Ka seretse se omeletseng, cellulose ether e phetha karolo ea ho boloka metsi, ho teteaneng le thixotropy, ho kenya moea le ho fokotsa thepa.Bokhoni bo botle ba ho boloka metsi bo etsa hore hydration ea samente e phethehe haholoanyane, e ka ntlafatsa viscosity e metsi ea seretse se metsi, ea eketsa matla a tlamahano ea seretse, 'me ka seretse sa ceramic bonding se ka eketsa nako ea ho bula le ho fetola nako.Ho eketsa cellulose ether ho seretse sa ho fafatsa ka mochini ho ka ntlafatsa matla a sebopeho sa seretse.Ho itšehla thajana ho ka thibela ho rarolla, ho arohana le stratification, joalo-joalo Ka hona, cellulose ether e sebelisoa haholo ka seretse se omeletseng sa phofo e le tlatsetso ea bohlokoa.E le ho fana ka papali e feletseng ea tšebeliso ea cellulose ether ka seretse se omeletseng se omileng, ho bohlokoa hape ho khetha mofuta oa cellulose ether le ho tseba hore na e sebelisoa hokae.
1. Ho boloka metsi a cellulose ether
①Ha viscosity ea cellulose ether e phahame, e ntlafatsa ts'ebetso ea ho boloka metsi, le viscosity ea tharollo ea polymer.Ho itšetlehile ka boima ba limolek'hule (polymerization degree) ea polymer e boetse e khethoa ke bolelele ba ketane ea sebopeho sa limolek'hule le sebōpeho sa ketane, 'me kabo ea mefuta le bongata ba li-substituents e boetse e ama ka ho toba mefuta ea eona ea viscosity.
②Ha palo e kholo ea cellulose ether e kentsoeng seretseng, e ntlafatsa ts'ebetso ea ho boloka metsi, le viscosity e phahameng, ts'ebetso ea ho boloka metsi e ntlafala.
③ Mabapi le boholo ba karoloana, ha karoloana e le ntle, ho boloka metsi ho betere.Ka mor'a hore likaroloana tse kholo tsa cellulose ether li kopane le metsi, bokaholimo bo qhibiliha hang-hang 'me bo etse gel ho phuthela thepa ho thibela limolek'hule tsa metsi ho kena.Ka linako tse ling e ke ke ea qhalakanngoa ka mokhoa o ts'oanang le ho qhibiliha esita le ka mor'a ho sisinyeha ha nako e telele, ho etsa tharollo e koahetsoeng ke maru kapa agglomeration.E ama haholo ho boloka metsi a cellulose ether, 'me ho qhibiliha ke e' ngoe ea lintlha tsa ho khetha cellulose ether.
2. Thickening le thixotropy ea cellulose ether
Mosebetsi oa bobeli oa cellulose ether - thickening e itšetlehile ka: tekanyo ea polymerization ea cellulose ether, mahloriso a tharollo, sekhahla sa ho kuta, mocheso le maemo a mang.Thepa ea gelling ea tharollo e ikhethile ho alkyl cellulose le lihlahisoa tsa eona tse fetotsoeng.Thepa ea gelation e amana le tekanyo ea ho fetola, mahloriso a tharollo le li-additives.Bakeng sa li-derivatives tse fetotsoeng tsa hydroxyalkyl, thepa ea gel e boetse e amana le boemo ba phetoho ea hydroxyalkyl.Bakeng sa mc le HPMC e nang le viscosity e tlase, tharollo ea mahloriso ea 10% -15% e ka lokisoa, tharollo ea 5% -10% e ka lokisoa bakeng sa viscosity e bohareng mc le HPMC, 'me tharollo ea 2% -3% e ka lokisoa bakeng sa viscosity e phahameng ea mc le HPMC, 'me hangata The viscosity classification ea cellulose ether e boetse e kenngoa ka 1% -2% tharollo.Limolek'hule tse phahameng tsa cellulose ether li na le bokhoni bo phahameng ba ho tiea.Tharollong e tšoanang ea mahloriso, li-polymer tse nang le boima bo fapaneng ba limolek'hule li na le li-viscosity tse fapaneng.Tekanyo e phahameng.Sepheo sa viscosity se ka finyelloa feela ka ho eketsa palo e kholo ea boima bo tlaase ba molek'hule cellulose ether.Viscosity ea eona ha e itšetlehe haholo ka sekhahla sa ho kuta, 'me viscosity e phahameng e fihla ho viscosity e reriloeng,' me palo e hlokahalang ea tlatsetso e nyane, 'me viscosity e ipapisitse le katleho e kholo.Ka hona, ho finyella ts'ebetso e itseng, palo e itseng ea cellulose ether (ho tsepamisa maikutlo ho tharollo) le viscosity ea tharollo e tlameha ho tiisetsoa.Mocheso oa mocheso oa gel oa tharollo o boetse o fokotseha ka mokhoa o ts'oanang le ho eketseha ha motsoako oa tharollo, le li-gel ka mocheso oa motsoako ka mor'a hore li fihle boemong bo itseng.Motsoako oa gelling oa HPMC o phahame mocheso oa kamore.
