MC bụ methyl cellulose, nke e ji cellulose ether mee site n'iji alkali gwọọ owu a nụchara anụcha, jiri methane chloride mee ihe dị ka ihe na-eme ka ikuku dị ọcha, ma na-agafe usoro mmeghachi omume. N'ozuzu, ogo nnọchi bụ 1.6~2.0, ihe na-agbazekwa dịkwa iche na ọkwa nnọchi dị iche iche. Ọ bụ nke cellulose ether na-abụghị ionic.
(1) Njide mmiri nke methyl cellulose dabere na ọnụọgụ mgbakwunye ya, viscosity, ịdị mma nke ihe 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 kpọmkwem na ọkwa nchekwa mmiri. Ọnụego mgbaze dabere na oke mgbanwe elu nke ihe dị n'ime cellulose na ịdị mma nke ihe dị n'ime ya. N'ime ihe ndị dị n'ime cellulose ethers dị n'elu, methyl cellulose na hydroxypropyl methyl cellulose nwere ọnụego nchekwa mmiri dị elu.
(2) Methylcellulose na-agbaze n'ime mmiri oyi, ọ ga-esikwa ike ịgbaze n'ime mmiri ọkụ. Mmiri ya na-agbaze nke ọma na pH = 3 ~ 12. Ọ na-adaba nke ọma na starch, guar gum, wdg. na ọtụtụ surfactants. Mgbe okpomọkụ ruru okpomọkụ gelation, gelation na-eme.
(3) Mgbanwe na 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-ebelata nke ukwuu, nke na-emetụta nnukwu nrụpụta moto ahụ.
(4) Methyl cellulose nwere mmetụta dị ukwuu n'iwuli na njikọta nke ngwa agha. "Nraranye" ebe a na-ezo aka n'ike nraranye dị n'etiti ngwa ọrụ onye ọrụ na ihe mkpuchi mgbidi, ya bụ, nraranye nke ngwa agha. Nraranye dị elu, nraranye nke ngwa agha buru ibu, ike ndị ọrụ chọrọ n'oge ojiji dịkwa ukwuu, arụmọrụ owuwu nke ngwa agha ahụ adịghịkwa mma. Nraranye Methyl cellulose dị n'ọkwa dị ala na ngwaahịa cellulose ether.
HPMC bụ hydroxypropyl methylcellulose, nke bụ ngwakọta ether cellulose na-abụghị ionic nke e ji owu a nụchara anụcha mee mgbe alkalization gasịrị, na-eji propylene oxide na methyl chloride dị ka ihe na-eme ka etherification dị, nakwa site na usoro mmeghachi omume. Ogo nke nnọchi na-abụkarị 1.2~2.0. Àgwà ya dị iche iche n'ihi oke dị iche iche nke ọdịnaya methoxyl na ọdịnaya hydroxypropyl.
(1) Hydroxypropyl methylcellulose na-agbaze ngwa ngwa na mmiri oyi, ọ ga-enwekwa 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 mmiri oyi na-agbaze nke ọma ma e jiri ya tụnyere methyl cellulose.
(2) Ọbara hydroxypropyl methylcellulose na-adabere na ibu molekul ya, na ibu molekul ka ọ na-ebu, otú ahụ ka viscosity ya na-abawanye. Okpomọkụ na-emetụtakwa viscosity ya, ka okpomọkụ na-abawanye, viscosity na-ebelata. Agbanyeghị, viscosity ya dị elu nwere mmetụta okpomọkụ dị ala karịa methyl cellulose. Mmiri ya na-adịgide adịgide mgbe echekwara ya na okpomọkụ ụlọ.
(3) Hydroxypropyl methylcellulose kwụsiri ike na acid na alkali, mmiri mmiri ya na-adịkwa mma nke ukwuu n'ogo 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 ọ gbazee ngwa ngwa. Hydroxypropyl methylcellulose na-adịgide adịgide nye nnu nkịtị, mana mgbe njupụta nke mmiri nnu dị elu, njupụta nke mmiri hydroxypropyl methylcellulose na-abawanye.
(4) Njide mmiri nke hydroxypropyl methylcellulose dabere na ọnụọgụ mgbakwunye ya, viscosity, wdg, na ọnụego njigide mmiri ya 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 viscosity dị otu ma dị 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 enzyme karịa methylcellulose, ọ dịghịkwa ka enzymes ga-emebi mmiri ya karịa methylcellulose.
Oge ozi: Eprel-17-2023