JPH04228503A - Metal-coated powder and its production - Google Patents

Abstract

PURPOSE:To prevent the contamination of a plating soln. and to produce a metal-coated powder while applying various resins. CONSTITUTION:Inorg. particles are deposited and fixed on a resin powder, and a layer of metal or an alloy is formed on the particle to produce a metal- coated powder. As a typical process, inorg. particles are deposited and fixed on a resin powder and the particles are sensitized and then activated, or the sensitization and activation are simultaneously performed and then the layer of the metal or alloy is formed by electroless plating. Since the inorg. particles are fixed on the resin powder, the wettability of the powder with water is improved, and the particles are easily electroless-plated. Consequently, the plating soln. is not contaminated as in the conventional process in which the resin is etched, the layer of the metal or alloy is stably formed, and various resins can be coated with the layer.

Description

[Detailed description of the invention]

0001

[Industrial Application Fields] The present invention can be used for paints, adhesives, powder metallurgy, injection molding, electromagnetic shielding, dispersion reinforcement materials such as inkstones, powder coatings, cosmetics, etc. The present invention relates to a metal-coated powder suitable for this purpose and a method for producing the same.

0002

2. Description of the Related Art A conventional metal-coated powder is one in which a metal or alloy layer is formed on a resin powder whose surface has been roughened. In addition, as a manufacturing method, the surface of the resin powder is etched using chromic acid etc. to make it hydrophilic and porous, and the surface is subjected to sensitization treatment and activation treatment.
Thereafter, a metal coated powder was obtained by forming a metal or alloy layer by electroless plating.

0003

[Problems to be Solved by the Invention] However, these methods have limitations regarding the quality of the resin material. That is, there are a limited number of resins whose surfaces can be made hydrophilic and porous by etching. Therefore, it is not possible to select a resin depending on the purpose. Furthermore, when the resin surface is made hydrophilic and porous by etching treatment, the etching solution is adsorbed to the resin surface, and the adsorbed etching solution is mixed into the plating solution, making the plating solution unstable. Therefore, decomposition of the plating solution or plating may become impossible.

0004

[Means for Solving the Problems] Therefore, the present invention has been made in view of the above problem, and it is an object of the present invention to form a metal or alloy layer not directly on resin powder, but at least through inorganic particles. The first gist is metal-coated powder, in which inorganic particles are attached and fixed on resin powder, and a metal or alloy layer is formed on the outside of the inorganic particles; A method for producing a metal-coated powder in which a metal or alloy layer is formed by electroless plating after fixing and sensitizing inorganic particles, followed by activation treatment, or by simultaneously performing sensitization treatment and activation treatment. The second gist is that metal-coated powder is produced by attaching and fixing inorganic particles that have been previously sensitized and activated on resin powder, and then forming a metal or alloy layer by electroless plating. The third aspect is the production method, in which inorganic particles are attached and fixed on resin powder, the inorganic particles are treated with a silane coupling agent, and then the catalyst nuclei for electroless plating are adsorbed onto the inorganic particles. The fourth aspect is a method for producing a metal-coated powder that has been electrolytically plated to form a metal or alloy layer, in which catalyst nuclei for electroless plating are adsorbed onto resin powder after being treated with a silane coupling agent in advance. The fifth gist is a method for producing metal-coated powder in which inorganic particles are attached and fixed, and then electroless plating is applied to form a metal or alloy layer, and the resin powder is pretreated with a silane coupling agent. The sixth aspect is a method for producing a metal-coated powder in which a metal or alloy layer is formed by adsorbing catalyst nuclei for electroless plating after adhering and fixing inorganic particles, and then electroless plating is performed.

As schematically shown in FIG. 1, the metal-coated powder of the present invention basically consists of a resin powder 1, inorganic particles 2 formed on the resin powder 1, and the inorganic powder. It consists of a metal or a metal layer 3 formed on the outside of the particles 2. First of all,
As the resin powder 1 serving as the base material, natural fibers, natural resins,
Polyethylene, polypropylene, polyamide resin, polyacetal resin, polycarbonate, cellulose acetate resin,
Thermoplastic resins such as ABS, SAN, AS, styrene resin, vinyl chloride resin, polyacrylic acid resin, polyacetal, polyacrylonitrile, polyester, etc., thermosetting resins such as phenol resin, urea resin, urea resin, alkyd resin, melamine resin, etc. Examples include. The outer shape of these resin powders can be spherical, amorphous fiber, coiled, etc., and the inner shape can be various, such as solid, hollow, porous, etc.

