Inkqubo yokuvelisa i-HEMC hydroxyethyl methyl cellulose

Inkqubo yokuvelisa i-HEMC hydroxyethyl methyl cellulose

I-Hydroxyethyl methyl cellulose HEMC ingasetyenziselwa njenge-agent ekhuselayo ye-colloidal, i-emulsifier kunye ne-dispersant ngenxa yomsebenzi wayo ongaphezulu kwisisombululo esimanzi. Impembelelo ye-hydroxyethyl methyl cellulose kwiipropati zesamente. IHydroxyethyl methyl cellulose ngumgubo omhlophe ongenavumba, ongenancasa, ongenatyhefu nonyibilika emanzini abandayo ukwenza isisombululo esicacileyo, esincangathi. Ngokuqina, ukunamathela, ukusabalalisa, i-emulsification, ukubunjwa kwefilimu, ukumiswa, i-adsorption, i-gelling, umsebenzi we-surface, ukugcinwa kwamanzi kunye nokukhusela i-colloid, njl. I-Hydroxyethyl methyl cellulose isisombululo samanzi sine-hydrophilicity elungileyo kwaye sisixhobo esisebenzayo sokugcina amanzi.

HEMCinkqubo yemveliso

Ukuveliswa kuveza indlela yokulungiselela i-hydroxyethyl methyl cellulose, esebenzisa ikotoni esulungekileyo njengento eluhlaza kunye ne-ethylene oxide njenge-etherifying agent yokulungisa i-hydroxyethyl methyl cellulose. Izinto ekrwada ukulungiselela hydroxyethyl methyl cellulose ngobunzima: toluene kunye isopropanol umxube 700 ~ 800 iinxalenye njenge-solvent, 30 ~ 40 iinxalenye zamanzi, sodium hydroxide 70 ~ 80 iinxalenye, umqhaphu esulungekileyo 80 ~ 85 iinxalenye, ethylene oxide 20 ~ 28 iinxalenye, i-methane chloride 80 ~ 90 iinxalenye, i-acetic acid ye-glacial 16 ~ 19 iinxalenye; Amanyathelo athile ngala alandelayo:

Isinyathelo sokuqala kukongeza i-toluene kunye ne-isopropyl alcohol umxube, amanzi, kunye ne-sodium hydroxide kwi-kettle yokusabela, ukufudumala ukuya kuma-60 ~ 80 ℃, ubambe imizuzu engama-20 ~ 40;

Isinyathelo sesibini, i-alkalization: i-material ipholile ukuya kwi-30 ~ 50 ℃, i-cotton ecocekileyo, i-toluene kunye ne-isopropyl utywala umxube we-solvent spray, i-vacuum ukuya - 0.006mpa, igcwele i-nitrogen ngamaxesha e-3, ukutshintshwa kwe-alkalization, iimeko ze-alkalization: ixesha le-alkalization. ziiyure ezi-2, ubushushu be-alkalization yi-30℃-50℃;

Isinyathelo sesithathu, i-etherification: emva kwe-alkalization, i-reactor yahlanjululwa kwi-0.05-0.07mpa, kunye ne-ethylene oxide kunye ne-methane chloride yongezwa kwi-30-50 imizuzu. Inqanaba lokuqala le-etherification: 40 ~ 60℃, 1.0 ~ 2.0Hour, uxinzelelo lulawulwa phakathi kwe-0.15 0.3mpa; Inqanaba lesibini le-etherification: 60 ~ 90℃, 2.0 ~ 2.5 iiyure, ulawulo loxinzelelo phakathi kwe-0.4- 0.8mpa;

Inyathelo lesine, ukungathathi hlangothi: yongeza i-acetic elinganisiweyo ye-acetic acid kwi-reactor yokuchithwa kwangaphambili, cinezela kwi-etherized material for neutralization, ukunyuka kweqondo lokushisa ukuya kwi-75 ~ 80 ℃ yokutshatyalaliswa, ukunyuka kweqondo lokushisa ukuya kwi-102 ℃, ukufunyanwa kwe-PH 6-8 Ngaba kugqityiwe. yokuchithwa; Gcwalisa i-90℃ ~ 100℃ reverse osmosis efakelwe amanzi etephu acociweyo kwiketile ye-dessolubilization;

Isinyathelo sesihlanu, ukuhlamba i-centrifugal: inyathelo lesine lezinto ngokusebenzisa i-horizontal spiral centrifuge centrifugal separation, ukwahlukana kwezinto ezidluliselwe kwi-kettle yokuhlamba amanzi ashushu ngaphambili, ukuhlamba impahla;

Inyathelo lesithandathu, ukomiswa kwe-centrifugal: imathiriyeli emva kokuhlanjwa igqithiselwa kwi-dryer nge-horizontal spiral centrifuge, kwaye imathiriyeli yomiswa kwi-150 ~ 170℃. Izinto ezomileyo zityunyuziwe kwaye zipakishwe.

Xa kuthelekiswa nobugcisa obukhoyo bemveliso ye-cellulose ether, ukuveliswa kusebenzisa i-ethylene oxide njenge-etherification agent ukuze kulungiswe i-hydroxyethyl methyl cellulose, equkethe iqela le-hydroxyethyl, inokumelana nokubola okulungileyo, ukuzinza okuhle kwe-viscosity kunye nokumelana nokubola xa igcinwe ixesha elide. Ingasetyenziswa endaweni yenye i-ether cellulose.