Dispersible polymer poda uye mamwe inorganic adhesives (zvakadai semende, slaked lime, gypsum, ivhu, etc.) uye zvakasiyana-siyana aggregates, fillers uye zvimwe zvinowedzera [zvakadai sehydroxypropyl methylcellulose, polysaccharide (starch ether), fiber Fiber, nezvimwewo] zvinosanganiswa mumuviri kuita dhaka yakaoma-yakasanganiswa. Kana iyo yakaoma poda dhaka inowedzerwa kumvura uye yakabvongodzwa, pasi pekuita kwehydrophilic inodzivirira colloid uye mechanical shearing simba, latex powder particles inogona kukurumidza kuparadzirwa mumvura, izvo zvakakwana kuita kuti redispersible latex powder zvizere firimu. Kuumbwa kwerabha poda kwakasiyana, iyo ine mhedzisiro pane rheology yedhaka uye akasiyana ekuvaka zvivakwa: kuwirirana kwelatex poda yemvura kana yaparadzirwa, iyo yakasiyana viscosity yelatex powder mushure mekupararira, mhedzisiro pamhepo yedhaka uye kuparadzirwa kwemabhuru, Kudyidzana pakati pehupfu yerabha uye zvimwe zvinowedzera, kuwedzera kwakasiyana kwehupfu hwehupfu hunoita kuti huwedzere hushoma hwehupfu. viscosity.
Zvinowanzotendwa kuti iyo nzira iyo inodzokororwa yelatex poda inovandudza kushanda kwedhaka nyowani ndeyekuti latex poda, kunyanya inodzivirira colloid, ine hukama hwemvura kana yakapararira, iyo inowedzera viscosity ye slurry uye inovandudza kubatana kwedhaka rekuvaka.
Mushure mekunge dhaka idzva rine latex poda dispersion yaumbwa, nekutorwa kwemvura nepasi pevhu, kushandiswa kwe hydration reaction, uye kuvhuvhuta kumhepo, mvura inodzikira zvishoma nezvishoma, zvimedu zve resin zvishoma nezvishoma zvinosvika, iyo interface inodzima zvishoma nezvishoma, uye resin zvishoma nezvishoma inobatana. pakupedzisira polymerized kuita firimu. Maitiro ekuumbwa kwemafirimu epolymer akakamurwa kuita matanho matatu. Muchikamu chekutanga, zvikamu zvepolymer zvinofamba zvakasununguka muchimiro cheBrownian motion mune yekutanga emulsion. Sezvo mvura inoputika, kufamba kwezvikamu zvinowanzoitika uye zvakanyanya kurambidzwa, uye kusawirirana kwepakati pemvura nemhepo kunokonzera kuti zvishoma nezvishoma zvibatane pamwe chete. Muchikamu chechipiri, apo zvidimbu zvinotanga kusangana, mvura iri mumambure inoputika kuburikidza ne capillary, uye iyo yakakwirira capillary tension inoshandiswa pamusoro pezvikamu zvinokonzera deformation ye latex spheres kuti iite fuse pamwe chete, uye mvura yakasara inozadza pores, uye firimu inoumbwa zvakanyanyisa. Danho rechitatu uye rekupedzisira rinogonesa kupararira (dzimwe nguva kunonzi kuzvidzora) kwemamorekuru epolymer kuumba firimu rinoenderera. Munguva yekugadzira firimu, iyo yakasarudzika mobile latex particles inobatana kuita itsva nhete yefirimu chikamu nekunyanya kushushikana. Zviripachena, kuitira kuti iyo inorasika yepolymer hupfu inokwanisa kuumba firimu mudhaka rakaomeswa, tembiricha yekugadzira firimu (MFT) inofanira kuvimbiswa kuve yakaderera pane kupisa tembiricha yedhaka.
