JPS61261553A - Panel - 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 [Field of Industrial Application] The present invention relates to a panel used for a floor panel or the like, which is formed by fixing a carbon fiber reinforced cement board and a metal plate.

[Conventional technology]

As shown in Japanese Utility Model Application Publication No. 59-63126,
Composite floor panels made by bonding lightweight and high-strength carbon fiber-reinforced cement boards and metal plates have improved rigidity compared to floor panels made of carbon fiber-reinforced cement alone.
It has advantages such as less corner chipping in exposed cement areas.

Usually, an epoxy-based or urethane-based resin adhesive is used to bond the carbon fiber-reinforced cement board and the metal plate.

[Problem that the invention seeks to solve]

However, this composite board made by bonding a carbon fiber-reinforced cement board and a metal plate is not found in ordinary cement boards.
There are no problems. This is a phenomenon in which corrosion of the metal (metal oxidation) is significant at the portion where the carbon fiber reinforced cement and the metal come into contact. According to research conducted so far, various causes interact with each other for this phenomenon, but the basic factors are thought to be as follows.N0 carbon fiber has good electrical conductivity;
The potential is as high as that of a precious metal, and when this carbon fiber comes into contact with a baser metal (usually iron/iron alloy, galvanized steel, aluminum, etc.), there is a galvanic potential. This is because panic batteries are formed and metal corrosion is accelerated.Therefore, metal corrosion can be prevented by interposing an electrical insulating layer between the carbon fiber reinforced cement board and the metal plate. As usual, the carbon fiber-reinforced cement board and the metal plate are fixed together with a resin adhesive, and the adhesive itself can rub against the insulating layer, but unevenness may occur on the carbon fiber-reinforced cement surface or the metal plate surface. Therefore, it is difficult to form an insulating layer using only an adhesive layer. In particular, many carbon fibers protrude from the surface of carbon fiber-reinforced cement, which binds the soft adhesive and forms a battery, causing metal corrosion (rust). The rust generated here spreads to the surrounding area, and the rust reduces the adhesive strength between the metal and the adhesive, making it no longer able to function as a composite board.

Therefore, in the present invention, corrosion of the metal plate is prevented by interposing an electrically insulating layer made of a non-conductive inorganic material with an electrical resistance of 100Ω or more between the carbon fiber reinforced cement board and the metal plate. [Means for Solving the Problems] To solve the above problems, the present invention aims to provide a durable, lightweight and high-strength panel. A panel formed by laminating and fixing metal plates to a surface with an elastic modulus (0.2 to 1.0), the carbon fiber-reinforced cement plate and the metal plate having an electrical resistance of 100Ω or more. The structure includes an electrically insulating layer made of a conductive inorganic material.

[Effect]

Floor panels made of carbon fiber-reinforced cement boards and metal plates are lightweight and have high strength, but as mentioned above, the metal plates are subject to severe corrosion when the carbon fibers come into contact with the metal plates. This is thought to be because a galvanic cell is formed there, which causes the metal plate to oxidize and corrode, which promotes the generation of rust from there. Therefore, in the present invention, the carbon fiber reinforced cement plate and the metal plate are An electrically insulating layer is interposed between the carbon fiber and the metal plate to insulate the carbon fiber and the metal plate. Therefore, oxidation and corrosion of the metal plate can be prevented, and a lightweight, high-strength, and durable floor panel can be obtained.

[Specific examples of the invention]

The present invention will be explained in more detail below.As shown in FIG. 1 and FIG. When stacking, an electrically insulating layer 3 such as cement mortar is interposed, and then the metal plates 2 are bonded together with an adhesive.

On the other hand, the metal plate 2 may be provided on one side of the carbon fiber reinforced cement board 1, or may be provided on this one side, and when it is provided on this one side and used as a floor panel, it may be provided on the bottom surface. Next, we will discuss metal plate corrosion of carbon fiber-reinforced cement boards, metal plates, and Σfloor panels while showing experimental results. Insert a carbon fiber and steel specimen into the chamber, and insert a potentiostat (using a saturated Amagi electrode, potential sweep rate 40 mv).
/M, counter electrode: platinum), the potential of each test material in cement was measured. Table 1 shows the measurement results of each potential.

Table 1 Potential of carbon fiber and steel in cement mortar (VMS
5CE) As is clear from Table 1, the potential in cement is much higher for carbon fibers than for steel specimens, and when steel and carbon fibers bond together, a galvanic cell is formed and corrosion may occur. It can be seen that the corrosion resistance is extremely high. Therefore, in order to prevent this corrosion, the present inventors conducted various studies and found that it is sufficient to form an insulating layer between the carbon fiber reinforced cement board and the metal plate.

That is, as a result of the inventor's experiments, a carbon fiber-reinforced cement board in which carbon fibers with an elastic modulus (0,2 to i, o) x 10'% of 0.2 to 5 vol % are dispersed in a cement matrix. It has been found that if the insulating layer interposed between the metal plate and the carbon fiber has a resistance of 100Ω or more, the corrosion current that forms a galvanic cell between the metal plate and the carbon fiber can be completely cut off.

In the present invention, any electrical insulating layer interposed between the carbon fiber-reinforced cement board and the metal plate can be used as long as it insulates both reliably. The material for forming the insulating layer is preferably a non-conductive inorganic material such as cement mortar, cement paste, a cement-based matrix mixed with inorganic fibers such as asbestos or glass fibers, and so on. Other materials such as ceramics, glass, and plaster can also be used.

