Impushana ye-polymer ehlakazekayo nezinye izinto ezinamathelayo ezingaphili (ezifana nosimende, umcako owenziwe nge-slaked, igypsum, ubumba, njll.) kanye nama-aggregate ahlukahlukene, izigcwalisi nezinye izithasiselo [ezifana ne-hydroxypropyl methylcellulose, i-polysaccharide (i-starch ether), i-fiber Fiber, njll.] zixutshwa ngokomzimba ukwenza udaka oluxutshwe nelomile. Lapho udaka olomile lwe-powder lufakwa emanzini futhi lunyakaziswa, ngaphansi kwesenzo se-hydrophilic protective colloid kanye namandla okugcoba omshini, izinhlayiya ze-latex powder zingahlakazwa ngokushesha emanzini, okwanele ukwenza ifilimu ye-latex ephinda ihlakazeke ngokugcwele. Ukwakheka kwempuphu yenjoloba kuhlukile, okunomthelela ku-rheology yodaka kanye nezakhiwo ezahlukahlukene zokwakha: ukuhlangana kwe-latex powder emanzini lapho ihlakazwa kabusha, i-viscosity ehlukene ye-latex powder ngemva kokuhlakazwa, umphumela wokuqukethwe komoya wodaka kanye nokusatshalaliswa kwamagwebu, Ukusebenzisana phakathi kwempuphu yenjoloba nezinye izithasiselo kwenza ukwanda kwemisebenzi ye-latex ye-latex ibe nokwanda kwemisebenzi ye-latex powder. i-viscosity.
Ngokuvamile kunenkolelo yokuthi indlela i-latex powder ehlakazeka ngayo ithuthukisa ukusebenza kodaka olusha ukuthi i-latex powder, ikakhulukazi i-colloid evikelayo, inobudlelwane namanzi lapho ihlakazeka, okwandisa i-viscosity ye-slurry futhi ithuthukise ukuhlangana kodaka lokwakha.
Ngemva kokwakhiwa kodaka olusha oluqukethe i-latex powder dispersion, ngokumuncwa kwamanzi endaweni engaphansi, ukusetshenziswa kwe-hydration reaction, kanye nokuvuvukala emoyeni, amanzi ayancipha kancane kancane, izinhlayiya ze-resin ziyasondela kancane kancane, isixhumi esibonakalayo siyafiphala kancane kancane, futhi i-resin ihlangana 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 kubangela ukuthi kancane kancane ziqondane ndawonye. Esigabeni sesibili, lapho izinhlayiya ziqala ukuxhumana, amanzi kunethiwekhi ayahwamuka ngokusebenzisa i-capillary, futhi ukungezwani okuphezulu kwe-capillary okufakwe ebusweni bezinhlayiya kubangela ukuguqulwa kwezinhlayiya ze-latex ukuze zihlangane ndawonye, futhi amanzi asele agcwalisa ama-pores, futhi ifilimu yakhiwe cishe. Isigaba sesithathu nesokugcina sinika amandla ukusakazeka (ngezinye izikhathi okubizwa ngokuthi i-self-adhesion) yama-molecule e-polymer ukuze kwakhe ifilimu eqhubekayo ngempela. Ngesikhathi kwakhiwa ifilimu, izinhlayiya ze-latex ezihamba zodwa zihlangana zibe yisigaba esisha sefilimu esincanyana esinokucindezeleka okukhulu. Ngokusobala, ukuze i-polymer powder ehlakazekayo ikwazi ukwenza ifilimu odakeni oluqinisiwe, izinga lokushisa elincane lokubunjwa kwefilimu (MFT) kufanele liqinisekiswe ukuthi liphansi kunezinga lokushisa lokuphulukisa lodaka.
Ama-Colloids - utshwala be-polyvinyl kufanele buhlukaniswe ohlelweni lwe-polymer membrane. Lokhu akuyona inkinga ohlelweni lwe-alkaline Cement mortar, ngoba utshwala be-polyvinyl buzogcwaliswa yi-alkali eyenziwe yi-cement hydration, futhi ukukhanyiswa kwezinto ze-quartz kuzohlukanisa kancane kancane utshwala be-polyvinyl ohlelweni, ngaphandle kwe-hydrophilic protective colloid. , Ifilimu eyakhiwe ngokusabalalisa i-latex powder ephindwe kabusha, engancibiliki emanzini, ayikwazi ukusebenza kuphela ezimweni ezomile, kodwa nasezimweni zokucwiliswa kwamanzi isikhathi eside. Yiqiniso, ezinhlelweni ezingezona ezine-alkali, njenge-gypsum noma izinhlelo ezinezigcwalisi kuphela, njengoba i-polyvinyl alcohol isekhona ingxenye yokugcina yefilimu ye-polymer, ethinta ukumelana kwamanzi kwefilimu, lapho lezi zinhlelo zingasetshenziselwa ukucwiliswa kwamanzi isikhathi eside , futhi i-polymer isenayo izici zayo zemishini, i-polymer powder ehlakazekayo isengasetshenziswa kulezi zinhlelo.
