JPH0770428A - Foam-type fireproof molded article and foam-type fireproof composition - Google Patents

Abstract

(57) [Abstract] [Purpose] Compared with conventional products, it has better water resistance and can maintain high fire protection performance for a long period of time, and when a fire occurs, resin softened by heating and liquefied may flow out. (EN) Provided are a foam-type fireproof molded product in which a carbide does not fall off, and a foam-type fireproof composition for obtaining the molded product. [Composition] The foamable fire protection composition comprises a first polyol-containing composition.
A polyurethane resin composition comprising a liquid and a second liquid containing a polyisocyanate, heat-expandable graphite, and microcapsules formed by coating ammonium polyphosphate powder with a resin are essential components, and are foamable fireproof. The molded product is a molded product of this composition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when inserted into joints, gaps, holes, etc. of the inner and outer walls of a general structure and exposed to a flame, forms a strong foamed carbonized film to prevent the use of wood or the like. It has the effect of protecting flammable materials from fire and preventing outflow of smoke, flames, and gases generated by combustion to the outside. It relates to a foam-type fireproof composition for obtaining.

[0002]

2. Description of the Related Art An opening for a pipe or the like inside a general building is closed with a mortar or a sealing agent after the pipe is laid. In addition, an inorganic material such as mortar, gypsum, and water glass is used for the purpose of fire resistance and sound insulation for the seal of the joint portion of the fire resistant member used for interior panels and partitions.

These inorganic materials and sealing agents are
Widely used because it is convenient. However, the shrinkage of the inorganic material is unavoidable in the course of hardening, and the condition after hardening is very hard. Due to breakage or the like, a gap is likely to be formed, and the original function is not necessarily exhibited. In high-rise buildings that emphasize inter-layer displacement and conformability, since the joints are designed to move to absorb the displacement, the hardened body of the inorganic material cannot be used, and a complicated structure must be taken. And the fireproof sound insulation is secured.

Most of the sealing agents are flammable, and the combustion residue has almost no effect on the fire protection of the openings. Therefore, for example, in the movable joint of the exterior wall panel, a foamed asbestos body cut according to the joint width (for example, product name "Litoflex" manufactured by Nichias Co., Ltd.) is compressed and inserted at the bottom of the joint, and Therefore, a sealing finish is given to impart waterproofness and the like to impart fireproofness to the movable joint portion.

However, since the foamed asbestos body is not deformed by heating at all, when the foamed asbestos body is cut into the joint width and inserted into the joint portion, the exterior wall panel is dehydrated and contracted by the heating to cause the joint portion to be broken. When opened 2-3 times, there is a gap and it is difficult to completely stop the flame from entering. In order to prevent the formation of such a gap, it has been proposed to inject a wet foam type fireproof paint into the movable joint of the exterior wall panel, and then to inject a sealing agent to impart waterproofness and airtightness. .

[0006] However, although the above-mentioned wet foaming type fire-preventing paint has high fire-preventing performance, it has a problem in its own water resistance. Also,
There is a problem that it is difficult to inject the paint to a predetermined thickness. For example, when the wet foaming type fire-preventive paint is being injected into the joint portion while being discharged from the nozzle, the nozzle is caught and does not move smoothly, so that the injection amount is not uniform. If the thickness of the fireproof coating is not constant, the thickness of the sealing agent injected on the fireproof coating becomes uneven, resulting in poor watertightness or waterproofness.

The following components (i), (ii), (iii) and (iv) are used to solve the drawbacks of this wet foaming type fireproof paint.
There is known a foam-type fireproof molded article obtained by molding a foam-type fireproof composition containing as an essential component (JP-A-3-149).
283). (i) A polyurethane resin composition comprising a first liquid containing a polyol and a second liquid containing a polyisocyanate.

(Ii) Ammonium polyphosphate. (iii) Polyhydric alcohol. (iv) Amino group-containing compound. The foamable fire protection composition can be molded into a predetermined shape depending on the location of construction. Therefore, when a foam-type fireproof molded article obtained by molding this composition is used, the construction is easier and a uniform thickness is easier than when the wet foam-type fireproof paint is used. The foam-type fireproof molded article is expanded by heating when a fire occurs (for example,
10 times or more), foams to form a carbonized layer, and this carbonized layer shields the flammable underground material from flame and heat,
It can prevent flammable underground materials from burning. Also, even if a gap is created due to cracking, shrinkage, vibration, etc. of the interior and exterior materials, unlike the case of the foamed asbestos body, it expands and foams by heating to close the gap, so smoke, flame, gas, etc. from the gap. Intrusion or outflow can be prevented.

