Ka seretse se seng se kopantsoe, ke ether e nyane feela ea cellulose e ka ntlafatsang haholo ts'ebetso ea seretse se metsi. Ho ka bonoa hore cellulose ether ke motsoako o ka sehloohong o amang ts'ebetso ea ho sebetsa ea seretse.
Ho khetha mefuta e fapaneng ea li-cellulose ethers tse nang le li-viscosity tse fapaneng, boholo bo fapaneng ba likaroloana, likhato tse fapaneng tsa viscosity le lipalo tse ekelitsoeng le tsona li tla ba le litlamorao tse fapaneng ntlafatsong ea ts'ebetso ea seretse sa drymix. Hajoale, litene tse ngata tsa masonry le plastering li na le ts'ebetso e mpe ea ho boloka metsi. Metsi le slurry li tla arohana ka mor'a metsotso e seng mekae ea ho ema. Kahoo ho bohlokoa haholo ho eketsa cellulose ether ho seretse sa samente.
Ha re shebisiseng karolo ea cellulose ether seretseng sa samente!
1. Cellulose ether-- Ho boloka metsi
Ho boloka metsi ke ts'ebetso ea bohlokoa ea methyl cellulose ether, hape ke ts'ebetso eo bahlahisi ba bangata ba seretse sa motswako o omileng malapeng, haholo-holo ba libakeng tse ka boroa tse nang le mocheso o phahameng o elang hloko. Ha ho etsoa thepa ea ho haha, haholo-holo phofo e omeletseng ea seretse, cellulose ether e phetha karolo e ke keng ea nkeloa sebaka, haholo-holo tlhahiso ea seretse se khethehileng (seretse se fetotsoeng), ke karolo ea bohlokoa le ea bohlokoa.
Viscosity, litekanyetso, mocheso le sebopeho sa limolek'hule tsa cellulose ether li na le tšusumetso e kholo ts'ebetsong ea eona ea ho boloka metsi. Tlas'a maemo a tšoanang, ho ba le viscosity e kholo ea cellulose ether, ho boloka metsi ho molemo; Ha litekanyetso li phahame, ho boloka metsi ho betere. Hangata, tekanyo e nyane ea cellulose ether e ka ntlafatsa haholo ho boloka metsi a seretse. Ha tekanyo e fihla ho e itseng, ha tekanyo ea ho boloka metsi e eketseha, mokhoa oa ho boloka metsi o fokotseha; Ha mocheso oa tikoloho o phahama, ho bolokoa ha metsi a cellulose ether hangata hoa fokotseha. Empa li-ether tse ling tse fetotsoeng tsa cellulose li boetse li na le ho boloka metsi ho molemo tlas'a maemo a phahameng a mocheso; Cellulose ether e nang le likhato tse tlase tsa phallo e na le ts'ebetso e ntle ea ho boloka metsi.
Sehlopha sa hydroxyl ka molek'hule ea ether ea cellulose le athomo ea oksijene holim'a tlamahano ea ether e tla amahanngoa le molek'hule ea metsi ho etsa tlamo ea hydrogen, ho fetola metsi a mahala hore e be metsi a tlamiloeng, kahoo a bapala karolo e ntle ea ho boloka metsi;Themolek'hule ea metsi le cellulose ether molecular chain Interdiffusion e lumella limolek'hule tsa metsi hore li kene ka hare ho ketane ea cellulose ether macromolecular 'me e tlas'a matla a matla a tlamang, kahoo a etsa metsi a sa lefelloeng, metsi a ferekaneng, le ho ntlafatsa ho boloka metsi a samente slurry; Cellulose ether e ntlafatsa thepa ea rheological ea samente e ncha, sebopeho sa marang-rang a porous le khatello ea osmotic kapa thepa ea ho etsa filimi ea cellulose ether e sitisa ho hasana ha metsi.
2. Cellulose ethers - Thickening le Thixotropy
Cellulose ether e fana ka seretse se metsi ka viscosity e babatsehang, e ka eketsang haholo bokhoni ba ho kopanya pakeng tsa seretse se metsi le lera la motheo, le ho ntlafatsa ts'ebetso ea anti-sag ea seretse. E sebelisoa haholo bakeng sa seretse sa plastering, seretse se kopanyang litene le sistimi ea ho kenya lebota kantle. Phello e matla ea cellulose ether e ka boela ea eketsa bokhoni ba ho thibela ho hasana le homogeneity ea lisebelisoa tse sa tsoa tsoakoa, ho thibela ho senyeha ha lintho le ho arohana. E ka sebelisoa ka konkreite ea fiber, konkreite e ka tlas'a metsi le konkreite e iketsetsang.
