painting and coating of plastics jaime cypher ryan seyler daniel wilson
TRANSCRIPT
PAINTING AND COATING PAINTING AND COATING OF PLASTICSOF PLASTICS
JAIME CYPHER JAIME CYPHER
RYAN SEYLERRYAN SEYLER
DANIEL WILSONDANIEL WILSON
IntroductionIntroduction
Purpose of coating and paintingPurpose of coating and painting• DecorativeDecorative
• For consumersFor consumers
• ProtectionProtection• From unwanted environmental effectsFrom unwanted environmental effects• Helps overall performanceHelps overall performance
Methods: Painting, Powder CoatingMethods: Painting, Powder Coating
Introduction Introduction
Background on PaintingBackground on Painting• More aesthetically pleasingMore aesthetically pleasing• Most common method of coating Most common method of coating • Paint applied to surface as liquidsPaint applied to surface as liquids• Higher surface energy = BetterHigher surface energy = Better
Introduction Introduction
Background on Powder CoatingBackground on Powder Coating• Used on metals, ceramics, & plasticUsed on metals, ceramics, & plastic• Powdered solid coating appliedPowdered solid coating applied
Preparation of PlasticPreparation of Plastic
Prevent foreign substancesPrevent foreign substances• Detergent cleaningDetergent cleaning
• Salts and OilsSalts and Oils
• GlovesGloves• Fingerprint soilsFingerprint soils
• Destaticizing air blow-offDestaticizing air blow-off• Operate in “clean room”Operate in “clean room”
Paint AdhesionPaint Adhesion
Overcoming surface smoothnessOvercoming surface smoothness• Micro-etch with chemical agentMicro-etch with chemical agent
• Avoid over and under etchingAvoid over and under etching• Solvent choice is criticalSolvent choice is critical
• De-glazing with abrasive mediaDe-glazing with abrasive media• Areas of frictional heatingAreas of frictional heating• Cross-linked skin formsCross-linked skin forms
Paint Adhesion Paint Adhesion
• Oxidative surface treatingOxidative surface treating• For non-polar plastic surfacesFor non-polar plastic surfaces• Polarity from chemical reactionPolarity from chemical reaction• Polypropylene and PolyethylenePolypropylene and Polyethylene• Open flame exposureOpen flame exposure• Photosensitizers and UV lightPhotosensitizers and UV light
PaintingPainting
Advantages of PaintingAdvantages of Painting• Protective coatingProtective coating• Richer color than internal colorantsRicher color than internal colorants• Thin coatings possibleThin coatings possible• Same color parts in assemblySame color parts in assembly
PaintingPainting
Disadvantages of PaintingDisadvantages of Painting• Poor adhesion to certain plasticsPoor adhesion to certain plastics• Air pollutionAir pollution
• Disposal of wasteDisposal of waste
• Paintability varies among plasticsPaintability varies among plastics
Types of Painting Types of Painting ProcessesProcesses
SpraySpray Silk-ScreeningSilk-Screening Dip-CoatingDip-Coating Rolling Rolling BrushingBrushing WipingWiping
SpraySpray
Most common and versatile methodMost common and versatile method Easily automatedEasily automated Air pressure & liquid stream mixedAir pressure & liquid stream mixed Distance from part & speed Distance from part & speed
importantimportant Overspray unimportant, booths usedOverspray unimportant, booths used
SpraySpray
AdvantagesAdvantages• Excellent surface Excellent surface
qualityquality• Uniform Uniform
thicknessthickness• Few runsFew runs• Few Few
imperfectionsimperfections
Silk-ScreeningSilk-Screening
Series of screensSeries of screens preparedprepared• Multi-color imagesMulti-color images
•One screen per colorOne screen per color• One screen per portionOne screen per portion
Drying time necessaryDrying time necessary
Silk-ScreeningSilk-Screening
AdvantagesAdvantages• Flat & cylindrical partsFlat & cylindrical parts• High volume productionHigh volume production
DisadvantagesDisadvantages• Adhesion problemsAdhesion problems
• Due to bad preparationDue to bad preparation• Presence of mold releasePresence of mold release
OthersOthers
Dip-CoatingDip-Coating• Immersion in paint & rotatingImmersion in paint & rotating
Brushing, Rolling, & WipingBrushing, Rolling, & Wiping• Used less frequentlyUsed less frequently• AdvantagesAdvantages
• Special effects Special effects • Small lotsSmall lots
Powder CoatingPowder Coating
ProcessProcess• Immersion in plastic particles or sprayedImmersion in plastic particles or sprayed• Baked at high temperaturesBaked at high temperatures• Caution of degradation from fusionCaution of degradation from fusion
Powder CoatingPowder Coating
TypesTypes• EpoxyEpoxy• HybridHybrid• Aromatic Aromatic
UrethaneUrethane• TGIC PolyesterTGIC Polyester
Powder CoatingPowder Coating
Advantages of Powder CoatingAdvantages of Powder Coating• Many types of finishesMany types of finishes• Better performanceBetter performance• Better for environmentBetter for environment• Low costLow cost
Powder CoatingPowder Coating
Disadvantages of Powder CoatingDisadvantages of Powder Coating• Degradation or softening possibleDegradation or softening possible
• Causes part deformationCauses part deformation
• Long color change timeLong color change time
New TechnologyNew Technology
In-Mold PaintingIn-Mold Painting• Automotive usesAutomotive uses
• Insert-molding techniqueInsert-molding technique
• Eliminates paint-facility expensesEliminates paint-facility expenses• Better design flexibilityBetter design flexibility• Recycling easierRecycling easier
New TechnologyNew Technology
2K Polyurethane Coating2K Polyurethane Coating• Automotive usesAutomotive uses• Excellent appearanceExcellent appearance• Excellent performanceExcellent performance
• Curing at low temperaturesCuring at low temperatures
• Wide variety of plasticsWide variety of plastics
MaterialsMaterials
Not to be consideredNot to be considered• PE, PP, and low polarity plasticsPE, PP, and low polarity plastics
• Low surface energyLow surface energy
Cautionary materialsCautionary materials• PC & PS PC & PS
• Exposure to sensitive solventsExposure to sensitive solvents
Design RequirementsDesign Requirements
Material SelectionMaterial Selection Adding raised part detailsAdding raised part details
• Ink applied using rollerInk applied using roller Flat surfaces if possibleFlat surfaces if possible
• Uniform thicknessUniform thickness• CheaperCheaper
ExamplesExamples
PaintingPainting
ExamplesExamples
Powder CoatingPowder Coating
ConclusionConclusion
Coating & Painting valuableCoating & Painting valuable• DecorativeDecorative• Protective Protective
Preparation is crucialPreparation is crucial Many different processes Many different processes Becoming more popular todayBecoming more popular today