[0009]

However, the above-mentioned conventional foam-type fireproof molded article has the following drawbacks. Since the water resistance of ammonium polyphosphate, which is one of the essential components of the foamable fire protection composition as the raw material, is not sufficient, the fire protection performance of the molded product may be reduced in a short period of time. Further, when a fire occurs, the polyurethane resin in the molded product is softened and liquefied due to heating and flows out from the joints, or the carbides fall off. Therefore, when it is used alone in a general opening or joint or when it is used in combination with a regular watertight material, the fire resistance becomes insufficient as compared with the case where it is used in combination with a sealing agent.

Therefore, the present invention has better water resistance than the above-mentioned conventional products and can maintain high fireproof performance for a long period of time, and when a fire occurs, the polyurethane resin softened and liquefied by heating flows out. It is an object of the present invention to provide a foam-type fireproof molded article that does not squeeze or drop carbides, and a foam-type fireproof composition for obtaining this molded article.

[0011]

In order to solve the above problems, the inventors have made various studies. As a result, if the powder of ammonium polyphosphate is coated with a resin and microencapsulated, the water resistance of the molded product is improved, the fireproof performance is maintained for a long time, and thermal expansion graphite is used as an essential component. For example, this heat-expandable graphite expands by heating, and the expanded graphite layer exhibits high fire resistance, and it is confirmed by experiments that the softened and liquefied polyurethane resin flowing out and the falling of carbides are prevented by heating. do it,
Completed this invention.

Therefore, the foamable fireproofing composition according to the present invention contains the following components (A), (B) and (C) as essential components. (A) A polyurethane resin composition comprising a first liquid containing a polyol and a second liquid containing a polyisocyanate. (B) Thermally expandable graphite.

(C) Microcapsules obtained by coating ammonium polyphosphate powder with a resin. The foamable fireproof molded article according to the present invention is obtained by molding the foamable fireproof composition according to the present invention. The component (A) used in the present invention is a polyurethane resin composition comprising a first liquid containing a polyol and a second liquid containing a polyisocyanate. Since this polyurethane resin composition is a two-component type, it is often a room temperature curing type. The use of the room temperature curable polyurethane resin composition has an advantage that molding at a low temperature (for example, 110 ° C. or lower) can be performed. However, the polyurethane resin composition used in the present invention is not limited to the room temperature curing type.

The polyol contained in the first liquid can be used by arbitrarily selecting one or more from those conventionally used as the polyol component of the room temperature curable two-component polyurethane resin composition. . Such polyols are not particularly limited, but include, for example, polyester polyols derived from organic dicarboxylic acids and polyhydric alcohols, polyester polyols derived from lactones, castor oil, castor oil modified polyols, polyether polyols, epoxies. Modified polyol, silicone-based polyol, polyether polyester polyol having both the polyester unit and the polyether unit, and (meth) derived from (meth) acrylic acid.
Among acrylic polyols, the molecular weight is 300 to 3000,
Examples thereof include those having a hydroxyl value of 50 to 350.
These polyols may be used alone or in combination of two or more. The organic dicarboxylic acid is not particularly limited, but for example, phthalic acid, adipic acid, dimerized linoleic acid, maleic acid, etc. are used. The polyhydric alcohol is not particularly limited, but for example, ethylene glycol, propylene glycol, butylene glycol, diethylene glycol, trimethylolpropane, hexanetriol, glycerin, trimethylolethane, pentaerythritol and the like are used. The polyester polyol derived from lactone is not particularly limited, but examples thereof include polybutyrolactone and polyvalerolactone. The polyether polyol is not particularly limited, and examples thereof include poly (oxypropylene) glycol and poly (oxypropylene) poly (oxyethylene).
Glycol, poly (oxybutylene) glycol, poly (oxytetramethylene) glycol, poly (oxypropylene) triol, poly (oxypropylene) poly (oxyethylene) triol, poly (oxypropylene) poly (oxyethylene) poly (oxypropylene) )
Triol etc. are mentioned.

