1、,Water bone paint,Table of contents,1. Necessity of water bone paint2. Water borne paint3. Water borne paint coating equipment4. Comparison of water borne paint and solvent borne paint5. Finish difference of W/B base coat of atomizer6. Water borne paint atomizer7. Color changing method of water born
2、e paint8. Water borne paint coating technology9. Machine setting,10.,Atomizer mounting position and contamination preventive device for top atomizer,11.,Maintenance of atomizer,1. Necessity of water borne paint,1.1 Comparison of V.O.C.,1. Necessity of water borne paint,Can be alleviated substantiall
3、y,Solvent borne paint,The V.O.C. ( Volatile Organic Compound ) regulation,Pollution free paint,- Powder paint- High solid paint - Water borne paint,1. Necessity of water borne paint,- Powder paint,Not containing volatile organic solvent .,- High solid paint,Lowering the viscosity of the paint resin
4、it self decreases the solvent content .,- Water borne paint,Since only a small amount of volatile organic solvent is contained .,1.1 Comparison of V.O.C.,Solvent borne paintWater borne paintHigh solid paintPowder paint,Solid content20%18%40%98%,Organic solvent80%12%60% 2%,Water 0%70% 0% 0%,The solid
5、 content and organic solvent content are compared in the metallic paint .,2. Water borne paint,2.1 Classification2.2 Features and problem 2.2.1 Slow evaporation 2.2.2 High surface tension 2.2.3 Conductive 2.2.4 Corrosive2.3 Forms of paint makers,2. Water borne paint,2.1 Classification,Water borne pa
6、int,Water - soluble type,Dispersion type,Emulsion type,Basic resin :,Polyester resin , Alkyd resin , Acrylic resin , Epoxy resin,2.1 Classification,Item,Sketch,AppearanceParticle sizeMolecular weightWorking efficiency : runningWorking efficiency : boiling , wettingDryingPaint viscositySolvent conten
7、t (%),Water soluble type,Dispersion type,Emulsion type,Clear, 0.1,Large,Non - Newtonian flow ( large ),0 - 5,2.1 Classification,Newton flow :,Viscosity is not changed if shearing force is applied .,Non Newtonian flow,Dilatency flow,When shearing force increases , viscosity also increases .,Thixotrop
8、y flow,When shearing force increases , viscosity decreases .,2.2 Features and problems,Features of water bone paint,Features of water,Problem of water,a) Slow evaporation rateb) High surface tensionc) High conductivityd) corrosive,Lead to problems in coating and equipment .,2.2 Features and problems
9、,2.2.1 Slow evaporation,The water borne paint is likely to have effects of temperature and humidity .,In Herberts paint,2.2 Features and problems,2.2.2 High surface tension,The surface tension,Water : 73dynes/cm,Water is about 2.5 times higher,Toluene : 29 dynes/cm,Wetting is likely to occur,2.2 Fea
10、tures and problems,2.2.3 Conductive,As electric characteristic of water,Purified water :,High resistance,Purified water + Impurities :,Low resistance,Water bone paint = Purified water + Impurities,2.2 Features and problems,2.2.3 Conductive,High voltage,Valve ( granding ),Water borne paint,High volta
11、ge reek,Type of insulating paint circuit ( Voltage block type ),Type of charging after atomizing paint( External electrode type ),2.2 Features and problems,2.2.4 Corrosive,Water corrodes metal to from rust,The valves and joints in the equipment,Must be made of non - corroding materials,S.U.S. ( Stai
12、nless steel ) and plastics,2.3 Forms of paint makers,Water borne paint,Technology of BASF ( Germany ),- Uses polyester resin , dispersion type,Nippon paint ( Japan ) , P.P.G. ( USA ) , Nichiyu BASF coating R&D ( Japan ) ,TBL ( Japan ),Technology of ICI ( Great Britain ),- Uses acrylic resin , emulsi
13、on type,Kansai paint ( Japan ) , DuPont ( USA ) , IDAC (Great Britain ) , AKZO ( Belgium ) ,DNT Herberts ( Japan ) , Herberts ( Germany ),3. Water borne paint coating Equipment,3.1 Classification 3.1.1 Voltage block type 3.1.2 External electrode type,3.1 Classification,High voltage,Paint circuit,Wat
14、er borne paint,High voltage reek,Type of insulating paint circuit ( Voltage block type ),Type of charging after atomizing paint( External electrode type ),3.1.1 Voltage block type,The paint circuit is insulated .,It is intended to prevent escape of current through the paint circuit .,-,-,High voltag
15、e,Paint circuit : Granding,Water borne paint,High voltage reek,High voltage,Water borne paint,Paint circuit : Insulated,3.1.1 Voltage block type,High voltage,Water borne paint,Paint circuit : Insulated,- Merits,The atomizer for solvent borne paint ( internal charging type atomizer ) can be used dire
