JPH0730595B2 - Composite flexible sheet fireproof coating and fireproof coating method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The columns and beams that are structural steel frames of high-rise buildings are obliged to have a fireproof coating for fire prevention and disaster prevention specified in JIS A 1304. In practice, the rock wool spraying method is used heavily because it is cheap and easy to construct, but there are problems in preventing pollution at the site and quality control of the specified thickness, and further deterioration of air oxidation causes It is a well-known fact that it is difficult to secure long-term durability of a part. In addition, in terms of process control of super high-rise buildings, prefabricating the fire-resistant coated steel frame is thought to bring about great advantages in process shortening and quality control. Furthermore, the parking lot where the steel frame coating appears appears to deteriorate quickly,
There was no choice but to paint organically. If the fire-resistant coating material is made into a sheet, the above problems can be solved, and it becomes a long-term durable material, has an aesthetic appearance, can be prefabricated, and has a wide range of applications.

(Prior art) Logically, it has been considered for a long time that process control can be facilitated by prefabricating the refractory coating, but the biggest difficulty is the damage during transportation and the repair method, which can be realized. There wasn't. That is, there was no material having a durable strength for transportation.

The binder used in the conventional rock wool spraying method is cement, but it is necessary to reduce the weight to produce fire insulation and to reduce the weight so that the steel frame has adhesiveness, and the amount of air is large. Therefore, it is logical to promote carbonation by air inflow. Even if we consider aging repair, there are some parts that are virtually impossible. Although the rock wool spraying method is often used because it is cheap, if the construction cost and the scaffolding and curing costs provided by the contractor are added, the necessary cost is not the same as the integrated price. In addition, deterioration over time may occur, and particularly in the blow-through portion, the deterioration is promoted, which may cause environmental pollution. Above all, if there is something that can not be dealt with due to deterioration at the time of a disaster, it is a terrible thing.

(Problems to be Solved by the Invention) First, as a method of solving the prefabrication of the fireproof coating, a rigid material is easily damaged by an impact, and therefore a material having a high restoring property and a cushioning property is preferable. Since the light weight heat insulating material has low strength, it must be reinforced, but a metal is preferable to enhance impact resistance and abrasion resistance, and a light weight flexible stainless metal foil having good corrosion resistance is preferable. However, since the adhesive compounded with each other needs to have fire resistance for 3 hours, the organic adhesive cannot be used from this viewpoint. For example, even with water glass, it is possible to make a fireproof adhesive that is thin and does not cause cracks at 800 ° C or lower, but it is difficult to make it flexible in the normal state and it is difficult to hold it without cracks at 1000 ° C or higher. There is also a method of mixing a filler such as aluminum hydroxide or magnesium hydroxide, which releases a large amount of water of crystallization at the time of fire resistance, but there is a problem that it does not become flexible.

The present invention, previously proposed by the present inventor, by using an aqueous film-forming inorganic compound as an adhesive material, good adhesion to metal, particularly corrosion-resistant stainless steel, mixed with an amorphous filler. It was possible to solve the above problems by improving the build-up property and the storability and imparting flexibility.

(Means for Solving the Problems) PH7 to PH9 are obtained by adding hydrated and dissociated hydrofluoric acid or boric acid to a concentrated solution reaction of a metal and an alkali metal used in the present invention.
Or, a water-soluble film-forming inorganic compound having a pH of 11 to 12.6 was obtained. Its chemical composition is [AaBb] rCcDd or [Aa, BbCcDd] sCpDq where A ... Al, Si B ... FH, H, BH ₃ , B ₂ O ₃ C ... Na, K, Li D ... H ₂ O, OH a , b, c, d, p, q, r, s ... It is an aqueous film-forming inorganic compound estimated to have a number of moles.

Differential thermal analysis of 43% solids of A ... Si (metal silicon), B ... FH, C ... Na, D ... OH or H ₂ O, which is one of the varieties, is abbreviated as P-Si-F-N. Shown in the figure.