Ho lumellana ho ka boela ha fetoloa ka ho khetha boholo ba likaroloana le ho khetha li-cellulose ethers tse nang le likhato tse fapaneng tsa phetoho.Seo ho thoeng ke phetoho ke ho hlahisa sehlopha sa hydroxyalkyl ka tekanyo e itseng ea ho fetola sebopeho sa skeleton sa mc.Ka ho fetola litekanyetso tse lekanyelitsoeng tsa phapanyetso ea li-substitute tse peli, ke hore, DS le ms e amanang le phapanyetso ea boleng ba lihlopha tsa methoxy le hydroxyalkyl tseo re li buang hangata.Litlhoko tse fapaneng tsa ts'ebetso ea cellulose ether li ka fumanoa ka ho fetola litekanyetso tse lekanyelitsoeng tsa tse ling tse peli.
Ho eketsoa ha cellulose ether ho ama ts'ebeliso ea metsi ea seretse mme ho fetola karolelano ea metsi ho samente, e leng phello e teteaneng.Ha litekanyetso li phahame, metsi a sebelisoa haholo.
Li-cellulose ethers tse sebelisoang ka thepa ea mohaho ea phofo li tlameha ho qhibiliha ka potlako metsing a batang 'me li fane ka mokhoa o loketseng oa tsamaiso.Haeba ho fanoa ka sekhahla se itseng sa ho kuta, se ntse se fetoha flocculent le colloidal block, e leng sehlahisoa sa boleng bo tlaase kapa se tlaase.
Ho boetse ho na le kamano e ntle pakeng tsa ho lumellana ha pente ea samente le tekanyo ea cellulose ether.Cellulose ether e ka eketsa viscosity ea seretse haholo.Ha tekanyo e le kholoanyane, phello e totobetse haholoanyane.
High-viscosity cellulose ether aqueous solution e na le thixotropy e phahameng, eo hape e leng tšobotsi e kholo ea cellulose ether.Litharollo tsa metsi tsa li-polymer tsa mofuta oa Mc hangata li na le pseudoplastic le non-thixotropic fluidity ka tlase ho mocheso oa tsona oa gel, empa thepa ea Newtonian e phallang ka litekanyetso tse tlaase tsa ho kuta.Pseudoplasticity e eketseha ka boima ba molek'hule kapa bongata ba cellulose ether, ho sa tsotelehe mofuta oa ntho e nkelang sebaka le tekanyo ea ho e nkela sebaka.Ka hona, li-cellulose ethers tsa sehlopha se tšoanang sa viscosity, ho sa tsotellehe hore na mc, HPMC, HEMC, li tla lula li bontša litšobotsi tse tšoanang tsa rheological hafeela mahloriso le mocheso li bolokiloe kamehla.Li-gels tsa mohaho li thehoa ha mocheso o phahama, 'me ho phalla ha thixotropic haholo ho etsahala.Mahloriso a phahameng le a tlaase a viscosity cellulose ethers a bontša thixotropy esita le ka tlase ho mocheso oa gel.Thepa ena e na le molemo o moholo ho lokisoeng ha maemo le ho putlama ha kaho ea seretse sa moaho.Hoa hlokahala ho hlalosa mona hore ho phahama ha viscosity ea cellulose ether, ho boloka metsi ho ntlafala, empa ho phahama ha viscosity, ho phahamisa boima ba molek'hule ea cellulose ether, le ho fokotseha ho tšoanang ha ho qhibiliha ha eona, ho nang le phello e mpe. mabapi le mahloriso a seretse le ts'ebetso ea kaho.Ho phahama ha viscosity, ho totobetse haholoanyane phello e teteaneng holim'a seretse, empa ha e lekane ka ho feletseng.Li-viscosity tse ling tse mahareng le tse tlase, empa cellulose ether e fetotsoeng e na le ts'ebetso e ntle ho ntlafatsa matla a sebopeho sa seretse se metsi.Ka ho eketseha ha viscosity, ho boloka metsi a cellulose ether ho ntlafala.
Nako ea poso: Mar-14-2023