How to Choose Pigments for Water-based Color Paste

When we talk about paint pastes, most of them are water-based color pastes. The quality of the pigments directly affects the quality of the water-based color pastes. Therefore, when selecting pigments for water-based color pastes,we should pay attention to the following matters:

👉 1. Water-based color paste manufacturers prefer pigments with bright colors and stable performance. When designing color mixing formulas, they should try to choose color pastes with good weather resistance and light resistance.

Although inorganic pigment pastes have good light resistance and are cheap, they are not very bright and cannot produce highly saturated colors.
Organic pigment paste have bright colors and high tinting power. They have high saturation when blending dark or light colors, but their light resistance and weather resistance are poor. If the two can be used in combination, it can not only satisfy the hue and saturation, but also ensure the light resistance and weather resistance of the color, and the price is economical and affordable.

👉 2. To test the coloring strength of pigments in a water-based system, you can do a simple water-based color paste formula test in the pigment factory laboratory. Use high-speed stirring and dispersion method, disperse at high speed for 180-300 minutes, and get the color. Slurry, adding 2% water-based binder can reflect the coloring strength in the water-based system.

👉 3. The stability of the pigment in the water-based color paste system with high content should also be tested.
The range of pigment addition in water-based color pastes is very wide. Resin-containing water-based inks are generally 5~10%, resin-free organic pigment water-based color pastes are generally 20-50%, and resin-free inorganic pigment water-based color pastes are generally 5-10%. 40~80%.

4. When selecting pigments for water-based paste, you should also pay attention to their chemical properties, such as acid and alkali resistance.

5. The batches of water-based color paste pigments must also remain stable. Once the standards are determined, the conditions when the reaction occurs during the pigment synthesis process must be strictly controlled to ensure the color stability of the water-based color paste under various weather conditions.

6. Safety indicators of water-based colorants and pigments.

Pigment manufacturers not only need to pay attention to the surface of the pigment, but also choose safe raw materials. During the pigment synthesis process, they should confirm whether the reaction is sufficient and whether there are any residues of raw materials. When selecting equipment, pay attention to the use of safe equipment and pipelines,but also pay attention to problems such as residues of plasticizers and other substances in paint packaging bags.

Hangzhou Dingli Chemical Co.,Ltd is professional pigment manufacturer, who can provide you satisfied pigments for water-based color paste.