JPS6225488A - Metal foilled metal substrate and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a printed circuit board for a motor used in electronic equipment, etc., and particularly relates to a metal foil-clad metal board using a silicon steel plate board and a method for manufacturing the same. It is.

(Prior Art) In recent years, electronic devices have rapidly become smaller, lighter, thinner, and more densely packaged. This kind of influence is also appearing in printed circuit boards, and similar demands are becoming stronger.

Conventionally, stator boards for motors have been made by laminating separate steel plates and printed wiring boards, but recently iron plate boards with printed wiring directly on the steel plates have become popular. Furthermore, in the case of motors that require higher magnetic flux density and hysteresis characteristics, a substrate using a silicon steel plate with a high silicon content is used.

Since this silicon steel plate has extremely poor corrosion resistance and weather resistance, it is usually obtained with anti-corrosion treatment applied to both sides of the plate.

Conventionally, in order to manufacture a printed wiring board by pasting metal foil on a silicon steel plate through an insulating layer, the surface treatment protective layer (hereinafter referred to as the protective layer) of the silicon steel plate is made of an inorganic material such as zinc. Those that were plated or coated were used. In this case, if a synthetic resin insulating agent is applied directly to the mineral-treated protective layer, the adhesive strength between the mineral-treated protective layer and the insulating layer will not be sufficient, and when cutting or punching, the silicon steel plate and the mineral-treated protective Peeling and cracking were observed at the interface between the layers. For this reason, it was necessary to completely remove the inorganic-treated protective layer on the surface to which the insulating agent was applied, and then apply the insulating agent to the surface of the silicon steel plate that did not have the inorganic-treated protective layer. However, in order to remove this inorganic treated protective layer, a special method is used, or regular polishing methods such as sandblasting and separate cloth polishing require repeating the process several times or requiring longer and larger equipment. There was a need.

(Problems to be Solved by the Invention) The present invention solves these drawbacks by using a silicon steel plate having a protective layer on both sides made of a mixture of synthetic resin and inorganic material. A metal foil whose protective layer can be easily peeled off during grinding processes such as separate cloth polishing, and whose insulating layer adheres well to the silicon steel plate to prevent peeling or cracking caused by impact during cutting or punching. The present invention provides a stretched metal substrate and a method for manufacturing the same.

(Means for Solving the Problems) That is, the present invention has the following steps: 1. A synthetic resin and inorganic substance mixture protective layer, a silicon steel sheet layer, a synthetic resin and inorganic substance mixture partial protective layer, an insulating layer, and a metal foil layer are formed in this order. A protective layer made of a mixture of a synthetic resin and an inorganic substance is provided on both sides of a 2° silicon steel plate laminated with a substrate, and one side of the protective layer is at least partially polished to form a synthetic resin containing an inorganic filler. It is characterized by a manufacturing method in which it is coated to form an insulating layer and then a metal foil is attached to the top surface.

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a cross-sectional view showing a substrate of the present invention, a silicon steel plate 1
A protective layer 2 is adhered to the bottom surface.

A protective layer 2 is also adhered to the upper surface of the silicon steel plate 1, and the protective layer 2 on the upper surface is partially polished to expose the silicon steel plate 1. Further, the insulating layer 3 coats the upper surface protective layer 2 and at the same time is firmly adhered to the exposed silicon steel plate 1, and the copper foil 4 is tightly adhered to the other surface.

The insulating material of the insulating layer 3 is made of a mixture of synthetic resin and inorganic filler, and the synthetic resin is a thermosetting resin such as epoxy resin, phenol resin, polyimide resin, unsaturated polyester resin, and epoxy-modified silicone resin. Examples of the inorganic filler include silica, clay, alumina, magnesium oxide, aluminum nitride, silicon carbide, and pyrone nitride. A curing agent for the synthetic resin was added to one or more selected from these synthetic resins and one or more selected from these inorganic fillers, and then mixed and kneaded to prepare an insulating agent.

On the other hand, the silicon steel plate 1 is made of a mixture of synthetic resin and inorganic material as the protective layer 2, and the silicon steel plate 1 and its protective layer 2 have characteristics that can withstand impact during cutting or punching. Co., Ltd., electrical steel sheet L-coating and L
2-coating, a product manufactured by Kawasaki Steel Corporation, and an electrical steel strip A1 coated product are preferred. And this protective layer 2
If necessary, the silicon steel plate 1 having the above-mentioned properties is cleaned with an aqueous surfactant solution or an organic solvent such as toluene or trichlene, and then only one side on which the insulating layer 3 will be formed is sandblasted,
Grinding and surface roughening were performed using separate cloth polishing, sandpaper, etc. In this case, the protective layer 2 of the silicon steel plate 1 may remain partially, and it is not necessarily necessary to completely remove the protective layer 2 to the extent that the original plate of the silicon steel plate 1 is exposed.

An insulating agent made of synthetic resin containing an inorganic filler is applied to the ground surface of the silicon steel plate 1 to a thickness of 40 μm to 200 μm to form an insulating layer 3, and a metal foil 4 is pasted on the top surface of the insulating layer 3. be. The metal foil 4 is usually 0.009 to 0.
-15 mm thick copper foil, aluminum foil, nickel foil, etc. can be used.

