Dyes & Pigments- Application, Uses, Properties, & Type :

Imparting color to a material is done by substances called Dyes, Pigments, and their intermediates. The term colorant is often used for both dyes (also called dye-stuffs) and pigments.

Particle size is the major difference between dyes and pigments and they are thicker than Dyes. Therefore dyes are not UV stable whereas pigments are usually UV stable. Dyes are also known as a colorant and in this the coloring matter is dissolved in liquid and is absorbed into the material to which they are applied.

Direct dyes are used on cotton, paper, leather, wool, silk, and nylon. They are also used as pH indicators and as biological stains. 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.

Properties of pigments are lightning in weight which will use to create high volume, small particle size, high tinting strength, transparency, or semi transparent. Properties of Dyes that it itself fixes to fabrics, has fastness properties such as fastness to light, diluted acid, base, and various organic solvents.

Some different types of dyes were Acid, Natural, Basic, Synthetic, Direct, and are soluble in many liquids and are organic compounds. Pigments are of 3 types and generally inorganic in nature, with insoluble in water and also in most of the solvents.

Pigments- Coloration & Surface Effects

Pigments are organic or inorganic particles added to the polymer base to give a specific color or functional benefits the plastic. They are classified as either organic or inorganic.

Organic pigments are based on carbon chains and carbon rings. However, they can also contain metallic (inorganic) elements that help to stabilize the properties of the organic component. Pigments that are organic in nature are hard to disperse. Inorganic pigments are chemical compounds not based on carbon, which are usually metallic salts precipitate from solutions.

Inorganic like: Metal oxides and sulfides, Carbon Black gets more easily dispersed in the resin. Between the inorganic pigments titanium dioxide is the most widely used pigment in the plastics industry. Organic Pigment Types are the Metal complex. Inorganic Pigment Types are Titanium dioxide white, Lead chro-mate and Iron oxide.

What Dyes are used for Textiles?

There are two types of dyes used for textiles - Synthetic and Natural Dyes. Synthetic dyes are man-made dyes and are classified according to their chemical composition as well as the method of their application in the dyeing process, Natural dyes, on the other hand, are categorized into three types: natural dyes that come from plants and are called Indigo; those that come from animals are called cochineal, and those that were gained from minerals are called Ocher.

Introduction to the Color Index

Each Dye gets identified by a unique five-digit number, which is called CI or color Index number. Apart from the number, the each dye is given a Generic name or CI name, the name is based on the base action, dyes mode of behavior, and the action. The CI name thus gives a specific way in which dyes can be identified.

Changing Trends in Dyes of Paper Industries!

One of the major industries where pigments occupy a place of importance is the paper and pulp industry. The most common used groups of pigments in this industry are Standard pigment dispersion line, Fluorescent pigment dispersion line, and the Specialty pigment coatings line.

Paper Industries are widely using dyes form last so many decades. By looking at the growth in the paper industry, it can be safely assumed that Dyes for the paper industry has a very promising future.

The dyes that are used include sulfur dyes and cat-ionic direct dyes. Other than these two popular options acid dyes and basic dyes are also used. Sulfur dyes are reduced alkaline solutions.For example to get the color black, a polymer is obtained by the result of a reaction between 2, 4 di nitro phenol, and sodium poly sulfide.

An extensive range of shades are available in the Standard category and these are generally used in operations involving better dyeing. In the Fluorescent category, the colors are brilliantly fluorescent and can be inter-mixed to churn out highly interesting shades.

Applications or the system not requiring too much of lightfastness find this type of pigment class very useful. The Specialty pigment coatings include a specific class of non-metallic pigments that go very well with several latex binder systems. Gold and silver pigments come in this category. This type of pigment is, however, not suitable for operations involving beater dyeing.

Pigments are used in the coloration of paper. The percentage of the red and yellow parts of the visible spectrum has to be decreased in order to decreased the brightness of the paper. In such cases, pigments that absorb these parts can be added. Their addition will reduce the paper’s brightness as desired quite contrary to the result attained with an optical brightening agent.

According to pigment synthesis medical research, to increased the paper whiteness then pigments are used along with an optical brightening agent. At such times, violet and blue dyes are the most commonly used pigments.

Buy various types of colors that are available to us at a good price.

Pigments find wide applications within the paper industry. These are:

-Printing paper

-Writing paper

-Tissues papers for various uses such as facial tissues, paper napkins

-Decorative papers

-Envelopes

-Corrugated Boxes

-Labels, tags, posters

-Visiting cards and all types of invitation cards