1.Hydroxypropyl methyl cellulose
Hydroxypropyl methylcellulosebụ ụdị cellulose dị iche iche nke mmepụta na oriri ya na-abawanye ngwa ngwa. Ọ bụ ether na-abụghị ionic cellulose agwakọta nke sitere na owu a nụchara anụcha mgbe alkalization, na-eji propylene oxide na methyl chloride dị ka onye na-ahụ maka etherification, site na usoro mmeghachi omume. Ogo nke nnọchi bụ n'ozuzu 1.2 ~ 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, ọ ga-enwekwa ihe isi ike na igbari na mmiri ọkụ. Ma gelation okpomọkụ ya na mmiri ọkụ dị nnọọ elu karịa nke methyl cellulose. A na-emeziwanye ihe solubility na mmiri oyi ma e jiri ya tụnyere methyl cellulose.
(2) (2) Viscosity nke hydroxypropyl methylcellulose na-ejikọta ya na arọ molekụla ya, na ibu ibu molekụla, otú ahụ ka viscosity dị elu. Okpomọkụ na-emetụtakwa viscosity ya, ka okpomọkụ na-abawanye, viscosity na-ebelata. Otú ọ dị, mmetụta nke elu viscosity ya na okpomọkụ dị ala karịa nke methyl cellulose. Ngwọta ya kwụsiri ike mgbe echekwara ya na ụlọ okpomọkụ.
(3) Njide mmiri nke hydroxypropyl methylcellulose na-adabere na ego mgbakwunye ya, viscosity, wdg, na ọnụ ọgụgụ njide mmiri ya n'okpuru otu ihe mgbakwunye ahụ dị elu karịa nke methyl cellulose.
(4) 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 ọnụego mgbasa ya dị ngwa ma mee ka viscosity ya dị ntakịrị. Hydroxypropyl methylcellulose kwụsiri ike na nnu nkịtị, ma mgbe ntinye nke ngwọta nnu dị elu, viscosity nke hydroxypropyl methylcellulose ngwọta na-ebuli elu.
(5) Hydroxypropyl methylcellulose nwere ike ịgwakọta ya na polymers na-agbaze mmiri iji mepụta ihe ngwọta dị n'otu, nke dị elu nke viscosity. Dị ka mmanya polyvinyl, starch ether, chịngọm akwukwo nri, wdg.
(6) Hydroxypropyl methylcellulose nwere nguzogide enzyme dị mma karịa methylcellulose, na ngwọta ya adịkwaghị ka ọ ga-emebi site na enzymes karịa methylcellulose.
(7) Nrapanye nke hydroxypropyl methylcellulose na mgbidi ngwa agha dị elu karịa nke methylcellulose.
2. Hydroxyethyl cellulose
A na-eme ya site na owu a nụchara anụcha na alkali, ma meghachi omume na ethylene oxide dị ka onye na-eme ka etherification n'ihu isopropanol. Ogo nke nnọchi ya n'ozuzu bụ 1.5 ~ 2.0. Ọ nwere hydrophilicity siri ike ma dị mfe ịmịkọrọ mmiri.
(1) Hydroxyethyl cellulose na-agbaze na mmiri oyi, ma ọ na-esiri ike igbari na mmiri ọkụ. Ngwọta ya kwụsiri ike na oke okpomọkụ na-enweghị gelling. Enwere ike iji ya ogologo oge n'okpuru nnukwu okpomọkụ na ngwa agha, mana njide mmiri ya dị ala karịa nke methyl cellulose.
(2)Hydroxyethyl cellulosebụ ike ka izugbe acid na alkali, na alkali nwere ike mee ngwangwa ya mgbasa na ubé dịkwuo ya viscosity. Mgbasa ya na mmiri dị ntakịrị njọ karịa nke methyl cellulose na hydroxypropyl methyl cellulose.
(3) Hydroxyethyl cellulose nwere ezigbo mgbochi sag arụmọrụ maka ngwa agha, ma ọ nwere ogologo oge na-azụ azụ maka ciment.
(4) Arụmọrụ nke hydroxyethyl cellulose nke ụfọdụ ụlọ ọrụ ụlọ na-emepụta dị ala karịa nke methyl cellulose n'ihi nnukwu mmiri na ọdịnaya ntụ dị elu.
(5) Ọkpụkpụ nke ngwọta mmiri nke hydroxyethyl cellulose dị oke njọ. Na okpomọkụ nke ihe dịka 40 Celsius C, mildew nwere ike ime n'ime ụbọchị 3 ruo 5, nke ga-emetụta ọrụ ya.
Oge nzipu: Eprel-28-2024