Little knowledge of iron oxide pigments
Date:
2024-04-15 09:27:59
Inorganic color pigments-iron oxide pigments, large, the use of surface is also very extensive. It is widely used in building materials, coatings, inks, rubber, plastics, ceramics, glass products, etc. Because iron oxide pigments have pigment generality, there is a high degree of chemical stability and physical fastness:
Inorganic color pigments-iron oxide pigments, large, the use of surface is also very extensive. It is widely used in building materials, coatings, inks, rubber, plastics, ceramics, glass products, etc. Because iron oxide pigments have pigment generality, there is a high degree of chemical stability and physical fastness:
1. Alkali resistance: It is very stable to any concentration of alkali and other kinds of alkaline substances, especially cement and lime mortar commonly used in construction, and it does not affect the strength of cement building components.
2. Acid resistance: it has certain resistance to general weak acid and dilute acid, but it can also be gradually dissolved in strong acid, especially in the case of heating temperature and concentration.
3. light: in strong sunlight under the same color.
4. Heat resistance: within a certain temperature limit is stable, more than its temperature limit color began to change, with the increase in temperature, the degree of change is more significant, the temperature limit of ordinary iron oxide pigment varieties are as follows:
Iron oxide yellow over 130 ℃ gradually discoloration into red phase
Iron oxide red gradually changes color over 300 ℃ to dark red (Rongchi iron oxide red can generally reach 500 degrees)
Iron oxide violet gradually changes color over 400 ℃ to dark red
Iron oxide black over 100 ℃ gradually change color to dark red
Iron oxide brown over 130 ℃ gradually discoloration into red phase
Iron oxide green over 200 ℃ gradually change color to dark red
(Note: Because the iron oxide manufacturers are different, the limit of high temperature resistance of the products produced will also be different. The above is the temperature limit of the common iron oxide pigment.)
5. Weather resistance: not affected by atmospheric weather conditions such as cold and heat, dry and wet.
6. Dirty air: It is very stable in any dirty gas, such as hydrogen sulfide, carbon oxide, sulfur oxide, hydrogen chloride, nitrogen oxide and other gases.
7. Water resistance, oil resistance and solvent resistance: insoluble in water, various mineral oils, vegetable oils and ethers, esters, ketones, etc. and other organic solvents, and there is no penetration phenomenon.
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