Mechanism ea Redispersible Emulsion Powder ka Dry Mix Mortar

Redispersible latex powder le tse ling tse inorganic adhesives (jwalo ka samente, slaked lime, gypsum, letsopa, joalo-joalo) le aggregates tse fapa-fapaneng, li-filler le li-additives tse ling [tse kang hydroxypropyl methylcellulose, polysaccharide (starch ether), fiber Fiber, joalo-joalo] li entsoe. seretseng se kopantseng se ommeng ka ho kopanya mmele.Ha seretse sa phofo se omeletseng se kenngoa metsing 'me se tsosoa, tlas'a ketso ea hydrophilic protective colloid le mechanical shear force, likaroloana tsa phofo tsa latex li ka qhalakanngoa ka potlako ka metsing, e leng ho lekaneng ho etsa ka ho feletseng phofo ea latex e ka sebelisoang hape. filimi.Sebopeho sa phofo ea rabara se na le liphello tse fapaneng ho thepa ea rheological ea seretse le thepa e sa tšoaneng ea kaho: kamano ea phofo ea latex le metsi ha e qhalakanngoa hape, li-viscosities tse fapaneng tsa phofo ea latex ka mor'a ho hasana, phello ea moea. ea seretse le ho ajoa ha li-bubble tsa moea, Tšebelisano pakeng tsa phofo ea rabara le li-additives tse ling li etsa hore phofo e fapaneng ea latex e be le liphello tsa ho eketseha ha metsi, ho eketsa thixotropy, le ho eketseha ha viscosity.

Ka kakaretso ho lumeloa hore mochine oa "latex powder" oa "redispersible latex powder" ho ntlafatsa ts'ebetso ea seretse se secha ke: kamano ea phofo ea latex, haholo-holo colloid e sireletsang, ho noa metsi ha e qhalakanngoa, e eketsa viscosity ea slurry, 'me e ntlafatsa momahano. seretse sa kaho.

Kamora hore seretse se sa tsoa tsoakoa se nang le phallo ea phofo ea latex se thehoe, ka ho monya metsi ka holim'a botlaaseng, ts'ebeliso ea hydration reaction, le volatilization moeeng, metsi a tla fokotseha butle-butle, likaroloana tsa resin li tla atamela butle, sebopeho. butle-butle e tla fifala, 'me li-resin li tla kopana butle-butle.qetellong e entsoe ka polymer ho ba filimi.Mokhoa oa ho etsa filimi ea polymer e arotsoe ka mekhahlelo e meraro.Mokhahlelong oa pele, likaroloana tsa polymer li tsamaea ka bolokolohi ka mokhoa oa ho sisinyeha ha Brownian ho emulsion ea pele.Ha metsi a fetoha mouoane, ho tsamaea ha likaroloana ka tlhaho ho fokotsehile le ho feta, 'me tsitsipano ea sefahleho pakeng tsa metsi le moea e li qobella ho ikamahanya butle-butle.Mokhahlelong oa bobeli, ha likaroloana li kopana, metsi a marang-rang a fetoha mouoane ka li-tubes tsa capillary, 'me khatello e phahameng ea capillary e sebelisoang holim'a likaroloana e etsa hore ho senyeha ha likaroloana tsa latex ho li kopanya hammoho,' metsi a setseng a tlatsa li-pores, 'me filimi e batla e thehoa.Mokhahlelo oa boraro, oa ho qetela o lumella ho hasana (eo ka linako tse ling ho bitsoang "self-adhesion" ea limolek'hule tsa polymer ho etsa filimi ea 'nete e tsoelang pele.Nakong ea ho etsoa ha filimi, likaroloana tse ka thōko tsa latex tsa selefouno li kopana ho ba karolo e ncha ea filimi e nang le khatello e matla ea khatello.Ho hlakile hore, e le ho etsa hore phofo ea polymer e khonehe ho etsa filimi ka har'a seretse se thata, hoa hlokahala ho etsa bonnete ba hore mocheso o fokolang oa ho etsa filimi (MFT) o tlase ho feta mocheso o folisang oa seretse.

Colloids - joala ea polyvinyl e tlameha ho aroloa ho tsamaiso ea filimi ea polymer.Sena ha se bothata tsamaisong ea seretse sa samente ea alkaline, hobane joala ba polyvinyl bo tla silafatsoa ke alkali e hlahisoang ke samente hydration, 'me adsorption ea thepa ea quartz e tla arola joala ea polyvinyl butle-butle ho tloha tsamaisong, ntle le hydrophilic protective colloid. , Filimi e entsoeng ke ho qhalakanngoa ha nako e le 'ngoe ea phofo ea latex e redispersible, eo ka boeona e ke keng ea qhibiliha ka metsing, e ke ke ea sebetsa feela maemong a omileng, empa hape le ka nako e telele ea ho qoelisoa metsing.Ha e le hantle, lits'ebetsong tse seng tsa alkaline, tse kang li-gypsum kapa li-filler-feela, hobane joala ba polyvinyl bo ntse bo le teng ka mokhoa o itseng filiming ea ho qetela ea polymer, e amang ho hanyetsa metsi ha filimi, ha mekhoa ena e sa sebelisoe nako e telele ea metsi. ho qoelisoa, 'me polymer e ntse e e-na le thepa ea eona e ikhethang ea mochine,' me phofo ea polymer e ka sebelisoang e ntse e ka sebelisoa lits'ebetsong tsena.

