Application of Iron Oxide Red in Paint

Paints and coatings are formulated products of a multi-component system, and generally cannot be used as engineering materials alone. The amount and relative proportion of each component in the paint formulation have a great impact on the performance of the paint (such as leveling, dryness, etc.) and film (such as gloss, hardness, etc.). Therefore, the paint must be formulated to meet all requirements.

Factors to be considered in the formulation design of coatings and paints include: substrate, purpose, performance, construction environment, application environment, safety, cost, etc.

Iron oxide red is one of the pigment raw materials of various red paint. There are many kinds of paints on the market, including iron oxide red antirust paint, epoxy iron oxide red antirust paint, acrylic iron oxide red antirust paint, etc. The iron oxide red in the middle refers to iron oxide red.

Iron oxide red is an inert pigment with good chemical stability, heat resistance up to 1200 ℃, acid and alkali resistance, and plays an important role in protecting the surface of the coating from natural erosion and damage.

As a traditional and classic inorganic pigment and toner, ferric oxide red pigment has the characteristics of environmental protection, low cost, high coloring power, good dispersion, etc., and is widely used in the color construction industry. In the paint industry, ferric oxide red is widely used as the raw material of solvent based paint and water-based paint in production practice.

The hiding power of iron oxide red is inferior to that of carbon black. Covering power is one of the properties required for raw materials of coatings and paints. With strong covering power, coatings and paints can save materials and costs in construction, because only a small amount of coating can cover the bottom color, reducing the number of construction times.

The reference pigment amount for general paint formula: primer 25-30%; Ready mixed paint 20-30%; Enamel 15-25% (excluding body pigment)

Waterborne paint: appropriate amount according to different colors.

Using iron oxide pigment to process exterior wall paint and exterior wall paint has low cost, durable color, and the disadvantage is that the color is not too bright.

Function and precautions of ferric oxide red in paint application:

1 Iron oxide red is mainly used for coloring and protecting substances in various coatings and paints, including water-based interior and exterior wall coatings, powder coatings, etc; It can also be applied to various primers and topcoats such as epoxy, alkyd, amino, etc; It can also be used for toy paint, decorative paint, furniture paint, electrophoretic paint and enamel. Make the wall more smooth and delicate, the red color on the surface is more uniform, and there will be no dazzling phenomenon.

2 The particle size of iron oxide red is 0.2 μ When m, there is a yellow phase, and the specific surface area and oil absorption are also large. When the particle size becomes larger, its color changes from red phase to purple, which can increase the mechanical strength of the coating to a certain extent.

3 The ferric oxide red water soluble salt used in the antirust paint should be low, which is more conducive to improving the antirust performance. Especially when the chloride ion increases, the water will easily penetrate into the coating, and also accelerate the corrosion of metal.

In the application of iron oxide red in paints, oil absorption is a very important indicator. Like the application of other pigments, the wetting of ferric oxide red in the application system is an important link in the whole dispersion process. The wetting effect of iron oxide depends on the degree of affinity between the surface morphology of the dispersion medium and iron oxide red pigment, and the interaction between the molecular morphology of the dispersion medium and the agglomeration structure space of iron oxide red pigment.

5 Because of its excellent purity and quality, synthetic iron oxide pigments have been the main varieties used in the downstream paint market of iron oxide red since 2015. Natural iron oxide red is expected to grow more rapidly in the next eight years due to its low price and abundance. The application of iron oxide pigment in the paint and coating market is expected to achieve a rapid growth rate. When it is applied in the coating field, the iron oxide pigment also needs to keep the film strength while continuously optimizing its coloring effect.

Extended reading:

Several red pigments commonly used in paint:

(1) Iron oxide red. The chemical composition of iron oxide red is ferric oxide, which is called iron red for short. Its light resistance, weather resistance and chemical stability are very good. Its hiding power is the best among red pigments, but its acid resistance is poor. The color of iron red is red with black, not bright enough.

(2) Toluidine red.

Toluidine red, also known as scarlet and toluidine red, is a red pigment with the best fastness and bright red color. It has high water resistance, oil resistance, acid and alkali resistance. Soft texture, easy to grind. It is not easy to disperse in water-based coatings, and it is beneficial to improve the dispersibility after surface treatment.

(3) Pink.

Red powder is an azo pigment with good fastness, bright color, loose texture and easy dispersion, acid and alkali resistance, light resistance and heat resistance. Compared with toluidine red, the price is lower, so it is used more in architectural coatings.

(4) Cadmium red.

Cadmium red is a compound of cadmium sulfide and cadmium selenide. It has good coloring power, hiding power, light resistance and weather resistance. The color light varies with the content of cadmium selenide. The more cadmium selenide content is, the stronger the red color light is. It is a very bright red pigment. However, due to its high price, it is seldom used in ordinary architectural coatings.