JP2000127297A - Fire-resistant coating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the fire resistance and construction efficiency of a fire- resistant coating material by forming a fire-resistant expansion sheet of a resin composition containing a thermoplastic resin and/or rubber material of specific ratio, neutralized thermally expandable graphite and inorganic filler. SOLUTION: A fire-resistant expandable sheet B in a fire-resistant coating material, wherein a plate material A comprising incombustible materials, the fire-resistant expansion sheet B, and a plate material C comprising incombustible materials are disposed in this order, is formed from a resin composition containing 100 pts.wt. thermoplastic resin and/or rubber material, 10-300 pts.wt. neutralized thermally expandable graphite, and 50-500 pts.wt. inorganic filler. As the thermoplastic resin, a halogenated resin, such as chloroprene resin, chlorinated butyl resin, is preferable since the halogenated resin has a high flame- resistance, and the dehalogenating reaction by heat causes crosslinking and the strength of combustion residues after heating is enhanced. As the rubber material, natural rubber, isoprene rubber, butadiene rubber, etc., are used. As the inorganic filler, hydrous inorganic material and metal carbonate are preferable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fireproof covering material used for columns, beams and the like of general buildings.

[0002]

2. Description of the Related Art In recent years, lightweight steel frames have been used as beams, columns, etc., which are structural materials of buildings in apartment houses and detached houses. Steel frames used as structural materials for such buildings include Ministry of Construction Notification No. 2999 and J.
A fire resistance performance standard is defined by IS A 1304, and a method of coating the surface of a steel frame with a material having excellent fire resistance (fire-resistant coating material) is generally implemented in order to satisfy the standard.

[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, since this coating material needs to be applied or sprayed on the steel frame at the time of construction, there is a problem that the workability is poor. Further, the thickness of the formed refractory coating layer tends to be uneven, and when the unevenness occurs, it is not possible to exert a sufficient body sweat. In addition, cracks may occur in the formed fire-resistant coating layer, and the fire resistance may be reduced.
Further, when sprayed 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., but since two kinds of paints need to be mixed at the time of construction on site, uneven coating easily occurs, and the uniformity with respect to the steel frame. It was difficult to provide fire resistance. Also,
There is also a method of installing a calcium silicate plate so as to surround 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. There is a problem that a large amount of dust is generated when cutting the calcium plate.

Japanese Utility Model Laid-Open Publication No. 62-108748 discloses that a base made of rock wool felt or the like, a ceramic fiber felt and a metal net are superimposed, sewed together with a wire and integrated, and one of the end portions is joined. Disclosed is a refractory coating having ears formed thereon. However, in order to cover a steel frame with the fire-resistant coating material, it is necessary to abut the fire-resistant coating material on the steel frame, alternately overlap the ears and fold the metal mesh to further fold the fire-resistant material. In order to fix the covering 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 Unexamined Patent Publication No. 2-108784 discloses a structure in which a fire-resistant coating is disposed around a steel structure to form a fire-resistant 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 the workability was good. However, since this structure is made of a metal plate and a heat insulating material, its fire resistance is limited, and a thick coating of 40 mm or more is required.

Japanese Patent Application Laid-Open No. Hei 7-133640 discloses that a water-absorbing gel is packed with aluminum-deposited polyethylene,
Further, a coating material wrapped in a ceramic mat is disclosed. However, this has a drawback that the gel portion is cut off at the time of construction, or when the nail is hit, the water-absorbing gel inside leaks out 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 covering material which is excellent in fire resistance performance and which can be easily installed around a steel frame and thus has excellent workability.

[0009]

The refractory coating material of the present invention comprises:
Plate made of non-combustible material (A), fire resistant expansion sheet (B)
And a plate material (C) made of a non-combustible material and a fire-resistant covering material arranged in this order, wherein the fire-resistant expansion sheet (B) is 100 parts by weight of a thermoplastic resin and / or a rubber substance, It is characterized by comprising a resin composition containing 10 to 300 parts by weight of expandable graphite and 50 to 500 parts by weight of an inorganic filler.

[0010] The fire resistant expansion sheet (B) used in the present invention.
Is composed of a resin composition containing a thermoplastic resin and / or a rubber material, neutralized heat-expandable graphite, and an inorganic filler. This resin composition exhibits sufficient fire resistance due to thermal expansion, can be formed into a sheet, and has excellent handleability.

