Njenge-adhesive eyinhloko ye-putty, inani le-latex powder elihlakazeka kabusha linomthelela emandleni okubopha i-putty.Umfanekiso 1 ubonisa ubuhlobo phakathi kwenani le-latex powder elihlakazeka kabusha namandla esibopho.Njengoba kungabonakala ku-Figure 1, ngokunyuka kwenani le-latex powder ehlakazeka kabusha, amandla ebhondi akhula kancane kancane. Uma inani le-latex powder lincane, amandla okubopha akhula ngokunyuka kwenani le-latex powder. Uma isilinganiso se-emulsion powder singama-2%, amandla esibopho afinyelela ku-0182MPA, ehlangabezana nezinga likazwelonke le-0160MPA. Isizathu siwukuthi i-hydrophilic latex powder kanye nesigaba esiwuketshezi sokumiswa kukasimende singena ezimbotsheni kanye ne-capillary ye-matrix, i-latex powder yakha ifilimu kuma-pores nama-capillaries futhi igxiliwe ngokuqinile ebusweni be-matrix, ngaleyo ndlela iqinisekisa amandla amahle okubopha phakathi kwezinto zokuhlanganisa kanye ne-matrix [4]. Lapho i-putty isuswa epuleti yokuhlola, kungatholakala ukuthi ukwanda kwenani le-latex powder kwandisa ukunamathela kwe-putty ku-substrate. Kodwa-ke, lapho inani le-latex powder lingaphezu kuka-4%, ukwanda kwamandla okubopha kwancipha. Hhayi nje kuphela impushana ye-latex ehlakazeka kabusha, kodwa nezinto ezingaphili ezifana usimende ne-calcium carbonate esindayo zinomthelela emandleni okubopha i-putty.
Ukumelana namanzi nokumelana ne-alkali kwe-putty kuyinkomba ebalulekile yokuhlola ukuthi i-putty ingasetshenziswa yini njengokumelana namanzi odongeni lwangaphakathi noma i-putty yangaphandle yodonga. Umdwebo 2 uphenye umphumela yenani le-latex powder ehlakazeka kabusha ekuphikisweni kwamanzi kwe-putty.
Njengoba kungabonakala ku-Figure 2, lapho inani le-latex powder lingaphansi kuka-4%, ngokunyuka kwenani le-latex powder, izinga lokumunca amanzi libonisa umkhuba ophansi. Lapho umthamo usungaphezu kuka-4%, izinga lokumuncwa kwamanzi lehla kancane. Isizathu siwukuthi usimende uyinto ebophayo ku-putty, lapho ingekho i-latex powder eyongezwayo engeziwe, kuba nenani elikhulu le-voids ohlelweni, lapho i-latex powder yengezwa kabusha, i-emulsion polymer eyakhiwe ngemva kokuhlakazeka kabusha ingajiya ibe ifilimu ku-putty voids, ivale ama-voids ohlelweni lwe-putty ukuze yenze i-putty coating emva kwe-seerden. ukomisa, ngaleyo ndlela kuvimbela ngokuphumelelayo ukungena kwamanzi, ukunciphisa inani lokumuncwa kwamanzi, ukuze ukumelana kwawo kwamanzi kuthuthukiswe. Lapho isilinganiso se-latex powder sifinyelela ku-4%, i-latex powder ehlakazeka kabusha kanye ne-emulsion ye-polymer ehlakazeka kabusha ingagcwalisa ngokuphelele ama-voids ohlelweni lwe-putty futhi yakhe ifilimu ephelele neminyene, ngaleyo ndlela, ukuthambekela kokuncipha kokumuncwa kwamanzi kwe-putty kuba bushelelezi ngokwanda kwenani le-latex powder.
Ngokuqhathanisa izithombe ze-SEM ze-putty ezenziwe ngokungeza i-latex powder ephindwe kabusha noma cha, kungabonakala ukuthi ku-Fig. 3 (a) izinto ezisetshenziswayo azihlanganisiwe ngokugcwele, kukhona ama-voids amaningi, futhi ama-voids awasatshalaliswa ngokulinganayo, ngakho-ke, amandla ayo okubopha akulungile. Inani elikhulu lama-voids ohlelweni lenza amanzi angene kalula, ngakho izinga lokumuncwa kwamanzi liphezulu. Emfanekisweni wesi-3 (b) , i-emulsion polymer ngemva kokuhlakazeka kabusha ingagcwalisa ngokuyisisekelo ama-voids ohlelweni lwe-putty futhi yakhe ifilimu ephelele, ukuze izinto ezingaphili kulo lonke uhlelo lwe-putty ziboshwe ngokugcwele, futhi ngokuyisisekelo ayinalo igebe, ngakho-ke kunganciphisa ukumuncwa kwamanzi e-putty. Uma kucatshangelwa ithonya le-latex powder emandleni okubopha kanye nokumelana kwamanzi kwe-putty, futhi kucatshangelwa intengo ye-latex powder, i-3% ~ 4% ye-latex powder ifanelekile.Isiphetho se-redispersible latex powder singathuthukisa amandla okubopha we-putty. Lapho umthamo wayo ungu-3% ~ 4%, i-putty inamandla okubopha okuphezulu nokumelana okuhle kwamanzi
Isikhathi sokuthumela: Jul-19-2023