Hydroxyethyl methyl cellulose HEMC e ka sebelisoa e le moemeli oa tšireletso ea colloid, emulsifier le dispersant ka lebaka la ts'ebetso ea eona e sebetsang ka holim'a metsi. Mohlala oa tšebeliso ea eona ke o latelang: Phello ea hydroxyethyl methyl cellulose ho thepa ea samente. Hydroxyethyl methylcellulose ke phofo e tšoeu e sa nkheng, e sa latsoeheng, e se nang chefo e qhibilihang metsing a batang ho etsa tharollo e hlakileng, e hlakileng. E na le thepa ea ho tiisa, ho tlama, ho qhalakanya, emulsifying, filimi-forming, suspending, adsorbing, gelling, surface-active, ho boloka mongobo le ho sireletsa li-colloids. Ka lebaka la ts'ebetso e sebetsang ea holim'a metsi a metsi, e ka sebelisoa e le moemeli oa tšireletso ea colloid, emulsifier le dispersant. Hydroxyethyl methyl cellulose aqueous solution e na le hydrophilicity e ntle 'me ke sesebelisoa se bolokang metsi se sebetsang hantle haholo.
lokisetsa
Mokhoa oa ho lokisa hydroxyethyl methyl cellulose, mokhoa ona o kenyelletsa ho sebelisa k'hothone e hloekisitsoeng joalo ka thepa e tala le ethylene oxide joalo ka etherifying agent ho lokisa hydroxyethyl methyl cellulose. Lisebelisoa tse tala tsa ho lokisa hydroxyethyl methyl cellulose li lokiselitsoe ka likarolo ka boima ba 'mele: likarolo tse 700-800 tsa motsoako oa toluene le isopropanol e le solvent, likarolo tse 30-40 tsa metsi, likarolo tse 70-80 tsa sodium hydroxide, likarolo tse 80-85 tsa metsi. k'hothone e hloekisitsoeng, likarolo tse 20-28 tsa oxyethane, likarolo tse 80-90 tsa methyl chloride, le likarolo tse 16-19 tsa glacial acetic acid; mehato e khethehileng ke:
Mohato oa pele, ka sekontiri, eketsa motsoako oa toluene le isopropanol, metsi le sodium hydroxide, ho futhumala ho fihlela ho 60～80 ℃, ho kenngoa metsotso e 20～40;
Mohato oa bobeli, alkalization: pholisa lisebelisoa tse ka holimo ho 30 ~ 50 ℃, eketsa k'hothone e hloekisitsoeng, fafatsa motsoako oa toluene le isopropanol ka solvent, u fallele ho 0.006Mpa, tlatsa naetrojene bakeng sa tse ling tse 3, 'me u sebelise alkali ka mor'a ho fetola Alkalization. maemo ke a latelang: nako ea alkalization ke lihora tse 2, 'me mocheso oa alkalization ke 30 ° C ho 50 ° C;
Mohato oa boraro, etherification: alkalization e phethiloe, reactor e tlosoa ho 0.05 ~ 0.07MPa, ethylene oxide le methyl chloride li kenngoa, 'me li bolokiloe metsotso e 30～50; mohato oa pele oa etherification: 40～60℃, 1.0～2.0 hora, khatello e laoloa pakeng tsa 0.150.3Mpa; mohato oa bobeli oa etherification: 60～90℃, 2.0～2.5 lihora, khatello e laoloa pakeng tsa 0.40.8Mpa;
Mohato oa bone, ho se nke lehlakore: eketsa metered glacial acetic acid esale pele ka ketleleng ea pula, tobetsa ka har'a lisebelisoa tsa etherified bakeng sa ho se nke lehlakore, futhumatsa 75℃ 80 ℃ ho etsa pula, mocheso o nyolohela ho 102 ℃, 'me boleng ba pH ke ho lemoha. 68 Ha lipula li phethetsoe, tanka ea lipula e tlatsoa ka metsi a pompo a hloekisoang ke sesebelisoa sa reverse osmosis ho 90℃～100℃;
Mohato oa bohlano, ho hlatsoa centrifugal: thepa ea mohato oa bone ke centrifuged ka screw centrifuge, 'me thepa e arohaneng e fetisetsoa kettle ea ho hlatsoa e tletseng metsi a chesang esale pele,' me thepa e hlatsuoa;
Mohato oa botšelela, ho omisa ka centrifugal: thepa e hlatsoitsoeng e fetisetsoa ka har'a se omisitsoeng ka "screw centrifuge" e omisitsoeng, thepa e omisitsoe ho 150-170 ° C, 'me lintho tse omisitsoeng li phunyeletsoa le ho patoa.
Ha ho bapisoa le theknoloji e teng ea tlhahiso ea cellulose ether, tlhahiso ea hona joale e nka ethylene oxide e le etherifying agent ho lokisetsa hydroxyethyl methyl cellulose, 'me e na le bokhoni bo botle ba ho thibela hlobo hobane e na le sehlopha sa hydroxyethyl, botsitso bo botle ba viscosity le ho hanyetsa hlobo nakong ea polokelo ea nako e telele. E ka sebelisoa sebakeng sa li-ether tse ling tsa cellulose.
Nako ea poso: Sep-26-2022