JPH0655680A - Foamed fireproof sheet and execution method thereof - Google Patents

Abstract

PURPOSE:To form a foamed layer having a high expansion ratio and high strength, and to form a fireproofing having uniform thickness easily by shaping a foamed fireproof sheet of a combustible cloth-like article, which is impregnated with foamed fireproof paints and to which said paints are carried. CONSTITUTION:A foamed fireproof sheet is composed of a combustible cloth-like article, which is impregnated with foamed fireproof paints and to which said paints are carried. A method, in which the combustible cloth-like article is coated with the slurry-like foamed fireproof paints and pushed, a method, in which the combustible cloth-like article is dipped into liquefied foamed fireproof paints, etc., are cited as an impregnating method and a carrying method. The foamed fireproof sheet is proper to be bonded on the surfaces of various building structures, etc., to be used as fireproof construction. The thickness of a fireproofing layer 2 is ensured even regarding the corners and edge sections 3 of a steel frame, etc., by the shaping properties of the foamed fireproof sheet, in which foamed fireproof paints are brought to an undried state yet, when the foamed fireproof sheet is bonded on the surface of an object and dried as the execution method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foamed fire-resistant sheet and a method for constructing the same, and more particularly, to a foamed fire-resistant sheet for foaming and carbonizing to maintain the fire resistance of a substrate when the temperature rises due to a fire or the like. The present invention relates to a construction method suitable for a foam fireproof sheet.

[0002]

2. Description of the Related Art Conventionally, it has been stipulated by law that in building structures, main structures such as pillars, lees, floors and walls must be fireproof structures in order to protect the buildings from fire. ing. For example, for steel pillars and grits, a so-called wet method is often used, in which a slurry-like material kneaded with water is applied to the steel frame by spraying or ironing, and a fireproof coating layer is applied to form a fireproof structure. It is used.

As a coating material for use in such a wet method, an inorganic binder such as cement, an inorganic fibrous substance such as rock wool, asbestos and glass fiber, a lightweight aggregate such as perlite and vermiculite,
There is a wet refractory coating material in which an inorganic powder or the like containing water of crystallization is mixed and kneaded with water to form a paste or slurry material on the surface of a base material.

However, depending on the type of material, this wet fireproof coating requires a considerable coating thickness of about 20 to 40 mm in order to obtain sufficient fireproof performance for one hour. Therefore, when constructing such a coating material at a construction site, a large amount of coating material must be carried in, and the weight is large, which causes a problem of high transportation cost. In addition, since it is thickly projected from the base material and gives a feeling of pressure, it cannot be said that the appearance after construction is necessarily beautiful. In addition, there are many cases where an accident such as peeling or dropping occurs after the construction.

On the other hand, when the base material is applied by spraying, ironing, brushing, or roller coating, the coating film foams when the temperature rises due to fire or the like,
There are foam fire resistant coatings that impart fire resistance to the substrate. This is because the paint composition contains a foaming component that decomposes when the temperature rises to generate a non-combustible gas, and a carbonizing component that carbonizes to form a porous carbonized layer. In addition to exhibiting a fire extinguishing effect, it also exhibits a heat insulating effect by forming a porous carbonized layer.

Since this foamed fire-resistant paint foams several times to several tens of times to form a heat insulating layer, the original coating film is usually applied in a thickness of about several mm or less before use. Therefore, it can be made extremely thin compared to the wet refractory coating material,
There is little feeling of pressure and the finish is refreshing. Further, compared with the wet refractory coating material, less material is used, and there are few problems in transportation. Furthermore, since the surface can be easily color-painted, it is highly cosmetic. Therefore, the foamed fire-resistant paint is suitable for a site where fire resistance is required in a building and a cosmetic property is required for the appearance such as a steel frame.

However, the foamed refractory paint having various advantages as described above also has various problems.

First, in many cases brushes, rollers,
Although it is applied by spraying or the like, in this case, it is difficult to always ensure a uniform thickness over the entire area of the coating film.
In particular, since foamed fire-resistant paint is used after forming a thin coating film of about several mm, some non-uniformity is greatly increased during the foaming process, which adversely affects fire resistance performance. For example, if the foam thickness is non-uniform, protrusions are partially formed, sagging occurs, and in a remarkable case, the foam layer peels off from the surface of the base material, resulting in deterioration of fire resistance performance.

