Upfu hwepolymer hunopararira nezvimwe zvinonamatira zvisingasanganisike (zvakaita sesimende, lime yakaslaked, gypsum, ivhu, nezvimwewo) uye ma aggregates akasiyana-siyana, ma fillers nezvimwe zvinowedzera [zvakaita se hydroxypropyl methylcellulose, polysaccharide (starch ether), fiber Fiber, nezvimwewo] zvinosanganiswa mumuviri kugadzira dhaka rakasanganiswa rakaoma. Kana dhaka rakasanganiswa nemvura rowedzerwa mumvura uye rokurungwa, pasi pesimba re hydrophilic protective colloid uye mechanical shearing, zvidimbu zve latex powder zvinogona kuparadzirwa nekukurumidza mumvura, izvo zvakakwana kuti upfu hwe latex hunonyungudika hupenye zvizere. Kuumbwa kwerabha powder kwakasiyana, izvo zvine chekuita ne rheology yedhaka uye maitiro akasiyana ekuvaka: kubatana kwe latex powder nemvura kana yanyungudika, viscosity yakasiyana ye latex powder mushure mekupararira, mhedzisiro yemhepo iri mudhaka uye kupararira kwemabubbles. Kubatana pakati perabha powder nezvimwe zvinowedzera kunoita kuti latex powders dzakasiyana dzive nemabasa ekuwedzera fluidity, kuwedzera thixotropy, uye kuwedzera viscosity.
Zvinotendwa kuti nzira inoshandiswa nekugadzira upfu hwelatex hunonyungudika kuti hushande zvakanaka pakugadzira upfu hutsva ndeyekuti upfu hwelatex, kunyanya colloid inodzivirira, hune simba remvura kana hukapararira, izvo zvinowedzera kunaka kweslurry uye zvinovandudza kubatana kwekugadzira upfu.
Mushure mekunge dhaka idzva rine latex powder dispersion ragadzirwa, nekunyudzwa kwemvura nepasi pevhu, kushandiswa kwe hydration reaction, uye volatilization kuenda kumhepo, mvura inodzikira zvishoma nezvishoma, resin particles inosvika zvishoma nezvishoma, interface inosviba zvishoma nezvishoma, uye resin inobatana zvishoma nezvishoma. Pakupedzisira yakaitwa polymer kuita firimu. Maitiro ekuumbwa kwe polymer film akakamurwa kuita matanho matatu. Muchikamu chekutanga, polymer particles dzinofamba zvakasununguka muchimiro cheBrownian motion mu emulsion yekutanga. Sezvo mvura ichipera, kufamba kwe polymer particles kunowedzera kuganhurirwa, uye interfacial tension pakati pemvura nemhepo inoita kuti zvienderane zvishoma nezvishoma. Muchikamu chechipiri, apo zvidimbu zvinotanga kusangana, mvura iri mu network inopera kuburikidza ne capillary, uye high capillary tension inoshandiswa pamusoro pe zvidimbu inokonzera deformation ye latex spheres kuti iite kuti ibatane, uye mvura yasara inozadza pores, uye firimu rinoumbwa zvishoma. Danho rechitatu uye rekupedzisira rinogonesa kupararira (dzimwe nguva kunonzi kuzvinamira) kwema polymer molecules kuti agadzire firimu rinoenderera mberi zvechokwadi. Panguva yekuumbwa kwefirimu, zvidimbu zvelatex zvinofamba zvakaparadzana zvinobatana kuita chikamu chitsva chefirimu rakatetepa zvine simba guru rekudhonza. Zviri pachena kuti, kuti upfu hwepolymer hunopararira hukwanise kugadzira firimu muhari yakagadzikwazve, tembiricha yekupisa firimu shoma (MFT) inofanira kuvimbiswa kuti yakaderera pane tembiricha yekupisa yehari.
Colloids - polyvinyl alcohol inofanira kuparadzaniswa ne polymer membrane system. Izvi hazvisi dambudziko mu alkaline cement mortar system, nekuti polyvinyl alcohol ichasanganiswa ne alkali inogadzirwa ne hydration ye simende, uye kunyudzwa kwezvinhu zve quartz kuchaparadzanisa polyvinyl alcohol zvishoma nezvishoma kubva mu system, pasina hydrophilic protective colloid. , Firimu rinoumbwa nekuparadzanisa redispersible latex powder, iyo isinganyungudike mumvura, haigoni kungoshanda mumamiriro akaoma chete, asiwo mumamiriro ekunyudzwa mumvura kwenguva refu. Ehe, mune zvisiri alkaline systems, zvakaita se gypsum kana masisitimu ane fillers chete, sezvo polyvinyl alcohol ichiripo muchikamu chekupedzisira che polymer film, izvo zvinokanganisa kuramba kwemvura kwefirimu, kana masisitimu aya asingashandiswi kunyudzwa mumvura kwenguva refu, uye polymer ichiri nehunyanzvi hwayo hwemakanika, dispersible polymer powder inogona kushandiswa mune aya masisitimu.
