JPS5929424B2 - sandwich panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a sandwich panel using a honeycomb structure and a core material.

Generally, honeycomb structures are known as lightweight structures with relatively high mechanical strength, and are widely used as construction members.

However, since the honeycomb structure has extremely large voids, it has poor heat insulation properties and can only be expected to have low performance, which is hardly a problem in terms of fire protection. Further, the conventional bonding structure between the honeycomb structure and the plate material had a disadvantage of lacking adhesive strength because the contact area was small. In addition, this fixing work is extremely complicated and requires precision, which is a major cause of high costs. A sandwich panel that solves the drawbacks of the object of the present invention, is stronger, cheaper, has excellent insulation properties under normal conditions and under high heat, and exhibits outstanding fire resistance under high heat.
(hereinafter simply referred to as a panel). EMBODIMENT OF THE INVENTION Below, the panel based on this invention is demonstrated in detail using drawing. FIG. 1 is an enlarged cross-sectional view showing a part of the cross-section of a panel according to the present invention. In the figure, 1 is a honeycomb structure (hereinafter simply referred to as honeycomb), which is made of one type of asbestos paper, thin metal plate, ceramic paper, etc.
It mainly functions as a core material, a member for accommodating fireproof particles to be described later, and a surface to which a synthetic resin foam is adhered. 2 is a plate member made of a non-combustible hard base material, and a part of the synthetic resin foam 3 is compressed to form a film on the end face of the opening surface of the honeycomb 1, and is integrally assembled as shown in the enlarged view in Fig. 2. The material is one or more of noncombustible materials such as metal plates, gypsum boards, and calcium silicate plates.

In addition, synthetic resin foam 3 (hereinafter simply referred to as foam)
The honeycomb 1 and the plate member 2 are bonded and integrated in the state shown in FIG. 2, and the honeycomb 1 closes the opening of the hollow part 4 of the honeycomb 1, and functions as a heat insulating material and an adhesive. To explain further, the foam 3 is made of a foamed synthetic resin, such as one of polyurethane foam, polyisocyanurate foam, epoxy foam, area foam, and phenol foam. In addition, when forming the foam 3, the material is discharged onto the plate member 2 in a raw material state, and is fixed together through self-adhesion during reaction and foaming, and the foam is also formed.
5 is a fireproof granule, as extracted and shown in FIG. 3, the internal voids of an inorganic foam layer 6 (hereinafter simply referred to as foam granules) are impregnated with a foamable inorganic material 7 that forms an inorganic foam layer under high heat. It is.

To explain further, the foamed particles 6 are pearlite particles, bubble gas particles, shirasu balloons, calcined vermiculite, and other artificial aggregates, which are light and robust to some extent. Further, the foamable inorganic material 7 is, for example, sodium silicate,
Sodium metasilicate, sodium orthosilicate, sodium metaborate (
2, 4, 5, 6, 8) Sodium borate, (1st, 2nd, 3rd)
) Sodium phosphate, and a mixture of these two. Furthermore, the foamable inorganic material 5 has a general formula of
A composition in the range of x≦5 (x+y) is also effective. As a specific example, 80g of boron oxide, 70g of sodium hydroxide, 1
The composition is made up of 162 g of water, and the products are mixed and stirred. Next, an example of a method for manufacturing a panel according to the present invention will be described. Two typical methods for manufacturing the above-mentioned panel are a continuous method and a batch method using a mold. For example, a case will be explained in which the upper and lower mold members are manufactured continuously using double-width steel belts. First, as the plate member 2, a thin metal plate (thickness 0.27m0 is used), and a polyol (including a blowing agent, a foam stabilizer, and a catalyst) is applied on top of the thin metal plate (thickness 0.27m0)
An unfoamed polyurethane resin mixed with polyisocyanate and polyisocyanate is applied using a one-shot method. Next, the asbestos honeycomb 1 is placed and pressed onto this metal thin plate.
Thereafter, fireproof granules 5 are filled into the hollow portions 4 of the honeycomb 1.
On the other hand, unfoamed polyurethane resin is applied to the back surface of the plate member 2 laminated on the upper surface of the honeycomb 1, which is a so-called thin metal plate made of the same material as above, and when the raw material is cream thyme, the open surface of the honeycomb 1 is coated with unfoamed polyurethane resin. A second plate is placed between the honeycomb 1 and the plate member 2.
Press it so that it has the structure shown in the figure, and then heat it at 60°C.
All you have to do is cure it for about 3 to 5 minutes. As described above, according to the panel according to the present invention, since no foam layer is interposed between the honeycomb and the plate member, a highly accurate panel can be obtained.

Furthermore, since no foam layer is interposed between the plate member and the honeycomb, a panel with excellent dimensional stability can be obtained at all times.
This so-called feature is that there is no fear of dimensional changes due to subsequent secondary foaming. Furthermore, since the hollow portion formed by such a constituent material is filled with fireproof granules, it is characterized by high mechanical strength and sound insulation properties. In addition, in the event of a fire, the foamable inorganic material filled in the internal voids of the fireproof granules foams to form an inorganic foam layer, and then a fireproof layer consisting of an inorganic foam layer using the foamed granules as aggregate is formed. It has the characteristic of being able to protect the panel by producing sufficient heat insulation properties even under high heat.

[Brief explanation of drawings]

FIGS. 1 and 2 are longitudinal sectional views showing an enlarged part of the sanderch panel according to the present invention, and FIG. 3 is an explanatory view showing extracted fireproof granules. 1... Honeycomb structure, 2... Plate member, 3... Heat insulation and adhesive, 4... Hollow part, 5... Fireproof granules.

Claims (1)

[Claims] 1. In a sandwich panel in which a nonflammable, hard plate member is brought into contact with both open surfaces of a honeycomb structure, and the above-mentioned both open surfaces and the plate member are integrally formed with an adhesive interposed therebetween, the adhesive is used for both insulation and adhesion. It is formed of a synthetic resin foam that functions as an adhesive layer, and part of it is an adhesive layer with a film-like thickness between both end faces of the honeycomb openings and the plate member, and the other part is an adhesive layer in the hollow part of the honeycomb. A foamable inorganic material is swollen so as not to completely fill the hollow part formed by the honeycomb and the swollen synthetic resin foam, and an inorganic foam layer is formed under high heat in the internal voids of the inorganic foam particles. A sandwich panel characterized by being filled with fireproof granules impregnated with.