Ingcina yethayela esekwe kusimende iwukusetshenziswa okukhulu kakhulu kodaka olukhethekile lwamanje oluxutshwe okomile.Iwuhlobo lwengxube ye-organic noma ye-inorganic kanye nosimende njengento eyinhloko yokufaka usimende futhi yengezwe nge-aggregate yokugreda, i-ejenti yokugcina amanzi, i-ejenti yamandla yokuqala kanye nempushana ye-latex.ingxube.Ngokuvamile, idinga kuphela ukuxutshwa namanzi.Uma kuqhathaniswa nodaka olujwayelekile lukasimende, lungathuthukisa kakhulu amandla esibopho phakathi kwezinto ezibhekene ne-substrate, inendawo enhle yokulwa nokushelela futhi inokumelana okuhle kwamanzi nokumelana nokushisa.Ibuye isetshenziselwe umhlobiso wamathayela odonga angaphakathi nangaphandle, amathayili aphansi nezinye izinto zokuhlobisa.Isetshenziswa kabanzi ekuhlobiseni izindonga zangaphakathi nezangaphandle, phansi, izindlu zangasese, amakhishi, njll. Yithayela elisetshenziswa kakhulu.Impahla yokubopha.
Ngokuvamile, uma sahlulela ukusebenza kwe-adhesive ye-tile, kufanele sinake amandla ayo okusebenza kanye nesikhathi sokuvula ngaphezu kokusebenza kwayo kanye nekhono lokulwa nokushelela.Ngaphezu kokuthinta izakhiwo ze-rheological zenjoloba ye-porcelain, njengokushelela kokusebenza, isimo sommese onamathelayo, njll., i-cellulose ether inethonya elinamandla ezintweni zemishini ye-adhesive tile.
1. Isikhathi sokuvula
NiniI-polymer powder ehlakazeka kabushafuthii-cellulose etherukuhlalisana odakeni olumanzi, amanye amamodeli edatha abonisa ukuthi impushana yenjoloba inamandla anamandla e-kinetic axhunywe kumkhiqizo we-cement hydration, futhi i-cellulose ether ikhona kakhulu ku-interstitial fluid, ethinta kakhulu.I-viscosity nesikhathi sokubeka sodaka.Ukungezwani okungaphezulu kwe-cellulose ether kukhulu kunaleyo yempushana yerabha, futhi ukunothiswa kwe-cellulose ether eyengeziwe endaweni okusebenzela kuyo udaka kunenzuzo ukwakha ibhondi ye-hydrogen phakathi kwendawo eyisisekelo ne-cellulose ether.
Odakeni olumanzi, amanzi odaka ayahwamuka, i-cellulose ether iyacetshiswa phezulu, bese kwakheka ifilimu phezu kodaka phakathi nemizuzu emi-5, okunciphisa izinga lokuhwamuka okulandelayo, njengoba amanzi engeziwe eshubile asuka ebhodweni. udaka.Ingxenye yokuthuthela ongqimbeni oluncane longqimba lodaka, ukuvuleka kokuqala kolwelwesi kuncibilika kancane, futhi ukufuduka kwamanzi kuzoletha i-cellulose ether eyengeziwe ebusweni bodaka.
Ukwakhiwa kwefilimu ye-cellulose ether ebusweni bodaka kunethonya elikhulu ekusebenzeni kodaka:
Okokuqala, ifilimu eyakhiwe incane kakhulu, izohlakazwa kabili, ayikwazi ukukhawulela ukuhwamuka kwamanzi, ukunciphisa amandla.
Okwesibili, ifilimu eyakhiwe ikhulu kakhulu, ukuhlushwa kwe-cellulose ether ku-mortar interstitial fluid kuphezulu, futhi i-viscosity inkulu.Lapho i-tile inamathiselwe, akulula ukuphula ifilimu engaphezulu.
Kulokhu, kuyaqondakala ukuthi izakhiwo zefilimu ezakha i-cellulose ether zinethonya elikhulu ngesikhathi sokuvula.Uhlobo lwe-cellulose ether (HPMC,I-HEMC, MC, njll.) kanye nezinga le-etherification (i-degree of substitution) kuthinta ngokuqondile izakhiwo zefilimu ze-cellulose ether, kanye nobulukhuni nokuqina kwefilimu.
