Synthetic mica based silver pearlescent pigment as well as preparation method and application thereof

A technology of pearlescent pigments and synthetic mica, which is applied in the direction of pigment preparation, inorganic pigment treatment, chemical instruments and methods, etc. It can solve the problems of unfavorable pearlescent system coating product quality, etc., and achieve the improvement of gloss, hiding power and hiding power Effect

Active Publication Date: 2018-12-21
FUJIAN KUNCAI MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The existing theory believes that the chromaticity and brightness can be effectively enhanced by adopting the structure of alternate coating of high and low refractive index oxides. However, due to the different hydrolysis conditions of multi-layer oxides, the coating thickness of each layer is also different. The transformation of the conditions between the coating layers will inevitably have adverse effects on the coating of the pearlescent system or the quality of the product

Method used

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  • Synthetic mica based silver pearlescent pigment as well as preparation method and application thereof

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preparation example Construction

[0045] The preparation method of the described silvery pearlescent pigment based on synthetic mica, comprises the following steps:

[0046] Add water to synthetic mica to make a slurry, add soluble barium salt and soluble sulfate corresponding to barium sulfate to the slurry, coat the barium sulfate layer, and coat the first tin oxide-doped titanium dioxide on the barium sulfate layer in turn layer, a silicon dioxide layer doped with titanium dioxide and a second titanium dioxide layer doped with tin oxide, filtered, washed, dried and calcined to obtain the silver pearlescent pigment.

[0047] Preferably, the calcination temperature is 700-850°C, more preferably 760-800°C.

[0048] Preferably, the coating method of the first tin oxide-doped titanium dioxide layer and the second tin oxide-doped titanium dioxide layer specifically includes the following steps: after mixing tin tetrachloride and titanium tetrachloride solution, Doping by directly hydrolyzing the coating; more pr...

Embodiment 1

[0054] The silver pearlescent pigment provided by the application has a particle size of 20-100 μm (the average particle size is 50 μm) and a fluorphlogopite mica substrate is coated with a 5nm barium sulfate layer, a 30nm first tin oxide-doped titanium dioxide layer, and a 40nm A titania-doped silica layer and a 20 nm second tin oxide-doped titania layer.

Embodiment 2

[0056] The silver pearlescent pigment provided by the application has a particle size of 10-60 μm (average particle size is 27 μm) and a fluorphlogopite mica substrate is coated with a 10nm barium sulfate layer, a 200nm first tin oxide-doped titanium dioxide layer, and a 200nm A titania-doped silica layer and a 180 nm second tin oxide-doped titania layer.

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Abstract

The invention provides a synthetic mica based silver pearlescent pigment as well as preparation method and application thereof. A mica substrate is externally coated with a barium sulfate layer, a first tin oxide doped titanium dioxide layer, a titanium dioxide doped silicon dioxide layer and a second tin oxide doped titanium dioxide layer in turn. A structure of alternate coating by high- and low-refractive indexes (tin-titanium oxide / titanium-silicon oxide / tin-titanium oxide) is adopted, but the same hydrolysis conditions are adopted in the coating process of a plurality of oxide layers; thus, the technology is stabilized, and the cost is remarkably saved. By adopting titanium dioxide doped silicon dioxide on the low-refractive index layer to form a semitransparent middle interlayer, thepigment gloss is improved while the covering power is noticeably enhanced; the base material is coated by a layer of semitransparent barium sulfate, and unexpectedly, the covering power is further enhanced; therefore, the silver pearlescent pigment has the advantages of high gloss, strong covering power and the like.

Description

technical field [0001] The invention relates to the technical field of daily chemical industry, in particular to a silver pearlescent pigment based on synthetic mica and a preparation method thereof. Background technique [0002] As a new type of pigment, pearlescent pigments are widely used in traditional organic pigments, inorganic pigments, metal pigments (aluminum silver paste, copper gold powder, etc.) Researchers at home and abroad use a variety of technical means to improve the chroma, brightness, hiding power and other indicators of pearlescent pigments. The structure of pearlescent pigments is also becoming more and more complex, from the original single coating layer to multiple coating layers, and the coating of a single metal oxide becomes one or more combinations. For example, the patent document whose publication number is CN1217734A describes the effect pigments coated with high refractive index metal / low refractive index oxide / high refractive metal structure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/42C09C3/06C09D7/62C08K9/10C08K3/34C08L23/12
CPCC08K3/34C08K9/10C09C1/0015C09C2200/1033C09C2200/205C09C2200/408C09C2220/106C09D7/62C08L23/12
Inventor 费明邱玉琴丁家国谢秉昆
Owner FUJIAN KUNCAI MATERIAL TECH
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