Secondly, it is desired that the expansion ratio is larger and the coating film after foaming is tough, and it is desirable in view of fire resistance to increase the expansion ratio. However, in the conventional fire-resistant paint, when the expansion ratio becomes large, the strength of the foam layer itself becomes weak, and it may be scattered due to the wind pressure generated at the time of fire.

Thirdly, the bubbles in the foamed layer were non-uniform, and in some cases large voids were formed or they appeared as protrusions on the surface.

Fourthly, there was a tendency that the foam layer itself was liable to sag during the foaming process. That is, when drooping in the foaming process, the foamed layer may peel off in an extreme case.

Fifth, since the foamed refractory paint is applied by spraying or ironing, the work environment is contaminated, such as the scattering of paint mist during the construction work and the adhesion of the paint to the floor, and the clothes of workers. However, there is a problem of pollution to the environment, which is against the recent movement of environmental protection, and improvement has been demanded.

[0013]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a foam fire resistant coating material which uses a foam fire resistant coating material and which can form a foam layer having a high expansion ratio and a high strength. It is another object of the present invention to provide a foamed fireproof coating material capable of easily forming a fireproof coating having a uniform thickness. Also,
It is an object of the present invention to provide a foam fire-resistant coating material that can be stored for a long time and can be produced in a factory. Furthermore, it is to provide a construction method suitable for constructing such a foam fire-resistant coating material on a substrate.

[0014]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies in order to solve such problems, and as a result, impregnated or supported a conventional foamed fire-resistant paint on a flammable cloth,
When used as a sheet, it was found that the construction is easy, and that foaming occurs uniformly and the fire resistance is improved.
The present invention has been completed.

That is, the present invention resides in a foamed refractory sheet made of a flammable cloth-like material impregnated with or carrying a foamed refractory paint. Further, the present invention is a foamed fireproof sheet comprising an undried combustible cloth material impregnated with or carrying a foamed fireproof coating material, and a film for packing the undried combustible cloth material to keep the undried state. Further, there is provided a method for constructing a foamed fire-resistant sheet, which comprises adhering a flammable cloth-like material impregnated with or carrying a foamed fire-resistant paint to a substrate in an undried state.

The present invention will be described in detail below.

A foamed fireproof paint (sometimes called a foamable fireproof paint) is a paint in which a coating film swells to a thickness of several times to several tens of times when exposed to a high temperature. Generally, a binder, a foaming agent and carbon are used. The produced material is contained as an essential component and, if necessary, an inorganic powder or the like is contained. In the present invention, those conventionally used, for example, “Kazuo Okada and Kiyoshi Yasuda, Surface, Vol. 13 (No. 4), 231-240.
(1978) ", JP-A-52-96038, JP-A-53-96038 and the like can be used.

As the binder which is an essential component of the foamed fireproof coating, polysiloxane, alkali metal silicate,
Inorganic binder such as gypsum; synthetic resin emulsion, dispersion type organic binder such as latex; polyethylene,
Resin solution type organic binder containing thermoplastic resin such as polystyrene, polyvinyl chloride and polyvinyl acetate, or thermosetting resin such as epoxy resin, urethane resin, phenol resin, urea resin, melamine resin, alkyd resin and polyester resin Can be used.

As the foaming agent, a dicyandiamide type foaming agent, a melamine type foaming agent, a chlorinated paraffin type foaming agent, a phosphate type foaming agent or the like can be used. Among them, phosphate-based ammonium polyphosphate is excellent. Ammonium polyphosphate is an ammonium salt of pyrophosphoric acid, triphosphoric acid, trimetaphosphoric acid, tetrametaphosphoric acid, or the like, which is a condensate of orthophosphoric acid, and is decomposed by heat of about 300 ° C. or higher to generate nonflammable ammonia gas. The extinguishing effect of the fire is exhibited by the desorption of water.

As the carbon-generating material, polyhydric alcohol,
Compounds containing no elements other than carbon, oxygen and hydrogen, such as polysaccharides and heat-expandable graphite, can be used. Among them, polyhydric alcohols are preferable, and pentaerythritol is particularly excellent. Pentaerythritol has a property of being carbonized by heat, and forms a porous carbonized layer containing bubbles therein during foaming of the foaming agent.

