Mhedzisiro yeambient tembiricha pakushanda kwe cellulose ether yakagadziridzwa gypsum

Kuitwa kwe cellulose ether yakagadziridzwa gypsum pane akasiyana ambient tembiricha yakasiyana kwazvo, asi maitiro ayo haana kujeka. Mhedzisiro ye cellulose ether pane rheological parameters uye kuchengetwa kwemvura yegypsum slurry pane dzakasiyana tembiricha ambient dzakadzidzwa. Iyo hydrodynamic dhayamita ye cellulose ether muchikamu chemvura yakayerwa nenzira ine simba yekuparadzira mwenje, uye maitiro epesvedzero akaongororwa. Mhedzisiro yacho inoratidza kuti cellulose ether ine yakanaka kuchengetedza mvura uye kukora mhedzisiro pagypsum. Nekuwedzera kwe cellulose ether content, viscosity ye slurry inowedzera uye simba rekuchengetedza mvura rinowedzera. Nekudaro, nekuwedzera kwekushisa, iyo mvura inochengetedza simba yeyakagadziridzwa gypsum slurry inodzikira kune imwe nhanho, uye rheological parameters zvakare inoshanduka. Tichifunga kuti cellulose ether colloid association inogona kuwana kuchengetwa kwemvura nekuvhara nzira yekufambisa yemvura, kukwira kwekushisa kunogona kutungamirira mukuparara kwehuwandu hwehuwandu hwehuwandu hunobudiswa ne cellulose ether, nokudaro kuderedza kuchengetwa kwemvura uye kushanda kwekushanda kwegypsum yakagadziridzwa.

Mazwi akakosha:gypsum; Cellulose ether; Tembiricha; Kuchengetedza mvura; rheology

0. Nhanganyaya

Gypsum, semhando yezvakatipoteredza zvine hushamwari zvinhu zvine kuvaka kwakanaka uye zvimiro zvemuviri, inoshandiswa zvakanyanya mumapurojekiti ekushongedza. Mukushandiswa kwegypsum based materials, mvura inochengetedza mumiririri inowanzowedzerwa kushandura slurry kudzivirira kurasikirwa kwemvura mukuita hydration uye kuoma. Cellulose ether ndiyo inonyanya kushandiswa kuchengetedza mvura parizvino. Nekuti ionic CE ichaita neCa2+, kazhinji inoshandisa isiri-ionic CE, yakadai se: hydroxypropyl methyl cellulose ether, hydroxyethyl methyl cellulose ether uye methyl cellulose ether. Izvo zvakakosha kuti udzidze zvimiro zve cellulose ether yakagadziridzwa gypsum yekushandisa zvirinani gypsum mukushongedza engineering.

Cellulose ether ndeyepamusoro molecular compound inogadzirwa nekuita kwealkali cellulose uye etherifying agent pasi pemamwe mamiriro. Iyo nonionic cellulose ether inoshandiswa muinjiniya yekuvaka ine kupararira kwakanaka, kuchengetwa kwemvura, kubatana uye kukora mhedzisiro. Kuwedzerwa kwe cellulose ether kune mhedzisiro iri pachena pakuchengetedza mvura yegypsum, asi kukotama uye kumanikidza simba regypsum yakaomeswa muviri inodzikirawo zvishoma nekuwedzera kwehuwandu hwekuwedzera. Izvi zvinodaro nekuti cellulose ether ine imwe mweya intraining mhedzisiro, iyo inozounza mabhubhu mukuita kwekusanganiswa kwe slurry, nekudaro kudzikisa michina yemuviri wakaoma. Panguva imwecheteyo, yakawandisa cellulose ether ichaita kuti gypsum musanganiswa inamire zvakanyanya, zvichikonzera kushanda kwayo kwekuvaka.

