Phello ea mocheso o tikolohong ea ho sebetsa ha cellulose ether e fetotsoeng gypsum

Ts'ebetso ea cellulose ether e fetotsoeng gypsum ka mocheso o fapaneng oa tikoloho e fapane haholo, empa mokhoa oa eona ha o hlake.Liphello tsa cellulose ether ho li-parameter tsa rheological le ho boloka metsi a gypsum slurry ka mocheso o fapaneng oa mocheso o ile oa ithutoa.Bophara ba hydrodynamic ba cellulose ether mokhahlelong oa mokelikeli bo ile ba lekanngoa ka mokhoa o matla oa ho hasanya leseli, 'me mochine oa tšusumetso o ile oa hlahlojoa.Liphetho li bonts'a hore cellulose ether e na le phello e ntle ea ho boloka metsi le ho tenya ho gypsum.Ka keketseho ea cellulose ether content, viscosity ea slurry ea eketseha 'me matla a ho boloka metsi a eketseha.Leha ho le joalo, ka ho eketseha ha mocheso, matla a ho boloka metsi a gypsum slurry e fetotsoeng a fokotseha ho isa bohōleng bo itseng, 'me litekanyetso tsa rheological le tsona lia fetoha.Ha ho nahanoa hore mokhatlo oa cellulose ether colloid o ka finyella ho boloka metsi ka ho thibela mocha oa lipalangoang tsa metsi, ho phahama ha mocheso ho ka lebisa ho senyeha ha mokhatlo o moholo oa molumo o hlahisoang ke cellulose ether, kahoo ho fokotsa ho boloka metsi le ho sebetsa ha gypsum e fetotsoeng.

Mantsoe a bohlokoa:gypsum;Cellulose ether;Mocheso;Ho boloka metsi;rheology

0. Selelekela

Gypsum, joalo ka mofuta oa thepa e nang le tikoloho e nang le meaho e metle le thepa ea 'mele, e sebelisoa haholo mererong ea mokhabiso.Ha ho sebelisoa lisebelisoa tse thehiloeng ho gypsum, moemeli oa ho boloka metsi o atisa ho eketsoa ho fetola slurry ho thibela tahlehelo ea metsi nakong ea hydration le ho thatafala.Cellulose ether ke ntho e sebelisoang haholo ho boloka metsi hajoale.Hobane ionic CE e tla sebetsana le Ca2+, hangata e sebelisa non-ionic CE, joalo ka: hydroxypropyl methyl cellulose ether, hydroxyethyl methyl cellulose ether le methyl cellulose ether.Ho bohlokoa ho ithuta thepa ea cellulose ether e fetotsoeng gypsum bakeng sa ts'ebeliso e ntle ea gypsum ho boenjiniere ba mekhabiso.

Cellulose ether ke motsoako o phahameng oa limolek'hule o hlahisoang ke karabelo ea alkali cellulose le etherifying agent tlas'a maemo a itseng.Nonionic cellulose ether e sebelisoang ho boenjiniere ba kaho e na le phallo e ntle, ho boloka metsi, ho kopanya le ho teteaneng.Ho eketsoa ha cellulose ether ho na le phello e hlakileng haholo ho bolokoeng ha metsi a gypsum, empa matla a ho kobeha le a hatellang a 'mele o thata oa gypsum le ona a fokotseha hanyane ka keketseho ea palo ea tlatsetso.Sena ke hobane cellulose ether e na le phello e itseng ea ho kenya moea, e tla hlahisa li-bubble nakong ea ho kopanya slurry, kahoo ho fokotsa thepa ea mochine ea 'mele o thata.Ka nako e ts'oanang, ether ea cellulose e ngata haholo e tla etsa hore motsoako oa gypsum o khomarele, o fella ka ts'ebetso ea eona ea kaho.

Ts'ebetso ea hydration ea gypsum e ka aroloa ka mehato e mene: ho qhibiliha ha calcium sulfate hemihydrate, crystallization nucleation ea calcium sulfate dihydrate, kholo ea nucleus ea crystalline le ho thehoa ha sebopeho sa crystalline.Ts'ebetsong ea hydration ea gypsum, sehlopha se sebetsang sa hydrophilic sa cellulose ether se adsorbing holim'a likaroloana tsa gypsum se tla lokisa karolo ea limolek'hule tsa metsi, kahoo li liehe ts'ebetso ea nucleation ea gypsum hydration le ho eketsa nako ea ho beha gypsum.Ka tlhahlobo ea SEM, Mroz o fumane hore le hoja boteng ba cellulose ether bo liehile ho hōla ha likristale, empa bo ekelitse ho kopana le ho bokellana ha likristale.

