JPH02286206A - Composite panel - Google Patents

Abstract

PURPOSE:To form a high performance coating layer having durability by adhering and laminating insulating high strength fiber prepreg on the surface of a metallic panel. CONSTITUTION:Although glass fibers and aramid fibers are shown for insulating fibers, the glass fibers are advantageous in the anti-wearing property and profitability. The use of such insulating fibers is to prevent it from being a corrosive battery source, and strands in which a number of fibers converge thereon are oriented in one direction, or woven as fabrics, and then resin is infiltrated therein for forming prepreg. Epoxy, unsaturated polyester and polyim ide are cuted as resin to be infiltrated herein. For sticking prepreg on a metallic panel, it can readily be carried out by means of rolls or dies, and after sticking, it should be cured at an ordinary temperature; however, the adhesion, physical properties as well as productivity are improved through heating by an ordinary method.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a composite panel mainly used as a metal form for concrete casting.

[Prior Art] The panels conventionally used for the above purposes are those made of steel plate with a flange on one edge, those made of painted steel, those made of stainless steel, those made of glass fiber reinforced resin, etc. be. These have advantages and disadvantages in terms of strength mainly on the main surface, corrosion resistance, high surface quality, durability, ease of disposal, and cost. Products made of steel sheets coated with hard powder coating are said to meet the above requirements in a well-balanced manner, but the durability of the coating film is not fully satisfactory.

[Problems to be Solved by the Invention] The key to satisfying various characteristics lies in the use of composite materials, but the present inventors are aiming to create a main surface of a panel base made of inexpensive and high strength steel plate.
The aim is to provide a high-performance coating layer, and candidates for the coating material include improved coatings and dissimilar metal foils. but,
With the former, it is difficult to obtain high quality within the scope of painting, and with the latter, the problem arises that corrosion of base metals is accelerated due to the battery structure consisting of the base and coating material.

[Means for Solving the Problem] The first invention of the present invention is a composite panel characterized in that an insulating high-strength fiber prepreg is adhesively laminated on the surface of a metal panel, and the second invention is a composite panel characterized in that an insulating high-strength fiber prepreg is adhesively laminated on the surface of a metal panel. The subject matter is a composite panel characterized by adhesively laminating dissimilar metal foils on the surface of the composite panel via an insulating high-strength fiber prepreg.

[Function] The metal panels covered by the present invention include those made by folding the periphery of a steel plate or the like to provide a flange, and adding reinforcing ribs as necessary, and those made of aluminum cast into a similar shape. can be exemplified.

Examples of insulating fibers include glass fibers and aramid fibers, but glass fibers are advantageous in terms of scratch resistance and economy. The purpose of using insulating fibers is to prevent them from becoming a source of corrosion batteries. Prepreg is a strand in which a large number of these fibers are bundled together in one direction or made into a fabric, impregnated with resin, and left to wait for curing. Examples of the resin to be impregnated include epoxy, unsaturated polyester, and polyimide.

The prepreg used in the present invention may be semi-cured prepreg produced in a factory, or in the process of manufacturing the product of the present invention,
The former may be made by impregnating a reinforcing fiber fabric with resin, and the former is suitable in that the basis weight of the resin is uniform and not too much, but the latter is easier to store.

The prepreg can be easily attached using a roll or die. After pasting, it may be cured at room temperature, but adhesion, physical properties, and productivity are improved by heating in a conventional manner.

The lamination of insulating reinforcing fiber prepreg protects the panel from corrosion, but unlike simple painting, the presence of reinforcing fibers makes it resistant to scratches and bruises, so the appearance and surface quality do not change over time. . Furthermore, by selecting the prepreg fiber arrangement and weaving pattern,
The surface texture can be arbitrarily selected, and properties advantageous for concrete casting can be obtained.

The second invention further laminates different types of metal foils. Although the metal type of the foil used in the second invention is arbitrary, stainless steel is suitable since it can achieve high surface quality at the lowest cost. Although the thickness of i is not limited, a preferable range is 50 μm or more in terms of stamping resistance, and 200 μm or less in terms of workability at edges and other parts.

