JPH02119932A - Capsular powder containing metal particles - Google Patents

Abstract

PURPOSE:To uniformly disperse metal particles in porous powder and to prevent the discoloration of the metal particles by embedding the metal particles in the porous powder to attain encapsulation by pore sealing. CONSTITUTION:Particles of one or more kinds of metals such as gold, silver, copper and iron are mixed with porous powder of resin such as nylon or polystyrene and mixing-grinding force and/or mechanical impact is applied to the mixture with a ball mill, an atomizer, etc. The metal particles are embedded in the porous resin powder to attain encapsulation by pore sealing and capsular powder contg. metal particles is obtd. The metal particles are uniformly dispersed in the porous resin powder and the discoloration of the metal particles is prevented. The metal particles improve the mechanical strength and wear resistance of the resin powder and is used as a colorant to utilize the color tone and luster.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides a metal particle-containing capsule in which a uniform dispersion state of metal particles is maintained in the powder and the metal particles are not exposed to the powder surface. Regarding compacted powders, more specifically, encapsulated powders containing metal particles that are suitably used as molding materials that require wear resistance and mechanical strength, and coloring agents for cosmetics, inks, paints, etc. It is related to.

[Traditional technique It? ] Conventionally, as a powder containing metal particles, so-called pellets, which are made by kneading and dispersing metal particles into molten resin and then crushing them, have been known as molding materials. Metal particles embedded in the pores of porous powder or porous powder are known as colorants for cosmetics, inks, paints, and the like.

[Problems to be Solved by the Invention] However, the above-mentioned conventional powder containing metal particles had the following problems.

That is.

■In the case of so-called pellets, which are made by kneading and dispersing metal particles into molten resin and then crushing them, the dispersion of the metal particles in the resin becomes uneven, and the resulting molded product has a uniform dispersion of metal particles. A decrease in mechanical strength and wear resistance occurs compared to the molded product in the same condition.

■In the case of metal particles implanted into the surface of spherical powder or metal particles embedded in the pores of porous powder, there was a problem of discoloration of the metal particles due to contact with other components. .

The object of the present invention is to provide a powder containing metal particles that solves the problem of non-uniform dispersion of metal particles and discoloration of metal.

[Means for Solving the Problems] The present invention has been made to achieve the above object, and includes embedding metal particles in the pores of porous powder.

The gist of the present invention is an encapsulated powder containing metal particles, which is characterized by being encapsulated by sealing the pores.

The present invention will be explained in detail below.

The metal particles of the metal particle-containing encapsulated powder according to the present invention improve the mechanical strength and abrasion resistance of the resin powder,
Alternatively, it is used as a coloring agent that takes advantage of the color tone and luster of the metal itself, and various conventionally known coloring agents can be used. Specifically, gold, silver, copper, iron, platinum, nickel,
aluminum.

Tungsten, cobalt, titanium, magnesium.

Tantalum, molybdenum, wA, lead, zinc, zirconium, and alloys such as brass, nickel silver, copper-titanium, silver-gold, and iron.
One type or a mixture of two or more metal powders such as cobalt and iron-nickel can be used, and the amount used is preferably 50 to 900 parts by weight per 100 parts by weight of the porous powder described below. The diameter varies depending on the type of porous powder used.

In this encapsulated powder containing metal particles, the metal particles are embedded in the pores of the porous powder.

It needs to be smaller than the pore diameter of the porous powder, and preferably 1/20 or less of the particle diameter of the porous powder.

The porous powder is made into an encapsulated powder containing gold AOI particles by embedding metal particles in the pores and further encapsulating the pores. Specifically, porous nylon, porous nylon, One type or a mixture of two or more of porous resin powders such as porous polystyrene, porous cellulose, porous polyacryloamide, and porous styrene-divinylbenzene can be used.

Note that the particle size of the porous powder is not particularly limited.

When used as a molding material, the smaller the particle size, the better the dispersion uniformity of metal particles.
It is preferably 50 μn1 or less for cosmetics, from the viewpoint of texture when applied to the skin, and for ink, from the viewpoint of sedimentation of the powder over time.

To obtain the metal particle-containing encapsulated powder according to the present invention,
Mix the above metal particles and porous powder.

The metal particles are embedded (i.e., buried) in the pores of the porous powder by applying a mixed grinding force and/or a mechanical percussion force, and the pores are further closed near the surface of the porous powder (i.e., The method of encapsulation is as follows: 1. Melting or softening the surface of porous powder by applying mixing grinding force and/or mechanical impact force to seal the pores and encapsulate it. Method.

■Polystyrene and nylon on the surface of porous powder.