Cellulose ether e na le lihlopha tsa hydrophilic e le hore e be le hydrophilicity e itseng, ketane e telele ea polymer e kopanang e le hore e be le viscosity e phahameng, ho sebelisana ha bobeli ho etsa hore selulose e be le phello e ntle ea ho boloka metsi ka har'a motsoako oa gypsum.Bulichen o hlalositse mokhoa oa ho boloka metsi oa cellulose ether ka samente.Ha u kopanya ka tlaase, cellulose ether adsorb holim'a samente bakeng sa ho monya metsi ka intramolecular le ho tsamaea le ho ruruha ho finyella ho boloka metsi.Ka nako ena, ho boloka metsi ho fokola.Tekanyetso e phahameng, cellulose ether e tla theha li-nanometers tse makholo ho li-micron tse seng kae tsa colloidal polymer, ka katleho e thibela tsamaiso ea gel ka sekoting, ho finyella ho boloka metsi hantle.Mokhoa oa ts'ebetso oa cellulose ether ka gypsum o ts'oana le oa samente, empa khatello e phahameng ea SO42 mokhahlelong oa mokelikeli oa gypsum slurry e tla fokolisa phello ea ho boloka metsi ea selulose.

Ho itšetlehile ka litaba tse ka holimo, ho ka fumanoa hore lipatlisiso tsa morao-rao mabapi le cellulose ether modified gypsum haholo-holo e tsepamisitse maikutlo ho hydration process ea cellulose ether ka gypsum mix, thepa ea ho boloka metsi, thepa ea mechine le microstructure ea 'mele o thata, le mochine oa cellulose ether. ho boloka metsi.Leha ho le joalo, thuto mabapi le tšebelisano pakeng tsa cellulose ether le gypsum slurry ka mocheso o phahameng e ntse e sa lekana.Cellulose ether aqueous solution e tla gelatinize ka mocheso o itseng.Ha mocheso o ntse o eketseha, viscosity ea cellulose ether aqueous solution e tla fokotseha butle-butle.Ha mocheso oa gelatinization o fihletsoe, cellulose ether e tla kenngoa ka gel e tšoeu.Ka mohlala, mohahong oa lehlabula, mocheso o pota-potileng o phahame, thepa ea gel ea mocheso ea cellulose ether e tlamehile ho lebisa liphetohong tsa ho sebetsa ha gypsum slurry e fetotsoeng.Mosebetsi ona o hlahloba phello ea ho phahama ha mocheso holim'a ho sebetsa ha selulose ether e fetotsoeng gypsum thepa ka liteko tse hlophisitsoeng, 'me e fana ka tataiso bakeng sa tšebeliso e sebetsang ea cellulose ether e fetotsoeng gypsum.

1. Teko

1.1 Lisebelisoa tse tala

Gypsum ke mofuta oa β-gypsum oa moaho oa tlhaho o fanoeng ke Beijing Ecological Home Group.

Cellulose ether e khethiloeng ho tsoa ho Shandong Yiteng Group hydroxypropyl methyl cellulose ether, litlhaloso tsa sehlahisoa bakeng sa 75,000 mPa·s, 100,000 mPa·s le 200000mPa · s, mocheso oa gelation o ka holimo ho 60 ℃.Citric acid e khethiloe e le gypsum retarder.

1.2 Teko ea Rheology

Sesebelisoa sa tlhahlobo ea rheological se sebelisitsoeng ke RST⁃CC rheometer e hlahisoang ke BROOKFIELD USA.Li-parameter tsa ramatiki tse kang viscosity ea polasetiki le lihlahisoa tsa shear stress tsa gypsum slurry li khethiloe ke MBT⁃40F⁃0046 sampole setshelo le CC3⁃40 rotor, 'me data e ile ea sebetsoa ke RHE3000 software.

