Material grinding is an important part of ink production, and the level of grinding quality can be expressed by the degree of dispersion of the material. The different particle sizes of the zirconia beads affect the grinding effect and efficiency of the material. In order to better use the sander in ink dispersion and grinding, this paper analyzes the effect of different diameters of zirconia beads on solvent and water-based ink dispersion and grinding. The research results show that due to the larger specific gravity of the medium, the grinding effect of the material when zirconia beads is used as the grinding medium is better than that of glass beads and alumina beads; the smaller the diameter of the same type of zirconia beads, the smaller the pigment particle size, the greater the grinding effect good;
In the production of ink, it is necessary to pre-disperse materials with zirconia beads, and then use grinding equipment to grind until the grinding fineness meets the technological requirements. Pigment grinding is an important part of the solvent and water-based ink production process. The grinding equipment relies on grinding media such as balls and zirconia beads to impact, friction and shear the materials through different movements, thereby crushing and dispersing the materials.
Three types of zirconia beads with diameters of 1.0 to 1.2 mm, 1.6 to 1.8 mm, and 2.2 to 2.4 mm are selected as the grinding media. Under the same other grinding conditions, the horizontal The same amount of pigment is ground for 90 minutes with a type sander, and the particle size of the ground pigment is measured by a laser particle size analyzer. Analyze the influence of different types of zirconia beads on the ink grinding effect.
(1) When using small-diameter zirconia beads as the grinding medium, the pigment particle size should be small and the grinding effect will be good. When using zirconia beads with a diameter of 1.0 to 1.2 mm as the grinding medium, 95% of the ink particle size is less than 1 μm; when using zirconia beads with a diameter of 1.6 to 1.8 mm as the grinding medium, ink 95 % Particle size is less than 1. 52 μm; when zirconia beads with a diameter of 2.2 to 2.4 mm are used as the grinding medium, 95% of the ink particle size is less than 1.6 μm. At the same time, the grinding effect of zirconia beads with diameters of 1.6 to 1.8 mm and 2.2 to 2.4 mm is similar.
(2) Zirconia beads with small diameter collide with each other in the barrel of the sander and have a higher chance of shearing. The smaller the diameter of the zirconia beads, the higher the number of collisions under the same volume and volume; the larger the active area of the zirconia beads during the grinding process, the greater the shearing force on the pigment dispersion, the narrower the ink particle size distribution, and the greater the particle size of the pigment after grinding The overall size is smaller and the number of small particle size pigments is larger, and the grinding effect and efficiency are high. Due to the small specific surface area and small action area, the dispersion and shearing force on the pigment is small, and the ink particle size distribution is wider and the number of larger particle sizes is larger.