Iyo hydration process yegypsum inogona kukamurwa kuita matanho mana: kupera kwe calcium sulfate hemihydrate, crystallization nucleation ye calcium sulfate dihydrate, kukura kwekristaro nucleus uye kuumbwa kwekristaro chimiro. Mune hydration process yegypsum, iyo hydrophilic inoshanda boka re cellulose ether inoshambadza pamusoro peiyo gypsum particles inogadzirisa chikamu chemamorekuru emvura, nokudaro inonotsa iyo nucleation process yegypsum hydration uye kuwedzera nguva yekugadzika yegypsum. Kuburikidza neSEM yekucherechedza, Mroz akawana kuti kunyange zvazvo kuvapo kwe cellulose ether kwakanonoka kukura kwemakristasi, asi kwakawedzera kupindirana uye kuunganidza makristasi.

Cellulose ether ine hydrophilic mapoka kuitira kuti ive neimwe hydrophilicity, polymer refu cheni inobatanidza kune imwe neimwe kuitira kuti ive nepamusoro viscosity, kupindirana kwezviviri kunoita kuti cellulose ive yakanaka inochengetedza mvura-inokora mhedzisiro pane gypsum musanganiswa. Bulichen akatsanangura nzira yekuchengetedza mvura ye cellulose ether mu simenti. Pakusanganiswa kwakaderera, cellulose ether adsorb pane simende yekunyura mumvura ye intramolecular uye inoperekedzwa nekuzvimba kuti iwane kuchengetedza mvura. Panguva ino, kuchengetwa kwemvura kwakashata. Yakakwira dosage, cellulose ether inoumba mazana ema nanometers kune mashoma mamicrons ecolloidal polymer, inonyatso kuvharira iyo gel system mugomba, kuti iwane kuchengetedzeka kwemvura. Maitiro ekuita kwe cellulose ether mugypsum yakafanana neyemu simenti, asi iyo yepamusoro SO42-concentration muchikamu chemvura yegypsum slurry inoderedza simba rekuchengetedza mvura ye cellulose.

Kubva pane zviri pamusoro apa, zvinogona kuwanikwa kuti tsvakiridzo yazvino nezve cellulose ether yakagadziridzwa gypsum inonyanya kutarisisa pane hydration process ye cellulose ether pane gypsum musanganiswa, kuchengetedza mvura zvivakwa, mechanical zvimiro uye microstructure yemuviri wakaoma, uye mashandiro e cellulose ether. kuchengetedza mvura. Nekudaro, chidzidzo chekudyidzana pakati pe cellulose ether uye gypsum slurry pakupisa kwepamusoro haisati yakwana. Cellulose ether aqueous solution ichaita gelatinize pane imwe tembiricha. Sezvo tembiricha inowedzera, viscosity ye cellulose ether aqueous solution inoderera zvishoma nezvishoma. Kana tembiricha yegelatinization yasvika, cellulose ether inonatswa kuita jena gel. Semuenzaniso, mukuvakwa kwezhizha, tembiricha yakadzika yakakwira, iyo thermal gel zvimiro zve cellulose ether inosungirwa kutungamirira kune shanduko mukushanda kweiyo yakagadziridzwa gypsum slurry. Iri basa rinoongorora mhedzisiro yekukwira kwetembiricha pakushanda kwe cellulose ether yakagadziridzwa gypsum zvinhu kuburikidza nekuongorora kwakarongeka, uye inopa nhungamiro yekushandiswa kunoshanda kweselulosi ether yakagadziridzwa gypsum.

1. Kuedza

1.1 Raw Materials

Gypsum ndiyo β-mhando yekuvaka gypsum yakapihwa neBeijing Ecological Home Group.

Cellulose ether yakasarudzwa kubva kuShandong Yiteng Group hydroxypropyl methyl cellulose ether, zvigadzirwa zve 75,000 mPa · s, 100,000 mPa · s uye 200000mPa · s, gelation tembiricha iri pamusoro pe60 ℃. Citric acid yakasarudzwa segypsum retarder.

1.2 Rheology Test

Iyo rheological test instrument yakashandiswa yaive RST⁃CC rheometer yakagadzirwa neBROOKFIELD USA. Rheological parameters yakadai sepurasitiki viscosity uye goho shear stress yegypsum slurry yakatemwa neMBT⁃40F⁃0046 sampuli yemudziyo uye CC3⁃40 rotor, uye data yakagadziriswa neRHE3000 software.