As the inorganic powder, silicates, carbonates, aluminum oxides, clays, clays, shirasu, mica, titanium dioxide and the like can be used if necessary.

As the inorganic fibers, asbestos, rock wool, glass fibers, silica-alumina fibers, silicon carbide fibers and the like can be used as required.

The composition ratio of each component of the foamed fire-resistant paint can be appropriately selected with reference to the known composition of the foamable fire-resistant paint. Although a specific preferable range varies depending on the kind of binder, for example, when a resin solution type binder containing an alkyd resin is used, the compounding amount of the binder converted into the solid content of the resin is 100 parts by weight. Then, the blending amount of the foaming agent such as ammonium polyphosphate is 100 to 600 parts by weight, the blending amount of the carbon generating material such as pentaerythritol is 25 to 300 parts by weight, the blending amount of melamine is 25 to 300 parts by weight, and the blending amount of the inorganic powder. Is 2
5 to 200 parts by weight, and the blending amount of the inorganic fiber is preferably selected from the range of 1 to 5 parts by weight.

The flammable cloth material is an organic combustible material having continuous pores. Specifically, natural rubber, neoprene,
NBR (acrylonitrile butadiene rubber), SB
Rubber sponge made of R (styrene-butadiene rubber), etc .; plastic foam made of polystyrene, polyvinyl chloride, polyethylene, polypropylene, etc .; natural polymer porous body such as wood-based porous body, straw, sprue, sponge, etc. A knitted fabric, a felt, a non-woven fabric formed of various fibers; a fiber aggregate formed of wood wool and the like. Among them, nylon,
Nonwoven fabrics made of polypropylene, polyamide, vinylon, rayon, polyethylene terephthalate, etc. are suitable.

The foamed refractory sheet of the present invention is obtained by impregnating or carrying a foamed refractory paint on a flammable cloth. As the impregnation method and the supporting method, for example, a method of applying a slurry foamed fireproof paint to a flammable cloth-like material and then pressing it, a method of immersing the flammable cloth-like material in a liquid foamed fireproof paint, and the like are adopted. You can A suitable range of the impregnated amount or supported amount of the foamed refractory paint depends on the required fire resistance performance or the thickness of the cloth-like material, but is generally 0.1 to 10 kg with respect to the area of the cloth-like material. / m ² approximately, the practical 0.2~5k
g / m ² , particularly preferably 0.5 to 3 kg / m ² .
In consideration of practicality during transportation and construction, a foamed fire-resistant sheet having a thickness of about 0.5 to 3.0 mm is excellent, and a foamed fire-resistant coating material having a thickness as a foamed fire-resistant sheet is about this level. Is preferably impregnated or supported.

The foamed refractory sheet of the present invention is suitable for being used by adhering it to the surface of an object to be made into a refractory structure, for example, the surface of various building structures. As its construction method, the foamed fireproof paint impregnated or carried on the flammable cloth is still in an undried state. The method of allowing is preferable.

Since the foamed refractory sheet of the present invention has shapeability, the corners (edges,
The thickness can be reliably ensured. For reference, Figure 1
As a result, a cross-sectional view of the foamed fire-resistant sheet of the present invention bonded to an H-shaped steel (1) to form a fire-resistant coating layer (2) is shown.
Further, FIG. 2 shows a cross-sectional view when a conventional foamed fire-resistant coating material is applied to the H-shaped steel (1) by a spray method to form a fire-resistant coating layer (2). It can be seen from FIG. 1 that according to the present invention, the thickness of the fireproof coating layer (2) is ensured even in the edge portion (3). On the other hand, it can be seen from FIG. 2 that the conventional foamed fire-resistant paint can hardly secure the thickness of the fire-resistant coating layer (2) at the edge portion (3).

Since it is not practical to manufacture the foamed refractory sheet of the present invention at a construction site, it is advantageous to manufacture it at a factory and convey it to the construction site for use. It is difficult to keep the foamed refractory paint impregnated or supported on the object in an undried state. Therefore, in the present invention,
The foam refractory paint is kept undried by packing the foam refractory sheet with a film. Then, at the time of construction, this film is peeled off and used.

