JPS5936587B2 - Manufacturing method of composite board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is capable of manufacturing a composite plate in which a heat insulating material such as polyurethane foam (hereinafter simply referred to as foam) is filled between a base material, particularly a metal plate made of a material such as a good conductor, and a sheet-like material. It also concerns the law.

More specifically, the present invention relates to a method for manufacturing a composite board that significantly improves the adhesion between the base material and the foam. In general, polyurethane foam has excellent self-adhesive properties, excellent heat insulation properties and processability, and is lightweight.

Various composite plates and other members are manufactured using this characteristic. However, during manufacturing, foam raw materials are layered on a steel plate, a sheet-like material is placed on top of the foam material, and the material is heated.
In composite plates that are integrated under pressure, peeling phenomenon is often observed between the adhesive surfaces, that is, the steel plate and the foam. The main reason for this is that the foam raw materials are mixed and come into contact with the steel plate in a creamy state, so the foam comes into contact with the steel plate surface at a temperature lower than the liquid temperature during foaming, slowing down the polymerization reaction rate and completely polymerizing. This is thought to be because the reaction hardens before reaching , that is, the reaction ends midway through. This was revealed experimentally by comparing the adhesion strength during the process of mixing the foam raw materials -> cream time -> gel time -> rice time. In other words, as mentioned above, the steel plate and the foam raw material covered the area that required adhesive strength at the cream time, and the structure of the foam raw material at the bonding part was not in a state suitable for bonding. In particular, while the raw materials immediately after mixing require heat for reaction, the raw materials in the part that came into contact with the steel plate absorb heat from the steel plate, and that part becomes a structure in which isocyanate is simply hardened rather than urethane bonded. It is from. In order to improve these drawbacks, the present invention discharges liquid foam raw material into a sheet-like material that is easily permeable.
The adhesive strength of the foam raw material is brought into contact with the back side of the steel plate, which is directly influenced by temperature, when its adhesive strength is at its maximum.
This paper proposes a manufacturing method for composite plates that greatly improves the strength of composite plates.

Hereinafter, an embodiment of the method for manufacturing a composite plate according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an embodiment of a manufacturing apparatus used for carrying out the present invention, in which 1 is a steel plate, 2 is a sheet-like article, 3 is a raw material for polyurethane foam or polyisocyanurate foam,
4 is a heating and pressurizing device, 12 is a foam raw material feeder, 13
1 is a steel plate guide roller, and 14 is a sheet feeder.
To explain further, the steel plate 1 is zinc with high thermal conductivity:
, :Reminder: Edition 1:C2K. K2": The first thing is flexibility, or a material that the foam material 3 can easily penetrate.
Or materials with good adhesive properties, such as kraft paper, asbestos paper, asphalt loop ink, glass fiber, and waterproofing of these materials, or lamination of two of these materials, or pasting aluminum foil on one side of these materials. Use one type, such as one that has been prepared. Also, heating. Pressure device 1
Are driving wheels 5 and 6 and driven wheels? , 8 between the upper and lower endless sections 9
.
10 can be heated to 20 to 100°C. In addition, the mold 11 forms an entrance of the mold 11 when the upper and lower endless mold members 9 and 10 face each other, and dissolves the mold when the facing of the mold members 9 and 10 is resolved, which is continuously repeated. be. Further, the foam raw material feeder 12 appropriately mixes a polyol component, a polyisocyanate component, a catalyst, a foam stabilizer, a blowing agent, and a surfactant, and discharges the mixture onto the sheet material 2 by either the floss method or the conventional method. It is something to do. The guide roller 13 for the steel plate is disposed in front of the inlet 11a of the mold 1 to guide the steel plate 1 to the inlet Ila of the mold. A plurality of guide rollers 14a, 14b, and ... (two pieces in the figure), and changes the foam raw material 3 discharged onto the sheet-like material 2 from cream time to gel time, and at the gel time, it contacts the steel plate Ij at the mold entrance Ila. This is for setting. That is, the so-called moving distance, which is the time from when the foam raw material 3 is discharged onto the back surface of the sheet-like material 2 until the gel time is reached, is set. Next, the method for manufacturing a composite plate according to the present invention will be explained in detail. First, the heating and pressing device 1 is rotated at a speed of 30 m/min in the direction of the force indicated by the arrow, and the inside of the mold 11 is heated to 60°C.

