Methylcellulose (MC) bụ ihe a na-ejikarị emepụta polima nke e ji kemịkalụ mepụta, nke a na-akpọ cellulose ether nke a gbanwere agbanwe nke a na-enweta site na iji methylating eke cellulose. N'ihi ihe pụrụ iche ya na nke kemịkalụ, a na-ejikarị ya eme ihe n'iwu ụlọ, nri, ọgwụ, ihe ịchọ mma, akwụkwọ na ihe mkpuchi.
1. Nhazi site na ogo nke nnọchi
Ogo nke nnọchi (DS) na-ezo aka na nkezi uru nke otu hydroxyl nke otu methyl dochie na nkeji glucose ọ bụla na methylcellulose. E nwere otu hydroxyl atọ na mgbanaka glucose ọ bụla nke molekul cellulose nke otu methyl nwere ike dochie. Ya mere, ogo nke nnọchi nke methylcellulose nwere ike ịdị iche site na 0 ruo 3. Dịka ogo nnọchi si dị, enwere ike kewaa methylcellulose n'ime ụdị abụọ: oke nke nnọchi na obere ogo nke nnọchi.
Oke ogo nke methylcellulose nnọchi (DS > 1.5): Ụdị ngwaahịa a nwere oke ogo nke methyl nnọchi, yabụ ọ na-enwekwu hydrophobic, ọ na-enwe obere mgbaze na ezigbo iguzogide mmiri. A na-ejikarị ya eme ihe n'ihe owuwu ụlọ, mkpuchi na oge ndị ọzọ chọrọ oke hydrophobic.
Obere ogo nke methylcellulose nnọchi (DS < 1.5): N'ihi obere mgbanwe methyl, ụdị ngwaahịa a na-eme ka mmiri dị ọcha karịa, ọ na-agbaze nke ọma ma nwee ike ịgbaze na mmiri oyi. A na-ejikarị methylcellulose nke nwere obere mgbanwe eme ihe n'ọtụtụ ebe na ụlọ ọrụ nri na ọgwụ dị ka ihe na-eme ka ihe sie ike, ihe na-eme ka ihe dị nro na ihe na-eme ka ọ kwụsie ike.
2. Nhazi site na ojiji
Dịka ojiji nke methylcellulose si dị n'ọtụtụ ngalaba dị iche iche, enwere ike kewaa ya ụzọ abụọ: methylcellulose ụlọ ọrụ mmepụta ihe na methylcellulose nri na ọgwụ.
Methylcellulose ụlọ ọrụ mmepụta ihe: A na-ejikarị ya eme ihe n'ihe owuwu, ihe mkpuchi, ime akwụkwọ, seramiiki na ụlọ ọrụ ndị ọzọ dị ka ihe na-eme ka ihe dị arọ, ihe na-arapara, ihe nkiri, ihe na-ejide mmiri, wdg. N'ụlọ ọrụ owuwu ihe, a na-eji methylcellulose eme ihe na ngwaahịa simenti na gypsum iji melite arụmọrụ owuwu na ogologo oge; n'ụlọ ọrụ mkpuchi ihe, methylcellulose nwere ike ime ka nkwụsi ike na mgbasa nke mkpuchi dịkwuo elu.
Nri na ọgwụ methylcellulose: N'ihi na ọ naghị egbu egbu ma na-emerụ ahụ, a na-eji methylcellulose eme ihe dị ka ihe mgbakwunye na nri na ọgwụ. N'ihe gbasara nri, methylcellulose bụ ihe na-eme ka ihe dị arọ ma na-eme ka ihe dị nro nke nwere ike ime ka usoro nri sie ike ma gbochie nhazi ma ọ bụ nkewa; n'ọhịa ọgwụ, enwere ike iji methylcellulose dị ka ihe mkpuchi kapsụl, ihe na-ebu ọgwụ, ma nwee ọrụ nke ọgwụ ndị na-adịgide adịgide. Nri na nchekwa ya na-eme ka methylcellulose bụrụ ihe a ma ama n'ọhịa abụọ a.
3. Nhazi site na mgbaze
A na-ekewa Methylcellulose n'ime ụdị abụọ dịka mmiri oyi si agbaze: ụdị mmiri oyi na ụdị ihe mgbaze organic.
Methylcellulose nke na-agbaze n'ime mmiri oyi: A pụrụ ịgbaze ụdị methylcellulose a na mmiri oyi iji mepụta mmiri doro anya ma dị nro mgbe agbazechara. A na-ejikarị ya eme ihe n'ụlọ ọrụ nri na ọgwụ dị ka ihe na-eme ka ihe sie ike ma ọ bụ ihe nkiri. Mmiri nke ụdị methylcellulose a na-ebelata ka okpomọkụ na-arị elu, yabụ enwere ike iji atụmatụ a maka njikwa ihe owuwu mgbe ejiri ya na ụlọ ọrụ ihe owuwu.
Methylcellulose nke na-agbaze na organic soluble: Ụdị methylcellulose a nwere ike ịgbaze na organic solvents ma a na-ejikarị ya eme ihe na agba, mkpuchi na ngalaba ụlọ ọrụ ndị ọzọ chọrọ organic phase media. N'ihi ezigbo ihe okike ya na-emepụta fim na iguzogide kemịkal, ọ dị mma maka ojiji n'ọnọdụ ụlọ ọrụ siri ike.
