebaka la melemo ea lisebelisoa tse ngata tse tala, tse ka nchafatsoang, tse ka senyehang, tse se nang chefo, li-biocompatibility tse ntle le chai e ngata, lipatlisiso le ts'ebeliso ea tsona li hohetse tlhokomelo e ngata..Boleng ba viscosity ke index ea bohlokoa haholo ea ts'ebetso ea hydroxyethyl cellulose.Ka pampiri ena, hydroxyethyl cellulose e nang le boleng ba viscosity ka holimo ho 5 × 104mPa · s le boleng ba molora bo ka tlase ho 0.3% e lokiselitsoe ka mokhoa oa motsoako oa mokelikeli ka mokhoa oa alkalization le etherification ea mehato e 'meli.

Mokhoa oa alkalization ke mokhoa oa ho lokisa alkali cellulose.Tabeng ena, ho sebelisoa mekhoa e 'meli ea alkalization.Mokhoa oa pele ke ho sebelisa acetone e le mokelikeli.Thepa e tala ea cellulose e thehiloe ka kotloloho mofuteng o itseng oa tharollo ea metsi a sodium hydroxide.Ka mor'a hore karabelo ea motheo e etsoe, ho eketsoa moemeli oa etherifying ho phethahatsa karabelo ea etherification ka ho toba.Mokhoa oa bobeli ke hore thepa e tala ea selulose e entsoe ka tharollo e nang le metsi a sodium hydroxide le urea, 'me selulose ea alkali e lokiselitsoeng ke mokhoa ona e tlameha ho hatelloa ho tlosa lye e feteletseng pele ho karabelo ea etherification.Alkali cellulose e lokisitsoeng ka mekhoa e fapaneng e ile ea hlahlobjoa ka spectroscopy ea infrared le X-ray diffraction.Ho ea ka thepa ea lihlahisoa tse lokiselitsoeng ke karabelo ea etherification, mokhoa oa khetho o khethoa.

E le ho fumana ts'ebetso e ntle ka ho fetisisa ea etherification synthesis, mochine oa karabelo oa antioxidant, lye le glacial acetic acid ka karabelo ea etherification e ile ea hlahlojoa pele.Ebe u theha lenaneo la liteko la karabelo ea ntlha e le 'ngoe, fumana lintlha tse nang le tšusumetso e kholo ts'ebetsong ea selulose e lokisitsoeng ea hydroxyethyl, 'me u sebelise viscosity ea tharollo ea metsi ea 2% ea sehlahisoa e le index ea litšupiso.Liphetho tsa liteko li bonts'a hore lintlha tse kang palo e khethiloeng ea diluent, palo ea ethylene oxide e kenyellelitsoeng, nako ea alkalization, mocheso le nako ea karabelo ea pele, mocheso le nako ea karabelo ea bobeli kaofela li na le tšusumetso e kholo ts'ebetsong. sehlahisoa.Sekema sa liteko sa orthogonal se nang le lintlha tse supileng le maemo a mararo se ile sa etsoa, ​​​​'me sekhahla sa phello se nkiloeng ho tsoa liphethong tsa liteko se ka sekaseka ka mahlo lintlha tsa mantlha le tsa bobeli le ts'usumetso ea ntlha ka 'ngoe.Bakeng sa ho lokisa lihlahisoa tse nang le boleng bo phahameng ba viscosity, ho ile ha etsoa moralo o ntlafalitsoeng oa liteko, mme morero o nepahetseng oa ho lokisa hydroxyethyl cellulose qetellong o ile oa khethoa ka liphetho tsa liteko.

Thepa ea selulose e lokiselitsoeng e phahameng ea viscosity hydroxyethyl e ile ea hlahlojoa le ho lekoa, ho kenyeletsoa qeto ea viscosity, litaba tsa molora, phetiso ea leseli, mongobo, joalo-joalo, ka spectroscopy ea infrared, nuclear magnetic resonance, gas chromatography, X-ray diffraction, Thermogravimetric. -Tlhahlobo e fapaneng ea mocheso le mekhoa e meng ea ho khetholla li sebelisoa ho sekaseka le ho supa sebopeho sa sehlahisoa, ho tšoana ho hoholo, degree ea molar substitution, crystallinity, botsitso ba mocheso, joalo-joalo. Mekhoa ea liteko e bua ka litekanyetso tsa ASTM.

Hydroxyethyl cellulose, ntho ea bohlokoa e nkiloeng ho selulose, e hohetse tlhokomelo ka lebaka la lisebelisoa tse ngata tse tala, tse nchafalitsoeng, tse senyehang, tse se nang chefo, tse lumellanang le lihlahisoa tse ngata.Viscosity ea hydroxyethyl cellulose ke pontšo ea bohlokoa haholo ea ts'ebetso ea eona.Viscosity ea cellulose e lokiselitsoeng ea hydroxyethyl e ka holimo ho 5 × 104mPa · s, 'me molora o ka tlaase ho 0.3%.

Ka pampiri ena, high-viscosity hydroxyethyl cellulose e ile ea lokisoa ka mokhoa oa motsoako oa metsi ka mokhoa oa alkalization le etherification.Ts'ebetso ea alkalization ke ho lokisoa ha selulose ea alkali.Khetha mekhoa e 'meli ea alkalization.E 'ngoe ke hore thepa ea selulose e entsoe ka ho toba ka acetone e le diluent ka tharollo ea sodium hydroxide e nang le metsi, ebe e kena karabelo ea etherification ka etherifying agent.E 'ngoe ke hore thepa ea cellulosic e entsoe ka alkali ka tharollo ea sodium hydroxide le urea.Alkali e feteletseng ka selulose ea alkali e tlameha ho tlosoa pele ho karabelo.Leqepheng lena, li-cellulose tse fapaneng tsa alkali li ithutoa ka spectroscopy ea infrared le X-ray diffraction.Qetellong, mokhoa oa bobeli o amoheloa ho ea ka thepa ea lihlahisoa tsa etherification.

E le ho fumana mehato ea ho itokisa ea etherification, mokhoa oa ho itšoara oa antioxidant, alkali le glacial acetic acid nakong ea ho ja o ile oa ithutoa.Lintlha tse amang ho lokisoa ha hydroxyethyl cellulose li laetsoe ke teko ea ntlha e le 'ngoe.E ipapisitse le boleng ba viscosity ea sehlahisoa ka tharollo ea metsi a 2%.Liphetho tsa liteko li bonts'a hore bongata ba diluent, palo ea ethylene oxide, nako ea alkalization, mocheso le nako ea ho khutlisa metsi ka lekhetlo la pele le la bobeli li na le tšusumetso e kholo ts'ebetsong ea sehlahisoa.Mokhoa oa lintlha tse supileng le maemo a mararo o ile oa amoheloa ho fumana mokhoa o motle oa ho itokisa.

Re sekaseka thepa ea selulose e lokiselitsoeng ea hydroxyethyl, ho kenyelletsa le viscosity, molora, phetisetso ea leseli, mongobo, joalo-joalo The sebopeho sa sebopeho, substituent homogeneity, substitution molarity, crystallinity le botsitso ba mocheso li ile tsa tšohloa ka infrared, nuclear magnetic resonance, gas chromatography, X- ray diffraction, DSC le DAT, le mekhoa ea liteko e amohetse litekanyetso tsa ASTM.


Nako ea poso: Mar-09-2023