I-EPS granular thermal insulation mortar iyinto yokushisa elula exutshwe nama-inorganic binders, ama-organic binders, ama-admixtures, izithasiselo kanye nama-light aggregates ngesilinganiso esithile. Phakathi kwama-EPS granular thermal insulation mortars acwaningwa futhi asetshenziswa njengamanje, ingaphinde isetshenziswe. I-Dispersed latex powder inethonya elikhulu ekusebenzeni kwe-mortar futhi ithatha isilinganiso esiphezulu sezindleko, ngakho-ke ibilokhu igxile ekunakweni kwabantu. Ukusebenza kokubopha kohlelo lwe-EPS particle insulation mortar lwangaphandle luvela kakhulu ku-polymer binder, futhi ukwakheka kwayo ikakhulukazi yi-vinyl acetate/ethylene copolymer. I-Redisperable latex powder ingatholakala ngokufutha nge-spray omisa lolu hlobo lwe-polymer emulsion. Ngenxa yokulungiswa okunembile, ukuthuthwa okulula kanye nokugcinwa okulula kwe-redisperable latex powder ekwakheni, i-latex powder ekhethekile ekhululekile isibe yindlela yokuthuthuka ngenxa yokulungiswa kwayo okunembile, ukuthuthwa okulula kanye nokugcinwa okulula. Ukusebenza kwe-EPS particle insulation mortar kuncike kakhulu ohlotsheni kanye nenani le-polymer esetshenzisiwe. I-Ethylene-vinyl acetate latexr powder (EVA) enokuqukethwe okuphezulu kwe-ethylene kanye nenani eliphansi le-Tg (izinga lokushisa lokushintsha kwengilazi) isebenza kangcono maqondana namandla okushaya, amandla okubopha kanye nokumelana namanzi.
Ukwenziwa ngcono kwempuphu ye-latex ekusebenzeni kahle kwe-mortar kungenxa yokuthi i-latex powder iyi-polymer ephezulu yama-molecule enamaqembu e-polar. Lapho i-latex powder ixutshwa nezinhlayiya ze-EPS, ingxenye engeyona i-polar eketangeni eliyinhloko le-latex powder polymer izokwenzeka. Ukumuncwa ngokomzimba kuzokwenzeka kanye nobuso obungeyona i-polar be-EPS. Amaqembu e-polar ku-polymer aqondiswe ngaphandle ebusweni bezinhlayiya ze-EPS, ukuze izinhlayiya ze-EPS zishintshe kusuka ekungangeni kwamanzi ziye ekungangeni kwamanzi. Ngenxa yokuguqulwa kobuso bezinhlayiya ze-EPS ngempuphu ye-latex, kuxazulula inkinga yokuthi izinhlayiya ze-EPS zivezwa kalula emanzini. Ukuntanta, inkinga yokufakwa okukhulu kwe-mortar. Ngalesi sikhathi, lapho i-samente ingezwa futhi ixutshwa, amaqembu e-polar afakwe ebusweni bezinhlayiya ze-EPS asebenzisana nezinhlayiya ze-samente futhi ahlangane eduze, ukuze ukusebenza kwe-EPS insulation mortar kuthuthukiswe kakhulu. Lokhu kubonakala eqinisweni lokuthi izinhlayiya ze-EPS zimanziswa kalula yi-cement paste, futhi amandla okubopha phakathi kwalezi zibili athuthukiswa kakhulu.
Impuphu ye-Emulsion kanye ne-latex echithwa kabusha ingakha amandla aphezulu okudonswa kanye namandla okubopha ezintweni ezahlukene ngemva kokwakheka kwefilimu, isetshenziswa njenge-binder yesibili ku-mortar ukuze ihlanganiswe ne-inorganic binder cement, i-cement kanye ne-polymer ngokulandelana. Nikeza amandla afanele ukuze kuthuthukiswe ukusebenza kwe-mortar. Ngokubheka isakhiwo esincane sezinto ezihlanganisiwe ze-polymer-cement, kukholelwa ukuthi ukungezwa kwempuphu ye-latex echithwa kabusha kungenza ifomu le-polymer libe ifilimu futhi libe yingxenye yodonga lwembobo, futhi kwenze ifomu le-mortar libe lilonke ngamandla angaphakathi, okuthuthukisa amandla angaphakathi e-mortar. Amandla e-polymer, ngaleyo ndlela kuthuthukiswe ukucindezeleka kokuhluleka kwe-mortar futhi kwandise ukucindezeleka kokugcina. Ukuze kufundwe ukusebenza kwesikhathi eside kwempuphu ye-latex echithwa kabusha ku-mortar, kwabonwa yi-SEM ukuthi ngemva kweminyaka eyi-10, isakhiwo se-polymer ku-mortar asikashintshi, sigcina ukubopha okuzinzile, amandla okuguquguquka nokucindezela kanye nokuxosha amanzi okuhle. Indlela yokwakheka kwamandla okunamathela kwethayela yafundwa ngempuphu ye-latex ephinde ihlakazeke, kwatholakala ukuthi ngemva kokuba i-polymer yomisiwe ibe yifilimu, ifilimu ye-polymer yakha uxhumano oluguquguqukayo phakathi kwe-mortar nethayela ngakolunye uhlangothi, kanti ngakolunye uhlangothi, i-polymer esesihlabathini ikhulisa okuqukethwe komoya wesihlabathini futhi ithinta ukwakheka kanye nokumanzika kobuso, futhi kamuva ngesikhathi senqubo yokusetha i-polymer nayo inethonya elihle enqubweni yokumanzisa kanye nokuncishiswa kwesimende esihlanganisweni. Konke lokhu kuzosiza ekuthuthukiseni amandla esibopho.
Ukwengeza i-latex powder ephinde ihlakazeke ku-mortar kungathuthukisa kakhulu amandla okubopha nezinye izinto, ngoba i-hydrophilic latex powder kanye nesigaba soketshezi sokumiswa kwe-cement singena ezimbotsheni nasezinkalweni ze-matrix, kanti i-latex powder ingena ezinkalweni nasezinkalweni ze-capillary. Ifilimu yangaphakathi iyakhiwa futhi inamathele ngokuqinile ebusweni be-substrate, ngaleyo ndlela iqinisekisa amandla amahle okubopha phakathi kwezinto ezisimende kanye ne-substrate.
Isikhathi sokuthunyelwe: Mashi-09-2023