I-adhesive yethayela ingenye yezinhlelo zokusebenza ezinkulu kakhulu zodaka olukhethekile oluxutshwe okomile njengamanje. Lolu uhlobo lukasimende njengezinto zikasimende eziyinhloko futhi zengezwe ama-aggregate asezingeni, ama-ejenti okugcina amanzi, ama-ejenti wamandla okuqala, impushana ye-latex nezinye izithasiselo eziphilayo noma ezingaphili. ingxube. Ngokuvamile, idinga kuphela ukuxutshwa namanzi lapho isetshenziswa. Uma kuqhathaniswa nodaka olujwayelekile lukasimende, lungathuthukisa kakhulu amandla okubopha phakathi kwezinto ezibhekene ne-substrate, inokumelana nokushelela okuhle futhi inokumelana okuhle kwamanzi nokumelana nokushisa. Futhi izinzuzo zokumelana nomjikelezo we-freeze-thaw, ikakhulukazi osetshenziselwa ukunamathisela amathayela odonga lwangaphakathi nangaphandle, amathayela aphansi nezinye izinto zokuhlobisa, ezisetshenziswa kakhulu ezindongeni zangaphakathi nangaphandle, phansi, izindlu zangasese, amakhishi nezinye izindawo zokuhlobisa izakhiwo, okwamanje Izinto ezisetshenziswa kakhulu ze-ceramic tile bonding.
Ngokuvamile lapho sahlulela ukusebenza kwe-adhesive ye-tile, asigcini nje ukunaka ukusebenza kwayo nokusebenza nekhono lokulwa nokuslayida, kodwa futhi sinake amandla ayo emishini kanye nesikhathi sokuvula.I-cellulose etherku-adhesive tile ayithinti kuphela izakhiwo ze-rheological ze-adhesive porcelain, njengokusebenza okubushelelezi, ukunamathela kommese, njll., kodwa futhi kunethonya elinamandla ezintweni zemishini yokunamathisela i-tile. Umthelela ngesikhathi sokuvula sokunamathela kwethayela
Lapho i-emulsion powder kanye ne-cellulose ether zikhona endaweni emanzi, enye idatha ibonisa ukuthi i-emulsion powder inamandla e-kinetic anamandla okunamathisela emikhiqizweni ye-cement hydration, futhi i-cellulose ether ikhona kakhulu ku-interstitial fluid, okuthinta udaka lwe-viscosity eyengeziwe kanye nesikhathi sokusetha. Ukungezwani okungaphezulu kwe-cellulose ether kungaphezulu kwalokho kwempushana ye-emulsion, futhi ukunothiswa kwe-cellulose ether okwengeziwe kusixhumi esibonakalayo sosimende kuzoba yinzuzo ekwakhekeni kwebhondi ye-hydrogen phakathi kwesisekelo sesisekelo ne-cellulose ether.
Odakeni olumanzi, amanzi odaka ayahwamuka, futhi i-cellulose ether iyacetshiswa phezulu, futhi ifilimu izokwakhiwa ebusweni bodaka kungakapheli imizuzu emi-5, okuzonciphisa izinga lokuhwamuka okulandelayo, njengoba amanzi engeziwe ekhishwa. isuswe odakeni olujiyile Ingxenye yayo ithuthela ongqimbeni oluncane lodaka, futhi ifilimu eyakhiwe ekuqaleni iyancibilika kancane, futhi ukufuduka kwamanzi kuzoletha ukunothisa kwe-cellulose ether ngaphezulu kodaka.
Ngakho-ke, ukwakheka kwefilimu ye-cellulose ether ebusweni bodaka kunethonya elikhulu ekusebenzeni kodaka.
I-1) Ifilimu eyenziwe incane kakhulu futhi izohlakazwa kabili, ayikwazi ukukhawulela ukuhwamuka kwamanzi nokunciphisa amandla.
2) Ifilimu eyenziwe iminyene kakhulu, ukuhlushwa kwe-cellulose ether oketshezini lwe-mortar interstitial kuphezulu, futhi i-viscosity iphezulu, ngakho-ke akulula ukuphula ifilimu engaphezulu lapho amathayili enamathiselwe.
Kungabonakala ukuthi izakhiwo zefilimu ze-cellulose ether zinomthelela omkhulu ngesikhathi esivulekile. Uhlobo lwe-cellulose ether (i-HPMC, i-HEMC, i-MC, njll.) kanye nezinga le-etherification (i-substitution degree) kuthinta ngokuqondile izakhiwo zefilimu ze-cellulose ether, kanye nobulukhuni nokuqina kwefilimu.
