What is the difference between dyes and pigments?
Pigment and dyestuffs Pigments are a kind of fine powdery colored material, generally insoluble in water, oil and solvent, but can be evenly dispersed in it. Pigment is the secondary film forming material of paint, in the wood decoration process modulation primer, putty and wood coloring, but also often use the pigment.
Pigments are mainly used in the presence of inorganic compounds. Colors are a kind of colored material that can be attached to various fibers and other materials directly or by the action of the mordant. Can be combined with the dye compounds, mostly organic compounds.
Pigment is a macro name, he refers to some of the other things can be dyed things, the pigment can not be said that a compound should be a mixture, which should contain dyes. Dye is not necessarily a mixture, he can be a pure compound, generally refers to organic matter. It can be stained in addition, many dyes in the color after the object will have a new function. For example, too sensitive to the photosensitive plate in the cell has a photosensitive property is stained by dyes, this dye can also be called photosensitizer. As for the pigment generally refers to the organic macromolecules, it is generally natural extraction from the plant body, such as chlorophyll, carotene are pigments. There are also pigments in the human body, like melanin what, the formation of senile plaques is due to a decrease in the activity of an enzyme in vivo lead to pigment deposition. But now there are a lot of synthetic pigment.
Dye refers to a certain medium, can make the fiber or other substances firmly colored compounds. We introduce dyes and pigments that are limited to organic compounds. Ancient dyes take automatic plants. In 1856 Perkin invented the first synthetic dye - Mawei Violet, which made organic chemistry separate from a new discipline - dye chemistry. 1950s. Pattee and Stephen found that dyes containing dichlorotriazinyl groups were bonded to the hydroxyl groups on the fibers under alkaline conditions, marking the dye making the fiber coloring from the physical process to the chemical process, creating a synthetic application of reactive dyes The At present, the dye is not limited to the dyeing and printing of textiles, it is in paint, plastic, paper, leather, optoelectronic communication, food and many other departments to be applied.
