Лако-красочные материалы — производство

The naturally occurring mineral lapis lazuli is found in very few places around the world with the best quality being obtained from Afghanistan and Chile. The name “Ultramarine” meaning from “across the sea” was given to the pigment derived from grinding the mineral. The deep blue color was used by many artists and can be […]

In the EC lead chromate and lead chromate pigments must be appropriately labeled. Such substances must carry the symbols and indications of danger T, Toxic (skull and crossbones) and N, Dangerous for the environment (dead fish/tree) [3.144]. Addi­tionally, the following risk (R) and safety phrases (S) have to be applied: R61 May cause harm to […]

Air: Dust emissions from approved manufacturing plant must not exceed a total mass flow of 5 g h-1 or a mass concentration of 1 mg m-3 for the sum of lead and chromium (TA-Luft) [3.141]. Water: According to latest German wastewater legislation [3.142] for inorganic pigment manufacturing processes discharging directly into public streams ofwater, mass […]

3.4.5.1 Occupational Health Precautions have to be taken and workplace concentration limits have to be observed when handling lead chromate and lead chromate pigments. MAK or Occupational Exposure Limits for lead chromate and lead chromate pigments themselves are not given. General regulations exist for all lead-containing materials. Concentration limits are as follows: It is accepted […]

Chrome greens provide excellent dispersibility, resistance to flocculation, bleeding, and floating, and feature very good fastness properties. This is especially true of fast chrome greens that are based on high-grade phthalocyanine and highly stabilized chrome yellows. They are therefore used in the same applications as chrome yellow and molybdate red pigments (i. e., for the […]

Pigments with brilliant colors, high color stability, very good hiding power, and good resistance to floating and flocculation are obtained by precipitating one component onto the other. Solutions of sodium silicate and aluminum sulfate or magnesium sulfate are then added for further stabilization [3.132]. Alternatively, the components are wet-milled or mixed in suspension and then […]

Chrome green and fast chrome green pigments can be prepared by dry or wet mixing. Dry Mixing The yellow and blue or green pigments are mixed and ground in edge runner mills, high performance mixers, or mills giving intimate contact of the pigment particles. Excessive increase of temperature must be avoided, because this can lead […]

Chrome greens, C. I. Pigment Green 15:77410 and 77600, are combined or mixed pigments of chrome yellow (see Section 3.4.1 and iron blue see Section 3.6) with the formula Pb(S, Cr)O4 + Fe4III[FeII(CN)6]3 — x H2O Fast chrome greens, C. I. Pigment Green 48:77600, 74160 and 74260, are combina­tions of chrome yellow (see Section 3.4.1) […]

Chrome orange [1344-38-3], C. I. Pigment Orange 21:77601, is a basic lead chromate with the composition PbCrO4 — PbO but is no longer of technical or economic impor­tance. This product was obtained by precipitating lead salts with alkali chromates in the alkaline pH range. By controlling pH and temperature, the particle size and thus the […]

Molybdate orange and molybate red are mainly used in paints, coil coatings, and for coloring plastics (e. g., polyethylene, polyesters, polystyrene). The temperature-stable grades are the most suitable for coil coatings and plastics. Molybdate orange and molybdate red feature a low binder demand, good dis­persibility, hiding power, and tinting strength, combined with very high lightfastness […]