Ukusetshenziswa nokulungiswa kwe-hydroxyethyl methyl cellulose HEMC

I-Hydroxyethyl methyl cellulose HEMCingasetshenziswa njenge-ejenti yokuvikela i-colloid, i-emulsifier kanye ne-dispersant ngenxa yomsebenzi wayo osebenzayo ebusweni esixazululweni samanzi. Isibonelo sokusetshenziswa kwayo simi kanje: Umphumela we-hydroxyethyl methyl cellulose ezimpahleni zesimende. I-Hydroxyethyl methylcellulose iyimpuphu emhlophe engenaphunga, engenambitheki, engenabuthi encibilika emanzini abandayo ukuze yakhe isixazululo esicacile nesiqinile. Inezakhiwo zokujiya, ukubopha, ukuhlakaza, ukuhlanganisa, ukwakha ifilimu, ukumiswa, ukumunca, ukugaya, ukusebenza ebusweni, ukugcina umswakama nokuvikela ama-colloid. Ngenxa yomsebenzi osebenzayo ebusweni besisombululo samanzi, ingasetshenziswa njenge-ejenti yokuvikela i-colloid, i-emulsifier kanye ne-dispersant. Isixazululo samanzi se-hydroxyethyl methyl cellulose sinomoya omuhle wokusebenzisa amanzi futhi siyi-ejenti yokugcina amanzi esebenza kahle kakhulu.
lungiselela
Indlela yokulungisa i-hydroxyethyl methyl cellulose, le ndlela ihlanganisa ukusebenzisa ukotini ocolisisiwe njengento eluhlaza kanye ne-ethylene oxide njenge-etherifying agent yokulungiselela.i-hydroxyethyl methyl celluloseIzinto zokusetshenziswa zokulungiselela i-hydroxyethyl methyl cellulose zilungiswa ngezingxenye ngesisindo: izingxenye ezingu-700-800 zengxube ye-toluene ne-isopropanol njengesinyibilikisi, izingxenye ezingu-30-40 zamanzi, izingxenye ezingu-70-80 ze-sodium hydroxide, izingxenye ezingu-80-85 zekotini elicwengisisiwe, izingxenye ezingu-20-28 ze-oxythane, izingxenye ezingu-80-90 ze-methyl chloride, kanye nezingxenye ezingu-16-19 ze-glacial acetic acid; izinyathelo ezithile yilezi:

Isinyathelo sokuqala, ku-reactor, engeza ingxube ye-toluene ne-isopropanol, amanzi, kanye ne-sodium hydroxide, ufudumale ufike ku-60 ~ 80 ℃, bese ufakwa e-incubator imizuzu engama-20 ~ 40;

Isinyathelo sesibili, ukwakheka kwe-alkalizing: pholisa izinto ezingenhla ku-30 ​​~ 50℃, engeza ukotini ocolisisiwe, fafaza ingxube ye-toluene ne-isopropanol nge-solvent, susa ku-0.006Mpa, gcwalisa nge-nitrogen ukuze uthole okunye oku-3, bese wenza i-alkali ngemva kokufakwa esikhundleni. Izimo zokwakheka kwe-alkalizing zimi kanje: isikhathi sokwakheka kwe-alkalizing singamahora ama-2, kanti izinga lokushisa lokwakheka kwe-alkalizing lingama-30 °C kuya kuma-50 °C;

Isinyathelo sesithathu, i-etherification: i-alkaliization isiqediwe, i-reactor isuswa iye ku-0.05 ~ 0.07MPa, i-ethylene oxide kanye ne-methyl chloride kuyangezwa, bese kugcinwa imizuzu engama-30 ~ 50; isigaba sokuqala se-etherification: 40 ~ 60℃, ihora eli-1.0 ~ 2.0, ingcindezi ilawulwa phakathi kuka-0.150.3Mpa; isigaba sesibili se-etherification: 60 ~ 90℃, amahora angama-2.0 ~ 2.5, ingcindezi ilawulwa phakathi kuka-0.40.8Mpa;

Isinyathelo sesi-4, ukuncishiswa kwe-acetic: engeza i-glacial acetic acid elinganisiwe kusengaphambili eketheni lokunisela, cindezela ezintweni ezifakwe i-ether ukuze zincishiswe, fudumeza ama-75 ~ 80 ℃ ukuze kunikwe imvula, izinga lokushisa likhuphukela ku-102 ℃, futhi inani le-pH lokuthola lingama-68 Uma ukunisela sekuqediwe, ithangi lokunisela ligcwaliswa ngamanzi ompompi aphathwe yidivayisi ye-reverse osmosis ku-90 ℃ ~ 100 ℃;

Isinyathelo sesihlanu, ukuwasha nge-centrifugal: izinto ezisesigabeni sesine zifakwa nge-centrifuge ngesikulufo esivundlile, bese izinto ezihlukanisiwe zidluliselwa eketheni lokuwasha eligcwele amanzi ashisayo kusengaphambili, bese izinto ziyagezwa;

Isinyathelo sesithupha, ukomisa nge-centrifugal: izinto ezihlanziwe zithuthwa ziyiswe emshinini wokomisa nge-centrifuge yesikulufu esivundlile, izinto zomiswe ku-150-170°C, bese izinto ezomisiwe zigaywe futhi zipakishwe.

Uma kuqhathaniswa ne-ekhonai-cellulose etherNgobuchwepheshe bokukhiqiza, lo mshini osunguliwe usebenzisa i-ethylene oxide njenge-etherifying agent yokulungisa i-hydroxyethyl methyl cellulose, futhi unekhono elihle lokulwa nokuminyana ngoba uqukethe iqembu le-hydroxyethyl, Ukuqina okuhle kwe-viscosity kanye nokumelana nokuminyana ngesikhathi sokugcina isikhathi eside. Ungasetshenziswa esikhundleni sezinye i-cellulose ethers.