Hydroxyethyl cellulosendi chinthu chofunikira kwambiri chochokera ku cellulose. Chifukwa cha ubwino wa zinthu zopangira zambiri, zongowonjezedwanso, zowola, zopanda poizoni, zogwirizana bwino ndi zinthu zina, komanso zokolola zambiri, kafukufuku ndi kugwiritsa ntchito kwake kwakopa chidwi cha anthu ambiri. . Kukhuthala kwa hydroxyethyl cellulose ndi chizindikiro chofunikira kwambiri cha magwiridwe antchito a hydroxyethyl cellulose. Mu pepalali, hydroxyethyl cellulose yokhala ndi viscosity value yoposa 5×104mPa·s ndi phulusa losakwana 0.3% idakonzedwa ndi njira yopangira madzi kudzera mu alkalization ndi etherification ya magawo awiri.
Njira yopangira alkalizing ndi njira yokonzekera alkali cellulose. Mu pepalali, njira ziwiri zogwiritsira ntchito alkalizing zimagwiritsidwa ntchito. Njira yoyamba ndikugwiritsa ntchito acetone ngati diluent. Zinthu zopangira cellulose zimayikidwa mwachindunji mu sodium hydroxide aqueous solution. Pambuyo pochita basification reaction, etherifying agent imawonjezedwa kuti ichite mwachindunji etherification reaction. Njira yachiwiri ndi yakuti zinthu zopangira cellulose zimayikidwa alkalizing mu aqueous solution ya sodium hydroxide ndi urea, ndipo alkali cellulose yokonzedwa ndi njira iyi iyenera kufinyidwa kuti ichotse lye yochulukirapo isanayambe etherification reaction. Alkali cellulose yokonzedwa ndi njira zosiyanasiyana idasanthulidwa ndi infrared spectroscopy ndi X-ray diffraction. Malinga ndi makhalidwe a zinthu zomwe zakonzedwa ndi etherification reaction, njira yosankhidwira imatsimikiziridwa.
Pofuna kudziwa njira yabwino kwambiri yopangira etherification, njira yochitira zinthu ya antioxidant, lye ndi glacial acetic acid mu etherification reaction idasanthulidwa kaye. Kenako pangani pulogalamu yoyesera ya single factor reaction, kudziwa zinthu zomwe zimakhudza kwambiri magwiridwe antchito a hydroxyethyl cellulose yokonzedwa, ndikugwiritsa ntchito kukhuthala kwa yankho lamadzi la 2% la chinthucho ngati chizindikiro chofotokozera. Zotsatira zoyesera zikuwonetsa kuti zinthu monga kuchuluka kwa diluent yosankhidwa, kuchuluka kwa ethylene oxide yowonjezeredwa, nthawi ya alkalizing, kutentha ndi nthawi ya reaction yoyamba, kutentha ndi nthawi ya reaction yachiwiri zonse zimakhudza kwambiri magwiridwe antchito a chinthucho. Ndondomeko yoyesera ya orthogonal yokhala ndi zinthu zisanu ndi ziwiri ndi magawo atatu idapangidwa, ndipo curve ya zotsatira yochokera ku zotsatira zoyesera ikhoza kusanthula bwino zinthu zoyambira ndi zachiwiri komanso momwe chinthu chilichonse chimakhudzira. Pofuna kukonzekera zinthu zomwe zili ndi ma viscosity apamwamba, njira yoyesera yokonzedwa bwino idapangidwa, ndipo njira yabwino kwambiri yokonzekera hydroxyethyl cellulose idatsimikiziridwa pomaliza kudzera mu zotsatira zoyesera.
Katundu wa kukhuthala kwakukulu kokonzedwahydroxyethyl celluloseZinasanthulidwa ndi kuyesedwa, kuphatikizapo kudziwa kukhuthala, kuchuluka kwa phulusa, kufalikira kwa kuwala, kuchuluka kwa chinyezi, ndi zina zotero, kudzera mu infrared spectroscopy, nuclear magnetic resonance, gas chromatography, X-ray diffraction, Thermogravimetric-differential thermal analysis ndi njira zina zofotokozera zinthu zimagwiritsidwa ntchito pofufuza ndikuwonetsa kapangidwe ka chinthucho, kufanana kwa chinthucho, digiri yosinthira molar, crystallinity, kukhazikika kwa kutentha, ndi zina zotero. Njira zoyesera zimatchula miyezo ya ASTM.
Hydroxyethyl cellulose, yomwe ndi yochokera ku cellulose yofunika kwambiri, yakopa chidwi chifukwa cha zinthu zake zambiri zopangira, zongowonjezedwanso, zowola, zopanda poizoni, zogwirizana ndi zinthu zina, komanso zokolola zambiri. Kukhuthala kwa hydroxyethyl cellulose ndi chizindikiro chofunikira kwambiri cha magwiridwe ake. Kukhuthala kwa hydroxyethyl cellulose yokonzedwa kuli pamwamba pa 5×104mPa·s, ndipo kuchuluka kwa phulusa kuli kochepera 0.3%.
Mu pepalali, hydroxyethyl cellulose yokhala ndi kukhuthala kwakukulu idakonzedwa pogwiritsa ntchito njira yopangira madzi kudzera mu alkalizing ndi etherification. Njira yopangira alkalizing ndi kukonzekera alkalizing cellulose. Sankhani njira ziwiri zopangira alkalizing. Choyamba ndi chakuti zinthu za cellulose zimasungunuka mwachindunji ndi acetone ngati diluent mu yankho lamadzi la sodium hydroxide, kenako zimasinthidwa ndi etherification ndi etherifying agent. China ndi chakuti zinthu za cellulosic zimasungunuka mu yankho lamadzi la sodium hydroxide ndi urea. Alkali wochulukirapo mu alkalizing cellulose ayenera kuchotsedwa musanachite reaction. Mu pepalali, ma alkalizing osiyanasiyana amaphunziridwa pogwiritsa ntchito infrared spectroscopy ndi X-ray diffraction. Pomaliza, njira yachiwiri imagwiritsidwa ntchito malinga ndi mawonekedwe a zinthu za etherification.
Pofuna kudziwa njira zokonzekera etherification, njira yochitira zinthu ya antioxidant, alkali ndi glacial acetic acid panthawi yodya inaphunziridwa. Zinthu zomwe zimakhudza kukonzekera kwa hydroxyethyl cellulose zinatsimikiziridwa ndi kuyesa kwa chinthu chimodzi. Kutengera ndi kuchuluka kwa viscosity kwa chinthucho mu yankho lamadzi la 2%. Zotsatira za kuyesaku zikuwonetsa kuti kuchuluka kwa diluent, kuchuluka kwa ethylene oxide, nthawi ya alkalization, kutentha ndi nthawi ya rehydration yoyamba ndi yachiwiri zimakhudza kwambiri magwiridwe antchito a chinthucho. Njira ya zinthu zisanu ndi ziwiri ndi magawo atatu idagwiritsidwa ntchito kuti idziwe njira yabwino kwambiri yokonzekera.
Timasanthula makhalidwe a zokonzedwahydroxyethyl cellulose, kuphatikizapo kukhuthala, phulusa, kufalikira kwa kuwala, chinyezi, ndi zina zotero. Kapangidwe ka kapangidwe kake, kufanana kwa malo, kusinthasintha kwa malo, kristalo ndi kukhazikika kwa kutentha zidakambidwa ndi infrared, nuclear magnetic resonance, gas chromatography, X-ray diffraction, DSC ndi DAT, ndipo njira zoyesera zidatengera miyezo ya ASTM.
Nthawi yotumizira: Epulo-25-2024