JPH0136601Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention is mainly used as a packaging material for integrated circuits such as ICs and LSIs, and other electronic components, and also as a construction material for floors, walls, ceilings, etc., and for a wide range of other uses. The present invention relates to a laminate having conductivity, cushioning properties, heat insulation properties, flame retardance, etc., which can be suitably used for.

[Conventional technology and its problems]

For example, as a packaging material for integrated circuits and other electronic components, in addition to having cushioning properties that can protect electronic components from impact and being able to be used by piercing the terminal pins of electronic components, packaging materials can also be used to prevent charging due to static electricity and protect electronic components from static electricity. In order to meet this demand, there is a need for cushioning packaging materials with conductivity, such as those made by laminating a conductive resin film on a polyolefin resin foam (Jitsukasho).
58-101729), and one in which a foaming paint containing carbon black particles is applied or impregnated onto a base material such as paper or plastic film to form a foam (Japanese Utility Model Application Publication No. 58-151032) has been proposed. ing. However, in the former case, although it has cushioning properties and conductivity, the conductive resin film is manufactured by kneading conductive material with resin, which is time-consuming and requires lamination on the foam. In addition, sufficient conductivity cannot be obtained due to the resin intervening between the particles of the conductive material, and if the amount of conductive material added is increased in order to obtain sufficient conductivity, the film will not work properly. The strength decreases and the cost increases. In the latter case, carbon black may float in the foam, potentially contaminating the electronic components, and it is difficult to use the foam by piercing the terminal pins of the electronic components. In addition to being scratched when doing so, sufficient conductivity cannot be obtained due to the presence of resin between the carbon black particles, and the cost increases if the amount of carbon is increased to improve conductivity. .

Synthetic resin foams are also used as building materials such as heat insulators and soundproof wall materials due to their heat insulating, cushioning, and lightweight properties, but when exposed to flame, they soften and deform. There is a risk that it will burn, melt, and eventually catch fire. Therefore, it is also being done to add heat resistance and flame retardance to the surface by attaching metal plates, etc., but in this case, it is said that the elasticity and lightness of the surface, which are characteristic of synthetic resin foam, are impaired. There are drawbacks.

The present invention was created in view of the above, and has sufficient conductivity, cushioning properties, heat insulation properties, heat resistance, flame retardance, and lightness, and is suitable as a packaging material for electronic parts or as a construction material. The object of the present invention is to provide a laminate that can be used easily and inexpensively.

[Means for solving problems]

The inventors conducted research to solve the above problem.
As a result of repeated studies, we found that using metal spraying, a known metal coating technology, the surface of a synthetic resin foam is densely coated with a very thin metal coating layer made of laminated metal particles, ensuring extremely excellent conductivity. Moreover, if the surface of the synthetic resin foam is treated with metal powder before thermal spraying, the adhesiveness of the sprayed metal coating layer will be high, and the surface of the foam will be hardly melted and it will be thin. They discovered that coating could be applied, and based on this knowledge, they came up with this idea.

That is, the gist of the laminate of the present invention is that a metal coating layer is provided by thermal spraying of a metal material on the surface of a synthetic resin foam that has been surface-treated with metal powder.

[Effect]

The laminate of the present invention has the above-mentioned structure, and since the metal coating layer on the surface of the foam is formed by thermal spraying of a metal material, the fine particles of the sprayed metal become flat and mutually bonded to each other without intervening other materials such as resin. The entire structure is laminated as if it were a single piece, so even if it is a very thin layer, it can ensure excellent conductivity, and the surface of the foam that is sprayed with metal has a surface made of metal powder. The treatment improves the adhesion between the foam surface and the metal coating layer, allowing the metal coating layer to adhere extremely firmly to the foam surface even by thermal spraying at a relatively low temperature. The layers do not peel off and particles do not float. Furthermore, even when thermal spraying is performed at a relatively high temperature, the surface of the foam is covered with a treated layer of metal powder, so that the thick inside of the foam, which is the base material, will not be excessively melted or deformed. Therefore, this laminate also has a very thin metal coating layer.
In addition to possessing the characteristics of synthetic resin foam, such as cushioning, heat insulation, and lightness, the characteristics of the metal coating layer, such as conductivity, heat resistance, and flame retardancy, are added, and these combined effects are achieved. will be shown.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.
In the figure, a indicates a laminate according to the present invention, and 1
2 is a plate-shaped synthetic resin foam serving as the base material, 2 is a surface treatment layer obtained by surface-treating the surface of the synthetic resin foam 1 with metal powder, and 3 is a surface treatment layer of the surface treatment layer 2. 2 shows a thermally sprayed metal coating layer of metal material laminated thereon.

