Sinadarin Hydroxyethyl cellulosewani muhimmin abu ne da aka samo daga cellulose. Saboda fa'idodin albarkatun ƙasa masu yawa, masu sabuntawa, masu lalacewa ta hanyar halitta, marasa guba, kyakkyawan jituwa ta halitta, da kuma yawan amfanin ƙasa, bincikensa da aikace-aikacensa sun jawo hankali sosai. . Ƙimar ɗanko muhimmin ma'aunin aiki ne na hydroxyethyl cellulose. A cikin wannan takarda, an shirya hydroxyethyl cellulose tare da ƙimar ɗanko sama da 5 × 104mPa·s da ƙimar toka ƙasa da 0.3% ta hanyar haɗa ruwa-mataki ta hanyar alkalization da etherification tsari mai matakai biyu.
Tsarin alkali shine tsarin shirya cellulose na alkali. A cikin wannan takarda, ana amfani da hanyoyi guda biyu na alkali. Hanya ta farko ita ce amfani da acetone a matsayin mai narkewa. Ana haɗa kayan cellulose kai tsaye a cikin wani taro na sodium hydroxide na ruwa. Bayan an yi aikin basification, ana ƙara wani wakili na etherifying don aiwatar da aikin etherification kai tsaye. Hanya ta biyu ita ce a haɗa kayan cellulose a cikin ruwan sodium hydroxide da urea, kuma dole ne a matse alkali cellulose da aka shirya ta wannan hanyar don cire yawan lye kafin aikin etherification. An yi nazarin alkali cellulose da aka shirya ta hanyoyi daban-daban ta hanyar infrared spectroscopy da X-ray diffraction. Dangane da halayen samfuran da aka shirya ta hanyar etherification, ana tantance hanyar zaɓi.
Domin tantance mafi kyawun tsarin haɗa sinadarin etherification, an fara nazarin tsarin haɗa sinadarin antioxidant, lye da glacial acetic acid a cikin aikin etherification. Sannan aka tsara shirin gwaji na aikin abu ɗaya, aka tantance abubuwan da ke da tasiri sosai kan aikin hydroxyethyl cellulose da aka shirya, sannan aka yi amfani da danko na ruwan da aka samo daga samfurin kashi 2% a matsayin ma'aunin tunani. Sakamakon gwaji ya nuna cewa abubuwa kamar adadin da aka zaɓa na mai, adadin ethylene oxide da aka ƙara, lokacin alkalization, zafin jiki da lokacin amsawar farko, zafin jiki da lokacin amsawar ta biyu duk suna da babban tasiri ga aikin samfurin. An tsara tsarin gwaji na orthogonal tare da abubuwa bakwai da matakai uku, kuma lanƙwasa tasirin da aka samo daga sakamakon gwaji zai iya yin nazari kan abubuwan farko da na biyu da kuma yanayin tasirin kowane abu. Domin shirya samfuran da ke da ƙimar danko mafi girma, an tsara tsarin gwaji da aka inganta, kuma a ƙarshe an ƙayyade tsarin da ya fi dacewa don shirya hydroxyethyl cellulose ta hanyar sakamakon gwaji.
Abubuwan da aka shirya na babban ɗankohydroxyethyl celluloseAn yi nazari da kuma gwada su, gami da tantance danko, abun ciki na toka, watsa haske, abun da ke cikin danshi, da sauransu, ta hanyar amfani da infrared spectroscopy, nuclear magnetic resonance, gas chromatography, X-ray diffraction, Thermogravimetric-differential thermal analysis da sauran hanyoyin halayya don nazarin da kuma fayyace tsarin samfurin, daidaiton maye gurbin, digirin maye gurbin molar, lu'ulu'u, kwanciyar hankali na thermal, da sauransu. Hanyoyin gwajin suna nufin ƙa'idodin ASTM.
Hydroxyethyl cellulose, wani muhimmin abu da aka samo daga cellulose, ya jawo hankali saboda yawan albarkatunsa na asali, mai sabuntawa, mai lalacewa ta halitta, ba mai guba ba, mai jituwa da halittu, da kuma yawan amfanin ƙasa. Dankowar hydroxyethyl cellulose muhimmin alama ne na aikinta. Dankowar hydroxyethyl cellulose da aka shirya ya wuce 5×104mPa·s, kuma abun da ke cikin tokar bai wuce 0.3%.
A cikin wannan takarda, an shirya hydroxyethyl cellulose mai yawan ɗanko ta hanyar amfani da hanyar hada ruwa-lokaci ta hanyar alkalization da etherification. Tsarin alkalization shine shirya alkali cellulose. Zaɓi daga hanyoyi guda biyu na alkalization. Na ɗaya shine cewa kayan cellulose ana alkali su kai tsaye da acetone a matsayin mai narkewa a cikin ruwan sodium hydroxide, sannan a yi aikin etherification tare da wani wakili mai etherifying. Na biyu kuma shine cewa kayan cellulosic ana alkali su a cikin ruwan sodium hydroxide da urea. Dole ne a cire alkali mai yawa a cikin alkali cellulose kafin amsawar. A cikin wannan takarda, ana nazarin nau'ikan alkali celluloses daban-daban ta hanyar infrared spectroscopy da X-ray diffraction. A ƙarshe, an ɗauki hanyar ta biyu bisa ga halayen samfuran etherification.
Domin tantance matakan shirya etherification, an yi nazarin tsarin amsawar antioxidant, alkali da glacial acetic acid a cikin tsarin cin abinci. An tantance abubuwan da suka shafi shirya hydroxyethyl cellulose ta hanyar gwajin abu ɗaya. Dangane da ƙimar danko na samfurin a cikin ruwan ruwa na kashi 2%. Sakamakon gwaji ya nuna cewa yawan mai narkewa, adadin ethylene oxide, lokacin alkali, zafin jiki da lokacin sake farfaɗowa na farko da na biyu suna da babban tasiri akan aikin samfurin. An ɗauki hanyar abubuwa bakwai da matakai uku don tantance mafi kyawun hanyar shiri.
Muna nazarin kaddarorin da aka shiryahydroxyethyl cellulose, gami da danko, toka, watsa haske, danshi, da sauransu. An tattauna halayyar tsarin, daidaiton maye gurbin, molarity na maye gurbin, lu'ulu'u da kwanciyar hankali na thermal ta hanyar infrared, nuclear magnetic resonance, gas chromatography, X-ray diffraction, DSC da DAT, kuma hanyoyin gwajin sun karɓi ƙa'idodin ASTM.
Lokacin Saƙo: Afrilu-25-2024