Hydroxyethyl cellulosewani muhimmin tushen cellulose. Saboda fa'idodin albarkatun albarkatun ƙasa masu yawa, masu sabuntawa, masu yuwuwa, waɗanda ba su da guba, haɓakar ƙwayoyin cuta mai kyau, da yawan amfanin ƙasa, bincike da aikace-aikacen sa sun ja hankali sosai. . Ƙimar danko shine ma'anar aiki mai mahimmanci na hydroxyethyl cellulose. A cikin wannan takarda, hydroxyethyl cellulose tare da danko darajar sama 5 × 104mPa·s da ash darajar kasa da 0.3% aka shirya ta ruwa-lokaci kira hanya ta hanyar alkalization da etherification biyu-mataki tsari.
Tsarin alkalization shine tsarin shiri na alkali cellulose. A cikin wannan takarda, ana amfani da hanyoyin alkalization guda biyu. Hanya ta farko ita ce amfani da acetone a matsayin diluent. Danyen kayan cellulose ya samo asali ne kai tsaye a cikin wani takamaiman taro na maganin ruwa na sodium hydroxide. Bayan da basification dauki da za'ayi, an ƙara wani etherifying wakili kai tsaye aiwatar da etherification dauki. Hanya ta biyu ita ce, ana sanya danyen cellulose a cikin wani ruwa mai ruwa na sodium hydroxide da urea, sannan sai a matse alkali cellulose da aka shirya ta wannan hanya domin cire ledan da ya wuce gona da iri kafin a samu waraka. An yi nazarin cellulose alkali da aka shirya ta hanyoyi daban-daban ta hanyar infrared spectroscopy da X-ray diffraction. Dangane da kaddarorin samfuran da aka shirya ta hanyar etherification, an ƙaddara hanyar zaɓi.
Don ƙayyade mafi kyawun tsarin haɗin gwiwar etherification, an fara nazarin tsarin amsawa na antioxidant, lye da glacial acetic acid a cikin halayen etherification da farko. Sa'an nan kuma tsara shirin gwaji na amsawar factor guda ɗaya, ƙayyade abubuwan da ke da tasiri mafi girma akan aikin hydroxyethyl cellulose da aka shirya, da kuma amfani da danko na 2% na ruwa na samfurin a matsayin ma'anar tunani. Sakamakon gwaji ya nuna cewa abubuwa kamar adadin diluent da aka zaɓa, adadin ethylene oxide da aka kara, lokacin alkalisation, zafin jiki da lokacin amsawar farko, zafin jiki da lokacin amsawar na biyu duk suna da tasiri mai girma akan aikin. samfurin. An tsara tsarin gwaji na orthogonal tare da dalilai bakwai da matakai uku, kuma tasirin tasirin da aka zana daga sakamakon gwaji na iya yin nazari na gani na farko da na sakandare da kuma tasirin tasirin kowane abu. Don shirya samfurori tare da ƙimar danko mafi girma, an ƙaddamar da ingantaccen tsarin gwaji, kuma an ƙaddara tsarin da ya dace don shirya hydroxyethyl cellulose ta ƙarshe ta sakamakon gwajin.
Kaddarorin da aka shirya high-dankohydroxyethyl celluloseAn bincika kuma an gwada su, gami da ƙayyadaddun danko, abun cikin ash, watsa haske, abun ciki na danshi, da sauransu, ta hanyar infrared spectroscopy, resonance magnetic resonance, gas chromatography, X-ray diffraction, Thermogravimetric-bambance-bambancen thermal bincike da sauran halayen halayen ana amfani da su. don tantancewa da siffanta tsarin samfurin, madadin daidaituwa, digirin maye gurbin molar, crystallinity, thermal kwanciyar hankali, da sauransu. Hanyoyin gwaji suna nufin ma'aunin ASTM.
Hydroxyethyl cellulose, wani muhimmin abin da aka samu na cellulose, ya ja hankalin hankali saboda yawan albarkatun albarkatunsa, da ake iya sabuntawa, da ba za a iya cirewa ba, mara guba, mai dacewa, da yawan amfanin ƙasa. Dankowar hydroxyethyl cellulose alama ce mai matukar mahimmanci na aikinta. Dankowar da aka shirya hydroxyethyl cellulose yana sama da 5 × 104mPa·s, kuma abun cikin ash bai wuce 0.3% ba.
A cikin wannan takarda, an shirya high-viscosity hydroxyethyl cellulose ta hanyar samar da ruwa-lokaci kira ta hanyar alkalization da etherification. Tsarin alkalization shine shirye-shiryen alkali cellulose. Zaɓi daga hanyoyin alkalization guda biyu. Ɗaya shine cewa kayan cellulose an haɗa shi kai tsaye tare da acetone a matsayin diluent a cikin maganin sodium hydroxide mai ruwa, sa'an nan kuma ya sami amsawar etherification tare da wakili na etherifying. Sauran shine cewa kayan cellulosic an sanya su a cikin maganin sodium hydroxide mai ruwa da urea. Abubuwan da suka wuce kima a cikin alkali cellulose dole ne a cire kafin dauki. A cikin wannan takarda, an yi nazarin alkali celluloses daban-daban ta hanyar infrared spectroscopy da X-ray diffraction. A ƙarshe, ana ɗaukar hanya ta biyu bisa ga kaddarorin samfuran etherification.
Don ƙayyade matakan shirye-shiryen etherification, an yi nazarin tsarin amsawa na antioxidant, alkali da glacial acetic acid a cikin cin abinci. Abubuwan da suka shafi shirye-shiryen hydroxyethyl cellulose an ƙaddara su ta hanyar gwaji guda ɗaya. Dangane da ƙimar danko na samfurin a cikin 2% bayani mai ruwa. Sakamakon gwaji ya nuna cewa ƙarar diluent, yawan adadin ethylene oxide, lokacin alkalisation, zafin jiki da lokacin farfadowa na farko da na biyu suna da tasiri mai yawa akan aikin samfurin. Hanyar abubuwa bakwai da matakai uku an karɓa don ƙayyade mafi kyawun hanyar shiri.
Muna nazarin kaddarorin da aka shiryahydroxyethyl cellulose, ciki har da danko, ash, watsa haske, danshi, da dai sauransu A tsarin halayyar, maye homogeneity, maye gurbin molarity, crystallinity da thermal kwanciyar hankali da aka tattauna ta infrared, nukiliya Magnetic rawa, gas chromatography, X-ray diffraction, DSC da DAT, da kuma hanyoyin gwaji sun karɓi matsayin ASTM.
Lokacin aikawa: Afrilu-25-2024