JPH11141011A - Refractory composite structure and method of coating the same - Google Patents

Abstract

(57) [Problem] To provide a refractory composite structure excellent in workability and fire resistance, and a method for coating the same. SOLUTION: The outer periphery of H steel 1 is covered with a fire-resistant coating material 3 in which a layer (A) 5 made of a non-combustible material and a fire-resistant expansion sheet (B) 4 are laminated, and the fire-resistant coating material 3 is formed.
Heat absorbing members 2-1 and 2-2 containing 20% by weight or more of a hydrated inorganic substance are arranged in a gap between the H steel 1 and the H steel 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a column, a beam,
The present invention relates to a fire-resistant composite structure used for a steel frame such as a wall, which can be easily installed and has excellent fire resistance performance, and a method of covering the same.

[0002]

2. Description of the Related Art With the rise of buildings, lightweight steel frames have been used as beams, columns, etc., which constitute structural materials of buildings. For steel frames used as structural materials for buildings, fire resistance performance standards are determined by the Ministry of Construction Notification No. 2999 and JIS A1304, and in order to satisfy the standards, the surface of the steel frame has excellent fire resistance. It is common practice to coat with a material.

[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 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] For this purpose, fireproof paints are commercially available from, for example, Mitsui Kinzoku Paints Co., etc. However, since it is necessary to mix two kinds of paints at the construction site, uneven coating easily occurs, and It was difficult to impart uniform fire resistance to the steel. There is also a method of installing a calcium silicate plate around the steel frame.However, it is necessary to use a thick calcium silicate plate and fix it with a large amount of nails, screws, etc. In addition, there is a problem that a large amount of dust is generated when cutting the calcium silicate plate.

Japanese Utility Model Laid-Open Publication No. Sho 62-163206 discloses that a base material such as rock wool felt, a ceramic fiber felt, and a mesh material are superimposed, sewed together with a wire and integrated, and one end of a butt is formed. Discloses a fire-resistant covering material having ears formed thereon. 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.

Further, 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 on a 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
It consists only of a metal plate and a heat insulating material, and its fire resistance is limited, so a thick coating of 40 mm or more was required.

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

[0008]

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a fire-resistant composite structure having excellent workability and fire resistance, and a method for coating the same.

[0009]

According to the present invention, there is provided a fire-resistant composite structure comprising a fire-resistant covering material formed by laminating a layer (A) made of a nonflammable material and a fire-resistant expansion sheet (B) on the outer periphery of H steel. It is characterized in that a heat absorbing member containing 20% by weight or more of a hydrated inorganic substance is disposed in a gap between the refractory coating material and the H steel.

The refractory coating material used in the present invention is formed by laminating a layer (A) made of a nonflammable material and a refractory expansion sheet (B).

The layer (A) made of the above noncombustible material is not particularly limited, and examples thereof include an iron plate, a stainless plate, an aluminum plate, an aluminum / zinc alloy plated steel plate, a surface-treated steel plate, a titanium plate, and an enameled steel plate. , Fluororesin coated steel sheet,
Metal plates represented by clad steel plates, copper plates, etc .; calcium silicate plates, calcium carbonate plates, gypsum boards, perlite cement plates, rock wool plates, slate plates, ALC plates,
Ceramic plates, mortars, precast concrete plates, glass fiber reinforced concrete plates, inorganic plates represented by composites of cement and wood chips, and the like. In the present invention, a plurality of the above metal plates or inorganic plates may be laminated, and a surface treatment may be performed for coloring or designing.

When an inorganic plate is used as the layer (A),
In this case, the density of the inorganic plate is 0.2 to 2.5 gf / cm.
^ThreeIs more preferable, and more preferably, 0.3 to 2.2 gf /
cm ^ThreeIt is. Density is 0.2gf / cm^ThreeIs less than
And, there is a risk that the heat resistance decreases and the flame penetrates,
2.5gf / cm^ThreeIf it exceeds, the workability is poor.

The fire-resistant expansion sheet (B) is preferably formed of a resin composition containing a thermoplastic resin and / or a rubber component, a phosphorus compound, neutralized heat-expandable graphite, and an inorganic filler. .

