Dispersible polymer poda uye mamwe inorganic adhesives (semende, slaked lime, gypsum, ivhu, etc.) uye akasiyana aggregates, fillers uye zvimwe zvinowedzera [zvakadai sehydroxypropyl methylcellulose, polysaccharide (starch ether), fiber Fiber, nezvimwewo] zvine muviri. yakasanganiswa kuita dhaka rakaoma-musanganiswa. 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 kwehupfu yerabha yakasiyana, iyo ine simba pane rheology yedhaka uye zvakasiyana-siyana zvekuvaka zvivakwa: kuwirirana kwelatex powder yemvura painoparadzirwa, iyo yakasiyana viscosity ye latex powder mushure mekupararira, mhedzisiro pa mhepo yemukati medhaka uye kugoverwa kwemabhuru, Kudyidzana pakati pehupfu yerabha uye zvimwe zvinowedzera zvinoita kuti latex powders yakasiyana ive nemabasa ekuwedzera fluidity, kuwedzera thixotropy, uye kuwedzera. viscosity.
Zvinowanzotendwa kuti iyo nzira iyo inodzoreredza latex poda inovandudza kushanda kwedhaka nyowani ndeyekuti iyo latex poda, kunyanya inodzivirira colloid, ine hukama hwemvura kana yakaparadzirwa, iyo inowedzera viscosity ye slurry uye inovandudza kubatana kweiyo. dhaka rekuvaka.
Mushure mekunge dhaka idzva rine latex poda dispersion yaumbwa, nekutorwa kwemvura nechepasi, 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, kana zvimedu zvinotanga kusangana, mvura iri mumambure inoputika kuburikidza necapillary, uye iyo yakakwira capillary tension inoiswa pamusoro pezvimedu zvinokonzeresa deformation ye latex spheres kuti iite fuse pamwechete, uye mvura yakasara inozadza pores, uye firimu inenge yakaumbwa. 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 mu alkaline simenti 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 richiripo muchikamu chekupedzisira chepolymer firimu, iyo inokanganisa kudzivirira kwemvura kwefirimu, kana masisitimu aya asingashandisi kwenguva yakareba mvura. kunyudzwa, uye iyo polima ichine hunhu hwayo hwemuchina, inorasika yepolymer poda inogona kushandiswa mune aya 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. Kana iri yemhando yepamusoro yelatex poda, chikamu chepolymer mudhaka yakarapirwa zvishoma nezvishoma chinodarika inorganic hydration chigadzirwa chikamu, dhaka richaita shanduko yemhando uye ive elastomer, uye iyo hydration chigadzirwa chesimende ichava "yekuzadza" ". Kusimba kwesimba, elasticity, kuchinjika uye kuvhara zvisimbiso zvedhaka rakagadziridzwa ne dispersible polymer poda zvakavandudzwa. Kubatanidzwa kwepolymer powders inorasika inobvumira firimu repolymer (latex film) kuumba uye kuumba chikamu chemadziro epore, nekudaro ichiisa chisimbiso chepamusoro-soro chimiro chedhaka. Iyo latex membrane ine yekuzvitambanudza iyo inoshandisa tension kune yayo anchorage nedhaka. Kuburikidza nemasimba emukati aya, dhaka rinobatwa sese, nokudaro richiwedzera kusimba kwakabatana kwedhaka. Kuvapo kwemapolymer anochinjika uye ane elastic zvakanyanya anovandudza kuchinjika uye elasticity yedhaka. 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