Ka seretse se seng se lokiselitsoe, ether e nyenyane ea cellulose e ka ntlafatsa haholo ts'ebetso ea seretse se metsi. Ho ka bonoa hore cellulose ether ke tlatsetso e kholo e amang ts'ebetso ea kaho ea seretse. Ho khetha li-cellulose ethers tsa mefuta e fapaneng, li-viscosity tse fapaneng, boholo bo fapaneng ba likaroloana, likhato tse fapaneng tsa viscosity le lipalo tse ekelitsoeng le tsona li na le litlamorao tse fapaneng ho ntlafatseng ts'ebetso ea seretse se omileng. Hajoale, liretse tse ngata tsa masonry le plastering li na le thepa e mpe ea ho boloka metsi. Seretse sa metsi se tla arohana ka mor'a hore se se tlohele metsotso e seng mekae. Ka hona, ho bohlokoa haholo ho eketsa cellulose ether ho seretse sa samente. Ha re hlahlobeng ka botlalo mesebetsi ea cellulose ether ka seretseng sa samente!
1.Cellulose ether-water retention
Ho boloka metsi ke thepa ea bohlokoa ea cellulose ether, hape ke thepa eo bahlahisi ba bangata ba seretse se omeletseng, haholo-holo ba sebakeng se ka boroa se nang le mocheso o phahameng, ba e ela hloko. Ha ho etsoa thepa ea mohaho, haholo-holo seretse se omileng, selulose 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 tekanyo e phahame, ho boloka metsi ho molemo. Hangata, palo e nyane ea cellulose ether e ka ntlafatsa haholo sekhahla sa ho boloka metsi a seretse. Ha tekanyo e fihla boemong bo itseng, mokhoa oa ho eketsa lebelo la ho boloka metsi o fokotseha; ho boloka metsi a cellulose ether hangata ho fokotseha ha mocheso o ntse o eketseha, empa li-ether tse ling tse fetotsoeng tsa cellulose li boetse li na le ho boloka metsi hantle tlas'a maemo a phahameng a mocheso; cellulose ethers tse nang le degree e tlase ea substitution li na le ts'ebetso e ntle ea ho boloka metsi.
Lihlopha tsa hydroxyl ka limolek'hule tsa ether tsa cellulose le liathomo tsa oksijene holim'a litlamo tsa ether li tla theha likamano tsa hydrogen le limolek'hule tsa metsi, li fetole metsi a sa lefelloeng hore e be metsi a tlamiloeng, kahoo a bapala karolo e ntle ea ho boloka metsi; Phapang pakeng tsa limolek'hule tsa metsi le liketane tsa limolek'hule tsa cellulose ether li lumella limolek'hule tsa metsi hore li kene ka hare ho ketane ea cellulose ether macromolecular 'me li be tlas'a lithibelo tse matla, kahoo li etsa metsi a sa lefelloeng le metsi a ts'oaretsoeng, ka tsela eo, ho ntlafatsa ho boloka metsi a slurry ea samente; cellulose ether e ntlafatsa thepa ea rheological, sebopeho sa marang-rang sa porous le khatello ea osmotic ea slurry e ncha ea samente, kapa thepa ea ho etsa filimi ea cellulose ether e sitisa ho hasana ha metsi.
2.Cellulose ether-thickening le thixotropy
Cellulose ether e fana ka seretse se metsi viscosity e ntle haholo, e ka eketsang haholo bokhoni ba maqhama 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 lithaele le litsamaiso tsa ka ntle tsa marako. Tšusumetso e ntseng e eketseha ea cellulose ether e ka boela ea eketsa ho hanyetsa ho hasana le homogeneity ea thepa e ncha, ho thibela ho senyeha ha lintho tse bonahalang, karohano le ho tsoa mali, 'me e ka sebelisoa ka konkreite ea fiber, konkreite e ka tlas'a metsi le konkreite e ikemetseng.
