Ngwa na nkwadebe nke hydroxyethyl methyl cellulose HEMC

hydroxyethyl methyl cellulose HEMCenwere ike iji ya dị ka ihe nchebe colloid, ihe na-eme ka mmiri dị ọcha, na ihe na-agbasa n'ihi ọrụ ya dị n'elu mmiri. Ihe atụ nke ojiji ya bụ ndị a: Mmetụta nke hydroxyethyl methyl cellulose na ihe onwunwe nke simenti. Hydroxyethyl methylcellulose bụ ntụ ọcha na-enweghị isi, enweghị uto, na-adịghị egbu egbu nke na-agbaze na mmiri oyi iji mepụta ngwọta doro anya, viscous. O nwere ihe onwunwe nke ịka nká, ijikọ, ịgbasa, emulsifying, imepụta ihe nkiri, nkwụsịtụ, ịtinye ihe, gelling, na-arụ ọrụ n'elu, na-ejigide mmiri na ichebe colloids. N'ihi ọrụ dị n'elu mmiri nke mmiri dị ọcha, enwere ike iji ya dị ka ihe nchebe colloid, ihe na-eme ka mmiri dị ọcha na ihe na-agbasa. Mmiri dị n'ime mmiri dị n'ime mmiri dị n'ime mmiri nwere ezigbo hydrophilicity ma bụrụ ihe na-eme ka mmiri dị ọcha nke ọma.
kwadebe
Usoro esi akwadebe hydroxyethyl methyl cellulose, usoro a gụnyere iji owu a nụchara anụcha dị ka ihe eji emepụta ihe na ethylene oxide dị ka ihe na-eme ka ihe dị nro iji kwadebehydroxyethyl methyl celluloseA na-akwadebe ihe ndị e ji emepụta hydroxyethyl methyl cellulose n'akụkụ dị iche iche site na ibu: akụkụ 700-800 nke ngwakọta toluene na isopropanol dị ka ihe mgbaze, akụkụ 30-40 nke mmiri, akụkụ 70-80 nke sodium hydroxide, akụkụ 80-85 nke owu a nụchara anụcha, akụkụ 20-28 nke oxythane, akụkụ 80-90 nke methyl chloride, na akụkụ 16-19 nke glacial acetic acid; usoro ndị a kapịrị ọnụ bụ:

Nzọụkwụ mbụ, n'ime ihe na-eme ka ihe dị n'ime reactor ahụ, tinye ngwakọta toluene na isopropanol, mmiri, na sodium hydroxide, ka ọ na-ekpo ọkụ ruo 60~80°C, tinye ya na mkpuchi maka nkeji 20~40;

Nzọụkwụ nke abụọ, ime ka ihe dị n'elu dị jụụ ruo 30~50℃, tinye owu a nụchara anụcha, fesa ngwakọta nke toluene na isopropanol na ihe mgbaze, wepụ ya na 0.006Mpa, jupụta na nitrogen maka nnọchi atọ, ma mee alkali mgbe edochichara ya. Ọnọdụ ime ka ihe dị n'ime dị ka ndị a: oge ​​ime ka ihe dị n'ime dị bụ awa 2, okpomọkụ ime ka ihe dị n'ime dị site na 30°C ruo 50°C;

Nzọụkwụ nke atọ, etherification: emechara alkalization, a na-ewepụ reactor ahụ ruo 0.05 ~ 0.07MPa, a na-agbakwunye ethylene oxide na methyl chloride, ma debe ya ruo nkeji 30 ~ 50; ogbo mbụ nke etherification: 40 ~ 60℃, awa 1.0 ~ 2.0, a na-achịkwa nrụgide ahụ n'etiti 0.150.3Mpa; ogbo nke abụọ nke etherification: 60 ~ 90℃, awa 2.0 ~ 2.5, a na-achịkwa nrụgide ahụ n'etiti 0.40.8Mpa;

Nzọụkwụ nke anọ, nkewapụ: tinye acetic acid a tụrụ atụ tupu oge eruo na ketulu mmiri ozuzo, pịa ihe etherified maka nkewapụ, kpoo ọkụ 75~80 ℃ iji mee mmiri ozuzo, okpomọkụ na-arị elu ruo 102 ℃, uru pH nchọpụta bụ 68 Mgbe mmiri ozuzo gwụchara, a na-ejupụta tank mmiri ozuzo na mmiri ọkpọkọ nke ngwaọrụ osmosis reverse gwọrọ na 90 ℃~100 ℃;

Nzọụkwụ nke ise, ịsa centrifugal: ihe dị na nzọụkwụ nke anọ ka a na-eji centrifuge skru kwụ ọtọ na-amịnye centrifuge ahụ, a na-ebufekwa ihe kewapụrụ onwe ya na ketulu ịsa ákwà nke e ji mmiri ọkụ jupụta tupu oge eruo, a na-asakwa ihe ahụ;

Nzọụkwụ nke isii, nkụ centrifugal: a na-ebuga ihe a sachara n'ime igwe nkụ site na centrifuge skru kwụ ọtọ, a na-akpọ nkụ ihe ahụ na okpomọkụ 150-170°C, a na-akụchakwa ihe kpọrọ nkụ ma kechie ya.

Ma e jiri ya tụnyere ihe ndị dị adịcellulose etherDịka teknụzụ mmepụta ihe si dị, ihe mepụtara a na-eji ethylene oxide eme ihe dị ka ihe na-eme ka mmiri dị ọcha iji kwadebe hydroxyethyl methyl cellulose, ma nwee ezigbo ikike igbochi mildew n'ihi na o nwere otu hydroxyethyl, ezigbo nkwụsi ike na iguzogide mildew n'oge nchekwa ogologo oge. Enwere ike iji ya kama cellulose ethers ndị ọzọ.