In addition, as the steel plate 1, a color steel plate (plate thickness 0.27n),
The sheet material 2 was prepared by laminating aluminum foil onto kraft paper, and the foam material 3 contained a total of 50 parts by weight of polyol, 48 parts by weight of a blowing agent (Freon 11), a catalyst, a surfactant, and a foam stabilizer. A raw material with a gel time of 5 seconds was prepared, consisting of component A consisting of 2 parts by weight and component B consisting of polyisocyanate. The time required for the sheet-like material 2 to reach the position of the guide roller 14b from the discharge port of the foam raw material feeder 12 was set to be 5 seconds. Therefore, both the A and B components are mixed, and the foam raw material 3 immediately after being mixed from the foam raw material feeder 12 is
or is discharged onto the sheet-like material 2. Then, sheet-like material 2
As the liquid foam raw material 3 penetrates into the back side of the foam raw material 3, it gradually begins to foam while reacting, and the viscosity of the foam raw material 3 increases, and when it becomes stringy, it comes into contact with the steel plate 1 during the so-called gel time. and fed to the mold 11. The foam raw material 3 is foamed in the mold 11, passed through rice time, and is suppressed to a constant thickness that is thinner than free foaming, and sent out from the exit Ilb of the mold 11, where it is cut into regular lengths. By doing this, a composite board is obtained. In the cross section of the composite plate manufactured in this manner, the density of the foamed structure in the portions of the foam near the steel plate 1 and the sheet-like material 2 was high, and the density of the foamed structure became lower toward the center. Therefore, a composite plate manufactured by the method according to the present invention and a conventional composite plate in which a foam raw material is laminated on a steel plate and a sheet-like material is laminated on top are manufactured under the same conditions and their strengths are compared. . That is, as shown in Fig. 2, the foam raw material is brought into contact with the back surface of the steel plate A which is not subjected to surface treatment during the gel time and cream time, and after the reaction and foaming are completed, the free foaming surface is cut, and the epoxy resin is applied thereto. The same steel plates as above were bonded via C. Note that the thickness of the foam D was 5 mm, and the density was 0.035 mm. Therefore, when steel plates A and B are pulled in the direction of arrows A and B, their tensile strength is 4 to 10 kg for the test piece according to the present invention.
/d) In the conventional example, it was 1 to 1.5 kg/CfIL.
As described above, according to the method of manufacturing a composite plate according to the present invention, the form can be effectively manufactured by simply selecting the manufacturing method, that is, the timing of contact between the steel plate and the form, while using conventional equipment, etc. A major feature is that it is possible to obtain a composite board with sufficient adhesive strength and a foam structure that is more preferable as a sandwich board as described above.

Furthermore, the foam raw material effectively utilizes its physical properties for sheet-like materials to sufficiently penetrate the fiber tissue during liquefaction, and then forms a foam using this as a base, that is, the fiber tissue as a foundation, For steel plates with poor external strength and adhesive strength, so-called impermeable materials and materials with good thermal conductivity,
There is an advantage in that it is possible to manufacture a composite board in which both the two materials are fixed by strong adhesive force by fully utilizing the self-adhesive force of the foam itself without giving too much consideration to the material.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing the configuration of an example of an apparatus used to carry out the composite board manufacturing strength method according to the present invention, and Fig. 2 is an explanatory diagram for testing the adhesive strength of the composite board manufactured according to the present invention. It is. 1... Steel plate, 2... Sheet-like material, 3.
... Foam raw material, A ... heating and pressurizing device, U ... sheet-shaped material delivery machine.

Claims (1)

[Claims] 1. Endless shapes are arranged vertically at the thickness interval of the composite plate, and a mold is formed at the entrance and the mold is released at the exit. A sheet feeder is provided with a guide roller for guiding the steel plate into the mold, a sheet material is attached to the upper blade of the upper mold material, and the sheet material is guided to the mold entrance via a plurality of guide rollers; When manufacturing a composite plate using a device equipped with a foam raw material feeder that discharges polyurethane foam raw material onto the back side of a sheet-like material in the middle of the material delivery machine, the sheet-like material from the discharge port of the foam raw material feeder to the mold inlet is A method for producing a composite plate, characterized in that the moving time of the object is set to correspond to the gel time of the polyurethane foam raw material, and the raw material, which has become gelatinous at this point, is brought into contact with the back surface of the steel plate.