Hydroxyethyl celluloseke sehlahisoa sa bohlokoa sa cellulose. Ka lebaka la melemo ea mehloli e mengata ea lintho tse tala, e nchafatsoang, e ka bolang, e seng chefo, e lumellanang hantle le lintho tse phelang, le chai e kholo, lipatlisiso le ts'ebeliso ea eona li hohetse tlhokomelo e kholo. . Boleng ba viscosity ke index ea bohlokoa haholo ea ts'ebetso ea hydroxyethyl cellulose. Pampiring ena, hydroxyethyl cellulose e nang le boleng ba viscosity bo fetang 5×104mPa·s le boleng ba molora bo ka tlase ho 0.3% e lokisitsoe ka mokhoa oa ho kopanya mokhahlelo oa metsi ka mokhoa oa alkalization le etherification oa mehato e 'meli.
Mokhoa oa ho lokisa alkalize ke mokhoa oa ho lokisa alkali cellulose. Pampiring ena, ho sebelisoa mekhoa e 'meli ea ho lokisa alkalize. Mokhoa oa pele ke ho sebelisa acetone e le motsoako. Thepa e tala ea cellulose e thehiloe ka ho toba ka har'a motsoako o itseng oa tharollo ea metsi ea sodium hydroxide. Kamora hore karabelo ea basification e etsoe, moemeli oa etherifying o eketsoa ho etsa karabelo ea etherification ka kotloloho. Mokhoa oa bobeli ke hore thepa e tala ea cellulose e be alkalize ka tharollo ea metsi ea sodium hydroxide le urea, 'me alkali cellulose e lokisitsoeng ka mokhoa ona e tlameha ho hatelloa ho tlosa lye e ngata pele ho karabelo ea etherification. Alkali cellulose e lokisitsoeng ka mekhoa e fapaneng e ile ea hlahlojoa ka infrared spectroscopy le X-ray diffraction. Ho ea ka litšobotsi tsa lihlahisoa tse lokisitsoeng ke karabelo ea etherification, mokhoa oa khetho oa khethoa.
E le ho fumana mokhoa o motle ka ho fetisisa oa ho kopanya etherification, mokhoa oa karabelo oa antioxidant, lye le glacial acetic acid karabelong ea etherification o ile oa hlahlojoa pele. Ebe ho etsoa lenaneo la liteko la karabelo ea ntlha e le 'ngoe, ho fumanoa lintlha tse nang le tšusumetso e kholo ts'ebetsong ea hydroxyethyl cellulose e lokisitsoeng, 'me ho sebelisoe viscosity ea tharollo ea metsi ea 2% ea sehlahisoa e le index ea litšupiso. Liphetho tsa liteko li bontša hore lintlha tse kang bongata bo khethiloeng ba diluent, bongata ba ethylene oxide e ekelitsoeng, 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 ea sehlahisoa. Morero oa teko o nang le lintlha tse supileng le maemo a mararo o ile oa etsoa, 'me sekhahla sa phello se nkiloeng liphethong tsa liteko se ka hlahloba ka mahlo lintlha tsa mantlha le tsa bobeli le mokhoa oa tšusumetso ea ntlha ka' ngoe. E le ho lokisa lihlahisoa tse nang le boleng bo phahameng ba viscosity, morero oa liteko o ntlafalitsoeng o ile oa etsoa, 'me morero o motle oa ho lokisa hydroxyethyl cellulose qetellong o ile oa fumanoa ka liphetho tsa liteko.
Thepa ea viscosity e phahameng e lokiselitsoenghydroxyethyl celluloseLi ile tsa hlahlojoa le ho lekoa, ho kenyeletsoa le ho fumana bonnete ba ho hlaka, molora, phetiso ea leseli, mongobo, jj., ka spectroscopy ea infrared, nuclear magnetic resonance, gas chromatography, X-ray diffraction, Thermogravimetric-differential thermal analysis le mekhoa e meng ea ho hlalosa e sebelisoa ho sekaseka le ho hlalosa sebopeho sa sehlahisoa, ho tšoana ha sebaka, tekanyo ea ho nkeloa sebaka ha molar, kristale, botsitso ba mocheso, jj. Mekhoa ea liteko e bua ka maemo a ASTM.
Hydroxyethyl cellulose, e leng sehlahisoa sa bohlokoa sa cellulose, e hohetse tlhokomelo ka lebaka la mehloli ea eona e mengata ea lintho tse tala, e nchafatsoang, e ka bola, ha e na chefo, e lumellana le lintho tse phelang, 'me e fana ka chai e ngata. Viscosity ea hydroxyethyl cellulose ke sesupo sa bohlokoa haholo sa ts'ebetso ea eona. Viscosity ea hydroxyethyl cellulose e lokisitsoeng e kaholimo ho 5×104mPa·s, 'me molora o ka tlase ho 0.3%.
Pampiring ena, hydroxyethyl cellulose e nang le viscosity e phahameng e lokisitsoe ka mokhoa oa ho kopanya mokhahlelo oa metsi ka alkaliization le etherification. Ts'ebetso ea alkaliization ke ho lokisa alkali cellulose. Khetha ho tsoa mekhoeng e 'meli ea alkaliization. E 'ngoe ke hore thepa ea cellulose e na le alkali e tobileng ka acetone e le motsoako ka har'a tharollo ea sodium hydroxide ea metsi, ebe e feta karabelong ea etherification ka moemeli oa etherifying. E 'ngoe ke hore thepa ea cellulosic e na le alkali ka har'a tharollo ea sodium hydroxide ea metsi le urea. Alkali e feteletseng ka har'a alkali cellulose e tlameha ho tlosoa pele ho karabelo. Pampiring ena, li-cellulose tse fapaneng tsa alkali li ithutoa ka infrared spectroscopy le X-ray diffraction. Qetellong, mokhoa oa bobeli o amoheloa ho latela thepa ea lihlahisoa tsa etherification.
E le ho fumana mehato ea ho lokisa etherification, mokhoa oa karabelo oa antioxidant, alkali le glacial acetic acid nakong ea ho ja o ile oa ithutoa. Mabaka a amang ho lokisoa ha hydroxyethyl cellulose a ile a khethoa ke teko ea ntlha e le 'ngoe. Ho latela boleng ba viscosity ea sehlahisoa ka tharollo ea metsi ea 2%. Liphetho tsa liteko li bontša hore bophahamo ba motsoako, bongata ba ethylene oxide, nako ea alkalization, mocheso le nako ea ho khutlisetsa metsi 'meleng 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 ka ho fetisisa oa ho lokisa.
Re sekaseka thepa ea lintho tse lokisitsoenghydroxyethyl cellulose, ho kenyeletsoa le viscosity, molora, phetiso ea leseli, mongobo, jj. Tlhaloso ea sebopeho, homogeneity e nkeloang sebaka, molarity ea sebaka, kristale le botsitso ba mocheso li tšohliloe ke infrared, nuclear magnetic resonance, gas chromatography, X-ray diffraction, DSC le DAT, 'me mekhoa ea liteko e amohetse litekanyetso tsa ASTM.
Nako ea poso: Mmesa-25-2024