Cellulose ether ke motsoako oa polymer o entsoeng ka cellulose ea tlhaho ka mokhoa oa etherification, 'me ke sesebelisoa se setle sa ho tenya le ho boloka metsi.
Semelo sa Lipatlisiso
Li-ether tsa cellulose li 'nile tsa sebelisoa haholo ka har'a seretse se tsoakiloeng ka omileng lilemong tsa morao tjena, tse sebelisoang haholo ke li-ether tse ling tsa cellulose tse seng tsa ionic, ho kenyeletsoa methyl cellulose ether (MC), hydroxyethyl cellulose ether (HEC), hydroxyethyl cellulose ether Methyl cellulose ether (HEMC) le hydroxypropyl methyl cellulose ether (HPMC). Hona joale, ha ho na lingoliloeng tse ngata mabapi le mokhoa oa ho lekanya viscosity ea tharollo ea ether ea cellulose. Naheng ea rona, ke litekanyetso le li-monograph tse ling feela tse hlalosang mokhoa oa teko ea viscosity ea tharollo ea ether ea cellulose.
Mokhoa oa ho lokisa tharollo ea ether ea cellulose
Ho Lokisetsa Tharollo ea Methyl Cellulose Ether
Li-ether tsa methyl cellulose li bua ka li-ether tsa cellulose tse nang le lihlopha tsa methyl molek'huleng, tse kang MC, HEMC le HPMC. Ka lebaka la ho se kopane ha metsi ha sehlopha sa methyl, litharollo tsa ether tsa cellulose tse nang le lihlopha tsa methyl li na le thepa ea ho futhumatsa, ke hore, ha li qhibilihe ka metsing a chesang mochesong o phahameng ho feta mocheso oa tsona oa ho futhumatsa (hoo e ka bang 60-80°C). E le ho thibela tharollo ea ether ea cellulose ho etsa li-agglomerate, futhumatsa metsi ka holim'a mocheso oa eona oa gel, hoo e ka bang 80~90°C, ebe u eketsa phofo ea ether ea cellulose ka metsing a chesang, u hlohlelletse ho hasana, u tsoele pele ho hlohlelletsa le ho phola Ho fihlela mochesong o behiloeng, e ka lokisoa hore e be tharollo ea ether ea cellulose e tšoanang.
Thepa ea ho qhibiliha ha li-ether tse nang le methylcellulose tse sa phekoloang holim'a metsi
E le ho qoba ho kopana ha ether ea cellulose nakong ea ts'ebetso ea ho qhibiliha, bahlahisi ka linako tse ling ba etsa kalafo ea lik'hemik'hale holim'a lihlahisoa tsa ether ea cellulose e phofshoana ho liehisa ho qhibiliha. Ts'ebetso ea ho qhibiliha ha eona e etsahala ka mor'a hore ether ea cellulose e hasane ka botlalo, kahoo e ka hasoa ka ho toba metsing a batang ka boleng ba pH bo sa nke lehlakore ntle le ho etsa li-agglomerate. Ha boleng ba pH ba tharollo bo le holimo, nako ea ho qhibiliha ha ether ea cellulose e nang le litšobotsi tsa ho qhibiliha tse liehang e tla ba khutšoanyane. Fetola boleng ba pH ba tharollo ho ea boleng bo holimo. Alkalinity e tla felisa ho qhibiliha ho liehang ha ether ea cellulose, e leng se etsang hore ether ea cellulose e thehe li-agglomerate ha e qhibiliha. Ka hona, boleng ba pH ba tharollo bo lokela ho phahamisoa kapa ho theoloa ka mor'a hore ether ea cellulose e hasane ka botlalo.
Litšobotsi tsa ho qhibiliha ha li-ether tse nang le methylcellulose tse phekotsoeng holim'a metsi
Ho Lokisetsa Tharollo ea Hydroxyethyl Cellulose Ether
Tharollo ea Hydroxyethyl cellulose ether (HEC) ha e na thepa ea gelation ea mocheso, ka hona, HEC ntle le kalafo ea bokaholimo e tla boela e thehe li-agglomerate ka metsing a chesang. Bahlahisi ka kakaretso ba etsa kalafo ea lik'hemik'hale holim'a HEC e phofshoana ho liehisa ho qhibiliha, e le hore e ka hasoa ka ho toba metsing a batang ka boleng ba pH bo sa nke lehlakore ntle le ho etsa li-agglomerate. Ka mokhoa o ts'oanang, tharollong e nang le alkalinity e phahameng, HEC E ka boela ea etsa li-agglomerate ka lebaka la tahlehelo e liehang ea ho qhibiliha. Kaha slurry ea samente ke alkaline kamora ho nosetsa 'me boleng ba pH ba tharollo bo pakeng tsa 12 le 13, sekhahla sa ho qhibiliha ha ether ea cellulose e phekotsoeng bokaholimong ba slurry ea samente le sona se potlakile haholo.
Thepa ea ho qhibiliha ha HEC e phekoloang holim'a metsi
Qetello le Tlhahlobo
1. Ts'ebetso ea ho hasana
E le ho qoba litlamorao tse mpe nakong ea teko ka lebaka la ho qhibiliha butle ha lintho tse sebelisoang holim'a metsi, ho kgothaletswa ho sebelisa metsi a chesang bakeng sa ho lokisa.
2. Ts'ebetso ea ho pholisa
Litharollo tsa ether ea cellulose li lokela ho hlohlelletsoa le ho pholisoa mochesong o tloaelehileng ho fokotsa sekhahla sa ho pholisa, se hlokang linako tse telele tsa teko.
3. Ts'ebetso ea ho hlohlelletsa
Kamora hore ether ea cellulose e eketsoe metsing a chesang, etsa bonnete ba hore u lula u hlohlelletsa. Ha mocheso oa metsi o theohela ka tlase ho mocheso oa gel, ether ea cellulose e tla qala ho qhibiliha, 'me tharollo e tla ba e teteaneng butle-butle. Nakong ena, lebelo la ho hlohlelletsa le lokela ho fokotseha. Kamora hore tharollo e fihle ho viscosity e itseng, e hloka ho ema e sa sisinyehe lihora tse fetang 10 pele lipululana li phaphamala butle-butle holim'a metsi ho phatloha le ho nyamela.
Lipululana tsa Moea ka Tharollong ea Ether ea Cellulose
4. Ts'ebetso ea ho nosetsa
Boleng ba ether ea cellulose le metsi bo lokela ho lekanngoa ka nepo, 'me u leke ho se emele hore tharollo e fihle ho viscosity e phahameng pele u tlatsa metsi hape.
5. Teko ea ho teteana
Ka lebaka la thixotropy ea tharollo ea ether ea cellulose, ha ho lekoa viscosity ea eona, ha rotor ea viscometer e potolohang e kenngoa ka har'a tharollo, e tla sitisa tharollo 'me e ame liphetho tsa tekanyo. Ka hona, kamora hore rotor e kenngoe ka har'a tharollo, e lokela ho lumelloa ho ema metsotso e 5 pele e lekoa.
Nako ea poso: Hlakubele-22-2023