16、ctly .,- Demerit,The working efficiency is poor when changing colors frequently , or when a large volume of paint .,3.1.1 Voltage block type,- Cylinder type,Mini voltage block,Stability of paint flow rate is poor .,Paint supply by cylinder pressure .,High voltage area,Granding area,3.1.1 Voltage blo
17、ck type,- Helper type,Paint out,Paint in,High voltage,Granding,Water borne paint,Paint tube,Rotary drum,Insulation while immersing paint tube by rotary drum .,Durability of paint tube is poor .,3.1.1 Voltage block type,- Mini-circulation type,Paint tank,Resin material paint piping,All paint circuit
18、is insulation .,3.1.2 External electrode type,High voltage,Paint circuit : Granding,Water borne paint,High voltage reek,High voltage,Paint circuit : Granding,Water borne paint,External electrode,Internal charge type,External charge type,3.1.2 External electrode type,Bell type,Bell COPES,G1 COPES,T/R
19、 COPES,COPES = Conductive Paint Electrostatic Spray system,3.1.2 External electrode type,Gun COPES,Gun type,COPES = Conductive Paint Electrostatic Spray system,4. Comparison of water borne paint and solvent borne paint,4.1 Comparison of coating line4.2 Comparison of volume shrinkage4.3 Comparison of
20、 compatibility,4.1 Comparison of coating line,The mainline of top coating for automobile,2coat 1bake system Base coat to clear coat : Wet on Wet system,Solvent borne paint,Water borne paint,Base coat,Clear coat,Final baking,Base coat,Clear coat,Final baking,Evaporating the moisture by force,4.1 Comp
21、arison of coating line,S/B paint coating line,W/B paint coating line,Base coat stage,Clear coat stage,Flush off, : Device for evaporating the moisture by force .,1 2 3,4.1 Comparison of coating line,Base coat stage,Clear coat stage,Flush off,1 : Infrared ray irradiation zone,2 : Hot wind zone ( blow
22、 out temperature : 80 to 100C ),3 : Cold wind zone ( blow out temperature : 18 to 20C ),1,2,3,W/B paint coating line,Coat film,Body surface,1 2 3,4.2 Comparison of volume shrinkage,The orientation of metal particles ( array of metal particles ),Volume shrinkage,Evaporation of thinner and hardening o
23、f the resin,Volume shrinkage is large,The metal feels ( brightness ) and smoothness,Improved,4.2 Comparison of volume shrinkage,Volume shrinkage,Large,Small,After coating,After flush off,4.2 Comparison of volume shrinkage,W/B paint,S/B paint,Paint NV : 20%,Paint NV : 20%,Wet NV : 22 to 30%,Wet NV :
24、60 to 75%,Before spray,After spray,After flush off,Water,Solid material,Solid material,Thinner,8 to 10%,40 to 55%,65 to 73%,( Film NV :95%),( Film NV :85%),10 to 15%,4.3 Comparison of compatibility,After spray,After setting,After baking,W/B paint,S/B paint,Clear coat film,Base coat film,Metal flake,
25、5. Finish difference of W/B base coat by atomizer,Particle speed,Slow,Fast,Metal flake,Paint particle,Darkness,Brightness,5. Finish difference of W/B base coat by atomizer,Particle speed,Fast,Slow,Bell type,Gun type,Me bell type,Me bell type,Me bell type,Transfer efficiency,High,Low,5. Finish differ
26、ence of W/B base coat by atomizer,IV of each stage,50,100,150,200,250,IV,Bell + Bell,Gun + Bell,Bell + Gun,Gun + Gun,1st stage,2nd stage,Total,5. Finish difference of W/B base coat by atomizer,Combination of the atomizer in the metallic base coating stage,1st stage,2nd stage,Bell type,Gun type,Bell
27、type,Me Bell type,Me Bell type,Me Bell type,6. Water borne paint atomizer,6.1 Bell type atomizer 6.1.1 Comparison between direct charge type and external charge type 6.1.2 Comparison between Bell COPES and G1 COPES6.2 Gun type atomizer,6.1 Bell type atomizer,A high voltage is applied to the bell cup
28、 ( air motor ),The paint is directly charge,The atomized particles fly to the direction of the target,The S.A. ring and probe repel as they are held the same potential,Deposit of paint mist on the S.A. ring and bell main body cover is less,Centrifugal force,Electric field,Shaping air,H.V.,Paint,Pain
29、t particle,H.V. area,Probe,S.A. ring,Bell,6.1 Bell type atomizer,Paint particles atomized from the bell cup,Charged by the electrode around bell,The paint particles atomized from the bell cup are charged in the air,The directivity of the paint particles varies with the state of particle and flow of
30、air until charged,Centrifugal force,Electro field,Shaping air,After charged paint particle,Paint particle,H.V.,Paint,Elect rode,Charging area,Bell COPES,6.1 Bell type atomizer,Bell COPES,Contamination caused, : Electrical action, : Mechanical action,Contamination is caused if paint particles do not
31、fly in the electrode direction .,6.1 Bell type atomizer,Bell COPES,1 : Electro action,The electric action means the absorption energy by static electricity,Until being charged , the paint particles are free from voltage,The resin of S.A. ring and body cover are always charged,Hence have the power of
