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
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  • Claims
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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

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

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Example Embodiment

[0144] Example 1

[0145] Highly corrosion resistant flake metallic pigment (SnO 2 / [SiO 2 / Al(P)]) Preparation

[0146] 100 grams of the flaky metal substrate with anti-corrosion treatment (according to JP, A, 2003-41150 paragraph [0061] Example 4-b obtained [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. Add 372 ml of SnCl 4 5H 2 An O solution (concentration of 50 g / l) was dropped into the suspension while maintaining the pH at 1.8 using a 32 wt% aqueous sodium hydroxide solution. Afterwards, the solid part filtered from the suspension was washed and dried to obtain highly corrosion-resistant flake-like metallic pigments (SnO 2 / [SiO 2 / Al(P)]). The surface area per unit (m 2 ) Tin oxide (SnO 2 ), the amount of the coating of hydrated tin oxide is equivalent to 0.036g.

Example Embodiment

[0154] Example 2: Reddish colored interference pigment with metallic luster (Fe 2 O 3 / SnO 2 / [SiO 2 / Al(P)]) Preparation

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

Example Embodiment

[0156] Example 3: Color interference pigment with metallic luster (TiO 2 / SnO 2 / [SiO 2 / Al(P)]) Preparation

[0157] 50 grams of the highly corrosion-resistant flake-like metallic pigment (SnO 2 / [SiO 2 / Al(P)]) suspended in one liter of water. The suspension was heated to 75°C with stirring. After that, the pH value was adjusted to 1.8 using hydrochloric acid / sodium hydroxide aqueous solution. Then, the titanium tetrachloride solution (TiCl 4 , Concentration: 448 g / L) was dropped into the suspension until the desired hue was obtained, and at the same time, a 32wt% aqueous sodium hydroxide solution was used to maintain the pH at 1.8 to complete the reaction in a green hue. The mixture was further filtered to remove the solid part, washed, dried and calcined (at 350°C for 30 minutes) to obtain a slightly greenish 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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