After adhering a resin powder that easily melts or softens, such as polyethylene or polymethyl methacrylate, mixed grinding force and/or mechanical impact force is applied to form a film on the surface of the porous powder with the resin powder. A method such as forming a pore-sealing capsule and encapsulating it can be adopted.

In order to apply the above-mentioned mixed grinding force and/or mechanical impact force, various conventionally known devices can be used.
A jet mill or the like can be suitably used, and as a device for applying mechanical impact force, an atomizer, a hammer mill, a hybridizer (trade name: Nara Kikai Seisaku Shin), etc. can be suitably used.

[Work] The metal particle-containing encapsulated powder according to the present invention is as follows.

Since the metal particles are embedded in porous powder and encapsulated by sealing the pores, the metal particles are uniformly dispersed in the porous powder and there is no discoloration of the metal particles. Conceivable.

In addition, when used as a molding material, the metal particles are uniformly dispersed during molding, and mechanical strength and wear resistance are less likely to deteriorate compared to molded products with non-uniform dispersion. Also, when used as a coloring agent in cosmetics, inks, paints, etc., metal particles encapsulated with sealed pores are less likely to change color.

Furthermore, since the metal particles are not detached from the powder, non-uniform dispersion can be prevented.

When used in cosmetics, inks, paints, etc., it is presumed that sedimentation of metal particles is less likely to occur.

[Example] Examples, application examples and comparative examples used in molding materials will be described in more detail below, and in each example, "r parts" indicates "parts by weight."

Example 1 Porous nylon (average particle size 13.9 μm) 20 parts Copper powder (average particle size 0.05 μm) 80 parts The above ingredients were treated with a hybridizer by applying mechanical impact force for 5 minutes, and further treated with a mechanical impact force for 5 minutes. A stronger mechanical impact force was applied to obtain an encapsulated powder containing metal particles.

Example 2 Porous polystyrene (average particle size 30 μrn)
60 parts nickel powder (average particle size 0.02 μm)
15 parts aluminum powder (average particle size 0.1 μm)
25 parts The above ingredients were mixed and ground in an automatic mortar for 1 hour,
Thereafter, a mechanical impact force was applied for 5 minutes using a hybridizer to obtain an encapsulated powder containing metal particles.

Example 3 Porous nylon (average particle size 13.9 μm) 30
Iron powder (average particle size 0.02μrn)
70 parts of the above components were treated with a hybridizer by applying mechanical impact force for 5 minutes, and further treated by applying stronger mechanical impact force for 5 minutes to obtain an encapsulated powder containing metal particles.

Example 4 Porous polystyrene (average particle size 30 μm) 35 parts Cobalt powder (average particle size 0.02 μm) 30 parts Pig iron-Kkel alloy powder 20 parts (
Average particle size: 0.02 μm) Polyethylene (average particle size: 5 μm) 20
Polymethyl methacrylate (average particle size 0.3μ
rn) 5 parts Among the above ingredients, porous polystyrene, cobalt powder, and iron-nickel alloy powder were mixed and ground in an automatic mortar for 1 hour, and then the above polyethylene and polymethyl methacrylate were added, and further mixed with a hybridizer for 5 parts. Processed by applying mechanical impact force for minutes,
An encapsulated powder containing metal particles was obtained.

Example 5 Porous cell a-(average particle size 10Itm)
50 parts copper powder (average particle size 0.05 μm)
40 parts polymethyl methacrylate (average particle size 0
．． 3 μm) 10 parts Among the above ingredients, porous cellulose and copper powder were mixed and ground in an automatic mortar for 1 hour, then the above polymethyl methacrylate was added and further mixed and ground for 1 hour in an automatic mortar, and the metal A particle-containing encapsulated powder was obtained.

Application example 1 (molded product) Using the encapsulated powder containing metal particles obtained in Example 1, a plate with a length of 5 cm, a width of 4, and a thickness of 0.5 mm was made using an injection molding machine (manufactured by Arburg, West Germany). Obtained.

Application Example 2 (Molded Product) The metal particle-containing encapsulated powder obtained in Example 2 was processed in the same manner as in Application Example 1 to obtain a plate.

Application Example 3 (Molded Product) The metal particle-containing encapsulated powder obtained in Example 3 was processed in the same manner as in Application Example 1 to obtain a plate.

Application Example 4 (Molded Product) The metal particle-containing encapsulated powder obtained in Example 4 was processed in the same manner as in Application Example 1 to obtain a plate.

Comparative Example 1 (Molded product) While melting 20 parts of spherical nylon (particle size 6 μm) in a twin-screw compact press molding machine (manufactured by Ikegai Iron Works), copper powder (average Particle size 0.05
μm) was added, mixed and dispersed, and then crushed to form pellets. A plate was obtained from this pellet in the same manner as in Application Example 1.