There is excess water dehydration at 170 ℃ ~ 80 ℃, and crystal water dehydration near 470 ℃, 580 ℃, 650 ℃, but there is little change in weight until 250 ℃ transition to 800 ℃ or more, and it is difficult for cracks to occur. Is shown. Kaolin 15 as a filler, for example, in the article
Parts, 35 parts of amorphous pozzolan, 5 parts of diatomaceous earth, totaling 55 parts, the viscosity became 400 cps to 1400 cps. The formulation of the present invention is not limited to the above examples. A sample of 10 cm x 10 cm obtained by applying the adhesive material to a 30 μ stainless steel foil, applying it to an alumina silica blanket (Isolite 8p) 12.5 m / m, and further adhering the stainless steel and blanket with the same adhesive material. Was placed in an electric furnace and kept at 1200 ° C. for 3 hours, but neither peeled nor cracked. Similar to the adhesive material of the present invention, the same kind of filler was added to No. 3 water glass and the same test was conducted, but cracks and peeling were partially generated. Among the inorganic fibrous heat insulating materials, it is the alumina / alumina-silica type that has a heat resistance of 1000 ° C or higher. However, according to "Temperature and Thermal Conductivity" in Fig. 2 (Building Materials Handbook, Koichi Kishitani, P.461), lightweight insulation materials tend to increase their thermal conductivity in the high temperature region and decrease their thermal insulation. Indicates. Also, "moisture content and thermal conductivity" (see the same P.46 as above)
In 0), the presence of water causes an increase in heat conduction of the lightweight heat insulating material, that is, a decrease in heat insulating property. As shown in the differential thermal analysis, the fire-resistant adhesive material of the present invention has two peaks of dehydration of water of crystallization (FIG. 1). As shown in Table 1, the heat insulation of the blanket alone shows excellent results.

Further features of the present invention will be described. 25 m / m (8P) of the composite fireproof coating material of the present invention is composed of the blanket 45
It shows excellent performance equivalent to ~ 50m / m. Insulation performance is
Solid heat conduction, convection heat conduction, radiant heat conduction is determined by a composite, but the fireproof coating material of the present invention has good heat insulation performance at medium and high temperatures based on the metal foil of the surface material and the adhesive coating performance. . If the metal foil on the surface is destroyed by the heating frame, it is close to the performance of the blanket alone, but if the heat resistance of the metal foil is maintained, the radiation heat reflection effect is generated and convection heat conduction is controlled. This can be proved by the following examples.

Since the fireproof coating material of the present invention is a flexible sheet, it is necessary to treat the attached joint. The present invention is heat resistant
0.5 m / m-5 m / m alumina silica paper having a temperature of 1000 ° C. or higher and 50 μ stainless steel are compounded by the adhesive of the present invention,
A flexible thin film sheet (tape) was prepared. The above-mentioned problems were solved by gluing the fireproof coating tape having a wide width enough to conceal the joint joint to the joint joint portion with the adhesive of the present invention and integrating the fireproof coating material.

The fire-resistant coating material of the present invention has a thickness of 30 m / m even when compounded, and has a pressure of 6 kg / m ²
(<D = 0.2, where D is the specific gravity). The fire-resistant adhesive material of the present invention has an adhesive force (shear peel strength) of 28 g / cm at the time of adhesion.
It is ² , but when temporarily fixed with tape, the blanket absorbs water and the adhesive strength after 1 hour becomes 3.2 kg / cm ² or more, and if you attach several points of dumpling (4 cm × 4 cm), It shows a safe adhesive strength and increases to 30 kg / cm ² after 4 weeks of adhesion. Adhesive strength occurs when there are four 20 cm ² adhesive points. However, in order to seek further long-term safety, it is better to electrodeposit the sudad and fix it, as in the case of using a glue joint. There are various known methods for this stud, but since the product of the present invention is thin, the T-pin method of temporarily fixing with tape and penetrating from the surface to the steel frame for electrodeposition as described above is advantageous in terms of workability. is there. There is also a method of setting up the stud in advance and inserting the stud, and any shape, length, and fixing method of the stud may be adopted. Therefore, the bonding and the stud can be used individually, but it is preferable to use them together for safety.