Hunhu hwekusanganiswa kwegypsum hunoenderana nemaitiro erheological eBingham fluid, anowanzo kudzidzwa uchishandisa Bingham modhi. Nekudaro, nekuda kwepseudoplasticity ye cellulose ether yakawedzerwa kune polymer-yakagadziridzwa gypsum, musanganiswa we slurry unowanzo ratidza imwe shear kutetepa pfuma. Muchiitiko ichi, yakagadziridzwa Bingham (M⁃B) modhi inogona kutsanangura zvirinani iyo rheological curve yegypsum. Kuti udzidze shear deformation yegypsum, basa iri rinoshandisawo Herschel⁃Bulkley (H⁃B) modhi.

1.3 Muedzo wekuchengetedza mvura

Nzira yekuedza inoreva GB/T28627⁃2012 Plastering Plaster. Munguva yekuyedza tembiricha seyachinjika, gypsum yakafanopiswa 1h pachine nguva yekupisa kunoenderana muchoto, uye mvura yakasanganiswa yakashandiswa mukuyedza yakapiswa 1h mutembiricha inoenderana mukugezesa kwemvura kunogara kuchipisa, uye chiridzwa chakashandiswa. was preheated.

1.4 Hydrodynamic dhayamita bvunzo

Iyo hydrodynamic dhayamita (D50) yeHPMC polymer kushamwaridzana muchikamu chemvura yakayerwa uchishandisa ine simba mwenje inoparadzira particle size analyzer (Malvern Zetasizer NanoZS90).

2. Migumisiro uye nhaurirano

2.1 Rheological zvimiro zveHPMC yakagadziridzwa gypsum

Apparrent viscosity ireshiyo yeshear stress kusvika kushear rate ichiita pamvura uye iparameter inoratidza kuyerera kwemvura isiri yeNewtonian. Iyo inooneka viscosity yeiyo yakagadziridzwa gypsum slurry yakashandurwa nezviri mukati me cellulose ether pasi pezvirevo zvitatu zvakasiyana (75000mPa · s, 100,000mpa ·s uye 200000mPa · s). Tembiricha yekuyedza yaive 20 ℃. Kana shear rate ye rheometer iri 14min-1, inogona kuwanikwa kuti viscosity yegypsum slurry inowedzera nekuwedzera kweHPMC kubatanidzwa, uye iyo yakakwirira iyo HPMC viscosity iri, iyo yakakwirira viscosity yemodified gypsum slurry ichave. Izvi zvinoratidza kuti HPMC ine kukora kuri pachena uye viscosification mhedzisiro pane gypsum slurry. Gypsum slurry uye cellulose ether zvinhu zvine imwe viscosity. Mumusanganiswa wegypsum wakagadziriswa, cellulose ether inoshambadzirwa pamusoro pezvigadzirwa zvegypsum hydration, uye network inoumbwa ne cellulose ether uye network inoumbwa negypsum mix inobatanidzwa, zvichiita kuti "superposition effect", iyo inovandudza zvakanyanya viscosity yose ye. iyo yakagadziridzwa gypsum yakavakirwa zvinhu.

Iyo shear ⁃ stress curves ye pure gypsum (G⁃H) uye modified gypsum (G⁃H) paste doped ne 75000mPa· s-HPMC, sekufungidzira kubva kune yakadzokororwa Bingham (M⁃B) modhi. Inogona kuwanikwa kuti nekuwedzera kweshear rate, shear stress yemusanganiswa inowedzerawo. Iyo plastiki viscosity (ηp) uye goho shear stress (τ0) kukosha kweiyo gypsum yakachena uye HPMC yakagadziridzwa gypsum patembiricha dzakasiyana inowanikwa.

