JPH11117422A - Steel frame covering fire-resistant layered product and fire-resistant covered steel structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the execution property and fire resistance of a steel frame covering fire-resistant layered product by laminating a fire-resistant expansion sheet made of a thermoplastic resin and/or a resin composition containing a rubber material, a phosphorus compound, and an inorganic filler and a layer made of a foam body or a buffer on the side of a plate made of a nonflammable material facing a steel frame. SOLUTION: A fire-resistant expansion sheet 12 and a foam body layer 13 are arranged in sequence on the side of a stainless steel plate 11 facing an H-steel 15 and arranged on the outermost layer, and a fixing tool 16 is driven into the overlapped portion of the stainless steel plate 11 at a joint to fix a steel frame covering fire- resistant layered product 10 to a steel frame. A thermoplastic resin and/or a rubber material having high nonflammability by itself, e.g., a chloroprene resin or a chlorinated butyl resin, is used for a resin composition constituting the fire-resistant expansion sheet 12. Red phosphorus improving a nonflammable effect with the addition of a small quantity is used for a phosphorus compound, and a hydrous inorganic reducing a temperature rise and obtaining high heat resistance is used for an inorganic filler. The steel frame covering fire-resistant layered product 10 is easily fitted to the steel frame, and it exerts excellent fire resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a column, a beam,
A fire-resistant laminate for steel frame coating used for steel frames such as walls, which can be easily installed, and has a fire-resistant performance with excellent fire resistance, and a fire-resistant laminate for steel frame coating. The present invention relates to a fire-resistant coated steel structure.

[0002]

2. Description of the Related Art Along with an increase in the height of buildings, lightweight steel frames have been used as beams, columns, etc., which are structural materials of the buildings. Steel frames used as structural materials for buildings include Notification No. 2999 of the Ministry of Construction and JIS A 1304.
In order to satisfy the standards, it is common practice to coat the surface of a steel frame with a material having excellent fire resistance.

[0003] As a coating material for imparting fire resistance to steel frames, Japanese Patent Application Laid-Open No. Hei 6-32664 discloses a material in which inorganic components such as vermiculite and rock wool are mixed with water glass or hydraulic cement. . However, this method had to be applied or sprayed on the steel frame at the time of construction, and the workability was poor. Further, the thickness of the formed refractory coating layer tends to be uneven, and when the thickness is uneven, sufficient fire resistance cannot be exhibited. In addition, cracks may occur in the formed fire-resistant coating layer, and the fire resistance may decrease. Furthermore, when spraying by a wet or semi-dry method, it takes a long time to cure and the working efficiency is poor.

[0004] Refractory paints are commercially available from Mitsui Kinzoku Paint Co., Ltd., and such refractory paints are used at construction sites.
Since it is necessary to mix different types of paints, coating unevenness is likely to occur, and it has been difficult to impart uniform fire resistance to steel frames. There is also a method of installing a calcium silicate plate around the steel frame.However, since it is necessary to use a thick calcium silicate plate and fix it with a large amount of nails, screws, etc., the workability is very poor. In addition, there is a disadvantage that a large amount of dust is generated when cutting a calcium silicate plate.

Japanese Utility Model Application Laid-Open Publication No. Sho 62-163206 discloses that a base material such as rock wool felt, a ceramic fiber felt, and a net are weighted, sewn together with a wire, integrated, and one end is pressed. Disclosed is a refractory coating having ears formed at the ends. However, in order to cover a steel frame with this fire-resistant coating material, after applying the fire-resistant coating material to the steel frame, it is necessary to alternately overlap the ear parts and fold and fold the metal mesh, In order to fix the refractory coating material to the steel frame, it is necessary to erect a welding pin or the like using a welding gun and lock it at a number of places, which also has a problem in workability.

Japanese Patent Application Laid-Open No. 2-108748 discloses a structure in which a refractory coating is attached around a steel structure to form a refractory coating around the steel frame.
This structure was formed by lining a metal plate with a foamed heat insulating material, a foamed material coated with a fire-resistant paint, and the like, and had good workability. However, the structure is composed of only a metal plate and a heat insulating material, has a limited fire resistance, and requires a thick coating of 40 mm or more.

[0007] JP-A-7-133640 discloses a coating material in which a water-absorbing gel is packed with aluminum-evaporated polyethylene and further wrapped with a ceramic mat. However, this method has a drawback that the gel portion is cut off at the time of construction, or when the nail is hit, the internal water-absorbing gel leaks out and becomes unusable.

[0008]

DISCLOSURE OF THE INVENTION In view of the above, the present invention provides a fire-resistant laminate for steel frame coating having excellent workability and fire resistance.
It is another object of the present invention to provide a fire-resistant coated steel structure covered with the fire-resistant laminate for steel frame coating.

[0009]

According to the first aspect of the present invention, there is provided a refractory laminate for covering a steel frame, comprising a sheet material (A) made of a non-combustible material covering the periphery of the steel frame and a refractory expansion sheet (B) provided on a side facing the steel frame.
And a layer (C) made of a foam or a cushioning material, wherein the fire-resistant expansion sheet (B) comprises a thermoplastic resin and / or a rubber substance, a phosphorus compound and an inorganic filler. It comprises a resin composition containing an agent. In addition, the fire-resistant laminate for covering a steel frame according to the second aspect of the present invention includes a fire-resistant expansion sheet (B) and corrugations, ridges or irregularities on the side of the plate (A) made of a noncombustible material that covers the periphery of the steel frame facing the steel frame. A fire-resistant laminate for covering a steel frame formed by laminating a layer (D) made of a shape-imparted wire mesh, wherein the fire-resistant expansion sheet (B) comprises a thermoplastic resin and / or a rubber substance, a phosphorus compound and an inorganic filler. It comprises a resin composition containing an agent. Hereinafter, the present invention will be described in detail.

The fire-resistant laminate for covering steel frames of the present invention 1 comprises a fire-resistant expansion sheet (B) and a layer (C) made of a foam or cushioning material on the side of the plate (A) made of a noncombustible material facing the steel frame.
Are laminated. The order of laminating the fire-resistant expansion sheet (B) and the layer (C) made of the foam or the cushioning material is not particularly limited, and the side of the plate (A) made of a noncombustible material facing the steel frame may be (B) ), (C), or
The layers may be stacked in the order of (C) and (B).

The plate material (A) made of the above non-combustible material is not particularly limited. For example, a metal plate such as an iron plate, a stainless plate, a stainless steel foil, an aluminum plate, an aluminum foil, a galvanized steel plate, and an aluminum / zinc alloy-plated steel plate , Calcium silicate board, fiber-mixed calcium silicate board, calcium carbonate board, gypsum board, reinforced gypsum board, perlite cement board, fiber reinforced cement board, wood chip cement board, wood flour cement board, inorganic board such as slag gypsum board, rock wool Insulation plates, ceramic wool blankets, alumina silica fiber felt, ceramic paper, aluminum hydroxide paper, and the like can be used. The plate material (A) made of the non-combustible material may be one in which a plurality of plate materials made of the above material are bonded.

The foam material constituting the layer (C) made of the foam or the cushioning material is not particularly limited.
Examples include a polyurethane resin foam sheet, a polystyrene resin foam sheet, a polyethylene resin foam sheet, a polypropylene resin foam sheet, a phenol resin foam sheet, and the like.