In the first liquid, it is possible to use the polyol and various crosslinking agents in combination to increase the reaction rate or increase the mechanical strength of the molded product. The cross-linking agent that can be used is not particularly limited, but for example, aliphatic diols such as ethylene glycol, propylene glycol, butylene glycol, pentanediol, diethylene glycol, dipropylene glycol; ethylenediamine, propylenediamine, butylenediamine, Aliphatic diamines such as pentamethylenediamine; aniline, phenylenediamine, 4,4'-
Aromatic amines such as methylenedianiline, 2,2-bis (p-aminophenyl) propane, 3,3'-dichloro-4,4'-diaminodiphenylmethane, 1,2-bis (2-aminophenylthio) ethane And the like.

The polyisocyanate contained in the second liquid may be any polyisocyanate used in ordinary polyurethane resin compositions and is not particularly limited. For example, hexamethylene diisocyanate and octamethylene diisocyanate. , Tolylene diisocyanate (also called TDI), 1,5-naphthalene diisocyanate, diphenylmethane-4,4'-diisocyanate, biphenyl-4,4'-diisocyanate, 2,2'-diphenylpropylene-p, p'-diisocyanate, etc. Is mentioned.

The mixing ratio of the first liquid and the second liquid is not particularly limited, and normally, the polyol (for example, polyester polyol, polyether polyol) and the cross-linking agent (for example, amine component) in the first liquid. And / or diol component) and the total number of moles of active hydrogen and the number of moles of isocyanate groups of the polyisocyanate (for example, diisocyanate component) in the second liquid are substantially equal to each other. One of them can be used in excess.

The component (B) used in the present invention is thermally expandable graphite. This thermally expandable graphite is a graphite having a property that when heated, the compound existing between the graphite layers is thermally decomposed and the whole expands. The compound existing between the layers of the graphite and thermally decomposed is not particularly limited, but examples thereof include graphite acid sulfate, sodium graphite, potassium graphite, halogenated graphite, graphite oxide, aluminum chloride graphite, and chloride. Examples include ferric graphite. As the heat-expandable graphite, known one can be used.

The amount of the heat-expandable graphite used is not particularly limited, but is usually 10 to 100 parts by weight per 100 parts by weight of the polyurethane resin composition as the component (A). If the amount is less than this, the fire resistance becomes insufficient, and if the amount is more than this, peeling during heating does not serve the role of fire prevention, and the mechanical strength of the molded product becomes low, which is not preferable. Because.

The component (C) used in the present invention is a microcapsule in which ammonium polyphosphate powder is completely or almost completely coated with a resin. The method for microencapsulating ammonium polyphosphate is not particularly limited, and examples thereof include interfacial polymerization method, in situ polymerization method, liquid curing method, phase separation method, liquid drying method, and melt dispersion. Known methods such as a cooling method, a spray drying method, and a powder bed method can be adopted. The resin that can be used for microencapsulation is not particularly limited, but those that form a film having excellent water resistance that is difficult for water to permeate are preferable, and examples thereof include vinyl chloride resin, vinylidene chloride resin, epoxy resin, urethane resin, Examples thereof include acrylic resin, phenol resin, vinyl acetate resin, cellulose resin, alkyd resin, shellac resin, diallyl phthalate resin, polyamide resin, melamine resin and urea resin. These may be used alone or in combination of two or more. Among the above resins, the melamine formaldehyde resin is preferably used from the viewpoints of more complete resin coating, water resistance of the resin, strength of the capsule, and finer encapsulation.

The particle size of ammonium polyphosphate microcapsules is not particularly limited, but is 100
It is preferably μm or less. If the proportion of particles having a particle size of more than 100 μm increases, hard sedimentation occurs in the foam-type fire-preventive composition, which makes it difficult to produce foam-type fire-resistant molded articles, or makes uniform dehydration / carbonization difficult. In order to
This is because it is not preferable.

Ammonium polyphosphate has a phosphorus content of 3
Those having a content of 1.5 ± 0.5% by weight, a nitrogen content of 14.5 ± 0.5% by weight, and a decomposition temperature of 275 ° C. or higher are suitable. Such ammonium polyphosphate is not particularly limited, but examples thereof include ammonium polyphosphate manufactured by Sumitomo Chemical Co., Ltd. (trade name "Sumisafe P") and the like.

The compounding amount of the ammonium polyphosphate microcapsules as the component (C) is not particularly limited, but the polyurethane resin composition 1 as the component (A).
It is preferably 20 to 150 parts by weight with respect to 00 parts by weight. If the blending amount of the component (C) is less than this range, it becomes difficult to effectively carbonize the whole organic substance, or sufficient foaming cannot be expected, so that the blending amount of the component (C) falls within the above range. If it exceeds, the viscosity of the foamable fireproofing composition becomes high due to the addition of the heat-expandable graphite and the like, and it becomes difficult to produce a foamable fireproofing molded article, or the expansion ratio decreases, which is not preferable. Because.