Kubva papurasitiki viscosity (ηp) uye goho shear stress (τ0) kukosha kweiyo pure gypsum uye HPMC yakagadziridzwa gypsum patembiricha dzakasiyana, zvinogona kuonekwa kuti goho rekushushikana kweHPMC rakagadziridzwa gypsum richaramba richiderera nekuwedzera kwekushisa, uye goho. kushushikana kunodzikira 33% pa60 ℃ zvichienzaniswa ne20 ℃. Nekutarisa epurasitiki viscosity curve, zvinogona kuwanikwa kuti iyo yepurasitiki viscosity yemodified gypsum slurry inodzikirawo nekuwedzera kwekushisa. Nekudaro, iyo goho kushushikana uye epurasitiki viscosity yeyakachena gypsum slurry inowedzera zvishoma nekuwedzera kwekushisa, izvo zvinoratidza kuti shanduko yerheological parameters yeHPMC yakagadziridzwa gypsum slurry mukuita kwekuwedzera tembiricha kunokonzerwa nekushandurwa kweiyo HPMC zvinhu.

Iko kushushikana kwegoho kukosha kwegypsum slurry kunoratidza iyo yakanyanya shear stress kukosha kana iyo slurry inopesana neshear deformation. Iyo yakakura kukosha kwekushushikana kwegoho, iyo yakanyanya kugadzikana iyo gypsum slurry inogona kuva. Iyo plastiki viscosity inoratidza deformation rate yegypsum slurry. Iyo yakakura iyo plastiki viscosity ndeye, iyo yakareba iyo shear deformation nguva ye slurry ichave. Mukupedzisa, iwo maviri rheological paramita yeHPMC yakagadziridzwa gypsum slurry inodzikira zviri pachena nekuwedzera kwekushisa, uye kukora mhedzisiro yeHPMC pane gypsum slurry haina simba.

Deformation ye shear ye slurry inoreva kukora kweshear kana kuti shear thinning effect inotaridzwa neslurry kana yaiswa simba rekugera. Iyo shear deformation effect ye slurry inogona kutongwa ne pseudoplastic index n inowanikwa kubva kune yakakodzera curve. Kana n <1, gypsum slurry inoratidza kuveura kutetepa, uye shear thinning degree yegypsum slurry inova yakakwirira nekudzikira kwen. Kana n> 1, gypsum slurry yakaratidza kuchekwa kweshear, uye shear thickening degree yegypsum slurry yakawedzera nekuwedzera kwe n. Rheological curves yeHPMC yakagadziridzwa gypsum slurry patembiricha dzakasiyana zvichienderana neHerschel⁃Bulkley (H⁃B) modhi yakakodzera, saka tora iyo pseudoplastic index n yeHPMC yakagadziridzwa gypsum slurry.

Zvinoenderana neiyo pseudoplastic index n yeHPMC yakagadziridzwa gypsum slurry, shear deformation yegypsum slurry yakasanganiswa neHPMC ndeyekuveura kutetepa, uye kukosha kwen kunowedzera zvishoma nezvishoma nekuwedzera kwekushisa, izvo zvinoratidza kuti shear kutetepa maitiro eHPMC yakagadziridzwa gypsum ichaita. kupedzwa simba kusvika kumwero wakati kana kukanganiswa netembiricha.

Zvichienderana nezvinooneka viscosity shanduko yeiyo yakagadziridzwa gypsum slurry ine shear rate yakaverengerwa kubva shear stress data ye75000 mPa · HPMC pakudziya kwakasiyana, zvinogona kuwanikwa kuti epurasitiki viscosity yeakagadziridzwa gypsum slurry inoderera nekukurumidza nekuwedzera kweshear rate, iyo inosimbisa mhedzisiro yakakodzera yeiyo H⁃B modhi. Iyo yakagadziridzwa gypsum slurry yakaratidza shear kuonda maitiro. Nekuwedzera kwekushisa, iyo inooneka viscosity yemusanganiswa inoderera kusvika kune imwe nhanho pakaderera shear rate, iyo inoratidza kuti shear kuonda mhedzisiro yeiyo yakagadziridzwa gypsum slurry inopera simba.

