Hydroxyethyl methyl cellulose HEMC za a iya amfani da colloid m wakili, emulsifier da dispersant saboda ta surface aiki aiki a cikin ruwa bayani. Misalin aikace-aikacensa shine kamar haka: Tasirin hydroxyethyl methyl cellulose akan kaddarorin siminti. Hydroxyethyl methylcellulose wani wari ne, marar ɗanɗano, farin foda mara guba wanda ke narkewa a cikin ruwan sanyi don samar da bayani mai haske, mai danko. Yana yana da kaddarorin thickening, dauri, watsawa, emulsifying, film-forming, suspending, adsorbing, gelling, surface-aiki, rike danshi da kuma kare colloid. Saboda aikin aiki na farfajiya na maganin ruwa, ana iya amfani dashi azaman wakili mai kariya na colloid, emulsifier da mai watsawa. Hydroxyethyl methyl cellulose bayani mai ruwa-ruwa yana da kyau hydrophilicity kuma shi ne babban tasiri mai riƙe ruwa.
shirya
Hanya don shirya hydroxyethyl methyl cellulose, hanyar ta ƙunshi yin amfani da auduga mai ladabi a matsayin albarkatun kasa da ethylene oxide a matsayin wakili na etherifying don shirya hydroxyethyl methyl cellulose. An shirya albarkatun kasa don shirya hydroxyethyl methyl cellulose a cikin sassa da nauyi: 700-800 sassa na cakuda toluene da isopropanol a matsayin sauran ƙarfi, 30-40 sassa na ruwa, 70-80 sassa na sodium hydroxide, 80-85 sassa na sodium hydroxide. auduga mai ladabi, 20-28 sassa na oxyethane, 80-90 sassa na methyl chloride, da kuma 16-19 sassa na glacial acetic acid; takamaiman matakai sune:
Mataki na farko, a cikin reactor, ƙara toluene da cakuda isopropanol, ruwa, da sodium hydroxide, ana dumama har zuwa 60 ~ 80 ℃, a sanya shi cikin minti 20-40;
Mataki na biyu, alkalization: sanyaya kayan da ke sama zuwa 30 ~ 50 ℃, ƙara auduga mai ladabi, fesa cakuda toluene da isopropanol tare da sauran ƙarfi, kwashe zuwa 0.006Mpa, cika da nitrogen don maye gurbin 3, sannan aiwatar da alkali bayan maye gurbin Alkalization. yanayi sune kamar haka: lokacin alkalization shine sa'o'i 2, kuma alkalization zafin jiki shine 30 ° C zuwa 50 ° C;
Mataki na uku, etherification: an kammala alkalization, an kwashe reactor zuwa 0.05 ~ 0.07MPa, an ƙara ethylene oxide da methyl chloride, kuma a ajiye shi na minti 30-50; mataki na farko na etherification: 40～60 ℃, 1.0～2.0 hour, ana sarrafa matsa lamba tsakanin 0.150.3Mpa; mataki na biyu na etherification: 60～90 ℃, 2.0～2.5 hours, da matsa lamba da ake sarrafawa tsakanin 0.40.8Mpa;
Mataki na 4, neutralization: ƙara metered glacial acetic acid a gaba zuwa hazo kettle, danna cikin etherified abu don neutralization, zafi sama 75 ~ 80 ℃ don gudanar da hazo, da zazzabi ya tashi zuwa 102 ℃, da kuma gano pH darajar ne 68 Lokacin da aka gama hazo, ana cika tankin hazo da ruwan famfo da na'urar reverse osmosis ke bi da su a 90℃～100℃;
Mataki na biyar, centrifugal wankewa: kayan da ke cikin mataki na hudu an yi amfani da su ta hanyar centrifuge na kwance a kwance, kuma an canja kayan da aka raba zuwa tukunyar wankewa da aka cika da ruwan zafi a gaba, kuma an wanke kayan;
Mataki na shida, bushewar centrifugal: ana jigilar kayan da aka wanke a cikin na'urar bushewa ta hanyar kwancen centrifuge a kwance, an bushe kayan a 150-170 ° C, kuma busassun busassun busassun an kwashe su kuma an tattara su.
Idan aka kwatanta da data kasance cellulose ether samar da fasaha, yanzu sabon abu rungumi dabi'ar ethylene oxide a matsayin etherifying wakili don shirya hydroxyethyl methyl cellulose, kuma yana da kyau anti-mildew ikon domin ya ƙunshi hydroxyethyl kungiyar, Kyakkyawan danko kwanciyar hankali da mildew juriya a lokacin dogon lokacin ajiya ajiya. Ana iya amfani dashi maimakon sauran ethers cellulose.
Lokacin aikawa: Satumba-26-2022