The above synthetic resin foam 1 is a foamed sheet obtained by extruding and foaming a styrene resin such as polystyrene or a copolymer mainly composed of styrene, a polyolefin resin, a polyvinyl chloride resin, or other thermoplastic resin. Alternatively, a plate-shaped foam made of expandable beads of the same resin can be used, and the expansion ratio and thickness can be arbitrarily determined depending on the manner of use and the material. For example, when using a foam sheet of styrene resin as a packaging material for electronic parts, a foam sheet with a foaming ratio of 5 to 50 times and a thickness of 2.0 mm or more, preferably about 5 to 10 mm, is preferably used. In addition, when using a terminal pin of an electronic component by piercing it, the thickness is set so that the piercing terminal pin does not protrude to the other surface.

In addition, methods for surface treatment with metal powder include a blasting method in which aluminum, zinc, copper, and other metal powders are directly sprayed onto the surface of the foam, and a method in which the metal powder is mixed with a solvent such as lacquer and foamed. There is a painting method in which it is applied to the body surface by means such as spraying. Blasting is used for materials that are soluble in solvents, such as polystyrene foam, and painting is used for materials such as polyethylene foam, where metal powder is difficult to adhere to the surface of the foam. The material can be appropriately selected depending on the properties of the synthetic resin foam, and materials intermediate between the two, such as copolymers of polyethylene and polystyrene, can be used in any method. Note that processing conditions such as air pressure and the mixing ratio of metal powder and solvent are appropriately determined depending on the material.

Further, the metal coating layer 3 is formed by metal spraying such as an arc spraying method such as aluminum, zinc, etc.
Copper and other metal materials are melted into fine particles,
It is formed by spraying onto the surface of the surface treatment layer 2 described above. Among them, by using a wire or powder as the metal material and performing low-temperature thermal spraying of the metal wire, the temperature of the metal coating layer 3 immediately after can be lowered, and melting and deformation of the foam sheet can be completely prevented.

Metal coating layer 3 by thermal spraying as above
In this process, fine metal particles sprayed in a spray form become flat, densely layered and integrated without any intervening materials, forming an extremely thin layer (e.g. 20 to 200 μm), and are thermally sprayed at a relatively low temperature. Even in this case, the surface treatment layer 2 interposed between the foam 1 and the metal coating layer 3 causes the metal coating layer 3 to firmly adhere to the surface of the foam 1. Further, even when thermal spraying is performed at a relatively high temperature, there is almost no change in the vicinity of the surface because the surface treatment layer 2 exists on the surface of the foam 1.

Next, the laminate of the present invention will be explained with specific examples.

Example 1 A sheet of polystyrene resin foam with a particle size of approx.
A blasting method in which 0.1 mm of aluminum powder is sprayed from a distance of 100 to 150 mm at an air pressure of 2.0 Kg/cm ² is used as a means of surface treatment, and zinc is sprayed at an air pressure of 5.0 kg/cm2.
Thermal spraying was carried out under the conditions of Kg/ ^cm2 .

Example 2 A sheet of polyethylene resin foam with a particle size of approx.
A coating method in which a 1:3 mixture of 0.1 mm aluminum powder and lacquer was diluted 4 to 5 times with thinner and sprayed with an air gun was used as a surface treatment method, and zinc was applied in Example 1. Thermal spraying was carried out under the same conditions.

