Cellulose ether wani fili ne na polymer wanda aka haɗa daga cellulose na halitta ta hanyar tsarin etherification, kuma yana da kyau mai mahimmanci da mai riƙe da ruwa.
Bayanan Bincike
Cellulose ethers an yi amfani da ko'ina a bushe-mixed turmi a cikin 'yan shekarun nan, mafi yawan amfani da su ne wasu wadanda ba ionic cellulose ethers, ciki har da methyl cellulose ether (MC), hydroxyethyl cellulose ether (HEC), hydroxyethyl cellulose ether Methyl cellulose ether (HEMC). ) da kuma hydroxypropyl methyl cellulose ether (HPMC). A halin yanzu, babu wallafe-wallafen da yawa akan hanyar ma'auni na danko na cellulose ether bayani. A cikin ƙasarmu, kawai wasu ƙa'idodi da ƙa'idodi na ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun tsarin gwaji na danko na ether na cellulose.
Hanyar shiri na cellulose ether bayani
Shiri na Methyl Cellulose Ether Magani
Methyl cellulose ethers suna nufin ethers cellulose dauke da kungiyoyin methyl a cikin kwayoyin halitta, kamar MC, HEMC da HPMC. Saboda hydrophobicity na ƙungiyar methyl, maganin cellulose ether da ke dauke da ƙungiyoyin methyl suna da halayen gelation na thermal, wato, ba su iya narkewa a cikin ruwan zafi a yanayin zafi fiye da zafin jiki na gelation (kimanin 60-80 ° C). Don hana maganin ether cellulose daga samar da agglomerates, zafi ruwan sama da zafin jiki na gel, kimanin 80 ~ 90 ° C, sa'an nan kuma ƙara cellulose ether foda a cikin ruwan zafi, motsawa don tarwatsa, ci gaba da motsawa kuma kwantar da hankali Zuwa saitin. zafin jiki, za a iya shirya shi a cikin wani uniform cellulose ether bayani.
Abubuwan solubility na ethers masu ɗauke da methylcellulose marasa magani
Domin kauce wa agglomeration na cellulose ether a lokacin rushe tsari, masana'antun wani lokacin gudanar da sinadaran surface jiyya a kan foda cellulose ether kayayyakin don jinkirta rushewa. Tsarinsa na rushewa yana faruwa bayan an tarwatsa cellulose ether gaba ɗaya, don haka ana iya tarwatsa shi kai tsaye a cikin ruwan sanyi tare da ƙimar pH mai tsaka tsaki ba tare da kafa agglomerates ba. Mafi girman ƙimar pH na maganin, ya fi guntu lokacin rushewar ether cellulose tare da jinkirta rushewar kaddarorin. Daidaita ƙimar pH na maganin zuwa ƙimar mafi girma. Alkalinity zai kawar da jinkirin solubility na ether cellulose, haifar da ether cellulose don samar da agglomerates lokacin narkewa. Sabili da haka, ƙimar pH na maganin ya kamata a ɗaga ko saukar da shi bayan an tarwatsa ether cellulose gaba ɗaya.
Solubility Properties na saman-biyya methylcellulose-dauke da ethers
Shiri na Hydroxyethyl Cellulose Ether Magani
Hydroxyethyl cellulose ether (HEC) bayani ba shi da mallaki na thermal gelation, sabili da haka, HEC ba tare da surface jiyya zai samar da agglomerates a cikin ruwan zafi. Masu sana'a gabaɗaya suna aiwatar da jiyya a saman sinadarai akan foda HEC don jinkirta rushewa, ta yadda za'a iya tarwatsa shi kai tsaye cikin ruwan sanyi tare da ƙimar pH mai tsaka tsaki ba tare da samar da agglomerates ba. Hakazalika, a cikin wani bayani tare da babban alkalinity, HEC Hakanan zai iya samar da agglomerates saboda jinkirta asarar solubility. Tun da siminti slurry ne alkaline bayan hydration da pH darajar da mafita ne tsakanin 12 da 13, da narkar da kudi na surface-bi da cellulose ether a cikin sumunti slurry shi ma da sauri.
Solubility Properties na saman-biyya HEC
Kammalawa da Nazari
1. Tsarin watsawa
Don kauce wa mummunan sakamako akan lokacin gwaji saboda jinkirin rushewar abubuwan jiyya na saman, ana bada shawarar yin amfani da ruwan zafi don shiri.
2. Tsarin sanyaya
Ya kamata a motsa hanyoyin ether na Cellulose kuma a sanyaya su a zafin jiki na yanayi don rage yawan sanyaya, wanda ke buƙatar ƙarin lokutan gwaji.
3. Tsarin motsawa
Bayan an ƙara ether cellulose zuwa ruwan zafi, tabbatar da ci gaba da motsawa. Lokacin da yawan zafin jiki na ruwa ya ragu a ƙasa da zafin jiki na gel, ether cellulose zai fara narkewa, kuma maganin zai zama danko. A wannan lokacin, ya kamata a rage saurin motsawa. Bayan maganin ya kai ɗan ɗanɗano, yana buƙatar tsayawa sama da sa'o'i 10 kafin kumfa a hankali ya yi iyo zuwa saman don fashe da ɓacewa.
Kumfa na iska a cikin Maganin Cellulose Ether
4. Tsarin ruwa
Ya kamata a auna ingancin cellulose ether da ruwa daidai, kuma kuyi ƙoƙarin kada ku jira mafita don isa mafi girman danko kafin sake cika ruwa.
5. Gwajin danko
Saboda thixotropy na cellulose ether bayani, lokacin da gwada danko, lokacin da aka sanya rotor na viscometer na jujjuya a cikin maganin, zai damu da maganin kuma ya shafi sakamakon aunawa. Saboda haka, bayan an shigar da rotor a cikin maganin, ya kamata a bar shi ya tsaya na 5 min kafin gwaji.
Lokacin aikawa: Maris 22-2023