15 января, 2016 
Pokraskin Transparent iron oxides have the same fastness properties as opaque iron oxide pigments, but much higher color strength and significantly higher color purity. Table 5.19 summarizes the properties of selected transparent iron oxide pigments [5.192].
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Precipitation process
2 FeS04 + 4 NaOH + 0.5 02————— 2 FeOOH + 2 Na2S04 + H20
2 FeOOH ~Kt~* Fe203 + H20
Combustion process
2 Fe(CO)5 + 6.5 02 ——— * Fe203 + 10 C02
Fig. 5.41 Transparent iron oxide pigments.
Transparent iron oxide pigments are characterized by high UV absorption making them particularly suitable for the coloration of plastic bottles and films for food packaging and the manufacture of wood protection coatings. The precipitated, needle-
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Tab. 5.19: Properties of transparent iron oxides.
Assessment scale: 1 = poor, 5 = very good. |
shaped pigment particles are much more transparent than those produced by the combustion of iron pentacarbonyl, but are also much harder to disperse. The use of fully dispersed pigment preparations can be a good alternative.
5.4.2
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