4. Nhazi site na ibu molekul (viscosity)
Ibu molekul nke methylcellulose nwere mmetụta dị ukwuu n'ihe ndị dị na ya, ọkachasị arụmọrụ viscosity dị na ngwọta ahụ. Dịka ibu molekul si dị, enwere ike kewaa methylcellulose n'ụdị viscosity dị ala na ụdị viscosity dị elu.
Methylcellulose dị obere: Ibu molekul dị obere ma viscosity nke ngwọta ahụ dị obere. A na-ejikarị ya eme ihe na nri, ọgwụ na ihe ịchọ mma, ọkachasị maka emulsification, nkwụsịtụ na ime ka ọ sie ike. Methylcellulose dị obere nwere ike ịnọgide na-enwe ezigbo mmiri mmiri na otu, ọ dịkwa mma maka ngwa ndị chọrọ ngwọta dị obere.
Methylcellulose dị elu: Ọ nwere nnukwu ibu molekul ma na-emepụta mmiri ọkụ dị elu mgbe agbazechara ya. A na-ejikarị ya eme ihe n'ihe owuwu ụlọ, ihe mkpuchi na ihe mmado ụlọ ọrụ mmepụta ihe. Methylcellulose dị elu nwere ike ime ka ike igwe dịkwuo elu, iguzogide iyi na njikọta nke mmiri ọkụ nke ọma, yabụ a na-ejikarị ya eme ihe n'ihe ndị chọrọ ike dị elu na iguzogide iyi dị elu.
5. Nhazi site na ogo nke mgbanwe kemịkalụ
Methylcellulose bụ ihe e ji kemịkalụ mepụta nke e ji cellulose gbanwee. Dịka usoro na ogo mgbanwe si dị, enwere ike kewaa ya n'ime otu methyl cellulose na otu molecule agbanweela agbanwe.
Otu methyl cellulose: na-ezo aka na cellulose ethers nke naanị methyl-replaced. Ụdị ngwaahịa a nwere ihe onwunwe anụ ahụ na kemịkalụ kwụsiri ike, ihe onwunwe ya na-agbaze, na-eme ka ọ sie ike, na-emepụta ihe nkiri dịkwa mma.
Cellulose agbanwere agbanwe: Na mgbakwunye na methylation, a na-agwọ ya site na kemịkalụ, dịka hydroxypropylation, ethylation, wdg, iji mepụta ngwaahịa agbanwere agbanwe. Dịka ọmụmaatụ, hydroxypropyl methylcellulose (HPMC) na carboxymethyl cellulose (CMC). Cellulose ndị a agbanwere agbanwe na-enwekarị mmiri na-agbaze nke ọma, na-eguzogide okpomọkụ na nkwụsi ike, ma nwee ike ịgbanwe ya ka ọ dabara na mkpa ụlọ ọrụ dị iche iche.
6. Nhazi site na ụlọ ọrụ ngwa
Ojiji methylcellulose sara mbara na-eme ka e kewaa ya dịka njirimara ojiji ya si dị n'ụlọ ọrụ dị iche iche.
Ụlọ ọrụ owuwu methylcellulose: A na-ejikarị ya eme ihe ndị e ji simenti na gypsum mee dị ka ihe na-ejide mmiri ma na-eme ka ihe dị arọ. Ọ nwere ike ime ka ihe owuwu ahụ ka mma, gbochie mmiri ịpụ n'oge, ma mee ka ike igwe nke ngwaahịa emechara dịkwuo elu.
Methylcellulose nke ụlọ ọrụ nri: Dịka ihe na-eme ka mmiri ghara ịpụ apụ, ihe na-eme ka nri sie ike ma na-eme ka ọ sie ike. Ọ nwere ike igbochi mmiri ịpụ apụ, melite ụtọ na nhazi nri, ma mee ka ndụ nri dịkwuo ogologo.
Ụlọ ọrụ ọgwụ methylcellulose: Dịka ihe na-ejikọ mbadamba ma ọ bụ ihe na-adịgide adịgide maka ọgwụ. Enwere ike iji Methylcellulose mee ihe n'ịkwadebe ọgwụ eriri afọ dị ka ihe na-ebu ọgwụ dị mma ma dị irè.
Ụlọ ọrụ ịchọ mma methylcellulose: N'ihe gbasara nlekọta akpụkpọ ahụ na ihe ịchọ mma, a na-eji methylcellulose eme ihe dị ka ihe na-eme ka akpụkpọ ahụ sie ike, ihe na-eme ka ọ dị nro, na ihe na-eme ka ọ dị nro iji nyere aka mepụta udidi dị nro ma dị mma, ebe ọ na-eme ka mmetụta ahụ dị nro dịkwuo ogologo.
Na nchịkọta, e nwere ọtụtụ ụzọ isi kewaa methylcellulose, nke enwere ike kewaa dịka njirimara nhazi kemịkalụ ya si dị, ma ọ bụ dịka ubi ojiji ya na njirimara mgbaze si dị. Ụzọ nhazi dị iche iche ndị a na-enyere anyị aka ịghọta nke ọma njirimara na ọrụ nke methylcellulose, ma nyekwa ntọala echiche maka ojiji ya n'ọhịa dị iche iche.
Oge ozi: Ọktoba-23-2024