pigmentpulver

Pigmentpulver, or pigment powder, refers to finely ground particles of colorant used to impart color to materials. Pigments are generally insoluble in the medium, unlike dyes, and color by scattering and absorption of light rather than dissolving. They are produced in a wide range of chemistries and particle sizes to suit different applications.

Production and properties: Pigment powders are created by grinding or milling raw pigments, often followed by classification to achieve a desired particle size distribution. Typical particle sizes range from submicron to tens of micrometers, depending on the intended use. Particle size, distribution, and surface treatment influence color strength, opacity or transparency, gloss, heat and light stability, and how the pigment disperses in a binder or vehicle. Dispersion quality is crucial for achieving uniform color and minimizing settling in suspensions.

Types: Inorganic pigments include titanium dioxide (white), iron oxides (red, yellow, brown), ultramarine, and chromium compounds, among others. Organic pigments cover a broad range such as phthalocyanines (blues and greens), quinacridones (reds and purples), and diketopyrrolopyrrole pigments. Carbon black is another important pigment class. Some pigments are formulated for special properties like UV resistance, weather stability, or high color purity.

Applications and processing: Pigment powders are used in paints and coatings, plastics, inks, textiles, and cosmetics. In coatings, they provide color, opacity, and durability. Processing typically involves wetting, milling, and dispersion in a suitable binder system, aided by dispersants and stabilizers to prevent agglomeration and sedimentation.

Safety and regulation: Handling pigment powders can pose inhalation risks; dust control and personal protective equipment are recommended. Certain pigments may contain hazardous elements (for example, cadmium or chromium VI) and are subject to regulatory restrictions. Environmental considerations include waste management and compliance with local standards for production and disposal.