Phello e matla ea cellulose ether 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 viscosity tlaase MC le HPMC, 10% -15% tharollo ka lokisoa, mahareng viscosity MC le HPMC ka lokisoa 5% -10% tharollo, le phahameng viscosity MC le HPMC ka feela lokisetsa 2% -3% tharollo, 'me hangata. sehlopha sa viscosity ea cellulose ether e boetse e hlophisitsoe ka tharollo ea 1% -2%.
Ether ea cellulose e boima bo phahameng ba molek'hule e na le ts'ebetso e phahameng ea ho tenya, 'me li-polymer tse nang le boima bo fapaneng ba limolek'hule li na le li-viscosity tse fapaneng tharollong e tšoanang ea mahloriso.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, viscosity e phahameng e fihla ho viscosity e reriloeng, 'me palo e hlokahalang ea tlatsetso e nyane, mme viscosity e ipapisitse le katleho e kholo.Ka hona, ho finyella ts'ebetsong e itseng, palo e itseng ea cellulose ether (ho tsepamisa maikutlo ho tharollo) le viscosity ea tharollo e tlameha ho netefatsoa.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 kamore ka mor'a ho fihla mahloriso a itseng.Motsoako oa gelling oa HPMC o batla 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 tekanyo e itseng ea ho fetola lihlopha tsa hydroxyalkyl holim'a 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 atisang ho li bua.Litlhoko tse fapaneng tsa ts'ebetso ea cellulose ether li ka fumanoa ka ho fetola litekanyetso tse amanang le tse ling tse peli.
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-polymers tsa MC hangata li na le pseudoplastic le non-thixotropic fluidity ka tlase ho mocheso oa bona 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-20-2023