The thermoplastic resin and / or rubber component is not particularly restricted but includes, for example, polyolefin resins such as polypropylene resins and polyethylene resins, poly (1-) butene resins, polypentene resins,
Polystyrene resin, acrylonitrile-butadiene-
Styrene resin, polycarbonate resin, polyphenylene ether resin, acrylic resin, polyamide resin, polyvinyl chloride resin, 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 ( CSM), acrylic rubber (AC
M, ANM), epichlorohydrin rubber (CO, EC
O), multi-vulcanized rubber (T), silicone rubber (Q), fluorine rubber (FKM, FZ), urethane rubber (U), etc., and these may be used alone or in combination of two or more. May be done. Furthermore, melt viscosity of resin, flexibility,
For adjusting the adhesiveness or the like, a blend of two or more resins may be used as the base resin.

Halogenated resins such as the above-mentioned chloroprene-based resins and chlorinated butyl-based resins are themselves highly flame-retardant, and crosslink occurs by a dehalogenation reaction by heat.
This is preferable in that the strength of the residue after heating is improved. The thermoplastic resin and / or rubber component exemplified above are very flexible and have rubber-like properties, so that the phosphorus compound and the heat-expandable graphite can be highly filled, and the resulting fireproof The expansion sheet (B) becomes flexible and flexible. In order to obtain a more flexible and flexible fire resistant expansion sheet (B), a non-vulcanized rubber or a polyethylene resin is preferably used.

As the polyethylene resin, for example,
Ethylene homopolymer, copolymer containing ethylene as a main component, a mixture thereof, ethylene-vinyl acetate copolymer,
Examples include an ethylene-ethyl acrylate copolymer and an ethylene-methacrylate copolymer. Examples of the copolymer containing ethylene as a main component include, for example, copolymers of ethylene containing ethylene portion as a main component and another α-olefin.
Hexene, 4-methyl-1-pentene, 1-octene,
Examples thereof include 1-butene and 1-pentene.

The thermoplastic resin and / or rubber component may be further crosslinked or modified within a range that does not impair the fire resistance performance of the fire resistant expansion sheet (B) of the present invention. The timing at which the thermoplastic resin and / or rubber component is crosslinked or modified is not particularly limited, and a previously crosslinked, modified thermoplastic resin and / or rubber component 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 component. May be performed at any stage.

The method for crosslinking the thermoplastic resin and / or rubber component is not particularly limited, and a crosslinking method usually performed for the thermoplastic resin or rubber component, for example, a method using various crosslinking agents, peroxides, etc. A method using electron beam irradiation and the like can be given. As for the non-vulcanized rubber, it may be vulcanized after compounding a phosphorus compound, neutralized heat-expandable graphite, an inorganic filler, and other additives.

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]

Embedded image

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-mentioned ammonium polyphosphates are not particularly restricted but include, for example, ammonium polyphosphate and melamine-modified ammonium polyphosphate. Of these, ammonium polyphosphate is preferably used from the viewpoint of handleability. As commercially available products, for example, “AP manufactured by Hoechst”
422 "," 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 neutralized heat-expandable graphite is obtained by neutralizing heat-expandable graphite which is a conventionally known substance. The heat-expandable graphite is a natural scale-like graphite, pyrolytic graphite, powder such as quiche graphite,
Produced by treating with inorganic acids such as concentrated sulfuric acid, nitric acid, and selenic acid and strong oxidizing agents such as concentrated nitric acid, perchloric acid, perchlorate, permanganate, dichromate, and hydrogen peroxide. It is a graphite intercalation compound that is a crystalline compound while maintaining a layered structure of carbon.

The thermally expandable graphite obtained by the acid treatment as described above is further neutralized with ammonia, an aliphatic lower 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 above-mentioned alkali metal compound and alkaline earth metal compound are not particularly restricted but include, for example, hydroxides, oxides, carbonates, sulfates, organic acid salts of potassium, sodium, calcium, barium, magnesium and the like. Is mentioned.

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 component, dispersibility deteriorates, and deterioration of physical properties cannot be avoided.

Commercial products of the neutralized heat-expandable graphite include, for example, "CA-60S" manufactured by Nippon Kasei Co., Ltd. and "GREP-EG" manufactured by Tosoh Corporation.