Next, as the inorganic particles 2, metal silicates including aluminosilicates, metal carbides, metal oxides, metal nitrides, metal carbonates, metal halides, etc. are used singly or in combination of two or more. Ru. The shape of the inorganic particles can be varied in the same way as the resin powder, and the size can be selected depending on the purpose of use. As the inorganic particles, one or more types of inorganic colloid particles such as metals and oxides thereof may be used.

Furthermore, as the metal or alloy layer 3, Ni-
P, Ni-B, Co-B, Co-P, Ni, Co, Fe
, Ag, Au, Pd, Cr, Rh, Ru, Cd, Pb,
Sn, Zn, Zn-Cu, Ni-Co-P, Ni-W-
Examples include P, Ni-Fe-P, Co-Fe-P, Co-W-P, and the like. Moreover, these metal or alloy layers may be formed into two or three layers, or the metal or alloy may be formed with Al 2O
3, ZrO2, SiO2, TiO2, TiN, T
iC, SiC, C, MoS 2, WS 2, BN, Ba
Oxides such as SO4, CrB2, ZrB2, inorganic substances such as carbides, nitrides, borides, sulfides, PTFF,
It may also be a composite layer containing organic substances such as ABS, PP, PE, polycarbonate, and latex. The metal or alloy layer 3 in the present invention may also include a layer formed on the outside of inorganic particles 2 discontinuously adhered and fixed on the resin powder 1, as schematically shown in FIG. include.

[0008] Next, the manufacturing method can be roughly classified into the following five methods. The first method is to attach and fix inorganic particles onto resin powder, sensitize the inorganic particles, then perform activation treatment, or perform sensitization treatment and activation treatment simultaneously, and then electroless plating. This is a method of forming a metal or alloy layer by a method. That is, first, the inorganic particles are mechanically attached and fixed onto the resin powder by processing the resin powder and the inorganic particles using an automatic mortar, ball mill, jet mill, atomizer, hybridizer, etc. Next, the inorganic particles are dispersed in an aqueous solution of a reducing substance such as stannous chloride using a known sensitization process, filtered and washed with water, and then subjected to a known activation process such as palladium, copper, silver, etc. The inorganic particles are treated by adsorbing palladium chloride or the like onto the inorganic particles by dispersing them in an aqueous solution of chlorides, sulfates, etc. of gold, platinum, etc. Incidentally, the sensitization treatment and the activation treatment may be performed at the same time (generally referred to as catalyzing). Finally, a metal or alloy layer is formed on the outside of the inorganic particles using a known electroless plating method.

The second method is to perform sensitization and activation treatment on the resin powder in advance (even if activation treatment is performed after sensitization treatment, sensitization treatment and activation treatment are not performed at the same time). (Catalyzing) may be used, but catalyzing has the advantage of simplifying the process. Catalyzing is performed when inorganic colloid particles are used as the inorganic particles.) After attaching and fixing the inorganic particles , a method of forming a metal or alloy layer by electroless plating. The difference between the second method and the first method is that, in the second method, before the inorganic particles are mechanically attached and fixed onto the resin powder, the inorganic particles are preliminarily coated with the inorganic particles as described in the first method. Similar sensitization treatment,
This is due to activation treatment. That is, the second method is to process inorganic particles that have been previously sensitized and activated together with resin powder using an automatic mortar, ball mill, jet mill, atomizer, hybridizer, etc. After mechanically adhering and fixing inorganic particles thereon, a metal or alloy layer is formed on the outside of the inorganic particles using a known electroless plating method. This method has the advantage that process management is easier than in the first method.

