MC bụ methyl cellulose, nke a na-enweta site n'ịgwọ owu a nụchara anụcha na alkali, na-eji methyl chloride dị ka ihe na-eme ka etherifying, na ime cellulose ether site na usoro mmeghachi omume. N'ozuzu, ogo nke nnọchi bụ 1.6 ~ 2.0, na solubility dịkwa iche na ọkwa dị iche iche nke nnọchi. Nke na-abụghị ionic cellulose ether.
(1) The mmiri njide nkemethyl cellulosena-adabere na ya mgbakwunye ego, viscosity, urughuru fineness na mgbasa ọnụego. N'ozuzu, ọ bụrụ na ọnụ ọgụgụ nke mgbakwunye buru ibu, ịdị mma dị ntakịrị, na viscosity dị ukwuu, ọnụ ọgụgụ njide mmiri dị elu. N'ime ha, ọnụ ọgụgụ nke mgbakwunye na-enwe mmetụta kachasị ukwuu na njide mmiri, na ọkwa nke viscosity adịghị adabere na ọkwa nke njide mmiri. The mgbasa ọnụego tumadi na-adabere n'ókè nke elu mgbanwe nke cellulose ahụ na fineness nke ahụ. N'ime cellulose ethers dị n'elu, methyl cellulose na hydroxypropyl methyl cellulose nwere ọnụ ọgụgụ njide mmiri dị elu.
(2) Methylcellulose bụ soluble na mmiri oyi, ma ọ siri ike igbari na mmiri ọkụ, na mmiri mmiri ngwọta ya bụ nnọọ kwụsiri ike na nso nke pH = 3 ~ 12. Ọ nwere ezigbo ndakọrịta na starch, guar gum, wdg na ọtụtụ surfactants. Mgbe okpomọkụ na-erute okpomọkụ gelation, ihe omume nke gelation na-eme.
(3) Mgbanwe nke okpomọkụ ga-emetụta oke njide mmiri nke methyl cellulose. N'ozuzu, ka okpomọkụ dị elu, na-akawanye njọ njigide mmiri. Ọ bụrụ na okpomọkụ nke ngwa agha gafere 40 Celsius C, njigide mmiri nke methyl cellulose ga-akawanye njọ, nke ga-emetụta oke ọrụ nke ngwa agha ahụ.
(4) Methyl cellulose nwere mmetụta dị ịrịba ama na arụ ọrụ na adhesion nke ngwa agha. “Adhesion” ebe a na-ezo aka na adhesion mmetụta n'etiti ngwa ngwa onye ọrụ na mgbidi, ya bụ, shiee nguzogide nke ngwa agha. Adhesion ahụ buru ibu, nkwụsị nke mgbochi nke ngwa agha dị ukwuu, na ike nke ndị ọrụ na-arụ ọrụ na-arụ ọrụ na-arụkwa ọrụ buru ibu, na-arụkwa ngwa agha adịghị mma. Methylcellulose adhesion nọ n'ọkwa agafeghị oke na ngwaahịa ether cellulose.
HPMC bụ hydroxypropyl methyl cellulose, nke bụ ihe na-abụghị ionic cellulose agwakọta ether mere si nụchara anụcha owu mgbe alkali ọgwụgwọ, na-eji propylene oxide na methyl chloride dị ka etherifying mmadụ, na site a usoro nke mmeghachi omume. Ogo nke nnọchi bụ n'ozuzu 1.2 ka 2.0. Ngwongwo ya na-adịgasị iche dabere n'oke ọdịnaya methoxyl na ọdịnaya hydroxypropyl.
(1) Hydroxypropyl methylcellulose na-adị mfe mgbaze na mmiri oyi, ma ọ ga-ezute ihe isi ike na igbari na mmiri ọkụ. Ma gelation okpomọkụ ya na mmiri ọkụ dị nnọọ elu karịa nke methyl cellulose. Mgbasa na mmiri oyi na-akawanye mma ma e jiri ya tụnyere methyl cellulose.
(2) Viscosity nke hydroxypropyl methylcellulose na-emetụta nha nke ịdị arọ ya, na ibu ibu molekụla, otú ahụ ka viscosity dị elu. Okpomọkụ na-emetụtakwa viscosity ya, ka okpomọkụ na-abawanye, viscosity na-ebelata. Mana viscosity ya adịghị emetụta oke okpomọkụ karịa methyl cellulose. Ihe ngwọta ya kwụsiri ike na nchekwa na ụlọ okpomọkụ.
(3) Hydroxypropyl methylcellulose kwụsiri ike na acid na alkali, na ngwọta mmiri ya kwụsiri ike na pH = 2 ~ 12. Caustic soda na mmiri lime enweghị mmetụta dị nta na arụmọrụ ya, mana alkali nwere ike mee ka mgbasa ya dị ngwa ma mee ka viscosity dịkwuo elu. Hydroxypropyl methylcellulose kwụsiri ike na nnu nkịtị, ma mgbe ntinye nke ngwọta nnu dị elu, viscosity nke hydroxypropyl methylcellulose ngwọta na-emekarị ka ọ dịkwuo elu.
(4) The mmiri njide nkehydroxypropyl methylcellulosedabere na ego mgbakwunye ya, viscosity, wdg. Ọnụego njide mmiri n'okpuru otu ihe mgbakwunye dị elu karịa nke methyl cellulose.
(5) Hydroxypropyl methylcellulose nwere ike ịgwakọta ya na mmiri-soluble polymer ogige na-etolite a ngwọta na edo na elu viscosity. Dị ka mmanya polyvinyl, starch ether, chịngọm akwukwo nri, wdg.
(6) Nrapanye nke hydroxypropyl methylcellulose na mgbidi ngwa agha dị elu karịa nke methylcellulose.
(7).
Oge nzipu: Eprel-28-2024