I-Mechanism ye-Redispersible Emulsion Powder ku-Dry Mix Mortar

Impushana ye-latex ehlakazeka kabusha nezinye izinto ezinamathelayo ezingaphili (ezifana nosimende, umcako owenziwe nge-slaked, igypsum, ubumba, njll.) kanye nezinhlobonhlobo ezihlukahlukene, izigcwalisi nezinye izithasiselo [ezifana ne-hydroxypropyl methylcellulose, i-polysaccharide (isitashi ether), i-fiber Fiber, njll.] odakeni oluxutshwe okomile ngokuxutshwa ngokomzimba.Lapho udaka olomile lwempuphu lufakwa emanzini futhi lunyakaziswa, ngaphansi kwesenzo se-hydrophilic protective colloid kanye ne-mechanical shear force, izinhlayiya ze-latex powder zingahlakazwa ngokushesha emanzini, okwanele ukwenza ngokugcwele i-latex powder ehlakazekayo ibe ifilimu.Ukwakheka kwempuphu yenjoloba kunemiphumela ehlukene ezakhiweni ze-rheological zodaka kanye nezakhiwo ezahlukahlukene zokwakha: ukuhlangana kwe-latex powder emanzini lapho ihlakazwa kabusha, ama-viscosities ahlukene we-latex powder ngemva kokuhlakazwa, umthelela wokuqukethwe komoya. kodaka kanye nokusatshalaliswa kwamabhamuza omoya, Ukusebenzisana phakathi kwempushana yenjoloba nezinye izithasiselo kwenza izimpushana ze-latex ezihlukene zibe nemiphumela yokwanda kwe-fluidity, ukwanda kwe-thixotropy, nokwanda kwe-viscosity.

Ngokuvamile kunenkolelo yokuthi indlela ye-latex powder ehlakazeka kabusha yokuthuthukisa ukusebenza kodaka olusha yilezi: ukuhlangana kwe-latex powder, ikakhulukazi i-colloid evikelayo, emanzini lapho ihlakazeka, kwandisa i-viscosity ye-slurry, futhi ithuthukise ukuhlangana kwe-slurry. udaka lokwakha.

Ngemuva kokwakhiwa kodaka olusanda kuxutshwa oluqukethe i-latex powder dispersion, ngokumuncwa kwamanzi endaweni engaphansi, ukusetshenziswa kwe-hydration reaction, kanye nokuvunguza emoyeni, amanzi azokwehla kancane kancane, izinhlayiya ze-resin zizosondela kancane kancane, i-interface. izofiphalisa kancane kancane, futhi ama-resin azohlangana kancane kancane.ekugcineni i-polymerized ibe ifilimu.Inqubo yokwakhiwa kwefilimu ye-polymer ihlukaniswe izigaba ezintathu.Esigabeni sokuqala, izinhlayiya ze-polymer zihamba ngokukhululekile ngesimo sokunyakaza kwe-Brownian ku-emulsion yokuqala.Njengoba amanzi ehwamuka, ukunyakaza kwezinhlayiya ngokwemvelo kukhawulelwe ngokwengeziwe, futhi ukungezwani kobuso phakathi kwamanzi nomoya kuyawaphoqa ukuthi aqondane kancane kancane.Esigabeni sesibili, lapho izinhlayiya zihlangana zodwa, amanzi akunethiwekhi ayahwamuka ngamashubhu e-capillary, futhi ukungezwani okuphezulu kwe-capillary okufakwe ebusweni bezinhlayiya kubangela ukuwohloka kwezinhlayiya ze-latex ukuze zihlangane, futhi amanzi asele agcwalisa ama-pores, futhi ifilimu yakhiwe cishe.Isigaba sesithathu, sokugcina sivumela ukusakazeka (ngezinye izikhathi okubizwa ngokuthi i-self-adhesion) yama-molecule e-polymer ukuze kwakhe ifilimu yeqiniso eqhubekayo.Ngesikhathi sokwenziwa kwefilimu, izinhlayiya ze-latex ezihamba zodwa zihlangana zibe yisigaba esisha sefilimu esinokucindezeleka okuphezulu.Ngokusobala, ukuze unike amandla i-polymer powder ehlakazeka kabusha ukuze yakhe ifilimu odakeni oluqinile, kuyadingeka ukuqinisekisa ukuthi izinga lokushisa elincane lokubumba ifilimu (MFT) liphansi kunezinga lokushisa lokuphulukisa likadaka.

Ama-Colloids - utshwala be-polyvinyl kufanele buhlukaniswe ohlelweni lwefilimu ye-polymer.Lokhu akuyona inkinga ohlelweni lodaka lukasimende lwe-alkaline, ngoba utshwala be-polyvinyl buzogcwaliswa yi-alkali ekhiqizwe yi-cement hydration, futhi ukukhangisa kwezinto ze-quartz kuzohlukanisa kancane kancane utshwala be-polyvinyl ohlelweni, ngaphandle kwe-hydrophilic protective colloid. , Ifilimu eyakhiwe ngokuhlakazeka kwesikhathi esisodwa kwe-latex powder ephinda ihlakazeka, yona ngokwayo engancibiliki emanzini, ayikwazi ukusebenza kuphela ezimweni ezomile, kodwa nasezimweni zokucwiliswa kwamanzi isikhathi eside.Yiqiniso, ezinhlelweni ezingezona ze-alkali, ezifana ne-gypsum noma izinhlelo zokugcwalisa kuphela, ngoba utshwala be-polyvinyl busekhona ingxenye yefilimu yokugcina ye-polymer, ethinta ukumelana kwamanzi kwefilimu, lapho lezi zinhlelo zingasetshenziselwa amanzi isikhathi eside. ukucwiliswa, futhi i-polymer isenezici zayo eziyingqayizivele zemishini, futhi i-polymer powder ehlakazeka kabusha isengasetshenziswa kulezi zinhlelo.

