JPS6160772A - Method for processing metallic panel - Google Patents

Abstract

PURPOSE:To carry out bonding which is excellent in electrolytic corrosion- inhibiting effect, by using a structural acrylic adhesive contg. glass beads in bonding a metallic panel to a carbon fiber-reinforced plastic. CONSTITUTION:1-20wt% (based on the quantity of structural acrylic adhesive) glass beads having a particle size of 50-500mu made of soda-lime glass is added to the main component (A) of a structural acrylic adhesive, which consists of a mixture (a) obtd. by partially polymerizing methyl methyacrylate with styrene in the presence of polychloroprene, methacrylic acid (b) and a methyl methacrylate soln. (c) of an acrylate polymer. A hardener component (B) is then added thereto in a weight ratio of A to B of 20/1 to obtain a structural acrylic adhesive contg. glass beads. A metallic panel is bonded to a carbon fiber-reinforced plastic by using said adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for processing a metal panel, and more particularly, to a method for processing a metal panel, and more specifically, the present invention relates to a method for processing a metal panel, and more particularly, to a metal panel in which carbon fiber reinforced plastic (hereinafter referred to as carbon fiber reinforced plastic) is used as a reinforcing material.
This invention relates to a method of bonding FRP (FRP).

Prior Art and Problems to be Solved Conventional metal-only panels have limitations in structural applications, and to increase their strength, very thick metal panels must be used.

Therefore, if CFRP is bonded and reinforced to such a metal panel, the toughness and lightness of CFRP will contribute to increasing the strength and reducing the weight of the metal panel. However, metal and CFR
As for adhesion of P, the problem of electrolytic corrosion has traditionally been a bottleneck, making it difficult to put it into practical use. Here, "electrolytic corrosion" refers to electrolytic corrosion caused by stray current (stray current that wastefully flows through other than the intended path) or leakage current, such as electrolytic corrosion. Corrosion often occurs in electrolytic cells, pipes, or cables due to poor insulation or leakage current from the railway.

An object of the present invention is to provide a processing method that does not cause electrolytic corrosion when bonding the metal panel and CFRP.

As a result of intensive studies to achieve this objective, the inventors of the present invention discovered that if glass beads were added to a normal acrylic structural adhesive and used for the above-mentioned bonding, it would be possible to increase the number of parts to be bonded. The inventors have discovered that the above-mentioned electrolytic corrosion can be prevented, thereby effectively increasing the strength and reducing the weight of conventional metal panels, and have completed the present invention.

That is, the present invention provides a method for bonding CFRP to a metal panel using an acrylic structural adhesive, which is characterized in that glass beads are added to the adhesive.

As the acrylic structural adhesive in the present invention, acrylic adhesives that are generally applied to structures such as metals, synthetic plastics, glass, and ceramics may be used (Japanese Patent Publication No. 53-4528, 53-241
(Refer to Publication No. 03 and Japanese Unexamined Patent Application Publication No. 50-35231)
Specifically, 2, a mixture of methyl methacrylate and styrene partially polymerized in the presence of polychloroprene, b, methacrylic acid and C, a two-liquid component consisting of a methyl methacrylate solution of an acrylate polymer and a curing agent component. Examples include molds (see Japanese Patent Publication No. 53-4526). Such an adhesive is commercially available, for example, under the trade name "Toughlock" manufactured by Sunstar Giken Co., Ltd.

The glass beads used in the present invention may be beads made of ordinary soda glass, and the particle size thereof is usually 50 to 50.
0μ, preferably in the range of 150-300μ.

The metal panel processing method according to the present invention is characterized by adding glass beads to the above-mentioned acrylic structural adhesive and using this to bond the metal panel and CFRP. There are no restrictions on conditions such as curing temperature and time. The amount of the glass beads added is 1 to 20% (by weight) to the acrylic structural adhesive.
, hereinafter the same), preferably in the range of 2 to 10%. If it is less than 1%, the galvanic corrosion prevention effect cannot be obtained,
If it exceeds 20%, problems tend to occur, such as a decrease in adhesive strength and displacement during the bonding operation of overlapping after application of the adhesive.

According to the processing method of the present invention having the above-mentioned configuration, it is possible to effectively bond CFRP as a reinforcement material to a metal panel without causing electrolytic corrosion, and the obtained modified panels can be used for example on ladders, tank bridges, etc. Useful for materials.

Next, the present invention will be explained in more detail with reference to Examples and Comparative Examples.

Example 1 General soda glass with a particle size of 250μ is added to the main ingredient of acrylic adhesive (Toughlock Magnetic 6201) with 5% Rusby finish.
Contains a curing agent component (Toughlock curing agent T-
5) at a ratio of 20:1 to prepare an adhesive.

Using this adhesive, attach a metal panel (aluminum plate, 1.
6am thick x 25 cod width x 100ff length) sandwiched with CFRP (trading card molded board made by Toshi ■) to make 12.5 sam.
A wrapped and bonded shear test piece is prepared. The obtained modified Evanel was subjected to a test, and the results are shown in Table 1.

Comparative Example 1 Added Ebanel was obtained in the same manner as in Example 1 except that one glass bead was not added, and the test results are shown in Table 1.

Table 1 Note ■) Shear adhesive strength: Measured at a crosshead speed of 5°/min.

■) Fatigue test: Universal fatigue tester (UF15 manufactured by Shimadzu Corporation)
00), the number of cycles until the aluminum plate breaks was measured at a load of 8s15+2.1800 cycles/min.

■) Corrosion test: Visual judgment after immersion in water for 3 months. ○ indicates that no abnormality is observed on the adhesive surface of the aluminum plate, and × indicates that a corrosion phenomenon is observed on the adhesive surface of the aluminum plate, as if the aluminum plate had melted and eluted.

Claims (1)

[Claims] 1. A method for bonding carbon fiber reinforced plastic to a metal panel using an acrylic structural adhesive, the method comprising adding glass beads to the adhesive. 2. The method according to item 1 above, wherein the glass beads have a particle size of 50 to 500μ. 3. The method according to item 1 above, wherein the amount of glass beads added is 1 to 20% by weight.