The components (B) and (C) are both
It is often mixed and dispersed in the first liquid of the component (A) polyurethane resin composition, and therefore the amount of the component added is naturally limited. However, the mixing of components (A)-(C) is not limited to this method. The foamable fireproof composition of the present invention includes the essential components (A) to (C) described above.
In addition, if necessary, one or more auxiliary components commonly used in ordinary two-component room temperature curing type polyurethane resin compositions can be contained. Such auxiliary components (optional components) are not particularly limited, but include, for example, extender pigments such as silica, talc, barium sulfate; aluminum hydroxide, magnesium hydroxide, kaolin, calcium hydrogen phosphate, hectorite, and sulfurous acid. Sodium heptahydrate, ettringite, alunite, alunite, hydrotalcite (blues stone), diaspore, gypsum stone (hydrargillite), kaolinite, montmorillonite, serpentine, slaked lime, gypsum, zinc phosphate, etc. , Inorganic fillers that generate water vapor when heated; iron oxide yellow, light yellow 50, iron oxide brown, iron oxide red, light blue 100, chrome oxide green GN and other color pigments; organotin compounds, organolead compounds and other catalysts ; Dioctyl phthalate (DO
P) and other organic plasticizers; various phosphorus plasticizers such as triphenyl phosphate, tricresyl phosphate, tris (chloroethyl) phosphate, cresyl diphenyl phosphate; and dehydrating agents. These auxiliary components are used, for example, by being contained in the first liquid of the polyurethane resin composition of component (A), but are not limited thereto.

The foamable fireproofing composition of the present invention is not particularly limited, but is mixed into a desired shape, for example, after being mixed by a stirrer with a blade. The molding method and conditions are not particularly limited, but for example, it may be poured into a container having a predetermined width, thickness and length to be molded into a sheet or film, or may be molded into a predetermined shape. It may be injected into a mold for molding, or may be extruded and cast using a die designed to have a predetermined width and thickness. By these molding methods, it is possible to obtain a foam-type fireproof molded product having a uniform shape.

When the foamed fireproof molded article of the present invention is obtained in the form of a sheet or film, it may be cut into a predetermined width, or a cut may be made so that it can be easily cut into a predetermined width. You can leave it. When it is obtained in tape or bar shape, it may be cut into a predetermined length,
Alternatively, a cut may be made so that it can be easily cut at a predetermined length.

The foamed fire-resistant molded article of the present invention can be used, for example, in joints as it is or with a predetermined width and / or width.
Or cut into length and inserted. Compared to the case of injecting wet fireproof paint, it can be easily inserted,
Moreover, the thickness can be made more uniform. Here, the predetermined width and / or length means, for example, a width and / or a length matching the shape of the movable joint portion and the opening, and the width and / or the length of the portion into which the foam-type fireproof molded article is to be inserted.
Or is the length.

The location of application of the foamed fireproof molded article of the present invention is not particularly limited as long as it is a joint or the like that requires fireproofness. For example, the outer wall, ceiling or roof of a general house. It can be applied to joints such as exterior surfaces of various buildings such as floors and floors. Alternatively, it may be an opening other than the joint. The foamable fire-preventing composition of the present invention has a composition suitable for each of the molding locations of the molded articles, and may be used in combination with various materials as required. For example, in the case where the joint to be applied is required to have other properties such as waterproofness and weather resistance together with fireproofness, but the foamed fireproof molded article is not sufficiently imparted with the other properties, etc., It is effective to form a waterproof layer on this molded product. The material for forming the waterproof layer is not particularly limited, but for example, a commonly used sealing agent (for example, a silicone-based sealing agent, a modified silicone-based sealing agent, etc.), a fixed water-tight material (for example, ethylene propylene dimethyl, etc. Made of rubber (also referred to as EPDM rubber)] and the like. It is more preferable to use a material having flame retardancy.

[0029]

In the present invention, the foaming type fire protection composition is constituted by using the above-mentioned components (A), (B) and (C) as essential components,
A foamed fireproof molded article is obtained by molding this composition. The use of the two-component polyurethane resin composition as the component (A) accelerates the curing reaction of the foamable fireproofing composition and reduces the shrinkage of the volume due to the curing so that the foamable fireproofing composition has a uniform shape. Make it easier to mold. Therefore, compared with the above-mentioned wet foam type fire-preventive paint, construction becomes easier,
Moreover, it is easy to obtain a uniform thickness.

