“Aesthetics and Performance: FEVE Fluoropolymer Resins for Powder Coatings”

Bob Parker D+D WebinarApril 25, 2013

FEVE Powder Resins

Outline:

Overview of “FEVE” resin technology

Determination of best properties for an FEVE powder coating resin

Introduction of FEVE resin for powder coatings Testing results of formulations made with

FEVE powder resin 2nd Generation FEVE Powder Coating Resin

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FEVE Powder Resins

What is an FEVE Fluoropolymer???1) A hybrid fluoropolymer resin with the ability to be used in standard coatings formulations like any other

conventional coating resin

2) A high performance resin that can withstand severe ultraviolet light exposure 2-3 times longer than

conventional coatings resins

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FEVE Powder Resins

FEVE Fluoropolymer Resins - “FEVE” is abbreviation for “Fluoroethylene Vinyl Ether”

resins for coatings

- Known for their high performance properties:1) Exceptional resistance to UV degradation

2) Superior Chemical Resistance

3) Excellent Thermal Resistance

- Known for their unique formulation properties:1) Solvent soluble

2) Can be cured at ambient temperature with isocyanates

3) Can achieve high gloss formulations

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Fluoroethylene Vinyl Ether (FEVE) Resins

FLUORINATED SEGMENTS: Weatherability, durability, chemical resistance

VINYL ETHER SEGMENTS: Gloss, solubility, crosslinking

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FEVE Powder Resins

Target Properties/Characteristics for an

FEVE Powder Coating Resin

Properties Characteristics

Melting Point Can Simplify Extrusion of the Powder Coating Formulation During

Manufacture

Tg (Glass Transition Temperature) Important in the Retention of Powder Properties when in Storage

Type of Crosslinkable Functional Group

Can affect the Shelf Life of the Powder Coating

Degree of Functionality Affects Film Performance

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FEVE Powder Resins

Test for Choosing the Best Tg for the

FEVE Powder Resin:

1) Prepare powder coatings using several FEVE resins with different Tg properties

2) Place coatings in cylinders and apply 40 gm/cm² force.

3) Place cylinders in 40⁰ C. oven for 24 hours.

4) Check physical state of powder coatings.

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FEVE Powder Resins

Relationship of Tg of Resin and Blocking Properties

of the Powder Coating

Tg of Powder Resin ( C.)⁰ Physical State of the Powder Coating

40 Fused Hard Lump

45 Fused Hard Lump

50 Fused Soft Lump

55 Retained Powder State

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FEVE Powder Resins

Connection between Cure System of FEVE Powder Resin and Shelf Life of Coatings

Functional Group Hardener for Crosslinking

Shelf Life

Hydroxyl (-OH) Isocyanate, Melamine 2 years

Carboxyl (-COOH) Epoxy, triglycidyl isocyanurate

1-1.5 years

Glycidyl (epoxide ring) Amine, acid 3 months

Hydroxyl functionality is the best choice!

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FEVE Powder Resins

Common properties of 1st Generation

FEVE Powder Resin

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FEVE Powder Resins

Typical Powder Coating Formulation

Flow Promoter: Eliminates surface imperfectionsBenzoin: Eliminates pinholes caused by out-gassing

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FEVE Powder Resins

Typical Laboratory Manufacturing Procedure:

1) Add all ingredients together; premix with blade mixer

2) Extrusion of powder coating premix:

a. twin screw extruder w/ 16 mm Bore size

b. 250 RPM @ 120⁰C.3) Grinding with Blade Mixer

4) Filtering of powder through 3 sieves → 180 micron

125 micron

90 micron

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FEVE Powder Resins

Effect of Different Catalysts on Gloss

*1 – used 500 gram weight and ½” diameter ball*2 – ISO 2409 cross cut adhesion test*3 - visual check for degree of orange peel; 1=highest and 10=lowest

Crelan Ui: IPDI NCO adduct; E-Caprolactam blockedCrelan TPLS2147: IPDI NCO adduct; internally blocked

Bismuth Octoate is best catalyst!

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FEVE Powder Resins

Advantages of FEVE Powder over

Conventional Powder resins Produces a hard film

- higher than 2H pencil hardness Has stronger Chemical Resistance to acids, bases, and solvents Demonstrates significant anti-graffiti properties Exceptional Weatherability properties Highly Transparent film

- translates to a high transmittance of a wide spectrum of light rays Impact on application productivity

- FEVE resin has least impact on comtamination

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FEVE Powder Resins

Anti-graffiti Performance

Test: Application of marker for 24 hours; attempted removal with Xylene

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FEVE Powder Resins

ASTM G53

0.0%

20.0%

40.0%

60.0%

80.0%

100.0%

120.0%

0 1000 2000 3000 4000 5000Exposure hours

Glo

ss r

eten

sion

QUV B313 Weatherometer Exposure

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FEVE Powder Resins

Xenon Arc Weatherometer Exposure

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FEVE Powder Resins

Dipla Metal Weatherometer (DMW)- Manufactured by Kato, Inc., which is based in Japan

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FEVE Powder Resins

Dipla Metal Weatherometer

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FEVE Powder Resins

• Test type : Inland weathering• Test location : Miami , Florida (26°N)• Exposure period : 11/30/2000 – 11/22/2010• Type of test : 45°Direct Global• Radiant energy : Total: 62,281 MJ/m2(total) ; 1,488,552

Langleys• UV : 2,863 MJ/m2(295-385nm)

Exterior 10 year exposure:

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FEVE Powder Resins

• Powder Resin : Lumiflon LF710F• Hardener : Crelan VP LS2256 / Bayer• Color : Brown

Exposed Powder Coating Formulation:

Results of Exposure:

60⁰ Gloss retention (%): 60.3Color Change (ΔE): 2.3

Exterior 10 year exposure:

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FEVE Powder Resins

2nd generation FEVE powder resin:

Introduced 3 years ago Improved flow and leveling vs. 1st generation FEVE resin Improved impact resistance and flexibility vs. 1st generation

FEVE resin Comparable to 1st generation FEVE resin in terms

of hydroxyl functionality and Tg

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FEVE Powder Resins

PROPERTIES1st generation

FEVE resin2nd generation FEVE resin

Film Thickness (microns) 50-70 50-70

20⁰ Gloss 50 51

60⁰ Gloss 80 78

Leveling (PCI Standard) 2.5-3.5 6-7.5

Gloss retention after 6000 hours (QUV-B313 exposure) 87% 84%

Mandrel Bend (mm) >8 3

Direct Impact (inch-lbs) 15 30

Reverse Impact (inch-lbs) 10 25

Cross-cut Adhesion (ISO 2409) 0 0

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FEVE Powder Resins

Summary:

FEVE powder coating resins demonstrate exceptional resistance to UV degradation when used in powder coating formulations. while exhibiting the standard

physical properties necessary for manufacturing a stable and easily applied powder coating formulation.