Example 3 Surface treatment and thermal spraying were carried out in the same manner as in Example 1, except that a copolymer resin foam of polystyrene and polyethylene was used as the sheet-like base material.

Example 4 Surface treatment and thermal spraying were carried out in the same manner as in Example 2, except that a copolymer resin foam of polystyrene and polyethylene was used as the sheet-like base material.

In all of the laminates of Examples 1 to 4 described above, the zinc coating layer was thinly and firmly adhered to the surface of the foam sheet, and neither deformation nor melting of the foam sheet occurred.

The metal coating layer 3 may be provided on one side of the foam sheet 1 or on both sides.

When the above-mentioned laminate of the present invention is used as a packaging material for electronic components such as integrated circuits, as shown in FIGS. 3 and 4, the terminal pins 11 of the electronic component 10 break through the metal coating layer 3, and The metal coating layer 3 is thin and the foam 1 is soft, so the terminal pin 11 will not be damaged. Furthermore, since the metal coating layer 3 has excellent conductivity, it is possible to prevent charging due to static electricity and protect the electronic component 10 from static electricity.Furthermore, since the foam 1 has excellent cushioning properties, the electronic component 10 can be protected from external impact. Can be protected.

Further, when this laminate is used as a building material, it can be attached to a floor, wall, ceiling, etc. to obtain the heat insulation, cushioning properties, etc. unique to the foam 1.

[Effect of idea]

As mentioned above, the laminate according to the present invention has excellent conductivity even when the metal coating layer on the surface of the synthetic resin foam is thin, does not cause peeling or floating, and has excellent cushioning properties due to the synthetic resin foam. To have
Suitable as a packaging material for electronic components such as integrated circuits such as ICs and LSIs.Since the metal coating layer is very thin, it can be used with terminal pins of electronic components piercing the metal coating layer and piercing the foam. Therefore, electronic components can be sufficiently protected from static electricity and external shock.

In addition, this laminate has the heat insulation, cushioning, and lightness characteristics unique to synthetic resin foam, and is also heat resistant because there is no risk of it deforming or melting even if flames are brought close to the metal coating layer. It is also suitable for use as a flame-retardant construction material for floors, walls, ceilings, etc., and has the advantage of being extremely lightweight, making construction work more efficient.

Furthermore, it can be manufactured simply by subjecting the synthetic resin foam base material to a simple surface treatment with metal powder and then thermal spraying the metal powder, and since only a small amount of metal material is required, it can be provided easily and inexpensively. There is an effect.

[Brief explanation of the drawing]

1 and 2 are a perspective view and a sectional view showing an embodiment of the present invention, and FIGS. 3 and 4 are a perspective view and a sectional view showing the embodiment in use as a packaging material for electronic parts. It is. 1...Synthetic resin foam, 2...Surface treatment layer, 3
...Metal coating layer.

Claims (1)

[Claims for Utility Model Registration] 1. A laminate characterized in that a metal coating layer is provided by thermal spraying of a metal material on the surface of a synthetic resin foam that has been surface-treated with metal powder. 2. The laminate according to claim 1, wherein the surface treatment with metal powder is performed by spraying the metal powder onto the surface of the synthetic resin foam. 3. The laminate according to claim 1, wherein the surface treatment with metal powder is performed by applying a solvent mixed with metal powder to the surface of the synthetic resin foam. 4 Utility model registration claim 1 in which the metal coating layer is obtained by low-temperature thermal spraying of metal wire
The laminate according to item 1, 2 or 3. 5 Synthetic resin foams include styrene resin foams such as polystyrene and copolymers mainly composed of styrene, olefin resin foams such as polyethylene, polypropylene, and copolymers mainly composed of these, and polyvinyl chloride resin foams. The laminate according to claim 1, 2, 3, or 4 of the utility model registration claim, which is made of a thermoplastic resin foam such as a foam body or other thermoplastic resin foam.