The prepreg and metal foil can be attached all at once, but it is better to first attach the prepreg to the metal panel base, then attach the metal foil to this surface, and then cure the resin to prevent air bubbles from getting trapped. It is easy to avoid, and the finished surface has excellent flatness. In addition, when pasting the metal foil, it is preferable to perform operations such as preliminary straightening or pasting while applying tension depending on the flatness of the metal foil material.

Also in the present invention, as in the first invention, a panel is used.

is protected against corrosion and has a more durable surface quality than the first invention product. Therefore, it is suitable for realizing fine texture such as S surface, matte surface, and pear surface.

In addition, compared to simply pasting the foil with adhesive, the thickness of the adhesive is more uniform, so the appearance after pasting is better, and the presence of hard reinforcing fibers under the foil makes it easier to bond the foil. Less likely to cause marks. Further, the panel base and the metal foil are isolated by the insulating fibers, and no corrosion battery circuit is formed.

In addition, for both the first invention product and the second invention product, the prepreg or metal foil may be attached only to the main surface of the panel.
Alternatively, the pasting may extend to the side surfaces of the panel.

[Example] Width 300mm, length 1500mm, height 30mm on 4 sides
It has a flange of mm in diameter, and a plurality of reinforcing ribs are also provided in the center.

A product was manufactured by applying the following coating to a metal form for concrete casting made of mild steel plate.

A00 Invention 1 A prepreg impregnated with epoxy resin was pasted on a plain weave glass cloth with a thickness of 0.2 mm and a basis weight of 270 g/m'' using a roll, and a 10 mm width was also folded and pasted on the long sides of the metal form. Thereafter, it was heated at 130° C. for 60 ml to obtain a first invention product of the present invention.

A', Comparative Example 1 Painting was performed with an epoxy resin powder coating (Pigment Man) so that the resin basis weight was the same as in the above example.

B00 Invention 2 A prepreg of the same quality as Example A with a thickness of 0.2cm-1 and a basis weight of 270g/m was pasted in the same manner as Example A, and further a prepreg with a thickness of 10
Paste 0μ SUS 304 mirror stainless steel foil,
The long sides were folded back and heat-cured to obtain a second invention product of the present invention.

B', Comparative Example 2 8 cases were pasted using 270g/m instead of prepreg.
This was done using epoxy adhesive.

Among the above examples, when products A and B of the present invention were used for concrete casting, the plain weave texture of example A and the mirror surface of example 8 were transferred well, and a concrete surface with excellent appearance was obtained.

In addition, when the products of each example including the comparative example were used repeatedly for half a year, no damage related to appearance or adhesion was observed in the products of the present invention in Examples A and 8, but in Comparative Example A' In Comparative Example B', there were scratches caused by scratching, and in Comparative Example B', there were indentations that appeared to be caused by scratching, confirming the superiority of the product of the present invention.

In Comparative Example B', some pitting corrosion of the steel panel was observed near the edges of the coating.

[Effects of the Invention] The present invention solves the problems in conventional similar approaches by applying a novel composite structure in which an insulating high-strength fiber prepreg is attached to the surface of a metal panel either alone or in a layered manner with different metal foils. It was possible to eliminate all points. This makes it possible to economically achieve high surface quality and durability for panels, and improves the efficiency of use and expands the range of applications for panels for various purposes, not just metal forms for concrete. Ta.

In addition, if the panel of the present invention is used for a long period of time, for example as a metal form for concrete casting, and the surface coating needs to be renewed, forced peeling will be rather easy due to the presence of adhesive layer reinforcing fibers, and peeling will occur. Afterwards, it can be re-coated with a light amount of plasting.

Patent applicant: Nippon Steel Corporation Daiichi Koshuha Industries Co., Ltd.

Claims (2)

[Claims] (1) A composite panel characterized by adhesively laminating insulating high-strength fiber prepreg on the surface of a metal panel. (2) A composite panel characterized by adhesively laminating dissimilar metal foils on the surface of a metal panel via an insulating high-strength fiber prepreg.