Specific methods for packing the foamed fireproof sheet include a method of covering the surface and / or the back surface of a flammable cloth-like material impregnated with or carrying a foamed fireproof paint with a non-breathable film. , A single flammable cloth material impregnated with or carrying a foamed fireproof coating, or a plurality of flammable cloth-like materials,
A method of storing in a bag or container made of a non-breathable material may be mentioned.

As the non-breathable film used in the former, a film made of a resin such as phenol resin, urea resin, melamine resin, polyester resin, vinyl chloride resin, styrene resin, polyethylene, polyamide, polycarbonate, polypropylene; aluminum foil And the like; laminated metal thin films; paper and the like. In this case, the following method can be adopted as a method for producing the foamed refractory sheet. That is, the flammable cloth-like material is placed so as to be overlaid on the non-breathable film, the surface thereof is coated with the foamed fire-resistant paint, and the film is further laminated,
A method of sealing the ends of the films on both sides with a heat seal, an adhesive or an adhesive can be adopted. When a non-adhesive surface-treated film is used as the non-breathable film, there is an advantage that the film is easily peeled off during construction.

Also in the latter case, it is preferable to employ a method in which the front surface and / or the back surface of each foamed refractory sheet is covered with a film and peeled off during use. The film used in this case may be non-breathable or breathable.

[0032]

At present, the detailed reaction mechanism of the foamed refractory sheet of the present invention has not been elucidated. However,
According to the knowledge of the present inventors, the combustion of the flammable cloth interacts with the foaming / carbonizing mechanism of the foamed fire-resistant coating material to balance the strength and the expansion ratio of the formed porous carbonized layer. It is thought to have been done. As a result, it is considered that the expansion ratio can be improved, the sagging associated therewith can be prevented, and the formation of protrusions due to uneven foaming can be prevented.

[0033]

According to the present invention. Due to the action of the flammable cloth-like material, the expansion ratio of the foamed fire-resistant paint is improved, and the strength of the formed porous carbonized layer is also improved, so that the porous carbonized layer sags and the formation of protrusions due to uneven foaming is prevented. It can be prevented.

Further, the thickness of the fireproof coating layer can be adjusted in advance by impregnating or carrying the foamed fireproof coating on a flammable cloth having a constant thickness.

Further, according to the foamed fire-resistant sheet of the present invention, in the conventional method of applying the foamed fire-resistant paint by roller or iron coating, it is difficult to secure the thickness of the fire-resistant coating layer, such as a corner (edge) of a steel frame or the like. Section)
The thickness can be reliably ensured (see FIGS. 1 and 2).

According to the construction method of the present invention, since the fireproof coating layer can be formed on the substrate only by adhering the undried foam fireproof sheet, there is a problem in the conventional method of spraying the foam fireproof paint or the like. There are no problems such as mist scattering, and it does not pollute the work environment. Further, even a non-expert can form a fireproof coating layer having a uniform thickness, and the reliability of fireproof performance is significantly improved.

[0037]

【Example】

[Preparation of Foamed Fireproof Paint and Production of Foamed Fireproof Sheet] Example 1 100 parts by weight of one-pack modified epoxy resin solvent-based binder,
Ammonium polyphosphate 112.7 parts by weight, pentaerythritol 26.0 parts by weight, melamine powder 34.7 parts by weight, titanium dioxide powder 53.3 parts by weight and diluent 66.
7 parts by weight were compounded.

Next, a film made of polyethylene (30
0x300mm), 200x in the middle of the upper surface
About 60 g of the foamed refractory paint prepared as described above was applied over a range of 200 mm. Immediately after that, 20
A non-woven fabric having a PET (polyethylene terephthalate resin) / acrylic resin fiber having a thickness of 1 mm cut into 0 × 200 mm as a core material was placed thereon. Furthermore, about 1 from above
After applying 00 g of the fire-resistant paint, a polyethylene film was further placed thereon and gently pressed by a plate to impregnate the non-woven fabric with the paint. At this time, the thickness of the film was measured and found to be 1.3 mm. Then, the edges of this film were heat-sealed to obtain a packed foamed fire-resistant sheet.

