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 ihlakazwa, 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 nokushintshashintsha emoyeni, amanzi azokwehla kancane kancane, izinhlayiya ze-resin zizosondela kancane kancane, ukuxhumana. 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 kwezinhlayiyana 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 bezinhlayiyana 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 ukwakha ifilimu yeqiniso eqhubekayo. Ngesikhathi sokwenziwa kwefilimu, izinhlayiya ze-latex ezihamba zodwa zihlangana zibe yisigaba esisha sefilimu esinokucindezeleka okukhulu. 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 lodaka.

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 i-samente 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 yokwanda kokucindezeleka 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.