I-Redispersible latex powder iyinto esetshenziswa kakhulu njenge-organic gelling material, engaphinde ihlakazwe ngokulinganayo emanzini ukuze yakhe i-emulsion ngemva kokuthintana namanzi. Ukwengeza i-redispersible latex powder kungathuthukisa ukusebenza kokugcinwa kwamanzi kwe-samente esanda kuhlanganiswa, kanye nokusebenza kokubopha, ukuguquguquka, ukungangeni kwamanzi kanye nokumelana nokugqwala kwe-samente eqinile. I-latex powder ishintsha ukuhambisana nokushelela kwesistimu esimweni sokuxuba esimanzi, futhi ukuhlangana kuyathuthukiswa ngokufaka i-latex powder. Ngemva kokomisa, inikeza ungqimba olubushelelezi noluqinile olunamandla okuhlangana, futhi ithuthukisa umphumela wokuxhumana wesihlabathi, amatshe ayigugu kanye nama-pores. , ecebile ibe yifilimu esibonakalayo, okwenza izinto ziguquguquke kakhulu, inciphise i-elastic modulus, imunce ukucindezeleka kokuguquguquka kokushisa ngezinga elikhulu, futhi inokumelana namanzi esigabeni sakamuva, futhi izinga lokushisa le-buffer kanye nokuguquguquka kwezinto akuhambisani.
Ukwakheka kwefilimu ye-polymer eqhubekayo kubaluleke kakhulu ekusebenzeni kwezingcezu ze-cement eziguqulwe nge-polymer. Ngesikhathi sokusetha nokuqinisa i-cement paste, kuzokhiqizwa imigodi eminingi ngaphakathi, eba yizingxenye ezibuthakathaka ze-cement paste. Ngemva kokuthi i-latex powder ephinde ihlakazeke ingeziwe, i-latex powder izosakazeka ngokushesha ibe yi-emulsion lapho ihlangana namanzi, bese ihlangana endaweni ecebile ngamanzi (okungukuthi, emgodini). Njengoba i-cement paste iqina futhi iqina, ukunyakaza kwezinhlayiya ze-polymer kuya ngokuya kuncishiswa, futhi ukungezwani phakathi kwamanzi nomoya kuyaphoqa ukuthi kuhambisane kancane kancane. Lapho izinhlayiya ze-polymer zihlangana, inethiwekhi yamanzi iyahwamuka ngama-capillary, futhi i-polymer yakha ifilimu eqhubekayo ezungeze umgodi, iqinisa lezi zindawo ezibuthakathaka. Ngalesi sikhathi, ifilimu ye-polymer ayikwazi nje ukudlala indima ye-hydrophobic, kodwa futhi ayikwazi ukuvimba i-capillary, ukuze izinto zibe ne-hydrophobic enhle kanye nokuvuleka komoya.
Udaka lukasimende olungenayo i-polymer luxhumene kakhulu. Ngokuphambene nalokho, udaka lukasimende olushintshiwe lwe-polymer lwenza lonke udaka luxhumene kakhulu ngenxa yokuba khona kwefilimu ye-polymer, ngaleyo ndlela luthole izakhiwo ezingcono zomshini kanye nobulili bokumelana nesimo sezulu. Kudaka lukasimende olushintshiwe lwe-latex powder, i-latex powder izokwandisa ukuqina kwe-cement paste, kodwa inciphise ukuqina kwendawo yokushintshana phakathi kwe-cement paste kanye ne-aggregate, okuholela ekutheni ukuqina kodaka kungashintshi. Ngemva kokuba i-latex powder yenziwe ifilimu, ingavimba kangcono ama-pores ku-mortar, yenze isakhiwo se-interface transition zone phakathi kwe-cement paste kanye ne-aggregate sibe sikhulu kakhulu, futhi ukumelana kokungena kwe-latex powder modified mortar kuyathuthuka, futhi ikhono lokumelana nokuguguleka kwemidiya eyingozi liyathuthuka. Inethonya elihle ekuthuthukiseni ukuqina kodaka.
Isikhathi sokuthunyelwe: Mashi-14-2023