Cellulose ether bụ ihe mejupụtara polima nke e si na cellulose eke mepụta site na usoro etherification, ọ bụkwa ihe na-eme ka mmiri sie ike ma na-ejide ya nke ọma.
Ndabere Nnyocha
A na-eji ether cellulose eme ihe nke ukwuu n'ime ụrọ akọrọ n'afọ ndị na-adịbeghị anya, ndị a na-ejikarị eme ihe bụ ụfọdụ ether cellulose na-abụghị ionic, gụnyere methyl cellulose ether (MC), hydroxyethyl cellulose ether (HEC), hydroxyethyl cellulose ether Methyl cellulose ether (HEMC) na hydroxypropyl methyl cellulose ether (HPMC). Ugbu a, enweghị ọtụtụ akwụkwọ gbasara usoro nha nke viscosity nke ngwọta cellulose ether. Na mba anyị, naanị ụfọdụ ọkọlọtọ na monographs na-akọwa usoro nnwale nke viscosity nke ngwọta cellulose ether.
Usoro nkwadebe nke ngwọta cellulose ether
Nkwadebe nke Methyl Cellulose Ether Solution
Methyl cellulose ethers na-ezo aka na cellulose ethers nwere otu methyl n'ime molekul ahụ, dịka MC, HEMC na HPMC. N'ihi oke mmiri nke otu methyl, ihe ngwọta cellulose ether nwere otu methyl nwere ihe ndị na-eme ka okpomọkụ dị, ya bụ, ha anaghị agbaze na mmiri ọkụ na okpomọkụ dị elu karịa okpomọkụ gelation ha (ihe dị ka 60-80°C). Iji gbochie ihe ngwọta cellulose ether ịmepụta agglomerates, kpoo mmiri ahụ ọkụ karịa okpomọkụ gel ya, ihe dị ka 80~90°C, wee tinye ntụ ntụ cellulose ether n'ime mmiri ọkụ, kpalie ka ọ gbasaa, nọgide na-akpali ma jụọ oyi. Ruo okpomọkụ edobere, enwere ike ịkwadebe ya ka ọ bụrụ ihe ngwọta cellulose ether otu.
Njirimara mgbaze nke ethers nwere methylcellulose nke a na-agwọghị n'elu
Iji zere njikọta nke cellulose ether n'oge usoro ịgbasa, ndị nrụpụta na-eme ọgwụgwọ elu kemịkalụ na ngwaahịa cellulose ether ntụ ntụ iji gbuo oge ịgbasa. Usoro ịgbasa ya na-eme mgbe emechara ịgbasa cellulose ether kpamkpam, yabụ enwere ike ịgbasa ya ozugbo na mmiri oyi na uru pH na-anọpụ iche na-enweghị ịmepụta agglomerates. Ka uru pH nke ngwọta dị elu, otú ahụ ka oge ịgbasa cellulose ether dị mkpụmkpụ yana njirimara ịgbasa oge. Gbanwee uru pH nke ngwọta ahụ ka ọ bụrụ uru dị elu. Alkalinity ga-ewepụ ike ịgbasa cellulose ether n'oge na-adịghị anya, na-eme ka cellulose ether mepụta agglomerates mgbe ọ na-agbaze. Ya mere, a ga-ebuli ma ọ bụ wedata uru pH nke ngwọta ahụ mgbe emechara ịgbasa cellulose ether kpamkpam.
Njirimara mgbaze nke ethers nwere methylcellulose ejiri mee ihe n'elu
Nkwadebe nke Ngwọta Hydroxyethyl Cellulose Ether
Mmiri Hydroxyethyl cellulose ether (HEC) enweghị ihe onwunwe nke gelation okpomọkụ, ya mere, HEC na-enweghị ọgwụgwọ elu ga-emepụta agglomerates na mmiri ọkụ. Ndị nrụpụta na-emekarị ọgwụgwọ elu kemịkalụ na HEC ntụ ntụ iji kwụsị ịgbaze, ka e wee gbasaa ya ozugbo na mmiri oyi na uru pH na-anọpụ iche na-enweghị ịmepụta agglomerates. N'otu aka ahụ, na mmiri nwere nnukwu alkalinity, HEC Ọ nwekwara ike ịmepụta agglomerates n'ihi mfu mmiri na-egbu oge. Ebe ọ bụ na simenti slurry bụ alkaline mgbe mmiri mịnyere ya na uru pH nke mmiri ahụ dị n'etiti 12 na 13, ọnụego mgbasa nke cellulose ether e ji aka gwọọ n'elu na simenti slurry dịkwa ngwa ngwa.
Njirimara mgbaze nke HEC ejiri mee ihe n'elu
Mmechi na Nyocha
1. Usoro mgbasa
Iji zere mmetụta ọjọọ na oge nnwale ahụ n'ihi na ihe ndị e ji agwọ ọrịa elu na-agbaze nwayọ nwayọ, a na-atụ aro ka e jiri mmiri ọkụ kwadebe ya.
2. Usoro ịjụ oyi
A ga-akpali ma jiri mmiri cellulose ether mee ka ọ dị jụụ n'ọnọdụ okpomọkụ gburugburu iji belata ọsọ oyi, nke chọrọ oge nnwale ogologo.
3. Usoro ịkpalite
Mgbe etinyere cellulose ether n'ime mmiri ọkụ, jide n'aka na ị na-agwakọta ya. Mgbe okpomọkụ mmiri dara n'okpuru okpomọkụ gel, cellulose ether ga-amalite ịgbaze, mmiri ahụ ga-aghọkwa viscous. N'oge a, a ga-ebelata ọsọ mkpali ahụ. Mgbe mmiri ahụ ruru viscosity ụfọdụ, ọ kwesịrị ịnọdụ ala ruo ihe karịrị awa iri tupu afụfụ ahụ eji nwayọọ nwayọọ na-efega n'elu iji gbawaa ma pụọ.
Afụfụ Ikuku na Ngwọta Cellulose Ether
4. Usoro ịgba mmiri mmiri
A ga-enyocha ịdị mma nke cellulose ether na mmiri nke ọma, gbalịa ka ị ghara ichere ka mmiri ahụ ruo oke viscosity tupu i tinyeghachi mmiri.
5. Nnwale viscosity
N'ihi thixotropy nke mmiri cellulose ether, mgbe a na-anwale viscosity ya, mgbe etinyere rotor nke viscometer na-agbagharị agbagharị n'ime mmiri ahụ, ọ ga-akpaghasị mmiri ahụ ma metụta nsonaazụ nha. Ya mere, mgbe etinyere rotor n'ime mmiri ahụ, a ga-ahapụ ya ka ọ nọrọ ruo nkeji ise tupu a nwalee ya.
Oge ozi: Maachị-22-2023