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 (isitashi ether), i-fiber Fiber, njll.] kuxutshwe ukwenza udaka oluxubile.Lapho udaka olomile lwe-powder lufakwa emanzini futhi lunyakaziswa, ngaphansi kwesenzo se-hydrophilic protective colloid kanye namandla okugunda kwemishini, izinhlayiya ze-latex powder zingahlakazwa ngokushesha emanzini, okwanele ukwenza ifilimu ye-latex e-redispersible ngokugcwele.Ukwakheka kwempuphu yenjoloba kuhlukile, okunomthelela ku-rheology yodaka kanye nezakhiwo ezahlukahlukene zokwakha: ukuhlangana kwe-latex powder yamanzi lapho ihlakazwa kabusha, i-viscosity ehlukene ye-latex powder ngemva kokuhlakazeka, umphumela okuqukethwe komoya othulini kanye nokusatshalaliswa kwamabhamuza, Ukusebenzisana phakathi kwempushana yerabha nezinye izithasiselo kwenza izimpushana ze-latex ezihlukene zibe nemisebenzi yokwandisa uketshezi, ukwandisa i-thixotropy, nokwandisa 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 kwe-slurry. udaka lokwakha.
Ngemuva kokwakhiwa kodaka olusha oluqukethe i-latex powder dispersion, ngokumuncwa kwamanzi endaweni engaphansi, ukusetshenziswa kwe-hydration reaction, kanye nokushintshashintsha emoyeni, amanzi ayancipha kancane kancane, izinhlayiya ze-resin ziyasondela kancane kancane, isixhumi esibonakalayo siyafiphala kancane kancane. , futhi inhlaka 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 akunethiwekhi ayahwamuka ngokusebenzisa i-capillary, futhi ukungezwani okuphezulu kwe-capillary okufakwe ebusweni bezinhlayiya kubangela ukuguquguquka kwezinhlayiya ze-latex ukuze zihlangane, 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 esizacile esinokucindezeleka okukhulu.Ngokusobala, ukuze impushana ye-polymer 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 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 ngokusabalalisa i-latex powder ephindwe kabusha, engancibiliki emanzini, ayikwazi ukusebenza kuphela ezimweni ezomile, kodwa nasezimweni zokucwiliswa kwamanzi isikhathi eside.Yiqiniso, ezinhlelweni ezingezona ze-alkali, njenge-gypsum noma amasistimu anezigcwalisi kuphela, ngoba utshwala be-polyvinyl busekhona kancane kufilimu yokugcina ye-polymer, ethinta ukumelana kwamanzi kwefilimu, lapho lezi zinhlelo zingasetshenziselwa amanzi isikhathi eside. ukucwiliswa, futhi i-polymer isenazo 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, amandla okuguqula aphakeme 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 olulashiwe kancane kancane sidlula isigaba somkhiqizo we-inorganic hydration, udaka luzobhekana nezinguquko zekhwalithi futhi lube i-elastomer, futhi umkhiqizo we-hydration kasimende uzoba "ukugcwalisa" ".Amandla aqinile, ukuqina, ukuguquguquka kanye nezakhiwo zokuvala zodaka oluguquliwe nge-polymer powder ehlakazekayo kwathuthukiswa.Ukufakwa kwezimpushana ze-polymer ezihlakazekayo kuvumela ifilimu ye-polymer (ifilimu ye-latex) ukuthi yakhe futhi yakhe ingxenye yezindonga ze-pore, ngaleyo ndlela ivale isakhiwo esinezimbotshana eziphakeme kakhulu zodaka.Ulwelwesi lwe-latex lunomshini wokuzelula osebenzisa ingcindezi ekubambeleleni kwawo ngodaka.Ngala mandla angaphakathi, udaka lubanjwa lulonke, ngaleyo ndlela lukhulise amandla okuhlangana kwedaka.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 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