The thermoplastic resin and / or rubber substance is not particularly limited, and examples thereof include polyolefin resins such as polypropylene resins and polyethylene resins, poly (1-) butene resins, polypentene resins, and polystyrene resins. Resin, acrylonitrile-butadiene-styrene resin, polycarbonate resin, polyphenylene ether resin, acrylic resin, polyamide resin, polyvinyl chloride resin, phenol resin, polyurethane resin, polybutene, polyisobutylene, natural rubber (N
R), isoprene rubber (IR), butadiene rubber (B
R), 1,2-polybutadiene rubber (1,2-BR),
Styrene-butadiene rubber (SBR), chloroprene rubber (CR), nitrile rubber (NBR), butyl rubber (I
IR), ethylene-propylene rubber (EPM, EPD)
M), chlorosulfonated polyethylene (CSM), acrylic rubber (ACM, ANM), epichlorohydrin rubber (CO, ECO), polyvulcanized rubber (T), silicone rubber (Q), fluoro rubber (FKM, FZ) urethane rubber ( U) and the like.

Of these, halogenated resins such as chloroprene-based resins and chlorinated butyl-based resins have high flame retardancy per se, and are crosslinked by a heat-induced dehalogenation reaction, resulting in the combustion residue after heating. It is preferable in that the strength is improved. The thermoplastic resin and / or rubber material exemplified above is very flexible and has rubber-like properties, so that the inorganic filler can be filled at a high level, and the obtained sheet-like material is flexible. It is flexible. In order to obtain a more flexible and flexible sheet material, 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 rubber substance may be further crosslinked or modified within a range that does not impair the fire resistance performance of the fire resistant expansion sheet (B). The timing at which the thermoplastic resin and / or rubber substance is cross-linked or modified is not particularly limited, and a cross-linked, modified thermoplastic resin and / or rubber substance may be used in advance, and the neutralization treatment described below may be used. Crosslinking or modification may be performed simultaneously or after blending other components such as heat-expandable graphite and inorganic filler.

[0015] The crosslinking method is not particularly limited, and is a crosslinking method generally used for a thermoplastic resin or a rubber material, for example, a crosslinking method using various crosslinking agents or peroxides, a crosslinking method by electron beam irradiation, or the like. Is mentioned.

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 restricted but includes, for example, monomethylamine, dimethylamine,
Trimethylamine, ethylamine, propylamine, butylamine and the like. The alkali metal compound and the alkaline earth metal compound are not particularly limited,
For example, hydroxides, oxides, carbonates, sulfates, organic acid salts of potassium, sodium, calcium, barium, magnesium and the like can be mentioned. Commercial products of the neutralized heat-expandable graphite include, for example, “GR manufactured by Tosoh Corporation”
EP-EG "and the like.

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 increased, but thermoplastic resin and When kneading with a rubber substance, dispersibility deteriorates, and deterioration of physical properties cannot be avoided.

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. Among these, hydrous inorganic substances and metal carbonates are preferred.

The above-mentioned hydrated inorganic substances such as magnesium hydroxide and aluminum hydroxide endothermic due to water generated by the dehydration reaction at the time of heating, so that the temperature rise is reduced and high heat resistance is obtained, Oxide remains as a residue, which works as an aggregate, which is particularly preferable because the strength of the combustion residue is improved. Magnesium hydroxide and aluminum hydroxide have different temperature ranges in which the dehydrating effect is exhibited, so the combined use expands the temperature range in which the dehydrating effect is exhibited, and a more effective temperature rise suppression effect is obtained. Is preferred.

Metal carbonates such as calcium carbonate and zinc carbonate are considered to promote expansion by the reaction with the phosphorus compound.
In particular, a high expansion effect can be obtained 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.

Among the above metal carbonates, alkali metal carbonates such as sodium carbonate; magnesium carbonate;
Preferred are alkaline earth metal carbonates such as calcium carbonate and strontium carbonate; and carbonates of Group IIb metals of the periodic table such as zinc carbonate.

Generally, the above-mentioned inorganic filler acts as an aggregate, and is considered to contribute to improvement of residue strength and increase of heat capacity. 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
300 μm can be used, and more preferably, about 1 to
50 μm. In addition, it is more preferable to use a combination of an inorganic filler having a large particle diameter and a filler having a small particle diameter. By using the inorganic filler in combination, the filler is highly filled while maintaining the mechanical performance of the refractory expansion sheet (B). It becomes possible.

In the above resin composition, the content of the neutralized heat-expandable graphite is 10 to 300 parts by weight based on 100 parts by weight of the thermoplastic resin and / or rubber substance.
If the content is less than 10 parts by weight, a refractory expansion sheet (B) having sufficient fire resistance cannot be obtained, and if it exceeds 300 parts by weight, the mechanical properties of the refractory expansion sheet (B) deteriorate.

In the above resin composition, the content of the inorganic filler is 50 to 500 parts by weight, preferably 60 to 500 parts by weight, based on 100 parts by weight of the thermoplastic resin and / or the rubber substance.
300 parts by weight. If the content is less than 50 parts by weight, a fire resistant expansion sheet (B) having sufficient fire resistance cannot be obtained,
If the amount exceeds 500 parts by weight, the mechanical properties of the fire-resistant expansion sheet (B) deteriorate.

