Plastics

New PDF release: Coloring of plastics : fundamentals, colorants, preparations

By Albrecht Muller

The winning coloring of plastic components, starting with the formula of the colour instruction and finishing with the manufacture of the ultimate product, is the results of the interplay of chemical, actual, and technological components. In-depth wisdom of those components and their interrelation and the honour of nationwide and foreign rules are prerequisite for a person operating during this box.

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The fastness of each blue dye is graduated in such a manner that the time required for a significant change in color doubles from step to step. If testing the light fastness the colored plastic specimen and these samples are together exposed to light until the standard shows a significant change in color. The change may be in the shade, the brightness, and/ or intensity of color. A color change is considered to be significant when it equals step 3 or 4 on the gray scale for evaluation of color change.

Another disadvantage to some extent is the known incompatibility of polymers when blended with each other. It is therefore recommended that one use the same type of polymer as carrier for the color preparation that will be colored later, and vice versa. Sometimes so-called “universal batches” are offered on the market. The word “universal” is derived from the Latin and means all-embracing; in other words the carrier of such a universal batch should be compatible with any other polymer. Our own practical experience denies this, which is not surprising when we consider the variety of chemical different types of polymer.

A combined influence of light and weather (humidity) will generally damage an organic colorant and polymer much faster than light alone. The adverse effect of humidity is well known in chemistry and may be demonstrated with an everyday example. A paint or lacquer for wood can be stored in a tightly sealed container for quite a while. After application to wood the paint will cure within a short while because of the humidity in the air. Several organic colorants show good light fastness but insufficient weather resistance.

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