The foam may contain an inorganic filler such as glass fiber, calcium carbonate, calcium hydroxide, aluminum hydroxide and magnesium hydroxide. The material of the buffer material is not particularly limited, for example, glass wool, ceramic wool, rock wool,
Examples include resin fiber nonwoven fabrics such as polyethylene terephthalate, polyester, nylon, and polypropylene.

The fire-resistant expansion sheet (B) comprises a resin composition containing a thermoplastic resin and / or a rubber substance, a phosphorus compound and an inorganic filler.

The thermoplastic resin and / or rubber substance is not particularly limited. For example, a polypropylene resin,
Polyolefin resin such as polyethylene resin, poly (1-) butene resin, polypentene resin, polystyrene resin, acrylonitrile-butadiene-styrene resin, polycarbonate resin, polyphenylene ether resin, acrylic resin, polyamide resin , A polyvinyl chloride resin, a phenol resin, a polyurethane resin, polybutene, polychloroprene, polybutadiene, polyisobutylene, and nitrile rubber.

Halogenated resins such as chloroprene-based resins and chlorinated butyl-based resins have high flame retardancy by themselves,
Crosslinking is caused by the dehalogenation reaction by heat, which is preferable in that the strength of the residue after heating is improved. Those exemplified as the above-mentioned thermoplastic resin and / or rubber substance are:
Since it is very flexible and has rubber-like properties, it is possible to highly fill the above-mentioned inorganic filler, and the obtained resin composition becomes flexible and flexible. In order to obtain a more flexible and flexible resin composition, a non-vulcanized rubber or a polyethylene resin is preferably used.

The thermoplastic resin and / or rubber substance may be
They may be used alone or in combination of two or more. A blend of two or more resins may be used as the base resin in order to adjust the melt viscosity, flexibility, adhesiveness, and the like of the resin.

The thermoplastic resin and / or the rubber material may be further crosslinked or modified as long as the fireproof performance of the fireproof expanded sheet (B) of the present invention 1 is not impaired. The timing at which the thermoplastic resin and / or the rubber substance is crosslinked or modified is not particularly limited, and a previously crosslinked, modified thermoplastic resin and / or rubber substance may be used.
Crosslinking or modification may be performed at the same time when other components such as a phosphorus compound or an inorganic filler described later are blended, or crosslinking or modification may be performed after blending other components with a thermoplastic resin and / or a rubber substance. May be performed at any stage. The method for cross-linking the thermoplastic resin and / or rubber substance is not particularly limited, and a cross-linking method generally performed for the thermoplastic resin or rubber substance, for example, cross-linking using various cross-linking agents, peroxides, etc., and electron beam irradiation And the like.

The phosphorus compound is not particularly limited.
For example, red phosphorus; various phosphates such as triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, xylendiphenyl phosphate; phosphorus such as sodium phosphate, potassium phosphate, and magnesium phosphate Acid metal salts; ammonium polyphosphates; and compounds represented by the following general formula (1). Among these, from the viewpoint of fire resistance, red phosphorus, ammonium polyphosphates, and compounds represented by the following general formula (1) are preferable, and ammonium polyphosphates are more preferable in terms of performance, safety, cost, and the like. preferable.

[0020]

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In the formula, R ¹ and R ³ are hydrogen, carbon number 1 to
It represents a 16 linear or branched alkyl group or an aryl group having 6 to 16 carbon atoms. R ² is a hydroxyl group, a linear or branched alkyl group having 1 to 16 carbon atoms, a linear or branched alkoxyl group having 1 to 16 carbon atoms,
Represents an aryl group having 6 to 16 carbon atoms or an aryloxy group having 6 to 16 carbon atoms.

The above-mentioned red phosphorus improves the flame-retardant effect when added in a small amount. As the red phosphorus, commercially available red phosphorus can be used, but from the viewpoint of moisture resistance, safety such as not spontaneously igniting during kneading, those obtained by coating the surface of red phosphorus particles with a resin are preferably used. .

The above ammonium polyphosphates are not particularly limited, and include, for example, ammonium polyphosphate and melamine-modified ammonium polyphosphate. Of these, ammonium polyphosphate is preferably used from the viewpoint of handleability and the like. As a commercially available product, for example, "AP4" manufactured by Hoechst
22, "AP462", "Sumisafe P" manufactured by Sumitomo Chemical Co., Ltd., "Terage C60" manufactured by Chisso Corporation, and the like.

The compound represented by the above general formula (1) is not particularly restricted but includes, for example, methylphosphonic acid, dimethyl methylphosphonate, diethyl methylphosphonate, ethylphosphonic acid, propylphosphonic acid, butylphosphonic acid, 2-methylpropyl Phosphonic acid, t-butylphosphonic acid, 2,3-dimethyl-butylphosphonic acid, octylphosphonic acid, phenylphosphonic acid, dioctylphenylphosphonate, dimethylphosphinic acid, methylethylphosphinic acid, methylpropylphosphinic acid, diethylphosphinic acid, dioctyl Examples include phosphinic acid, phenylphosphinic acid, diethylphenylphosphinic acid, diphenylphosphinic acid, and bis (4-methoxyphenyl) phosphinic acid. Among them, t-butyl phosphonic acid is expensive, but is preferable in terms of high flame retardancy. The above phosphorus compounds may be used alone or in combination of two or more.

The inorganic filler is not particularly limited.
For example, metal oxides such as alumina, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide, tin oxide, antimony oxide, and ferrites; calcium hydroxide, magnesium hydroxide, aluminum hydroxide, hydrotalcite, and the like. Hydrous inorganic substances; basic magnesium carbonate, calcium carbonate, magnesium carbonate, zinc carbonate, strontium carbonate, barium carbonate and other metal carbonates; calcium salts such as calcium sulfate, gypsum fiber and calcium silicate; silica, diatomaceous earth, dawsonite, barium sulfate ,
Talc, clay, mica, montmorillonite, bentonite, activated clay, sepiolite, imogolite, sericite, glass fiber, glass beads, silica-based balun, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon fiber, carbon balun , Charcoal powder, various metal powders, potassium titanate, magnesium sulfate "MOS" (trade name), lead zirconate titanate, aluminum borate, molybdenum sulfide, silicon carbide, stainless steel fiber, zinc borate, various magnetic powders, slag Fiber, fly ash, dewatered sludge and the like can be mentioned. Among them, hydrous inorganic substances and metal carbonates are preferred.

Water-containing inorganic substances such as magnesium hydroxide and aluminum hydroxide are endothermic due to water generated by a dehydration reaction during heating, and the temperature rise is reduced to obtain high heat resistance. It is particularly preferable in that the oxide remains as an aggregate, which acts as an aggregate to improve the strength of the residue. Magnesium hydroxide and aluminum hydroxide have different temperature ranges where the dehydration effect is exhibited,
When used together, the temperature range in which the dehydration effect is exhibited is widened, and a more effective temperature rise suppression effect is obtained. Metal carbonates such as calcium carbonate and zinc carbonate are considered to promote expansion by the reaction with the phosphorus compound. Particularly, when ammonium polyphosphate is used as the phosphorus compound, a high expansion effect is obtained. Also,
It acts as an effective aggregate and forms a residue with high shape retention after burning. Among the above-mentioned metal carbonates, further, alkali metal carbonates such as sodium carbonate; alkaline earth metal carbonates such as magnesium carbonate, calcium carbonate and strontium carbonate; carbonates of Group IIb metals such as zinc carbonate Salts are preferred. Generally, it is considered that an inorganic filler contributes to an improvement in residue strength and an increase in heat capacity because it functions as an aggregate. The inorganic fillers may be used alone or in combination of two or more.