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 ntlafatsa viscosity ea lisebelisoa tse fetotsoeng tsa samente. Leha ho le joalo, haeba viscosity e phahame haholo, e tla ama metsi le ho sebetsa ha thepa (e kang ho khomarela thipa ea samente). Liretse tse ikemetseng le konkreite e ikamahanyang e hlokang metsi a mangata e hloka hore ho be le viscosity e tlase ea cellulose ether. Ho feta moo, phello e matla ea cellulose ethers e 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 methylcellulose ka kakaretso li na le thepa ea phallo ea pseudoplastic, e seng thixotropic ka tlase ho mocheso oa bona oa gel, empa e bonts'a thepa ea phallo ea Newtonian ka litefiso tse tlase tsa ho kuta. Pseudoplasticity e eketseha ka ho eketseha ha boima ba limolek'hule kapa khatello ea cellulose ether, ho sa tsotellehe mofuta le tekanyo ea ho nkela sebaka. Ka hona, li-cellulose ethers tsa sehlopha se tšoanang sa viscosity, ebang ke MC, HPMC, kapa HEMC, li tla lula li bontša litšobotsi tse tšoanang tsa rheological hafeela mahloriso le mocheso li bolokiloe kamehla. Ha mocheso o ntse o eketseha, gel ea sebopeho e thehoa 'me phallo e phahameng ea thixotropic e etsahala.
Libaka tse phahameng le li-viscosity tse tlaase tsa cellulose ethers li bontša thixotropy esita le ka tlase ho mocheso oa gel. Thepa ena e na le molemo o moholo ho lokiseng boleng ba seretse sa moaho nakong ea kaho. Hoa lokela ho hlokomeloa mona hore ho phahama ha viscosity ea cellulose ether, ho boloka metsi ho molemo, empa ho phahama ha viscosity, ho phahamisa boima ba molek'hule ea cellulose ether, 'me ho qhibiliha ha eona ho fokotseha ka tsela e nepahetseng, e nang le tšusumetso e mpe ho mahloriso a seretse le ts'ebetso ea kaho.
3.Cellulose ether-air entraining effect
Cellulose ether e na le phello e kholo 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, mehele ea glucose). Ke surfactant e nang le ts'ebetso ea holim'a metsi 'me kahoo e na le phello e kenang moeeng. Phello ea ho kenya moea ea cellulose ether e tla hlahisa phello ea "bolo", e ka ntlafatsang ts'ebetso ea lisebelisoa tse sa tsoa tsoakoa, tse kang ho eketsa polasetiki le boreleli ba seretse nakong ea ts'ebetso, e leng molemo oa ho betla seretse; hape e tla eketsa tlhahiso ea seretse le ho fokotsa litšenyehelo tsa tlhahiso ea seretse; empa e tla eketsa porosity ea thepa e thata le ho fokotsa thepa ea bona ea mechine e kang matla le modulus elastic.
Joaloka surfactant, cellulose ether e boetse e na le phello ea ho kolobisa kapa ho tlotsa likaroloana tsa samente, tseo hammoho le phello ea eona ea ho kenya moea e eketsang metsi a thepa e thehiloeng ho samente, empa phello ea eona e teteaneng e tla fokotsa metsi. Phello ea cellulose ether ho fluidity ea thepa e thehiloeng samente ke motsoako oa polasetiki le liphello tse teteaneng. Ha re bua ka kakaretso, ha tekanyo ea cellulose ether e le tlase haholo, e bontša haholo-holo e le polasetiki kapa phello ea ho fokotsa metsi; ha litekanyetso li le holimo, phello e teteaneng ea cellulose ether e eketseha ka potlako, 'me phello ea eona ea ho kenya moea e atisa ho tlala, kahoo e bonahala e le phello e teteaneng kapa tlhokahalo e eketsehileng ea metsi.
4.Cellulose ether-retarding effect
Cellulose ether e tla lelefatsa nako ea ho beha samente peista kapa seretse le ho liehisa samente hydration dynamics, e leng molemo ho eketsa operability nako ea thepa e ncha motsoako le ho ntlafatsa tahlehelo e itšetlehileng ka nako ea seretse ho tsitsa le ho putlama ha konkreite, empa ho ka boela ha e-ba molemo. liehisa tsoelopele ea kaho.
Nako ea poso: Sep-24-2024