I-Hydroxyethyl methyl cellulose HEMC ingasetshenziswa njenge-ejenti evikelayo ye-colloid, i-emulsifier ne-disperant ngenxa yomsebenzi wayo osebenzayo osebenzayo kusisombululo esinamanzi. Isibonelo sokusetshenziswa kwawo simi kanje: Umphumela we-hydroxyethyl methyl cellulose ezakhiweni zikasimende. IHydroxyethyl methylcellulose iyimpushana emhlophe engenaphunga, engenabuthi, encibilika emanzini abandayo ukuze yakhe isixazululo esicacile, esibonakalayo. Inezici zokuqina, ukubopha, ukuhlakaza, i-emulsifying, ukwenza ifilimu, ukumisa okwesikhashana, i-adsorbing, i-gelling, i-surface-active, igcina umswakama kanye nokuvikela ama-colloid. Ngenxa yomsebenzi osebenzayo wesisombululo se-aqueous, ingasetshenziswa njenge-ejenti yokuzivikela ye-colloid, i-emulsifier kanye ne-dispersant. Isixazululo samanzi se-Hydroxyethyl methyl cellulose sine-hydrophilicity enhle futhi iyi-ejenti yokugcina amanzi esebenza kahle kakhulu.
lungiselela
Indlela yokulungiselela i-hydroxyethyl methyl cellulose, le ndlela ihlanganisa ukusebenzisa ukotini ocolisisiwe njengempahla eluhlaza kanye ne-ethylene oxide njenge-ejenti etherifying yokulungisa i-hydroxyethyl methyl cellulose. Izinto zokusetshenziswa zokulungiselela i-hydroxyethyl methyl cellulose zilungiswa ngezingxenye ngesisindo: izingxenye ezingama-700-800 zengxube ye-toluene ne-isopropanol njenge-solvent, izingxenye ezingama-30-40 zamanzi, izingxenye ezingama-70-80 ze-sodium hydroxide, izingxenye ezingama-80-85 ukotini ocwengekile, izingxenye ezingu-20-28 ze-oxyethane, izingxenye ezingu-80-90 ze-methyl chloride, nezingxenye ezingu-16-19 ze-glacial acetic acid; izinyathelo eziqondile yilezi:
Isinyathelo sokuqala, ku-reactor, engeza ingxube ye-toluene ne-isopropanol, amanzi, ne-sodium hydroxide, ifudumale ifike ku-60～80 ℃, ifakwe imizuzu engu-20～40;
Isinyathelo sesibili, i-alkalization: pholisa izinto ezingenhla zibe ngu-30～50℃, engeza ukotini ocolisisiwe, fafaza ingxube ye-toluene ne-isopropanol nge-solvent, phuma uye ku-0.006Mpa, ugcwalise nge-nitrogen esikhundleni se-3, bese ukhipha i-alkali ngemva kokushintsha I-alkalization. izimo zimi kanje: isikhathi se-alkalization amahora angu-2, futhi izinga lokushisa le-alkalization liyi-30 ° C kuya ku-50 ° C;
Isinyathelo sesithathu, i-etherification: i-alkalization iphelile, i-reactor ikhishwa ku-0.05～0.07MPa, i-ethylene oxide ne-methyl chloride iyengezwa, futhi igcinwa imizuzu engu-30～50; isigaba sokuqala se-etherification: 40～60℃, 1.0～2.0 ihora, ingcindezi ilawulwa phakathi kuka-0.150.3Mpa; isigaba sesibili se-etherification: 60～90℃, 2.0～2.5 amahora, ingcindezi ilawulwa phakathi kuka-0.40.8Mpa;
Isinyathelo sesine, ukungathathi hlangothi: engeza i-acetic acid enemitha yemitha kusengaphambili kugedlela lemvula, cindezela ku-etherified material ukuze ungathathi hlangothi, shisisa 75°80 ℃ ukuze wenze imvula, izinga lokushisa likhuphukela ku-102 ℃, futhi inani le-pH lokubona 68 Uma imvula isiqediwe, ithangi lemvula ligcwaliswa ngamanzi kampompi aphathwe idivayisi ye-osmosis engemuva ku-90℃～100℃;
Isinyathelo sesihlanu, ukugeza kwe-centrifugal: into esiteji sesine i-centrifuged nge-screw centrifuge enezingqimba, futhi impahla ehlukanisiwe idluliselwa ku-kettle yokuwasha egcwele amanzi ashisayo kusengaphambili, futhi impahla iyagezwa;
Isinyathelo sesithupha, ukomiswa kwe-centrifugal: impahla egeziwe ithuthelwa esomisini nge-scrifuge evundlile yesikulufu, i-material yomiswa ku-150-170 ° C, futhi into eyomile iyaputshuzwa futhi ihlanganiswe.
Uma kuqhathaniswa nobuchwepheshe obukhona bokukhiqiza i-cellulose ether, ukusungulwa kwamanje kusebenzisa i-ethylene oxide njenge-etherifying agent yokulungisa i-hydroxyethyl methyl cellulose, futhi inekhono elihle lokulwa nomkhuhlane ngoba iqukethe iqembu le-hydroxyethyl, Ukuzinza okuhle kwe-viscosity kanye nokumelana nomkhuhlane ngesikhathi sokugcina isikhathi eside. Ingasetshenziswa esikhundleni sama-cellulose ethers.
Isikhathi sokuthumela: Sep-26-2022