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Estimating Color Fade of PVDF-Based Topcoats for ‘Bright Color’ Architectural Restoration and Protective Coating Applications

Estimating Color Fade of PVDF-Based Topcoats for ‘Bright Color’ Architectural Restoration and Protective Coating Applications
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Many common topcoat standards used for architectural and protective coating applications (e.g., MPI 311, SSPC-Paint 36) include a durability requirement based on the accelerated weathering performance of a white coating. However, there are currently no standards for field-applied coatings which address the needs of specifiers who want to ensure durable color performance in high chroma (saturated, or bright) colors, e.g., Safety Red. 

Product Number: 51217-082-SG
Author: Kurt Wood
Publication Date: 2017
Industry: Coatings
$0.00
$20.00
$20.00

Many common topcoat standards used for architectural and protective coating applications (e.g., MPI 311, SSPC-Paint 36) include a durability requirement based on the accelerated weathering performance of a white coating. However, there are currently no standards for field-applied coatings which address the needs of specifiers who want to ensure durable color performance in high chroma (saturated, or bright) colors, e.g., Safety Red. For several fluoropolymer resin chemistries, there is both outdoor and accelerated data for coatings made using a broad range of pigment chemistries, enabling estimates of outdoor color lifetime to be made with a reasonably high degree of confidence for virtually any color, as long as one stays within the particular resin chemistry space. These principles will be demonstrated with reference to PVDF-based topcoats, where it was found that both the pigment grades and the resin are important factors for determining the color lifetime, along with the pigment volume concentration. The relationship between color retention in south Florida and accelerated testing also depends on the resin chemistry. This finding suggests that a performance-based standard for low-color-fade topcoats should be restricted to specific resin chemistries with proven performance, similar to SSPCPaint 20 for zinc-rich primers, which lists specific binder chemistries. For 3rd-party qualification purposes, to validate the resin system used, accelerated weathering color retention performance standards should be defined based upon a particular reference pigment chemistry (e.g., Pigment Red 254, DPP red, for Safety Red). Because it reliably generates chalking of acrylic systems, similar to what is observed in Florida, UVB-313 fluorescent cabinet testing may be a more reliable test for distinguishing PVDF-based coatings from non-fluoropolymer coatings than UVA-340 testing.

Many common topcoat standards used for architectural and protective coating applications (e.g., MPI 311, SSPC-Paint 36) include a durability requirement based on the accelerated weathering performance of a white coating. However, there are currently no standards for field-applied coatings which address the needs of specifiers who want to ensure durable color performance in high chroma (saturated, or bright) colors, e.g., Safety Red. For several fluoropolymer resin chemistries, there is both outdoor and accelerated data for coatings made using a broad range of pigment chemistries, enabling estimates of outdoor color lifetime to be made with a reasonably high degree of confidence for virtually any color, as long as one stays within the particular resin chemistry space. These principles will be demonstrated with reference to PVDF-based topcoats, where it was found that both the pigment grades and the resin are important factors for determining the color lifetime, along with the pigment volume concentration. The relationship between color retention in south Florida and accelerated testing also depends on the resin chemistry. This finding suggests that a performance-based standard for low-color-fade topcoats should be restricted to specific resin chemistries with proven performance, similar to SSPCPaint 20 for zinc-rich primers, which lists specific binder chemistries. For 3rd-party qualification purposes, to validate the resin system used, accelerated weathering color retention performance standards should be defined based upon a particular reference pigment chemistry (e.g., Pigment Red 254, DPP red, for Safety Red). Because it reliably generates chalking of acrylic systems, similar to what is observed in Florida, UVB-313 fluorescent cabinet testing may be a more reliable test for distinguishing PVDF-based coatings from non-fluoropolymer coatings than UVA-340 testing.

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