High brightness and high color saturation super flash silver white pearlescent pigment and preparation method thereof

Abstract

The invention belongs to the technical field of pearlescent pigment, and relates to high-brightness and high-color-saturation super-flash type silvery white pearlescent pigment and a preparation method thereof. The preparation method comprises the following steps: A, performing surface sensitization, namely, putting mica powder into a hydrochloric acid mixing liquid dissolved with stannous chloride for surface sensitization, filtering and washing; B, performing silver plating, namely, stirring the solution obtained in the steps A while dropwise adding a silver-ammonia solution and a sodium hydroxide solution at the same time; C, dispersing, namely, stirring and heating to obtain silver-plating mica powder pulp, and adding an anionic surfactant into the pulp; D, enveloping, namely, under a constant-temperature stirring condition, dropwise adding a titanium tetrachloride solution and a sodium hydroxide solution at the same time till a water sample is silvery white; E, calcining, namely, calcining for 1-3 hours in the presence of air atmosphere at 200-600 DEG C, thereby obtaining the silvery white pearlescent pigment. The high-brightness and high-color-saturation super-flash type silvery white pearlescent pigment has the advantages of being low in cost, high in security, convenient for realizing industrial production, and the like, and is applicable to industrial large-scale production.

Description

technical field [0001] The invention belongs to the technical field of pearlescent pigments, and relates to a super flash silver-white pearlescent pigment with high brightness and high color saturation and a preparation method thereof. Background technique [0002] Pearlescent pigment is a kind of decorative pigment with pearl-like luster. It uses mica, flake glass, flake alumina and other flake substrates as nuclei, and deposits one or more layers on its surface using a special preparation process. High refractive index metal oxides. As a result, under the action of light reflection and refraction, a strong three-dimensional pearlescent effect is produced. It has excellent properties such as non-toxicity, strong decorability, and good chemical stability. It is widely used in the fields of cosmetics, leather, plastics, and coatings. [0003] However, natural mica, as a common base material for pearlescent pigments, also has the following disadvantages: (1) natural mica itse...

AI Technical Summary

Problems solved by technology

[0003] However, natural mica, as a common base material for pearlescent pigments, also has the following disadvantages: (1) natural mica itself contains some chromogenic ions (such as iron, chromium, etc.), and its existence causes the color of the product to be reduced in the subsequent roasting process. purity

(2) During the wet grinding process, the mica flakes will be damaged by mechanical shear force, which will cause edge gradient and surface roughening on the surface of the flakes, which will cause light scattering and diffuse reflection, and reduce the gloss of pigment products

In the Chinese patent ZL201420559497.6, the method of chemical silver plating is adopted to plate silver on the surface of synthetic mica or glass flakes, so as to obtain super flash silver pearlescent pigments; however, the coating rate of silver in this preparation process is relatively large, and the cost is relatively high

U.S. Patent No. 2885366 discloses that the aluminum surface is passivated by using silicon dioxide to coat the aluminum sheet, thereby continuing to coat the metal oxide; the process is cumbersome to operate, and hydrogen gas is generated during the reaction process, which is less safe and unfavorable for industrialization Production