Isicelo nokulungiselela kwe-hydroxyethylm methyl cellulose hemc

I-Hydroxyyethyl methyl cellulose hemc ingasetshenziswa njenge-ejenti yokuvikela i-colloid, emulsifier kanye ne-dispersant ngenxa yokusebenza kwayo okusebenzayo kwesisombululo esisemanzini. Isibonelo sohlelo lwayo kanjena: Umphumela weHydroxYethyll Methyl Cellulose kwizakhiwo zikasimende. IHydroxYethyl Methylcellulose iyi-powder emhlophe engenamkhawulo, engenambitha, engenamkhawulo, i-nontoxic white ehlanza amanzi abandayo ukwakha isixazululo esicacile, esibonakalayo. Inezakhiwo zokuqina, ukubopha, ukusabalalisa, ukusabalalisa, ukwakha amafilimu, ukumisa amafilimu, ukumisa ama-adsorbing, ukugada, indawo esebenzayo, ukugcina umswakama nokuvikela umswakama nokuvikela ama-colloids. Ngenxa yomsebenzi osebenzayo wekhambi elinamanzi, lingasetshenziswa njenge-ejenti evikela i-colloid, i-emulsifier kanye ne-dispersant. I-Hydroxyyethyl methyllulose isixazululo esinamanzi ane-hydrophility enhle futhi i-ejenti esebenza ngempumelelo.

lungiselela
Indlela yokulungiselela i-hydroxyyethyl methyl celtulose, indlela ehlanganisa ukusebenzisa ukotini okucwengiwe njengento eluhlaza kanye ne-ethylene oxide njenge-ejenti yokuphelisa i-methyl cellulose. Izinto ezivuthiwe zokulungiselela i-hydroxyethylllllllls zilungiselelwe izingxenye ngesisindo: izingxenye ezingama-700-800 ze-solium hydroxide, izingxenye ezingama-80-8-90 ze-oxyethane, nezingxenye ezingama-80-90 ze-methyl chloride, nezingxenye eziyi-16-19 ze i-glacial acetic acid; Izinyathelo ezithile yilezi:

Isinyathelo sokuqala, ku-Reactoror, engeza ingxube ye-toluene ne-isopropanol, amanzi, ne-sodium hydroxide, bafudumale kuze kube ngu-60 ~ 80 ℃, bafakwe ngaphansi kwemizuzu engama-20 ~ 40;

The second step, alkalization: cool the above materials to 30～50℃, add refined cotton, spray the mixture of toluene and isopropanol with solvent, evacuate to 0.006Mpa, fill with nitrogen for 3 replacements, and carry out alkali after replacement The alkalization conditions are as follows: the alkalization time is 2 hours, and the alkalization temperature is 30°C to 50°C;

Isinyathelo sesithathu, ukusheshisa: I-alkalization isiqediwe, i-Reactor ikhishwe ku-0.05 ~ 0.07mpa, i-ethylene oxide ne-methyl chloride ziyangezwa, futhi zigcinwe imizuzu engama-30 ~ 50; isigaba sokuqala sokuthezeka: 40 ~ 60 ℃, 1.0 ~ 2.0 ihora, ingcindezi ilawulwa phakathi kuka-0.150.3MPA; isigaba sesibili sokuthezeka: 60 ~ 90 ℃, amahora angama-2.0 ~ ama-2,5, ingcindezi ilawulwa phakathi kuka-0.40.8MPA;

Isinyathelo se-4, ukungathathi hlangothi: Faka i-Ithelial acetic acetic acetic acid kusengaphambili i-kettle yezulu, ucindezele i-105 ~ 80 ℃ ukufeza amanzi okuvikelwa, ukushisa kwezulu kugcwaliswa, ithangi lemvula ligcwaliswa ngocingo oluphethwe yi-Osmosis ephathwe ngocingo 90 ℃ ~ 100 ℃;

Isinyathelo sesihlanu, ukugeza iziqu: Izinto ezibonakalayo zesine zifakwe kwi-centrifuge centrifuge centrifuge, futhi impahla ehlukanisiwe idluliselwa echibini eligeza eligcwele ngaphambi kwesikhathi, futhi lokho kugezwa;

Isinyathelo sesithupha, ukomisa okwenziwe nge-centrifugal: Izinto ezihlanjiwe zithuthelwa esomisi ngesikulufu esivundlile se-centrifuge, impahla yomiswa ngo-150-170 ° C, futhi impahla eyomile ihlehlisiwe futhi ihlanganiswe.

Uma kuqhathaniswa nobuchwepheshe obukhona be-cellulose ether ether etherget, ukusungulwa kwamanje kwamukela i-ethylene oxide njengoba i-ejenti yokuphambana kwe-methyl cellulose, futhi inekhono elihle le-anti-strew ngoba i-hydroxyethyl, ukuqina okuhle kokuqina kanye nokuphikiswa kombuso ngesikhathi sokugcina isikhathi eside. Lungasetshenziswa esikhundleni sezinye izithambiso ze-cellulose.