Hydroxyethyl cellulosendi gawo lofunikira la cellulose. Chifukwa chaubwino wa zinthu zambiri zopangira, zongowonjezedwanso, zowola, zopanda poizoni, kuyanjana kwabwino kwachilengedwe, komanso zokolola zambiri, kafukufuku wake ndikugwiritsa ntchito kwake kwakopa chidwi kwambiri. . Viscosity value ndi gawo lofunikira kwambiri la hydroxyethyl cellulose. Mu pepala ili, hydroxyethyl mapadi ndi kukhuthala mtengo pamwamba 5 × 104mPa · s ndi phulusa mtengo zosakwana 0,3% anakonzedwa ndi madzi-gawo kaphatikizidwe njira kudzera alkalization ndi etherification awiri sitepe ndondomeko.
Njira ya alkalization ndikukonzekera njira ya alkali cellulose. Papepalali, njira ziwiri za alkalization zimagwiritsidwa ntchito. Njira yoyamba ndiyo kugwiritsa ntchito acetone ngati diluent. Ma cellulose zopangira zimakhazikitsidwa mwachindunji mumtundu wina wa sodium hydroxide amadzimadzi. Pambuyo zochita za basification ikuchitika, wothandizila etherifying anawonjezera kuchita mwachindunji anachita etherification. Njira yachiwiri ndi yakuti mapadi zopangira ndi alkalized mu amadzimadzi njira ya sodium hydroxide ndi urea, ndi mapadi alkali anakonza njira imeneyi ayenera kufinyidwa kuchotsa owonjezera lye pamaso anachita etherification. Ma cellulose a alkali okonzedwa ndi njira zosiyanasiyana adawunikidwa ndi ma infrared spectroscopy ndi X-ray diffraction. Malingana ndi katundu wa mankhwala okonzedwa ndi etherification reaction, njira yosankhidwa imatsimikiziridwa.
Pofuna kudziwa njira yabwino kwambiri ya kaphatikizidwe ka etherification, njira yochitira antioxidant, lye ndi glacial acetic acid mu etherification reaction idawunikidwa koyamba. Ndiye kupanga experimental pulogalamu ya chinthu chimodzi anachita, kudziwa zinthu zimene zimakhudza kwambiri ntchito ya okonzeka hydroxyethyl mapadi, ndi ntchito mamasukidwe akayendedwe a mankhwala a 2% njira amadzimadzi monga Buku index. Zotsatira zoyeserera zikuwonetsa kuti zinthu monga kuchuluka kwa diluent osankhidwa, kuchuluka kwa ethylene oxide anawonjezera, nthawi ya alkalization, kutentha ndi nthawi ya zomwe zimachitika koyamba, kutentha ndi nthawi yakuchita kwachiwiri zonse zimakhudza kwambiri magwiridwe antchito. mankhwala. Dongosolo loyesera la orthogonal lomwe lili ndi zinthu zisanu ndi ziwiri ndi magawo atatu adapangidwa, ndipo njira yokhotakhota yochokera ku zotsatira zoyeserera imatha kusanthula zoyambira ndi zachiwiri komanso momwe zimakhudzira chinthu chilichonse. Pofuna kukonzekera zinthu zokhala ndi kukhuthala kwapamwamba, chiwembu choyezera bwino chinapangidwa, ndipo chiwembu choyenera chokonzekera hydroxyethyl cellulose chinatsimikiziridwa kudzera muzotsatira zoyesera.
The katundu wa okonzeka mkulu-makamakamakamakamakamakanikahydroxyethyl celluloseadawunikidwa ndikuyesedwa, kuphatikiza kutsimikizika kwa kukhuthala, phulusa, kutulutsa kuwala, chinyezi, ndi zina zambiri, kudzera pazithunzithunzi za infrared, nyukiliya maginito resonance, gas chromatography, X-ray diffraction, Thermogravimetric-differential thermal analysis ndi njira zina zowonetsera kusanthula ndi kuwonetsa kapangidwe kazinthu, kufanana kolowa m'malo, digiri ya molar m'malo, crystallinity, kukhazikika kwamafuta, etc. Njira zoyesera zimatchula miyezo ya ASTM.
Hydroxyethyl cellulose, chinthu chofunikira kwambiri chochokera ku cellulose, chakopa chidwi chifukwa cha kuchuluka kwake kwazinthu zopangira, zongowonjezedwanso, zowola, zopanda poizoni, zosagwirizana, komanso zokolola zambiri. Kukhuthala kwa hydroxyethyl cellulose ndi chizindikiro chofunikira kwambiri cha ntchito yake. The mamasukidwe akayendedwe okonzeka hydroxyethyl mapadi ndi pamwamba 5 × 104mPa · s, ndi phulusa zili zosakwana 0,3%.
Mu pepala ili, high-viscosity hydroxyethyl mapadi anakonzedwa ndi madzi-gawo kaphatikizidwe njira kudzera alkalization ndi etherification. Njira ya alkalization ndikukonzekera alkali cellulose. Sankhani kuchokera ku njira ziwiri za alkalization. Chimodzi ndi chakuti zinthu za cellulose zimasinthidwa mwachindunji ndi acetone monga diluent mu njira yamadzimadzi ya sodium hydroxide, kenako imakumana ndi etherification reaction ndi etherifying agent. Zina ndikuti cellulosic zakuthupi ndi alkalized mu amadzimadzi sodium hydroxide njira ndi urea. The owonjezera mchere mu alkali mapadi ayenera kuchotsedwa pamaso anachita. Papepalali, ma cellulose osiyanasiyana a alkali amawerengedwa ndi ma infrared spectroscopy ndi X-ray diffraction. Pomaliza, njira yachiwiri imatengedwa molingana ndi katundu wa etherification.
Pofuna kudziwa masitepe okonzekera etherification, machitidwe a antioxidant, alkali ndi glacial acetic acid pakudya adaphunzira. Zomwe zimakhudza kukonza kwa hydroxyethyl cellulose zidatsimikiziridwa ndi kuyesa kwa chinthu chimodzi. Kutengera mamasukidwe akayendedwe mtengo wa mankhwala mu 2% amadzimadzi njira. Zotsatira zoyeserera zikuwonetsa kuti kuchuluka kwa diluent, kuchuluka kwa ethylene oxide, nthawi ya alkalization, kutentha ndi nthawi yoyamba ndi yachiwiri kubwezeretsanso madzi m'thupi zimakhudza kwambiri ntchito yamankhwala. Njira ya zinthu zisanu ndi ziwiri ndi magawo atatu adatengedwa kuti adziwe njira yabwino yokonzekera.
Ife kusanthula katundu wa okonzekahydroxyethyl cellulose, kuphatikizapo mamasukidwe akayendedwe, phulusa, kuwala transmittance, chinyezi, etc. The structural characterization, substituent homogeneity, m'malo molarity, crystallinity ndi matenthedwe bata zinakambidwa ndi infuraredi, nyukiliya maginito resonance, mpweya chromatography, X-ray diffraction, DSC ndi DAT, ndi Njira zoyesera zidatengera miyezo ya ASTM.
Nthawi yotumiza: Apr-25-2024