Pigments are substances that make objects color. Pigments have soluble and insoluble, inorganic and organic distinctions. Inorganic pigments are generally mineral substances, and humans have long known that the use of inorganic pigments, the use of colored soil and minerals, on the rock wall painting and smearing the body. Pigment Organic pigments are generally taken from plants and marine animals, such as Violet, Garcinia, and Ancient Rome, Pigment which are extracted from shellfish.
What are the pigments?
Pigments can be structurally divided into organic pigments and inorganic pigments. Inorganic pigments are usually metal oxides, sulfides, sulfates, chromic salts, molybdate, salts, and carbon black. Pigment These pigments are insoluble in ordinary solvents and plastics, and their thermal stability and light stability are generally better than those of organic pigments, but their tinting power is worse than organic pigments. Pigment The relative density of inorganic pigments is larger, generally 2.5 ~ 5.0, and the price is cheaper.
According to its structure, organic pigments can be divided into azo pigments, phthalocyanine pigments, heterocyclic pigments, color deposition pigments, dyes, fluorescent brightener and fluorescent pigments. From the performance of the comparison, although the organic pigments in heat resistance, weathering and covering power than inorganic pigments, but with relatively small density, high tinting strength, Pigment bright color and complete chromatography and other advantages.
Performance characteristics of pigments
Pigments typically have the following properties:
Color。 Color pigments are pigments that selectively absorb and scatter visible light and can
The color of yellow, red, blue and green in natural light.
Coloring force. The ability of coloring pigments to absorb incident light. Pigment Can be expressed as a relative percentage of the tinting strength of a standard pigment sample.
Covering power. The ability to cover the surface color of the substrate in a film-forming material. Commonly used to cover 1 square meters area of paint in the color of the grams of the number of pigments.
Light resistance. The pigment retains its original color performance under certain illumination. Pigment Generally used eight-level system, the best level eight.
Weather resistance. The ability of pigments to maintain their original properties under certain natural or artificial climatic conditions. Generally used five-level system, the best level five.
Volatile matter. Mainly refers to the moisture, Pigment the general stipulation does not surpass 1%.
Oil uptake. The grams of the refined flaxseed oil required for the formation of uniform mass of 100 grams of pigment is good for small oil absorption, and the oil absorption is related to the specific surface area and structure of pigment granules.
Water soluble matter. Pigments contain substances soluble in water, expressed as a percentage of the quality of pigments. Paint used for paints, Pigment the water soluble objects are often controlled under 1%.