Comparative Example 2 (Molded product) 60 parts of spherical polystyrene (particle size 30 μm), 15 parts of nickel powder (particle size 0.02 μm), and 25 parts of aluminum powder (particle size 0.1 μm) were prepared as in Comparative Example 1. and obtained a plate.

Comparative Example 3 (molded product) 30 parts of crushed nylon and iron powder (particle size 0°02 μm)
) 70 parts in the same manner as in Comparative Example 1 to obtain a plate.

Comparative Example 4 (molded product) 35 parts of spherical polystyrene (particle size 30 μm), 20 parts of polyethylene (particle size 5 μm), 5 parts of polymethyl methacrylate (particle size 0.3 μm), and cobalt powder (particle size 0.02 μm) A plate was obtained in the same manner as in Comparative Example 1 using 30 parts of iron-nickel alloy powder (particle size: 0.02 μm) and 20 parts.

Comparative Example 5 (molded product) Spherical polystyrene (average particle size 30 μm) 35 parts Cobalt powder (average particle size 0.02 μm) 30 parts Iron-nickel alloy powder 20 parts (
(average particle diameter: 0.02 μrn) The above components were mixed and ground in an automatic mortar for 1 hour to obtain a composite powder in which cobalt particles and iron-nickel alloy particles were implanted onto the surface of spherical polystyrene. A plate was obtained from this composite powder in the same manner as in Application Example 1.

Comparative Example 6 (molded product) 20 parts of spherical nylon (average particle size 6 μm) 80 parts of copper powder (average particle size 0.05 μm) The above components were treated with a hybridizer by applying mechanical impact force for 5 minutes to form a spherical nylon surface. A composite powder into which copper powder was implanted was obtained.

Comparative Example 7 (Powder) Porous polystyrene (average particle size 30 μm) 60 parts nickel powder (average particle size 0.02 μrn)
15 parts aluminum powder (average particle size 0.1 μm)
25 parts of the above ingredients were mixed and ground in an automatic mortar for 1 hour to obtain a composite powder in which nickel powder and aluminum powder were embedded in the pores.

Comparative Example 8 (Powder) Porous nylon (average particle size 13.9 μm) 30
Iron powder (average particle size 0.02μm) 70
The above components were treated with a hybridizer by applying mechanical impact force for 5 minutes to obtain a composite powder in which iron particles were embedded in the pores.

Comparative Example 9 (Powder) Porous cellulose (average particle size 10 μm)
50 parts copper powder (average particle size 0.05 μm)
40 parts of the above components were treated with a hybridizer by applying mechanical impact force for 5 minutes to obtain a composite powder in which copper particles were embedded in the pores.

[Effect of the invention] When the metal particle-containing encapsulated powders obtained in Examples 1 to 5 above were observed using an electron microscope, no openings were observed on the powder surface, indicating that the pores were completely sealed. It could be confirmed.

Metal particles were also not found around or on the surface of the powder, confirming that they were embedded in the pores of the porous powder.

Confirmation of Effect 1 (Dispersibility) The dispersion state of metal particles was evaluated for the plates obtained in the applied examples based on Examples 1 to 4 and Comparative Examples 1 to 5.

The results are shown in Table 1.

Table 1 (dispersibility evaluation) The condition was visually determined.

n, FuL/) (1) 'R child'1jfit11
1 was photographed (20,000 times magnification) to determine the dispersion state of the metal particles.

Evaluation criteria ○: Uniformly distributed Δ: Aggregation of metal particles was observed.

Slightly non-uniform dispersion x: Confirmation of the effect of non-uniform dispersion with a lot of agglomeration of metal particles (discoloration) The powders obtained in Examples 1 to 3 and 5 and Comparative Examples 6 to 9 were After immersing it in water and leaving it for one month, the state of discoloration was visually determined. The results are shown in Table 2.

Evaluation method ■: Plates are exposed to sunlight. Dispersion evaluation criteria for metal particles: 0: No discoloration Δ: Slight discoloration X: Large discoloration Because the particles are uniformly dispersed and the metal particles do not discolor, for example, when used as a molding material, it has better mechanical strength and wear resistance than a molded product with uneven distribution of metal particles. It is practically valuable because it hardly causes any deterioration in properties and also hardly causes discoloration when used as a single coloring agent.

Procedural amendment Heisei 1 year July 1988 Patent Application No. 272444 2. Name of the invention

Claims (1)

[Claims] An encapsulated powder containing metal particles, characterized in that the metal particles are encapsulated by embedding them in the pores of a porous powder and sealing the pores.