Inqubo yokukhiqiza i-HEMC hydroxyethyl methyl cellulose

Inqubo yokukhiqiza i-HEMC hydroxyethyl methyl cellulose

I-Hydroxyethyl methyl cellulose HEMC ingasetshenziswa njenge-ejenti yokuvikela ye-colloidal, i-emulsifier kanye ne-dispersant ngenxa yomsebenzi wayo ongaphezulu kusixazululo esinamanzi. Umphumela we-hydroxyethyl methyl cellulose kuzakhiwo zikasimende. IHydroxyethyl methyl cellulose iyimpushana emhlophe engenaphunga, engenabuthi, encibilika emanzini abandayo ukuze yakhe isixazululo esisobala, esinamathelayo. Ngokuqina, ukunamathela, ukusabalalisa, i-emulsification, ukwakheka kwefilimu, ukumiswa, i-adsorption, i-gelling, umsebenzi ongaphezulu, ukugcinwa kwamanzi nokuvikelwa kwe-colloid, njll. Isixazululo samanzi singasetshenziswa njengesivikelo se-colloid, i-emulsifier ne-dispersant ngenxa yomsebenzi wayo osebenzayo ongaphezulu. Isixazululo samanzi se-Hydroxyethyl methyl cellulose sine-hydrophilicity enhle futhi iyi-ejenti esebenza kahle yokugcina amanzi.

I-HEMCinqubo yokukhiqiza

Ukusungulwa kudalula indlela yokulungiselela i-hydroxyethyl methyl cellulose, esebenzisa ukotini ocolisisiwe njengempahla eluhlaza kanye ne-ethylene oxide njenge-ejenti e-etherifying ukuze kulungiswe i-hydroxyethyl methyl cellulose. Izinto zokusetshenziswa zokulungiswa kwe-hydroxyethyl methyl cellulose ngesisindo yilezi: ingxube ye-toluene ne-isopropanol izingxenye ezingama-700 ~ 800 njenge-solvent, izingxenye ezingama-30 ~ 40 zamanzi, i-sodium hydroxide 70 ~ 80 izingxenye, ukotini ocwengekile 80 ~ 85 izingxenye, ethylene oxide 20 ~ 28 izingxenye, i-methane chloride izingxenye ezingama-80 ~ 90, i-glacial acetic acid izingxenye eziyi-16 ~ 19; Izinyathelo eziqondile zimi kanje:

Isinyathelo sokuqala ukwengeza ingxube ye-toluene ne-isopropyl alcohol, amanzi, ne-sodium hydroxide kugedlela lokusabela, ukushisa kufika ku-60 ~ 80℃, ubambe imizuzu engu-20 ~ 40;

Isinyathelo sesibili, i-alkalization: impahla ipholile ibe ngu-30 ~ 50 ℃, ukotini ocolisisiwe, i-toluene kanye ne-isopropyl alcohol mix solvent spray, vacuum to - 0.006mpa, igcwele i-nitrogen izikhathi ezi-3 esikhundleni, ukushintshwa kwe-alkalization, izimo ze-alkalization: isikhathi se-alkalization amahora angu-2, izinga lokushisa le-alkalization lingu-30 ℃-50 ℃;

Isinyathelo sesithathu, i-etherification: ngemuva kwe-alkalization, i-reactor ikhishwe ku-0.05-0.07mpa, futhi i-ethylene oxide ne-methane chloride yengezwe imizuzu engu-30-50. Isigaba sokuqala se-etherification: 40 ~ 60℃, 1.0 ~ 2.0Hour, ingcindezi ilawulwa phakathi kuka-0.15 0.3mpa; Isigaba sesibili se-etherification: 60 ~ 90 ℃, 2.0 ~ 2.5 amahora, ukulawula ingcindezi phakathi kuka-0.4- 0.8mpa;

Isinyathelo sesine, ukungathathi hlangothi: engeza i-glacial acetic acid elinganisiwe ku-reactor yokuchithwa kusengaphambili, cindezela ku-etherized material ukuze i-neutralization, ukunyuka kwezinga lokushisa liye ku-75 ~ 80 ℃ ukuze kubhidlizwe, izinga lokushisa likhuphukele ku-102 ℃, ukutholwa kwe-PH 6-8 Ingabe ukuqedwa yokuhlakazwa; Gcwalisa i-90℃ ~ 100℃ reverse osmosis efakwe amanzi kampompi aphethwe eketelani le-dessolubilization;

Isinyathelo sesihlanu, ukugeza centrifugal: isinyathelo sesine impahla ngokusebenzisa enezingqimba Kuvunguza centrifuge centrifugal separation, ukuhlukaniswa izinto zidluliselwe eketela ukuwasha amanzi ashisayo pre-wagcwalisa, impahla ukugeza;

Isinyathelo sesithupha, ukomiswa kwe-centrifugal: impahla ngemva kokuwashwa idluliselwa esomisini nge-spiral centrifuge evundlile, futhi okokusebenza komiswa ku-150 ~ 170℃. Impahla eyomile iyachotshozwa futhi ihlanganiswe.

Uma kuqhathaniswa nobuchwepheshe obukhona bokukhiqiza be-cellulose ether, ukusungulwa kusebenzisa i-ethylene oxide njenge-etherification agent ukuze kulungiswe i-hydroxyethyl methyl cellulose, equkethe iqembu le-hydroxyethyl, inokumelana nokukhunta okuhle, ukuqina okuhle kwe-viscosity kanye nokumelana nesikhutha lapho igcinwe isikhathi eside. Ingasetshenziswa esikhundleni senye i-cellulose ether.