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 carbonates such as magnesium carbonate, calcium carbonate, magnesium carbonate, zinc carbonate, strontium carbonate, barium carbonate; calcium salts such as calcium sulfate, gypsum fiber, calcium silicate; silica, diatomaceous earth, dawn knight, and sulfuric acid barium,
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, resulting in a reduction in temperature rise to obtain high heat resistance, and a heat residue. 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 reaction with ammonium polyphosphate when ammonium polyphosphate is used as the phosphorus compound. In addition, it acts as an effective aggregate and forms a residue having high shape retention after burning.

In general, since the inorganic filler acts as an aggregate, it is considered that it contributes to the improvement of the residue strength and the increase of the heat capacity. Even if the inorganic filler is used alone,
Two or more kinds may be used in combination.

The particle size of the inorganic filler is 0.5 to
100 μm is preferred, more preferably 1 to 50 μm
It is. If the particle size is less than 0.5 μm, secondary agglomeration occurs and dispersibility deteriorates. On the other hand, when the particle size exceeds 100 μm, the surface properties of the molded article and the mechanical properties of the resin composition deteriorate.

When the amount of the inorganic filler to be added is large, it is preferable to reduce the viscosity of the resin composition and improve the moldability by selecting and using one having a large particle diameter in the above range. Further, it is more preferable to use a combination of a large particle size inorganic filler and a small particle size,
By the combination, higher filling can be achieved.

In the resin composition for the fire-resistant expansion sheet (B), the compounding amount of the phosphorus compound and the neutralized heat-expandable graphite is the same as that of the thermoplastic resin and / or rubber component 1
The total amount is more preferably 20 to 300 parts by weight, more preferably 20 to 200 parts by weight, based on 00 parts by weight. The compounding amount of the inorganic filler is preferably 20 to 500 parts by weight, more preferably 60 to 300 parts by weight, based on 100 parts by weight of the thermoplastic resin and / or rubber component.

The weight ratio of the neutralized heat-expandable graphite to the phosphorus compound [(neutralized heat-expandable graphite)
/ (Phosphorus compound)] is preferably from 0.05 to 1. The weight ratio of the neutralized heat-expandable graphite to the phosphorus compound is
By setting the content to 0.05 to 1, 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.

Although the fire resistance performance of the resin composition for the fire resistant expansion sheet (B) is not necessarily clear, it is considered that the fire resistance is expressed 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.

The resin composition for the fire-resistant expansion sheet (B) contains a flame retardant, as long as the physical properties of the resin composition are not impaired.
Various additives such as antioxidants, metal damage inhibitors, antistatic agents, stabilizers, crosslinking agents, lubricants, softeners, pigments and tackifiers may be added.

In particular, it is preferable to add a tackifier in order to impart tackiness to the fire resistant expansion sheet (B). Workability can be improved by imparting tackiness. General-purpose substances can be used as the tackifier,
For example, tackifier resins, plasticizers, oils and fats, low-molecular high polymers, and the like can be used.

The above resin composition is, for example, a single screw extruder,
Twin screw extruder, Banbury mixer, kneader mixer,
It is obtained by melt-kneading the components using a known kneading device such as a two-roll mill. The obtained resin composition,
For example, the fire-resistant expansion sheet (B) can be obtained by forming the sheet into a sheet by a conventionally known forming method such as press molding, extrusion molding, or calendar molding.

The refractory expansion sheet (B) preferably has an initial bulk density at 25 ° C. of 0.8 to 2 g / cm ³ . 0.8 to 2 g / c of initial bulk density at 25 ° C
By setting it within the range of m ³ , physical properties such as heat insulation and fire resistance required for the fire-resistant expansion sheet (B) are not impaired, and workability can be improved.

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 fire-resistant expansion sheet (B) becomes too large, and thus the work such as the work of attaching a large-area fire-resistant expansion sheet (B). Is reduced. More preferably, 1 to 1.8 g / cm
³

The refractory 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 initial thickness of the fire resistant expansion sheet (B) is preferably 0.5 to 40 mm. If it is less than 0.5 mm, it does not exhibit sufficient heat insulation even if expanded,
If it exceeds, the weight increases, and a problem occurs in the workability.
More preferably, it is 1 to 15 mm. Here, the initial thickness refers to the thickness (mm) of the refractory expansion sheet (B) before thermal expansion at 25 ° C.

