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Highly anti-corrosive thin platelet-like metal pigments, preparing method of the same, and colored interference pigments having metallic luster based on the same

A technology of metallic pigments and metallic luster, applied in the direction of fibrous fillers, etc., can solve the problems of irregular reflection, insufficient particle dispersion, deterioration, etc., and achieve good corrosion resistance

Inactive Publication Date: 2007-12-12
MERCK PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these colored interference pigments, the interference color layer is applied directly by the so-called sol-gel method avoiding aqueous processing, since flake-like metal substrates have the disadvantage that they can easily react with water and be easily oxidized
[0005] However, in these conventional methods, there are disadvantages that expensive raw materials must be used, or that the inherent smoothness of the surface of the flake-shaped metal substrate is not maintained but deteriorated, or that the dispersibility of the particles is insufficient, resulting in poor Regular reflections, which do not take full advantage of reflected light on the surface of the foil
According to this corrosion-resistant metallic pigment, it is possible to take a method in which hydrated metal obtained by neutralization hydrolysis using a water-soluble metal salt and a base or by thermal hydrolysis of a water-soluble metal salt in an aqueous system is oxidized coated, filtered, dried and, if desired, calcined (hereinafter defined generally as the "wet-process method" throughout the specification including the claims); however, the metallic pigments are still Does not provide adequate corrosion resistance under alkaline conditions

Method used

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  • Highly anti-corrosive thin platelet-like metal pigments, preparing method of the same, and colored interference pigments having metallic luster based on the same

Examples

Experimental program
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Effect test

Embodiment 1

[0145] Highly corrosion-resistant flake metallic pigments (SnO 2 / [SiO 2 / Al(P)]) preparation

[0146] With 100 grams of its layer through anticorrosion-treated flake metal substrate (according to the [SiO 2 / Al(P)], specific surface area: 3.01m 2 / g) suspended in 2 liters of water. The suspension was heated to 75°C with stirring. 372 ml of SnCl 4 5H 2 O solution (concentration 50 g / l) was added dropwise to the suspension while maintaining the pH at 1.8 with 32% by weight aqueous sodium hydroxide solution. Afterwards, the solid part filtered from this suspension was washed and dried to obtain highly corrosion-resistant flaky metallic pigments (SnO 2 / [SiO 2 / Al(P)]). With the per unit surface area (m) of the sheet metal substrate (Al) 2 ) of tin oxide (SnO 2 ), the amount of the coating layer of hydrated tin oxide is an amount corresponding to 0.036 g.

Embodiment 2

[0154] Embodiment 2: have the color interference pigment (Fe 2 o 3 / SnO 2 / [SiO 2 / Al(P)]) preparation

[0155] 50 grams of highly corrosion-resistant flake metal pigments (SnO 2 / [SiO 2 / Al(P)]) suspended in one liter (litter) of water. The suspension was heated to 75°C with stirring. Thereafter, the pH was adjusted to 3.0 using aqueous hydrochloric acid / sodium hydroxide solution. In addition, drop 1816 grams of FeCl 3 (III) Aqueous solution (concentration: 30 g / l) until the desired hue is obtained while maintaining the pH at 3.0 using aqueous sodium hydroxide solution. The mixture was further washed / filtered, dried, and calcined at 350° C. for 30 minutes to obtain a color interference pigment with a reddish metallic luster.

Embodiment 3

[0156] Embodiment 3: the color interference pigment (TiO with metallic luster) 2 / SnO 2 / [SiO 2 / Al(P)]) preparation

[0157] 50 grams of highly corrosion-resistant flake metal pigments (SnO 2 / [SiO 2 / Al(P)]) suspended in one liter of water. The suspension was heated to 75°C with stirring. Afterwards, the pH was adjusted to 1.8 using aqueous hydrochloric acid / sodium hydroxide solution. Then, titanium tetrachloride solution (TiCl 4 , Concentration: 448 g / L) was added dropwise to this suspension until the desired hue was obtained, while maintaining the pH at 1.8 using 32 wt% aqueous sodium hydroxide solution to complete the reaction in a green hue. The mixture was further filtered to remove the solid part, washed, dried and calcined (30 minutes at 350° C.) to obtain a metallic luster colored interference pigment (TiO 2 / SnO 2 / [SiO 2 / Al(P)]).

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Abstract

The present invention provides a highly anti-corrosive thin platelet-like metal pigments which have high corrosion resistance and good dispersibility even in a strong alkaline atmosphere thereby maintaining the inherent metallic luster of thin platelet-like metal substrates. The highly anti-corrosive thin platelet-like metal pigments in which the surface of thin platelet-like metal substrates are treated with phosphoric acid compounds and / or boric acid compounds, and further coated with a layer containing hydrated tin oxide.

Description

technical field [0001] The present invention relates to novel highly corrosion-resistant thin platelet-like metallic pigments, a process for their preparation and metallically lustrous colored interference pigments based on the pigments, as well as the use of the pigments. Background technique [0002] Commercially available pearlescent pigments are known, which use a flaky mica substrate coated with a highly refractive metal oxide (hereinafter referred to as "interference color layer") such as titanium oxide to display s color. However, since mica is translucent, its reflectance is low; therefore, the expression of interference colors by interference is not sufficiently realized. Therefore, there have been colored interference pigments in which an opaque and highly optically reflective metal is used as a flake-shaped substrate, and an interference color layer (such as titanium oxide, etc.) is coated on the surface thereof (see, for example, Patent Literature 1). In these...

Claims

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Application Information

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IPC IPC(8): C09C1/00C09C1/64C09C1/62C09C1/66
Inventor 李邦银中村信明新田胜久高桥则夫
Owner MERCK PATENT GMBH
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