Example 2 As a binder for a foamed fire-resistant paint, the same amount of a normally dried alkyd resin solvent-based binder was used in place of the one-component modified epoxy resin solvent-based binder, and PET (polyethylene terephthalate resin) / acrylic resin was used. Instead of the non-woven fabric having the fiber as the core material, the non-woven fabric having the polypropylene fiber as the core material is used, and the PVC is used instead of the polyethylene film.
A foamed refractory sheet was manufactured in the same manner as in Example 1 except that a (polyvinyl chloride resin) film was used.

Example 3 A foamed fire-resistant sheet was produced in the same manner as in Example 1 except that the same amount of dicyandiamide was used as a component of the foamed fire-resistant paint instead of the melamine powder.

Example 4 A foamed fire-resistant sheet was produced in the same manner as in Example 2 except that the same amount of dicyandiamide was used as a component of the foamed fire-resistant paint instead of the melamine powder.

Example 5 Foaming fireproofing was carried out in the same manner as in Example 1 except that the same amount of the normally dry alkyd resin solvent type binder was used as the binder of the foaming fireproofing paint, instead of the one-pack modified epoxy resin solvent type binder. The sheet was manufactured.

Example 6 A foamed fireproof sheet was prepared in the same manner as in Example 2 except that the same amount of the normally dry alkyd resin water-based binder was used as the binder of the foamed fireproof paint instead of the normally dry alkyd resin solvent binder. Was manufactured.

[Formation of Fireproof Coating (Construction of Foamed Fireproof Sheet)] Examples 1 to 6 The ends of the film of the foamed fireproof sheet produced as described above are cut off, the film on one side is peeled off, and a foamed fireproof paint is formed. The exposed surface of the non-woven fabric impregnated with
After sticking to a 300 × 9 mm hot rolled steel plate, the film on the opposite surface was peeled off and the foamed fireproof paint was dried. As a result, a fireproof coating (fireproof coating) having a uniform thickness could be formed.

Comparative Example 1 The foamed refractory paint used in Example 1 was 300 × 300 × 9.
mm hot rolled steel sheet was applied by spraying to form a fire resistant coating.

Comparative Example 2 The foamed refractory paint used in Example 2 was 300 × 300 × 9.
mm hot rolled steel sheet was applied by spraying to form a fire resistant coating.

Comparative Example 3 The foamed refractory paint used in Example 1 was 300 × 300 × 9.
A hot-rolled steel sheet of mm was applied by trowel coating to form a fireproof coating.

[Evaluation] Examples 1 to 6 and Comparative Examples 1 to 3 The hot-rolled steel sheet on which the fireproof coating was formed as described above was used as a test piece, and standard heating specified in JIS-A-1304 was performed in an electric furnace. After heating / heating the temperature for 40 minutes based on the curve, observing the formed carbonized foam layer, the expansion ratio,
The size of bubbles (uniformity of bubbles), the sagging of the foamed carbonized layer (deviation of the foamed carbonized layer), the surface projections, the presence or absence of cavities (generation at the interface with the substrate) were evaluated. The workability during construction was also evaluated. The results are shown in Table 1. Table 2 shows the evaluation criteria for each item.

[0049]

[Table 1]

[0050]

[Table 2]

[Brief description of drawings]

FIG. 1 is a view showing a foamed refractory sheet of the present invention having H adhered to its surface
It is a sectional view of type steel. The black portion in the figure is the foam fireproof sheet layer.

FIG. 2 is a cross-sectional view of an H-shaped steel in which a conventional foamed refractory paint is applied to the surface by a spray method. The black portion in the figure is the foamed fireproof coating layer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Tomio Ouchi, 192-1 Tobita, Tofu, Chofu, Tokyo Metropolitan Research Institute, Kashima Construction Co., Ltd. (72) Keiichi Miyamoto, 2-19-1, Tobita, Chofu, Tokyo Kashima Construction Co., Ltd. Technical Research Center

Claims (3)

[Claims] 1. A foamed fire-resistant sheet made of a flammable cloth material impregnated with or carrying a foamed fire-resistant paint. 2. A foamed fire-resistant sheet comprising an undried combustible cloth-like material impregnated with or carrying a foamed fire-resistant paint, and a film for packing the cloth-like combustible cloth to hold the undried state. 3. A method for constructing a foamed fire-resistant sheet, which comprises adhering a flammable cloth-like material impregnated with or carrying a foamed fire-resistant paint to a substrate in an undried state.