Gold Bronze Pigments Market to Gain a Stronghold by 2025

Gold bronze pigments are scale-like particles, which do not have a regular perimeter. When they are subjected to coating or printing applications, they are oriented parallel to the substrate & the film surface.

Gold bronze pigments are manufactured using cathodic copper & pure zinc. Copper & zinc are alloyed, then undergo atomization to get small particles, and are ground to flakes in ball mills. Multiple grinding stages could be required in case pigments of very fine size are to be obtained. Stearic acid is used as a lubricant to inhibit cold-welding of the pigments. The pigment product is finally subjected to polishing and classifying processes, and the mill charges are standardized by making a homogeneous mixture to produce a standard gold bronze pigment material, which is then filled & stored in drums.

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By varying the copper to zinc ratio, four standard colours of gold bronze pigments could be obtained. These advantages of obtaining standard pigments, along with an ability to obtain large variations of colours by blending gold bronze pigments of different compositions, create a high market potential for gold bronze pigments in the future.

The advantage of gold bronze pigments is that using oxidative treatments, different shades of these pigments could be achieved, such as different shades of brown, gold, orange and red. Also, blending of different compositions of bronze powders could easily yield a vast variety of gold bronze pigments. These characteristics of gold bronze pigments are expected to translate into increased demand from the coatings industries, thereby driving the global gold bronze pigment market.

In recent times, a new range of colourful effect pigments, which were based on gold bronze pigments were introduced. These pigments were specifically developed for application in coatings. Also, copper & copper-zinc pigments are compressed with a thin silica layer, using sol-gel coatings technology.

The objective is that the silica layer would enhance the pigment stability vis-à-vis uncoated pigments, and hence provides a facility for certain modifications of surfaces, and for adjustment & modifying the wetting properties, so as to cater to a vast range of coating systems, and open up new colour styling possibilities. Also, benefits of gold bronze pigments such as a distinct metallic glow, very high resistance to fading in light, high colour intensity, outstanding heat resistance up to temperatures reaching 200 degrees Celsius and high opacity have been driving the global demand growth of gold bronze pigments.

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However, gold bronze pigments are enclosed within a hydrophobic layer of stearic acid, which could move the pigments towards the coating's surface, thereby dislodging their alignment from being fully embedded into the coating's film. Hence, they have poor resistance to abrasion and are very sensitive to corrosion. Also, it has been observed that unprotected gold bronze pigments have a tendency to tarnish, during the curing process of powder coating and during the extrusion process of thermoplastics, thereby, products losing their attractive metallic appearance. This, to an extent, has been proving to be a restraint for the growth of the gold bronze pigment market, at global level.

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