Li-redispersible polymer powders (RDPs) li bapala karolo ea bohlokoa liindastering tse fapaneng, ho kenyeletsoa kaho, likhomaretsi le likhoele. Li-powders tsena li sebelisoa haholo ho ntlafatsa thepa ea cementitious, ho matlafatsa ho khomarela, ho tenyetseha le ho tšoarella. Ho utloisisa ts'ebetso ea tlhahiso ea li-RDP ho bohlokoa bakeng sa bahlahisi ho netefatsa lihlahisoa tsa boleng bo holimo.
Lisebelisoa tse so fetoloe :
Tlhahiso ea li-polymer powders tse ka sebelisoang hape e qala ka ho khetha ka hloko lisebelisoa tse tala tse susumetsang thepa ea sehlahisoa sa ho qetela. Likarolo tsa mantlha li kenyelletsa li-resin tsa polymer, li-colloid tse sireletsang, li-plasticizers le li-additives tse fapaneng.
Li-polymer Resins: Ethylene-vinyl acetate (EVA), vinyl acetate-ethylene (VAE), le li-polymer tsa acrylic li sebelisoa ka tloaelo e le li-resin tse kholo tsa polymer. Li-resin tsena li fana ka ho khomarela, ho tenyetseha, le ho hanyetsa metsi ho RDPs.
Protective Colloids: Hydrophilic protective colloids tse kang polyvinyl alcohol (PVA) kapa cellulose ethers li kenngoa ho tsitsisa likaroloana tsa polymer nakong ea ho omisa le ho boloka, ho thibela ho bokellana.
Li-Plasticizers: Li-plasticizers li ntlafatsa ho tenyetseha le ho sebetsa ha RDPs. Li-plasticizers tse tloaelehileng li kenyelletsa glycol ethers kapa polyethylene glycols.
Li-additives: Li-additives tse fapaneng tse kang li-dispersants, thickeners, le li-cross-linking agents li ka kenyelletsoa ho ntlafatsa thepa e itseng e kang dispersibility, rheology, kapa matla a mochine.
Mekhoa ea ho sebetsa :
Tlhahiso ea li-polymer powders tse ka sebelisoang hape e kenyelletsa mehato e mengata e rarahaneng ea ts'ebetso, ho kenyelletsa le emulsion polymerization, ho omisa ka spray, le mekhoa ea ka mor'a phekolo.
Emulsion Polymerization:
Ts'ebetso e qala ka emulsion polymerization, moo li-monomers, metsi, li-emulsifiers, le li-initiators li kopantsoeng ka har'a mochine o tlas'a maemo a laoloang a mocheso le khatello. Li-monomers li polymerize ho etsa likaroloana tsa latex tse hasaneng metsing. Khetho ea li-monomers le maemo a karabelo li khetholla sebopeho le thepa ea polymer.
Ho tsitsisa le Coagulation:
Ka mor'a polymerization, latex e fumana botsitso ka ho eketsa li-colloid tse sireletsang le li-stabilizers. Mohato ona o thibela ho kopana ha likaroloana le ho netefatsa botsitso ba ho hasana ha latex. Li-coagulation agents li ka hlahisoa ho etsa hore ho be le coagulation e laoloang ea likaroloana tsa latex, ho etsa coagulum e tsitsitseng.
Ho omisa Spray:
The stabilised latex dispersion e ntan'o tšeloa ka har'a se omisang spray. Ka phaposing ea ho omisa, ho hasana ho entsoe ka athomo ho ba marotholi a manyane ho sebelisoa li-nozzles tse nang le khatello e phahameng. Moea o chesang o hlahisoa ka nako e le 'ngoe ho etsa mouoane oa metsi, ho siea likaroloana tse tiileng tsa polymer. Maemo a ho omisa, ho kenyelletsa mocheso oa moea o kenang, nako ea bolulo, le sekhahla sa phallo ea moea, a susumetsa sebopeho sa likaroloana le thepa ea phofo.
