Iselulosi yeHydroxyethylyinto ebalulekileyo evela kwi-cellulose. Ngenxa yoncedo lwezinto ezininzi eziluhlaza, ezinokuhlaziywa, ezinokubola, ezingenatyhefu, ukuhambelana kwebhayoloji elungileyo, kunye nesivuno esikhulu, uphando lwayo kunye nokusetyenziswa kwayo kutsale ingqalelo enkulu. . Ixabiso le-Viscosity libaluleke kakhulu isalathiso sokusebenza se-hydroxyethyl cellulose. Kweli phepha, i-hydroxyethyl cellulose enexabiso le-viscosity ngaphezu kwe-5 × 104mPa · kunye nexabiso lomlotha elingaphantsi kwe-0.3% lilungiswe ngendlela ye-liquid-phase synthesis method ngokusebenzisa i-alkalization kunye ne-etherification inkqubo yamanyathelo amabini.
Inkqubo ye-alkalization yinkqubo yokulungiselela i-alkali cellulose. Kweli phepha, iindlela ezimbini ze-alkalization zisetyenziswa. Indlela yokuqala kukusebenzisa i-acetone njenge-diluent. I-cellulose i-raw material isekelwe ngokuthe ngqo kwi-concentration ethile ye-sodium hydroxide isisombululo se-aqueous. Emva kokuba i-basification reaction yenziwe, i-ejenti ye-etherifying yongezwa ukuba iqhube ngokuthe ngqo ukuphendula kwe-etherification. Indlela yesibini kukuba i-cellulose imathiriyeli ekrwada i-alkali kwisisombululo esimanzi sesodium hydroxide kunye ne-urea, kunye neselulosi yealkali elungiselelwe yile ndlela kufuneka icudiswe ukuze isuse i-lye engaphezulu ngaphambi kokusabela kwe-etherification. I-alkali cellulose elungiselelwe ngeendlela ezahlukeneyo yahlalutywa nge-infrared spectroscopy kunye ne-X-ray diffraction. Ngokweempawu zeemveliso ezilungiselelwe yi-reaction etherification, indlela yokukhetha inqunywe.
Ukuze kumiselwe eyona nkqubo ilungileyo yokwenziwa kwe-etherification, indlela yokusabela ye-antioxidant, i-lye kunye ne-glacial acetic acid kwi-etherification reaction yahlalutywa kuqala. Emva koko uqulunqe inkqubo yovavanyo ye-reaction factor reaction, ukugqiba izinto ezinempembelelo enkulu ekusebenzeni kwe-hydroxyethyl cellulose elungiselelwe, kwaye usebenzise i-viscosity ye-2% yesisombululo se-aqueous yemveliso njengesalathiso sesalathiso. Iziphumo zovavanyo zibonisa ukuba izinto ezifana nexabiso elikhethiweyo le-diluent, inani le-ethylene oxide eyongeziweyo, ixesha le-alkalization, ubushushu kunye nexesha lokuphendula kokuqala, ubushushu kunye nexesha lokuphendula okwesibini konke kunempembelelo enkulu ekusebenzeni kwemveliso. Iskimu sovavanyo lwe-orthogonal esinemiba esixhenxe kunye namanqanaba amathathu azotyiweyo, kwaye ijika lesiphumo elitsalwe kwiziphumo zovavanyo linokuhlalutya ngokubonakalayo izinto eziziiprayimari nezizisekondari kunye nempembelelo yempembelelo yento nganye. Ukuze kulungiswe iimveliso ezinamaxabiso aphezulu e-viscosity, iskimu sokulinga esiphuculweyo saqulunqwa, kwaye iskimu esisiso sokulungiselela i-hydroxyethyl cellulose sagqitywa ngeziphumo zovavanyo.
