Particle size pigment dispersion testing

Testing. Various test methods are provided by ASTM (16). These iaclude pigment tests of importance such as chemical analysis, presence of oversize particles, oil absorption, particle size distribution, degree of dispersion, presence of soluble components, etc. Numerous tests are also given by ASTM for the properties of filled and unfilled polymers. These iaclude, for example, such properties as impact resistance, stiffness, viscosity, tear resistance, hardness, color, and electrical resistivity. 

Figure 9.7 shows how the reflectance depends on the amount of titania pigment added to an acrylic coating. Two different dispersants were used. As reference, a commonly used dispersant, Dispex N-40, an aqueous sodium salt solution of an acrylic copolymer, was tested in the study. The other dispersant was Bindzil CC 151 HS, an aqueous glycerolpropylsilyl-modified silica dispersion with a particle size of about 5 nm... 

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