The third method is to attach and fix inorganic particles onto resin powder, treat the inorganic particles with a silane coupling agent, and then allow the inorganic particles to adsorb catalyst nuclei for electroless plating. This is a method of forming a metal or alloy layer by electrolytic plating. That is, first, resin powder and inorganic particles are processed in an automatic mortar, ball mill, jet mill, atomizer,
Inorganic particles are mechanically attached and fixed onto the resin powder by treatment using a hybridizer or the like. Next, the inorganic particles are treated with a silane coupling agent. Specifically, an amino-based silane coupling agent, an epoxy-based silane coupling agent, a thiol-based silane coupling agent, etc. are used as the silane-based coupling agent, and the treatment method is mainly water, but if necessary, methanol, Mix lower alcohols such as ethyl alcohol and propyl alcohol, and add 0.1 to 5 % of a silane coupling agent to this.
It is treated by adding about vol/vol% and dispersing the inorganic particles attached and fixed to the resin powder. Furthermore, it adsorbs catalyst nuclei for electroless plating, and examples of metals that serve as catalyst nuclei include Pd and Ag.
, Au, Rh, Cu, etc. chloride, sulfate, nitrate, etc. are used as an aqueous solution of about 0.1 to 10%. As a treatment method, the inorganic particles attached and fixed to the coupled resin powder may be dispersed in the aqueous solution. Finally, a metal or alloy layer is formed on the outside of the inorganic particles using a known electroless plating method.

[0011] The fourth method is to attach and fix inorganic particles, which have been previously treated with a silane coupling agent and adsorbed with catalyst nuclei for electroless plating, on resin powder, and then electroless plate is applied to the metal. Alternatively, it is a method of forming an alloy layer. The difference between the fourth method and the third method is that in the fourth method, before mechanically attaching and fixing the inorganic particles onto the resin powder,
The point is that the inorganic particles were previously treated with a silane coupling agent and a treatment to adsorb catalyst nuclei for electroless plating, similar to the first method. That is, the fourth method uses inorganic particles that have been previously treated with a silane coupling agent and treated to adsorb catalyst nuclei for electroless plating together with resin powder.
automatic mortar, ball mill, jet mill, atomizer,
After mechanically adhering and fixing the inorganic particles onto the resin powder by processing with a hybridizer etc., a metal or alloy layer is formed on the outside of the inorganic particles using a known electroless plating method. It is something. In this method, the third
Compared to the above method, this method has the advantage that the process can be easily controlled.

The fifth method is an intermediate method between the third method and the fourth method, in which inorganic particles, which have been treated with a silane coupling agent in advance, are attached and fixed onto the resin powder. This is a method in which catalyst nuclei for electroless plating are adsorbed, and then electroless plating is performed to form a metal or alloy layer. Incidentally, the treatment with a silane coupling agent, the treatment to adsorb catalyst nuclei, and the method of fixing inorganic particles to resin powder are the same as in the third method and the fourth method.

[0013]

[Function] By fixing inorganic particles on resin powder, the present invention improves water wettability and makes it possible to easily apply electroless plating to inorganic particles. This eliminates contamination and allows stable formation of metal or alloy layers, as well as processing of various resins.

[0014]

[Example] (Example 1) As resin powder, Sumitomo Chemical (
Fine Pearl Polystyrene 3000SP (average particle size 6 μm) manufactured by Co., Ltd. was used, aluminum oxide 60 (type E) manufactured by Merck & Co., West Germany was used as the inorganic particle, and 100 parts of 3000SP and 20 parts of aluminum oxide 60 were placed in a ball mill. A time treatment was performed to obtain powder in which aluminum oxide 60 was mechanically adhered to the spherical resin surface. Next, stannous chloride 40g/l
The resin powder with inorganic particles attached was added to a 40 ml/l aqueous solution of hydrochloric acid (35%) and dispersed at 40° C. for 5 minutes with forced stirring (sensitization treatment). Thereafter, after filtration with a membrane filter and thorough washing with water, the inorganic particles were dispersed in 0.1 g/l of palladium chloride and 1 ml/l of hydrochloric acid (35%) at room temperature with forced stirring and treated for 5 minutes. Metallic palladium was deposited on the surface (activation treatment). After filtering this with a membrane filter and washing thoroughly with water, electroless plating solution containing 40 g/l of nickel sulfate, 25 g/l of sodium citrate, and 20 g/l of sodium hypophosphite
g/l, sodium acetate 15 g/l, ammonium chloride 5 g/l, pH 5.5, and treated at 60° C. for 5 minutes to obtain a powder in which a Ni-P alloy layer was formed.