The particle size of the inorganic filler is 0.5 to
100 μm can be used, and more preferably, about 1 to
50 μm. Further, it is more preferable to use a combination of an inorganic filler having a large particle size and a small filler having a small particle size. By using the combination, it is possible to achieve high packing while maintaining the mechanical performance of the sheet. .

The fire-resistant expansion sheet (B) contains, in addition to a thermoplastic resin and / or a rubber substance, a phosphorus compound and an inorganic filler, neutralized heat-expandable graphite, polyhydric alcohol and the like. You may. The neutralized heat-expandable graphite is obtained by neutralizing a conventionally known heat-expandable graphite. The above-mentioned heat-expandable graphite is a powder of natural scale-like graphite, pyrolytic graphite, quiche graphite or the like, concentrated sulfuric acid, nitric acid, inorganic acid such as selenic acid and concentrated nitric acid, perchloric acid, perchlorate, permanganate. , A graphite intercalation compound formed by treatment with a strong oxidizing agent such as dichromate, hydrogen peroxide or the like, and a crystalline compound while maintaining a layered structure of carbon.

The heat-expandable graphite obtained by the acid treatment as described above is further neutralized with ammonia, a lower aliphatic amine, an alkali metal compound, an alkaline earth metal compound, etc. Heat-expandable graphite. The aliphatic lower amine is not particularly limited and includes, for example, monomethylamine, dimethylamine, trimethylamine,
Ethylamine, propylamine, butylamine and the like can be mentioned. The alkali metal compound and alkaline earth metal compound are not particularly limited, and include, for example, hydroxides, oxides, carbonates, sulfates, and organic acid salts of potassium, sodium, calcium, barium, magnesium, and the like. . Commercial products of the neutralized heat-expandable graphite include, for example, "CA-60S" manufactured by Nippon Kasei Co., Ltd.

The particle size of the neutralized heat-expandable graphite is preferably 20 to 200 mesh. When the particle size is smaller than 200 mesh, the degree of expansion of graphite is small, a predetermined refractory insulation layer cannot be obtained, and when the particle size is larger than 20 mesh, there is an advantage that the degree of expansion of graphite is large,
When kneaded with a thermoplastic resin and / or a rubber substance, dispersibility deteriorates, and deterioration of physical properties cannot be avoided.

The polyhydric alcohol is a hydrocarbon compound having two or more hydroxyl groups in the molecule, and preferably has 1 to 50 carbon atoms. Examples of the polyhydric alcohol include ethylene glycol, diethylene glycol, propylene glycol, butylene glycol, 1,4-butanediol, 1,6-hexanediol, monopentaerythritol, dipentaerythritol, tripentaerythritol, neopentaerythritol, Sorbitol, inositol, mannitol, glucose, fructose, starch, cellulose and the like. The polyhydric alcohols may be used alone or in combination of two or more.

As the polyhydric alcohol, the ratio of the number of hydroxyl groups to the number of carbon atoms in the molecule [(number of hydroxyl groups) / (number of carbon atoms)]
Is preferably from 0.2 to 2.0, and more preferably [(number of hydroxyl groups) / (number of carbon atoms)] as represented by pentaerythritols, sorbitol, mannitol and the like is 0.7. ~ 1.5. Among them, pentaerythritols are most preferable because of their high hydroxyl group content and high carbonization promoting effect.

Polyhydric alcohols having a ratio of the number of hydroxyl groups to the number of carbon atoms [(number of hydroxyl groups) / (number of carbon atoms)] in the range of 0.2 to 2.0 are dehydrated and condensed at the time of combustion. A carbonized layer is formed. When the above ratio [(number of hydroxyl groups) / (number of carbon atoms)] is less than 0.2, decomposition of carbon chains is more likely to occur during combustion than dehydration condensation, so that a sufficient carbonized layer cannot be formed, If it exceeds 2.0, the formation of a carbonized layer is not hindered, but the water resistance is significantly reduced. When the water resistance decreases, the polyhydric alcohol is eluted when the resin composition immediately after molding is cooled with water, or there is a problem that the polyhydric alcohol bleeds out due to humidity during storage of the molded article. .

Hereinafter, preferred examples of the resin composition constituting the fire-resistant expansion sheet (B) of the present invention 1 will be described with specific examples. Resin compositions 1 to 5 described below
The above-mentioned materials are used as each material such as a thermoplastic resin and / or a rubber substance constituting the above. First, the resin composition 1 of the present invention comprises a thermoplastic resin and / or a rubber substance, a phosphorus compound, a neutralized heat-expandable graphite, and an inorganic filler. The amount of the heat-expandable graphite thus obtained is 20 in total with respect to 100 parts by weight of the thermoplastic resin and / or rubber substance.
-200 parts by weight, the weight ratio of the neutralized heat-expandable graphite to the phosphorus compound [(neutralized heat-expandable graphite)
/ (Phosphorus compound)] is 0.01 to 9, and the blending amount of the inorganic filler is 10% or less.
50 to 500 parts by weight, based on 0 part by weight, of a resin composition having a weight ratio of the inorganic filler to the phosphorus compound [(inorganic filler) / (phosphorus compound)] of 0.6 to 1.5. No.

Among the above-mentioned inorganic fillers, preferred are the above-mentioned hydrated inorganic substances, the above-mentioned alkali metals, alkaline earth metals and metal carbonates of Group IIb metals of the periodic table, and mixtures of the above-mentioned hydrated inorganic substances and the above-mentioned metal carbonates.

The compounding amount of the phosphorus compound and the neutralized heat-expandable graphite is preferably 20 to 200 parts by weight in total with respect to 100 parts by weight of the thermoplastic resin and / or rubber substance. If the amount is less than 20 parts by weight, sufficient fire resistance cannot be obtained, and if it exceeds 200 parts by weight, mechanical properties are greatly reduced and the product cannot be used.

The amount of the inorganic filler is from 50 to 100 parts by weight of the thermoplastic resin and / or rubber substance.
500 parts by weight are preferred. If it is less than 50 parts by weight, sufficient fire resistance cannot be obtained, and if it exceeds 500 parts by weight, the mechanical properties are greatly reduced, and it cannot be used. More preferably, it is 60 to 300 parts by weight. The weight ratio [(inorganic filler) / (phosphorus compound)] between the inorganic filler and the phosphorus compound is preferably from 0.6 to 1.5.

The weight ratio of the neutralized heat-expandable graphite to the phosphorus compound [(neutralized heat-expandable graphite)
/ (Phosphorus compound)] is preferably from 0.01 to 9. The weight ratio of the neutralized heat-expandable graphite to the phosphorus compound is
By setting it to 0.01 to 9, it is possible to obtain shape retention of combustion residues and high fire resistance. If the compounding ratio of the neutralized heat-expandable graphite is too large, the expanded graphite will be scattered during combustion, and a sufficient expanded heat-insulating layer cannot be obtained. On the other hand, if the compounding ratio of the phosphorus compound is too large, the formation of the heat insulating layer is not sufficient, so that a sufficient heat insulating effect cannot be obtained.

The weight ratio of the neutralized heat-expandable graphite to the phosphorus compound [(neutralized heat-expandable graphite) /
(Phosphorus compound)] within the above range of 0.01 to 9, if the blending ratio of the neutralized heat-expandable graphite is large, a high expansion ratio can be obtained, but the shape retention is not sufficient. In this case, from the viewpoint of shape retention during combustion, the weight ratio of the neutralized thermally expandable graphite to the phosphorus compound is:
0.01 to 2 is preferred. More preferably, 0.02-
0.3, and more preferably 0.025 to 0.2. When the blending amount of the neutralized heat-expandable graphite is 10
When the amount is less than parts by weight, the shape retention is relatively good, and the heated residue does not collapse.