32、 absorbing the voltage-free paint particles,If directivity is lost due to some effect until the paint particles are charged,They are easily adhered to the atomizer cover and S.A. ring,6.1 Bell type atomizer,Bell COPES,2 : Mechanical action,The mechanical action is disturbance of directivity of paint
33、 particles due to airflow around the paint particles .,Primary factor,- S.A. pressure - Reciprocating- Booth air flow- Air bloweretc.,6.1 Bell type atomizer,Bell COPES,1 and 2,It is necessary to consider possibility of occurrence when cleaning or feeding next color , as well as during coating .,6.1
34、Bell type atomizer,Bell COPES,Protect of contamination,spray conditions,- Bell rotation speed- S.A. pressure- High voltage- Head target distance- Air blower pressure- Purge air pressure,Booth conditions,- Air flow speed- Direction of air,Machine conditions,- Reciprocating speed- Bell pitch- Mounting
35、 position of atomizer,Flushing conditions,- Bell rotation speed- S.A. pressure- High voltage- Air blower pressure- Purge air pressure- Thinner flow rate- Next color paint flow rate,6.1.2 Comparison between Bell COPES and G1 COPES,Basically , the G1 COPES is same as the Bell COPES .,G1 COPES also fun
36、ctions same as the metallic bell .,-,-,Bell COPES,G1 COPES Bell,Base coat stage,1st stage,2nd stage,6.1.2 Comparison between Bell COPES and G1 COPES,S.A. ring typeDiameter of bell cupBuilt in valveAir blowerTurbine air exhausting methodPurge air,Slit type50mmTrigger , dumpExternalFrontNone,Hole type
37、 ( Type A)70mm with B.O.C.Trigger , dump ,N.F. thinnerInternalRear or frontProvided,Bell COPES,G1 COPES,B.O.C. = Bell Outside Cleaning,N.F. thinner = Nose Flush thinner ( Only bell cup cleaning circuit ),6.1.2 Comparison between Bell COPES and G1 COPES,- Comparison of bell cup,Bell COPES,Bell cup di
38、ameter,50mm,G1 COPES,70mm,B.O.C. function,None,Provided,Shape of bell cup,High atomizationPattern width,Cleaning for bell cup outside,Bell cup outside,6.1.2 Comparison between Bell COPES and G1 COPES,- Comparison of shaping air ( S.A. ) ring,Bell COPES,G1 COPES,S.A. ring type,Slit type,Hole type,Mat
39、erial,All P.E.T material,Inner metalOuter P.E.T,Purge air,None,Provided,High particle speed,Preventing contamination of rim backside of the bell cup,Prevention of contamination of the S.A. ring,6.1.2 Comparison between Bell COPES and G1 COPES,Preventing contamination of S.A. ring,Keeping minus ion z
40、one also in the periphery of the S.A. ring,Bell cup,Electrode,S.A. ring,Bell cup,Electrode,7. Color change method of water borne paint,7.1 Color change method 7.1.1 Cleaning cycle 7.1.2 Color change method 7.1.3 Combination of thinner7.2 N.F. thinner ( nose flush thinner ) 7.2.1 Setting method 7.2.2
41、 Caution on parameter,7.1 Color change method,7.1.1 Cleaning cycle,The water borne paint,The emulsion core is broken by mechanical force,Adhered to the hose wall,Adverse effect are caused on the cleaning performance,Emulsion core,Water bone resin,Solvent borne resin,Broken,Paint tube wall,Solvent bo
42、rne resin,7.1 Color change method,7.1.1 Cleaning cycle,Broken,Solvent borne paint,Water borne paint,Flushing air,Flushing thinner,Emulsion core,Water bone resin,Solvent borne resin,Flushing air,Flushing thinner,Flushing air is fast speed,7.1 Color change method,7.1.1 Cleaning cycle,Broken,Water born
43、e paint,Flushing air,Flushing thinner,1st Th.,2nd Th.,3rd Th.,The emulsion core may be broken depending on the type of the thinner,1st thinner,Water,2nd thinner,Hydrophilic thinner,3rd thinner,Next color = Solvent borne paint : Hydrophobic Th.,Next color = Water borne paint : Water,Dissolving power
44、for W/B and S/B,7.1 Color change method,7.1.2 Color change method,When combination the water borne and solvent born paint,Three kinds of thinner are used at the present,Before supply of next color,The paint circuit must be rinsed by using thinner having an affinity for next color,In order to prevent
45、 aggregation of paint,WaterHydrophilic Th.Hydrophobic Th.,7.1 Color change method,7.1.2 Color change method,Emulsion core,Water bone resin,Solvent borne resin,Emulsion coreWater borne resinSolvent borne resin,Water,Hydrophilic,Hydrophobic,Kind of thinner,Water,Hydrophilic Th.,Hydrophobic Th.,7.1 Col
46、or change method,7.1.3 Combination of thinner,Case of water bone paint to water borne paint,Water borne paint coating,Water borne paint coating,Color change,Hydrophilic Th.,Water,Next color feed,Water,Rinsing,7.1 Color change method,7.1.3 Combination of thinner,Case of water bone paint to solvent borne paint,Water borne paint coating,Solvent borne paint coating,Color change,Hydrophilic Th.,Water,Next color feed,Hydrophobic Th.,
