Kedu ihe ndị dị na hydroxypropyl methyl cellulose na hydroxyethyl cellulose?

1. Hydroxypropyl methyl cellulose

Hydroxypropyl methylcellulosebụ ụdị cellulose nke mmepụta na oriri ya na-amụba ngwa ngwa. Ọ bụ ngwakọta nke 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, site na usoro mmeghachi omume. Ogo nke nnọchi na-abụkarị 1.2~2.0. Njirimara ya dị iche iche dabere na oke 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) (2) Ọbara hydroxypropyl methylcellulose na-ejikọta ya na ibu molekul ya, ka ibu molekul ahụ na-ebu ibu, otú ahụ ka viscosity ahụ na-abawanye. Okpomọkụ na-emetụtakwa viscosity ya, ka okpomọkụ na-abawanye, viscosity na-ebelata. Agbanyeghị, mmetụta nke viscosity na okpomọkụ ya dị ala karịa nke methyl cellulose. Mmiri ya na-adịgide adịgide mgbe echekwara ya na okpomọkụ ụlọ.

(3) 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.

(4) 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 ọsọ ya dị ngwa ngwa ma mee ka ọ dịkwuo ntakịrị. Hydroxypropyl methylcellulose kwụsiri ike na nnu nkịtị, mana mgbe njupụta nke mmiri nnu dị elu, viscosity nke mmiri hydroxypropyl methylcellulose na-abawanye.

(5) Enwere ike ịgwakọta Hydroxypropyl methylcellulose na polima ndị na-agbaze mmiri iji mepụta ihe ngwọta yiri nke ahụ, nke nwere oke viscosity. Dịka polyvinyl alcohol, starch ether, chịngọm akwụkwọ nri, wdg.

(6) Hydroxypropyl methylcellulose nwere ike iguzogide enzyme karịa methylcellulose, ọ dịghịkwa ka enzymes ga-emebi mmiri ya karịa methylcellulose.

(7) Nrapado nke hydroxypropyl methylcellulose na ihe owuwu ngwa agha dị elu karịa nke methylcellulose.

2. Haịdroxyethyl cellulose

A na-eji owu a gwakọtara agwakọta nke e ji alkali mee ya, a na-ejikwa ethylene oxide emeghachi omume dị ka ihe na-eme ka etherification dị na ya ma ọ bụrụ na isopropanol dị. Ọkwa nnọchi ya na-abụkarị 1.5-2.0. Ọ nwere hydrophilicity siri ike ma dịkwa mfe ịmịkọrọ mmiri.

(1) A na-agbaze Hydroxyethyl cellulose na mmiri oyi, mana ọ na-esiri ike ịgbaze na mmiri ọkụ. Mmiri ya na-adịgide adịgide na okpomọkụ dị elu na-enweghị gelling. Enwere ike iji ya ruo ogologo oge n'okpuru okpomọkụ dị elu na moto, mana mmiri ya dị ala karịa nke methyl cellulose.

(2)hydroxyethyl celluloseọ na-adịgide adịgide na asịd na alkali nkịtị, alkali nwekwara ike ime ka ọ gbazee ngwa ngwa ma mee ka ọ dịkwuo mma. Ọ na-agbaze n'ime mmiri dịtụ njọ karịa nke methyl cellulose na hydroxypropyl methyl cellulose.

(3) Hydroxyethyl cellulose nwere ezigbo ọrụ mgbochi sag maka ngwa agha, mana ọ na-ewe oge dị ogologo maka simenti.

(4) Arụmọrụ nke hydroxyethyl cellulose nke ụfọdụ ụlọ ọrụ obodo na-emepụta doro anya dị ala karịa nke methyl cellulose n'ihi nnukwu mmiri na oke ntụ ya.

(5) Mbufụt nke mmiri mmiri nke hydroxyethyl cellulose dị oke njọ. N'ọnọdụ okpomọkụ dị ihe dị ka 40°C, mildew nwere ike ịpụta n'ime ụbọchị 3 ruo 5, nke ga-emetụta arụmọrụ ya.