Although the mechanism of the fire resistance of the resin composition 1 is not necessarily clear, it is considered that it develops as follows. That is, the heat-expandable graphite that has been neutralized expands by heating to form a heat-insulating layer, thereby preventing heat transfer. The inorganic fillers then contribute to an increase in heat capacity. The phosphorus compound has a shape-retaining ability of the expanded heat-insulating layer.

Next, as the resin composition 2 in the present invention 1, a thermoplastic resin and / or a rubber substance, a phosphorus compound, and a metal carbonate of the above-mentioned alkali metal, alkaline earth metal and Group IIb metal of the periodic table are used. The total amount of the phosphorus compound and the metal carbonate is 50 to 900 parts by weight based on 100 parts by weight of the thermoplastic resin and / or the rubber substance, and the weight ratio of the metal carbonate and the phosphorus compound [(metal carbonate salt)
/ (Phosphorus compound)] is 0.6 to 1.5.

The total amount of the phosphorus compound and the metal carbonate is preferably 50 to 900 parts by weight based on 100 parts by weight of the thermoplastic resin and / or rubber substance. The weight ratio of the metal carbonate to the phosphorus compound [(metal carbonate) / (phosphorus compound)] is preferably 0.6 to 1.5. The weight ratio between the metal carbonate and the phosphorus compound is set to 0.1.
By setting it to 6 to 1.5, foaming and expansion can be achieved and a strong film can be formed. If the amount of the metal carbonate is too large, a sufficient expansion ratio cannot be obtained, and if the amount of the phosphorus compound is too large, the breaking strength decreases and the mechanical properties of the resin composition 2 decrease.

Although the mechanism of the fire resistance of the resin composition 2 is not necessarily clear, it is considered that it develops as follows. That is, the decarboxylation and deammonification reactions are accelerated by the chemical reaction between polyphosphoric acid and carbonate generated from the phosphorus compound during heating. The phosphorus compound generates polyphosphoric acid and also functions as a binder for the foam film. Metal carbonates play an aggregate role. The hydrated inorganic substance and / or calcium salt is considered to play an aggregate role similarly to the metal carbonate.

Next, as the resin composition 3 in the present invention 1, a thermoplastic resin and / or a rubber substance, a phosphorus compound, the above-mentioned alkali metal, alkaline earth metal and Periodic Table IIb
A metal carbonate and / or a hydrated inorganic substance and / or a calcium salt of a group metal, wherein the total amount of the phosphorus compound, the metal carbonate and the hydrated inorganic substance and / or the calcium salt is 100 parts by weight of a thermoplastic resin and / or a rubber substance. 50 to
900 parts by weight, weight ratio of the metal carbonate and the total amount of the hydrated inorganic substance and / or calcium salt to the phosphorus compound [(total amount of the metal carbonate and the hydrated inorganic substance and / or calcium salt) / (phosphorus compound) Is 0.6
And 1.5 to 70 parts by weight of the resin composition in which the total amount of the hydrated inorganic substance and / or calcium salt is 100 parts by weight of the metal carbonate. The calcium salt is not particularly limited, and includes, for example, calcium sulfate, gypsum, calcium diphosphate and the like.

The total amount of the phosphorus compound, metal carbonate, hydrated inorganic substance and / or calcium salt is 50 parts by weight with respect to 100 parts by weight of the thermoplastic resin and / or rubber substance.
It is preferable to add ９００900 parts by weight. If the amount is less than 50 parts by weight, the amount of the residue after heating becomes insufficient, and a refractory and heat-insulating layer cannot be formed. If the amount exceeds 900 parts by weight, the mechanical properties of the resin composition 3 deteriorate. The total amount of the hydrated inorganic substance and / or calcium salt is preferably 1 to 70 parts by weight based on 100 parts by weight of the metal carbonate. If it exceeds 70 parts by weight, good shape retention cannot be exhibited.

The weight ratio of the metal carbonate and the total amount of the hydrated inorganic substance and / or the calcium salt to the phosphorus compound [(the total amount of the metal carbonate and the hydrated inorganic substance and / or the calcium salt) / (the phosphorus compound)] Is 0.6-
1.5 is preferred.

Although the mechanism of the fire resistance of the resin composition 3 is not necessarily clear, it is considered that it develops as follows. That is, the decarboxylation and deammonification reactions are accelerated by the chemical reaction between polyphosphoric acid and carbonate generated from the phosphorus compound during heating. The phosphorus compound generates polyphosphoric acid and also functions as a binder for the foam film. Metal carbonates play an aggregate role. The hydrated inorganic substance and / or calcium salt is considered to play an aggregate role similarly to the metal carbonate.

The resin composition 4 according to the present invention 1 includes a thermoplastic resin and / or a rubber substance, a phosphorus compound, a polyhydric alcohol, and the above-mentioned alkali metals, alkaline earth metals and metals of Group IIb metals of the periodic table. Made of carbonate,
The total amount of the phosphorus compound, the polyhydric alcohol, and the metal carbonate is 50 to 900 parts by weight based on 100 parts by weight of the thermoplastic resin and / or the rubber substance, and the weight ratio of the polyhydric alcohol to the phosphorus compound [( (Polyhydric alcohol) / (phosphorus compound)] is 0.05 to 20, and the weight ratio of the metal carbonate to the phosphorus compound [(metal carbonate) / (phosphorus compound)] is 0.01 to 50. And a resin composition.

The amount of the phosphorus compound, the polyhydric alcohol and the metal carbonate is 50 parts by weight of the thermoplastic resin and / or the rubber substance.
It is preferable to mix so as to be 900 parts by weight.
If the total amount of the above three components is less than 50 parts by weight, the amount of residue after heating becomes insufficient, and a fire-resistant heat-insulating layer cannot be formed. Physical properties decrease. More preferably, it is 100 to 700 parts by weight, and still more preferably 200 to 500 parts by weight.

The weight ratio of the polyhydric alcohol to the phosphorus compound [(polyhydric alcohol) / (phosphorus compound)] is from 0.05 to 20 from the viewpoint of exhibiting higher fire resistance and residue shape retention. Is preferred. The above weight ratio is 0.05
If it is less than 30, the foamed heat insulating layer becomes brittle and cannot withstand use. If it exceeds 20, foam expansion does not occur, and sufficient fire resistance cannot be obtained. More preferably, it is 0.3 to 10, and still more preferably 0.4 to 5.

The weight ratio of the metal carbonate to the phosphorus compound [(metal carbonate) / (phosphorus compound)] is from 0.01 to 5 from the viewpoint of improving the fire resistance and the shape retention of the residue.
0 is preferable, more preferably 0.3 to 15, and still more preferably 0.5 to 7. The above weight ratio is 0.01
If it is less than 3, the foam insulation layer becomes brittle. Since the phosphorus compound serves as a binder for the metal carbonate, if the weight ratio exceeds 50, the phosphorus compound does not function as a binder, which not only makes molding difficult, but also causes insufficient expansion and expansion during heating. Therefore, sufficient fire resistance cannot be obtained.

