Redispersible latex powder kuyinto evame ukusetshenziswa organic gelling material.Kuyimpushana etholwe ngokufafaza i-emulsion ye-polymer nge-polyvinyl alcohol njenge-colloid evikelayo.Le mpushana ingahlakazwa ngokulinganayo emanzini ngemva kwamanzi okuhlangana., ukwakha i-emulsion.Ukwengeza i-latex powder ehlakazeka kabusha kungathuthukisa ukusebenza kokugcinwa kwamanzi kodaka lukasimende olusanda kuxutshwa, kanye nokusebenza kokubopha, ukuguquguquka, ukungakwazi ukubola kanye nokumelana nokugqwala kodaka lukasimende oluqinile.
Umthelela we-latexr powder emandleni ebhondi ezinto ezisekelwe kusimende
I-Emulsion kanye ne-latex powder ehlakazeka kabusha ingakha amandla aphezulu okuqinile namandla okubopha ezintweni ezahlukahlukene ngemuva kokwakhiwa kwefilimu, asetshenziswa njengesibophezelo sesibili odakeni ukuze kuhlanganiswe nosimende, usimende kanye ne-polymer ngokulandelana. ukusebenza kodaka.Ngokubheka ukwakheka kwe-microstructure ye-polymer-cement composite material, kunenkolelo yokuthi ukungezwa kwe-latex powder ehlakazekayo kungenza i-polymer ibe ifilimu futhi ibe yingxenye yodonga lwembobo, futhi yenze udaka lwakhiwe lonke ngokusebenzisa amandla angaphakathi, okuthuthukisa amandla angaphakathi odaka.Amandla e-polymer, ngaleyo ndlela athuthukise ingcindezi yokwehluleka kodaka futhi akhulise ubunzima bokugcina.Ukusebenza kwesikhathi eside kwe-latex powder ehlakazeka kabusha odakeni kwafundwa.Kwaphawulwa yi-SEM ukuthi ngemva kweminyaka eyi-10, i-microstructure ye-polymer odakeni ayizange ishintshe, futhi ukubopha okuzinzile, ukumelana nokuguquguquka nokucindezelwa kuye kwagcinwa.amandla kanye nokuxosha amanzi okuhle.I-latex powder ehlakazeka kabusha iye yafunda indlela yokwakheka kwamandla okunamathela kuthayela, futhi yathola ukuthi ngemva kokuba i-polymer isomile futhi yenziwe ifilimu, ifilimu ye-polymer yakha uxhumano oluguquguqukayo phakathi kodaka kanye nethayili ngakolunye uhlangothi, futhi ngakolunye uhlangothi. Ngakolunye uhlangothi, udaka olusha I-polymer ephakathi ikhulisa okuqukethwe komoya kodaka futhi ithinta ukwakheka kanye nokumanzisa kwendawo, futhi kamuva phakathi nenqubo yokubeka, i-polymer nayo ibe nomthelela ongcono ohlelweni lwe-hydration kanye nokushwabana kukasimende i-binder, konke Lokhu kuzosiza ukuthuthukisa amandla esibopho.
Ukwengeza impushana ye-latex ehlakazeka kabusha odakeni kungathuthukisa ngokuphawulekayo amandla okubopha nezinye izinto, ngoba i-hydrophilic latex powder kanye nesigaba esiwuketshezi sokumiswa kukasimende singena ezimbotsheni nasemacapillari e-matrix, futhi i-latex powder ingena ezimbotsheni nasemacapillari. .Ifilimu yangaphakathi iyakhiwa futhi ikhangiswe ngokuqinile ebusweni be-substrate, ngaleyo ndlela iqinisekise amandla esibopho esihle phakathi kwezinto zikasimende ne-substrate.
Ukulungiswa kwe-latex powder ekusebenzeni kodaka kubangelwa ukuthi i-latex powder iyi-polymer ephezulu yamangqamuzana namaqembu e-polar.Uma i-latex powder ixutshwa nezinhlayiya ze-EPS, ingxenye engeyona i-polar ochungechungeni oluyinhloko lwe-latex powder polymer izokwenza Ukukhangisa ngokomzimba kuzokwenzeka nge-non-polar surface ye-EPS.Amaqembu e-polar ku-polymer aqondiswe ngaphandle ebusweni bezinhlayiya ze-EPS, ukuze izinhlayiya ze-EPS zishintshe ukusuka ku-hydrophobicity kuya ku-hydrophilicity.Ngenxa yokuguqulwa kobuso bezinhlayiya ze-EPS nge-latex powder, ixazulula inkinga yokuthi izinhlayiya ze-EPS zivezwa kalula emanzini.Ukuntanta, inkinga yokwendlaleka okukhulu kodaka.Ngalesi sikhathi, lapho usimende wengezwa futhi uxutshwe, amaqembu e-polar adsorbed ebusweni bezinhlayiya ze-EPS asebenzisana nezinhlayiya ze-cement futhi ahlangane eduze, ukuze ukusebenza kwe-EPS insulation mortar kuthuthukiswe kakhulu.Lokhu kubonakala eqinisweni lokuthi izinhlayiya ze-EPS zimanziswa kalula ngokunamathisela usimende, futhi amandla okubopha phakathi kokubili athuthukiswa kakhulu.
Isikhathi sokuthumela: Mar-14-2023