MC bụ methyl cellulose, nke a na-enweta site n'ịgwọ owu a nụchara anụcha na alkali, jiri methyl chloride dị ka ihe na-eme ka ikuku dị ọcha, ma na-eme cellulose ether site na usoro mmeghachi omume. N'ozuzu, ogo nnọchi bụ 1.6~2.0, ihe mgbaze dịkwa iche na ọkwa nnọchi dị iche iche. Ọ bụ nke cellulose ether na-abụghị ionic.
(1) Njide mmiri nkemethyl cellulosedabere na ọnụọgụ mgbakwunye ya, viscosity, ịdị mma nke ihe ndị dị n'ime ya na ọnụego mgbaze. N'ozuzu, ọ bụrụ na ọnụọgụ mgbakwunye buru ibu, ịdị mma ahụ pere mpe, viscosity ahụ buru ibu, ọnụego nchekwa mmiri dị elu. N'ime ha, ọnụọgụ mgbakwunye ahụ nwere mmetụta kachasị ukwuu na ọnụego nchekwa mmiri, ọkwa viscosity adịghịkwa nhata na ọkwa nchekwa mmiri. Ọnụego mgbaze dabere na oke mgbanwe elu nke ihe ndị dị n'ime ya na ịdị mma nke ihe ndị dị n'ime ya. N'ime ihe ndị dị n'ime ya, methyl cellulose na hydroxypropyl methyl cellulose nwere ọnụego nchekwa mmiri dị elu.
(2) Methylcellulose na-agbaze n'ime mmiri oyi, mana ọ na-esiri ike ịgbaze n'ime mmiri ọkụ, mmiri mmiri ya na-adịkwa mma nke ukwuu n'ogo pH = 3 ~ 12. Ọ na-adaba nke ọma na starch, guar gum, wdg. na ọtụtụ surfactants. Mgbe okpomọkụ ruru okpomọkụ gelation, ihe na-eme ka gelation pụta.
(3) Mgbanwe nke okpomọkụ ga-emetụta oke nchekwa mmiri nke methyl cellulose. N'ozuzu, ka okpomọkụ dị elu, otú ahụ ka nchekwa mmiri na-aka njọ. Ọ bụrụ na okpomọkụ moto gafere 40 °C, nchekwa mmiri nke methyl cellulose ga-aka njọ nke ukwuu, nke ga-emetụta ike moto ahụ ịrụ ọrụ nke ukwuu.
(4) Methyl cellulose nwere mmetụta dị ukwuu n'otú e si arụ ọrụ na otú e si ejikọta ihe na ụrọ. "Nrapado" ebe a na-ezo aka na njikọ dị n'etiti ngwa ọrụ onye ọrụ na ihe mkpuchi mgbidi, ya bụ, iguzogide ihe mkpuchi nke ụrọ. Nrapado ahụ buru ibu, iguzogide ihe mkpuchi nke ụrọ ahụ buru ibu, ike ndị ọrụ chọrọ n'usoro ojiji dịkwa ukwuu, owuwu nke ụrọ ahụ adịghịkwa mma. Nrapado Methylcellulose dị n'ọkwa dị ala na ngwaahịa cellulose ether.
HPMC bụ hydroxypropyl methyl cellulose, nke bụ ngwakọta ether cellulose na-abụghị ionic nke e ji owu a nụchara anụcha mee mgbe a gwọchara alkali, na-eji propylene oxide na methyl chloride dị ka ihe na-eme ka ihe ... dị ka ihe na-eme ka ihe dị ka ihe dị ka ihe dị ka ihe na-eme ka ihe dị ka ihe dị ka ihe dị ka ihe na-eme ka ihe dị ka ihe dị ka ihe dị ka ihe dị ka ihe na-eme ka ihe dị ka ihe dị ka ihe dị ka ihe dị ka ihe dị ka ihe dị ka ihe dị ka ihe dị ka ihe dị ka ihe dị ka ihe dị ka ihe dị ka ihe dị ka ihe dị ka ihe dị ka ihe dị ka ihe dị ka ihe dị
(1) Hydroxypropyl methylcellulose na-agbaze ngwa ngwa na mmiri oyi, mana ọ ga-enwe nsogbu mgbe ọ na-agbaze na mmiri ọkụ. Mana okpomọkụ ya na-agbaze na mmiri ọkụ dị elu karịa nke methyl cellulose. A na-emekwa ka mgbaze na mmiri oyi ka mma nke ukwuu ma e jiri ya tụnyere methyl cellulose.
(2) Njupụta nke hydroxypropyl methylcellulose na-adabere na nha nke ibu molekul ya, na ibu nke molekul ka ukwuu, otú ahụ ka viscosity na-abawanye. Okpomọkụ na-emetụtakwa viscosity ya, ka okpomọkụ na-abawanye, viscosity na-ebelata. Mana okpomọkụ dị elu anaghị emetụta viscosity ya karịa methyl cellulose. Ngwọta ya kwụsiri ike na nchekwa na okpomọkụ ụlọ.
(3) Hydroxypropyl methylcellulose kwụsiri ike na acid na alkali, mmiri mmiri ya dịkwa oke mma n'etiti pH = 2 ~ 12. Caustic soda na mmiri lime anaghị enwe mmetụta dị ukwuu na arụmọrụ ya, mana alkali nwere ike ime ka ọ gbazee ngwa ngwa ma mee ka viscosity dịkwuo elu. Hydroxypropyl methylcellulose kwụsiri ike na nnu nkịtị, mana mgbe njupụta nke mmiri nnu dị elu, viscosity nke mmiri hydroxypropyl methylcellulose na-abawanye.
(4) Nchekwa mmiri nkehydroxypropyl methylcellulosedabere na ọnụọgụ mgbakwunye ya, viscosity, wdg. Ọnụego nchekwa mmiri n'okpuru otu ọnụọgụ mgbakwunye ahụ dị elu karịa nke methyl cellulose.
(5) Enwere ike ịgwakọta Hydroxypropyl methylcellulose na ngwakọta polima mmiri na-agbaze iji mepụta ngwọta nwere viscosity dị iche na nke ka elu. Dịka polyvinyl alcohol, starch ether, chịngọm akwụkwọ nri, wdg.
(6) Nrapado nke hydroxypropyl methylcellulose na ihe owuwu ngwa agha dị elu karịa nke methylcellulose.
(7) Hydroxypropyl methylcellulose nwere ike iguzogide enzymes karịa methylcellulose, ohere nke mmebi enzymatic nke ngwọta ya dị ala karịa nke methylcellulose.
Oge ozi: Eprel-28-2024