Li-thickeners bakeng sa lipente tsa latex li tlameha ho lumellana hantle le metsoako ea polymer ea latex, ho seng joalo ho tla ba le palo e nyenyane ea sebopeho ka filimi ea ho roala, 'me ho tla etsahala hore ho be le likaroloana tse ke keng tsa fetoloa, tse hlahisang ho fokotseha ha viscosity le boholo ba likaroloana tse nyenyane.Li-thickeners li tla fetola tefiso ea emulsion.Mohlala, li-thickeners tsa cationic li tla ba le phello e ke keng ea fetoloa ho li-anionic emulsifiers le ho baka demulsification.Setsi se loketseng sa pente ea latex se tlameha ho ba le lintho tse latelang:
1. Tekanyo e tlaase le viscosity e ntle
2. Ho boloka botsitso bo botle, ho ke ke ha fokotsa viscosity ka lebaka la ketso ea li-enzyme, 'me e ke ke ea fokotsa viscosity ka lebaka la liphetoho tsa mocheso le pH boleng.
3. Ho boloka metsi hantle, ha ho na li-bubble tsa moea tse hlakileng
4. Ha ho na litla-morao ho thepa ea filimi ea pente e kang ho hanyetsa, ho penya, matla a ho pata le ho hanyetsa metsi.
5. Ha ho flocculation ea li-pigments
Theknoloji e teteaneng ea pente ea latex ke tekanyo ea bohlokoa ea ho ntlafatsa boleng ba latex le ho fokotsa litšenyehelo.Hydroxyethyl cellulose ke setenya se loketseng, se nang le litlamorao tse ngata ho ho tiea, ho tsitsisa le tokiso ea rheological ea pente ea latex.
Ts'ebetsong ea tlhahiso ea pente ea latex, hydroxyethyl cellulose (HEC) e sebelisoa e le sesebelisoa se emisang, se teteaneng le sa pigment ho tsitsisa viscosity ea sehlahisoa, ho fokotsa agglomeration, ho etsa hore filimi ea pente e boreleli ebile e boreleli, 'me e etsa hore pente ea latex e tšoarelle haholoanyane. .Rheology e ntle, e khona ho mamella matla a phahameng a ho kuta, 'me e ka fana ka boemo bo botle, ho hanyetsa mongoao le ho tšoana ha pigment.Ka nako e ts'oanang, HEC e na le ts'ebetso e ntle haholo, 'me pente ea latex e teteaneng ka HEC e na le pseudoplasticity, kahoo ho brushing, rolling, ho tlatsa, ho fafatsa le mekhoa e meng ea kaho ho na le melemo ea ho pholosa mosebetsi, ha ho bonolo ho e hlakola, ho sag le ho fokotseha ho fokolang.HEC e na le nts'etsopele e ntle ea mebala.E na le miscibility e babatsehang bakeng sa mebala e mengata le li-binders, tse etsang hore pente ea latex e be le mebala e metle e tsitsitseng le botsitso.Ho feto-fetoha ha maemo bakeng sa ts'ebeliso ho litlhophiso, ke ether e seng ea ionic.Ka hona, e ka sebelisoa ka mefuta e mengata ea pH (2 ~ 12), 'me e ka tsoakoa le likaroloana ka kakaretso pente ea latex e kang li-pigment tse sebetsang, li-additives, matsoai a qhibilihang kapa li-electrolyte.
Ha ho phello e mpe ho filimi ea ho roala, hobane tharollo ea metsi a HEC e na le litšobotsi tse hlakileng tsa tsitsipano ea metsi holim'a metsi, ha ho bonolo ho foam nakong ea tlhahiso le kaho, 'me tšekamelo ea likoti tsa seretse se chesang le li-pinholes li fokotseha.
Botsitso bo botle ba polokelo.Nakong ea polokelo ea nako e telele, dispersibility le ho emisoa ha pigment ho ka bolokoa, 'me ha ho na bothata ba' mala o phaphametseng le ho thunya.Ho na le lera le lenyenyane la metsi holim'a pente, 'me ha mocheso oa polokelo o fetoha haholo.Viscosity ea eona e ntse e batla e tsitsitse.
HEC e ka eketsa boleng ba PVC (pigment volume concentration) e tiileng ho fihla ho 50-60%.Ntle le moo, sekoaelo sa bokaholimo ba pente e thehiloeng metsing le sona se ka sebelisa HEC.
Hona joale, li-thickeners tse sebelisoang malapeng le lipente tsa latex tse phahameng li kenngoa ka ntle ho HEC le acrylic polymer (ho akarelletsa le polyacrylate, homopolymer kapa copolymer emulsion thickeners ea acrylic acid le methacrylic acid) thickeners.
Hydroxyethyl cellulose e ka sebelisoa bakeng sa
1. Joaloka sekhomaretsi se qhalaneng kapa se sireletsang
Ka kakaretso, HEC e nang le viscosity ea 10-30mPaS e sebelisoa.HEC e ka sebelisoang ho fihlela ho 300mPa·S e tla ba le phello e ntle ea ho hasana haeba e sebelisoa hammoho le li-anionic kapa cationic surfactants.Tekanyetso ea litšupiso hangata ke 0.05% ea boima ba monoma.
2. E le motenya
Sebelisa 15000mPa.Tekanyo ea litšupiso ea HEC e phahameng ea viscosity ka holimo ho s ke 0.5-1% ea boima bohle ba pente ea latex, 'me boleng ba PVC bo ka fihla hoo e ka bang 60%.Sebelisa HEC ea hoo e ka bang 20Pa,s ka pente ea latex, 'me ts'ebetso ea pente ea latex ke eona e ntle ka ho fetisisa.Litsenyehelo tsa ho sebelisa HEC ka holimo ho 30O00Pa.s li tlase.Leha ho le joalo, boleng ba pente ea latex ha bo ntle.Ho ea ka pono ea litlhoko tsa boleng le ho fokotsa litšenyehelo, ho molemo ho sebelisa HEC e bohareng le e phahameng ea viscosity hammoho.
3. Mokhoa oa ho kopanya ka pente ea latex
HEC e phekotsoeng ka holim'a metsi e ka eketsoa ka phofo e omileng kapa foromo ea peista.Phofo e omeletseng e kenngoa ka ho toba ho pigment grind.PH sebakeng sa phepelo e lokela ho ba 7 kapa tlase.Likarolo tsa alkaline tse kang Yanbian dispersant li ka eketsoa ka mor'a hore HEC e kolobisoe 'me e qhalane ka ho feletseng.Li-slurries tse entsoeng ka HEC li lokela ho kenngoa ka har'a slurry pele HEC e e-na le nako e lekaneng ea ho nosetsa le ho lumella ho teteaneng ho fihlela boemong bo ke keng ba sebelisoa.Hape hoa khoneha ho lokisa makhasi a HEC ka li-ethylene glycol coalescing agents.
4. Anti-mold ea pente ea latex
HEC e qhibilihang ka metsi e tla senyeha ha e kopana le hlobo e nang le liphello tse khethehileng ho cellulose le lihlahisoa tsa eona.Ha hoa lekana ho kenya li-preservatives ho pente feela, likarolo tsohle li tlameha ho se be le enzyme.Koloi ea tlhahiso ea pente ea latex e tlameha ho bolokoa e hloekile, 'me lisebelisoa tsohle li tlameha ho hloekisoa khafetsa ka mouoane oa 0.5% formalin kapa O.1% mercury solution.
Nako ea poso: Dec-26-2022