Mokhoa oa tlhahiso ea HEMC hydroxyethyl methyl cellulose

Mokhoa oa tlhahiso ea HEMC hydroxyethyl methyl cellulose

Hydroxyethyl methyl cellulose HEMC e ka sebelisoa e le moemeli oa tšireletso ea colloidal, emulsifier le dispersant ka lebaka la mosebetsi oa eona oa holim'a metsi ka tharollo ea metsi. Phello ea hydroxyethyl methyl cellulose thepa ea samente. Hydroxyethyl methyl cellulose ke phofo e tsoeu e se nang monko, e sa latsoeheng, e se nang chefo e qhibilihang metsing a batang ho etsa tharollo e bonaletsang, e khomarelang. Ka thickening, adhesion, dispersion, emulsification, filimi sebopeho, suspension, adsorption, gelling, holim'a mosebetsi, ho boloka metsi le tšireletso ea colloid, joalo-joalo Tharollo ea metsi e ka sebelisoa e le tšireletso ea colloid, emulsifier le dispersant ka lebaka la ts'ebetso ea eona e sebetsang holimo. Tharollo ea metsi ea Hydroxyethyl methyl cellulose e na le hydrophilicity e ntle ebile ke sesebelisoa se sebetsang sa ho boloka metsi.

HEMCts'ebetso ea tlhahiso

Moqapi ona o senola mokhoa oa ho lokisa hydroxyethyl methyl cellulose, e sebelisang k'hothone e hloekisitsoeng e le thepa e tala le ethylene oxide e le etherifying agent ho lokisa hydroxyethyl methyl cellulose. Thepa e tala bakeng sa ho lokisa hydroxyethyl methyl cellulose ka boima ba 'mele ke: toluene le isopropanol motsoako 700 ~ 800 likarolo e le solvent, 30 ~ 40 likarolo metsi, sodium hydroxide 70 ~ 80 likarolo, e hloekisitsoeng k'hothone 80 ~ 85 likarolo, ethylene oxide 20 ~ 28 likarolo, methane chloride 80 ~ 90 likarolo, glacial acetic acid 16 ~ 19 likarolo; Mehato e khethehileng ke e latelang:

Mohato oa pele ke ho eketsa motsoako oa toluene le isopropyl joala, metsi, le sodium hydroxide ka kettle e arabelang, mocheso ho fihlela ho 60 ~ 80 ℃, tšoara metsotso e 20 ~ 40;

Mohato oa bobeli, alkalization: thepa e pholile ho 30 ~ 50 ℃, k'hothone e hloekisitsoeng, toluene le isopropyl joala motsoako oa solvent spray, vacuum ho - 0.006mpa, e tlatsitsoe ka naetrojene bakeng sa makhetlo a 3, ho fetola alkalization, maemo a alkalization: nako ea alkalization. ke lihora tse 2, mocheso oa alkalization ke 30 ℃-50 ℃;

Mohato oa boraro, etherification: ka mor'a alkalization, sekontiri se ile sa hlajoa ho 0.05-0.07mpa, 'me ethylene oxide le methane chloride li ile tsa eketsoa ka metsotso e 30-50. Mokhahlelo oa pele oa etherification: 40 ~ 60 ℃, 1.0 ~ 2.0Hour, khatello e laoloa pakeng tsa 0.15 0.3mpa; Mokhahlelo oa bobeli oa etherification: 60 ~ 90 ℃, 2.0 ~ 2.5 lihora, khatello ea taolo pakeng tsa 0.4- 0.8mpa;

Mohato oa bone, ho se nke lehlakore: eketsa glacial acetic acid ka mochine o senyang esale pele, tobetsa ka har'a lisebelisoa tsa etherized bakeng sa neutralization, ho nyolohela ha mocheso ho 75 ~ 80 ℃ bakeng sa ho senyeha, ho nyolohela ha mocheso ho 102 ℃, ho lemoha PH 6-8 Ke phetho. ea ho qhalana; Tlatsa 90 ℃ ~ 100 ℃ reverse osmosis e kentsoeng metsi a pompo a hloekisitsoeng ka kettle ea dessolubilization;

Mohato oa bohlano, ho hlatsoa centrifugal: mohato oa bone oa lintho tse bonahalang ka ho rapameng spiral centrifuge centrifugal karohano, karohano ea thepa e fetisetsoa ho ketlele pele ho tlala metsi a chesang ho hlatsoa kettle, lintho tse bonahalang hlatsoa;

Mohato oa botšelela, ho omisa centrifugal: thepa ka mor'a ho hlatsoa e fetisetsoa ka har'a se omisang ka spiral centrifuge, 'me thepa e omisitsoe ho 150 ~ 170 ℃. Thepa e omisitsoeng e siloa ebe e phutheloa.

Ha ho bapisoa le theknoloji e teng ea tlhahiso ea cellulose ether, moqapi o sebelisa ethylene oxide e le moemeli oa etherification ho lokisetsa hydroxyethyl methyl cellulose, e nang le sehlopha sa hydroxyethyl, e na le ho hanyetsa hlobo e ntle, botsitso bo botle ba viscosity le ho hanyetsa hlobo ha e bolokiloe nako e telele. E ka sebelisoa sebakeng sa cellulose ether e 'ngoe.