White and interference-color matte flaky cored pigment and preparation method thereof

Abstract

The invention discloses a white and interference-color matte flaky core-covered pigment and a preparation method thereof and relates to the field of pearlescent pigments. A base material with the grain diameter D50<=5 micrometers is coated with white metallic oxide to form a coating layer. According to the method, the base material and water are mixed to form suspension liquid, a crystal grain modifier is put in the suspension liquid, a metallic oxide crystal type transforming agent is added into the suspension liquid, the pH value is regulated, a saline solution is added dropwise into the suspension liquid, the pH value of the suspension liquid is kept stable at the same time, stirring is continued after adding is over, the pH value of the solution is regulated, an anti-aggregation agent is added, and suction filtration, drying, calcining and cooling are performed on the solution after adding is over. Compared with the prior art, the pigment prepared through the method is small in grain diameter, very fine and smooth, quite obvious in skin effect, high in covering force, good in ultraviolet absorption effect, low in luster, remarkable in matte effect and capable of being widely applied to cosmetics, sun cream, pigment toning and other industries.

Description

technical field [0001] The invention relates to the technical field of pearlescent pigments, in particular to a white and interference color matte flaky nucleated pigment and a preparation method thereof. Background technique [0002] Pearlescent pigments can reproduce the elegant luster and color of natural pearls, shells, metals, swimming fish and butterflies. It relies on the refraction, reflection and projection of light to create hue and luster, and can give deep layers to plastic products and leather. sense and special luster. The reason why pearlescent pigments give products a pearly luster is that they use natural muscovite or artificially synthesized mica or glass flakes as the core, and use a special chemical process to coat one or more layers of metal oxide on the surface of the core to form a powder. body pigment, so that it has a plane sandwich body very similar in structure to natural pearls, it can decompose composite light into various monochromatic lights l...

AI Technical Summary

Problems solved by technology

[0004] High gloss and high saturated color concentration have always been the goals pursued by the pearlescent pigment industry, but pearlescent pigments with low gloss, high hiding power and high whiteness have not been effectively developed and utilized; this is because the type The characteristics and properties of pearlescent pigments are that one or several kinds of high refractive index inorganic metal oxides or hydrates or salts must be coated on ultrafine particle size substrates such as natural mica, synthetic mica or glass, etc., in order to expect Obtain ultra-white and high-covering low-gloss pearlescent pigments; and ultra-fine particle size pigments have low yield, high energy consumption, long production cycle, easy to be polluted, and difficult to grind, and the particle size distribution of the substrate obtained by grinding is not uniform; Secondly, the smaller the particle size of the pigment per unit weight, the more the number of particles, the more the number of edges, and the lower the gloss. When the particle size of the pearlescent pigment is less than 0.15-5 microns, the luster of the prepared pearlescent pigment The degree of gloss is very low, and its gloss is in the matte range, so the production and researchers of pearlescent pigments believe that there is no need for research; again, because the substrate used is in the form of flakes, mainly phyllosilicate substances, obtained by wet grinding The high aspect ratio (diameter / thickness) substrate, its thickness is basically about 100 nanometers, which is close to or one-dimensional nanoscale. As we all know, due to the quantum effect of ultra-high specific surface area of ​​nanomaterials, when drying and calcination, It is very easy to agglomerate to form irregular agglomerated particles with high bonding strength, so that it loses the required flake-like pigment properties

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