Hydroxyethyl celluloseose mea taua e maua mai i le cellulose. Ona o le lelei o le tele o meafaitino mataʻutia, faʻafouina, biodegradable, le oona, lelei biocompatibility, ma fua tele, o ana suʻesuʻega ma le faʻaogaina ua tosina mai ai le tele o le gauai. . Ole tau ole viscosity ose fa'ailoga taua tele o fa'atinoga ole hydroxyethyl cellulose. I totonu o lenei pepa, hydroxyethyl cellulose ma viscosity tau i luga aʻe 5 × 104mPa · s ma lefulefu tau itiiti ifo nai lo 0.3% na saunia e le vai-vaega synthesis metotia e ala i alkalization ma etherification faiga lua-laasaga.
O le alkalization faagasologa o le faagasologa sauniuni o cellulose alkali. I lenei pepa, e lua auala e fa'aogaina ai le alkalization. O le auala muamua o le faʻaaogaina o le acetone e fai ma faʻafefe. Ole mea mata ole cellulose o lo'o fa'avae sa'o i se fa'atonuga o le vaifofo vai o le sodium hydroxide. A maeʻa ona faʻataunuʻuina le tali faʻavae, e faʻaopoopoina se sui etherifying e faʻatino saʻo ai le tali etherification. O le auala lona lua e faapea o le cellulose mea mata ua alkalized i se vaifofo vai o le sodium hydroxide ma urea, ma le cellulose alkali saunia e lenei metotia e tatau ona oomi e aveese le sili atu lye i luma o le etherification tali. O le alkali cellulose na saunia i auala eseese na suʻesuʻeina e ala ile infrared spectroscopy ma X-ray diffraction. E tusa ai ma meatotino o oloa saunia e le etherification tali, o le auala filifilia e fuafuaina.
Ina ia mafai ona fuafua le faiga sili ona lelei o le etherification synthesis, sa suʻesuʻeina muamua le faʻaogaina o le antioxidant, lye ma le glacial acetic acid i le etherification reaction. Ona fa'atulagaina lea o le polokalame fa'ata'ita'i o le tali e tasi, fuafua mea e sili atu le a'afiaga i le fa'atinoga o le hydroxyethyl cellulose saunia, ma fa'aaoga le viscosity o le 2% aqueous solution e fai ma fa'asino igoa. O faʻataʻitaʻiga faʻataʻitaʻiga o loʻo faʻaalia ai o mea taua e pei o le aofaʻi o le diluent filifilia, le aofaʻi o le ethylene oxide ua faʻaopoopoina, le taimi o le alkalization, le vevela ma le taimi o le tali muamua, le vevela ma le taimi o le tali lona lua o loʻo i ai uma se aafiaga tele i le faʻatinoga o le oloa. O se fa'ata'ita'iga fa'ata'ita'iga fa'ata'ita'iga fa'atasi ai ma mea e fitu ma la'asaga e tolu na fa'ata'ita'iina, ma o le fa'ai'uga fa'ata'ita'iga e maua mai fa'ai'uga fa'ata'ita'iga e mafai ona va'ava'ai va'ava'ai ai mea muamua ma tulaga lua ma le a'afiaga o mea ta'itasi. Ina ia saunia oloa e maualuga atu le tau o le viscosity, na faia ai se faiga faʻataʻitaʻiga sili ona lelei, ma o le fuafuaga sili ona lelei mo le saunia o le hydroxyethyl cellulose na iu lava ina fuafuaina e ala i faʻataʻitaʻiga.
O meatotino o le maualuga-viscosity sauniahydroxyethyl cellulosena suʻesuʻeina ma faʻataʻitaʻiina, e aofia ai le fuafuaina o le viscosity, mea efuefu, transmittance malamalama, mea susu, ma isi, e ala i spectroscopy infrared, resonance maneta faaniukilia, chromatography kasa, X-ray diffraction, Thermogravimetric-eseesega suʻesuʻega vevela ma isi auala e faʻaaogaina e iloilo ma faʻaalia ai le tulaga tutusa o le oloa, molarity substituent ma isi. O metotia su'ega e fa'atatau i tulaga ASTM.
O le hydroxyethyl cellulose, o se mea taua e maua mai i le cellulose, ua tosina atu i ai ona o le tele o meafaitino mataʻutia, faʻafouina, faʻaleagaina, leai se mea oona, biocompatible, ma maualuga fua. O le viscosity o le hydroxyethyl cellulose o se faʻailoga taua tele o lona faʻatinoga. O le viscosity o le hydroxyethyl cellulose saunia o loʻo i luga aʻe o le 5 × 104mPa · s, ma o le afu e itiiti ifo i le 0.3%.
I totonu o lenei pepa, o le maualuga-viscosity hydroxyethyl cellulose na saunia e ala i le faʻaogaina o le vai-vaega e ala i le alkalization ma le etherification. O le alkalization faagasologa o le sauniuniga o cellulose alkali. Filifili mai auala e lua e fa'alalization. O le tasi e faapea o le cellulose mea o loʻo faʻasaʻo saʻo i le acetone e avea o se mea faʻafefe i totonu o se vaifofo o le sodium hydroxide, ona oʻo ai lea i se tali faʻamaʻi ma se sui etherifying. O le isi e faapea o le cellulosic mea e alkalized i le vai o le sodium hydroxide solution ma le urea. E tatau ona aveese le tele o le alkali i le alkali cellulose a'o le'i faia le gaioiga. I totonu o lenei pepa, o loʻo suʻesuʻeina e le tele o celluloses alkali e ala ile spectroscopy infrared ma le X-ray diffraction. Mulimuli ane, o le auala lona lua e faʻaaogaina e tusa ai ma meatotino o oloa etherification.
Ina ia mafai ona fuafua laasaga sauniuni o le etherification, sa suʻesuʻeina le faʻaogaina o le antioxidant, alkali ma glacial acetic acid i le faagasologa o le 'ai. O a'afiaga e a'afia ai le tapenaga ole hydroxyethyl cellulose na fa'amauina ile su'esu'ega fa'avae tasi. Faʻavae i luga o le tau viscosity o le oloa i le 2% vaifofo vai. O faʻataʻitaʻiga faʻataʻitaʻiga o loʻo faʻaalia ai o le tele o le diluent, le aofaʻi o le ethylene oxide, le taimi o le alkalization, le vevela ma le taimi o le rehydration muamua ma le lua e iai se aafiaga tele i le faʻatinoga o oloa. O le metotia o mea e fitu ma vaega e tolu na faʻaaogaina e fuafua ai le auala sili ona lelei sauniuni.
Matou te auiliiliina meatotino o le sauniahydroxyethyl cellulose, e aofia ai le viscosity, lefulefu, moli transmittance, susu, ma isi. O le fausaga fausaga, homogeneity suitulaga, molarity suitulaga, crystallinity ma le mautu vevela na talanoaina e infrared, nuclear magnetic resonance, gas chromatography, X-ray diffraction, DSC ma le DAT, ma metotia suʻega na faʻaaogaina tulaga ASTM.
Taimi meli: Apr-25-2024