(Example 2) XC99-301 (silicone resin, average particle size 4 μm) manufactured by Toshiba Silicone Co., Ltd. was used as the resin powder, and Daimei Chemical Co., Ltd. (Silicone resin, average particle size 4 μm) was used as the inorganic particle.
Taimicron AG manufactured by Co., Ltd. (alumina, particle size 0.2 μm)
) and treated with a hybridizer (manufactured by Nara Kikai Seisakusho Co., Ltd.) for 5 minutes to obtain powder in which alumina particles were adhered to resin powder. Next, stannous chloride 2
0g/l, palladium chloride 0.2g/l, hydrochloric acid (35%
) 20 ml/l and treated for 5 minutes (catalyzing). After that, after filtering with a membrane filter and washing thoroughly with water, electroless plating solution containing 7g of copper sulfate/
l, potassium sodium tartrate 75g/l, triethanolamine 10ml/l, formalin (37%) 25m
l/l, sodium hydroxide 20g/l, sodium carbonate 10g/l, sodium cyanide 0.125g/l, p
By performing a dispersion treatment at H8.0 and 52° C. for 15 minutes, copper was precipitated on the surface of the inorganic particles to obtain metal-coated powder.

(Example 3) As a resin powder, Lubron L-5 (fluororesin, average particle size 7μ) manufactured by Daikin Industries, Ltd.
5 m) using a hybridizer (manufactured by Nara Kikai Seisakusho Co., Ltd.) using Thyroid 150 (silica, particle size 1.4 μm) manufactured by Fuji Davison Co., Ltd. as an inorganic particle.
By processing for a minute, a powder with silica particles adhered to the resin powder was obtained. Next, 20 g/l of stannous chloride,
Palladium chloride 0.2g/l, hydrochloric acid (35%) 20ml
/l and treated for 5 minutes (catalyzing)
. After that, it was filtered with a membrane filter and thoroughly washed with water, and then dispersed in an electroless plating solution of 30 g/l of nickel chloride, 10 g/l of sodium hypophosphite, 50 g/l of sodium hydroxyacetate, pH 4.5, and 90°C for 10 minutes. A powder coated with Ni-P was obtained by the treatment. After filtering this and washing thoroughly with water, 2 g of potassium gold cyanide
/l, ammonium chloride 75g/l, sodium citrate 50g/l, sodium hypophosphite 10g/l, pH
7.5, and was subjected to a dispersion treatment at 90°C to obtain a powder in which Au was coated on Ni-P.

(Example 4) LANCO-WAX-PP1362D (polypropylene, average particle size 12 μm) manufactured by Ito Oil Co., Ltd. was used as the resin powder, and Kieselguhr G (diatomaceous earth) manufactured by Merck & Co., West Germany was used as the inorganic particle.
The powder was treated in an automatic mortar for 3 hours to obtain a powder in which fine particles of diatomaceous earth were adhered to the surface of the polypropylene powder. Next, it was dispersed in 20 g/l of stannous chloride, 0.2 g/l of palladium chloride, and 20 ml/l of hydrochloric acid (35%), and treated for 5 minutes (catalyzing). After that, after filtering with a membrane filter and washing thoroughly with water, the electroless plating solution was 7 g/l of nickel sulfate, 35 g/l of sodium tungstate, and 15 g of sodium citrate.
/l, sodium hypophosphite 10g/l, pH 9.8,
Ni-W-P was dispersed at 95°C for 15 minutes.
A powder coated with an alloy layer was obtained.