In the above resin composition 4, by combining a phosphorus compound, a polyhydric alcohol, and a metal carbonate, the resin composition 4 has sufficient heat resistance, makes the residue after combustion strong, and maintains the shape. It is intended. If the compounding ratio of the phosphorus compound to the polyhydric alcohol and the metal carbonate is too large, the material expands significantly during combustion, so that the heat insulation layer becomes brittle and the combustion residue is sufficiently strong so that it does not collapse even after burning the material vertically. Can not be obtained. If the amount of the metal carbonate is too large or the particle size is small, the oil absorption increases and the matrix viscosity at the time of foaming increases, so that foaming is suppressed and the heat insulating effect is not sufficient. If the amount of the metal carbonate is small, the viscosity is too low and the metal carbonate flows without foaming.

Although the mechanism of the fire resistance of the resin composition 4 is not necessarily clear, it is considered that the mechanism manifests as follows. That is, the phosphorus compound is dehydrated and foamed by heating, and also acts as a carbonization catalyst. The polyhydric alcohol forms a carbonized layer by the catalytic action of the phosphorus compound, and forms a heat insulating layer having excellent shape retention. The metal carbonate acts as an aggregate and makes the carbonized layer more robust.

Further, as the resin composition 5 in the present invention 1, a thermoplastic resin and / or a rubber substance, a phosphorus compound, a neutralized heat-expandable graphite, a polyhydric alcohol, and the above-mentioned alkali metal and alkaline earth Metals and Periodic Table IIb
The total amount of the phosphorus compound, the neutralized thermally expandable graphite, the polyhydric alcohol and the metal carbonate is 100 parts by weight of the thermoplastic resin and / or the rubber substance. 50 to 900 parts by weight, and the weight ratio of the polyhydric alcohol to the phosphorus compound [(polyhydric alcohol) / (phosphorus compound)] is 0.05 to 20,
The weight ratio of the neutralized heat-expandable graphite to the phosphorus compound ((neutralized heat-expandable graphite) / (phosphorus compound)) is 0.01 to 9, and the metal carbonate and the phosphorus compound are mixed. Weight ratio with phosphorus compound [(metal carbonate) / (phosphorus compound)]
But a resin composition of 0.01 to 50.

The mixing ratio of the phosphorus compound, the neutralized thermally expandable graphite, the polyhydric alcohol and the metal carbonate is based on 100 parts by weight of the thermoplastic resin and / or rubber substance. Total amount of 50 to 900
It is preferably in parts by weight. The total amount of the above four components is 5
If the amount is less than 0 parts by weight, the amount of the residue after heating becomes insufficient, so that a fire-resistant heat-insulating layer cannot be formed. If the amount exceeds 900 parts by weight, the mechanical properties of the resin composition 4 deteriorate. More preferably, it is 100 to 700 parts by weight, and still more preferably 200 to 500 parts by weight.

The weight ratio of the neutralized heat-expandable graphite to the phosphorus compound [(neutralized heat-expandable graphite)
/ (Phosphorus compound)] is preferably 0.01 to 9. By setting the weight ratio of the neutralized heat-expandable graphite to the phosphorus compound to 0.01 to 9, the shape retention of combustion residues and high fire resistance can be obtained. If the compounding ratio of the neutralized heat-expandable graphite is too large, the expanded graphite will be scattered during combustion, and a sufficient expanded heat-insulating layer cannot be obtained. On the other hand, if the compounding ratio of the phosphorus compound is too large, a sufficient heat insulating effect cannot be obtained because the heat insulating layer is not sufficiently formed.

From the viewpoint of shape retention during combustion, the weight ratio of the neutralized heat-expandable graphite to the phosphorus compound is more preferably 0.01 to 5. Even if the resin composition 4 itself is flame-retardant, if the shape-retaining property is insufficient, the brittle residue may collapse and may penetrate the flame. Can be selected depending on whether or not is necessary. More preferably, the above range is 0.01 to 2.

The weight ratio of the polyhydric alcohol to the phosphorus compound [(polyhydric alcohol) / (phosphorus compound)] is from 0.05 to 20 from the viewpoint of exhibiting higher fire resistance and residue shape retention. It is preferred that If the weight ratio is less than 0.05, the foamed fired layer becomes brittle and cannot be used, and if it exceeds 20, foam expansion does not occur,
Sufficient fire resistance cannot be obtained. More preferably, 0.3
-10, and more preferably 0.4-5.

The weight ratio of the metal carbonate to the phosphorus compound [(metal carbonate) / (phosphorus compound)] is from 0.01 to 5 from the viewpoint of improving the fire resistance and the shape retention of the residue.
0 is preferable, more preferably 0.3 to 15, and still more preferably 0.5 to 7. When the weight ratio is less than 0.01, the foamed fired layer becomes brittle. Since the phosphorus compound serves as a binder for the metal carbonate, if the weight ratio exceeds 50, the phosphorus compound does not function as a binder, which not only makes molding difficult, but also causes insufficient expansion and expansion during heating. Therefore, sufficient fire resistance cannot be obtained.

Although the mechanism of the fire resistance of the resin composition 5 is not necessarily clear, it is considered that it develops as follows. That is, the phosphorus compound is dehydrated and foamed by heating, and also acts as a carbonization catalyst. The polyhydric alcohol forms a carbonized layer by the catalytic action of the phosphorus compound, and forms a heat insulating layer having excellent shape retention. The metal carbonate acts as an aggregate and makes the carbonized layer more robust. The neutralized heat-expandable graphite expands at that time to form a heat-insulating layer, and acts more effectively to prevent heat transfer.

The fire resistant expansion sheet (B) made of the above resin composition has an initial bulk density at 25 ° C. of 0.8 to 2.0.
g / cm ³ are preferred. By setting the initial bulk density at 25 ° C. in the range of 0.8 to 2.0 g / cm ³ , physical properties such as heat insulation and fire resistance required for the fire resistant expansion sheet (B) are not impaired. Moreover, excellent workability can be obtained.

The initial bulk density at 25 ° C. is 0.8
When the amount is less than g / cm ³ , a sufficient amount of an expanding agent, a carbonizing agent, a non-combustible filler, and the like cannot be added to the resin composition, and the expansion ratio after heating and the amount of residues become insufficient. It is not possible to form a refractory insulation layer. If the initial bulk density at 25 ° C. exceeds 2.0 g / cm ³ , the weight of the resin composition becomes too large, so that the workability in attaching a large area resin composition and the like is reduced. More preferably, it is 1.0 to 1.8 g / cm ³ .

The fire resistant expansion sheet (B) has a bulk density of 0.05 to 0.5 g / h when heated at 500 ° C. for 1 hour.
cm ³ is preferred. If the bulk density at the time of heating at 500 ° C. for 1 hour is less than 0.05 g / cm ³ , there are too many gaps, and the fireproof heat insulating layer cannot be formed as a layer due to collapse during expansion. 5g /
If it exceeds cm ³ , the expansion ratio will be insufficient, fire performance cannot be sufficiently exhibited, and a fire-resistant heat-insulating layer cannot be formed. More preferably, 0.1 to 0.3
g / cm ³ .

The refractory expansion sheet (B) made of the above resin composition has a thermal conductivity of 0.01 to 0.3 kca after volume expansion for 30 minutes under heating conditions of 50 kW / cm ^2.
It is preferably 1 / m · h · ° C. 50 kW / cm
^If the thermal conductivity after volume expansion for 30 minutes under the heating condition of ² exceeds 0.3 kcal / m · h · ° C., sufficient heat resistance can be exhibited due to insufficient heat insulation performance. And less than 0.01 kcal / m · h · ° C. cannot be made with a mixture of an organic substance and an inorganic substance.

