Cellulose ether bụ ngwakọta polymer nke sitere na cellulose eke sitere na usoro etherification, ma bụrụ ezigbo onye na-ejigide mmiri na mmiri.
Ihe ndabere nyocha
A na-eji cellulose ethers mee ihe na ngwa agha akọrọ akọrọ na afọ ndị na-adịbeghị anya, nke a na-ejikarị eme ihe bụ ụfọdụ ethers 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). Ka ọ dị ugbu a, enweghi ọtụtụ akwụkwọ na usoro nha nke viscosity nke cellulose ether ngwọta. Na mba anyị, naanị ụfọdụ ụkpụrụ na monographs na-akọwapụta usoro nnwale nke viscosity nke cellulose ether ngwọta.
Nkwadebe nke Methyl Cellulose Ether Solution
Methyl cellulose ethers na-ezo aka cellulose ethers nwere methyl otu na molekul, dị ka MC, HEMC na HPMC. N'ihi hydrophobicity nke ìgwè methyl, ihe ngwọta cellulose ether nwere methyl nwere ihe ndị na-ekpo ọkụ na-ekpo ọkụ, ya bụ, ha na-adịghị edozi na mmiri ọkụ na okpomọkụ dị elu karịa gelation okpomọkụ (ihe dị ka 60-80 ° C). Iji gbochie cellulose ether ngwọta site na-akpụ agglomerates, kpoo mmiri ahụ n'elu gel okpomọkụ, ihe dị ka 80 ~ 90 Celsius C, tinyezie ntụ ntụ cellulose ether n'ime mmiri ọkụ, kpalie ịgbasa, nọgide na-akpali akpali ma dị jụụ na setịpụ. okpomọkụ, ọ nwere ike kwadebere n'ime a edo cellulose ether ngwọta.
Iji zere agglomeration nke cellulose ether n'oge usoro mgbasa, ndị na-emepụta mgbe ụfọdụ na-eme ọgwụgwọ elu kemịkalụ na ngwaahịa cellulose ether powdered iji gbuo oge mgbasa. Usoro mgbasa ya na-eme mgbe ether cellulose gbasasịrị kpamkpam, n'ihi ya, enwere ike ịgbasa ya ozugbo na mmiri oyi na uru pH na-anọpụ iche na-enweghị ịmepụta agglomerates. Dị elu pH uru nke ngwọta, nkenke oge mgbasa nke cellulose ether na-egbu oge mgbasa Njirimara. Gbanwee uru pH nke ngwọta na uru dị elu. Alkalinity ga-ewepụ solubility na-egbu oge nke cellulose ether, na-eme ka ether cellulose na-emepụta agglomerates mgbe agbaze. Ya mere, uru pH nke ngwọta kwesịrị ibuli ma ọ bụ wedata mgbe ether cellulose gbasasịrị kpamkpam.
Nkwadebe nke Hydroxyethyl Cellulose Ether Solution
Hydroxyethyl cellulose ether (HEC) ngwọta enweghị ihe onwunwe nke thermal gelation, ya mere, HEC na-enweghị ọgwụgwọ elu ga-etolite agglomerates na mmiri ọkụ. Ndị na-emepụta ihe n'ozuzu na-eme ọgwụgwọ elu kemịkalụ na HEC powdered ka ọ na-egbu oge mgbasa, nke mere na ọ nwere ike gbasaa ozugbo na mmiri oyi na uru pH na-anọpụ iche na-enweghị ịmepụta agglomerates. N'otu aka ahụ, na ngwọta nke nwere nnukwu alkalinity, HEC Ọ nwekwara ike ịmepụta agglomerates n'ihi na-egbu oge solubility ọnwụ. Ebe ọ bụ na ciment slurry bụ alkaline mgbe hydration na pH uru nke ngwọta dị n'etiti 12 na 13, mgbasa ọnụego nke elu-emeso cellulose ether na ciment slurry dịkwa nnọọ ngwa ngwa.
Mmechi na nyocha
1. Usoro mgbasa ozi
Iji zere mmetụta ọjọọ na oge ule n'ihi nkwụsị ngwa ngwa nke ihe ngwọta nke elu, a na-atụ aro iji mmiri ọkụ maka nkwadebe.
2. Usoro jụrụ oyi
Ekwesịrị ịkpali ihe ngwọta cellulose ether ma mee ka ọ dị jụụ na ọnọdụ okpomọkụ iji belata ọnụego jụrụ oyi, nke chọrọ ogologo oge ule.
3. Usoro mkpali
Mgbe agbakwunyere cellulose ether na mmiri ọkụ, jide n'aka na ị na-akpali akpali. Mgbe mmiri mmiri na-adaba n'okpuru okpomọkụ gel, cellulose ether ga-amalite ịgbaze, ngwọta ahụ ga-eji nwayọọ nwayọọ ghọọ viscous. N'oge a, ekwesịrị ibelata ọsọ mkpali. Mgbe ngwọta ahụ ruru ụfọdụ viscosity, ọ ga-adị mkpa ka ọ kwụrụ otu ebe ihe karịrị awa 10 tupu afụ ahụ ji nwayọọ nwayọọ na-ese n'elu elu ka ọ gbawaa wee pụọ.
4. Usoro hydrating
Ekwesịrị ịlele ogo cellulose ether na mmiri n'ụzọ ziri ezi, ma gbalịa ka ị ghara ichere ka ngwọta ahụ ruo elu viscosity dị elu tupu ịmaliteghachi mmiri.
5. Nnwale viscosity
N'ihi thixotropy nke cellulose ether solution, mgbe ị na-anwale viscosity ya, mgbe a na-etinye rotor nke viscometer rotational na ngwọta, ọ ga-akpaghasị ngwọta ahụ ma na-emetụta nsonaazụ nha. Ya mere, mgbe etinyere rotor na ngwọta, a ga-ahapụ ya ka ọ guzoro maka 5 min tupu ule.
Oge nzipu: Feb-08-2023