Special Effect Pigments for Coating

OUTLINE 1. 2. 3. 4. Introduction Raw Materials Various Applications Tips to Use Pearlescent Pigments 1. 2. 3. 4.

Paint category By Resin: By Form: By Components: Epoxy coatings, polyester paint, Acrylic paint, fluorocarbon paint By Form: Solvents, emulsions, powders By Components: Single-component coating, two-component coating By Cross linking temperature: Low temperature paint, high temperature paint

Non-volatilizale film Paint composition Paint Resin Non-volatilizale film Solvent Dissolve Resin Disperse Resin Pigments Effect Additives Improve Effect

Pre-wetting Pre-wetting the mica pigment with solvent (slurry) or binder components is usually an advantage for easier dispersion Pearlescent pigments should (if possible) be added to the paint system as the final component.

Stirrer Type Mica pigments are easy to disperse – normal stirring is sufficient Never use three-roll mills or bead mills (platelet destruction) Stirring equipment: Blade-type (propeller or butterfly type) Stirrers: U-shaped stirrers Disc-shape (Dissolver-type) stirrers (special restrictions)

Sedimentation Mica/Metal oxide pigments have a density of approx. 3g/cm3 so they have a tendency to settle. Easy re-dispersion, by simple stirring, is most effective to prevent the formation of a hard layer/cake Solutions Continual movement of the paint system during processing Use of suitable additives for easy re-dispersion, which have do not have an negative effect on the pearl lustre effect.

Pigments for Liquid Paints

Applying method Dipping Brush Spray Roller Electrophoresis Curtain coating

Coating Market Applications: Automotive OEM Coatings Automotive Refinish Coatings Powder Coatings Plastic Coatings Industrial Coating Coil Coating Dispersion Paint Leather Coatings Wood Coatings Artist Paint

Powder Coating Ecological Economical No solvents necessary Recovery of overspray possible No residue with an efficiency of almost 100% Cost effective one-coat system thick film application in one step (80μm) Usually no clear coat necessary Ecological No solvents necessary

Powder Coating Application examples

Powder Coating Process Fundamental requirement: Powder has to be provided with electric charge. The process: Electrostatic attraction between the powder and the grounded (conductive) object Melting and film formation followed by curing in an oven

Powder Coating: Addition of Pearlescent pigments Due to their physical properties in respect of reflection and interaction with incident light and depending on their particle size they offer a wide range of colouristic possibilities creating silky pearl appearance, polychromatic colour design and functional protection benefits to powder coated surfaces. Dry-Blending Method Mixing Pearlescent Pigments into the ready-made powder can be realized despite several disadvantages. Bonding Process Pearlescent Pigments are mixed with the ready-made powder and fixed at the surface of the powder particles.

Automotive OEM Coating Pearlescent pigments were first used in OEM automotive paint in the early 1980’s. These pigments add to the chromatic effect of organic pigments and contribute to the polychromatic effect desired in these coatings. Pearl pigments have been stabilized by various methods to give the durability required for automotive end users. Excellent weather Resistant characteristic is extremely important for most producers requiring minimum 1000 hours QUV test, assuring no change in color or gloss. Pearlescent Metallic effect is the first choice of a majority of automotive buyers.

Automotive Paint Clear coat Base coat Primer Electro coat Substrate Since pearlescent pigments (coated mica types) are transparent in nature, they do not “gray out” or “muddy-up” the expensive transparent organic coating colorants used in automotive coatings. Clear coat Base coat Primer Electro coat Substrate

Automotive Refinish Coating Automotive refinish paint system posts high requirements on the quality and batch consistency of the pigments, even subtle colour differences might lead to scrapped refinish paint. Weather performance and compatibility also play an important role in the automotive refinish.

Plastic Coating There are specific requirements for coating systems and effect coatings in colour definition. With Pearlescent pigments plastic coatings’ manufacturers are able to satisfy the market’s craving for the latest trends and stylings in consumer electronics, home appliances, and automotive interiors. In addition to their outstanding appearance, the effect pigments often have to satisfy other demands related to functionality, such as especially high chemical resistance and electrical conductivity.

Plastic Coating Specially surface treated pigments are available for products destined to be used outdoors. These types are also suitable for items that are used indoors but are exposed to increased humidity levels or mechanical stress, such as furniture or electrical appliances normally located in kitchens and bathrooms. Optical aging is common in plastic applications and this requires effect coatings to have good weather-resistance.

Industrial Coatings Industrial coating applications as well for bicycles, motorcycles and scooters special effect pigments are often used Weather-resistance and environmental protection are the important factors for industrial coatings.

Coil Coating Coil Coating is an innovative concept for architectural and household applications. Pritty Pearlescent pigment not only provides special effects to coil coating but when used in architectural applications gives an illusory and distinct appearance from some distance away. The most important properties of coil coatings are, better flexibility of a coating film and weather resistance.

Coil Coating Final Applications Transportation Construction Appliances Furniture HVAC Other Goods

Coil Coating Since Pearlescent Pigments have been calcined at over 800°C during their manufacturing process, they can tolerate high temperatures of 260°C to 315°C without any damage to pigment mechanical integrity or optical properties. Not all organic pigments can be used in coil coating applications because of temperature limitations.

Coil Coating Typical Coil Coating line: Stitching the strip to the previous coil Cleaning the strip Power brushing Chemical Pre-treatment Drying Prime Coater 7. Curing 8. Cooling 9. Top coating on one or both sides 10. Second curing 11. Cool down to ambient temperature 12. Rewinding of the coated coil

Decorative Paints Decorative Paints with Pearlescent pigments plays an important roll in the interior paint industry. Silver white series and golden lustre are two the most popular colours for decorative paints Italy, Middle East and South America are the top important markets for Decorative Paints

Leather Coating China is the biggest market for leather and textile coating. Pearlescent pigments are widely used for shoes, upholstery garments, rain coats, umbrella and so on. Pritty supplies environment friendly pearlescent pigments which comply with EU & USA regulations

Wood Coating Wood Coating is used for furniture, wood craft and building materials. Pearlescent pigments can be applied in transparent coatings or non-transparent coatings to bring out the special grain of various types of wood.

Artistic Paints Pritty special effect pigments can be used for both oil or water-based artistic paints. Artists, hobbyists and DIY markets all benefit from the outstanding effect from pearlescent pigments.

Cross-section Weather Resistant Pearlescent Pigment • Additional coating is for external applications: Iridesium – Nacreium • Florida Inland Test • Florida QUV Test with Atlas

Basic Formulation Rules Pearlescent pigments can be incorporated in all coating systems. Use the most transparent formulation possible: Higher formulation transparency means better pearlescent effects with less pearlescent concentration levels More opaque formulations means higher pearlescent pigment dosage and excess of light scattering which destroys the pearlescent effect.

Basic Formulating Rules Grinding and milling of pearlescent pigments is prohibited as this will effectively destroy the pearlescent pigment platelets Use less mechanical stress on the pigments to avoid pearlescent pigment platelets break or metal oxide layer removal Pearlescent pigments disperse well without grinding Example: DO NOT USE

Basic Formulating Rules Spray coating should use particle size less than 10-60 Attention to the compatibility between pearls and paint, especially with water borne system paint For powder coating, choose pearls with no impurity or occasion bigger particle size out of the range to avoid nuzzle blocking

PRITTY Colours