The fire resistant expansion sheet (B) made of the above resin composition was measured at a temperature of 10 ° C./Differential Scanning Calorimeter (DSC).
The total heat absorption when the temperature is raised to 600 ° C per minute is 100J
/ G or more. If it is at least 100 J / g, the temperature rise will be slow, and the heat insulation performance will be better.

In the present invention 1, the fire resistant expansion sheet (B) made of the above resin composition preferably has tackiness. The term "having adhesiveness" means having a property that enables temporary fixing to a plate material (A) or the like made of a noncombustible material, and refers to having a wide range of adhesiveness and / or adhesiveness. When the fire-resistant expansion sheet (B) has adhesiveness, it can be easily adhered to the plate material (A) made of a non-combustible material, and the workability at the time of producing a fire-resistant laminate for steel frame coating is improved. I do.

In order to impart tackiness to the fire resistant expansion sheet (B), for example, a tackifier may be added to the thermoplastic resin and / or rubber substance. The tackifier is not particularly limited, and includes, for example, tackifier resins, plasticizers, fats and oils, low-polymerized polymers, and the like. The tackifying resin is not particularly limited, and includes, for example, rosin, rosin derivative, dammar, copal, coumarone, indene resin, polyterpene, non-reactive phenol resin, alkyd resin, petroleum hydrocarbon resin, xylene resin, epoxy resin, etc. Is mentioned.

Although it is difficult for the plasticizer alone to impart tackiness to the fire-resistant expansion sheet (B), tackiness can be further improved by using the plasticizer in combination with the tackifier resin. The plasticizer is not particularly limited and includes, for example, phthalic acid plasticizer, phosphate ester plasticizer, adipate ester plasticizer, sabatate ester plasticizer, ricinoleate ester plasticizer, polyester plasticizer , An epoxy plasticizer, and paraffin chloride. The above fats and oils have the same action as the above plasticizer, and can be used for the purpose of imparting plasticity and as a tackifier. The fats and oils are not particularly limited, and include, for example, animal fats and oils, vegetable fats and oils, mineral oils, silicone oils and the like.

The above-mentioned low polymer of polymer can be used for the purpose of improving cold resistance and adjusting the flow, in addition to imparting tackiness. The polymer low-polymer is not particularly limited. For example, natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), 1,2-polybutadiene rubber (1,2-
BR), styrene-butadiene rubber (SBR), chloroprene rubber (CR), nitrile rubber (NBR), butyl rubber (IIR), ethylene-propylene rubber (EPM,
EPDM), chlorosulfonated polyethylene (CS
M), low polymers such as acrylic rubber (ACM, ANM), epichlorohydrin rubber (CO, ECO), polyvulcanized rubber (T), silicone rubber (Q), fluoro rubber (FKM, FZ), urethane rubber (U) And the like.

In the first aspect of the present invention, a flame retardant, an antioxidant, a metal damage inhibitor, an antistatic agent is added to the resin composition constituting the fire-resistant expansion sheet (B) as long as the physical properties of the resin composition are not impaired. Agents, stabilizers, crosslinking agents, lubricants, softeners,
Pigments, tackifying resins, and the like may be added.

The resin composition can be obtained by melt-kneading the above-mentioned components using a known kneading apparatus such as a single-screw extruder, a twin-screw extruder, a Banbury mixer, a kneader mixer, or a two-roller. The resin composition can be molded into the fire-resistant expansion sheet (B) by a conventionally known method such as press molding, extrusion molding, or calendar molding.

In the refractory laminate for steel frame covering of the present invention 1, the thickness of the plate material (A) made of a noncombustible material is 0.2 to 0.2.
20 mm is preferred. If it is less than 0.2 mm, it becomes difficult to maintain its shape when heated,
If it exceeds, it is not economical because the amount of use increases. More preferably, it is 0.3 to 10 mm.

The initial thickness of the fire-resistant expansion sheet (B) is 0.1 mm.
5 to 40 mm is preferred. If it is less than 0.5 mm, sufficient heat insulating properties cannot be exhibited even if expanded,
If it exceeds m, the weight increases and handling becomes difficult. The initial thickness refers to the thickness (mm) of the refractory expansion sheet (B) before the heat expansion at 25 ° C.

The fire-resistant expansion sheet (B) expands due to heat when a fire or the like occurs and the temperature of the fire-resistant laminated body for covering a steel frame rises, and is caused by the disappearance of the layer (C) made of a foam or a cushioning material. Fill the space. The thickness of the foam layer is preferably 1 to 60 mm. If it is less than 1 mm, a sufficient expansion allowance cannot be secured, and if it exceeds 60 mm, the handleability during construction deteriorates. Preferably, 5
４０40 mm.

The ratio of the thickness of the fire-resistant expansion sheet (B) to the thickness of the layer (C) made of the foam or the buffer material (the layer (C) made of the foam or the buffer material / the fire-resistant expansion sheet (B)) is 1 to 3. 20 is preferred. If it is less than 1, the space is too small, so that the refractory expansion sheet (B) cannot expand sufficiently. If it exceeds 20, the space becomes too large,
There is a possibility that the heat-resistant heat-insulating layer after expansion collapses and the heat-insulating property cannot be exhibited. The thickness of the entire refractory laminate for steel frame coating is preferably 1 to 100 mm. If it is less than 1 mm, the fire resistance cannot be sufficiently exhibited, and if it exceeds 100 mm, handling becomes difficult.

It is preferable that the fire-resistant laminate for steel frame coating of the present invention 1 is further provided with a nonflammable material layer (E) on the side closest to the steel frame. As the non-combustible material layer, for example,
Ceramic paper, glass fiber non-woven fabric, glass fiber woven fabric,
Metal plates such as iron, aluminum, and stainless steel; metal nets; composite cloths in which aluminum foil is laminated on glass fiber coarse cloth;

Further, the fire-resistant laminate for steel frame covering of the present invention 1 may be laminated with functional layers having various functions. For example, in order to enhance the creep property of the fire-resistant expansion sheet (B), a reinforcing substrate may be laminated as a functional layer adjacent to the fire-resistant expansion sheet (B). The reinforcing base material is not particularly limited as long as it can reinforce the adhesive holding power of the fire-resistant sheet-like molded product during heating, and examples thereof include paper, woven fabric, nonwoven fabric, film, and wire mesh.

As the paper, known papers such as kraft paper, Japanese paper, and K liner paper can be used as appropriate.
Fire resistance when using non-combustible paper highly filled with aluminum hydroxide or calcium carbonate, flame-retardant paper containing a flame retardant or coated on the surface, rock wool, ceramic wool, inorganic fiber using glass fiber, or carbon fiber paper Can be further improved.
As the nonwoven fabric, polypropylene, polyester,
A wet nonwoven fabric made of nylon, cellulose fiber, or the like, or a long-fiber nonwoven fabric can be used. When weighing is used 7 g / m ² less than nonwoven, because the thickness of the molded body may be easily broken, preferably from 8~500g / m ^2. More preferably, it is 10 to 400 g / m ² . As the film, polyethylene, polypropylene, polyamide, polyester, nylon,
A plastic film of acrylic or the like can be used as appropriate. As the wire mesh, a metal lath or the like can be used in addition to a wire mesh or the like that is usually used.