Ngokubunjwa kokugcina kwefilimu ye-polymer, uhlelo olwakhiwe ngezibophezelo ze-inorganic kanye ne-organic kwakheka odakeni olulashiwe, okungukuthi, uhlaka lwamathambo oluqinile futhi oluqinile olwakhiwe ngezinto ezisebenza nge-hydraulic, futhi i-polymer powder ehlakazeka kabusha yenziwa endaweni yegebe nendawo eqinile. inethiwekhi eguquguqukayo. Amandla aqinile kanye nokuhlangana kwefilimu ye-polymer resin eyakhiwe yi-latex powder kuyathuthukiswa. Ngenxa yokuguquguquka kwe-polymer, umthamo we-deformation uphakeme kakhulu kunesakhiwo esiqinile setshe likasimende, ukusebenza kwe-deformation yodaka kuyathuthukiswa, futhi umphumela wokuhlakazeka kwengcindezi uthuthukiswa kakhulu, ngaleyo ndlela kuthuthukiswe ukumelana nokuqhekeka kodaka.
Ngokukhula kokuqukethwe kwe-polymer powder ehlakazekayo, lonke uhlelo luthuthukela kupulasitiki. Endabeni yokuqukethwe okuphezulu kwe-latex powder, isigaba se-polymer odakeni oluphulukisiwe kancane kancane sidlula isigaba somkhiqizo we-inorganic hydration, udaka luzobhekana nezinguquko zekhwalithi futhi lube i-elastomer, futhi umkhiqizo we-hydration kasimende uzoba "i-filler" ". ifilimu ye-polymer (ifilimu ye-latex) ukuze yakhe futhi yenze ingxenye yezindonga ze-pore, ngaleyo ndlela ivale isakhiwo esinezimbotshana zodaka I-membrane ye-latex ine-self-stretching mechanism esebenza ukungezwani ku-anchorage yayo ne-mortar. Indlela yokwandisa ukucindezeleka kwesivuno namandla okuhluleka ingokulandelayo: lapho kusetshenziswa amandla, ama-microcracks abambezeleka ngenxa yokuthuthukiswa kokuguquguquka nokunwebeka, futhi awakhi kuze kufinyelelwe ukucindezeleka okuphezulu. Ukwengeza, izizinda ze-polymer ezihlanganisiwe futhi zivimbela ukuhlanganiswa kwama-microcracks abe yi- through-cracks. Ngakho-ke, i-polymer powder ehlakazekayo ikhulisa ukucindezeleka kokuhluleka kanye nokwehluleka kokusebenza kwezinto.
Ifilimu ye-polymer odakeni lwe-polymer-modified inomphumela obaluleke kakhulu ekuqineni kodaka. I-polymer powder ehlakazeka kabusha esatshalaliswa kusixhumi esibonakalayo idlala enye indima ebalulekile ngemva kokuhlakazwa futhi yenziwe ifilimu, okuwukwandisa ukunamathela ezintweni ezithintana nazo. Kusakhiwo esincane sendawo yokusebenzelana phakathi kodaka lwebhondi yethayela le-polymer olushintshiwe lwe-polymer kanye nethayela le-ceramic, ifilimu eyenziwe i-polymer yenza ibhuloho phakathi kwethayela le-vitrified ceramic elimunca amanzi eliphansi kakhulu kanye ne-matrix yodaka lukasimende. Indawo yokuxhumana phakathi kwezinto ezimbili ezingafani iyindawo ekhethekile enobungozi obukhulu lapho imifantu ye-shrinkage yakheka futhi iholele ekulahlekelweni kokunamathela. Ngakho-ke, ikhono lamafilimu e-latex lokuphulukisa imifantu ye-shrinkage idlala indima ebalulekile kuma-adhesive tile.
Ngesikhathi esifanayo, i-polymer powder ephinda ihlakazeka equkethe i-ethylene inokunamathela okuvelele kakhulu kuma-substrates e-organic, ikakhulukazi izinto ezifanayo, njenge-polyvinyl chloride ne-polystyrene. Isibonelo esihle se
Isikhathi sokuthumela: Oct-31-2022