The heat-expandable graphite, which is the component (B), expands in volume by about 100 times when heated. The thermally expanded graphite layer prevents the flammable underground material from burning by insulating the flammable underground material from the flame and heat.
Even if there is a gap due to cracking, contraction, vibration of interior and exterior materials, etc., unlike the case of the foamed asbestos body, the thermally expandable graphite expands by heating and closes the gap, so smoke, flame, Prevent gas from entering or spilling. Also.
The thermally expanded graphite layer absorbs the polyurethane resin liquefied and liquefied by heating between the layers and integrates it with the resin to prevent the polyurethane resin from flowing out and prevent the carbonized layer from falling off. Therefore, the foam-type fireproof molded article of the present invention has an improved fireproofing property as compared with the conventional foamable fire-proof molded article described above, and is used as a regular watertight material or alone in a general opening or joint. High fire resistance is exhibited even when used together.

The component (C), ammonium polyphosphate, acts as a dehydration catalyst. That is, in a heating environment, organic substances are dehydrated and carbonized to form a fireproof carbonized layer, and at the same time, a fireproof inorganic phosphate film is formed by itself. Further, it also functions as a foaming agent that decomposes by heating to generate ammonia gas and expands organic substances. However, in the present invention, the ammonium polyphosphate is used in the state where the powder is completely or almost completely covered with the resin and is microencapsulated. Then, for example, the dissolution rate of ammonium polyphosphate in water at 20 ° C. is at most 0.3% by weight or less, and usually 0.1% by weight or less, so that sufficient water resistance as a molded article is ensured. , High fire performance is maintained for a long time.

[0032]

EXAMPLES Specific examples and comparative examples of the present invention will be shown below, but the present invention is not limited to the following examples.
In the following examples, "part" represents "part by weight". -Example 1-Polyether polyol [average molecular weight = 3000, OH
V (hydroxyl value) ≅56] 36.7 parts of thermally expandable graphite (manufactured by Nippon Kasei Co., Ltd., trade name “thermally expandable graphite CA-6
0 ") 14.7 parts and 30.8 parts of microencapsulated ammonium polyphosphate were added and mixed with stirring. Here, as the microencapsulated ammonium polyphosphate, ammonium polyphosphate having the same composition as ammonium polyphosphate manufactured by Sumitomo Chemical Co., Ltd. (trade name "Sumisafe P") is coated with a melamine formaldehyde resin by a liquid curing method. Was obtained by
The particle diameter was 0.1 to 100 μm, and the solubility in water at 20 ° C. was 0.3% by weight or less.

Further, an organic lead catalyst (lead octylate) 2.
0 part was added and stirred for 5 minutes. Then, as a second liquid, a TDI-based prepolymer [polyether polyol and TD
Urethane prepolymer with I (tolylene diisocyanate), average molecular weight 1500, NCO% ≈2.9%] 6
By adding 3.3 parts and stirring and mixing for 2 minutes, a foamable fireproofing composition was obtained.

This composition was poured into a polyethylene container of 5 mm × 100 mm × 150 mm, left for 1 day, taken out, and cut into 5 mm × 10 mm × 140 mm to obtain a foam type fireproof molded article. -Examples 2 to 6-By the same operation as in Example 1 except that the composition of the foamable fire protection composition was as shown in Table 1 in Example 1.
By preparing the foamable fireproof composition and molding this composition, a foamable fireproof molded article having the same shape and size as in Example 1 was obtained.

[0035]

[Table 1]

-Comparative Example 1-Polyester polyol [average molecular weight = 900, OHV
(Hydroxyl value) = 160] 53.8 parts were heated to 110 ° C., 44.5 parts of ammonium polyphosphate, 18.7 parts of dipentaerythritol and 11.7 parts of melamine were added, and subsequently 110 ° C. and 0 to 5 mmHg. Stirring was performed for 3 to 5 hours under reduced pressure conditions to reduce the water content to 500 ppm or less. Then, 3,3'-dichloro-4,4'-diaminodiphenylmethane (manufactured by DuPont, trade name "MOCA") 1.
9 parts, 4,4'-methylenedianiline (abbreviated as "MD
A ") 0.3 part, dehydrating agent (synthetic zeolite) 3.0 part,
Organic tin catalyst [dibutyltin dilaurate (DBTD
L)] 0.02 part was added, and the stirring was continued for another 30 minutes under the same conditions, and then the stirring was stopped and the mixture was cooled.