The heat absorbing member used in the present invention contains at least 20% by weight of a hydrated inorganic substance. The hydrated inorganic substance has a characteristic of exhibiting an endothermic effect by being dehydrated when heated. By using the hydrated inorganic substance in combination with the refractory expansion sheet (B), more excellent refractory heat insulation performance is realized. In particular, the periodic table
Hydroxides of metals belonging to Group II and Group III are preferable in that they retain their shape firmly after burning through a foamed fired product. Specific examples include magnesium hydroxide, aluminum hydroxide, calcium hydroxide, hydrotalcite, and the like.

The above-mentioned hydrated inorganic substance may be in the form of a powder filled in a container, or may be a mixed composition with a thermoplastic resin and / or a rubber component. The mixed composition preferably contains a thermoplastic resin and / or a rubber component and aluminum hydroxide. The content of the aluminum hydroxide is 30 parts by weight per 100 parts by weight of the thermoplastic resin and / or the rubber component. ~ 300 parts by weight are preferred.

It is preferable that the heat absorbing member be present in the recess of the H steel, and it is more preferable that the heat absorbing member be in close contact with the inner surface of the recess of the H steel.

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a schematic sectional view of a fire-resistant composite structure of the present invention. Heat absorbing members 2-1 and 2-2 are arranged in upper and lower concave portions of H steel 1, and fireproof covering material 3 is installed so as to surround the entire H steel 1. The refractory coating material 3 is installed such that the refractory expansion sheet (B) 4 is on the H steel 1 side and the board (A) made of a noncombustible material is on the outer peripheral side. The heat-absorbing members 2-1 and 2-2 and the refractory coating material 3 that are coated on the outside of the H steel 1 can be fixed with, for example, screws or bolts.

The refractory composite structure of the present invention can be easily prepared by disposing the heat absorbing members 2-1 and 2-2 in the recesses of the H steel 1 and then covering the outer periphery of the H steel 1 with the refractory coating material 3. Obtainable.

(1) Preparation of fireproof coating material 42 parts by weight of butyl rubber, 8 parts by weight of tackifier resin, 50 parts by weight of polybutene, 100 parts by weight of neutralized heat-expandable graphite (“CA-60S” manufactured by Nippon Kasei Co., Ltd.) Parts and 100 parts by weight of aluminum hydroxide ("B703S" manufactured by Nippon Light Metal Co., Ltd.) were supplied to two rolls and kneaded to obtain a resin composition.
The obtained resin composition was molded at 90 ° C. using a T-die extruder to obtain a 6 mm-thick refractory expansion sheet. The fire resistant expansion sheet and a 0.3 mm thick stainless steel plate were pressure-bonded and laminated as shown in a schematic cross-sectional view in FIG. 2 to produce a fire resistant coating material.

(2) Preparation of heat absorbing member (a) In order to install the heat absorbing member along the steel surface in the concave portion of H steel,
After preparing a stainless steel container having a depth of 0 mm, the container is filled with aluminum hydroxide so as not to leave a space, and the container is covered with a 200 mm thick glass cloth, and the heat absorbing member shown in FIG. (A) was prepared.

(3) Preparation of heat-absorbing member (b) 42 parts by weight of butyl rubber, 8 parts by weight of tackifying resin, 50 parts by weight of polybutene and 200 parts by weight of aluminum hydroxide ("B703S" manufactured by Nippon Light Metal Co., Ltd.) are rolled into two rolls. The mixture was supplied and kneaded to obtain a resin composition. The obtained resin composition,
A heat absorbing sheet having a thickness of 10 mm was formed at 90 ° C. using a T-die extruder, and a stainless steel sheet having a thickness of 0.3 mm was pressure-bonded and laminated on the heat absorbing sheet to prepare a heat absorbing member (b) shown in FIG. .

(Example 1) 200 mm (width) x 400 m
m (height) x 1550 mm (length) in the recess of H steel 1
The heat absorbing member (a) was disposed so that the glass cloth side was in contact with the heat absorbing member, and the outer periphery of the H steel 1 was covered without gap so that the stainless steel side of the refractory coating material was on the outside.
Was obtained. As a result of performing a fire resistance test on this fire resistant composite structure in accordance with JISA1304, the average back surface temperature was 313 ° C. 60 minutes after the start of the test.

