The use of color paste in coatings is very common, but now there are many color paste products, uneven. Therefore, it is necessary to understand the influence of the color paste on the coating, so as to select the appropriate water-based color paste.

1. Solvent resistance

The color paste is made of resin and has good compatibility. The main resin in the color paste is relatively soluble in organic solvents, which affects the solvent resistance of the final coating film.

2. Tinting strength or tinting strength

The tinting strength of the coating indicates the intensity of the color of the coated surface. When adjusting the same color, the stronger the tinting strength, the less the amount of color paste, the lower the water resistance of the coating, and the smaller the effect on the performance of the coating film. So the same color, different manufacturers of product quality will be very different. The strength of the tinting strength depends not only on the performance of the pigment, but also on the degree of dispersion of the pigment. The greater the degree of pigment dispersion in the color paste, the stronger the coloring power. How to improve the dispersion of pigments in the color paste requires a good dispersant and a correct grinding method. At present, polymeric dispersants have been widely used, and their steric resistance can stabilize the dispersion of pigments. The pigment dispersion effect is poor, which not only affects the hue and coloring ability, but also has potential flocculation and even fading due to the mismatch with the paint. Pigments with strong coloring ability can also improve the yield. For example, using a high concentration colorant slurry, more product can be produced with the same weight of milled colorant. Energy consumption and costs will also be reduced.

3. Fineness

The fineness of the pigment will affect the dyeing performance and gloss of the paint. The finer the pigment, the higher the dyeing power, but not the finer. Too fine will affect the coverage. In addition, pigments such as phthalocyanine blue and phthalocyanine green are small molecule pigments. Their fineness is too small, the particle size difference is large, the dispersion is poor, the compatibility with the coating is poor, the color matching cost is high, and the color is bright.

4. Acid and alkali resistance

The acid and alkali resistance of architectural coatings is an important performance index. For example, iron blue or chrome yellow will decompose when encountering alkali, and gray calcium powder and calcium carbonate will react with acid, so you should pay attention to the choice when using it. If you choose the price is very low, non-professional production of latex paint manufacturers to produce yellow, blue, etc., because the price is very low or do not know its pigment performance, latex paint will soon appear fading, pulverization and other phenomena. Color paste has a wide range of applications, so we should choose pigments suitable for different fields to prepare color paste. Users should pay attention to choosing color paste when choosing color paste.

5 Compatibility

Coatings in the use of color paste before the need for compatibility tests, such as floating color observation, finger research test. The poor compatibility of the color paste will not only cause the paint to float, but also fade. In addition, the flatness of the color paste after the color is also affected by the compatibility.