JPH09302805A - Fire resisting panel reinforced with glass net - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire resisting panel which is excellent in lightness and fire resistance and whose core is highly adherent to surface plates. SOLUTION: This fire resisting panel has a core 3 of a resin blended with a pulverized inorganic fire retarder having water of crystallization and with pulverized boric acid, a glass net 4 with a mesh ranging from 3mm×3mm to 30mm×30mm, which is inserted into the core 3, and metallic surface plates 1, 2 laminated respectively over the front and back of the core 3. The expandable resin core 3 is manufactured from a resin compound formed when 5 parts or more by weight of the pulverized inorganic fire retarder and 5wt.% or more pulverized boric acid are blended in 100 parts by weight of resin for a total of 100wt.% or less.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire-resistant panel having a metal plate as a face material and having a foam filled inside thereof, which is excellent in appearance, strength, lightness and fire resistance.

[0002]

2. Description of the Related Art Conventional fireproof panels include lightweight concrete foam panels, panels sandwiching a synthetic synthetic resin core between metal plates, and synthetic foam blending lightweight aggregates such as perlite. There is a panel in which a resin core material is sandwiched between metal plates. For example, Japanese Patent Application Laid-Open No. 53-27223 introduces a panel in which a polyisocyanurate foam is sandwiched by a metal plate having Na ₂ O, B ₂ O ₃ or the like on its inner surface. JP 5
5-90351, Japanese Patent Laid-Open No. 55-90352, and the like, introduce a sandwich panel having a synthetic resin foam layer in which a net-shaped refractory, an inorganic refractory layer, an incombustible plate material and the like are laminated as a core material. In addition, Japanese Patent Laid-Open No. 6-138851
In the gazette, a sandwich panel in which phosphate cement foam is injected between face materials is introduced.

[0003]

Although the foam concrete panel has excellent fire resistance, it is heavy and requires large equipment for construction. Further, since the concrete is exposed on the surface, it is necessary to finish the painting after the construction, so that the construction period becomes long. A metal panel sandwiching a foam synthetic resin core material is lightweight, but cracks easily occur in the core material when heated, resulting in poor heat resistance and fire resistance. Further, the core material containing the foamed lightweight aggregate has a problem that the adhesive strength to the face material is locally reduced and the bending strength of the panel is reduced. The present invention has been devised to solve such problems, a powdered inorganic flame retardant having water of crystallization and a resin containing boric acid as a fire-resistant core material, and a glass net is inserted to make the fire resistant. An object of the present invention is to provide a fireproof panel excellent in appearance, strength, lightness and fire resistance by preventing the core material from cracking.

[0004]

The fireproof panel of the present invention comprises:
In order to achieve the object, a foamed resin obtained by mixing 5 parts by weight or more of a powdery inorganic flame retardant having water of crystallization and 5 parts by weight or more of powdered boric acid with 100 parts by weight of a resin in a total compounding amount of 100 parts by weight or less. A core material, a glass net having a mesh pitch of 3 mm × 3 mm to 30 mm × 30 mm inserted inside the core material, and a metal face plate bonded to both front and back surfaces of the core material. And

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In a fireproof panel according to the present invention, as shown in FIG. 1, a resin foam 3 is sandwiched between metal face plates 1 and 2 as a core material. As the metal face plates 1 and 2, metal plates having a plate thickness of 0.2 to 2 mm are used. Specifically, various surface-treated steel sheets, galvalume steel sheets, Cu-plated steel sheets,
Aluminum plated steel sheet etc. are available. A flat metal plate is generally used, but it is also possible to use a metal plate whose appearance and strength are improved by embossing or bending with a roll forming machine or the like. As the resin foam 3, foamed resin such as urethane foam, isocyanurate foam, and phenol foam is used. Among them, a phenol resin foam excellent in flame retardancy is preferable.