(Example 5) Aluminum oxide 60 (type E) manufactured by Merck & Co., West Germany was used as the inorganic particles, and this was mixed with 0.2 g/l of palladium chloride, 20 g/l of stannous chloride, and 20 ml of hydrochloric acid (35%). Dispersed in the liquid and treated for 10 minutes while stirring (catalyzing)
. Thereafter, it was filtered using a membrane filter, thoroughly washed with water, and then dried at 60 to 70°C. Next, as resin powder (
Using SNP-638 (sponge-like nylon powder, average particle diameter 17.0 μm) manufactured by Metal Color Co., Ltd., the inorganic particles were attached and fixed to the resin powder by treating them together with the treated inorganic particles in an automatic mortar for 4 hours. did. After that, electroless plating solution of nickel sulfate 40g/l, sodium citrate 25g/l, sodium hypophosphite 2
0g/l, sodium acetate 15g/l, ammonium chloride 5g/l, pH 5.5, and treated at 60°C for 10 minutes with stirring to obtain a powder coated with a Ni-P alloy layer.

(Example 6) Thyroid 150 (silica, particle size 1.4, manufactured by Fuji Davison Co., Ltd.) was used as an inorganic particle.
μm), and mixed it with 40 g/l of stannous chloride and hydrochloric acid (
35%) in a 40 ml/l aqueous solution and treated for 5 minutes (sensitization treatment). Thereafter, it was filtered, washed with water, and dispersed at room temperature in 0.1 g/l of palladium chloride and 1 ml/l of hydrochloric acid (35%) to precipitate metal palladium on the surface of the inorganic particles (
activation process). This was filtered with a membrane filter, thoroughly washed with water, and then dried. Next, as a resin powder, Fine Pearl Polystyrene 3000SP manufactured by Sumitomo Chemical Industries, Ltd.
(average particle diameter 6 μm) was used together with inorganic particles on which metallic palladium was precipitated using a hybridizer ((
(manufactured by Nara Kikai Seisakusho Co., Ltd.) for 5 minutes to obtain powder in which silica particles were adhered to resin powder. Next, an electroless plating solution, Nippon Kanigen Co., Ltd.'s Blue Shuma, was diluted 5 times, dispersed in the solution, and treated at 60°C for 10 minutes to obtain a powder coated with a Ni-P alloy layer. .

(Example 7) Fine pearl polystyrene 3000SP (average particle size 6 μm) manufactured by Sumitomo Chemical Co., Ltd. was used as the resin powder, and alumina colloid (manufactured by Nissan Chemical Co., Ltd., Alumina Sol 300,
Alumina colloid 10
The resin powder was dispersed in a % aqueous solution and forcedly stirred to adhere colloidal particles onto the resin. Thereafter, it was filtered, dried, and further treated for 2 minutes with a hybridizer (manufactured by Nara Kikai Seisakusho Co., Ltd.) to fix the alumina colloid on the resin powder to obtain a powder. Next, stannous chloride 20g/l, palladium chloride (average particle size 5nm) 0
．． 2 g/l, dispersed in 20 ml/l of hydrochloric acid (35%) and 1
Processed for 0 minutes (catalyzing). After that, it is filtered with a membrane filter and washed thoroughly with water, and the electroless plating solution is nickel chloride 30g/l and sodium hypophosphite 10g.
/l, sodium hydroxyacetate 50g/l, pH 4.
5. A powder coated with a Ni-P alloy layer was obtained by processing at 90° C. for 10 minutes. After filtering and thoroughly washing with water, it was treated with potassium gold cyanide 2g/l, ammonium chloride 75g/l, sodium citrate 50g/l, sodium hypophosphite 10g/l, pH 7.5, and at 90°C for 5 minutes. , a powder in which Au was coated on Ni-P was obtained.

(Example 8) Cataloid Sl-80P manufactured by Catalysts & Chemicals Co., Ltd. as inorganic colloid particles
(Silica colloid, average particle size 70-90 nm)
% aqueous solution, palladium chloride (average particle size 5
nm) 0.2 g/l, stannous chloride 20 g/l, hydrochloric acid (
35%) 20 ml/l was added and then uniformly dispersed with forced stirring (composite colloid in which palladium colloid was adsorbed to silica colloid, catalyzing)
. Next, as a resin powder, LANCO-
WAX-PP1362D (polypropylene, average particle size 12 μm) was used and treated with the treated composite colloid for 10 minutes in an automatic mortar to obtain a resin powder in which composite colloid particles were immobilized. Next, electroless plating solution of copper sulfate 7g/l and potassium sodium tartrate 75g
/l, triethanolamine 10ml/l, formalin (37%) 25ml/l, sodium hydroxide 20g/l
, sodium carbonate 10g/l, sodium cyanide 0.
A resin powder coated with copper was obtained by dispersing the powder at 125 g/l, pH 8.0, and treating at 52° C. for 15 minutes.

