Electrostatic hmoov txheej tshuab ua tiav cov txheej txheem ua tau zoo los ntawm kev siab -voltage electrostatic adsorption. Nws cov txheej txheem tseem ceeb yog raws li hauv qab no: compressed cua xa cov hmoov txheej rau cov phom electrostatic tsuag, qhov chaw siab -voltage generator ntawm rab phom nozzle generates 80-}100kV electrostatic teb rau induce corona tawm, them cov hmoov atomized; cov khoom raug them yog adsorbed directionally mus rau saum npoo ntawm lub hauv av workpiece nyob rau hauv lub zog ntawm hluav taws xob teb quab yuam, tsim nqi tsub zuj zuj raws li lub txheej thickens, thiab autonomously tswj lub uniformity ntawm zaj duab xis thickness los ntawm electrostatic repulsion ntawm tib lub cim; Thaum kawg, high-temperature curing forms ib tug ntom txheej zaj duab xis, ua tiav tag nrho cov txheej txheem kev lag luam los ntawm hmoov adsorption mus rau txheej txheej.
Cov txheej txheem ua haujlwm
1. Preprocessing
Lub hom phiaj:
Tshem tawm cov khoom paug tawm ntawm qhov chaw ntawm qhov chaw ua haujlwm, ua kom xeb - pov thawj thiab adhesion - txhim kho phosphate txheej
Cov kauj ruam ntxaws:
① Degreasing: Tshem cov roj thiab roj nrog acidic degreaser (sulfuric acid / hydrochloric acid)
② Kev tshem tawm xeb: Tshem tawm cov oxide txheej los ntawm cov kua qaub los yog kev sib tsoo tshuab
③ Phosphating: Tsim cov yeeb yaj kiab grey phosphate crystalline (2-4g / m²)
④ Passivation: Sealing lub pores ntawm phosphate txheej los txhim kho corrosion kuj
2. Electrostatic txau
Lub hom phiaj:
Ua tau zoo ib yam adsorption thiab zoo rov qab ntawm hmoov txheej
Cov kauj ruam ntxaws:
① Electrostatic tiam: rab phom ntim nrog 60-100kV tsis zoo siab voltage
② Hmoov atomization: Disperse hmoov nrog compressed cua (0.4-0.6MPa)
③ Electric teb adsorption: directional deposition ntawm them hmoov rau saum npoo ntawm lub workpiece
④ Recycling thiab ua: Cyclone + lim cartridge thib ob rov siv dua (95% kev siv tus nqi)
3. Siab -kub kho
Lub hom phiaj:
Ua tiav hmoov melting, leveling, thiab crosslinking curing tshuaj tiv thaiv
Cov kauj ruam ntxaws:
① Kub nce theem: nce mus rau 185℃ntawm tus nqi ntawm 10℃/ min
② Isothermal curing: Khaws ntawm 185 ± 5℃rau 15 feeb
③ Txias theem: Ntuj txias kom qis dua 50 degree
④ Kev soj ntsuam zoo: hardness / adhesion / tshwm sim tshuaj xyuas
4. Kho kom zoo nkauj
Lub hom phiaj:
Ua tiav cov teebmeem tshwj xeeb (ntoo lis / qauv / siab gloss, thiab lwm yam)
Cov kauj ruam ntxaws:
① Glazing kho: txau cov hmoov pob tshab / UV txheej los txhim kho gloss
② Thermal hloov luam ntawv: Replicating textures los ntawm hloov zaj duab xis (150-200 degree)
③ Dej hloov luam ntawv: Impregnate thiab qhib zaj duab xis los ua 3D qauv
④ Kev kho kom zoo hauv zos: manually re-paj cov xim tshwj xeeb
Txoj Cai Ua Haujlwm
Thaum lub sij hawm ua hauj lwm, cov tshuaj tsuag rab phom los yog lub khob tshuaj tsuag ib feem ntawm electrostatic txau yog txuas nrog cov ncej tsis zoo, thaum lub workpiece txuas nrog tus ncej zoo thiab hauv av. Nyob rau hauv lub high voltage ntawm lub high -voltage electrostatic generator, ib tug electrostatic teb yog tsim nyob rau hauv lub kawg ntawm cov tshuaj tsuag phom (los yog tshuaj tsuag disc, tshuaj tsuag khob) thiab lub workpiece. Lub zog hluav taws xob tau ntsib los ntawm cov xim pleev xim yog proportional rau qhov sib npaug ntawm qhov hluav taws xob ntawm electrostatic teb thiab tus nqi ntawm cov xim pleev xim, thiab inversely proportional rau qhov kev ncua deb ntawm rab phom thiab cov workpiece. Thaum qhov hluav taws xob siab txaus, qhov chaw huab cua ionization tshwm nyob ze ntawm qhov kawg ntawm rab phom tsuag, qhov twg cov huab cua yog ionized thiab rhuab, ua rau ib tug tsaus liab halo tsim nyob ib ncig ntawm lub ntse npoo ntawm rab phom kawg los yog rab koob. Lub halo no pom meej meej hauv qhov tsaus ntuj, qhia tias muaj zog corona tawm hauv huab cua.
