Cellulose ether ke motsoako oa polymer o entsoeng ho tloha selulose ea tlhaho ka mokhoa oa etherification, 'me ke ntho e ntle ka ho fetisisa e teteaneng le e bolokang metsi.
Li-cellulose ethers li 'nile tsa sebelisoa haholo seretseng se omileng se omileng lilemong tsa morao tjena, tse sebelisoang ka ho fetisisa ke tse ling tse seng tsa ionic cellulose ethers, ho akarelletsa le 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 oa viscosity ea tharollo ea cellulose ether. Naheng ea rona, ke litekanyetso le li-monograph tse ling feela tse hlalosang mokhoa oa tlhahlobo oa viscosity ea tharollo ea cellulose ether.
Tokisetso ea Tharollo ea Methyl Cellulose Ether
Methyl cellulose ethers e bua ka cellulose ethers tse nang le lihlopha tsa methyl ka molek'hule, joalo ka MC, HEMC le HPMC. Ka lebaka la hydrophobicity ea sehlopha sa methyl, litharollo tsa cellulose ether tse nang le lihlopha tsa methyl li na le thepa ea gelation ea mocheso, ke hore, ha e qhibilihe metsing a chesang ka mocheso o phahameng ho feta mocheso oa bona oa gelation (hoo e ka bang 60-80 ° C). E le ho thibela tharollo ea cellulose ether ho etsa li-agglomerates, futhumatsa metsi ka holim'a mocheso oa gel, hoo e ka bang 80 ~ 90 ° C, ebe u eketsa phofo ea cellulose ether ka metsing a chesang, hlohlelletsa ho qhala, tsoela pele ho hlohlelletsa le ho pholile ho fihlela sete. mocheso, e ka lokisoa hore e be tharollo e tšoanang ea cellulose ether.
E le ho qoba agglomeration ea cellulose ether nakong ea ho qhibiliha, ka linako tse ling bahlahisi ba etsa phekolo ea lik'hemik'hale holim'a lihlahisoa tsa phofshoana tsa cellulose ether ho lieha ho qhibiliha. Ts'ebetso ea eona ea ho qhibiliha e etsahala ka mor'a hore cellulose ether e qhalane ka ho feletseng, kahoo e ka qhalakanngoa 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 phahame, nako e khuts'oane ea ho qhibiliha ea cellulose ether e nang le thepa e liehang ea ho qhibiliha. Fetola boleng ba pH ba tharollo ho boleng bo holimo. Alkalinity e tla felisa ho lieha ho qhibiliha ha cellulose ether, ho etsa hore cellulose ether e thehe li-agglomerate ha e qhibiliha. Ka hona, boleng ba pH ba tharollo bo lokela ho phahamisoa kapa ho theoleloa ka mor'a hore cellulose ether e qhalane ka ho feletseng.
Tokisetso ea Tharollo ea Hydroxyethyl Cellulose Ether
Tharollo ea Hydroxyethyl cellulose ether (HEC) ha e na thepa ea gelation ea mocheso, ka hona, HEC ntle le phekolo ea holim'a metsi e tla boela e thehe li-agglomerates metsing a chesang. Ka kakaretso bahlahisi ba etsa phekolo ea lik'hemik'hale holim'a HEC e phofshoana ho lieha ho qhibiliha, e le hore e ka qhalakanngoa 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, ka tharollo e nang le alkalinity e phahameng, HEC E ka boela ea theha li-agglomerate ka lebaka la tahlehelo ea solubility e liehang. Kaha slurry ea samente e na le alkaline ka mor'a ho phalla 'me pH ea boleng ba tharollo e pakeng tsa 12 le 13, sekhahla sa ho qhibiliha ha cellulose ether e entsoeng ka holim'a selulo sa samente le eona e potlakile haholo.
Qetello le Tlhahlobo
1. Ts'ebetso ea ho hasana
E le ho qoba liphello tse mpe nakong ea teko ka lebaka la ho qhibiliha butle-butle ha lintho tsa phekolo ea holim'a metsi, ho kgothaletswa ho sebelisa metsi a chesang bakeng sa ho itokisa.
2. Mokhoa o pholileng
Litharollo tsa cellulose ether li lokela ho tsukutloa le ho pholisoa mochesong oa tikoloho ho fokotsa sekhahla sa ho pholisa, se hlokang nako ea teko e atolositsoeng.
3. Ts'ebetso ea ho hlohlelletsa
Ka mor'a hore cellulose ether e kenngoe metsing a chesang, etsa bonnete ba hore u tsoela pele ho susumetsa. Ha mocheso oa metsi o theoha ka tlas'a mocheso oa gel, cellulose ether e tla qala ho qhibiliha, 'me butle-butle tharollo e tla fetoha viscous. Ka nako ena, lebelo la ho sisinyeha le lokela ho fokotseha. Ka mor'a hore tharollo e fihle ho viscosity e itseng, e hloka ho ema lihora tse fetang 10 pele li-bubble li phaphamala butle-butle ho phatloha le ho nyamela.
4. Ts'ebetso ea ho etsa metsi
Boleng ba cellulose ether le metsi bo lokela ho lekanyetsoa ka nepo, 'me u leke ho se emele hore tharollo e fihle ho viscosity e phahameng pele o tlatsa metsi.
5. Teko ea viscosity
Ka lebaka la thixotropy ea tharollo ea cellulose ether, ha ho hlahlojoa viscosity ea eona, ha rotor ea viscometer e potolohang e kenngoa ka tharollo, e tla senya tharollo le ho ama liphello tsa tekanyo. Ka hona, ka mor'a hore rotor e kenngoe ka tharollo, e lokela ho lumelloa ho ema metsotso e 5 pele e hlahlojoa.
Nako ea poso: Feb-24-2023