As the above-mentioned fire-resistant expansion sheet (B), those having adhesiveness are preferable. The term “adhesive” means a property that enables temporary fixing to a plate material (A) or (C) made of a non-combustible 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 bonded to the plate material (A) or (C) made of a nonflammable material,
The workability at the time of producing the refractory coating is improved.

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.

Examples of the tackifying resin include rosin, rosin derivative, dammar, copal, cumarone-indene resin, polyterpene, non-reactive phenol resin,
Alkyd resin, petroleum hydrocarbon resin, xylene resin,
Epoxy resins and the like can be mentioned.

It is difficult for the plasticizer alone to impart tackiness to the fire resistant expansion sheet (B), but the tackiness can be further improved by using the plasticizer in combination with the tackifier resin. As the plasticizer, for example, phthalic acid type, phosphate ester type, adipate ester type, sabatate ester type, ricinoleate ester type, polyester type,
Epoxy plasticizers; paraffin chloride and the like.

The above-mentioned fats and oils have the same action as the above-mentioned plasticizer, and can be used for the purpose of imparting plasticity and as a tackifier. Examples of the fats and oils include animal fats and oils, vegetable fats and oils, mineral oils, silicone oils and the like.

In the above resin composition, a flame retardant, an antioxidant, a metal harm inhibitor, an antistatic agent, a stabilizer, a crosslinking agent, a lubricant, a softener, a pigment, etc., as long as the physical properties of the resin composition are not impaired. May be added.

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

The thickness of the above-mentioned fire-resistant expansion sheet (B) is 0.1 mm.
5 to 40 mm is preferred. When the thickness is less than 0.5 mm, sufficient heat insulating properties are not exhibited even when expanded, and when the thickness exceeds 40 mm, not only the degree of freedom in construction is reduced, but also the weight becomes heavy and the handleability deteriorates. More preferably, it is 0.6 to 6 mm.

The plate (A) made of a non-combustible material used in the present invention is not particularly limited as long as it is made of a non-combustible material. For example, an iron plate, a stainless plate, a stainless steel foil, an aluminum plate, an aluminum foil Metal plates, such as galvanized steel plate, aluminum / zinc alloy plated plate;
Inorganic boards such as 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, slag gypsum board, etc .; rock wool insulation Examples of the sheet include sheet, ceramic wool blanket, alumina silica fiber felt, ceramic paper, aluminum hydroxide paper and the like. The non-combustible material may be a laminate of a plurality of these sheet-like materials.

As the plate (C) made of a noncombustible material used in the present invention, the same as the plate (A) is used. The plate materials (A) and (C) may be the same or different. In addition, it is preferable that a “stop” is provided at an end of the plate material (A) so that it can be easily mounted around a steel frame.

The thickness of the plate material (A) or (C) is set to 0.
It is preferably from 2 to 20 mm, more preferably from 0.3 to 10 mm.
mm. If the thickness is less than 0.2 mm, it is difficult to maintain its shape when heated, and if it exceeds 20 mm, the amount used increases, and the economics are impaired.

The refractory coating material of the present invention [(A) + (B) above)
+ (A)] is preferably 1 to 100 mm. If the thickness is less than 1 mm, the fire resistance is not sufficiently exhibited, and
If it exceeds 0 mm, handling becomes difficult.

The case where the refractory coating material of the present invention is applied to an H-section steel will be described with reference to FIG. First, a plate (C) made of a noncombustible material is disposed around the H-shaped steel. In FIG. 1, four cut sheet-like materials are used as the plate material (C) and are arranged so as to surround the four circumferences of the H-shaped steel. However, continuous sheets are used to wind the four circumferences of the H-shaped steel. May be arranged. Next, the refractory expansion sheet (B) is arranged on the plate (C). It is preferable that the refractory expansion sheet (B) is arranged on the plate (C) without any gap. When the refractory expansion sheet (B) has adhesiveness, it can be easily arranged on the plate (C). Further, a plate material (A) made of a noncombustible material is mounted on the fire resistant expansion sheet (B).

The plate (A) and the fire-resistant expansion sheet (B), or the plate (C) and the fire-resistant expansion sheet (B), or the plate (A) and the fire-resistant expansion sheet (B)
And the plate material (C) may be laminated in advance and integrated, and these laminates may be L-shaped,
It may be preformed into one having a U-shaped cross section or the like. By using such a preform,
It can be easily installed on a steel frame, and the work time on site can be shortened. In addition, by providing "stop margins" at the ears of the plate material (A) or (C), and overlapping and fixing them, it is possible to easily mount around the steel frame.

