Cellulose ether wani sinadari ne na polymer wanda aka haɗa shi da cellulose na halitta ta hanyar tsarin etherification, kuma kyakkyawan sinadari ne mai kauri da riƙe ruwa.
Bayanin Bincike
An yi amfani da ƙwayoyin cellulose sosai a cikin turmi mai gauraye a cikin 'yan shekarun nan, waɗanda aka fi amfani da su sune wasu ƙwayoyin cellulose marasa ionic, waɗanda suka haɗa da methyl cellulose ether (MC), hydroxyethyl cellulose ether (HEC), hydroxyethyl cellulose ether Methyl cellulose ether (HEMC) da hydroxypropyl methyl cellulose ether (HPMC). A halin yanzu, babu rubuce-rubuce da yawa kan hanyar auna danko na maganin cellulose ether. A ƙasarmu, wasu ƙa'idodi da monographs ne kawai ke ƙayyade hanyar gwajin danko na maganin cellulose ether.
Hanyar shiri na maganin cellulose ether
Shiri Maganin Methyl Cellulose Ether
Ethers na methyl cellulose suna nufin ethers na cellulose waɗanda ke ɗauke da ƙungiyoyin methyl a cikin ƙwayoyin, kamar MC, HEMC da HPMC. Saboda rashin kyawun hydrophobic na rukunin methyl, mafita na cellulose ether waɗanda ke ɗauke da ƙungiyoyin methyl suna da halayen gelation na thermal, wato, ba sa narkewa a cikin ruwan zafi a zafin da ya fi zafin gel ɗinsu (kimanin 60-80°C). Domin hana maganin cellulose ether ya samar da agglomerates, zafafa ruwan sama da zafin gel ɗinsa, kimanin 80~90°C, sannan a ƙara foda na cellulose ether a cikin ruwan zafi, a juya don ya watse, a ci gaba da juyawa da kuma sanyaya. Zuwa yanayin zafin da aka saita, ana iya shirya shi a matsayin maganin cellulose ether iri ɗaya.
Sifofin narkewar abubuwa masu ɗauke da methylcellulose waɗanda ba a yi musu magani a saman su ba
Domin guje wa taruwar cellulose ether a lokacin narkewar, masana'antun wani lokacin suna yin maganin saman sinadarai akan samfuran cellulose ether foda don jinkirta narkewar. Tsarin narkewar sa yana faruwa ne bayan an wargaza cellulose ether gaba ɗaya, don haka ana iya wargaza shi kai tsaye a cikin ruwan sanyi tare da ƙimar pH tsaka tsaki ba tare da samar da agglomerates ba. Mafi girman ƙimar pH na maganin, haka nan lokacin narkewar cellulose ether tare da jinkirin rushewar halayen. Daidaita ƙimar pH na maganin zuwa mafi girma. Alkalinity zai kawar da jinkirin narkewar cellulose ether, yana sa cellulose ether ya samar da agglomerates lokacin narkewa. Saboda haka, ya kamata a ɗaga ko rage ƙimar pH na maganin bayan cellulose ether ya wargaza gaba ɗaya.
Sifofin narkewar ethers masu ɗauke da methylcellulose da aka yi wa magani a saman
Shiri na Maganin Hydroxyethyl Cellulose Ether
Maganin Hydroxyethyl cellulose ether (HEC) ba shi da sifar gelation mai zafi, saboda haka, HEC ba tare da maganin saman ba zai samar da agglomerates a cikin ruwan zafi. Masana'antun gabaɗaya suna yin maganin saman sinadarai akan foda HEC don jinkirta narkewa, ta yadda za a iya watsa shi kai tsaye a cikin ruwan sanyi tare da ƙimar pH tsaka tsaki ba tare da samar da agglomerates ba. Hakazalika, a cikin maganin da ke da babban alkaline, HEC Hakanan yana iya samar da agglomerates saboda jinkirin asarar narkewa. Tunda slurry ɗin siminti yana da alkaline bayan ruwa kuma ƙimar pH na maganin yana tsakanin 12 da 13, ƙimar narkewar cellulose ether da aka yi wa magani a saman slurry shima yana da sauri sosai.
Properties na narkewar HEC da aka yi wa magani a saman
Kammalawa da Bincike
1. Tsarin watsawa
Domin gujewa mummunan tasiri akan lokacin gwaji saboda jinkirin narkewar abubuwan maganin saman, ana ba da shawarar amfani da ruwan zafi don shiri.
2. Tsarin sanyaya
Ya kamata a gauraya ruwan Cellulose ether a kuma sanyaya shi a yanayin zafi na yanayi don rage saurin sanyaya, wanda ke buƙatar tsawaita lokacin gwaji.
3. Tsarin juyawa
Bayan an ƙara cellulose ether a cikin ruwan zafi, a tabbata an ci gaba da juyawa. Idan zafin ruwan ya faɗi ƙasa da zafin gel, cellulose ether zai fara narkewa, kuma maganin zai yi ƙauri a hankali. A wannan lokacin, ya kamata a rage saurin juyawa. Bayan maganin ya kai wani ɗanɗano, yana buƙatar tsayawa cak na fiye da awanni 10 kafin kumfa ya yi iyo a hankali zuwa saman don ya fashe ya ɓace.
Kumfa na Iska a cikin Maganin Cellulose Ether
4. Tsarin shaƙa ruwa
Ya kamata a auna ingancin cellulose ether da ruwa daidai, kuma a yi ƙoƙarin kada a jira maganin ya kai ga mafi girman danko kafin a sake cika ruwa.
5. Gwajin danko
Saboda girman sinadarin cellulose ether, lokacin da ake gwada dankonsa, lokacin da aka saka rotor na viscometer mai juyawa cikin maganin, zai dagula maganin kuma ya shafi sakamakon aunawa. Saboda haka, bayan an saka rotor a cikin maganin, ya kamata a bar shi ya tsaya na minti 5 kafin a gwada.
Lokacin Saƙo: Maris-22-2023