Colloids - polyvinyl doro rinofanira kuparadzaniswa kubva kune polymer membrane system. Iri harisi dambudziko mune alkaline simende mortar system, nekuti iyo polyvinyl doro ichave saponified nealkali inogadzirwa nesamende hydration, uye adsorption yeiyo quartz zvinhu zvishoma nezvishoma ichaparadzanisa polyvinyl doro kubva muhurongwa, pasina iyo hydrophilic inodzivirira colloid. , Iyo firimu inoumbwa nekuparadzira redispersible latex powder, iyo isingagadziriswi mumvura, haigoni kushanda mumamiriro ezvinhu akaoma, asiwo mumamiriro emvura akareba kwenguva refu. Ehe, mune isiri-alkaline masisitimu, senge gypsum kana masisitimu ane mafirita chete, sezvo polyvinyl doro richiri muchikamu chekupedzisira chepolymer firimu, izvo zvinokanganisa kurwisa kwemvura kwefirimu, kana masisitimu aya asingashandisi kunyudzwa mumvura kwenguva refu , uye iyo polima ichine hunhu hwayo hwemakina, disperible polymer poda inogona kushandiswa mune idzi masisitimu.
Nekuumbwa kwekupedzisira kweiyo polymer firimu, sisitimu inoumbwa neinorganic uye organic binders inoumbwa mudhaka rakaporeswa, ndiko kuti, brittle uye yakaoma skeleton inoumbwa nezvinhu zvehydraulic, uye redispersible polymer poda inoumbwa mugomba uye yakasimba pamusoro. flexible network. Kusimba kwekusimba uye kubatana kwepolymer resin firimu inogadzirwa nelatex poda inowedzerwa. Nekuda kwekuchinjika kwepolymer, iyo deformation simba yakakwira zvakanyanya kupfuura yakaomesesa chimiro chesimende, iyo deformation kuita kwedhaka inovandudzwa, uye mhedzisiro yekuparadzira kushushikana inovandudzwa zvakanyanya, nekudaro ichivandudza kutsemuka kwedhaka.
Nekuwedzera kwezviri mukati mepolymer poda inorasika, iyo system yese inokura yakananga kupurasitiki. Panyaya yehuwandu hwe latex powder, chikamu chepolymer mudhaka yakarapwa zvishoma nezvishoma chinodarika inorganic hydration chigadzirwa chikamu, dhaka richaita shanduko yemhando uye ikava elastomer, uye hydration chigadzirwa chesimende chichava "filler". firimu repolymer (latex film) kuti iite uye iite chikamu chemadziro emadziro, nokudaro ichiisa chisimbiso chepamusoro-soro chedhaka remateksi ane self-stretching mechanism inoshandisa tension kune anchorage yayo nedhaka remukati, dhaka rinobatwa sese, nokudaro richiwedzera simba rakabatana remarara uye kuputika kwepamusoro kwepolymer. Iyo nzira yekuwedzera kwekunetseka kwegoho uye kukundikana kwesimba ndeyotevera: kana simba rinoshandiswa, microcracks inononoka nekuda kwekuvandudzwa kwekugadzirisa uye elasticity, uye haigadziri kusvikira kushushikana kwakanyanya kwasvika. Uye zvakare, iyo yakarukwa yepolymer domains zvakare inotadzisa kubatanidzwa kwe microcracks mu kuburikidza-kutsemuka. Naizvozvo, iyo inorasika yepolymer poda inowedzera kutadza kushushikana uye kutadza kunetsa kwezvinhu.
Iyo firimu repolymer mudhaka repolymer-modified rine mhedzisiro yakakosha pakuoma kwedhaka. Iyo redispersible polymer poda yakagoverwa pachiratidziro inoita rimwe basa rakakosha mushure mekuparadzirwa uye kuumbwa kuita firimu, iro riri kuwedzera kunamatira kune izvo zvinosangana. Mune microstructure yenzvimbo yekubatanidza pakati pehupfu polymer-yakagadziridzwa ceramic tile bonding dhaka uye ceramic tile, iyo firimu inoumbwa nepolymer inoumba zambuko pakati peiyo vitrified ceramic tile ine yakanyanya kuderera kunyura kwemvura uye simende dhaka matrix. Nzvimbo yekubatana pakati pezvinhu zviviri zvakasiyana-siyana inzvimbo yakakosha-ine njodzi apo shrinkage mitswe inoumba uye inotungamira mukurasikirwa kwekunamatira. Nokudaro, kukwanisa kwemafirimu e latex kuporesa shrinkage cracks inoita basa rinokosha mumatairi ekunamatira.
Panguva imwecheteyo, iyo redispersible polymer poda ine ethylene ine zvakanyanya kuomerera kune organic substrates, kunyanya zvinhu zvakafanana, senge polyvinyl chloride uye polystyrene. Muenzaniso wakanaka we
Nguva yekutumira: Oct-31-2022