Effect of Fineness of Coating tinter on Printing

Paint color paste is a colored paste made of organic or inorganic pigments that are dispersed, emulsified, and ground into extremely fine particles for printing processing plants to directly use for coloring. The particle fineness of the pigment has naturally become an important indicator of the quality of the paint color paste.

According to the spectral reflection wavelength reference, the best particle size of the pigment is generally 300-500 nm, and its visible wavelength is the best reflectance. Therefore, we generally process paint colorants and grind their particles to a fineness of 300-500 nm. Due to the influence of cost and processing equipment during the processing of color paste, most color paste processing manufacturers may not meet such fineness requirements. There are also some printing processes that require the particle size of the color paste to be below 100 nm due to special requirements (such as digital ink, etc.).

Leather coating and other processing do not have high requirements on the fineness of color paste particles, and the fineness of color paste particles is also in the range of 1,000 to 15,000 nm. Therefore, the fineness requirements of the color paste particles should be selected according to the objects they are processed. The fineness of particles is one of the indicators of the quality of paint color paste.

To analyze or test the particle fineness of paint color paste, the following methods can be used:

1) Visually detect the particle distribution and particle size per unit volume through a particle size analyzer. However, due to the accuracy of the test and the amount of color paste tested, it can only be used as a reference data for fineness. The impurity content in the color paste should be detected by filtering;

2) Through the vacuum filtration Tester, test the particle size distribution and sieve rate per unit volume. Can check the number of large particles and impurity content in the color paste;

3) Through free diffusion detection, the capillary effect, purity and dispersion performance of the color paste can be detected;

4) The covering rate of the color paste can be analyzed by comparing the coloring rate of 5% concentration printing and light color 0.02% of two or more different manufacturers of color pastes (some color pastes have dark colors in dark colors and light colors in light colors, indicating particles. It is thicker, and the color is consistent in the dark color, and when the light color is dark, it means that the particles are finer, and the lighter the color, the better the problem). Combining several methods, we can compare the advantages and disadvantages of which paint color paste in terms of particle fineness and dispersion performance.