Sezvo iyo huru yekunamatira ye putty, chiyero che redispersible latex powder chinokanganisa simba rekubatanidza re putty.Mufananidzo 1 unoratidza hukama huri pakati pehuwandu hwehuwandu hwehupfu hwehupfu uye simba rezvisungo.Sezvo zvinogona kuonekwa kubva kuMufananidzo 1, ne kuwedzera kwehuwandu hwe-re-dispersible latex powder, simba rezvisungo zvishoma nezvishoma rakawedzera.Kana huwandu hwe latex powder hushoma, simba rekubatanidza rinowedzera nekuwedzera kwehuwandu hwe latex powder.Kana iyo dosage ye emulsion powder iri 2% , simba rebhondi rinosvika 0182MPA, iyo inosangana nenyika ye0160MPA.Chikonzero ndechekuti iyo hydrophilic latex poda uye chikamu chemvura chesimende yekumisikidza chinopinda mukati me pores uye capillary yematrix, iyo latex poda inoumba firimu mumapores uye capillaries uye inonamirwa adsorbed pamusoro peiyo matrix, nekudaro kuve nechokwadi chakanaka. kusimba kwekubatanidza pakati pesimbi yekusimbisa uye matrix [4].Apo iyo putty inobviswa kubva mundiro yekuedza, inogona kuwanikwa kuti kuwedzera kwehuwandu hwe latex powder kunowedzera kusungirirwa kweputty kune substrate.Zvisinei, apo huwandu hwe latex powder hwakanga huri pamusoro pe4%, kuwedzera kwesimba rekubatanidza kwakaderedzwa.Kwete chete redispersible latex poda, asiwo inorganic zvinhu zvakaita semendi uye heavy calcium carbonate zvinopa kusimba rekubatanidza kweputty.
Kupokana kwemvura uye alkali kuramba kweputty indekisi yakakosha yekuyedza kutonga kuti putty inogona kushandiswa semvura inodzivirira mukati memadziro emukati kana ekunze madziro putty.Fig. 2 yakatsvaga mhedzisiro yehuwandu hwe-re-dispersible latex poda pakudzivirira kwemvura kweputty.
Sezvinogona kuonekwa kubva kuMufananidzo 2, apo chiyero che latex powder chiri pasi pe4%, nekuwedzera kwehuwandu hwe latex powder, chiyero chemvura chinoratidza kuderera.Kana iyo dosi yaive inopfuura 4%, mwero wekutora mvura wakadzikira zvishoma nezvishoma.Chikonzero ndechekuti simende ndiyo inosunga zvinhu muputty, kana pasina inodzokororwa latex poda inowedzerwa, kune huwandu hwakawanda hwevoids muhurongwa, kana redispersible latex poda yawedzerwa, iyo emulsion polymer inoumbwa mushure mekupararira zvakare inogona kudzika kuita firimu mu putty voids, simbisa iyo voids mu putty system, uye ita iyo putty coating uye kukwesha kuti igadzire denser firimu pamusoro mushure mekuoma, nekudaro kudzivirira zvinobudirira kupinza kwemvura, kuderedza kuwanda kwekunyura kwemvura, kuitira kuti iwedzere. kudzivirira mvura.Kana iyo dosage ye latex poda yasvika 4%, iyo inodzokororwa yelatex poda uye redispersible polymer emulsion inogona kunyatso kuzadza mavhodhi muputty system zvachose uye kuumba firimu rakazara uye rakakora, nekudaro, tsika yekudzikira kwemvura yekunyura kweputty. inova yakatsetseka nekuwedzera kwehuwandu hwe latex powder.
Nokuenzanisa mifananidzo yeSEM yeputty yakagadzirwa nekuwedzera redispersible latex powder kana kwete, zvinogona kuonekwa kuti muFig. 3 (a) , iyo inorganic materials haina kusungirirwa zvakakwana, kune zvakawanda voids, uye voids haina kugoverwa zvakafanana, saka, kusimba kwayo kwechisungo hakuna kunaka.Nhamba huru yevoids muhurongwa inoita kuti mvura ive nyore kupinza, saka chiyero chekunwa kwemvura chakakwira.Mumufananidzo 3 (b) , iyo emulsion polymer mushure mekupararira zvakare inogona kunyatsozadza voids mu putty system uye kuumba firimu rakazara, kuitira kuti inorganic material muputty system yese inogona kusungirirwa zvakanyanya, uye chaizvoizvo haina. Iva nemukaha, saka unogona kuderedza kunyura kwemvura yeputty.Tichifunga nezvesimba re latex powder pakusimba kwekubatanidza uye kushorwa kwemvura kweputty, uye tichifunga nezvemutengo we latex powder, 3% ~ 4% ye latex powder yakakodzera.Kugumisa redispersible latex powder kunogona kuvandudza simba rekubatanidza re putty.Kana muyero wayo uri 3% ~ 4%, putty ine yakakwirira yekubatanidza simba uye yakanaka kuramba mvura
Nguva yekutumira: Jul-19-2023