Effect of dispersion of iron oxide red on coloration power of iron oxide red

According to statistics, at present, 60% of the world’s iron oxide red pigment is used for building materials, 30% is used for paint and paint, which requires iron oxide red with good coloring power and hiding power, in order to improve the color and brightness of the downstream products more beautiful presentation. The dispersibility of red iron oxide pigment also affects the coloring power of red iron oxide.

1.What is the dispersion of iron oxide red?

Dispersion of iron oxide red refers to the ability of iron oxide red pigment to disperse evenly in the product during the coloring process of the downstream product.

2. Factors affecting the dispersion of iron oxide red

The coloring and covering of the products with iron oxide red pigment are accomplished through the complex action of iron oxide red surface and light. The coloring power of iron oxide red  depends not only on the chemical structure of pigment, but also on the particle size of iron oxide red. Red iron oxide pigment dispersion is good, the smaller the particle size, the more concentrated the color, the larger the specific surface area, the effect of light is strong, the appearance of colored products will appear uniform, delicate, less spots, small color difference, to achieve the same coloring and covering effect when the amount of pigment will be reduced, so as to reduce the coloring cost. However, the particles are too fine, which increases the transparency of iron oxide red and reduces the hiding power. The dispersion of iron oxide red pigment not only affects the appearance (spots, strears, luster, color and transparency) and workability of colored products, but also directly affects the quality of colored products, such as strength, elongation, aging resistance and resistivity.

3.Methods to improve the dispersion of iron oxide red
At present, the superfine inorganic pigments used for inorganic base material are generally formed by kneading, caking, difficult to disperse in the base material, and uneven coloring. Therefore, it is of great theoretical and application value to improve the dispersibility and compatibility of ultra-fine iron oxide red pigment in inorganic phase through surface modification research, which is helpful to improve the quality and performance of iron oxide red pigment and increase the added value of iron oxide red pigment.

4.Iron oxide red in the actual construction of paint paint, grasp the external conditions can improve the overall brightness:

(1)to prevent the site humidity is too high: if the construction site humidity is too high (relative humidity exceeds 85%), it will make iron oxide red water absorption white.

(2)The surface of the coating material should be fully cleaned before construction, and the surface treatment should not contain acid, alkali, oil, wax, water, etc.

(3)if the surface of the coated object is too rough or porous, it is necessary to seal the surface with primer, fill and polish with putty, otherwise it will make iron oxide red cloud luster

(4)The matrix in the rain or dew, to wait for the matrix completely dry before construction.

(5) Water content should be controlled to avoid mixing water in construction.