Ngokwakhiwa kokugcina kwefilimu ye-polymer, uhlelo olwakhiwe ngezakhiwo ze-inorganic kanye ne-organic binder kwakheka odakeni olulashiwe, okungukuthi, uhlaka lwamathambo oluqinile noluqinile olwakhiwe ngezinto ezisebenza nge-hydraulic, futhi i-latex powder ehlakazeka kabusha yakha ifilimu phakathi kwegebe kanye indawo eqinile.inethiwekhi eguquguqukayo.Amandla aqinile kanye nokuhlangana kwefilimu ye-polymer resin eyakhiwe yi-latex powder kuyathuthukiswa.Ngenxa yokuguquguquka kwe-polymer, amandla okuguqula aphakeme kakhulu kunesakhiwo esiqinile samatshe usimende, ukusebenza kwe-deformation yodaka kuyathuthukiswa, futhi umphumela wokuhlakazeka kwengcindezi uthuthukiswa kakhulu, ngaleyo ndlela kuthuthukiswe ukumelana nokuqhekeka kodaka. .

Ngokukhula kokuqukethwe kwempushana ye-latex ehlakazeka kabusha, lonke uhlelo luthuthukela kupulasitiki.Endabeni yokuqukethwe okuphezulu kwe-latex powder, isigaba se-polymer odakeni oluphulukisiwe kancane kancane sidlula isigaba somkhiqizo we-inorganic hydration, futhi udaka luzoshintsha ikhwalithi futhi lube i-elastomer, kuyilapho umkhiqizo we-hydration kasimende uba "ukugcwalisa".“.Amandla aqinile, ukuqina, ukuguquguquka kanye nokuvaleka kodaka oluguquliwe yi-latex powder ehlakazeka kabusha konke kuyathuthukiswa.Ukuhlanganiswa kwempushana ye-latex ehlakazeka kabusha kuvumela ifilimu ye-polymer (ifilimu ye-latex) ukuthi yakhe futhi yakhe ingxenye yezindonga zembobo, ngaleyo ndlela ivale isakhiwo esinezimbotshana zodaka.Ulwelwesi lwe-latex lunomshini wokuzelula osebenza kanzima lapho luboshelwe odakeni.Ngala mandla angaphakathi, udaka lugcinwa lulonke, ngaleyo ndlela lukhulise amandla okuhlangana kodaka.Ukuba khona kwama-polymers aguquguquka kakhulu futhi anwebeka kakhulu kuthuthukisa ukuguquguquka nokunwebeka kodaka.

Indlela yokwandisa ukucindezeleka kwesivuno namandla okuhluleka ingokulandelayo: lapho kusetshenziswa amandla, ama-microcracks abambezeleka kuze kufinyelelwe ukucindezeleka okuphezulu ngenxa yokuguquguquka okuthuthukisiwe nokunwebeka.Ukwengeza, izizinda ze-polymer ezihlanganisiwe futhi zivimbela ukuhlangana kwama-microcracks emifantwini engena.Ngakho-ke, i-polymer powder ehlakazeka kabusha ithuthukisa ukucindezelwa kokuhluleka kanye nokwehluleka kokusebenza kwezinto.

Ifilimu ye-polymer ku-polymer modified mortar inomphumela obaluleke kakhulu kudaka oluqinile.I-latex powder ehlakazeka kabusha esatshalaliswa kusixhumi esibonakalayo idlala enye indima ebalulekile ngemva kokuhlakazwa kanye nokwenza ifilimu, okuwukwandisa ukunamathela ezintweni ezithintwayo.Kusakhiwo esincane se-polymer eguquliwe ye-powder ye-tile bonding mortar kanye nesixhumi esibonakalayo sethayela, ifilimu elakhiwe i-polymer lakha ibhuloho phakathi kwamathayili acwebezelayo anokumunca amanzi aphansi kakhulu kanye ne-matrix yodaka lukasimende.Indawo yokuxhumana phakathi kwezinto ezimbili ezingafani iyindawo enobungozi obukhulu kakhulu yokuthi yakheke imifantu eshwabene futhi iholele ekulahlekeni kokubumbana.Ngakho-ke, ikhono lamafilimu e-latex lokuphulukisa imifantu ye-shrinkage libaluleke kakhulu kuma-adhesive tile.

Ngesikhathi esifanayo, i-latex powder ephinda ihlakazeka equkethe i-ethylene inokunamathela okuvelele kakhulu kuma-substrates e-organic, ikakhulukazi izinto ezifanayo, njenge-polyvinyl chloride ne-polystyrene.Isibonelo esihle uma kukhulunywa ngezifihla-buso.