The fire-resistant laminate for covering a steel frame according to the second aspect of the present invention includes a fire-resistant expansion sheet (B) and a corrugated, ridged or ridged sheet on the side of the plate (A) made of a noncombustible material that covers the periphery of the steel frame. It is formed by laminating a layer (D) made of a wire mesh having an uneven shape. The order in which the fire-resistant expansion sheet (B) and the layer (D) made of the wire mesh provided with the corrugations, ridges or irregularities are not particularly limited. (A), (D),
In the case of (B), it is better to laminate the nonflammable material layer (E) on the steel frame side. The plate material (A) made of the non-combustible material and the fire-resistant expansion sheet (B) have been described in detail in the description of the fire-resistant laminate for steel frame coating of the first invention.

Since the layer (D) composed of the wire mesh has a corrugated shape, ridges or irregularities, the layer (D) prevents the fire-resistant expansion sheet (B) from sagging in a fire or the like, and has a role of maintaining the shape. And a layer (D) comprising the wire mesh
Has a corrugated, ridged or uneven shape,
The expansion space of the refractory expansion sheet (B) can be secured. There is no particular limitation on the corrugated, ridged or irregularly shaped wire mesh, for example, an expanded wire mesh or a wire formed by three-dimensionally woven wire,
For example, a corrugated lath, a cobra, a rib lath, and the like can be given.

The thickness of the layer (D) made of a wire mesh provided with the above-mentioned corrugations, ridges or irregularities is 1 to 60 mm.
Is preferred. If it is less than 1 mm, the expansion space of the fire-resistant expansion sheet (B) cannot be sufficiently secured, and
If it exceeds mm, workability will be difficult. The layer (D) made of a wire mesh with corrugations, ridges or irregularities,
It may be laminated on the fire resistant expansion sheet (B) or may be embedded in the fire resistant expansion sheet (B).

The thickness ratio of the fire-resistant expansion sheet (B) to the layer (D) made of a wire mesh with corrugations, ridges or irregularities (the layer made of a wire mesh with corrugations, ridges or irregularities) D) / Fireproof expansion sheet (B)) is preferably 1 to 20. If it is less than 1, the space is too small.
The fire resistant expansion sheet (B) cannot expand sufficiently,
If it exceeds 20, the above-mentioned space becomes too large, and the heat-resistant heat-insulating layer after expansion collapses, so that it may not be possible to exhibit heat insulating properties.

The thickness of the entire refractory laminate for steel frame coating is as follows:
1-100 mm is preferred. If it is less than 1 mm, the fire resistance cannot be sufficiently exhibited, and if it exceeds 100 mm, handling becomes difficult.

The fire-resistant laminate for steel frame covering of the present invention 2 may have functional layers having various functions, such as a reinforcing base material, similarly to the case of the fire-resistant laminate for steel frame covering of the present invention 1. Good.

[0085]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a refractory laminate for covering steel frames according to the present invention.

FIG. 1 is a cross-sectional view schematically showing a first embodiment of the refractory laminate for steel frame covering of the present invention 1. In this refractory laminate 10 for steel frame covering, a stainless steel plate 11 is disposed as a plate material (A) made of a noncombustible material on the outermost layer, and the stainless steel plate 11 is provided on the side facing the H-section steel 15 with:
A fire-resistant expansion sheet (B) 12 and a foam layer (C) 13 are sequentially arranged, and a flat lath wire mesh 14 made of steel is arranged as a non-combustible material layer (E) on the side closest to the steel frame.

As shown in FIG. 1, a stainless steel plate or the like is overlapped by several cm at the seam portion of the refractory laminate 10 for covering a steel frame, and a fixture 16 such as a nail, a screw, a welding pin or the like is placed on the overlapped portion.
Can be fixed to the steel frame. In this refractory laminate 10 for steel frame coating, although the stainless steel plate 11 and the refractory expansion sheet (B) 12 are in close contact with each other,
A gap may be formed between them. Further, for fixation, a calcium silicate plate, a gypsum board, or the like may be used as a base material and adhered to the steel frame, and the fire-resistant laminated body 10 for steel frame coating may be bonded to the base material.

FIG. 2 is a sectional view schematically showing a second embodiment of the refractory laminate for steel frame covering of the present invention 1. In this refractory laminate 20 for steel frame coating, a ceramic wool blanket 21 is arranged as a plate material (A) made of a nonflammable material of the outermost layer, and the other configuration is the same as that of the refractory laminate 10 for steel frame coating. .

FIG. 3 is a cross-sectional view schematically showing a third embodiment of the refractory laminate for steel frame coating of the present invention 1. The refractory laminate 30 for covering a steel frame is an example in which a square steel tubular column 35 is covered, and has the same configuration as the refractory laminate 10 for covering a steel frame except that a bent portion forms a curved surface.

FIG. 4 is a sectional view schematically showing a fourth embodiment of the refractory laminate for steel frame covering of the present invention 1. In this refractory laminate 40 for steel frame covering, in a stainless steel plate 41a in which a member 40a having an open surface and a planar member 40b are extended to both ends of the planar member 40b,
They are connected by fixtures 16 such as nails. The configurations of the fire-resistant expansion sheet (B) 42, the foam layer (C) 43, and the flat steel wire mesh 44 made of steel are the same as those of the fire-resistant laminate 10 for covering a steel frame.

FIG. 5 is a cross-sectional view schematically showing a fifth embodiment of the refractory laminate for steel frame covering of the present invention 1. In this case, the H-section steel 55 or the like installed as a ceiling beam is covered with the refractory laminate 50 for steel frame covering. Since the ceiling beams are covered, one side of the refractory laminate 50 for steel frame covering is completely open, and a fixing portion 50a for fixing to the ceiling is provided.
Are formed at both upper ends. Other configurations are almost the same as the refractory laminate for steel frame coating 10 shown in FIG.

FIG. 6 is a sectional view schematically showing a sixth embodiment of the refractory laminate for steel frame covering of the present invention 1. This refractory laminate for steel frame coating 60 has a cross-sectional shape of the refractory laminate for steel frame coating 60 formed along the periphery of the H-section steel 15 and, similarly to the case of FIG. A plate 61 is disposed, and a refractory expansion sheet (B) 62 and a foam layer (C) are provided on the stainless steel plate 61 on the side facing the steel frame.
63 are sequentially arranged. As described above, the cross-sectional shape of the refractory laminate for steel frame covering 60 may be a shape along the periphery of the steel frame such as the H-section steel 15.

FIG. 7 is a cross-sectional view schematically showing a first embodiment of the refractory laminate for steel frame covering of the present invention 2. In this refractory laminate for steel frame covering 70, a stainless steel plate 71 is disposed as a plate material (A) made of a noncombustible material on the outermost layer, and the stainless steel plate 11 is provided on the side facing the H-shaped steel 15 with:
A fireproof expansion sheet (B) 72 and a corrugated lath 73 are sequentially arranged as a layer (D) made of a wire mesh provided with corrugations, ridges or irregularities.

FIG. 8 is a sectional view schematically showing a second embodiment of the refractory laminate for steel frame covering of the present invention 2. In this refractory laminate for steel frame covering 80, a ceramic wool blanket 81 is arranged as a plate material (A) made of a nonflammable material of the outermost layer. Cobras 83 are sequentially arranged as an inflatable sheet (B) 82 and a layer (D) made of a wire mesh with corrugations, ridges or irregularities.