(Example 9) Fine pearl polystyrene 3000SP (average particle size 6 μm) manufactured by Sumitomo Chemical Co., Ltd. was used as the resin powder, and Snowtex ZL (silica colloid, manufactured by Nissan Chemical Co., Ltd.) was used as the inorganic colloid particles.
The silica colloid was diluted 10 times with water and forcefully stirred together with the resin powder to disperse it, and the silica colloid was deposited on the resin. Thereafter, it was filtered with a membrane filter, washed with water, dried, and further treated with a hybridizer (manufactured by Nara Kikai Seisakusho Co., Ltd.) for 2 minutes to fix the silica colloid on the resin powder to obtain a resin powder. Next, a dispersion treatment was carried out for 5 minutes in an aqueous solution of 40 g/l of stannous chloride and 40 ml/l of hydrochloric acid (35%) (sensitization treatment). After filtering and washing with water, palladium chloride (average particle size 5 nm) 0.1 g/l, hydrochloric acid (35%) 1 ml/l
A dispersion treatment was carried out for 5 minutes at room temperature (activation treatment). Thereafter, it was filtered with a membrane filter and thoroughly washed with water. next,
Electroless plating solution: copper sulfate 7g/l, potassium sodium tartrate 75g/l, triethanolamine 10ml/l
, formalin (37%) 25 ml/l, sodium hydroxide 20 g/l, sodium carbonate 10 g/l, sodium cyanide 0.125 g/l, pH 8.0, dispersed at 50°C and treated for 15 minutes to coat copper. A powder was obtained.

(Example 10) Fine Pearl Polystyrene 3000SP (manufactured by Sumitomo Chemical Co., Ltd.) was used as the resin powder.
Thyroid 150 (silica, particle size 1.5 μm) manufactured by Fuji Davison Co., Ltd. was used as the inorganic particle.
4 μm) and treated with a hybridizer (manufactured by Nara Kikai Seisakusho Co., Ltd.) for 5 minutes to obtain powder in which silica particles were adhered and fixed onto resin powder. Next, aminosilane coupling agent 1 manufactured by Nippon Unicar Co., Ltd.
0.2 vol of 100 in water:methyl alcohol = 9:1
The aminosilane coupling agent was formed on the silica particles by dispersing the powder therein and treating it at room temperature for 1 hour. After filtration, palladium chloride 1
．． It was dispersed in a 0 mM aqueous solution and treated at room temperature for 1 hour to adsorb palladium chloride. After that, it was filtered, and after thorough washing with water, electroless plating solution containing copper sulfate 7 g/l, potassium sodium tartrate 75 g/l, triethanolamine 10 ml/l,
Formalin (37%) 25ml/l, sodium hydroxide 10g/l, sodium cyanide 0.125g/l, p
A copper-coated powder was obtained by dispersing at 52° C. and treating for 15 minutes.

(Example 11) Inorganic particles were Taimicron AG (alumina, particle size 0.
2 μm), and added aminosilane coupling agent 1100 (manufactured by Nippon Unicar Co., Ltd.) to it in a mixture of water: methyl alcohol.
0.2 vol/vol% was added to 9:1 and dispersed for 1 hour at room temperature. After filtration, it was dispersed in an aqueous solution of 1.0 mM palladium chloride and treated at room temperature for 1 hour to adsorb palladium chloride. Thereafter, it was filtered, thoroughly washed with water, and then dried. LANCO-WAX-PP1 manufactured by Ito Oil Co., Ltd. as resin powder
362D (polypropylene, average particle size 12 μm) is used, and alumina particles are attached and fixed on the resin powder by treating it with the inorganic particles for 5 minutes in a hybridizer (manufactured by Nara Kikai Seisakusho Co., Ltd.). I got it. After that, Ni-P was coated by dispersing it in an electroless plating solution of 30 g/l of nickel chloride, 10 g/l of sodium hypophosphite, and 50 g/l of sodium hydroxyacetate, pH 4.5, at 60°C and treating for 3 minutes. A powder was obtained.

