High-purity red pigment with pearlescent effect, and preparation method thereof

Abstract

The invention discloses a high-purity red pigment with a pearlescent effect. The red pigment comprises a mica substrate, the outer layer of the mica substrate is sequentially coated with an iron-titanium layer, a silicon layer, an iron layer and a protective layer, the iron-titanium layer is a ferric oxide and titanium dioxide mixed doped layer, the silicon layer is a silica layer, the iron layeris a ferric oxide layer doped with tin oxide, calcium oxide and magnesium oxide, the iron layer 4 is an iron solution doped with 0.1-1% of tin chloride, 0.1-1%calcium chloride and 0.1-1%magnesium chloride, the protective layer is aluminum trichloride or zirconium oxychloride, and a molar ratio of the ferric oxide to the titanium dioxide in the iron-titanium layer is 2:1. The invention also discloses a preparation method of the high-purity red pigment with the pearlescent effect. The preparation method has the advantages of simple production process, strong operability, stable scale productionand low cost, and the red pigment keeps the consistent tone with the color accepted by the public, and the purity and the brightness of the pigment are greatly improved.

Description

technical field [0001] The invention relates to the technical field of pigments, in particular to a high-purity red pearlescent effect pigment and a preparation method thereof. Background technique [0002] As a new type of effect pigment, pearlescent pigment is widely used in various fields. Because of its environmental protection and safety, it has a tendency to gradually replace organic pigments, inorganic pigments, and metallic pigments. Because domestic and foreign researchers and pearlescent pigment manufacturers are constantly adopting various advanced technical means to improve the hue purity, color saturation and hiding power of pearlescent effect pigments, the structure of pigments is becoming more and more complex. The cladding structure also changes from a single-layer cladding to a multi-layer cladding, and a single metal oxide cladding becomes a combination of two or more metal oxide doped claddings. Because of human yearning and pursuit of beautiful colors, r...

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Problems solved by technology

[0003] Natural mica or alumina flakes, glass flakes or ferric chloride flakes are used as the base material. Natural mica is doped with iron oxide due to its own geological structure, which affects the purity of the flakes, thus affecting the appearance and hue of the final pigment product. purity; or due to the harsh preparation conditions and high cost of α-alumina flakes, it is difficult to industrialize; or because the production process of the base material in glass flakes determines that the diameter-thickness ratio of the flakes is difficult to be uniform, thus affecting The purity and saturation of the product hue seriously affect the quality of the product

[0004] In recent years, research on the preparation of high-purity effect pigments by liquid-phase chemical deposition method has been on the rise for the use of the advantages of artificially synthesized mica substrates. The color saturation of pigments has its own advantages and disadvantages, but it is necessary to achieve high-purity and high-saturation effect pigments. There are difficulties

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