What is the Pigment dyes Pigment dyes is the common dyes for washingplant , Pigments are used for coloring paint, ink, plastic, fabric, cosmetics, food and other materials. Most pigments used in manufacturing and the visual arts are dry colorants, usually ground into a fine powder. This powder is added to a vehicle (or binder), a relatively neutral or colorless material that suspends the pigment and gives the paint its adhesion.
A pigment changes the color of reflected or transmitted light as the result of wavelength-selective absorption. This physical process differs from fluorescence, phosphorescence, and other forms of luminescence, in which a material emits light
Type of Pigment dyes In today's world, there is a large number of Pigments available. In fact after the advent of Synthetic Pigments there has evolved various classes of pigments that are suited to particular types of Industries. Few Examples of inorganic pigments: lead oxide, cobalt blue, chromium oxide, cadmium yellow, molybdate orange, and nickel titanate. As new environmental laws are very strict about toxicity a few of these heavy metal pigments are no longer in use Metallic Pigments Metallic Pigments give bright effects, due to this they are widely used and are a very popular category of pigments.
Metallic pigments, can be of two types aluminum and zinc.
Glittering silver effects are achieved in the widest variety of different applications by the use of various forms of aluminium pigments. They are further divided into two categories namely leafing grade and non-leafing grade. The aluminum pigments are produced from aluminium that has purity in the range of 99.3-99.97%. The particle has lamellar shape with 0.1-2 um in thickness and diameter of 0.5-200 um. These pigments founds use in automotive topcoats.
Some of the preferred applications of Aluminium Pigments are the following:
The anti-corrosive properties of zinc have been well-known for decades. Zinc pigments represent an almost ideal combination of the active anti-corrosive properties of the metal itself with the protective barrier effect of leaf-shaped pigments.
Zinc Pigments come in two forms of powder and dust. Usually the zinc dust is finer as compared to powder and is spherical in shape. The dust also has a light coating of zinc oxide. The following table cites some popular Zinc Pigments along with their applications.
Zinc dustChemical applications Metallurgical applications
Zinc phosphateActive ingredient in domestic cleaning products
Zinc oxideAgricultural applications
Ceramics Industrial Pigments A few popular pigments have been given below that have very wide uses: (1) CLC Pigments ,
(2) DPP Pigments ,
(3) Effect Pigments ,
(4) Fluorescent Pigments ,
(5) Inorganic Pigments ,
(6) Natural Pigments ,
(7) Mixed Metal Oxide Pigment ,
(8) Carbon Black
Natural Iron Oxide Pigments ,
(9) Organic Pigments ,
(10) Organic vs Inorganic Pigments ,
(11) Phthalocyanine Pigments ,
Quinacridone Pigments ,
(14) Synthetic Iron Oxide Pigments ,
(15) Titanium Dioxide
Ultramarine Pigments . Refractive index and Classification of pigments
Pigments are used to give color and protect the substrate. To provide color to a material pigment should create an opacity. There is a particular limit to the concentration of pigment particles in a coating determined by the pigment volume concentration (PVC). This is the reason for having pigment particles with a high refractive index.
Based on such refractive index, pigments can be divided into two categories of hiding and extender pigments Hiding pigments:
These pigments possess generally refractive index values that are greater than 1.5. Examples: titanium dioxide, zinc oxide, lithophone etc.
These pigments have refractive index values that are close to 1.5. Examples: calcium carbonate, silica, alkali and alkaline earth metal silicates etc. Selection of Pigment and Binder Stability If you are considering pigmentation of a system, that is inherently unstable, for example an unstable binder that is to be pigmented with Titania, the selection of the pigment is then for both coloration and function. While formulating a colored coating, the pigment's role should be as an UV absorber or reflector. Thus blocking UV transmission through the binder, where degradation takes place. Performance Criteria for commercial organic pigments The commercial performance of organic pigments are guided by the following capabilities:
*.Resistance to heat
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