Introduction and Application of Iron Oxide Pigments

August 15, 2024

Iron Oxide pigment is a type of inorganic color pigment with a large quantity and a wide range of applications.
Widely used in industries such as building materials, coatings, inks, rubber, plastics, ceramics, glass products, hardware and glass polishing, theatrical oil painting, painting, cosmetics, drug coloring, photocopying materials, catalysts, electronics industry, and magnetic memory materials for audio and video recording.
The color of iron oxide pigment is very clear and pure, without the need for other organic or inorganic pigments to be added for polishing. Although not as vibrant and eye-catching as some organic or other pigments, the color tone of iron oxide pigments has a unique style, with soft and harmonious tones that are pleasing to the eye and approachable
Iron oxide pigments have high coloring power and fine and uniform particle size
Has high chemical stability and physical fastness:
Alkali resistance: to any concentration of alkali and other types of alkaline substances, especially in buildings
The commonly used cement, lime mortar, etc. are very stable and do not cause powdering or affect the strength of cement building components.
Acid resistance: It has certain resistance to weak and dilute acids, but can gradually dissolve in strong acids, especially under heating and concentration conditions.
Light resistance: The color remains unchanged under strong sunlight exposure.
Heat resistance: Stable within a certain temperature limit, beyond which the color begins to change. As the temperature increases, the degree of change becomes more significant
Climate resistance: not affected by atmospheric conditions such as cold, heat, dryness, and wetness.
Resistant to polluted air: It is very stable in any polluted gas, such as hydrogen sulfide, carbon oxide, sulfur oxide, hydrogen chloride, nitrogen oxide, etc.
Waterproof, oil resistant, solvent resistant permeability: insoluble in water, various mineral oils, vegetable oils, ethers, esters, ketones, and other organic solvents, and without any permeation phenomenon.
Iron oxide pigments are divided into four series according to pigments, namely: red, yellow, brown, and black.
The use of iron oxide pigments
1. Used for cement building materials
Due to its excellent weather resistance, alkali resistance, and light resistance, these properties cannot be possessed by other inorganic or organic pigments
Therefore, iron oxide pigments are used as coatings and coloring agents in building materials.
For example: wall decoration, artificial marble, ground stone flooring, and coloring of silicate products. Iron Oxide Yellow used for the exterior walls of temples on airplane runways with colored cement or concrete pavement
2. Application in paint
Has good weather resistance, high purity, good thermal stability, good compatibility with other components in the application system, can absorb ultraviolet rays, and prevent degradation of the base material,
Can be widely used in coatings and paints. Due to its strong covering power, it has extremely strong impermeability to ultraviolet rays and very little water absorption, which can enhance the mechanical strength of the paint film, especially in terms of adhesion. Other anti rust pigments have excellent characteristics
For example, the mixed use of red lead, zinc yellow, etc. can enhance the stability and mechanical strength of the paint film
It is widely used in various outdoor paints, transportation paints, metal rust prevention primers and topcoats. The iron oxide pigments used in coatings and paints include iron red, iron yellow, iron brown, iron black, iron green, mica iron oxide, and transparent iron oxide products, among which iron red products are widely used. Transparent iron is most suitable for use in automotive topcoats, wood coloring, canning coatings, pharmaceutical packaging coloring, and other fields.
3. Used for rubber and plastic
In the application of rubber and plastics, Iron Oxide Red, which does not contain heavy metal ions such as copper and manganese, can be used for aviation tires to prevent rubber aging.
Iron oxide pigment has the characteristics of strong coloring power and pure color. It is used as a coloring agent and filler in PVC plastic flooring and PVC colored films. It can be used in thermosetting plastics such as electric jade powder, bakelite powder, and thermoplastic plastics such as polyolefins
Iron oxide pigments, such as Color Masterbatch or paste preparations, will be more popular in the materials industry.
Due to the non-toxic nature of iron oxide pigments, transparent iron oxide pigments are used abroad for coloring plastic beer bottles, pharmaceutical small bottles, and food packaging plastics. They are a new type of pigment used for plastic additives.
4. Used for coloring food, medicine, cosmetics, and makeup oil paints
In terms of chemical stability, iron oxide is an ideal pigment for cosmetics.
This pigment is relatively easy to disperse and insoluble in water, alkali, and organic solvents. Its colors range from yellow and red to black and brown, with rich hues.
Iron oxide is opaque and has strong covering power. The only drawback is that the color is not bright enough, and yellow and black pigments are prone to discoloration at around 150-200 ℃.
Colorants for various cosmetics: such as soap, nail polish, facial oil, skin cream, cosmetic pen, lipstick, and cigarette paper.
And it is also used as an additive for cosmetics, oil paints, painting pigments, and pet feeding materials.
5. Used for ceramics
Iron oxide pigments have excellent coloring properties. When iron oxide is added to their glaze, the color tone of the glaze becomes richer and brighter.
The application of iron oxide as a raw material for building ceramics: mainly used in wall and floor tile products, imitation granite, unglazed porcelain tiles, and purple clay pottery products.
The application of iron oxide in ceramic glazes: mainly used to mix glaze water of various colors. Such as celadon glaze, rabbit hair glaze, oil drop glaze, etc.
6. Some other uses
Iron oxide pigments are also used in colored chalk, colored matches, leather coloring and coating agents, and so on.

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