JPS62176837A - Manufacture of metallic-base copper-lined laminated board - 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 Field of Application] The present invention relates to a method for manufacturing a metal-based steel-clad laminate with excellent adhesion.

[Conventional technology]

In recent years, electronic devices have become lighter, thinner, and more dense, and as the electronic components used in these devices have become more densely mounted, the amount of heat generated per unit surface area11 has been steadily increasing. 7514J with excellent heat resistance and heat dissipation is also in demand.

In recent years, aluminum has been used as a material that satisfies the demand for lightness.

Printed circuit boards based on metal plates such as copper or iron have come into use.

In particular, for small electronic motors, printed circuit boards incorporating rotation speed and position detection circuits are usually made of cold-rolled steel sheets or silicon steel sheets with good electric a% properties. .

However, these steel plates have poor corrosion resistance and are susceptible to rust, especially in summer or high humidity, so their surfaces are usually plated with zinc or aluminum and sold as galvanized steel plates or aluminized steel plates. Galvanized steel sheets are also coated with chromate treatment to prevent white rust, and those coated with a phosphate film to improve adhesion to paint.

[Problem that the invention seeks to solve]

When using these galvanized steel sheets as a base for printed circuit boards, the galvanized steel sheets, which have been subjected to paint-type chromate treatment on the galvanized surface, have poor adhesion with the insulating layer, and are particularly difficult to resist moisture and heat. When subjected to tests such as PCT (Pressure Test) or immersion in water, the insulating layer tends to peel off from the metal plate. In addition, galvanized steel sheets with a phosphate coating have good adhesion to the insulating layer, but they are easily scratched and are less corrosion resistant than the paint-on chromate-treated ones, resulting in rust. Easy to do.

Even when an aluminized steel plate is used, there are problems such as poor adhesion between the metal plate and the insulating layer, such as peeling and swelling.

The present invention was made in view of the above situation, and provides a method for manufacturing a metal-based copper-clad laminate board in which the close contact between the plated steel sheet and the insulating layer is improved.

Means for Solving Problem C] According to the present invention, the object is to form a chromate coating on the surface of a galvanized or aluminized steel sheet using a chromate-based or chromic acid-phosphate-based conversion coating agent. This is achieved by depositing a copper foil on top of it via an adhesive insulating layer without removing it.

The galvanized steel sheet used in the present invention is cold rolled fl
! 48i! These are ordinary iron plates such as A-rolled copper plates, as well as silicon copper plates with excellent electromagnetic properties, and are coated with zinc or zinc as a main component, and plated or barbed, and laminated. On top of this zinc plating, a coating type chromate treatment or phosphate treatment may be applied to further improve corrosion resistance.

An aluminized steel plate is a steel plate that is made of aluminum and is plated with chamfers or jaws on the above-mentioned ordinary iron plate.

The above-mentioned chromate-based or aluminum acid-phosphate-based chemical conversion coating treatment applied to the surface of zinc or aluminized steel sheets is called the alodine method, which is generally used for aluminum surface treatment, and is CrOs/F''. ” series, CrOs/F
There are "''/CN- series, PO";/Cr03/F- series, etc.

The chromate treatment may be carried out under known treatment conditions.
For example, P Q3. -/Cro 3/F- system, P□
S, - is 20-100 g/j, r is 2-6 g/l.

CrOs is 6-20 g/l, treatment conditions are 20
What is necessary is just to process at 60 degreeC for 1S-5 minutes. Immediately after the treatment, it is washed with water and dried to form a conversion coating 11# of Ωmate.

Note that it is desirable to degrease before performing the chemical conversion coating treatment. Suitable degreasing liquids are alkaline and solvent types such as trichlene and freon.

The contact insulating layer used in the present invention is made of resin such as epoxy resin, phenol resin, unsaturated polyester resin, or polyimide resin. Various curing agents, rubbers, pigments, coupling agents, etc. may be added to these resins. A solution of the above resins may be applied to copper foil or a steel plate that has undergone the above treatment, or these resins may be mixed with glass fibers or polyester. Made of adhesive prepreg sheets reinforced with base materials such as fibers and paper,
Copper foils are laminated via these resins and heated and pressed to produce a laminate. Note that a laminated press is usually used as the pressing method, but a continuous pressing steel belt or roll press may also be used.

The present invention will be explained in detail below based on examples.

implementation? Although IJ has shown an example in which steel foil is bonded to one side, it may be bonded to both sides.

