Ngwa na nkwadebe nke hydroxyethyl methyl cellulose HEMC

Hydroxyethyl methyl cellulose HEMCenwere ike iji ya dị ka onye na-echebe colloid, emulsifier na dispersant n'ihi ọrụ elu ya na-arụ ọrụ na ngwọta mmiri. Ihe atụ nke ngwa ya bụ nke a: Mmetụta nke hydroxyethyl methyl cellulose na njirimara nke ciment. Hydroxyethyl methylcellulose bụ ntụ ọcha na-adịghị na-esi ísì, nke na-adịghị egbu egbu nke na-agbaze n'ime mmiri oyi iji mepụta ngwọta doro anya na nke viscous. Ọ nwere Njirimara nke ndim, njide, na-achụsasị, emulsifying, film-akpụ, suspending, adsorbing, gelling, elu-arụ ọrụ, na-ejigide mmiri na-echebe colloid. N'ihi ọrụ na-arụ ọrụ elu nke ngwọta mmiri, enwere ike iji ya dị ka onye na-echebe colloid, emulsifier na onye na-ekesa. Hydroxyethyl methyl cellulose ngwọta aqueous nwere ezigbo hydrophilicity na ọ bụ ihe na-arụ ọrụ nke ọma na-ejigide mmiri.
kwadebe
Usoro maka ịkwadebe hydroxyethyl methyl cellulose, usoro a gụnyere iji owu a nụchara anụcha dị ka akụrụngwa na ethylene oxide dị ka onye na-emepụta ihe iji kwadebe.hydroxyethyl methyl cellulose. A na-akwadebe akụrụngwa maka ịkwadebe hydroxyethyl methyl cellulose na akụkụ dị arọ: akụkụ 700-800 nke ngwakọta nke toluene na isopropanol dị ka ihe mgbaze, 30-40 mmiri, 70-80 akụkụ sodium hydroxide, 80-85 akụkụ. owu a nụchara anụcha, akụkụ 20-28 nke oxyethane, akụkụ 80-90 nke methyl chloride, na 16-19 akụkụ nke glacial acetic acid; usoro ndị a kapịrị ọnụ bụ:

Nzọụkwụ mbụ, na reactor, tinye toluene na isopropanol ngwakọta, mmiri na sodium hydroxide, na-ekpo ọkụ ruo 60 ~ 80 ℃, na-incubated 20-40 nkeji;

Nzọụkwụ nke abụọ, alkalization: mee ka ihe ndị dị n'elu dị jụụ ruo 30 ~ 50 ℃, gbakwunye owu a nụchara anụcha, fesaa ngwakọta nke toluene na isopropanol na ihe mgbaze, wepụ ya na 0.006Mpa, jupụta na nitrogen maka nnọchi 3, wee mee alkali mgbe dochie ya. ọnọdụ dị ka ndị a: oge ​​alkalization bụ awa 2, na alkalization okpomọkụ bụ 30 ° C ruo 50 ° C;

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

Nzọụkwụ 4th, neutralization: tinye metered glacial acetic acid tupu oge eruo na kettle mmiri ozuzo, pịa n'ime ihe etherified maka neutralization, kpoo 75 ~ 80 ℃ iji mee mmiri ozuzo, okpomọkụ na-ebili na 102 ℃, na nchọpụta pH uru bụ. 68 Mgbe oke mmiri ozuzo gwụchara, tankị mmiri ozuzo na-ejupụta na mmiri mgbata nke ntụgharị osmosis na-edozi. ngwaọrụ na 90 ℃～100 ℃;

Nzọụkwụ nke ise, ịsacha centrifugal: ihe dị na nzọụkwụ nke anọ bụ ihe na-eme ka ọ bụrụ ihe na-eme ka ọkpụkpụ kwụ ọtọ, a na-ebufekwa ihe ndị ahụ kewapụrụ na kettle ịsacha nke jupụtara na mmiri ọkụ tupu oge eruo, a na-asachakwa ihe ahụ;

Nzọụkwụ nke isii, ihicha centrifugal: a na-ebufe ihe ndị a na-asacha n'ime igwe na-ekpo ọkụ site na centrifuge screw centrifuge, ihe a na-akpọnwụ na 150-170 ° C, na ihe a mịrị amị na-akpụ akpụ na ngwugwu.

Tụnyere ihe dị adịcellulose ethermmepụta technology, ugbu a mepụtara adopts ethylene oxide dị ka etherifying gị n'ụlọnga iji kwadebe hydroxyethyl methyl cellulose, na nwere ezi mgbochi mildew ikike n'ihi na ọ nwere hydroxyethyl otu, Ezi viscosity kwụsie ike na mildew iguzogide n'oge ogologo oge nchekwa. Enwere ike iji ya mee ihe kama ethers cellulose ndị ọzọ.