Kalafo ea Kamor'a
Ka mor'a ho omisoa ka spray, phofo ea polymer e hlahisoang e kena ka mor'a phekolo ho ntlafatsa ts'ebetso ea eona le botsitso ba polokelo. Ts'ebetso ena e ka kenyelletsa phetoho ea bokaholimo, granulation, le ho paka.
a. Phetoho ea Bokahohle: Lisebelisoa tse sebetsang ka holim'a metsi kapa li-cross-linking agents li ka sebelisoa ho fetola thepa ea bokaholimo ba likaroloana tsa polymer, ho ntlafatsa ho qhalana ha tsona le ho lumellana le lisebelisoa tse ling.
b. Granulation: Ho ntlafatsa ho sebetsana le dispersibility, phofo ea polymer e ka 'na ea e-ba le granulation ho hlahisa boholo ba likaroloana tse lekanang le ho fokotsa ho thehoa ha lerōle.
c. Packaging: Li-RDP tsa ho qetela li kentsoe ka har'a lijana tse thibelang mongobo ho thibela ho monya mongobo le ho boloka botsitso nakong ea polokelo le lipalangoang.
Mehato ea Taolo ea Boleng:
Taolo ea boleng e bohlokoa nakong eohle ea ts'ebetso ea tlhahiso ho netefatsa botsitso le ts'epahalo mefuteng ea li-polymer powders tse ka sebelisoang hape. Li-parameter tse 'maloa tsa bohlokoa li hlahlojoa le ho laoloa ka mekhahlelo e fapaneng:
Boleng ba Lintho tse Hlaha: Ho etsoa tlhahlobo e phethahetseng le tlhahlobo ea lisebelisoa tse tala, ho kenyeletsoa li-polymers, li-colloid le li-additives, ho netefatsa boleng ba tsona, bohloeki le ho lumellana le ts'ebeliso e reriloeng.
Tlhokomelo ea Ts'ebetso: Litekanyetso tsa bohlokoa tsa ts'ebetso joalo ka mocheso oa karabelo, khatello, litefiso tsa phepo ea monomer, le maemo a ho omisa li lula li beoa leihlo le ho lokisoa ho boloka boleng ba sehlahisoa le botsitso.
Sebopeho sa Particle: Kabo ea boholo ba likaroloana, morphology, le litšobotsi tsa bokaholimo ba phofo ea polima li hlahlojoa ho sebelisoa mekhoa e kang laser diffraction, electron microscopy, le tlhahlobo ea sebaka se ka holimo.
Teko ea Ts'ebetso: Li-polymer powders tse ka qhaloang hape li etsa liteko tse ngata tsa ts'ebetso ho lekola matla a tsona a sekhomaretsi, sebopeho sa filimi, ho hanyetsa metsi, le thepa ea mochini ho latela maemo a indasteri le litlhoko tsa bareki.
Teko ea Botsitso: Liteko tse potlakileng tsa botsofali le lithuto tsa botsitso li etsoa ho lekola botsitso ba nako e telele ba li-RDP tlasa maemo a fapaneng a polokelo, ho kenyeletsoa ho fapana ha mocheso le mongobo.
Ho hlahisa li-polymer powders tse ka sebelisoang hape ho kenyelletsa letoto le rarahaneng la mehato, ho tloha ho polymerization ea emulsion ho ea ho fafatsa ho omisa le mekhoa ea ka mor'a phekolo. Ka ho laola ka hloko thepa e tala, litekanyetso tsa ts'ebetso, le mehato ea taolo ea boleng, bahlahisi ba ka netefatsa boleng bo tsitsitseng le ts'ebetso ea li-RDP bakeng sa lits'ebetso tse fapaneng indastering ea kaho, likhomaretsi le liphahlo. Ho utloisisa mathata a ts'ebetso ea tlhahiso ho bohlokoa bakeng sa ho ntlafatsa litšobotsi tsa sehlahisoa le ho fihlela litlhoko tse ntseng li tsoela pele tsa bareki 'marakeng.
Nako ea poso: Mar-12-2024