Coated pigment

a technology of coating pigment and pigment, applied in the direction of coating, transportation and packaging, chemical coating, etc., can solve the problems of blackening or hydrogen gas of aluminum pigment, and achieve the effect of reducing the number of aggregates (few aggregates, aggregated particles)

Inactive Publication Date: 2020-04-30
TOYO ALUMINIUM KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0018]With the present invention, it is possible to provide a coated pigment that is composed of a composite particle comprising a silicon compound coated on the surface of a metal particle, and that can be dispersed with relatively few aggregates.
[0019]In particular, in the present invention the composite particle can be produced and maintained in a highly dispersed state because the composite particle is manufactured by subjecting a metal particle to a coating process under stirring under specific conditions. As a result, aggregates (aggregated particles) constituted by adhesion of composite particles with each other can be greatly reduced. More specifically, it is possible to achieve a low value of not more than 35% on the number basis as the proportion of aggregates formed by adhesion of at least four of the composite particles with each other. By thus effectively reducing the number of aggregates of many composite particles, it is possible to provide a pigment with a strong hiding force per unit mass.
[0020]Thus, the highly dispersible coated pigment of the present invention can be used in a wide range of applications including various paints, inks, writing implements, electronic materials and parts, automobile parts, household electrical goods, cosmetics and the like for example.

Problems solved by technology

However, taking the example of paints using aluminum pigments, which are especially common as metal pigments, the problem in the case of water-based paints is that the aluminum pigments may turn black or emit hydrogen gas when they react with water in the paint.

Method used

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  • Coated pigment

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0137]First, commercial aluminum pigment flakes (product name “7670NS”, manufactured by Toyo Aluminum K.K., average particle diameter 15 μm, aspect ratio 68) in the amount of 100 g as solids were added to 1,000 g of isopropyl alcohol, and thoroughly mixed to prepare an aluminum slurry. At this point the aluminum slurry had a viscosity of about 10 mPa·s (25° C.), and a liquid density of about 830 kg / m3 (25° C.). This aluminum slurry was placed in a roughly 4.5 L round-bottomed flask, and heated to 50° C. under stirring with a three-bladed propeller stirrer (Tokyo Rikakikai Co., Ltd., marine blade) so that the stirring Reynolds number was 19,000. In the following steps, stirring was also performed so as to maintain the same stirring Reynolds number.

[0138]Next, 0.5 g of metal molybdenum powder was added bit by bit to 10 g of hydrogen peroxide water containing 30% hydrogen peroxide, and reacted to prepare a solution. The resulting aqueous solution containing molybdenum was added gradual...

example 2

[0142]A coated aluminum pigment was obtained by the same operations as in Example 1 except that the stirring Re number was 14,000.

example 3

[0143]A coated aluminum pigment was obtained by the same operations as in Example 1 except that the stirring Re number was 10,005.

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PUM

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Abstract

A main object of the present invention to provide a coated pigment that is composed of a composite particle comprising a silicon compound coated on the surface of a metal particle, and that can be dispersed with relatively few aggregates.
The present invention relates to a coated pigment comprising a composite particle containing a metal particle and one or two or more coating layers on the surface of the metal particle, wherein (1) at least one of the coating layers is a silicon compound-containing layer, and (2) the proportion of aggregates formed by adhesion of at least four of the composite particles with each other is not more than 35% by number.

Description

TECHNICAL FIELD[0001]The present invention relates to a novel coated pigment. More specifically, it relates to a pigment that can provide superior hiding power and the like because the individual particles are highly dispersed.BACKGROUND ART[0002]Attention in the paint industry has recently focused on low-emission paints in an effort to reduce environmental impacts. Low-emission paints are paints in which the content of hydrocarbons in the solvent or the like is either 0% or very low, such as water-based paints, solvent-free paints (powder paints) and the like. As in the case of conventional organic solvent-based paints, the use of metal pigments is essential in such low-emission paints because a metallic appearance is required for a broad range of applications. However, taking the example of paints using aluminum pigments, which are especially common as metal pigments, the problem in the case of water-based paints is that the aluminum pigments may turn black or emit hydrogen gas wh...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09C1/64C08L57/00C08L87/00C08K9/02C08K9/08C08K3/08C08K3/10C08K3/22C09D5/02B22F1/14B22F1/16
CPCC08K3/08C08K3/22C09D5/028C08K3/10C08L87/00C01P2004/61C08K9/08C01P2004/62C08L57/00C01P2004/03C08K9/02C09C1/648C09C1/62C09D7/62C09D7/63C08K2003/0812C08K5/5415C08K3/36C09D5/28C09D5/29C08K2003/2227C09C1/642C01P2006/62C23C18/122C23C18/1216C22C1/0416B22F1/14B22F1/16C09C1/64C09C3/12C08K9/06C09D17/006
Inventor HAYASHI, FUTASATO, MASAMIKAWASHIMA, KATSURA
Owner TOYO ALUMINIUM KK
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