The fire-resistant expansion sheet (B) expands by receiving heat in the event of a fire or the like and forms a fire-resistant heat-insulating layer without gaps all around the steel frame, thereby preventing heat from being transmitted to the steel frame.

The plate material (A) is preferably a thin metal plate (foil). The thin metal plate absorbs the expansion without breaking or cutting due to deformation or bending when the sheet made of the adiabatic expansion material expands.
The thickness of the metal plate is preferably 0.1 to 1 mm. If the thickness is less than 0.1 mm, it does not function as a flameproofing material or a shape-retaining material, and if it exceeds 1 mm, it becomes difficult to bend, and follows the fire-resistant heat-insulating layer formed by the thermal expansion of the fire-resistant expansion sheet (B). It cannot be deformed and may inhibit the formation of the fire-resistant heat-insulating layer.

(Function) In the present invention, the fire-resistant expansion sheet (B) containing no phosphorus compound is sandwiched between plates made of a non-combustible material so that the fire-resistant heat-insulating layer does not collapse at the time of fire, thereby exhibiting fire-resistant performance. Can be.

[0045]

Embodiments of the present invention will be described below.

Examples 1-3, Comparative Example 1 Butyl rubber, metallocene polyethylene, polybutene, hydrogenated petroleum resin, neutralized heat-expandable graphite, in the amounts shown in Table 1
A resin composition comprising aluminum hydroxide and calcium carbonate was supplied to a twin screw extruder, kneaded, and then extruded to obtain a fire-resistant expanded sheet (B). Next, a plate material (A) made of the non-combustible material shown in Table 1, the above-mentioned fire-resistant expansion sheet (B) and a plate material (C) made of the non-combustible material shown in Table 1 are sequentially laminated to form an L-shaped cross section. A refractory covering made of a body was produced.

As shown in FIG. 1, the two refractory covering materials are arranged around a 300 mm × 300 mm × 1200 mm H-shaped steel, and the “stop” s provided on the lugs of the plate (A). Was mounted around the H-shaped steel by overlapping and fastening with rivets. With respect to the refractory covering material mounted around the H-shaped steel, a fire resistance test was performed in accordance with JIS A 1304, and the surface temperature of the steel frame was measured. The measurement results are shown in Table 1.

[0048]

[Table 1]

The following products were used in Table 1. -Butyl rubber: "# 065" manufactured by Exxon Inc.-Metallocene polyethylene: "EG8200" manufactured by Dow Company-Polybutene: "100R" manufactured by Idemitsu Petrochemical Co., Ltd.-Hydrogenated petroleum resin: "# 5320" manufactured by Tonex Corporation-Thermal expandable graphite: "GREP-EG" manufactured by Tosoh Corporation ・ Aluminum hydroxide: "Heidiride H" manufactured by Showa Denko KK
-31 "-Calcium carbonate:" Whiteton BF-3 "manufactured by Bihoku Powder Co., Ltd.
00 ”・ Rock wool insulation plate: Nichias“ MG felt ”・ Gypsum board: Yoshino Gypsum“ GBR ”・ Metal lath: Yamanaka Seisakusho“ YM type corrugated lath ”

[0050]

The fire-resistant coating material of the present invention has the above-mentioned structure and is excellent in fire resistance performance, and is a plate material (A) made of a nonflammable material, a fire-resistant expansion sheet (B), and a plate material (C) made of a nonflammable material. ) As a pre-integrated laminate,
Excellent workability because it can be easily mounted around steel frames.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing one embodiment of a refractory coating material of the present invention.

Continued on the front page F-term (reference) 2E001 DE01 GA12 GA22 GA24 HA01 HA03 HA21 HB02 HB03 HB04 HC01 HD11 HD14 HE01 JA04 JA06 JA22 JA26 JA29 JB01 4F100 AA00B AA00H AA08 AA19 AA37B AA37H AK01B AK04 AN07 AK00 AR00C BA03 BA06 BA10A BA10C CA23B GB07 JA02B JB16B JJ07 JJ07A JJ07C 4J002 AC011 AC031 AC041 AC061 AC081 AC091 AC111 BB031 BB041 BB121 BB141 BB171 BB271 BC031 DE0417 BG2711 DE137 DE147 DE237 DE247 DE287 DF017 DJ007 DJ017 DJ037 DJ047 DJ057 FB076 FD017 GL00

Claims (1)

[Claims] 1. A fire-resistant covering material in which a plate (A) made of a non-combustible material, a fire-resistant expansion sheet (B) and a plate (C) made of a non-flammable material are arranged in this order. ) Comprises 100 parts by weight of a thermoplastic resin and / or rubber substance, 10 to 300 parts by weight of neutralized thermally expandable graphite, and 50 to 500 parts by weight of an inorganic filler. Features fire-resistant coating material.