Mukushandiswa chaiko kwegypsum putty, gypsum slurry inodiwa kuti ive nyore kukanganisa mukukwesha uye kuti irambe yakagadzikana pakuzorora, izvo zvinoda gypsum slurry kuti ive yakanaka shear kutetepa maitiro, uye shear shanduko yeHPMC yakagadziridzwa gypsum haiwanzo kuita. imwe nhanho, iyo isingakodzeri kuvakwa kwezvinhu zvegypsum. Iyo viscosity yeHPMC ndeimwe yeakakosha paramita, uye zvakare chikonzero chikuru chekuti inotora basa rekukora kuvandudza hunhu hwakasiyana hwekusanganisa kuyerera. Cellulose ether pachayo ine maitiro eiyo inopisa gel, viscosity yeaqueous solution yayo inoderera zvishoma nezvishoma sezvo tembiricha inowedzera, uye gel chena inonaya kana ichisvika tembiricha yegelation. Shanduko yerheological parameters ye cellulose ether yakagadziridzwa gypsum ine tembiricha yakabatana zvakanyanya nekuchinja kwe viscosity, nekuti iyo thickening mhedzisiro ndiyo mhedzisiro ye superposition ye cellulose ether uye yakasanganiswa slurry. Muinjiniya inoshanda, kukanganisa kwekushisa kwezvakatipoteredza pane HPMC kuita kunofanirwa kutariswa. Semuenzaniso, tembiricha yezvinhu zvakasvibirira inofanirwa kudzorwa mukupisa kwakanyanya muzhizha kudzivirira kusashanda zvakanaka kwegypsum yakagadziridzwa inokonzerwa nekupisa kwakanyanya.

2.2 Kuchengetwa kwemvura kweHPMC yakagadziridzwa gypsum

Kuchengetedzwa kwemvura kwegypsum slurry yakagadziridzwa nemitsara mitatu yakasiyana ye cellulose ether inochinjwa nedosage curve. Nekuwedzera kweHPMC dosage, mwero wekuchengetedza mvura wegypsum slurry unovandudzwa zvakanyanya, uye maitiro ekuwedzera anogadzikana kana HPMC dosi yasvika 0.3%. Pakupedzisira, chiyero chekuchengetedza mvura yegypsum slurry yakagadzikana pa90% ~ 95%. Izvi zvinoratidza kuti HPMC ine pachena-inochengetedza mvura paste paste paste, asi mvura-yekuchengetedza maitiro haina kuvandudzwa zvakanyanya sezvo dosi iri kuramba ichiwedzera. Zvitatu zvinotsanangurwa zveHPMC mvura yekuchengeta chiyero musiyano haisi yakakura, semuenzaniso, kana zvirimo zviri 0.3%, chiyero chekuchengetedza mvura iri 5%, iyo yakajairwa kutsauka ndeye 2.2. HPMC ine viscosity yepamusoro-soro haisi yepamusoro-soro yekuchengetedza mvura, uye HPMC ine viscosity yakaderera haisi iyo yakaderera mvura yekuchengetedza. Nekudaro, kana zvichienzaniswa neiyo yakachena gypsum, mwero wekuchengetedza mvura yevatatu HPMC yegypsum slurry inovandudzwa zvakanyanya, uye chiyero chekuchengetedza mvura yegypsum yakagadziridzwa mu0.3% yemukati inowedzerwa ne95%, 106%, 97% zvichienzaniswa ne blank control group. Cellulose ether inogona pachena kuvandudza kuchengetwa kwemvura yegypsum slurry. Nekuwedzera kwehuwandu hweHPMC, mwero wekuchengetedza mvura weHPMC yakagadziridzwa gypsum slurry ine viscosity yakasiyana zvishoma nezvishoma inosvika pakuzara. 10000mPa · sHPMC yakasvika pakuzara pa 0.3%, 75000mPa · s uye 20000mPa · s HPMC yakasvika pakuzara pa 0.2%. Mhedzisiro yacho inoratidza kuti kuchengetwa kwemvura kwe75000mPa·s HPMC yakagadziridzwa gypsum inoshanduka netembiricha pasi peyero yakasiyana. Nekudzikira kwetembiricha, mwero wekuchengetedza mvura weHPMC yakagadziridzwa gypsum unodzikira zvishoma nezvishoma, nepo mwero wekuchengetedza mvura yepure gypsum unoramba usina kuchinjika, zvichiratidza kuti kuwedzera kwetembiricha kunoderedza kuchengetwa kwemvura kweHPMC pagypsum. Huwandu hwekuchengetedza mvura hweHPMC hwakadzikira ne31.5% apo tembiricha yakawedzera kubva pa20 ℃ kusvika 40℃. Kana tembiricha yakwira kubva pa40 ℃ kuenda pa60 ℃, mwero wekuchengetedza mvura weHPMC yakagadziridzwa gypsum wakangofanana newakachena gypsum, zvichiratidza kuti HPMC yarasikirwa nemhedzisiro yekuvandudza kuchengetwa kwemvura kwegypsum panguva ino. Jian Jian naWang Peiming vakakurudzira kuti cellulose ether pachayo ine thermal gel phenomenon, shanduko yetembiricha inotungamira kune shanduko mune viscosity, morphology uye adsorption ye cellulose ether, iyo inosungirwa kutungamirira kune shanduko mukuita kwe slurry mix. Bulichen akawanawo kuti dynamic viscosity yesimende mhinduro ine HPMC yakadzikira nekuwedzera tembiricha.