Cov yeeb yaj kiab- tsim cov tshuaj hauv cov txheej txheem, uas yog cov resins thiab pigments, feem ntau yog tsim los ntawm cov tshuaj lom neeg molecular siab, feem ntau dhau los ua cov khoom siv hluav taws xob. Cov kuab tshuaj-raws li txheej, ntxiv rau cov yeeb yaj kiab- tsim cov tshuaj, kuj muaj cov kuab tshuaj organic, co- cov kuab tshuaj, cov tshuaj tua kab mob, cov tshuaj electrostatic diluents, thiab lwm yam khoom ntxiv. Tsuas yog benzene, xylene, thiab hnyav roj av, feem ntau ntawm cov kuab tshuaj no -raws li cov khoom siv yog cov khoom siv polar uas tsis tshua muaj kev tiv thaiv thiab qee yam conductivity, uas tuaj yeem txhim kho qhov kev ua tau zoo ntawm cov coatings.
Cov qauv molecular ntawm dielectrics tuaj yeem muab faib ua ob hom: polar molecules thiab tsis yog -polar molecules. Dielectrics uas muaj cov polar molecules nthuav tawm cov khoom hluav taws xob thaum raug hluav taws xob sab nraud; dielectrics uas tsis yog -polar molecules pom hluav taws xob polarity nyob rau hauv kev cuam tshuam ntawm sab nraud hluav taws xob teb, yog li exerting ib affinity rau sab nraud conductive nqi, ua rau sab nrauv ntawm lub dielectric los ua lub zos them nyob rau hauv lub sab nraud hluav taws xob teb.
Cov xim yog atomized los ntawm ib lub nozzle thiab txau tawm. Cov xim atomized xim yuav raug them thaum lawv dhau los ntawm kev sib cuag nrog rab koob ntawm rab phom lub qhov ncauj lossis cov npoo ntawm cov tshuaj tsuag los yog khob. Raws li lawv dhau los ntawm cov roj ionization cheeb tsam tsim los ntawm corona tawm, lawv cov nqi them qhov ntom ntom ntxiv ntxiv. Nyob rau hauv qhov chaw electrostatic ntawm cov xim tsis zoo no, lawv txav mus rau ntawm qhov chaw ua haujlwm nrog ib qho kev taw qhia polarity thiab muab tso rau ntawm qhov chaw ua haujlwm los tsim cov txheej txheem txheej txheej.
Qhov zoo ntawm cov hmoov txheej
Kev tiv thaiv ib puag ncig zoo: tsis muaj kuab tshuaj volatilization, hmoov rov qab thiab siv tus nqi> 95%, raws li RoHS ib puag ncig cov qauv.
Kev ua tau zoo tshaj plaws: Cov txheej txheej hardness ncav cuag 2H-3H, nrog cov ntsev tsuag tshuaj tiv thaiv ntau tshaj 500 teev, thiab adhesion mus txog qib 0 (Cross Cut Method).
Kev ua haujlwm tseem ceeb: Ib zaj duab xis tsim ntawm 60-120μm, kho hauv 15-20 feeb xwb, thiab automation spraying efficiency nce 40%.
Kev kho kom zoo nkauj zoo nkauj: Customizable ntoo grain / hlau / 3D kev ntxhib los mos, nrog cov qib gloss xws li matte mus rau daim iav tiav.
Disadvantages ntawm hmoov txheej
Thickness txwv: txheej txheej txheej nrog ultra- nyias (<40μm) or ultra-thick (>200μm) cov khaubncaws sab nraud povtseg pom tsis zoo.
Kev hloov xim nyuaj: Cov xim hloov yuav tsum tau ua kom huv si ntawm cov khoom siv, ua rau 30% -50% nce nqi rau cov khoom me me ntawm ntau xim xaj.
Substrate restrictions: Applicable only to metal parts with a temperature resistance of >180 degree. Yas / ntoo yuav tsum tau kho tshwj xeeb.
Kev siv hluav taws xob siab: Kev siv hluav taws xob ntawm lub qhov cub kho kom zoo rau 65% ntawm tag nrho cov txheej txheem kev siv hluav taws xob, thiab cov pa roj carbon emissions los ntawm cov cua kub cua sov yog 20% siab dua li ntawm cov xim pleev xim.
