Amfani da kuma shirya hydroxyethyl methyl cellulose HEMC

hydroxyethyl methyl cellulose HEMCana iya amfani da shi azaman wakili mai kariya daga colloid, emulsifier da kuma warwatsewa saboda aikin samansa a cikin ruwan. Misali na amfani da shi shine kamar haka: Tasirin hydroxyethyl methyl cellulose akan halayen siminti. Hydroxyethyl methylcellulose fari ne mara ƙamshi, mara ɗanɗano, kuma mara guba wanda ke narkewa a cikin ruwan sanyi don samar da mafita mai haske, mai ɗanɗano. Yana da halayen kauri, ɗaurewa, warwatsewa, emulsifying, ƙirƙirar fim, dakatarwa, shawa, gelling, aiki a saman, riƙe danshi da kare colloids. Saboda aikin saman na ruwan, ana iya amfani da shi azaman wakili mai kariya daga colloid, emulsifier da kuma warwatsewa. Maganin ruwa na Hydroxyethyl methyl cellulose yana da kyakkyawan hydrophilicity kuma wakili ne mai ƙarfi na riƙe ruwa.
shirya
Hanya ce ta shirya hydroxyethyl methyl cellulose, hanyar ta ƙunshi amfani da auduga mai tsafta a matsayin kayan da aka sarrafa da kuma ethylene oxide a matsayin maganin etherifying don shiryawahydroxyethyl methyl celluloseAna shirya kayan da ake amfani da su wajen shirya hydroxyethyl methyl cellulose a sassa daban-daban bisa ga nauyi: sassa 700-800 na cakuda toluene da isopropanol a matsayin mai narkewa, sassa 30-40 na ruwa, sassa 70-80 na sodium hydroxide, sassa 80-85 na auduga mai tsafta, sassa 20-28 na oxythane, sassa 80-90 na methyl chloride, da sassa 16-19 na glacial acetic acid; matakan da aka ɗauka sune:

Mataki na farko, a cikin reactor, a zuba cakuda toluene da isopropanol, ruwa, da sodium hydroxide, a dumama su har zuwa digiri 60 zuwa 80, a saka su a cikin injin daskarewa na minti 20 zuwa 40;

Mataki na biyu, alkalization: sanyaya kayan da ke sama zuwa 30~50℃, ƙara auduga mai kyau, fesa cakuda toluene da isopropanol da ruwan da ke narkewa, kwashe zuwa 0.006Mpa, cika da nitrogen don maye gurbinsu sau 3, sannan a yi alkali bayan maye gurbinsu. Yanayin alkalization sune kamar haka: lokacin alkalization shine awanni 2, kuma zafin alkalization 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, sannan a ajiye na tsawon mintuna 30 ~ 50; mataki na farko na etherification: 40 ~ 60℃, awa 1.0 ~ 2.0, ana sarrafa matsin tsakanin 0.150.3Mpa; mataki na biyu na etherification: 60 ~ 90℃, awa 2.0 ~ 2.5, ana sarrafa matsin tsakanin 0.40.8Mpa;

Mataki na 4, hana ruwa shiga: ƙara sinadarin glacial acetic acid a gaba a cikin tukunyar ruwan sama, a danna shi a cikin kayan da aka gyara don hana ruwa shiga, a dumama shi zuwa 75~80 ℃ don yin ruwan sama, zafin jiki zai tashi zuwa 102 ℃, kuma ƙimar pH ɗin ganowa ita ce 68 Lokacin da aka kammala ruwan sama, ana cika tankin ruwan sama da ruwan famfo da na'urar osmosis ta juye ta yi wa magani a 90 ℃~100 ℃;

Mataki na biyar, wankewar centrifugal: kayan da ke mataki na huɗu za a yi amfani da centrifuge na kwance, sannan a mayar da kayan da aka raba zuwa tukunyar wanki da aka cika da ruwan zafi a gaba, sannan a wanke kayan;

Mataki na shida, busar da injin centrifugal: ana jigilar kayan da aka wanke zuwa na'urar busar da su ta hanyar injin centrifuge mai kwance, sannan a busar da kayan a zafin 150-170°C, sannan a niƙa kayan da aka busar a naɗe su a matse su.

Idan aka kwatanta da na yanzucellulose etherA fannin samar da kayayyaki, wannan ƙirƙira ta ɗauki ethylene oxide a matsayin maganin etherifying don shirya hydroxyethyl methyl cellulose, kuma tana da kyakkyawan ikon hana mildew saboda tana ɗauke da ƙungiyar hydroxyethyl, Kyakkyawan kwanciyar hankali da juriya ga mildew yayin ajiya na dogon lokaci. Ana iya amfani da shi maimakon sauran ƙwayoyin cellulose.