Materials used in the present invention will be described. As the metal foil, any metal can be used, but stainless steel foil is preferable for corrosion resistance,
In terms of its fire resistance, stearite is better than ferrite, and it has flexibility of 20 to 10 to maintain fire resistance.
0μ is suitable. Inorganic fibrous insulation is practically wool or felt blanket, and joint coating is good for paper products, such as alumina, alumina-silica, boron, silicon nitride products, heat resistance 1000 ℃ ~ 1200 ℃
A product with the performance of is desirable. The thickness of the inorganic fibrous heat insulating material is economically selected from 10 to 40 m / m depending on the fire resistance time, but a needle punched alumina-silica blanket or felt is suitable. The adhesive may be any of the four types of the water-based film-forming inorganic compound of the present invention in Table 2 or an intermediate product thereof, and the compounding of the filler causes the above-mentioned initial adhesive force, cures without cracks and peeling, and has fire resistance. It is necessary to produce properties, and a product containing 10% to 100% of the aqueous film-forming inorganic compound is desirable. Next, examples of the present invention will be described.

The mineral fiber used in the adhesive of the present invention is a fiber composed of a mixture of magnesia and silica, and the layer compound is a material containing diatomaceous earth / mica as a main material.

(Example-1) In Table 2, 20 parts of carion, 30 parts of pozzolan, 3 parts of diatomaceous earth,
1 part glycerin was added to make a fire-resistant adhesive, and various materials such as stainless steel 50μ of Takeuchi Metal Foil Co., Ltd. and thickness 10m / m inorganic fiber heat insulating material were pasted together, and fireproof test at 1000 ° C for 2 hours (electric furnace) was performed. , Glass wool, primary fired carbon wool, and rock wool all ignited, and alumina silica felt, blanket, and paper remained.

All papers were degraded by pulp inclusions. That is, as a matter of course, a heat-resistant material having a temperature of 1000 ° C. or higher must be used as the composite composition material. In the previous example, the fire-resistant adhesive material of the present invention did not cause peeling or cracking. However, when the total amount of each filler was 150% or more based on the solid content of each product in Table 2, flexibility was lost.

As a comparative example, aluminum hydroxide on water glass (No. 3),
Magnesium hydroxide, kaolin, silica fume, pozzolan, pyrophyllite, diatomaceous earth and various other materials were added and coated on a 30μ stainless steel foil, and the flexibility was examined. It was heated at 1150 ° C. for 3 hours, and at this temperature, no part was adhered without cracks even if partly adhered. Also, the proportion of filler mixed is 5%
From 100%.

(Example-2) An alumina-silica blanket having a thickness of 8P25m / m was applied to a ferrite-based stainless steel (A) and an austenitic stainless steel (B) with a thickness of 50 µF, and the fire-resistant adhesive material of the present invention of Example-1 to 250g / m. ^It was coated and adhered at a ratio of ² to form a composite (300 m / m
× 300m / m). According to the old JIS A 1302 method, it was placed on a 3.2 m / m thick iron plate and heated for 3 hours. In (A), the surface deteriorated and damage was observed after 2 hours, and the back surface temperature became 450 ° C. or higher, so the test was stopped. In (B), the surface metal foil taken out at 320 ° C. on the back side had no damage even after 3 hours had passed, and the fire resistance of the surface metal foil and the fire-resistant adhesive material controlled the performance. If the blanket is 40 m / m, the backside temperature is 2
It was 00 ° C.

(Example-3) The above-mentioned Example (B) was divided into two, and this was spot-bonded to a 10 m / m thick iron plate with the adhesive of the above-mentioned Example-1, and a blanket was 2.5 m / m on the divided attachment surface. The fireproof coating-like tape of the present invention was prepared in place of thick paper, and this 5 cm width was adhered with the same adhesive to cover the entire iron plate. This is the same as in Example-1.
Fire resistance was tested for 3 hours in the same manner as in. The back surface temperature was 310 ° C. for the iron plate, the surface stainless steel was not damaged, and neither the point adhesive material nor the adhesive material with the metal foil was peeled or cracked.
FIG. 3 shows the standard heating curve in each part of the furnace, and FIG. 4 shows the backside iron plate temperature.