Litšobotsi tsa motsoako oa gypsum li lumellana le boitšoaro ba rheological ba Bingham fluid, eo hangata e ithutoang ho sebelisoa mohlala oa Bingham.Leha ho le joalo, ka lebaka la pseudoplasticity ea cellulose ether e kentsoeng ho gypsum e fetotsoeng ea polymer, motsoako oa slurry hangata o hlahisa thepa e itseng ea ho kuta.Tabeng ena, mohlala o fetotsoeng oa Bingham (M⁃B) o ka hlalosa hantle lekhalo la rheological la gypsum.Bakeng sa ho ithuta ka deformation ea shear ea gypsum, mosebetsi ona o boetse o sebelisa mohlala oa Herschel⁃Bulkley (H⁃B).

1.3 Teko ea ho boloka metsi

Mokhoa oa teko o bua ka GB/T28627⁃2012 Plastering Plaster.Nakong ea teko ea mocheso e le ho fetoha, gypsum e ne e chesoa pele ho 1h pele ho mocheso o lumellanang le ontong, 'me metsi a tsoakiloeng a sebelisitsoeng tekong a ne a futhumetse 1h ka mocheso o lumellanang le mocheso o sa khaotseng oa ho hlapa metsi,' me sesebelisoa se sebelisitsoeng. e chesitsoe pele.

1.4 Teko ea bophara ba Hydrodynamic

Bophahamo ba hydrodynamic (D50) ea HPMC polymer association boemong ba mokelikeli bo ile ba lekanyetsoa ho sebelisoa mochine o matla oa ho hasanya likaroloana (Malvern Zetasizer NanoZS90).

2. Liphetho le lipuisano

2.1 Thepa ea ramatiki ea HPMC e fetotsoeng gypsum

Viscosity e bonahalang ke karo-karolelano ea khatello ea ho kuta ho sekhahla sa ho kuta e sebetsang holim'a mokelikeli 'me ke parameter e bontšang ho phalla ha maro a seng a Newton.The viscosity e bonahalang ea gypsum slurry e fetotsoeng e ile ea fetoha le litaba tsa cellulose ether tlas'a litlhaloso tse tharo tse fapaneng (75000mPa·s, 100,000mpa ·s le 200000mPa·s).Thempereichara ea teko e ne e le 20 ℃.Ha sekhahla sa ho kuta sa rheometer e le 14min-1, ho ka fumanoa hore viscosity ea gypsum slurry e eketseha ka keketseho ea ho kenngoa ha HPMC, 'me ha viscosity ea HPMC e phahame, ho tla ba le viscosity e fetotsoeng ea gypsum slurry.Sena se bontša hore HPMC e na le phello e hlakileng ea ho tiea le ea viscosification ho gypsum slurry.Gypsum slurry le cellulose ether ke lintho tse nang le viscosity e itseng.Motsoakong o fetotsoeng oa gypsum, cellulose ether e adsorbed holim'a lihlahisoa tsa gypsum hydration, 'me marang-rang a entsoeng ka cellulose ether le marang-rang a entsoeng ke motsoako oa gypsum a kopantsoe, ho fella ka "superposition effect", e leng ho ntlafatsa haholo viscosity ka kakaretso. thepa e fetotsoeng ea gypsum.

The shear ⁃ stress curves of pure gypsum (G⁃H) and modified gypsum (G⁃H) paste e nang le 75000mPa·s-HPMC, joalo ka ha ho nahanoa ho tsoa ho mofuta o ntlafalitsoeng oa Bingham (M⁃B).Ho ka fumanoa hore ka keketseho ea sekhahla sa ho kuta, khatello ea ho kuta ea motsoako e boetse e eketseha.Plastiki viscosity (ηp) le chaield shear stress (τ0) boleng ba gypsum e hloekileng le HPMC e fetotsoeng gypsum ka mocheso o fapaneng lia fumanoa.