(Example) Examples of the present invention will be shown below.

Example 1 50 volumes of aluminum powder and an amine curing agent were added to 50 volumes of epoxy resin, mixed and kneaded to prepare an insulating agent. On the other hand, after degreasing and cleaning a silicon steel plate (manufactured by Nippon Steel Corporation, product name: electromagnetic steel sheet L-coating, manufactured by Nippon Steel Corporation) with a protective layer formed on both sides, which is made of a metal resin and an inorganic substance, one side was polished using a separate cloth polishing machine. The protective layer was polished. At this time, on the polished surface, the bare surface of the 80-inch silicon steel plate was visible in a mottled manner, and 20% of the protective layer remained.

The prepared insulating agent was applied to the polished surface using a roll coater to a thickness of 80 μm to form an insulating layer. Thereafter, a 65 μm electrolytic copper foil was laminated and heated and cured in the open to create a copper-clad silicon steel plate substrate.

The physical property evaluation is shown in the table.

Example 2 To 60 volumes of phenolic resin, 40 volumes of silica and an amine curing agent were added, mixed and kneaded to prepare an insulating agent. On the other hand, after degreasing and cleaning with an alkaline surfactant a silicon steel plate (manufactured by Yoichisaki Steel Co., Ltd., trade name: A1 coating), in which the protective layer region formed on both sides is made of poison Fubekheirin resin and inorganic substances, one side The protective layer was polished by sandblasting. At this time, on the polished surface, the bare surface of the 60-inch silicon steel plate was visible in the form of speckles, and the rest was a protective layer.

The prepared insulating agent was applied to the polished surface using a roll coater to a thickness of 100 μm to form an insulating layer.

Thereafter, a 65 μm electrolytic copper foil was laminated thereon and heated and cured in the open to create a copper-clad silicon steel plate substrate.

The physical property evaluation is shown in the table.

Comparative Example 1 An amine curing agent was added to an epoxy resin, mixed and kneaded to prepare an insulating agent. On the other hand, a silicon steel plate having a galvanized inorganic layer on both sides was degreased and cleaned with trichloride, and then polished by passing it through a separate cloth polisher six times to completely remove the galvanized inorganic layer on one side.

The prepared insulating agent was applied to the polished surface using a roll coater to a thickness of 80 μm to form an insulating layer. Thereafter, a 35 μm electrolytic copper foil was laminated, and after heating and curing in an open setting, a copper-clad silicon steel plate substrate was created.

The physical property evaluation is shown in the table.

Comparative Example 2 An amine curing agent was added to an epoxy resin, mixed and kneaded to prepare an insulating agent. On the other hand, a silicon steel plate with galvanized inorganic layers on both sides was degreased and cleaned with trichloride, and then a blended insulating agent was coated on one side with a roll coater to a thickness of 80 μm.
m was applied to form an insulating layer. Thereafter, a 35 μm electrolytic steel foil was laminated and heated and cured in the open to create a copper-clad silicon steel plate substrate.

The physical property evaluation is shown in the table 1. Drop impact test measurement method The test method is 4 4 mt X68 obtained in Examples and Comparative Examples.
Four copper blocks measuring 16 meters x 13 meters x 2 meters were attached to a board at the bottom using solder, and the copper blocks were dropped face down onto a 30 meter thick oak wooden board with a height of 75 am. evaluated.

2. Punching workability The copper-clad silicon steel plate substrates obtained in Examples and Comparative Examples were cut with a shear, and peeling and cracking of the insulating layer and protective layer at the cut portions were observed.

(Effects of the Invention) In view of the above results, the embodiments of the present invention require less surface polishing steps on the surface of the protective layer, and can be applied to ordinary lines as they are. In addition, the drop impact resistance is good and the cutting workability is also excellent, indicating that the adhesion and adhesion between the insulating layer, the silicon steel plate, and the protective layer are good.

As described above, according to the present invention, a highly reliable metal foil-clad silicon steel plate substrate can be manufactured using a normal production process, and a complex-shaped circuit wiring silicon steel plate substrate for processing a board or for a motor can be manufactured. It can be punched out without damage.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the metal substrate of the present invention, and FIG.
a) and (b) are a cross-sectional view and a plan view of a drop impact test sample. Code 1...Silicon steel plate 2...Protective layer in the present invention 3...Insulating layer 4...Copper foil 5...Silicon steel plate substrate

Claims (2)

[Claims] (1) A metal foil cladding characterized by being formed by sequentially laminating a protective layer made of a mixture of synthetic resin and an inorganic substance, a silicon steel plate layer, a partial protective layer made of a mixture of a synthetic resin and an inorganic substance, an insulating layer, and a metal foil layer. metal substrate. (2) A protective layer made of a mixture of synthetic resin and inorganic material is provided on both sides of a silicon steel plate, and one side of the protective layer is at least partially polished and a synthetic resin containing an inorganic filler is applied to form an insulating layer. 1. A method for producing a metal foil-clad metal substrate, which further comprises bonding a metal foil to the upper surface of the substrate.