Phenolic foams are classified into resole resin type and novolac resin type, and the resole resin type is preferable for the foam used in the present invention. Foaming resins include phenol sulfonic acid, paratoluene sulfonic acid,
Hardeners for organic sulfonic acids such as xylene sulfonic acid, benzene sulfonic acid, petroleum ether, naphtha, pentane,
Volatile petroleum such as hexane, blowing agents such as methylene chloride, carbon tetrachloride, trichloroethane, fluorotrichloromethane, trifluorotrichloroethane and other low boiling point hydrocarbons, polyoxyethylene nonylphenyl ether, polyoxyethylene lauryl ethers, A foam stabilizer such as a nonionic activator such as polyoxyethylene solibitan stearate, polyoxyethylene castor oil fatty acid ester, and polyoxyethylene dimethyl silicone is appropriately added. Resole resin foam is made by reacting phenol and formalin in the presence of an alkaline catalyst to a resole resin, adding a foaming agent, foam stabilizer, etc. to prepare a resole resin compound. It is manufactured by Phenol sulfonic acid, paratoluene sulfonic acid, xylene sulfonic acid, etc. are used as the strong acid to obtain an insoluble and infusible cured resin foam.

When the resin foam 3 is manufactured, a powdery inorganic flame retardant having water of crystallization and boric acid are added to the resin compound. Aluminum hydroxide, magnesium hydroxide, gypsum dihydrate, borax, zeolite, aluminum phosphate, etc. are used as the inorganic flame retardant. By adding the flame retardant, the endothermic action due to the thermal decomposition of the flame retardant that occurs near the thermal decomposition temperature of the resin and the diluting action due to the large amount of non-combustible gas such as steam generated during decomposition are exhibited, and the combustion of the resin is suppressed. . Boric acid is also one of the inorganic flame retardants that has water of crystallization. In addition to suppressing the combustion of the resin by the similar endothermic action and diluting action, it melts at around 500 ° C. and the endothermic reaction at the time of melting causes the foamed resin itself to disappear. Suppresses thermal decomposition. Also,
The molten boric acid covers the surface of the foamed resin and blocks the oxygen supply from the outside, thereby exhibiting the action of improving the fire resistance of the foamed resin. That is, among the investigated inorganic flame-retardant materials, only boric acid melts at around 500 ° C., the endothermic reaction at the time of melting suppresses thermal decomposition of the resin itself, and the melted boric acid covers the surface of the foamed resin, and oxygen from the outside It was found from the results of the study that it acts to cut off the supply.

The powdery inorganic flame retardant containing water of crystallization has a content of 5 parts with respect to 100 parts by weight of the resin in order to obtain a predetermined fire resistance.
It is preferable to mix them in a proportion of not less than parts by weight. If the blending amount is less than 5% by weight, the fire resistance is poor. Boric acid is preferably blended in a ratio of 5 parts by weight or more with respect to 100 parts by weight of the resin in order to suppress combustion and thermal decomposition of the resin. If the blending amount is less than 5% by weight, the action of boric acid that suppresses the combustion and decomposition of the resin will not be sufficiently exhibited. However, if the total amount of the inorganic flame retardant and boric acid exceeds 100 parts by weight, the liquid viscosity of the resole resin compound becomes extremely high, which may adversely affect the foaming behavior and the resin may not foam.

A glass net 4 is inserted in the resin foam 3. The glass net 4 improves the bending strength of the refractory core material and suppresses the occurrence of cracks in the refractory core material which shrink while thermally decomposing during heating. The glass net used should preferably have a weave with a pitch of 5 mm × 5 mm to 30 mm × 30 mm. Pitch is 5m
If the size is less than m × 5 mm, the foam will be broken up and down with the glass net 4 inserted between the resin foams 3 at the time of handling (lifting, cutting, etc.) of the panel, and the strength of the panel will be reduced. On the other hand, if the pitch is 30 mm × 30 mm or more, the action of preventing cracking of the refractory core material 3 caused by heating is reduced.

[0010]

[Examples] A panel made of a color steel plate in which a resol resin mixture was mixed with a curing agent (a mixture of phenolsulfonic acid and paratoluenesulfonic acid), aluminum hydroxide and boric acid in a mixing ratio shown in Table 1 and then a glass net was inserted. It was placed in the bottom plate and the top plate was covered. The glass net is
It was adjusted so that it would not come into contact with the front and back face plates. And 60
The filled resin was foamed by heating at 5 ° C. for 5 minutes to produce a fireproof panel having a thickness of 35 mm. Further, in Comparative Examples 3 to 6, a glass net was inserted into the resin after foaming, and the glass net was adjusted so as not to contact the front and back face plates.