Ngaphezu kokudlulisela izici ezinenzuzo ezishiwo ngenhla odakeni, i-cellulose ether iphinde ibambezele i-hydration kinetics kasimende. Lo mphumela wokuvinjelwa ubangelwa ikakhulukazi ukukhangisa kwama-molecule e-cellulose ether ezigabeni ezihlukahlukene zamaminerali ohlelweni lukasimende olunikezwa amanzi, kodwa ngokuvamile, ukuvumelana ukuthi ama-molecule e-cellulose ether adsorbed kakhulu emanzini afana ne-CSH ne-calcium hydroxide. Emikhiqizweni yamakhemikhali, ayivamile ukukhangisa esigabeni sokuqala samaminerali se-clinker. Ngaphezu kwalokho, i-cellulose ether inciphisa ukuhamba kwe-ion (Ca2+, SO42-, ...) kusixazululo se-pore ngenxa yokwanda kwe-viscosity yesisombululo se-pore, ngaleyo ndlela kubambezeleka ngokwengeziwe inqubo ye-hydration.
I-Viscosity ingenye ipharamitha ebalulekile, emele izici zamakhemikhali ze-cellulose ether. Njengoba kushiwo ngenhla, i-viscosity ithinta kakhulu amandla okugcina amanzi futhi iphinde ibe nomthelela omkhulu ekusebenzeni kodaka olusha. Kodwa-ke, izifundo zokuhlola zithole ukuthi i-viscosity ye-cellulose ether cishe ayinawo umthelela kuma-kinetics we-cement hydration. Isisindo se-molecular sinomthelela omncane ku-hydration, futhi umehluko omkhulu phakathi kwezisindo zamangqamuzana ahlukene yi-10min kuphela. Ngakho-ke, isisindo samangqamuzana asiyona ipharamitha eyinhloko yokulawula ukugeleza kukasimende.
"Ukusetshenziswa kwe-Cellulose Ether ku-Cement-Based Dry-Mixed Mortar Products" kubonise ukuthi ukuvinjelwa kwe-cellulose ether kuncike ekwakhekeni kwamakhemikhali. Futhi ukuthambekela okuvamile okuphethwe ukuthi ku-MHEC, izinga eliphezulu le-methylation, liba mncane umphumela wokuvinjelwa kwe-cellulose ether. Ukwengeza, umphumela wokuhlehlisa we-hydrophilic substitution (njengokufaka esikhundleni se-HEC) unamandla kunalowo we-hydrophobic substitution (njengokufaka esikhundleni se-MH, MHEC, MHPC). Umthelela wokuhlehlisa we-cellulose ether uthintwa ikakhulukazi amapharamitha amabili, uhlobo nenani lamaqembu abambele.
Ukuhlolwa kwesistimu kuphinde kwathola ukuthi okuqukethwe kwezinye izinto kudlala indima ebalulekile kumandla wokunamathisela amathayela. Ku-HPMC, izinga elithile lokuhlinzekwa liyadingeka ukuze kuqinisekiswe ukunyibilika kwayo kwamanzi kanye nokudluliswa kokukhanya. Okuqukethwe kwezinye izindawo kuphinde kunqume amandla e-HPMC. Izinga lokushisa lejeli liphinde linqume indawo yokusebenzisa ye-HPMC. Phakathi kwebanga elithile, ukwanda kokuqukethwe kwamaqembu e-methoxyl kuzoletha ukuthambekela okuphansi kwamandla okudonsa, kuyilapho ukwanda kokuqukethwe kwamaqembu e-hydroxypropoxyl kuzoholela ekwehleni kwamandla okudonsa. umkhuba okhulayo. Kunomphumela ofanayo wamahora okuvula.
Ukushintsha kwesimo samandla emishini ngaphansi kwesimo sesikhathi esivulekile sihambisana nalokho ngaphansi kwezimo ezijwayelekile zokushisa. I-HPMC enokuqukethwe okuphezulu kwe-methoxyl (DS) nokuqukethwe kwe-hydroxypropoxyl (MS) ephansi inokuqina okuhle kwefilimu, kodwa izothinta udaka olumanzi ngokuphambene nalokho. izinto zokumanzisa izakhiwo.
Isikhathi sokuthumela: Dec-12-2022