At present, the domestic research work mainly focuses on the exploration of liquid phase coating process, affirming and improving various process elements and parameters that affect the quality of Mica glitter of metallic glitter manufacturers, in order to find out how to improve the whiteness, color effect and pearlescent luster of Mica Pearlescent Pigment. The factors that affect the quality of Mica pearlescent pigments are summarized as follows :(1) The particle morphology and diameter-thickness ratio of matrix Mica powder is the carrier for stacking and coating nano-titanium dioxide particle films. The particle morphology and diameter-thickness ratio of matrix Mica powder have great influence on the quality of Mica Pearlescent Pigment. The diameter-to-thickness ratio of the matrix Mica powder commonly used to prepare Mica glitter is required to be greater than 50. (2) Inclusions in mica flakes the chemical composition of natural sericite raw materials is complex, especially the colored metal ion oxides such as iron, manganese, chromium and vanadium, which not only directly affect the original whiteness and luster of mica flakes, it also affects the whiteness and luster of the Pearlescent Pigment after the chemical accumulation reaction coating. Especially when making snow white pearlescent pigment with high whiteness and luster, this effect becomes more and more prominent, which is manifested by low whiteness, poor luster, gray, yellow or black color. If these mica sheets with high impurity content are used to make magic colors and colored pearlescent glitter, the color deviation of the pigments and the color drop will be shown. (3) The process elements of the coating process are related to the chemical liquid phase stacking process, the technological elements of the accumulation coating process are closely related to the hydrolysis reaction of titanium salt, the accumulation of hydrolysis products on Mica matrix to form nano-particle coating and the growth of the film. In particular, the factors such as pH value, temperature, stirring speed and agent dropping acceleration have great influence. In the experiment, it is to affirm the parameters of these elements to regulate and control the process of the above-mentioned technological links. The study indicated that no matter what type of Mica Pearlescent Pigment is manufactured, the reaction is requested to stop in an environment with relatively constant reaction conditions such as pH value and temperature, the hydrolysis rate of titanium salt and the nucleation and growth rate of hydrated titanium dioxide particles are relatively stable and harmonious with each other, so as to obtain an average lubricated and dense titanium dioxide particle coating layer. The rough and uneven surface of the pigment particles will diffuse light in different directions. The result is that the reflected light interferes with each other and the gloss is reduced. As long as the smooth surface of the object can achieve a single direction of light reflection, parallel reflected light to enhance the gloss. (4) The particle size distribution of matrix Mica powder the particle size distribution of mica powder also has a great influence on the quality of Mica Pearlescent Pigment of Pearlescent Pigment brand. The particle size distribution of matrix Mica powder is wide, the particle size of mica sheets is uneven, and mica sheets with small particle size are easy to adhere to large sheets to form relatively more laminations, which can strengthen the scattering of light and reduce the luster, and lead to Mica appearance brightness, flatness is not ideal. In addition, Mica glitter prepared from Mica powder with mixed particle sizes have uneven optical effects such as bright spots formed by large particles and lack of luster formed by small particles in the application of pigments, it also reduces its pearlescent luster; For the intervention color Mica Pearlescent Pigment, the specific surface product of Mica substrates with different particle sizes is quite different, so that in the process of stacking titanium dioxide, under the same reaction conditions, on the mica sheet, a titanium dioxide layer with uneven thickness will be produced, so uniform color interference color brilliance cannot be obtained. The research shows that the narrower the particle size distribution of matrix Mica powder, the higher the average particle size, and the stronger the luster of the obtained pigment.
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