Nekuumbwa kwekupedzisira kwefirimu repolymer, sisitimu inoumbwa nezvinhu zvisingasanganisike uye zveorganic inoumbwa mumota yakacheneswa, kureva kuti, skeleton yakaoma uye yakapfava inoumbwa nezvinhu zve hydraulic, uye upfu hwepolymer hunonyungudika hunoumbwa mugedhi uye pamusoro pakasimba. Simba rekudhonza uye kubatana kwefirimu repolymer resin inoumbwa neupfu hwelatex zvinowedzerwa. Nekuda kwekuchinjika kwepolymer, kugona kwekuchinja kwakakwira zvakanyanya kupfuura chimiro chakasimba chedombo resimende, mashandiro ekuchinja kwemota anovandudzwa, uye mhedzisiro yekupararira kwekumanikidzwa inovandudzwa zvikuru, nokudaro ichivandudza kuramba kwemupata wemota.
Nekuwedzera kwehuwandu hwepoda yepolymer inopararira, sisitimu yese inokura ichienda kupurasitiki. Kana paine huwandu hwakawanda hwe latex powder, chikamu che polymer mu mortar yakacheneswa chinodarika zvishoma nezvishoma chikamu chechigadzirwa che inorganic hydration, mortar ichachinja qualitative uye ichava elastomer, uye hydration product ye simende ichave "filler". Simba rekudhonza, elasticity, flexibility uye sealing properties yemortar yakagadziridzwa ne dispersible polymer powder zvakavandudzwa. Kubatanidzwa kwe dispersible polymer powders kunobvumira polymer film (latex film) kuumba uye kuita chikamu chemadziro e pore, nokudaro ichivhara chimiro che mortar chine maburi akawanda. Latex membrane ine nzira yekuzvitambanudza inoshandisa tension kune iyo yakanamatira nemortar. Kuburikidza nemasimba aya emukati, mortar inobatwa yese, nokudaro ichiwedzera simba re cohesive remortar. Kuvapo kwe flexible uye highly elastic polymers kunovandudza flexibility uye elasticity yemortar. Maitiro ekuwedzera kwe good stress uye failure strength ndeekuti: kana simba richishandiswa, microcracks inononoka nekuda kwekuvandudzwa kwe flexibility uye elasticity, uye haiumbike kusvika stresses dzakakwirira dzasvika. Pamusoro pezvo, interwoven polymer domains inodzivirirawo kubatanidzwa kwe Saka, upfu hwepolymer hunopararira hunowedzera kushushikana kwekukundikana uye kumanikidzwa kwekukundikana kwezvinhu.
Firimu repolymer riri mumota yakagadziriswa nepolymer rine simba guru pakuomesa simbi. Upfu hwepolymer hunokamurwazve hunoparadzirwa painterface hunoita rimwe basa guru mushure mekuparadzirwa uye kuumbwa kuita firimu, iro riri rekuwedzera kunamira kune zvinhu zviri kubata. Muchimiro chidiki chenzvimbo yekubatanidza pakati pemota yakagadziriswa neceramic tile bonding neceramic tile, firimu rinoumbwa nepolymer rinoumba zambuko pakati pe vitrified ceramic tile ine mvura shoma uye simende mortar matrix. Nzvimbo yekubatana pakati pezvinhu zviviri zvakasiyana inzvimbo ine njodzi huru uko shrinkage cracks inoumbwa uye inotungamira mukurasikirwa nekunamatira. Nokudaro, kugona kwemafirimu elatex kuporesa shrinkage cracks kunoita basa rakakosha muma tile adhesives.
Panguva imwe chete, upfu hwepolymer hunonyungudika hune ethylene hunonyanya kunamira kune zvinhu zvakasikwa, kunyanya zvinhu zvakafanana, zvakaita sepolyvinyl chloride nepolystyrene. Muenzaniso wakanaka we
Nguva yekutumira: Gumiguru-31-2022