(Example-4) With a stud welder of Nippon Drive It Co., Ltd., T
The pins were electrodeposited from the surface of the fire-resistant coating material of the present invention of the previous Example-1. In this case, it is electrodeposited, but the fire-resistant coating material of the present invention is thin with a thickness of 30 m / m or less, is easy to install, and has the same performance, and when it is installed with a blanket, it requires a thickness of 50 to 60 m / m. It requires more studs than the construction method. If the surface is post-installed to adhere stainless steel, the amount of adhesive material and man-hours will increase.

(Example-5) The above-mentioned 25 m / m thick fireproof coating material of the present invention was prepared by spot-adhering the adhesive material of the present invention to H-350 x 250 x 9 x 14 on the ground in advance.
Wrap around H steel and temporarily fix some parts with adhesive tape.
Although the pins were inserted and electrodeposited, it was extremely easy. The 2.5 m / m thick fireproof coating tape was adhered to the joint portion, and T pins were electrodeposited. The appearance was beautiful and no dust was generated on site.

(Embodiment 6) In the futon winding method, stainless steel strip was ground and fastened to the H steel of the previous Embodiment 5 as the base, and the mesh was welded and the studs were electrodeposited. It was able to be constructed.

Further, although the fire-resistant coating material tape of the present invention having a thickness of 2.5 m / m was wound as a base, it could be easily electrodeposited.

Both bases, coated with a fire-resistant adhesive of the present invention, the 25m / m
A thick refractory coating of the present invention was adhered, but easily adhered.

(Example-7) FIG. 5 to FIG. 8 show the construction procedure.

FIG. 6 shows that the fireproof coating material 1 is the steel frame 2 and the inorganic fireproof adhesive 3
It is an expanded sectional view bonded via. A stud pin 5 is also used to fix the fire-resistant adhesive material 1. Also, to prevent the initial peeling of the bonded part, it is also fixed to the lower end of the beam steel frame.
FIG. 7 is an enlarged cross-sectional view of the upper end of the steel frame of the beam in the portion that also fits the slab concrete. That is, the metal foil (stainless steel thickness 50 μ) is fixed to the metal plate (thickness 1 m
/ m) of the contact plate 6 is fixed by spot welding. 4 shows slab concrete.

FIG. 8 shows the structure of the fireproof coating material 1.

In the figure, 7 is a ceramic fiber type heat insulating material, 3 is an inorganic fire resistant adhesive, and 8 is a stainless steel foil having a thickness of 50 μm.

(Effect of the invention) As described above, a flexible sheet-like fireproof coating material obtained by laminating a metal foil and an inorganic fibrous heat insulating material with a fireproof adhesive material is used as the fireproof coating material, and according to the above coating method, The following effects can be obtained.

The inorganic fibrous heat insulating material and a metal foil, which is a stainless steel foil having a thickness of 50 μ, are laminated with an inorganic fire resistant adhesive.The fire resistant coating material has a multi-functionality superior to conventional ones as a fire resistant coating material for steel frames. .

The refractory coating does not require a special cutting tool,
Can be cut with a simple cutting tool such as a knife or scissors.

Since the above-mentioned fireproof coating material does not generate dust at the time of cutting and mounting, there is no possibility of damaging the health of the worker and the working environment is good.

The fireproof coating material has flexibility and flexibility,
Can be bent freely.

Therefore, it can be integrally fixed to any portion of the steel frame (flat portion, end portion, corner portion, curved surface portion, pipe periphery, etc.) without a gap.

Further, the surface metal foil can be used to bend and fix the corners.

The fire-resistant coating material is effective as a finishing material that also serves as a fire-resistant coating by utilizing the surface stainless steel surface, and it is possible to omit makeup work.

Further, since it is the stainless steel foil on the surface layer, it is clean without any dust and the like after coating.

Due to its excellent performance, the refractory coating material can be reduced in thickness to nearly half as compared with the conventional one. Therefore, the structural load is not small.

By using the above-mentioned fire-resistant coating material, it is easy to cut and install, and since the coating thickness is thin and lightweight, the workability of the fire-resistant coating construction can be greatly improved and improved compared to the case of the sheet-like fire-resistant coating material up to now. be able to.

Further, by cutting the factory, it is possible to reduce the loss of the incoming material and the residual material generated.

Since the fireproof coating material can be produced in the factory,
The quality and thickness can be controlled to be constant and stabilized.

