Ilungiswa kanjani i-hydroxyethyl cellulose?

I-Hydroxyethyl celluloseiyi-cellulose derivative ebalulekile. Ngenxa yezinzuzo zemithombo eminingi yezinto zokusetshenziswa, evuselelekayo, ebolayo, engenaboli, ehambisana kahle nezinto eziphilayo, kanye nesivuno esikhulu, ucwaningo kanye nokusetshenziswa kwayo kudonsele ukunaka okukhulu. . Inani le-viscosity liyinkomba yokusebenza ebaluleke kakhulu ye-hydroxyethyl cellulose. Kuleli phepha, i-hydroxyethyl cellulose enenani le-viscosity elingaphezu kuka-5×104mPa·s kanye nenani lomlotha elingaphansi kuka-0.3% lalungiswa ngendlela yokwenziwa kwesigaba soketshezi ngokusebenzisa inqubo ye-alkaliization kanye ne-etherification enezinyathelo ezimbili.

Inqubo ye-alkalization inqubo yokulungiselela i-alkali cellulose. Kuleli phepha, kusetshenziswa izindlela ezimbili ze-alkalization. Indlela yokuqala ukusebenzisa i-acetone njengesihlanzi. Izinto zokusetshenziswa kwe-cellulose zisekelwe ngqo ekugxilweni okuthile kwesisombululo samanzi se-sodium hydroxide. Ngemva kokuba kwenziwe ukusabela kwe-basification, i-etherifying agent yengezwa ukuze kwenziwe ukusabela kwe-etherification ngqo. Indlela yesibili ukuthi izinto zokusetshenziswa kwe-cellulose zifakwe i-alkalization kusisombululo samanzi se-sodium hydroxide ne-urea, kanti i-alkali cellulose elungiselelwe ngale ndlela kumele icindezelwe ukuze kususwe i-lye eyengeziwe ngaphambi kokusabela kwe-etherification. I-alkali cellulose elungiselelwe ngezindlela ezahlukene ihlaziywe nge-infrared spectroscopy kanye ne-X-ray diffraction. Ngokwezakhiwo zemikhiqizo elungiselelwe ukusabela kwe-etherification, indlela yokukhetha iyanqunywa.

Ukuze kutholakale inqubo engcono kakhulu yokwenziwa kwe-etherification, indlela yokusabela ye-antioxidant, i-lye kanye ne-glacial acetic acid ekusabeleni kwe-etherification yahlaziywa kuqala. Bese kwakhiwe uhlelo lokuhlola lwe-single factor reaction, kutholakale izici ezinomthelela omkhulu ekusebenzeni kwe-hydroxyethyl cellulose elungisiwe, bese kusetshenziswa i-viscosity yesisombululo samanzi esingu-2% somkhiqizo njengenkomba yokubhekisela. Imiphumela yokuhlola ikhombisa ukuthi izici ezifana nenani elikhethiwe le-diluent, inani le-ethylene oxide engeziwe, isikhathi se-alkalization, izinga lokushisa nesikhathi sokusabela kokuqala, izinga lokushisa nesikhathi sokusabela kwesibili konke kunethonya elikhulu ekusebenzeni komkhiqizo. Uhlelo lokuhlola oluhambisana nezici eziyisikhombisa namazinga amathathu lwaklanywa, futhi ijika lomphumela elithathwe emiphumeleni yokuhlola lingahlaziya ngokubonakalayo izici eziyinhloko nezesibili kanye nomkhuba wethonya lesici ngasinye. Ukuze kulungiselelwe imikhiqizo enamanani aphezulu e-viscosity, kwaklanywa uhlelo lokuhlola olulungiselelwe, futhi uhlelo oluhle kakhulu lokulungiselela i-hydroxyethyl cellulose lwagcina lunqunywe ngemiphumela yokuhlola.

