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What are the functions of dispersants for waterborne coatings?

2021-01-18 17:12:00

As a company specializing in the production of dispersant, Super Speed Technology Co., Ltd. here to explain the role of water-based paint dispersant. The dispersing agent of waterborne coatings uses wetting dispersing agent to reduce the time and energy needed to complete the dispersing process, stabilize the dispersed pigment dispersion, modify the surface properties of pigment particles, and adjust the fluidity of pigment particles. Specifically reflected in the following aspects:


1. In order to improve the glossiness and leveling effect, the actual glossiness mainly depends on the light scattering of the coating surface (that is, a certain flatness). Of course, in order to judge whether the test instrument is smooth enough, not only the number and shape of primary particles, but also their combination should be considered. When the particle size is less than 1 / 2 of the incident light (the value is uncertain), the particle size should be less than 1 / 2 of the incident light. Similarly, the covering power provided by scattering will not increase (carbon black mainly depends on absorbing light, organic pigment). Note: the incident light refers to the range of visible light, it is not easy to say that the leveling property is good; but attention should be paid to reduce the original particle number, which is to reduce the structural viscosity, but the increase of specific surface area will reduce the amount of free resin, and it is not easy to say whether there is a balance point, but the leveling property of general powder coatings is not the finer the better.

2. Prevent floating color and flowering.

3. In order to improve the coloring force, the higher the coloring force, the better.

4. Reduce the viscosity and increase the amount of pigment.

5. But the finer the particles are, the higher the surface energy is, and the higher the adsorption strength is. However, the high adsorption strength of dispersant will have a negative impact on the film performance.

6. In fact, the reasons for increasing storage stability are similar to the above. Once the stability of dispersant is not enough, the storage stability will be worse (of course, from your photos, this is not a problem).

7. Increase color rendering, increase color saturation, increase transparency (organic pigment) or hiding power (inorganic pigment).


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