Sezvo iyo huru yekunamatira ye putty, chiyero che redispersible latex powder chine simba pakusimba kwekubatanidza kweputty.Mufananidzo 1 unoratidza hukama huri pakati pehuwandu hwehuputi hunogadziriswa hwe latex powder uye kusimba kwechisungo.Sezvo zvinogona kuonekwa kubva kuMufananidzo 1, pamwe nekuwedzera kwehuwandu hwekugadzirisa zvakare kuparara kwe latex powder, simba rebhondi rinowedzera zvishoma nezvishoma. 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 hydrophilic latex poda uye chikamu chemvura chekusimudzira simende chinopinda mumapores uye capillary yematrix, iyo latex powder inoumba firimu mumapores uye capillaries uye inonamirwa adsorbed pamusoro pematrix, nokudaro kuve nechokwadi chekubatana kwakanaka pakati pesimende zvinhu 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 inodhispersible latex poda inowedzerwa, kune huwandu hukuru hwevoids muhurongwa, kana redispersible latex poda yawedzerwa, emulsion polymer inoumbwa mushure mekupararira zvakare inogona kunyura kuita firimu mune putty voids, kuvharira mavhodhi muputty system, uye kugadzira mushure mekugadzira firimu. kuomesa, nokudaro zvinobudirira kudzivirira kupinza kwemvura, kuderedza kuwanda kwekunyura kwemvura, kuitira kuti kuwedzeredzwa kwayo kwemvura. Kana iyo dosi yelatex poda yasvika 4%, iyo inodzokororwa yelatex poda uye iyo redispersible polymer emulsion inogona kunyatsozadza mavhodhi muputty system zvachose uye kugadzira firimu rakazara uye rakakora, nekudaro, tsika yekudzikira kwemvura yekunyura kweputty inova yakatsetseka nekuwedzera kwehuwandu hwelatex hupfu.
Nokuenzanisa mifananidzo yeSEM yeputty yakagadzirwa nekuwedzera redispersible latex powder kana kwete, zvinogona kuonekwa kuti mumufananidzo 3 (a) , iyo inorganic materials haina kusungirirwa zvakakwana, kune dzakawanda voids, uye voids haina kugoverwa zvakaenzana, naizvozvo, simba rayo rekubatana harina 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 in the whole putty system inogona kusungirirwa zvakanyanya, uye chaizvoizvo haina gap, saka inogona kuderedza kuiswa 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