Izakhiwo ze-viscosity ephezulu elungiselelwei-hydroxyethyl celluloseKuhlaziywe futhi kwahlolwa, okuhlanganisa ukunqunywa kwe-viscosity, okuqukethwe komlotha, ukuhanjiswa kokukhanya, okuqukethwe komswakama, njll., nge-infrared spectroscopy, i-nuclear magnetic resonance, i-gas chromatography, i-X-ray diffraction, i-Thermogravimetric-differential thermal analysis kanye nezinye izindlela zokuchaza zisetshenziselwa ukuhlaziya nokuchaza isakhiwo somkhiqizo, ukufana okushintshiwe, izinga lokufaka esikhundleni se-molar, i-crystallinity, ukuzinza kokushisa, njll. Izindlela zokuhlola zibhekisela ezindinganisweni ze-ASTM.

I-Hydroxyethyl cellulose, okuwumkhiqizo obalulekile we-cellulose, idonsele ukunaka ngenxa yezinsiza zayo eziningi zokusetshenziswa, ezivuselelekayo, ezibolayo, ezingenaboli, ezihambisana ne-bio, kanye nesivuno esiphezulu. I-viscosity ye-hydroxyethyl cellulose iyisibonakaliso esibaluleke kakhulu sokusebenza kwayo. I-viscosity ye-hydroxyethyl cellulose elungisiwe ingaphezu kwama-5×104mPa·s, kanti okuqukethwe komlotha kungaphansi kwama-0.3%.

Kuleli phepha, i-hydroxyethyl cellulose ene-viscosity ephezulu yalungiswa ngendlela yokwenziwa kwe-liquid-phase ngokusebenzisa i-alkalization kanye ne-etherification. Inqubo ye-alkalization iwukulungiswa kwe-alkali cellulose. Khetha kusuka ezindleleni ezimbili ze-alkalization. Enye ukuthi izinto ze-cellulose zi-alkalization ngqo nge-acetone njenge-diluent esixazululweni se-sodium hydroxide samanzi, bese kuba nokusabela kwe-etherification nge-etherifying agent. Enye ukuthi izinto ze-cellulosic zi-alkalization esixazululweni se-sodium hydroxide samanzi kanye ne-urea. I-alkali eyengeziwe ku-alkali cellulose kumele isuswe ngaphambi kokusabela. Kuleli phepha, ama-cellulose ahlukahlukene e-alkali afundwa nge-infrared spectroscopy kanye ne-X-ray diffraction. Ekugcineni, indlela yesibili yamukelwa ngokwezakhiwo zemikhiqizo ye-etherification.

Ukuze kutholakale izinyathelo zokulungiselela i-etherification, kwafundwa indlela yokusabela kwe-antioxidant, i-alkali kanye ne-glacial acetic acid enkambisweni yokudla. Izici ezithinta ukulungiswa kwe-hydroxyethyl cellulose zanqunywa ngokuhlolwa kwe-single factor. Ngokusekelwe enanini le-viscosity lomkhiqizo kusisombululo samanzi esingu-2%. Imiphumela yokuhlola ikhombisa ukuthi ivolumu ye-diluent, inani le-ethylene oxide, isikhathi se-alkaliization, izinga lokushisa kanye nesikhathi sokubuyiselwa kwamanzi okokuqala nokwesibili kunethonya elikhulu ekusebenzeni komkhiqizo. Indlela yezinto eziyisikhombisa kanye namazinga amathathu yamukelwa ukunquma indlela yokulungiselela engcono kakhulu.

Sihlaziya izakhiwo ze-preparedi-hydroxyethyl cellulose, kufaka phakathi i-viscosity, umlotha, ukuhanjiswa kokukhanya, umswakama, njll. Ukuhlukaniswa kwesakhiwo, ukulingana okushintshiwe, i-molarity yokufaka esikhundleni, i-crystallinity kanye nokuzinza kokushisa kuxoxwe nge-infrared, i-nuclear magnetic resonance, i-gas chromatography, i-X-ray diffraction, i-DSC kanye ne-DAT, kanye nezindlela zokuhlola zamukele amazinga e-ASTM.