Ogo nke Hydroxypropyl Methyl Cellulose

A na-anụcha hydroxypropyl methylcellulose site na owu mgbe alkalization, na-eji propylene oxide na methyl chloride dị ka etherification agents, ma na-enweta usoro mmeghachi omume iji mepụta cellulose na-abụghị ionic ether. Hydroxypropyl methylcellulose bụ ether cellulose na-abụghị ionic, na-acha ọcha n'ọdịdị, enweghị isi na enweghị ụtọ. Ogo nke nnọchi bụ n'ozuzu . Ngwongwo ya na-adịgasị iche dabere n'oke ọdịnaya methoxyl na ọdịnaya hydroxypropyl.

Nke mbụ, buru ụzọ leba anya na njikọ nke hydroxypropyl methylcellulose:

A na-emeso cellulose owu a nụchara anụcha na ngwọta alkali na 35-40 ° C maka ọkara otu awa, pịa ya, a na-akụkwa cellulose ahụ na 35 Celsius ma mee agadi nke ọma, nke mere na nkezi ogo nke polymerization nke alkali fiber nwetara dị n'ime. oke chọrọ. Tinye eriri alkali n'ime tank nke etherification, tinye propylene oxide na methyl chloride n'usoro, etherify na 50-80 ° C maka awa 5, na nrụgide kachasị dị ihe dị ka. Mgbe ahụ tinye ihe kwesịrị ekwesị nke hydrochloric acid na oxalic acid na mmiri ọkụ na 90 Celsius iji gbasaa olu. Wepu mmiri n'ime centrifuge. Mgbe mmiri dị n'ime ihe ahụ dị ala karịa 60%, sachaa ya ka ọ ghara ịnọpụ iche, wee kpoo ya n'okpuru 5% na ikuku na-ekpo ọkụ na 130 ° C. N'ikpeazụ, kụrie ya na sieve 20 mesh iji nweta ngwaahịa emechara.

Njirimara ngwaahịa nke Hydroxypropyl Methyl Cellulose:

1. Hydroxypropyl methylcellulose dị mfe soluble na mmiri oyi ga-agbaze na mmiri ọkụ. Otú ọ dị, okpomọkụ gelation ya na mmiri ọkụ dị elu nke ukwuu karịa nke methylcellulose. Mgbasa na mmiri oyi na-akawanyekwa mma karịa methyl cellulose.

2. Viscosity nke hydroxypropyl methylcellulose metụtara ịdị arọ molekụla, na viscosity dị elu mgbe ịdị arọ molecular buru ibu. Okpomọkụ na-emetụtakwa viscosity ya, ka okpomọkụ na-abawanye, viscosity na-ebelata. Ma nnukwu viscosity ya dị ala karịa methyl cellulose. Ihe ngwọta ya kwụsiri ike na ụlọ okpomọkụ.

Ike njide mmiri nke hydroxypropyl methylcellulose na-adabere na ego mgbakwunye ya, viscosity, wdg, na ọnụ ọgụgụ njide mmiri ya dị elu karịa nke methyl cellulose.

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 akụrụngwa ya, mana alkali nwere ike mee ka mgbasa ya dịkwuo elu ma na-abawanye viscosity ya ntakịrị. 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. Hydroxypropyl methylcellulose nwere ike ịgwakọta ya na polymers soluble mmiri na-emepụta otu otu, ngwọta viscosity dị elu. Dị ka mmanya polyvinyl, ọdọ mmiri ntụ ntụ ether, chịngọm akwukwo nri, wdg.

Hydroxypropyl methylcellulose nwere nguzogide enzyme dị mma karịa methylcellulose, na ngwọta ya adịkwaghị ka ọ ga-emebi enzymatically karịa methylcellulose.

5. Adhesion n'etiti hydroxypropyl methylcellulose na ngwa agha Ọdịdị dị elu karịa nke methylcellulose.

Ngwakọta mmiri a na-agwakọta mmiri bụ ciment, nchịkọta dị mma, ihe mgbakwunye na mmiri, na ihe dị iche iche na-ekpebi dịka arụmọrụ si dị. Mgbe a tụlechara ngwakọta ahụ ma gwakọta ya n'otu akụkụ na ọdụ ebe a na-agwakọta ihe, a na-ebuga ngwakọta ahụ n'ebe a na-eji gwongworo na-ejikọta ya ma chekwaa ya n'ime akpa pụrụ iche, a na-eji mmiri mmiri eme ihe n'ime oge a kapịrị ọnụ.

Kedu otu esi ekpe ikpe ogo hydroxypropyl methylcellulose?

Ikpe ikpe ogo hydroxypropyl methylcellulose dabere na ihe ngosi abụọ, otu bụ ogo nnọchi (DS) na nke ọzọ bụ ịdị ọcha. N'ozuzu, ihe onwunwe nke carboxymethyl cellulose dị iche iche ma ọ bụrụ na ogo nke nnọchi dị iche; ọkwa dị elu nke ngbanwe, otú ahụ ka ike na-esiwanye ike, na mma nghọta na nkwụsi ike nke ngwọta. Dị ka akụkọ ndị dị mkpa si kwuo, nghọta nke carboxymethyl cellulose dị mma mgbe ogo ngbanwe bụ ~, na viscosity nke ngwọta mmiri ya dị elu mgbe uru pH dị 6-9. Nke ahụ bụ, iji tụọ àgwà carboxymethyl cellulose, ọ dị mkpa inwe ezi nghọta nke ogo nke nnọchi na ịdị ọcha ya. Ihe ngosi abụọ a na-emezu ihe ndị a chọrọ, nke pụtara na àgwà ya dị ezigbo mma.