Powder Coating Metallic Hue via Pigment Alignment
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Solution Overview
Problem
Conventional powder coating materials with metallic pigments struggle to achieve a metallic hue and concealing property due to poor pigment alignment, and they have inadequate weather resistance.
Innovation Solution
A powder coating material comprising a fluororesin, a resin with a higher solubility parameter, and a metallic pigment covered with a specific covering material, where the pigment's SP value is between that of the fluororesin and the resin, facilitating layer separation and pigment alignment for improved hue and weather resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a metallic pigment is used in a powder coating material, then the coating film can provide metallic hue, but the metallic pigment tends to be hardly aligned parallel to the substrate, resulting in low luster and insufficient metallic hue
Solution Approach 1:
The patent introduces a bonding technique that attaches a metallic pigment to the surface of powder particles through an intermediary bonding agent. This intermediary substance facilitates the alignment of metallic pigment particles parallel to the substrate during the coating process, thereby achieving sufficient metallic hue and luster while maintaining the powder coating's environmental benefits
Solution Approach 2:
The patent modifies the surface properties of powder particles by changing parameters such as surface charge, surface roughness, or surface chemistry through the bonding technique. These parameter changes enable better interaction between the metallic pigment and the powder particle surface, facilitating alignment and achieving the desired metallic effect
2Adaptability or versatility
If acrylic resin-type, polyester resin-type, or epoxy resin-type powder coating materials are used, then the coating material can be widely applied, but the cured film is inferior in weather resistance
Solution Approach 1:
The patent creates a composite coating structure by bonding metallic pigment to powder particles using a bonding agent that combines different resin types. This composite approach integrates the advantages of various resin systems (acrylic, polyester, epoxy) while achieving superior weather resistance that individual resin types cannot provide alone
3Manufacturing precision
If the content of metallic pigment is increased to improve concealing property, then the concealing property may be improved, but adhesion of the coating film to the substrate will be thereby lowered
Solution Approach 1:
The patent applies local quality by concentrating metallic pigment on the surface of powder particles through the bonding technique rather than distributing it uniformly throughout the coating formulation. This localized concentration provides sufficient concealing property at the surface while maintaining lower overall pigment content, thereby preserving adhesion strength
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables the formation of a coating film with enhanced metallic hue, concealing property, and weather resistance by aligning the metallic pigment and separating the layers for optimal performance.
Implementation Method 1
when the powder coating material is melted and cured, the fluororesin and the polyester resin will be layer-separated without being compatibilized
Implementation Method 2
a bonding technique to attach a metallic pigment to the surface of powder particles
Data Source
AI summary
The invention provides a powder coating material capable of forming a film excellent in metallic hue, concealing property and weather resistance. The powder coating material comprises the following fluororesin (A), the following resin (B) and the following pigment (C) as constituents thereof, wherein the content of the pigment (C) is from 0.7 to 23 mass %; Fluororesin (A): a fluororesin having a fluorine content of at least 10 mass %; Resin (B): a resin having a SP value larger than that of the fluororesin (A), and the difference between the SP value thereof and the SP value of the fluororesin (A) is at least 0.4 (J/cm3)1/2; Pigment (C): a pigment which is a metallic pigment covered with a covering material, and the SP value of the covering material exceeds the SP value of the fluororesin (A) and less than the SP value of the resin (B).