[0011]

With respect to each of the obtained panels, the adhesive strength between the fireproof core material and the color steel plate and the density of the fireproof core material were measured.
As can be seen from the measurement results in Table 2, in the fire resistant panel according to the present invention, the fire resistant core material was bonded to the color steel sheet with sufficient bonding strength. This is because the filled aluminum hydroxide and boric acid are fine powders. It is considered that this is because the cohesive force of the foam was not adversely affected and the powder itself was not broken. On the other hand, in Comparative Example 8, the adhesive strength to the color steel sheet is reduced. It is considered that this is because the lightweight foam aggregate filled in the foam had insufficient adhesion to the foam and the lightweight foam aggregate itself was destroyed, and thus exhibited low adhesive strength. In the fire-resistant panel of Comparative Example 5 in which a glass net having a small mesh pitch of 3 mm × 3 mm was inserted, cracks occurred in the vicinity of the net, and the adhesive test and the fire test could not be performed. Also,
In Comparative Example 7, the total blending amount of aluminum hydroxide and boric acid was too large, and foaming of the resin was not observed. Regarding the degree of adhesion, the fireproof panel according to the present invention is significantly smaller than the foam concrete panel.

[0013]

Further, each fireproof panel is fireproofed in accordance with JIS A1304 "Method of fireproofing of building structure",
The temperature reached to the back side of the fire-resistant panel was measured with the temperature of 260 ° C. at which the carbonization of the wood system begins as the evaluation temperature. As can be seen from the measurement results of FIG. 2, in the refractory panel of Comparative Example 1 in which aluminum hydroxide and boric acid were not mixed and the glass net was not inserted, the back surface temperature exceeded 260 ° C. in about 30 minutes.
In the fire-resistant panel of Comparative Example 2 in which the glass net was not inserted, the time required for the back surface temperature to reach 260 ° C. was extended to 60 minutes, but this was insufficient as the time required for initial activity in the event of a fire or the like. The backside temperature of the fire-resistant panel of Comparative Example 3 in which a glass net was inserted without compounding aluminum hydroxide and boric acid exceeded 260 ° C in about 45 minutes. The fire-resistant panel of Comparative Example 4 in which a small amount of aluminum hydroxide and boric acid were added and a glass net was inserted had the same structure as in Comparative Example 3.
The backside temperature exceeded 260 ° C. in about 5 minutes. In the fireproof panel of Comparative Example 6 in which a large glass net having a mesh pitch of 50 mm × 50 mm was inserted, the effect of preventing cracking of the fireproof core material generated during heating was small, and the backside temperature exceeded 260 ° C. in about 60 minutes. It was On the other hand, in the fire-resistant panels of Invention Examples 1 and 2 in which the foamed resin in which aluminum hydroxide and boric acid were blended in the blending amount specified in the present invention was used as the core material and the glass net was inserted, 60 minutes later, Also, the back side was kept at a temperature sufficiently lower than 260 ° C. Further, observation of the fire-resistant core material after the test also confirmed that cracking of the fire-resistant core material due to combustion was suppressed by the glass net.

[0015]

As described above, the fire-resistant panel of the present invention has a core made of a powdered inorganic flame retardant and boric acid at a specified blending ratio, in which a glass net is inserted in a foamable resin, and a metal is used. It has a structure sandwiched between face plates. Due to this structure, it is excellent in lightweight and fire resistance, and since the adhesion of the core material to the face plate is high, it is used as a building material for various buildings, structures and the like that require fire resistance.

[Brief description of drawings]

1 is a cross-sectional structure of a fireproof panel according to the present invention.

[Fig. 2] Back-side temperature rise condition when each fireproof panel is fireproof tested

[Explanation of symbols]

1,2: metal face plate 3: resin foam (core material)
4: Glass net

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display area E04C 2/26 E04C 2/26 V

Claims (1)

[Claims] 1. A core material made of a foamed resin in which 5 parts by weight or more of a powdery inorganic flame retardant having water of crystallization and 5 parts by weight or more of boric acid powder are mixed with 100 parts by weight of a resin in a total compounding amount of 100 parts by weight or less. And a glass net having a mesh pitch of 3 mm × 3 mm to 30 mm × 30 mm inserted inside the core material and metal face plates bonded to both front and back surfaces of the core material. Fireproof panel.