The construction of the fire-resistant coating material is not limited to before the steel frame is erected, but can be performed at a steel frame production plant, and also after the steel frame is erected.

Further, it is not limited to the construction of steel frame beams, but can be applied to columns.

Further, the beams and columns of the steel frame are not limited to the above H steel, and can be applied to steel pipes, box steel frames, and other steel frames.

In the event of a fire, the surface metal foil has a shielding effect between the fire-resistant coating material and the high-temperature surrounding atmosphere, so it exhibits superior performance at high temperatures compared to conventional fire-resistant coating materials. Therefore, the required thickness of the fireproof coating material can be made thinner than that of the conventional one.

As a result, the workability during coating is greatly improved.

The metal foil (stainless steel thickness: 50μ) coated on the surface layer retains sufficient strength to support the heat insulating material even when applied and at high temperatures in the event of a fire, so there is less attachment of the fire resistant coating material to the steel frame. It can be fixed at points.

The stud can be welded as a fastening. The stud pins can be fixed by simply fixing a few points.

In the part that fits slab concrete, etc., the metal foil itself can be fixed by spot welding with a small piece of iron plate as the plate.

For this reason, the workability at the time of fastening work is significantly improved as compared with the conventional fireproof coating method.

Since the work is easy, no special skilled worker is required.

INDUSTRIAL APPLICABILITY The present invention enables, for the first time, a fire-resistant coating material that can be prefabricated into a steel frame and a method of manufacturing the same.

[Brief description of drawings]

Fig. 1 is a graph of differential thermal analysis in Table 2, Fig. 2 is a graph of the relationship between thermal conductivity and bulk specific gravity / temperature of ordinary refractory insulation.
FIG. 3 is a graph of heating time and furnace temperature, FIG. 4 is a graph of heating time and steel plate temperature, FIGS. 5 to 8 are construction procedure diagrams of the embodiment of the present invention, and FIG. Partial sectional view, FIG. 6 is an enlarged partial sectional view of the vertical portion of the steel frame in FIG. 5, FIG. 7 is an enlarged partial sectional view of a contact portion with slab concrete, and FIG.
The figure is a partially enlarged cross-sectional view of the fireproof coating material. 1 ... Fireproof coating material, 2 ... Steel frame, 3 ... Fireproof adhesive material, 4 ... Slab concrete

Continuation of the front page (56) References JP 62-72846 (JP, A) Actual opening 61-40230 (JP, U) Actual opening 60-191330 (JP, U) JP-B 63-14146 (JP) , B2)

Claims (4)

[Claims] 1. A composite characterized in that a surface material is a metal foil, and an inorganic fibrous heat insulating material is layered on the metal foil through a fire-resistant adhesive composed of an aqueous film-forming inorganic compound described in (a) below. Flexible sheet-like fireproof coating material. (A) A metal, a mineral acid compound that dissociates into water to form boric acid or hydrofluoric acid, and a nitrous acid compound and an alkali metal. H, BH ₃ , B ₂ O ₃ C ... Na, K, Li D ... H ₂ O, OH a, b, c, d, p, q, r, s ... Each number of moles 2. An inorganic fibrous heat insulation using a metal foil as a surface material, and a fire-resistant adhesive obtained by mixing the following (b) with a fire-resistant adhesive composed of an aqueous film-forming inorganic compound (a) described below. A composite flexible sheet-like fireproof coating material, which is obtained by layering materials. (A) A metal, a mineral acid compound that dissociates into water to form boric acid or hydrofluoric acid, and a nitrous acid compound and an alkali metal. H, BH ₃ , B ₂ O ₃ C… Na, K, LD… H ₂ O, OH a, b, c, d, p, q, r, s… each mole number (b) Natural or synthetic mineral Blends of one or more of powders, mineral fibers or layered compounds. 3. The fireproof coating material according to claim 1 or 2,
A fire-resistant coating method characterized in that the fire-resistant adhesive material according to claim 1 or 2 is bonded and fixed to all or part of the outer wall of the steel frame. 4. The fire-resistant coating material according to claim 1 or 2 is used on all or part of the outer wall of a structure before or after construction using the fire-resistant adhesive material according to claim 1 or 2. Fireproof coating method characterized by adhesive fixing.