Ho tloha ho viscosity ea polasetiki (ηp) le chaield shear stress (τ0) boleng ba gypsum e hloekileng le HPMC e fetotsoeng gypsum ka mocheso o fapaneng, ho ka bonoa hore khatello ea lihlahisoa tsa HPMC e fetotsoe gypsum e tla fokotseha ka ho tsoelang pele ka ho eketseha ha mocheso, le lihlahisoa. khatello ea maikutlo e tla fokotseha ka 33% ho 60 ℃ ha e bapisoa le 20 ℃.Ka ho shebella mokokotlo oa viscosity ea polasetiki, ho ka fumanoa hore viscosity ea polasetiki ea gypsum slurry e fetotsoeng le eona e fokotseha ka ho eketseha ha mocheso.Leha ho le joalo, lihlahisoa khatello ea kelello le viscosity polasetiki ea gypsum slurry e hloekileng e eketseha hanyenyane ka ho eketseha ha mocheso, e leng se bontšang hore phetoho ea litekanyetso tsa rheological tsa HPMC e fetotsoeng gypsum slurry nakong ea ho eketseha ha mocheso e bakoa ke phetoho ea thepa ea HPMC.

Boleng ba khatello ea lihlahisoa tsa gypsum slurry bo bonts'a boleng bo phahameng ba khatello ea ho kuta ha slurry e hanela deformation ea ho kuta.Ha boleng ba khatello ea lihlahisoa bo boholo, bo ka tsitsa haholoanyane gypsum slurry.Viscosity ea polasetiki e bonts'a sekhahla sa deformation ea gypsum slurry.Ha li-viscosity tsa polasetiki li le kholoanyane, nako e telele ea deformation ea shear ea slurry e tla ba teng.Qetellong, mekhahlelo e 'meli ea rheological ea HPMC e fetotsoeng gypsum slurry e fokotseha ho hlakile ka ho eketseha ha mocheso,' me phello e matla ea HPMC ho gypsum slurry ea fokola.

The deformation ea ho kuta ha slurry e bolela ho teteana ha ho kuta kapa ho beola ha ho kuta ho bonahatsoang ke slurry ha ho sebelisoa matla a ho kuta.The shear deformation effect ea slurry e ka ahloloa ka index ea pseudoplastic n e fumanoang ho tloha mokhoeng o loketseng.Ha n <1, gypsum slurry e bonts'a ho kuta, 'me tekanyo ea ho kuta ea gypsum slurry e ba e phahameng ka ho fokotseha ha n.Ha n > 1, gypsum slurry e bonts'a ho teteana ha ho kuta, 'me tekanyo ea ho kuta ea gypsum slurry e ile ea eketseha ka keketseho ea n.Rheological curves of HPMC modified gypsum slurry ka dithempereichara tse fapaneng tse ipapisitseng le Herschel⁃Bulkley (H⁃B) model fitting, kahoo fumana pseudoplastic index n of HPMC modified gypsum slurry.

Ho ea ka index ea pseudoplastic n ea HPMC e fetotsoeng gypsum slurry, deformation ea shear ea gypsum slurry e kopantsoeng le HPMC ke ho kuta, 'me boleng ba n butle-butle bo eketseha ka ho eketseha ha mocheso, e leng se bontšang hore boitšoaro bo fokolang ba HPMC bo tla fokotseha. ho fokola ho isa boholeng bo itseng ha o angoa ke mocheso.

Ho ipapisitsoe le liphetoho tse hlakileng tsa viscosity ea gypsum slurry e fetotsoeng e nang le sekhahla sa ho kuta se baloang ho data ea khatello ea ho kuta ea 75000 mPa· HPMC ka mocheso o fapaneng, ho ka fumanoa hore viscosity ea polasetiki ea gypsum slurry e fetotsoeng e fokotseha ka potlako ka keketseho ea sekhahla sa ho kuta, e netefatsang sephetho se loketseng sa mofuta oa H⁃B.The gypsum slurry e fetotsoeng e bonts'itse litšobotsi tsa ho kuta.Ka ho eketseha ha mocheso, viscosity e bonahalang ea motsoako e fokotseha ho isa tekanyong e itseng ka tekanyo e tlaase ea ho kuta, e leng se bontšang hore phello e fokolang ea ho kuta ea gypsum slurry e fetotsoeng e fokotsehile.