[Example 1] After degreasing a commercially available electrogalvanized steel sheet (SECC), which is a 5 pcc plate with a thickness of 1 mm and galvanized with a zinc-coated S amount of 20 g/mold, PO! ″″:CrO3:F-: 8
20 was immersed in the phosphorus 1-chromate system in a ratio of 40:10:50:1000 (weight ratio). The processing conditions were 50° C. for 1 minute. After that, immediately wash with water,
Drying was carried out at 0°C to form a chromate reflection. In addition, epoxy resin was applied to 65μ copper foil, dried, and 80μ
A copper foil with an insulating layer of
A single-sided copper-clad laminated pigeon board was obtained by heating and pressurizing the product in an acid form under the conditions of Hr.

[Example 2] Zinc adhesion 1120 g/rrf on 5PCC with plate thickness 1 mm
After degreasing a commercially available electrogalvanized steel sheet that has been subjected to a chromate treatment of 25 fQg/m,
Commercially available chromate-based conversion coating agent (Alodin 1000:
Nippon Paint ■) 0.075% aqueous solution for chromate treatment.

The treatment conditions were 50°C for 40 seconds. Thereafter, it was immediately washed with water and dried at 80°C to form a chromate film. Using this steel plate, a single-sided copper-clad laminate was obtained in the same manner as in Example 1.

[Example 3] Degreasing was carried out on a commercially available electrogalvanized silicon copper plate, which had a zinc coating amount of 20 g/misaki on a silicon steel plate with a thickness of o, s mm, and a zinc phosphate treatment l/A5 g/rrf applied thereon. After that, chromate treatment was performed in the same manner as in Example 2, and a single-sided steel-clad laminate was obtained in the same manner as in Example 1.

[Example 4] After degreasing a commercially available aluminized steel plate with a thickness of 1 mm, a commercially available chromate-based conversion coating agent (Alodine #
1000) Chromate treatment was performed by immersing it in a 0.1% water bath solution. The treatment conditions were 50°C for 1 minute. Immediately thereafter, it was washed with water and dried at 80°C to form a chromate film, and a single-sided copper-clad laminate was obtained in the same manner as in Example 1.

[Comparative Example 1] The commercially available electrogalvanized steel sheet used in Example 2 was degreased without being subjected to chromate conversion coating treatment, and then a single-sided steel clad laminate was produced in the same manner as in Example 1.

[Comparative Example 2] A single-sided copper-clad laminate was obtained directly from the commercially available electrogalvanized copper plate used in Example 3 in the same manner as in Example 1 without applying the chromate conversion coating treatment.

[Comparative Example 3] Implementation f! A single-sided steel clad laminate was obtained directly from the commercially available aluminized steel plate used in Example 14 in the same manner as in Example 1 without applying the chromate conversion coating treatment.

[Comparative Example 4] One side of the commercially available electrogalvanized steel sheet used in Example 2 was roughened with #180 sandpaper, and a single-sided steel clad laminate was obtained in the same manner as in Example 1.

The following tests were conducted on the copper-clad laminates obtained in Examples 1 to 4 and Comparative Examples 1 to 4, and the results are shown in Table 1.

(1) Withstand voltage: According to JIS C2110 (D, C
, ) (2) Solder heat resistance: Compliant with JIS C6451.

Evaluation at 500°C for 1 minute: O: No abnormality, ×: Blistering (37 PCT (pressure shoe test): 121
°C, in a steam atmosphere of 2 atm O: No peeling of the insulation layer, ×: Peeling of the insulation layer (4) Boiling test: Immersion in boiling water ○: No peeling of the insulation layer, ×: Peeling of the insulation layer (support) (2) to (4) ) The test was conducted after removing the copper foil from the single-sided copper-clad laminate by etching.

Blank space below [Name of the invention] As is clear from the results shown in Table 1, the pressure of the present invention is a metal-based copper-clad laminate that has excellent voltage resistance and heat resistance, as well as excellent adhesion of the insulating layer. It is now possible to provide boards.

Claims (1)

[Claims] 1. A chromate film is formed on the surface of a galvanized or aluminized steel plate using a chromate-based or chromic acid-phosphate-based chemical conversion coating agent, and a copper foil is placed on top of this through an adhesive insulating layer. A method for manufacturing a metal-based copper-clad laminate characterized by lamination.