When manufacturing the panel according to the present invention, as a first example,
The above-mentioned inorganic material is applied or sprayed on one or both sides of the cured carbon fiber reinforced cement board 10 and cured to form an insulating layer 3. After that, the metal plate 2 is bonded with an adhesive 4 such as epoxy or urethane. In this case, in order to improve the adhesive force between the carbon fiber reinforced cement board 1 and the inorganic material forming the insulating layer 3, the adhesive force can be strengthened by providing irregularities on the surface of the carbon fiber reinforced cement board. In addition, as another manufacturing example, when forming a carbon fiber reinforced cement board, the surface of the carbon fiber reinforced cement board is uncured (semi-hardened).
Alternatively, after hardening the carbon fiber reinforced cement board by disposing a hardened inorganic material, it may be bonded to the metal plate 2.
Furthermore, the hardened carbon fiber reinforced cement board 1 and the hardened insulating layer 3 made of an inorganic material are bonded together with an adhesive 4,
They may be laminated and the insulating layer 3 and metal plate 2 may be bonded together using an adhesive 4.

On the other hand, as the carbon fibers to be mixed into the carbon fiber reinforced cement board, carbon fibers having an elastic modulus of (0,2 to 1.0)XIO'\I are used. If the elastic modulus is small, the strength is insufficient,
In particular, the strength is insufficient as a floor panel, and even if it is too high, no strength improvement effect can be obtained.Moreover, highly elastic ones are expensive, and are unsuitable when considering the use of floor panels. Regarding the mixing rate, if the mixing rate is 0.2 to 5 vol % and it is less than 0.2 vol %, there will be insufficient strength, whereas if it exceeds 5 vol %, there will be crosstalk with cement-based materials. It's bad, and it's expensive.

The carbon fiber reinforced cement board of the present invention is made of cement
As long as carbon fiber is dispersed in J-wax, the presence or absence of aggregate such as sand or gravel, the amount thereof, or the presence or absence or amount of various additives and admixtures does not matter. The thickness is preferably 10 to 40 m for floor panel applications.As for the metal plate, in addition to steel plates, steel alloy plates, plated steel plates, or non-ferrous metal plates such as copper are used for floor panel applications. It is desirable that the material has a yield point of 10 or more and a thickness of 0.4 mm or more.FI730 [Examples and Comparative Examples] 18mm
An insulating layer 3 made of cement mortar having the composition shown in Table 3 is coated on both sides of the carbon fiber reinforced cement board 1 to a thickness of approximately 1 mm to a thickness of 20 nm, and a bare steel plate 2 is bonded with epoxy resin. to form the floor panels.

Table 2 (Carbon fiber-reinforced cement board composition) Table 3 (Comparative example) Similarly to the above example, the thickness of the carbon fiber-reinforced cement board 1 with a thickness of 2° in the second notation is 0. .8 mm steel plate 2 was bonded with epoxy resin 5 to form a shite floor panel (
(See Figure 3). During this bonding, carbon fibers were mixed into the epoxy resin so that the steel plate 2 and the carbon fibers were in contact with each other.

(Results) The floor panels obtained in the above Examples and Comparative Examples were subjected to a thermal cycle environment in the temperature range of 20°C to 80°C as shown in Figure 4.
A corrosion acceleration test was conducted by repeated heating and cooling. 4th result
Shown in the table.

Table 4 (Corrosion status due to repeated heating and cooling) ○: No corrosion ×: Red rust on steel plate Next, as shown in Figure 5, the floor panel P was placed on two pairs of support legs.
Further, a load 7 was placed on the floor panel P, and the relationship between the load and the amount of deflection was measured, and the 7Co results are shown in FIG.

As is clear from Table 4, no corrosion was observed in the floor panel of the example according to the present invention even after 10 cycles of repeated heating and cooling, and as shown in FIG.
After the cycle, the displacement of the floor panel becomes large under a small load.0 [Effects of the Invention] As described above, according to the present invention, it is possible to prevent oxidation corrosion of the metal plate, and it is lightweight, has high strength, and is durable. This makes it possible to obtain panels that are particularly suitable for floor panels.

[Brief explanation of drawings]

1 and 2 are panel sectional views showing examples according to the present invention, FIG. 3 are floor panel sectional views showing comparative examples, and FIG. 4 is temperature change diagrams for floor panel cold and hot cyclic corrosion tests. Figure 5 is a perspective view showing the test conditions for measuring the load and displacement of the floor panel, and Figure 6 is a diagram showing the relationship between load and displacement.0 1. Carbon fiber reinforced cement board, 2. Metal plate 3.・Electrical insulation layer 4... Adhesive layer Figure 1 Figure 2 Figure 3 Figure 5 Figure 6

Claims (1)

[Claims] (1) Elastic modulus (0.2~
1.0)×10^6kg/cm^2 carbon fiber by 0.2
A panel formed by laminating and fixing a metal plate to one or both surfaces of a carbon fiber reinforced cement plate dispersed at ~5 vol%, the electrical resistance between the carbon fiber reinforced cement plate and the metal plate being 100Ω. A panel characterized by interposing an electrically insulating layer made of the above non-conductive inorganic material.