Ts'ebelisong ea 'nete ea gypsum putty, gypsum slurry e hlokahala hore e be bonolo ho holofala ts'ebetsong ea ho rubbing le ho lula e tsitsitse ha u phomotse, e hlokang hore gypsum slurry e be le litšobotsi tse ntle tsa ho kuta, le phetoho ea ho kuta ea HPMC e fetotsoeng gypsum ha e fumanehe hangata. tekanyo e itseng, e sa lumellaneng le kaho ea lisebelisoa tsa gypsum.The viscosity ea HPMC ke e 'ngoe ea li-parameter tsa bohlokoa, hape ke lebaka le ka sehloohong la hore e phetha karolo ea ho tiisa ho ntlafatsa litšobotsi tse fapaneng tsa ho phalla ha motsoako.Cellulose ether ka boeona e na le thepa ea gel e chesang, viscosity ea tharollo ea eona ea metsi e fokotseha butle-butle ha mocheso o ntse o eketseha, 'me gel e tšoeu e phalla ha e fihla mocheso oa gelation.Phetoho ea rheological parameters ea cellulose ether fetotsoeng gypsum le mocheso e haufi-ufi amanang le phetoho ea viscosity, hobane phello e thickening ke phello ea superposition ea selulose ether le slurry e tsoakiloeng.Boenjiniere bo sebetsang, phello ea mocheso oa tikoloho ts'ebetsong ea HPMC e lokela ho nkoa.Mohlala, mocheso oa lisebelisoa tse tala o lokela ho laoloa ka mocheso o phahameng lehlabula ho qoba ts'ebetso e mpe ea gypsum e fetotsoeng e bakoang ke mocheso o phahameng.

2.2 Poloko ea metsi eaHPMC e fetotsoeng gypsum

Ho bolokoa ha metsi a gypsum slurry e fetotsoeng ka litlhaloso tse tharo tse fapaneng tsa cellulose ether e fetoloa ka sekhahla sa litekanyetso.Ka keketseho ea litekanyetso tsa HPMC, sekhahla sa ho boloka metsi sa gypsum slurry se ntlafatsoa haholo, 'me mokhoa oa ho eketseha o tsitsitse ha tekanyo ea HPMC e fihla ho 0.3%.Qetellong, sekhahla sa ho boloka metsi sa gypsum slurry se tsitsitse ho 90% ~ 95%.Sena se bontša hore HPMC e na le phello e hlakileng ea ho boloka metsi holim'a peista ea majoe, empa phello ea ho boloka metsi ha e ntlafatsoe haholo ha litekanyetso li ntse li eketseha.Litlhaloso tse tharo tsa phapang ea tekanyo ea ho boloka metsi ea HPMC ha e kholo, ka mohlala, ha litaba li le 0.3%, palo ea tekanyo ea ho boloka metsi ke 5%, ho kheloha ho tloaelehileng ke 2.2.HPMC e nang le viscosity e phahameng ka ho fetisisa ha se tekanyo e phahameng ka ho fetisisa ea ho boloka metsi, 'me HPMC e nang le viscosity e tlaase ka ho fetisisa hase tekanyo e tlaase ka ho fetisisa ea ho boloka metsi.Leha ho le joalo, ha ho bapisoa le gypsum e hloekileng, sekhahla sa ho boloka metsi sa HPMC e meraro bakeng sa gypsum slurry se ntlafalitsoe haholo, 'me sekhahla sa ho boloka metsi sa gypsum e fetotsoeng ka har'a 0.3% se eketsehile ka 95%, 106%, 97% ha e bapisoa le sehlopha sa taolo se se nang letho.Ho hlakile hore cellulose ether e ka ntlafatsa ho boloka metsi a gypsum slurry.Ka keketseho ea litaba tsa HPMC, sekhahla sa ho boloka metsi sa HPMC se fetotsoeng sa gypsum slurry se nang le viscosity e fapaneng butle-butle se fihla sebakeng sa saturation.10000mPa·sHPMC e fihlile boemong ba ho tlala ho 0.3%, 75000mPa·s le 20000mPa·s HPMC e fihlile sebakeng sa 0.2%.Liphetho li bonts'a hore ho boloka metsi a 75000mPa·s HPMC e fetotsoe gypsum e fetoha le mocheso tlas'a litekanyetso tse fapaneng.Ka ho fokotseha ha mocheso, sekhahla sa ho boloka metsi sa HPMC e fetotsoeng gypsum se fokotseha butle-butle, ha sekhahla sa ho boloka metsi sa gypsum e hloekileng se lula se sa fetohe, se bontšang hore ho eketseha ha mocheso ho fokolisa phello ea ho boloka metsi ea HPMC ho gypsum.Sekhahla sa ho boloka metsi sa HPMC se theohile ka 31.5% ha mocheso o nyoloha ho tloha ho 20 ℃ ho ea ho 40 ℃.Ha mocheso o nyoloha ho tloha ho 40 ℃ ho ea ho 60 ℃, sekhahla sa ho boloka metsi sa gypsum e fetotsoeng ea HPMC se tšoana hantle le sa gypsum e hloekileng, e leng se bontšang hore HPMC e lahlehetsoe ke phello ea ho ntlafatsa ho boloka metsi a gypsum ka nako ena.Jian Jian le Wang Peiming ba ile ba etsa tlhahiso ea hore selulose ether ka boeona e na le ts'ebetso ea gel ea mocheso, phetoho ea mocheso e tla lebisa liphetohong tsa viscosity, morphology le adsorption ea cellulose ether, e tlang ho lebisa liphetohong tsa ts'ebetso ea motsoako oa slurry.Bulichen o boetse a fumana hore viscosity e matla ea tharollo ea samente e nang le HPMC e fokotsehile ka mocheso o ntseng o eketseha.