(Example 12) As inorganic particles, Taimicron AG (alumina, particle size 0.
2 μm), and added aminosilane coupling agent 1100 (manufactured by Nippon Unicar Co., Ltd.) to it in a mixture of water: methyl alcohol.
0.2 vol/vol% was added to 9:1 and dispersed for 1 hour at room temperature. After filtration, it was dispersed in an aqueous solution of 1.0 mM palladium chloride and treated at room temperature for 1 hour to adsorb palladium chloride. Thereafter, it was filtered, thoroughly washed with water, and then dried. Using Fine Pearl Polystyrene 3000SP (average particle size 6 μm) manufactured by Sumitomo Chemical Co., Ltd. as the resin powder, the resin powder was obtained by processing it together with the inorganic particles for 5 minutes in a hybridizer (manufactured by Nara Kikai Seisakusho Co., Ltd.). A powder with alumina particles attached and fixed thereon was obtained. Thereafter, it was dispersed in an aqueous solution of 1.0 mM palladium chloride and treated at room temperature for 1 hour to adsorb palladium chloride. Thereafter, it was filtered and thoroughly washed with water. Next, 30g of nickel chloride of electroless plating solution
/l, sodium hypophosphite 10g/l, sodium hydroxyacetate 50g/l, pH 4.5, dispersed at 60°C and treated for 10 minutes to obtain a powder coated with Ni-P.

Although an outline of the present invention has been described above, the present invention is not limited to the above description. For example, depending on the purpose of use, another layer may be interposed between the inorganic particles formed on the resin powder and the metal or alloy layer, or
In the field of application, the metal-coated powder of the present invention can be rolled into flakes, films, or sheets to expand its uses, and furthermore, the metal-coated powder of the present invention can be rolled into flakes, films, or sheets. By chemically developing color, it can be used as a new coloring agent.

[0027]

Effects of the Invention When the metal coating powders obtained in Examples 1 to 12 were checked for metal coverage, it was confirmed that they were completely coated. Furthermore, when we looked at the stability of the plating solutions during the process, they were all stable.

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically showing an example of the metal-coated powder of the present invention.

FIG. 2 is a diagram schematically showing another example of the metal-coated powder of the present invention.

[Explanation of symbols]

1 Resin powder 2 Inorganic particles 3 Metal or alloy layer

Claims (6)

[Claims] 1. A metal-coated powder in which inorganic particles are adhered and fixed onto resin powder, and a metal or alloy layer is formed on the outside of the inorganic particles. [Claim 2] Inorganic particles are attached and fixed onto the resin powder, and the inorganic particles are sensitized and then activated, or
A method for producing a metal-coated powder in which a sensitization treatment and an activation treatment are performed simultaneously, and then a metal or alloy layer is formed by electroless plating. [Claim 3] A method for producing metal-coated powder, in which inorganic particles that have been previously sensitized and activated are adhered and fixed onto resin powder, and then a metal or alloy layer is formed by electroless plating. . [Claim 4] After adhering and fixing inorganic particles onto resin powder and treating the inorganic particles with a silane coupling agent, catalyst nuclei for electroless plating are adsorbed onto the inorganic particles, and further electroless plating is performed. A method for producing metal-coated powder with a metal or alloy layer formed thereon. 5. On the resin powder, inorganic particles that have been treated with a silane coupling agent and adsorbed with catalyst nuclei for electroless plating are attached and fixed, and then electroless plating is performed to form a metal or alloy layer. A method for producing the formed metal-coated powder. 6. After adhering and fixing inorganic particles previously treated with a silane coupling agent onto the resin powder, adsorbing catalyst nuclei for electroless plating, and then performing electroless plating to form a metal or alloy layer. A method for producing metal-coated powder.