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    Technical Papers

    Evaluating High-Gloss, Direct-to-Metal, FEVE-Based Waterborne Coatings

    ...

    Evaluating High-Gloss, Direct-to-Metal, FEVE-Based Waterborne Coatings
    Figure 1: Alternating structure of FEVE resins.
    Evaluating High-Gloss, Direct-to-Metal, FEVE-Based Waterborne Coatings
    Figure 2: FEVE technology general properties.
    Evaluating High-Gloss, Direct-to-Metal, FEVE-Based Waterborne Coatings
    Figure 3: South Florida weather 1K FEVE color retention.
    Evaluating High-Gloss, Direct-to-Metal, FEVE-Based Waterborne Coatings
    Figure 4: 1K FEVE exterior 2-year Okinawa exposure.
    Evaluating High-Gloss, Direct-to-Metal, FEVE-Based Waterborne Coatings
    Figure 5: QUV-A test of 1K WB FEVE acrylic blends.
    Evaluating High-Gloss, Direct-to-Metal, FEVE-Based Waterborne Coatings
    Figure 6: EIS testing conditions.
    Evaluating High-Gloss, Direct-to-Metal, FEVE-Based Waterborne Coatings
    Figure 7: Resin-free pigment dispersion.
    Evaluating High-Gloss, Direct-to-Metal, FEVE-Based Waterborne Coatings
    Figure 8: Gloss White FEVE Blend.
    Evaluating High-Gloss, Direct-to-Metal, FEVE-Based Waterborne Coatings
    Figure 9: EIS test panels.
    Evaluating High-Gloss, Direct-to-Metal, FEVE-Based Waterborne Coatings
    Figure 10: EIS test results.
    Evaluating High-Gloss, Direct-to-Metal, FEVE-Based Waterborne Coatings
    Figure 11: Initial impedance – Bode plot.
    Evaluating High-Gloss, Direct-to-Metal, FEVE-Based Waterborne Coatings
    Figure 12: Initial impedance – Nyquist plot.
    Evaluating High-Gloss, Direct-to-Metal, FEVE-Based Waterborne Coatings
    Figure 13: 1K WB FEVE over non-abraded CRS.
    Evaluating High-Gloss, Direct-to-Metal, FEVE-Based Waterborne Coatings
    Figure 14: 1K WB FEVE over non-abraded CRS.
    Evaluating High-Gloss, Direct-to-Metal, FEVE-Based Waterborne Coatings
    Figure 15: 1K WB FEVE/acrylic blend over non-abraded CRS.
    Evaluating High-Gloss, Direct-to-Metal, FEVE-Based Waterborne Coatings
    Figure 16: 1K WB FEVE/acrylic blend over non-abraded CRS.
    Evaluating High-Gloss, Direct-to-Metal, FEVE-Based Waterborne Coatings
    Figure 17: CRS prohesion.
    Evaluating High-Gloss, Direct-to-Metal, FEVE-Based Waterborne Coatings
    Figure 18: CRS prohesion.
    Evaluating High-Gloss, Direct-to-Metal, FEVE-Based Waterborne Coatings
    Figure 19: CRS prohesion 60/40 blend.
    Donald C. Lawson III, AGC Chemicals Americas, Inc.07.06.20
    Waterborne coatings are becoming popular because they are more environmentally friendly than other formulations. Although waterborne coatings are commonly used in architecture for aesthetics purposes, their limitations often prohibit use in industrial applications where high performance is required.

    Fluoroethylene vinyl ether (FEVE) water-based resins are unique because they weather as well as solvent-based FEVE coatings. These water-based resins were introduced to the market over a decade ago. Since then, they continue to evolve in their ability to enhance high-performance, low-VOC coatings. 

    The research presented in this article evaluates corrosion inhibitors with blends of various waterborne acrylic and FEVE resins for improved adhesion and appearance after UV exposure and corrosion testing when applied as direct-to-metal (DTM) coatings without primer. Accelerated outdoor UV exposure, electrochemical impedance spectroscopy and cyclic salt fog/UV exposure were used to evaluate corrosion resistance along with gloss and color retention.

    FEVE Chemistry

    FEVE resins were developed in Japan in the late 1970s and commercialized in 1982. FEVE resins are amorphous A-B type copolymers with repeating units of fluoroethylene and substituted vinyl ether. Unlike pure fluoropolymers, FEVE resins are soluble in solvent due to the vinyl ether groups. Solvent solubility transforms FEVE resins from high-performance polymers into high-performance backbone resins for coatings.

    Fluoropolymers, like PVDF (polyvinylidene fluoride), were used in paints prior to the introduction of FEVE resins to the market. PVDF resins are still widely used today. In order to utilize these more traditional fluoropolymers, like PVDF, in liquid coatings, blending with other resins such as acrylics is needed. Special solvents are required to solubilize the blends, and ultimately heat is used to help the system flow and form a thermoplastic coating film.

    In contrast, the FEVE polymer was designed to have inherent solubility in conventional, widely used solvents via vinyl ether monomers. The chemistry of the FEVE polymer also is fully amorphous, unlike the PVDF-acrylic systems that are semicrystalline. This amorphous morphology allows FEVE resins to form films without heat. The implication of this property is considerable. The introduction of FEVE fluoropolymers to the coatings industry brought extremely durable fluoropolymer coatings out of the factory and into the field.