Phetoho ea ho boloka metsi ea motsoako o bakoang ke ho eketseha ha mocheso o lokela ho kopanngoa le mochine oa cellulose ether.Bulichen o hlalositse mochine oo cellulose ether e ka bolokang metsi ka samente.Lits'ebetsong tse thehiloeng ho samente, HPMC e ntlafatsa sekhahla sa ho boloka metsi a slurry ka ho fokotsa ho kenella ha "kuku ea sefa" e entsoeng ke sistimi ea samente.Motsoako o itseng oa HPMC mokhahlelong oa mokelikeli o tla theha li-nanometer tse makholo a 'maloa ho li-micron tse' maloa tsa mokhatlo oa colloidal, sena se na le palo e itseng ea sebopeho sa polymer se ka koalang mocha oa phetisetso ea metsi ka har'a motsoako, ho fokotsa ho kenella ha "kuku ea sefa", ho boloka metsi hantle.Bulichen o boetse a bonts'a hore HPMCS ka gypsum e bonts'a mochini o ts'oanang.Ka hona, thuto ea bophara ba hydromechanical ea mokhatlo o entsoeng ke HPMC karolong ea metsi e ka hlalosa phello ea HPMC ho boloka metsi a gypsum.

2.3 Hydrodynamic bophara ba HPMC colloid association

Li-curve tsa kabo ea likarolo tse fapaneng tsa 75000mPa·s HPMC mokhahlelong oa mokelikeli, le li-curve tsa kabo ea likaroloana tsa lintlha tse tharo tsa HPMC sebakeng sa mokelikeli sebakeng sa 0.6%.E ka bonoa ho tloha karohano ea phallo ea likaroloana tsa HPMC ea litlhaloso tse tharo karolong ea mokelikeli ha mahloriso a le 0.6% hore, ka keketseho ea mahloriso a HPMC, boholo ba likaroloana tsa metsoako e amanang le motsoako o entsoeng karolong ea mokelikeli le oona oa eketseha.Ha mahloriso a le tlase, likaroloana tse entsoeng ke HPMC aggregation li nyane, 'me ke karolo e nyane feela ea HPMC e kopanang ka likaroloana tse ka bang 100nm.Ha mahloriso a HPMC e le 1%, ho na le palo e kholo ea mekhatlo ea colloidal e nang le bophara ba hydrodynamic e ka bang 300nm, e leng letšoao la bohlokoa la ho kopana ha molek'hule.Sebopeho sena sa "molumo o moholo" oa polymerization se ka thibela ka katleho mocha oa phetisetso ea metsi ka har'a motsoako, oa fokotsa "permeability ea kuku", 'me ho boloka metsi a ts'oanang a motsoako oa gypsum nakong ea mahloriso ena ho boetse ho feta 90%.Li-diameter tsa hydromechanical tsa HPMC tse nang le li-viscosity tse fapaneng sebakeng sa mokelikeli li tšoana hantle, tse hlalosang sekhahla se ts'oanang sa ho boloka metsi sa HPMC e fetotsoeng gypsum slurry e nang le li-viscosity tse fapaneng.