Iipropati ze-high-viscosity elungiselelwei-hydroxyethyl cellulosezahlalutywa kwaye zavavanywa, kubandakanywa ukumiselwa kwe-viscosity, umxholo wothuthu, ukuhanjiswa kokukhanya, umxholo wokufuma, njl.njl., nge-infrared spectroscopy, i-nuclear magnetic resonance, i-chromatography yegesi, i-X-ray diffraction, uhlalutyo lwe-Thermogravimetric-differential thermal kunye nezinye iindlela zokulinganisa zisetyenziselwa ukuhlalutya i-substitution, i-monofino yemveliso, i-moogravimetric-differential analysis, i-monority substitution. icrystallinity, ukuzinza kwe-thermal, njl. Iindlela zokuvavanya zibhekisela kwimigangatho ye-ASTM.
I-Hydroxyethyl cellulose, i-cellulose ebalulekileyo ephuma kwi-cellulose, itsale umdla ngenxa yobuninzi bemithombo yayo yezinto ezikrwada, ezivuselelekayo, ezinokubola, ezingenatyhefu, ezihambelana nendalo, kunye nesivuno esikhulu. I-viscosity ye-hydroxyethyl cellulose iyisalathisi esibaluleke kakhulu ekusebenzeni kwayo. I-viscosity ye-cellulose elungiselelwe i-hydroxyethyl ingaphezulu kwe-5 × 104mPa · s, kwaye umxholo womlotha ungaphantsi kwe-0.3%.
Kweli phepha, i-high-viscosity hydroxyethyl cellulose yalungiswa nge-liquid-phase synthesis method ngokusebenzisa i-alkalization kunye ne-etherification. Inkqubo ye-alkalization kukulungiswa kwe-alkali cellulose. Khetha kwiindlela ezimbini ze-alkalization. Enye into yokuba izinto ze-cellulose zixutywe ngokuthe ngqo ne-acetone njenge-diluent kwisisombululo se-aqueous sodium hydroxide, kwaye emva koko i-etherification reaction kunye ne-etherifying agent. Enye into yokuba izinto ze-cellulosic zifakwe kwisisombululo se-aqueous sodium hydroxide kunye ne-urea. I-alkali engaphezulu kwi-cellulose ye-alkali kufuneka isuswe ngaphambi kokusabela. Kweli phepha, iiselulosi ezahlukeneyo ze-alkali zifundwa nge-infrared spectroscopy kunye ne-X-ray diffraction. Ekugqibeleni, indlela yesibini yamkelwa ngokweempawu zeemveliso ze-etherification.
Ukuze unqume amanyathelo okulungiselela i-etherification, indlela yokusabela ye-antioxidant, i-alkali kunye ne-glacial acetic acid kwinkqubo yokutya yafundwa. Imiba echaphazela ukulungiswa kwe-hydroxyethyl cellulose yamiselwa ngumfuniselo wento enye. Ngokusekelwe kwixabiso le-viscosity yemveliso kwi-2% isisombululo samanzi. Iziphumo zovavanyo zibonisa ukuba umthamo we-diluent, ubungakanani be-ethylene oxide, ixesha le-alkalization, ubushushu kunye nexesha lokuqala kunye nesibini lokubuyisela amanzi emzimbeni kunempembelelo enkulu ekusebenzeni kwemveliso. Indlela yezinto ezisixhenxe kunye namanqanaba amathathu yamkelwa ukumisela eyona ndlela ilungileyo yokulungiselela.
Sihlalutya iipropati ezilungiselelwei-hydroxyethyl cellulose, kubandakanywa i-viscosity, uthuthu, ukuhanjiswa kokukhanya, ukufuma, njl. Ukubonakaliswa kwesakhiwo, i-homogeneity ebambeleyo, i-substitution molarity, i-crystallinity kunye nokuzinza kwe-thermal zaxoxwa nge-infrared, i-nuclear magnetic resonance, i-chromatography yegesi, i-X-ray diffraction, i-DSC kunye ne-DAT, kunye neendlela zokuvavanya ze-ASTM zamkelwe.
Ixesha lokuposa: Apr-25-2024