Method Of Judging Dispersibility Of Organic Pigments

When using organic pigment, if the dispersibility of organic pigment is good, it can be evenly dispersed in the medium used, so how to judge the dispersibility of organic pigment is good or bad, we first need to know the factors affecting the dispersibility of organic pigment are the fineness of the pigment particles, the aggregation of the dispersibility of the state of the particles, the surface state of the particles and the medium used for coloring.
There are two ways to judge the dispersibility of organic pigments, namely, direct method and indirect method to evaluate the dispersibility of organic pigments, the following pigment yellow 74 manufacturer for you to briefly introduce these two methods.

Direct Method
Direct methods can be divided into fineness method, coloring power growth curve method, Kurkent electronic method, ion turntable particle determination method and light deposition method, etc., of which the two most commonly used methods are fineness method and coloring power growth curve method. The fineness method is commonly used in the production of ink industry to observe the relationship between the grinding time and the fineness of dispersion of different organic pigments. And when determining the trend of increasing coloring power of organic pigments with the increase of grinding time, the coloring power growth curve method is commonly used to determine the dispersibility of organic pigments. When testing this method, the pigment needs to be fully ground and then the sample, and then the grinding time of different organic pigments will be compared with its coloring power to draw the curve between the grinding time and the coloring power, according to the trend of this curve can be derived from the dispersion performance of the organic pigment.

Indirect Method
In predicting whether the particle size of organic pigments is relevant to certain pigment properties of organic pigments, an indirect method is often used to detect the dispersibility of organic pigments. This method firstly requires the calculation of the time used by the samples of organic pigments when using different grinding methods, and then the X-ray powder diffraction method through the centrifugal rotary disk method to determine the size and distribution of its particle size of the samples, and then to detect the dispersibility of the organic pigment specimens. Dispersion. If the fluidity or viscosity is determined, according to the law that the fluidity changes with the increase of the dispersion level of the organic pigment, especially when the concentration of the pigment is increased, the viscosity value has an obvious dependence on the particle size. Experiments have shown that for phthalocyanine blue and magenta 4B, the viscosity increases significantly with decreasing particle size when the concentration reaches 20%-25%. Therefore, under the conditions that have been determined to be related to the two, by determining the size of the viscosity value, you can evaluate the level of sample dispersion or dispersion performance.