Li-curve tsa kabo ea boholo ba likarolo tsa 75000mPa·s HPMC e nang le 1% ea lithempereichara tse fapaneng.Ka ho eketseha ha mocheso, ho bola ha HPMC colloidal association ho ka fumanoa ka ho hlaka.Ho 40 ℃, palo e kholo ea 300nm association e ile ea nyamela ka ho feletseng 'me ea senyeha ka likaroloana tse nyenyane tsa 15nm.Ha mocheso o ntse o eketseha, HPMC e fetoha likaroloana tse nyenyane, 'me ho boloka metsi a gypsum slurry ho lahleheloa ka ho feletseng.

Ketsahalo ea thepa ea HPMC e fetohang ka ho phahama ha mocheso e boetse e tsejoa e le thepa ea gel e chesang, pono e tloaelehileng e teng ke hore ka mocheso o tlase, li-macromolecules tsa HPMC li qala ho qhalakanngoa ka metsing ho qhibiliha tharollo, limolek'hule tsa HPMC tse phahameng haholo li tla theha mokhatlo o moholo oa likaroloana. .Ha mocheso o phahama, metsi a HPMC a fokotsehile, metsi a pakeng tsa liketane a lokolloa butle-butle, lik'hemik'hale tse kholo tsa mekhatlo li qhalakanngoa butle-butle ka likaroloana tse nyenyane, viscosity ea tharollo e fokotseha, 'me sebopeho sa marang-rang a mararo se thehoa ha gelation. mocheso o fihlelleha, 'me gel e tšoeu e na le pula.

Bodvik o fumane hore thepa ea microstructure le adsorption ea HPMC karolong ea metsi e fetotsoe.Ha e kopantsoe le khopolo ea Bulichen ea HPMC colloidal association e thibelang kanale ea lipalangoang tsa metsi a slurry, ho ile ha fihleloa qeto ea hore ho eketseha ha mocheso ho lebisitse ho qhalaneng ha HPMC colloidal association, e leng se ileng sa fella ka ho fokotseha ha metsi a gypsum e fetotsoeng.

3. Qetello

(1) Cellulose ether ka boeona e na le viscosity e phahameng le "superimposed" phello e nang le gypsum slurry, e bapalang phello e hlakileng ea ho teteana.Ka mocheso oa kamore, phello e teteaneng e bonahala haholoanyane ka ho eketseha ha viscosity le litekanyetso tsa cellulose ether.Leha ho le joalo, ka ho eketseha ha mocheso, viscosity ea cellulose ether ea fokotseha, phello ea eona e teteaneng e fokotseha, khatello ea lihlahisoa tsa lihlahisoa le viscosity ea polasetiki ea motsoako oa gypsum e fokotseha, pseudoplasticity ea fokola, 'me thepa ea kaho e mpefala.

(2) Cellulose ether e ntlafalitse ho boloka metsi a gypsum, empa ka ho eketseha ha mocheso, ho boloka metsi a gypsum e fetotsoeng le hona ho fokotsehile haholo, esita le ho 60 ℃ ho tla lahleheloa ke phello ea ho boloka metsi ka ho feletseng.Sekhahla sa ho boloka metsi sa gypsum slurry se ile sa ntlafatsoa haholo ke cellulose ether, mme sekhahla sa ho boloka metsi sa HPMC se fetotsoeng sa gypsum slurry se nang le viscosity e fapaneng butle-butle se ile sa fihla sebakeng sa saturation ka keketseho ea litekanyetso.Ho boloka metsi a Gypsum ka kakaretso ho lekana le viscosity ea cellulose ether, ka viscosity e phahameng ha e na phello e nyane.

(3) Lintlha tse ka hare tse fetolang ho bolokoa ha metsi a cellulose ether ka mocheso li amana haufi-ufi le microscopic morphology ea cellulose ether mohatong oa mokelikeli.Sebakeng se itseng, cellulose ether e atisa ho bokellana ho theha mekhatlo e meholo ea colloidal, e thibelang mocha oa lipalangoang oa metsi oa motsoako oa gypsum ho finyella ho boloka metsi a mangata.Leha ho le joalo, ka ho eketseha ha mocheso, ka lebaka la thepa ea mocheso ea mocheso oa cellulose ether ka boeona, mokhatlo o moholo oa colloid o neng o entsoe pele o re li-disperses, tse lebisang ho fokotseha ha ts'ebetso ea ho boloka metsi.