22 октября, 2015 
Pokraskin All synthetic iron oxides possess good tinting strength and excellent hiding power. They are also lightfast and resistant to alkalis. These properties are responsible for their versatility. The principle areas of use are shown in Table 3.3 [3.49, 3.50]. The main usage is in the construction industry followed by coatings but this differs by geographical region.
|
Tab. 3.3: M ain areas of use for natural and synthetic iron oxide pigments.
|
Iron oxide pigments have long been used for coloring construction materials. Concrete roof tiles, paving bricks, fibrous cement, bitumen, mortar, rendering, etc. can be colored with small amounts of pigment that do not affect the setting time, compression strength, or tensile strength of the construction materials. Synthetic pigments are superior to the natural pigments due to their better tinting power and purer hue.
Natural rubber can only be colored with iron oxides that contain very low levels of copper and manganese (Cu <0.005%, Mn <0.02%). Synthetic rubber is less sensitive. In the paint and coating industries, iron oxide pigments can be incorporated in many types of binders. Some reasons for their wide applicability in this sector are pure hue, good hiding power, good abrasion resistance, and low settling tendency. Their high temperature resistance allows them to be used in enamels and ceramics.
The low tendency of migration and bleeding is of great advantage in plastics. Pure grades of iron oxide pigments are allowed for coloring of plastic articles for food and commodities [3.51].
The use of iron oxide as a polishing medium for plate glass manufacture has decreased sharply with the arrival of the float glass technology.
3.1.1.6
Опубликовано в рубрике 