Kuchinja kwekuchengetedza mvura yemusanganiswa kunokonzerwa nekuwedzera kwekushisa kunofanira kusanganiswa nemaitiro e cellulose ether. Bulichen akatsanangura nzira iyo cellulose ether inogona kuchengetedza mvura mu simenti. Mune simende-yakavakirwa masisitimu, HPMC inonatsiridza mwero wekuchengetedza mvura yeslurry nekudzikisa kupera kwe "sefa keke" inoumbwa nesimende system. Kumwe kusanganisirwa kweHPMC muchikamu chemvura kunoumba mazana akati wandei emamita kune mashoma mamicrons ekubatana kwecolloidal, iyi ine imwe vhoriyamu yepolymer chimiro inogona kunyatso plug nzira yekufambisa yemvura mumusanganiswa, kuderedza kupera kwe "sefa keke", kuti uwane kuchengetedza kwemvura kwakanaka. Bulichen yakaratidzawo kuti HPMCS mugypsum inoratidza maitiro akafanana. Naizvozvo, kudzidza kweiyo hydromechanical dhayamita yemubatanidzwa yakaumbwa neHPMC muchikamu chemvura inogona kutsanangura mhedzisiro yeHPMC pakuchengetedza mvura kwegypsum.

2.3 Hydrodynamic dhayamita yeHPMC colloid association

Particle kugovera macurves e75000mPa · s HPMC muchikamu chemvura, uye particle division curves ezvitatu zvakatemwa zveHPMC muchikamu chemvura pahuwandu hwe0.6%. Iyo inogona kuvonekwa kubva kuchikamu chekugovera curve yeHPMC yezvitatu zvakatsanangurwa muchikamu chemvura kana iyo yekumisikidza iri 0.6% iyo, nekuwedzera kweHPMC kusungwa, saizi yechikamu cheakasanganiswa akaumbwa muchikamu chemvura inowedzerawo. Kana iko kusungirirwa kwadzikira, zvimedu zvinoumbwa neHPMC kuunganidzwa zvidiki, uye chikamu chidiki chete cheHPMC chinoungana kuita zvidimbu zve100nm. Kana HPMC yakasungwa iri 1%, kune huwandu hukuru hwekubatana kwecolloidal ine hydrodynamic dhayamita ingangoita 300nm, chinova chiratidzo chakakosha chekupindirana kwema molecular. Iyi "hombe vhoriyamu" chimiro chepolymerization inogona kuvharisa nzira yekufambisa yemvura mumusanganiswa, kuderedza "permeability yekeke", uye kuchengetwa kwemvura kunowirirana kwegypsum musanganiswa pakusangana uku kwakakurawo kupfuura 90%. Iwo hydromechanical madhayamita eHPMC ane maviscosities akasiyana muchikamu chemvura anongofanana, ayo anotsanangura iwo akafanana ekuchengetedza mvura mwero weHPMC yakagadziridzwa gypsum slurry ine akasiyana viscosities.