Ka sebopeho sa ho qetela sa filimi ea polymer, tsamaiso e entsoeng ka li-inorganic le organic binder structures e thehoa ka har'a seretse se phekotsoeng, ke hore, masapo a brittle le a thata a entsoeng ka thepa ea hydraulic, 'me latex powder e qhalakanngoa e etsa filimi pakeng tsa lekhalo le bokahodimo bo tiileng.netweke e tenyetsehang.Matla a tsitsitseng le momahano oa filimi ea resin ea polymer e entsoeng ke phofo ea latex e ntlafatsoa.Ka lebaka la ho feto-fetoha ha polymer, bokhoni ba deformation bo phahame haholo ho feta ba sebopeho se thata sa lejoe la samente, ts'ebetso ea deformation ea seretse e ntlafatsoa, ​​​​'me phello ea khatello ea kelello e ntlafala haholo, kahoo e ntlafatsa ho hanyetsa ha seretse. .

Ka keketseho ea litaba tsa phofo ea latex e ka sebelisoang hape, sistimi eohle e tsoela pele ho ea ho polasetiki.Tabeng ea boleng bo phahameng ba latex powder, karolo ea polymer ka seretse se phekotsoeng butle-butle e feta karolo ea sehlahisoa sa inorganic hydration, 'me seretse se tla fetoha phetoho ea boleng le ho ba elastomer, ha sehlahisoa sa hydration sa samente se fetoha "filler".“.Matla a tsitsitseng, elasticity, ho feto-fetoha ha maemo le ho tiiseha ha seretse se fetotsoeng ke redispersible latex powder kaofela li ntlafatsoa.Ho kopanngoa ha phofo ea latex e ka sebelisoang hape ho lumella filimi ea polymer (filimi ea latex) hore e thehe le ho etsa karolo ea marako a pore, kahoo e tiisa sebopeho se nang le masoba a mangata a seretse.Lera la latex le na le mokhoa oa ho ikotlolla o fanang ka tsitsipano moo le khomaretsoeng seretseng.Ka matla ana a ka hare, seretse se bolokiloe ka kakaretso, kahoo se eketsa matla a momahano a seretse.Ho ba teng ha li-polymers tse feto-fetohang haholo le tse phahameng haholo li ntlafatsa ho tenyetseha le ho tsitsisa ha seretse.

Mokhoa oa ho eketseha ha khatello ea lihlahisoa le matla a ho hlōleha ke ka tsela e latelang: ha ho sebelisoa matla, li-microcracks li lieha ho fihlela likhatello tse phahameng li fihla ka lebaka la ho ntlafatsa ho feto-fetoha ha maemo le elasticity.Ntle le moo, libaka tsa polymer tse lohiloeng li boetse li sitisa ho kopana ha li-microcracks ho kena mapatsong a phunyeletsang.Ka hona, phofo ea polymer e ka sebelisoang hape e ntlafatsa khatello ea maikutlo le ho se atlehe ha thepa.

Filimi ea polymer ka seretse se fetotsoeng sa polymer e na le phello ea bohlokoa haholo ho seretse se thata.The redispersible latex phofo ajoa ka segokanyimmediamentsi sa sebolokigolo phetha karolo e 'ngoe ea bohlokoa ka mor'a hore qhalakantsoeng le filimi-forming, e leng ho eketsa adhesion ho ile a ikopanya le thepa.Ka microstructure ea phofo polymer e fetotsoeng tile bonding seretse le sebopeho sa lithaele, filimi e entsoeng ke polymer e etsa borokho pakeng tsa lithaele tse nang le vitrified tse nang le metsi a tlaase haholo le matrix a seretse sa samente.Sebaka sa ho kopana pakeng tsa lisebelisoa tse peli tse sa tšoaneng ke sebaka se kotsi ka ho khetheha bakeng sa mapetsong a shrinkage ho theha le ho lebisa tahlehelong ea momahano.Ka hona, bokhoni ba lifilimi tsa latex ho folisa mapetsong a shrinkage ke ba bohlokoa haholo bakeng sa likhomaretsi tsa lithaele.

Ka nako e ts'oanang, phofo ea latex e ka sebelisoang hape e nang le ethylene e na le sekhomaretsi se ikhethang ho li-substrates tsa manyolo, haholo lisebelisoa tse ts'oanang, joalo ka polyvinyl chloride le polystyrene.Mohlala o motle ke ha ho tluoa tabeng ea limaske.