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“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
3
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.