2.amandla
Ngaphezu kokudlulisela izici ezihlukahlukene ezizuzisayo ezichazwe ngenhla kudaka, i-cellulose ether ihlehlisa i-hydration kinetics kasimende.Lokhu kuncipha kubangelwa ikakhulukazi ukukhanyiswa kwama-molecule e-cellulose ether ezigabeni ezihlukahlukene zamaminerali ohlelweni lukasimende olunamanzi, kodwa ngokuvamile, ama-molecule e-cellulose ether adsorbed kakhulu emanzini njenge-CSH ne-calcium hydroxide.Emkhiqizweni wamakhemikhali, ayivamile ukukhangiswa esigabeni sokuqala samaminerali se-clinker.Ngaphezu kwalokho, ngenxa yokwanda kwe-viscosity yesisombululo se-pore, i-cellulose ether inciphisa ukuhamba kwe-ion (Ca2+, SO42-, ...) kusixazululo se-pore, ngaleyo ndlela ibambezeleka ngokwengeziwe inqubo ye-hydration.
I-viscosity ingenye ipharamitha ebalulekile emele izakhiwo zamakhemikhali ze-cellulose ethers.Njengoba kushiwo ngenhla, i-viscosity ithinta kakhulu amandla okugcina amanzi futhi iphinde ibe nomthelela omkhulu ekusebenzeni kodaka olusha.Nokho, izifundo zokuhlola zithole ukuthi i-viscosity ye-cellulose ether cishe ayinawo umthelela ku-hydration kinetics kasimende.Isisindo samangqamuzana sinomthelela omncane ku-hydration, futhi umehluko omkhulu phakathi kwezisindo zamangqamuzana ahlukene yimizuzu eyi-10 kuphela.Ngakho-ke, isisindo samangqamuzana asiyona ipharamitha eyinhloko yokulawula ukugeleza kukasimende.
"Ukusetshenziswa kwe-Cellulose Ether ku-Cement-Based Dry-mixed Mortar Products" isho ngokucacile ukuthi ukuvinjelwa kwe-cellulose ether kuncike ekwakhekeni kwamakhemikhali.Ukuthambekela okujwayelekile okufingqiwe ukuthi ku-MHEC, ukuphakama kwedigri ye-methylation, kuncane ukuncipha kwe-cellulose ether.Ukwengeza, ukushintshwa kwe-hydrophilic (njengokufaka esikhundleni se-HEC) kucindezela kakhulu kune-hydrophobic substitutions (njengokufaka esikhundleni se-MH, MHEC, MHPC).Umphumela wokuvinjelwa kwe-cellulose ether uthintwa ikakhulukazi amapharamitha amabili ohlobo nenani leqembu elingene esikhundleni.
Ukuhlolwa kwesistimu yethu kuphinde kwathola ukuthi okuqukethwe kwezinye izinto kudlala indima ebalulekile kumandla wemishini wokunamathela kuthayela.Sihlole ukusebenza kwe-HPMC ngamadigri ahlukene okushintsha endaweni yokunamathela kuthayela, futhi sahlola amapheya e-cellulose ether ngamaqembu ahlukene ngaphansi kwezimo ezihlukene zokuphulukisa.Umthelela wezakhiwo zemishini ye-adhesive tile, Umfanekiso 2 kanye no-Figure 3 yimiphumela yezinguquko kokuqukethwe kwe-methoxy (DS) nokuqukethwe kwe-hydroxypropoxy (MS) emandleni okudonsela phansi kwe-adhesive tile ekamelweni lokushisa.
Umfanekiso 2
Umfanekiso 3
Esivivinyweni, sicabangelaIHydroxypropyl methyl cellulose(HPMC), okuyi-ether eyinkimbinkimbi.Ngakho-ke, kufanele sihlanganise lezi zibalo ezimbili.Ku-HPMC, sidinga ukunikezwa ukuze siqinisekise ukuncibilika kwamanzi kanye nokudluliswa kokukhanya.Siyazi okuqukethwe esikhundleni.Iphinde inqume izinga lokushisa lejeli le-HPMC, elinquma indawo lapho i-HPMC isetshenziswa khona.Ngakho-ke, okuqukethwe kwe-HPMC evame ukusetshenziswa nakho kufakwe kuhlaka.Indlela yokuhlanganisa amaqembu e-methoxy ne-hydroxypropoxy kulolu hlu Ukuze sifinyelele imiphumela engcono kakhulu yilokho esikufundayo.Umfanekiso wesi-2 ubonisa ukuthi phakathi kwebanga elithile, ukwanda kokuqukethwe kwe-methoxyl kuzoletha ukuthambekela okuya phansi kwamandla okudonsa, kuyilapho okuqukethwe kwe-hydroxypropoxyl kuzokwanda futhi amandla okudonsa azokwanda.Ngesikhathi esivulekile, kunemiphumela efanayo.
Isikhathi sokuthumela: Dec-18-2018