2 nd generation FEVE powder resin

Report
“Aesthetics and Performance:
FEVE Fluoropolymer Resins for
Powder Coatings”
Bob Parker
D+D Webinar
April 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
2
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
FEVE Powder Resins
Target Properties/Characteristics for an
FEVE Powder Coating Resin
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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
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
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Tg of Powder Resin (⁰C.)
Physical State of the Powder
Coating
40
Fused Hard Lump
45
Fused Hard Lump
50
Fused Soft Lump
55
Retained Powder State
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 imperfections
Benzoin: 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
Crelan Ui: IPDI NCO adduct; E-Caprolactam blocked
Crelan TPLS2147: IPDI NCO adduct; internally blocked
Bismuth Octoate is best catalyst!
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*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
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
QUV B313 Weatherometer Exposure
ASTM G53
120.0%
Gloss retension
100.0%
80.0%
60.0%
40.0%
20.0%
0.0%
0
15
1000
2000
3000
Exposure hours
4000
5000
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
Exterior 10 year exposure:
•
•
•
•
•
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)
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FEVE Powder Resins
Exterior 10 year exposure:
Exposed Powder Coating Formulation:
• Powder Resin : Lumiflon LF710F
• Hardener : Crelan VP LS2256 / Bayer
• Color : Brown
Results of Exposure:
60⁰ Gloss retention (%): 60.3
Color Change (ΔE): 2.3
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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
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PROPERTIES
1st generation
FEVE resin
2nd 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
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.
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