When a fire or the like occurs in a building equipped with the refractory laminate for steel frame covering and the surrounding temperature rises, the layer (C) made of the foam or the cushioning material disappears or shrinks, The fire resistant expansion sheet (B) expands to the space where the layer (C) made of the foam or the cushioning material was present, thereby forming a heat insulating layer, thereby preventing an increase in temperature of the internal steel frame and the like. be able to.

[0096]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

Example 1 42 parts by weight of butyl rubber, 8 parts by weight of tackifying resin, 50 parts by weight of polybutene, 8 parts by weight of neutralized thermally expandable graphite (CA-60S manufactured by Nippon Kasei Co., Ltd.), and ammonium polyphosphate (Sumitomo) 100 parts by weight of Sumisafe P manufactured by Kagaku Co., Ltd. and aluminum hydroxide (B703S manufactured by Nippon Light Metal Co., Ltd.) were melt-kneaded using a roll to obtain an adhesive resin composition. The obtained resin composition was molded at 90 ° C. by a T-die extruder to obtain a fire-resistant expansion sheet (B) 1 having a thickness of 6 mm. Next, a fire-resistant expansion sheet (B) was placed on a polyethylene foam having a thickness of 8 mm (Softlon SK manufactured by Sekisui Chemical Co., Ltd.).
Then, a stainless steel plate having a thickness of 0.3 mm is laminated and pressed on the fire-resistant expansion sheet (B) 1 and bent so that the stainless steel plate is on the outside, so that the fire-resistant laminated body for steel frame coating 1 is formed. Was manufactured.

Next, as shown in FIG. 1, this refractory laminate 1 for steel frame coating was formed into a 200 mm × 400 mm × 1550 m
m, and fire-tested according to JIS A 1304. Average steel temperature after 1 hour is 330
° C and good results were obtained.

Example 2 Using the same fire-resistant expansion sheet (B) 1 as in Example 1,
After laminating the fire-resistant expansion sheet (B) 1 on a ceramic wool blanket having a thickness of 6 mm (Kao Wool manufactured by Isolite Industries Co., Ltd.), the extruded styrene foam laminate having a thickness of 25 mm was further laminated and pressure-bonded, and the ceramic wool blanket was placed on the outside. By bending so as to make it, the refractory laminate 2 for steel frame coating was manufactured. A fire resistance test was performed on the obtained fire-resistant laminate 2 for steel frame coating in the same manner as in Example 1. As a result, a good result was obtained in which the average steel temperature after one hour was 320 ° C.

Example 3 The same refractory expansion sheet (B) 1 as in Example 1 was produced, and a 10 mm thick corrugated lath (YM manufactured by Yamanaka Seisakusho Co., Ltd.)
After laminating the fire-resistant expansion sheet (B) 1 on top of the above-mentioned corrugated lath, a stainless steel plate having a thickness of 0.3 mm is laminated and pressed.
The stainless steel plate was folded so as to be on the outside, thereby producing a refractory laminate 3 for covering a steel frame.

Next, as shown in FIG. 7, this refractory laminate 3 for steel frame coating was formed into a 200 mm × 400 mm × 1550 m
m, and a fire test was conducted in the same manner as in Example 1. One hour later, the average steel frame temperature was 340 ° C., which was a good result.

Example 4 Cobras (YM-type Cobras manufactured by Yamanaka Seisakusho) was used as a wire mesh provided with corrugations, ridges or irregularities, and the same fireproof expansion as in Example 1 was used as a fireproof expansion sheet (B). Sheet (B) 1 was used. Then, after laminating the fire-resistant expansion sheet (B) 1 on the ceramic wool blanket used in Example 2, laminating and pressing cobras, and bending the ceramic wool blanket to the outside, the fire resistance for steel frame coating was obtained. Laminate 4 (FIG. 8) was produced. A fire resistance test was performed on the obtained refractory laminate 4 for covering a steel frame in the same manner as in Example 1. As a result, a good result was obtained in which the average steel frame temperature after 1 hour was 320 ° C.

Comparative Example 1 The polyethylene foam used in Example 1 and the stainless steel plate were directly bonded with a vinyl acetate-based adhesive without the fire-resistant expansion sheet (B) 1, and fire resistance was obtained in the same manner as in Example 1. A test was performed, but the temperature exceeded 350 ° C. after 10 minutes.

Comparative Example 2 The corrugated lath and the stainless steel plate used in Example 3 were directly bonded with a vinyl acetate adhesive without using the fire-resistant expansion sheet (B) 1, and a fire resistance test was performed in the same manner as in Example 1. I went, but 10
After one minute, the temperature exceeded 350 ° C.

Comparative Example 3 In the case where the fire-resistant laminate 10 for covering a steel frame of Example 1 was used,
The average steel frame temperature after one hour was 330 ° C., but there was a portion exceeding 350 ° C. in one place. Later, when examining the location, the fire resistant expansion sheet (B) 1
Was missing.

[0106]

The fire-resistant laminates for covering steel frames according to the present invention 1 and 2 have the above-mentioned structure, so that they have excellent fire-resistance performance, are easy to be mounted on steel frames and the like, and have excellent workability. It is.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing a first embodiment of a refractory laminate for steel frame coating of the present invention 1. FIG.

FIG. 2 is a cross-sectional view schematically showing a second embodiment of the refractory laminate for steel frame coating of the first invention.

FIG. 3 is a cross-sectional view schematically showing a third embodiment of the refractory laminate for steel frame covering of the present invention 1.

FIG. 4 is a cross-sectional view schematically showing a fourth embodiment of the refractory laminate for steel frame covering of the first invention.

FIG. 5 is a sectional view schematically showing a fifth embodiment of the refractory laminate for steel frame covering of the present invention 1.

FIG. 6 is a cross-sectional view schematically showing a sixth embodiment of the refractory laminate for steel frame coating of the first invention.

FIG. 7 is a cross-sectional view schematically showing a first embodiment of the refractory laminate for steel frame coating of the second invention.

FIG. 8 is a cross-sectional view schematically showing a second embodiment of the refractory laminate for steel frame covering of the second invention.

[Explanation of symbols]

10, 20, 30, 40, 50, 60, 70, 80 Refractory laminate for steel frame coating 11, 41, 51, 61, 71 Stainless steel plate 21, 31, 81 Ceramic wool blanket 12, 32, 42, 52, 62, 72, 82 Fireproof expansion sheet (B) 13, 33, 43, 53, 63 Foam layer (C) 14, 44, 54 Flat lath wire mesh made of steel 15, 55 H-section steel 35 Square steel pipe column 73 Corrugated lath 83 Cobras

Claims (3)

[Claims] 1. A fire-resistant expansion sheet (B) and a layer (C) made of a foam or a cushioning material are laminated on a side of a plate (A) made of a non-combustible material covering the periphery of a steel frame facing a steel frame. Wherein the fire-resistant expansion sheet (B) is made of a resin composition containing a thermoplastic resin and / or a rubber substance, a phosphorus compound and an inorganic filler. Refractory laminate for steel frame coating. 2. A layer comprising a fire-resistant expansion sheet (B) and a wire mesh provided with corrugations, ridges or irregularities on a side of the plate (A) made of a nonflammable material covering the periphery of the steel frame facing the steel frame. A fireproof laminate for steel frame coating obtained by laminating (D), wherein the fireproof expansion sheet (B) comprises a resin composition containing a thermoplastic resin and / or a rubber substance, a phosphorus compound and an inorganic filler. A refractory laminate for steel frame coating, characterized in that: 3. A fire-resistant coated steel structure coated with the fire-resistant laminate for steel frame coating according to claim 1 or 2.