Particle saizi yekugovera macurves e75000mPa·s HPMC ine 1% yekumisikidza pane tembiricha dzakasiyana. Nekuwedzera kwekushisa, kuparara kweHPMC colloidal kushamwaridzana kunogona kuwanikwa pachena. Pa40 ℃, iyo hombe ye300nm kushamwaridzana yakanyangarika zvachose uye yakaora kuita diki vhoriyamu zvidimbu zve15nm. Nekuwedzera kwekuwedzera kwekushisa, HPMC inova zvidimbu zvidiki, uye kuchengetwa kwemvura kwegypsum slurry kwakarasika zvachose.

Chiitiko cheHPMC zvinhu chinoshanduka nekukwira kwekushisa chinonziwo hot gel properties, maonero aripo akajairwa ndeokuti pakudziya kwakaderera, HPMC macromolecules anotanga kuparadzirwa mumvura kuti anyunguduse mhinduro, HPMC mamorekuru ari muhupamhi hwepamusoro anoumba hombe particle association. . Kana tembiricha ichikwira, iyo hydration yeHPMC inodzikira, mvura iri pakati pemaketani inoburitswa zvishoma nezvishoma, iyo huru yemubatanidzwa makomisheni inoparadzirwa zvishoma nezvishoma kuita zvidimbu zvidiki, viscosity yemhinduro inoderera, uye matatu-dimensional network inoumbwa kana gelation. tembiricha inosvika, uye gel chena inonaya.

Bodvik akawana kuti iyo microstructure uye adsorption zvimiro zveHPMC muchikamu chemvura zvakashandurwa. Yakasanganiswa neBulichen's theory yeHPMC colloidal association ichivharira slurry mvura yekufambisa chiteshi, zvakagumiswa kuti kuwedzera kwekushisa kwakakonzera kuparara kweHPMC colloidal association, zvichikonzera kudzikira kwekuchengetwa kwemvura kwegypsum yakagadziridzwa.

3. Mhedziso

(1) Cellulose ether pachayo ine yakakwira viscosity uye "superimposed" mhedzisiro ine gypsum slurry, ichiridza zviri pachena kukora mhedzisiro. Patembiricha yekamuri, iko kukora mhedzisiro inova pachena nekuwedzera kwe viscosity uye dosi ye cellulose ether. Nekudaro, nekuwedzera kwekushisa, viscosity ye cellulose ether inodzikira, kukora kwayo kunoderera, goho rekuveura kushushikana uye epurasitiki viscosity yegypsum musanganiswa inoderera, iyo pseudoplasticity inoderera, uye nzvimbo yekuvaka inowedzera.

(2) Cellulose ether yakavandudza kuchengetwa kwemvura yegypsum, asi nekuwedzera kwekushisa, kuchengetwa kwemvura kwegypsum yakagadziridzwa kwakadererawo zvakanyanya, kunyange pa60 ℃ icharasikirwa zvachose nekugadzirisa kwekuchengetedza mvura. Mwero wekuchengetedza mvura wegypsum slurry wakagadziridzwa zvakanyanya ne cellulose ether, uye mwero wekuchengetedza mvura weHPMC yakagadziridzwa gypsum slurry ine viscosity yakasiyana zvishoma nezvishoma yakasvika pakuzara nekuwedzera kwedosi. Kuchengetwa kwemvura yeGypsum kunowanzo kuenzana neiyo viscosity ye cellulose ether, pakakwirira viscosity haina mhedzisiro.

(3) Zvinhu zvemukati zvinoshandura kuchengetwa kwemvura ye cellulose ether ine tembiricha yakanyatsoenderana neiyo microscopic morphology ye cellulose ether muchikamu chemvura. Pane imwe nzvimbo, cellulose ether inowanzoungana kuti igadzire masangano makuru ecolloidal, ichivharira nzira yekufambisa yemvura yemusanganiswa wegypsum kuti uwane kuchengetwa kwemvura kwakakwira. Nekudaro, nekuwedzera kwekushisa, nekuda kweiyo thermal gelation pfuma ye cellulose ether pachayo, iyo yakamboumbwa yakakura colloid association redisperses, zvichikonzera kuderera kwekuita kwekuchengetedza mvura.