The thickener bakeng sa latex pente lokela ho ba le sebeletsana molemo le emulsion polymer komponeng, ho seng joalo barbotage filimi tla ba le palo e nyenyane ea reticulate, 'me e tla hlahisa ke keng ea qojoa phatsa agglomeration, e leng tla fokotsa viscosity le coarsen phatsa boholo. The thickener e tla fetola tefiso ea emulsion. Ka mohlala, cationic thickener e tla ba le phello e ke keng ea fetoloa ho emulsifier ea anionic ho senya emulsion. Thickener e loketseng bakeng sa pente ea latex e tlameha ho ba le thepa e latelang:
1. Tekanyo e tlaase le viscosity e ntle
2. Botsitso bo botle ba polokelo, ha ho phokotso ea viscosity ka lebaka la ketso ea li-enzyme, 'me ha ho phokotso ea viscosity ka lebaka la liphetoho tsa mocheso le boleng ba PH.
3, ho boloka metsi hantle, ha ho na ts'ebetso e hlakileng ea bubble
4. Ha ho na litla-morao ho thepa ea filimi e kang ho hanyetsa, gloss, matla a ho pata le ho hanyetsa metsi.
5. Ha ho na pigment flocculation
Theknoloji e teteaneng ea pente ea latex ke mohato oa bohlokoa oa 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 dispersant, thickener le pigment suspending agent ho tsitsisa viscosity ea sehlahisoa, ho fokotsa agglomeration, ho etsa filimi ea pente e boreleli le e boreleli, hape e etsa hore pente ea latex e tšoarelle nako e telele. 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 babatsehang, 'me pente ea latex e teteaneng ka HEC e na le pseudoplasticity, kahoo mekhoa ea kaho e kang ho phunya, ho roala, ho tlatsa le ho fafatsa ho na le melemo ea ho boloka mosebetsi, ho se bonolo ho hloekisa le ho senya, le ho fokotseha ho fokolang. HEC e na le nts'etsopele e ntle ea mebala. E na le miscibility e ntle haholo e nang le li-colorants le li-binders tse ngata, e etsa hore ho khonehe ho etsa lipente tsa latex tse nang le mebala e metle e tsitsitseng le botsitso. Ho feto-fetoha ha maemo ho sebelisitsoeng ha ho etsoa, ke ether e seng ea ionic. Ka hona, e ka sebelisoa ka mefuta e mengata ea pH (2 ~ 12), 'me e ka kopanngoa le likarolo tsa lipente tse tloaelehileng tsa latex tse kang li-pigment tse sebetsang, li-additives, matsoai a qhibilihang kapa li-electrolyte.
Ha ho na phello e mpe ho filimi ea ho roala. Hobane tharollo ea metsi a HEC e na le litšoaneleho tse hlakileng tsa tsitsipano ea metsi holim'a metsi, ha ho bonolo ho foam nakong ea tlhahiso le kaho, 'me tloaelo ea masoba a seretse se chesang le likoti tsa seretse se tlase.
Botsitso bo botle ba polokelo. Ts'ebetsong ea nako e telele ea polokelo, dispersibility le ho emisoa ha pigment ho ka bolokoa, 'me ha ho na bothata ba' mala o phaphametseng le ho thunya. Ha ho na le lera le lenyenyane la metsi holim'a pente le 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 fihlela ho 50-60%. Ho phaella moo, topcoat thickener ea pente e thehiloeng metsing e ka boela ea sebelisa HEC.
Hona joale, li-thickeners tse sebelisoang lipenteng tsa morao-rao tsa morao-rao li kenngoa ka ntle ho HEC le li-polymers tsa acrylic (ho akarelletsa le polyacrylates, homopolymer kapa copolymer emulsion thickeners tsa acrylic acid le methacrylic acid) tse teteaneng.
Hydroxyethyl cellulose e ka sebelisoa bakeng sa
1. Joaloka sekhomaretsi se qhalaneng kapa se sireletsang
Ka kakaretso, HEC e nang le viscosity ea 10 ho 30 mPaS e sebelisoa. HEC ea ho fihla ho 300mPa·S e ka sebelisoa hammoho le li-anionic kapa cationic surfactants, 'me phello ea ho hasana e molemo. Chelete ea litšupiso hangata ke 0.05% ea boima ba monoma.
2, joalo ka motenya
Sebelisa 15000mPa. Tekanyo ea litšupiso ea HEC e phahameng ea viscosity ka holimo ho s ke 0.5 ho 1% ea boima bohle ba ho roala ha latex, 'me boleng ba PVC bo ka fihla hoo e ka bang 60%. Penteng ea latex, ho sebelisoa HEC ea hoo e ka bang 20Pa, 'me mefuta e fapaneng 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, boemo le litšobotsi tse ling tsa pente ea latex ha li 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 kenyelletsa ka pente ea latex
HEC e entsoeng ka holim'a metsi e ka eketsoa ka phofo e omileng kapa ka mokhoa o seretse. Phofo e omileng e kenngoa ka ho toba ho pigment sila. PH ea ntlha ea tlatsetso e lokela ho ba 7 kapa tlase. Likarolo tsa alkaline tse kang dispersants li ka ekeletsoa ka mor'a horeHECe kolobisitsoe mme e qhalane ka botlalo. Slurry e entsoeng ka HEC e lokela ho kenngoa ka har'a slurry pele HEC e e-na le nako e lekaneng ea ho nosetsa le ho teteaneng ho ea boemong bo ke keng ba sebelisoa. Li-slurries tsa HEC li ka boela tsa lokisoa ka li-coalescing agents tse thehiloeng ho glycol.
4. Anti-midew ea pente ea latex
HEC e qhibilihang ka metsing ea senyeha ha e pepesetsoa hlobo e khethehileng ho cellulose le lihlahisoa tsa eona. Ho kenyelletsa li-preservatives ho penta feela ha hoa lekana, likarolo tsohle li tlameha ho se be le enzyme. Likoloi tsa tlhahiso ea pente ea latex li tlameha ho bolokoa li hloekile li bile li le makhethe, 'me lisebelisoa tsohle li tlameha ho hloekisoa khafetsa ka mouoane oa 0.5% formalin kapa 0.1% ea mercury solution.
Nako ea poso: Apr-25-2024