    The fluoroethylene groups are the strength of the FEVE resin (Figure 1). These groups are what make this class of polymers so resistant to UV degradation. The C-F bond is strong. The energy of this bond is ~486 kJ/mol2, while the energy of UV radiation at 300 nm is ~399 kJ/mol. The alternating pattern is critical for the extreme UV resistance properties. The chemically stable and UV-resistant fluoroethylene unit sterically and chemically protects the neighboring vinyl ether unit.

    The vinyl ether groups make FEVE polymers useable as resins for paint. Without the vinyl ether groups, FEVE resins would not be soluble in solvent. This solubility is what allows FEVE resins to be used in a wide array of coating formulations that can be applied in factory or field settings. The vinyl ether groups also contribute to high gloss and allow for functional groups, like hydroxyl groups, to be incorporated into the structure. The general properties of FEVE technology are shown in Figure 2.

    1K DTM Waterborne Topcoats

    This research focused on 1K DTM waterborne topcoats because they offer performance advantages such as no pot life concerns and low VOC, and they do not require on-site component mixing. We conducted the following tests to determine:
    • The corrosion performance of 1K emulsion FEVE DTM with and without the addition of certain acrylic emulsions over non-abraded cold rolled steel (CRS);
    • Gloss and color retention of 1K WB FEVE resin blends with the acrylic emulsions versus acrylic resin alone;
    • Stain and marker removal of 1K WB FEVE resin blends with the acrylic emulsions; and
    • The direct-to-metal (DTM) adhesion of 1K WB FEVE blends with acrylic emulsions.

    Performance Testing

    South Florida Weathering testing of 1K FEVE was conducted for color retention. The results show that three different grades of high-performance TiO2 (titanium dioxide) pigment all exhibit excellent color retention with Delta E values of less than 1.5 after 7-plus years (Figure 3).

    Exterior exposure testing in Okinawa, Japan, of the FEVE-based 1K waterborne emulsion with organic and inorganic pigments illustrates excellent color retention and gloss (Figure 4).

    QUV-accelerated weather testing was used to examine 1K FEVE waterborne acrylic blends against acrylic resin alone. After 10,000 hours, the 50% FEVE/50% acrylic blend demonstrated greatly improved gloss retention when compared to the acrylic emulsion alone. The results also showed an improvement with low-level blends of the FEVE emulsion (7.5% FEVE with 92.5% acrylic) as shown in Figure 5.

    Electrochemical Impedance Spectroscopy

    In electrochemical impedance spectroscopy (EIS) testing, alternating current (AC) voltage is applied at different frequencies to the sample, and the current is measured. Evaluation involves fitting raw data to electrical circuit models. This can determine the contribution of various frequency-dependent components such as capacitors, constant phase elements (CPE) and Warburg diffusion elements.

    The advantages of EIS testing include nondestructive evaluation with low voltage and relatively short time requirements. Other benefits include the ability to progressively monitor the effect of formulation changes, substrate treatments, corrosion resistance, and water absorption.

    For our EIS testing, we selected waterborne emulsion grades of acrylic resins and formulated gloss white TiO2-only (with no extender pigments) coatings. We examined the effect of cosolvent use level and selection on the initial coating impedance, hardness development and overall film formation. Testing conditions are shown in Figure 6.

    We made a resin-free TiO2 pigment dispersion (Figure 7) to use for the gloss white DTM formulations. A gloss white FEVE blend is shown in Figure 8.

    For EIS testing, cold rolled steel and Scotch-Brite™ abraded “water-break-free” aluminum panels were solvent-wiped before application (Figure 9).

    The high impedance (108 ohm cm2 @ 0.1 Hz) values for 1K FEVE emulsion blends with Acrylic 1 indicate excellent initial corrosion resistance (Figure 10). For reference, the Bode plot displayed in Figure 11 and the Nyquist plot in Figure 12, illustrate a near perfect, non-pore coating. In Figures 13 and 14, we see that the absence of free hydroxyl groups hinders the 1K FEVE emulsions direct-to-metal adhesion resulting in low impedance. The blends of the 1K FEVE waterborne emulsion with Acrylic 1 show excellent overall impedance behavior (Figures 15 and  16).

    Results

    Prohesion testing [ASTM D5894] over cold-rolled steel showed that the 60/40 acrylic/WB FEVE blend resisted corrosion after 500 and 750 hours better than the 1K WV FEVE. In Figure 18, the coating is chemically removed to show the corrosion under the film. We suspect that improvements in film formation are the cause of the differences in Figure 19. The only change made was the selection of cosolvent.

    Conclusions

    These tests demonstrated that the 1K WB emulsion FEVE DTM corrosion performance over CRS is markedly improved with the addition of certain acrylic emulsions. They also showed that 1K WB FEVE resin blends, with the acrylic emulsions selected for this study, exhibited higher gloss and color retention over the acrylic resin alone.

    We also saw improved stain and marker removal in the 1K WB FEVE resin blends with the acrylic emulsions selected for this study. In addition, adhesion was greatly improved in the 1K WB FEVE DTM blended with the acrylic emulsions selected for this study.

    Future Studies

    Based on the information gained through this research, the next steps will be to continue evaluations over blasted steel with active inhibitor pigments. We will also evaluate the effects of various extender pigments and new wetting-aid surfactants. 

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