Njengoko i-adhesive ephambili ye-putty, ubuninzi be-latex powder edibeneyo inefuthe kumandla okudibanisa i-putty.Umfanekiso we-1 ubonisa ubudlelwane phakathi komthamo we-latex owenziwe ngokutsha kunye nokuqina kwebhondi. Xa inani le-latex powder lincinci, amandla okudibanisa ayanda ngokunyuka kwenani le-latex powder. Ukuba i-dosage ye-emulsion powder yi-2%, amandla ebhondi afikelela kwi-0182MPA, ehlangabezana nomgangatho wesizwe we-0160MPA. Isizathu kukuba i-hydrophilic latex powder kunye nesigaba solwelo sokunqunyanyiswa kwesamente singena kwi-pores kunye ne-capillary ye-matrix, i-latex powder yenza ifilimu kwi-pores kunye ne-capillaries kwaye igxininiswe ngokuqinileyo kumphezulu we-matrix, ngaloo ndlela iqinisekisa amandla okudibanisa okulungileyo phakathi kwezinto ze-cementing kunye ne-matrix [4]. Xa i-putty isusiwe kwi-plate yokuvavanya, kunokufumaneka ukuba ukwanda komthamo we-latex powder kwandisa ukunamathela kwe-putty kwi-substrate. Nangona kunjalo, xa inani le-latex powder lalingaphezulu kwe-4%, ukwanda kwamandla okubambisana kwanciphisa. Ayisiyiyo kuphela i-latex powder echithwayo, kodwa kunye nezixhobo ze-inorganic ezifana ne-samente kunye ne-heavy calcium carbonate igalelo kumandla okudibanisa i-putty.
Ukuxhathisa kwamanzi kunye nokumelana ne-alkali ye-putty sisalathisi esibalulekileyo sokuvavanya ukuba i-putty ingasetyenziselwa ukuxhathisa amanzi kudonga lwangaphakathi okanye i-putty yodonga lwangaphandle. Umzobo we-2 uphande isiphumo somthamo we-latex ephinda ihlakazwe umgubo wokunganyangeki kwamanzi kwi-putty.
Njengoko kunokubonwa kwi-Figure 2, xa inani le-latex powder lingaphantsi kwe-4%, kunye nokunyuka komthamo we-latex powder, izinga lokungena kwamanzi libonisa ukuhla. Xa idosi yayingaphezulu kwe-4%, izinga lokufunxa amanzi lehla kancinci. Isizathu kukuba i-samente yinto ebophelelayo kwi-putty, xa kungekho mgubo we-latex odityanisiweyo wongezwayo, kukho ubuninzi be-voids kwinkqubo, xa i-latex powder yongezwa kwakhona, i-emulsion polymer eyenziwe emva kokusasazwa kwakhona inokujiya ibe yifilimu kwi-putty voids, itywine i-voids kwi-putty system kwi-putty yokufaka ifilimu, kwaye yenze i-putty coating emva komphezulu. ukomisa, ngaloo ndlela kuthintela ngokufanelekileyo ukungena kwamanzi, ukunciphisa umthamo wokufunxa kwamanzi, ukwenzela ukuba ukuxhathisa kwawo okuphuculweyo kwamanzi. Xa idosi ye-latex powder ifikelela kwi-4%, i-latex powder ephindwe kabini kunye ne-emulsion ye-polymer edispersible inokuthi ngokusisiseko izalise i-voids kwinkqubo ye-putty ngokupheleleyo kwaye yenze ifilimu epheleleyo kunye nexineneyo, ngoko ke, ukuthambekela kokuncipha kokufunxa kwamanzi kwi-putty kuya kuba lula kunye nokwanda komthamo we-latex powder.
Ngokuthelekisa imifanekiso ye-SEM ye-putty eyenziwe ngokongeza i-latex powder okanye i-redispersible powder okanye hayi, kunokubonwa ukuba kwi-Fig. 3 (a) izinto eziphathekayo azibopheli ngokupheleleyo, kukho ezininzi i-voids, kwaye i-voids ayisasazwanga ngokulinganayo, ngoko ke, amandla ayo okubopha ayifanelekanga. Inani elikhulu le-voids kwinkqubo yenza amanzi alula ukungena, ngoko ke izinga lokufunxa kwamanzi liphezulu. Kwi-Fig. 3 (b) i-emulsion polymer emva kokusasazwa kwakhona ingazalisa i-voids kwinkqubo ye-putty kwaye yenze ifilimu epheleleyo, ukwenzela ukuba i-inorganic material kuyo yonke inkqubo ye-putty ihlanganiswe ngokupheleleyo, kwaye ngokusisiseko ayinayo i-gap, ngoko inokunciphisa ukufunxa kwamanzi e-putty. Ukuqwalasela impembelelo ye-latex powder kwi-bonding amandla kunye nokuchasana kwamanzi kwe-putty, kwaye ukuqwalasela ixabiso le-latex powder, i-3% ~ 4% ye-latex powder ifanelekile.Ukugqitywa kwe-redispersible latex powder kunokuphucula amandla okubambisana kwe-putty. Xa i-dosage yayo i-3% ~ 4%, i-putty inamandla okudibanisa kunye nokuchasana kakuhle kwamanzi
Ixesha lokuposa: Jul-19-2023