Phello e matla ea cellulose ether linthong tse thehiloeng ho samente e tsoa ho viscosity ea tharollo ea cellulose ether. Tlas'a maemo a ts'oanang, ho phahama ha viscosity ea cellulose ether, ho tla ba betere ho ba le viscosity ea thepa e fetotsoeng ea samente, empa haeba viscosity e phahame haholo, e tla ama ho phalla le ho sebetsa ha thepa (e kang ho khomarela thipa ea plastering. ). Seretse se ikemetseng le konkreite e ikemetseng, e hlokang metsi a mangata, e hloka viscosity e tlase ea cellulose ether. Ho phaella moo, phello e matla ea cellulose ether e tla eketsa tlhokahalo ea metsi ea thepa e thehiloeng ho samente le ho eketsa chai ea seretse.
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 methyl cellulose hangata li na le pseudoplastic le non-thixotropic fluidity ka tlase ho mocheso oa gel, empa li bonts'a thepa ea phallo ea Newtonian ka litheko tse tlase tsa ho kuta. Pseudoplasticity e eketseha ka boima ba molek'hule kapa bongata ba cellulose ether, ho sa tsotelehe mofuta oa ntho e nkeloang sebaka le tekanyo ea ho e nkela sebaka. Ka hona, li-cellulose ethers tsa sehlopha se tšoanang sa viscosity, ebang ke HPMC kapa 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 betere, empa ho phahama ha viscosity, ho phahamisa boima ba molek'hule ea cellulose ether, le ho fokotseha ho tšoanang ha solubility ea eona, e nang le phello e mpe. mabapi le mahloriso a seretse le ts'ebetso ea kaho.
3. Cellulose ether - Matla a ho kenya moea
Cellulose ether e na le phello e hlakileng ea ho kenya moea linthong tse ncha tse thehiloeng ho samente. Cellulose ether e na le lihlopha tse peli tsa hydrophilic (lihlopha tsa hydroxyl, lihlopha tsa ether) le lihlopha tsa hydrophobic (lihlopha tsa methyl, li-glucose rings), 'me ke sesebelisoa se nang le ts'ebetso ea holim'a metsi, kahoo se na le phello ea moea. Phello e kenang moeeng ea cellulose ether e tla hlahisa "bolo", e ka ntlafatsang ts'ebetso ea lisebelisoa tse sa tsoa tsoakana, tse kang ho eketsa polasetiki le boreleli ba seretse nakong ea ts'ebetso, e leng se loketseng ho hasana ha seretse. ; e tla boela e eketse tlhahiso ea seretse, ho fokotsa litšenyehelo tsa tlhahiso ea seretse; empa e tla eketsa porosity ea thepa e thata le ho fokotsa thepa ea eona ea mechine e kang matla le elastic modulus.
E le surfactant, cellulose ether e boetse e na le phello ea ho kolobisa kapa ea ho tlotsa likaroloana tsa samente, e leng ho eketsang metsi a thepa e thehiloeng ho samente hammoho le phello ea eona ea ho kenya moea, empa phello ea eona e teteaneng e tla fokotsa metsi. Phello ea fluidity ke motsoako oa polasetiki le liphello tse teteaneng. Ka kakaretso, ha litaba tsa cellulose ether li le tlase haholo, ts'ebetso e kholo ke polasetiki kapa ho fokotsa metsi; ha litaba li phahame, phello e matla ea cellulose ether e eketseha ka potlako, 'me phello ea eona ea ho kenya moea e atisa ho tlala. Kahoo e bontša e le phello e teteaneng kapa keketseho ea tlhokahalo ea metsi.
4. Cellulose Ether - Ho lieha
Cellulose ether e tla lelefatsa nako ea ho beha samente peista kapa seretse, le ho lieha hydration kinetics ea samente, e leng molemo ho ntlafatsa operability nako ea thepa e sa tsoa tsoakoa, ho ntlafatsa ho tsitsana ha seretse le tahlehelo ea konkreite slump ka nako, empa e ka 'na ea. hape baka tieho tsoelopeleng ea kaho.
Nako ea poso: Jun-02-2023