Example 2 200 mm (width) × 400 m
m (height) x 1550 mm (length) in the recess of H steel 1
The heat-absorbing member (b) is coated so that the stainless steel side is on the outside, and the outer periphery of the H steel 1 is further covered without any gap so that the stainless steel side of the fire-resistant coating material is on the outside. A construct was obtained. As a result of performing a fire resistance test on this fire resistant composite structure in accordance with JIS A1304, the average backside temperature was 337 ° C. 60 minutes after the start of the test.

Example 3 200 mm (width) × 400 m
m (height) x 1550 mm (length) in the recess of H steel 1
The heat-absorbing member (a) is coated so that the stainless steel side thereof is on the outside, and the outer periphery of the H steel 1 is coated without any gap so that the stainless steel side of the refractory coating material is on the outside.
Was obtained. As a result of performing a fire resistance test on this fire resistant composite structure in accordance with JISA1304, the average backside temperature was 321 ° C. 60 minutes after the start of the test.

Comparative Example 1 As shown in FIG.
The outer periphery of the H steel 1 was covered with the refractory coating material 3 without disposing the heat absorbing member in the concave portion of Example 3 to obtain a refractory composite structure. As a result of performing a fire resistance test on this fire resistant composite structure in accordance with JIS A1304, the average backside temperature was 350 ° C. 37 minutes after the start of the test.
Exceeded.

[0057]

The fire-resistant composite structure of the present invention has the above-described structure, and can form an expanded heat-insulating layer at the time of heating, and can prevent the invasion of a flame by a fire-resistant coating material that retains its shape.
Further, the temperature rise of the H steel can be reduced by the refractory coating material and the heat absorbing member. Therefore, remarkable fire resistance can be imparted to the structure, and the structure can be used for a wide range of applications.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing a fire-resistant composite structure of an example.

FIG. 2 is a schematic sectional view showing a refractory coating material.

FIG. 3 is a schematic sectional view showing a heat absorbing member (a).

FIG. 4 is a schematic sectional view showing a heat absorbing member (b).

FIG. 5 is a schematic sectional view showing a fire-resistant composite structure of Comparative Example 1.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 H steel 2-1 and 2-2 Heat absorption member 3 Fireproof covering material 4 Fireproof expansion sheet (B) 5 Board (layer) made of noncombustible material (A)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08K 3:04 3:22)

Claims (5)

[Claims] 1. An outer periphery of H steel is coated with a fire-resistant coating material in which a layer (A) made of a non-combustible material and a fire-resistant expansion sheet (B) are laminated, and the fire-resistant coating material and H steel are coated. A heat-absorbing member containing at least 20% by weight of a hydrated inorganic substance is disposed in the gap. 2. The fire-resistant composite structure according to claim 1, wherein a heat-absorbing member is disposed in a recess of the H-steel, and an outer periphery of the H-steel is wrapped by a fire-resistant covering material. 3. The heat-absorbing member comprises a thermoplastic resin and / or a rubber component and aluminum hydroxide, and 30 to 300 parts by weight of aluminum hydroxide based on 100 parts by weight of the thermoplastic resin and / or rubber component. The refractory composite structure according to claim 1 or 2, wherein 4. The fire-resistant expansion sheet (B) is formed from a resin composition containing a thermoplastic resin and / or a rubber component, a phosphorus compound, neutralized heat-expandable graphite, and an inorganic filler. The content is the total amount of the phosphorus compound and the neutralized heat-expandable graphite of 20 to 300 with respect to 100 parts by weight of the thermoplastic resin and / or rubber component.
Parts by weight, and 20 to 500 parts by weight of an inorganic filler, and the weight ratio of the neutralized heat-expandable graphite to the phosphorus compound (neutralized heat-expandable graphite / phosphorus compound)
Is 0.05 to 1.
The refractory composite structure according to any one of the above. 5. After disposing a heat absorbing member in a concave portion of H steel,
A method for coating a refractory composite structure, comprising coating an outer periphery of steel with a refractory coating material.