To the first liquid thus obtained, 44.0 parts of MDI (4,4'-diphenylmethane diisocyanate) prepolymer as a second liquid was added, and the mixture was stirred and mixed for 2 minutes to give a foaming type. A fire protection composition was obtained. This composition is poured into a polyethylene container of 5 mm x 100 mm x 150 mm, left for 1 day, then taken out, 5 mm x 10 mm
A foam-type fireproof molded article was obtained by cutting into a 140 mm piece.

The foam type fireproof molded articles obtained in Examples 1 to 6 and Comparative Example 1 were subjected to the following fireproofness test and water resistance test. The results are shown in Table 2. Fire resistance test (1) Measurement of backside temperature As shown in Fig. 1, wood particle board (148
mm x 148 mm x 12 mm) 1 on top of fly ash slag cement-based (= NFC, non-asbestos) exterior material (65 mm x
140 mm x 12 mm) 2 pieces are lined up and stuck together, and the width is 10
The joint portion 3 of mm was prepared. The foamed fireproof molded article 4 was inserted into the joint portion 3 to obtain a test body. Thereafter, as shown in FIG. 2, a flame of 900 ° C. was applied to the joint 4 on the side where the molded product 4 was inserted, and the back surface temperature after 30 minutes was measured with a thermocouple.
In the figure, 5 is a gas burner, 6 is a thermocouple insertion hole, and 7 is a thermocouple.

(2) Measurement of expansion ratio A foam-type fireproof molded article is placed on a slate plate and heated at 900 ° C.
The state of foaming when foamed by applying the flame of No. 2 was confirmed, and the volume expansion multiple was evaluated. (3) Fall-off of carbonized layer It was observed when the backside temperature was measured. The case where the carbonized layer did not drop off was evaluated as ◯, the case where there was no dropout but some scattering was found as Δ, and the case where some dropout was found was evaluated as x.

(4) Outflow of Resin A foam type fireproof molded article was cut into 5 mm × 10 mm × 20 mm pieces, placed on a slate plate, and heated with a gas burner. that time,
○: No resin outflow, ×:
It was evaluated by. Water resistance test The foamed fireproof molded article was either i) immersed in tap water at 40 ° C for 1 month, or ii) naturally exposed for 3 months. The state when a flame of 900 ° C. was applied after each of the tests i) and ii) and without performing each of the tests i) and ii)
The state when the foaming performance did not change was evaluated as ◯, and the one in which the foaming performance decreased was evaluated as x, by comparing with the state when a flame of 0 ° C. was applied.

[0041]

[Table 2]

[0042]

EFFECT OF THE INVENTION The foaming type fireproof molded article according to the present invention is inserted into the joints, gaps, holes, etc. of the inner and outer walls of a general building and expands and foams when exposed to a flame to form a carbonized layer. It is possible to prevent flammable materials such as wood by forming a fire, and even if there is a gap in the construction site, it will expand due to heating,
Since the carbonized layer formed by foaming closes this gap,
It is possible to prevent inflow or outflow of smoke, flame, gas generated by combustion, or the like through the gap.

Since this foam-type fireproof molded article can be molded into a predetermined shape, it is easier to apply and has a uniform thickness as compared with the above-mentioned wet foamable fireproof paint. The foamable fireproof molded article of the present invention has high water resistance as compared with the conventional foamable fireproof molded article described above, so that it is possible to maintain high fireproofness for a long period of time,
Highly fireproof even when used alone in general openings and joints or in combination with standard watertight materials, as the softened and liquefied polyurethane resin does not flow out or the carbonized layer falls off when heated. You can exercise your sexuality.

By molding the foamable fireproof composition according to the present invention, the excellent foamable fireproof molded article can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a test body used in a fireproof test.

FIG. 2 is an explanatory diagram of a fireproof test using the test body.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display area E04B 1/94 H

Claims (2)

[Claims] 1. A foamable fireproof molded article obtained by molding a foamable fireproofing composition containing the following components (A), (B) and (C) as essential components. (A) A polyurethane resin composition comprising a first liquid containing a polyol and a second liquid containing a polyisocyanate. (B) Thermally expandable graphite. (C) Microcapsules obtained by coating ammonium polyphosphate powder with a resin. 2. A foamable fireproofing composition comprising the following components (A), (B) and (C) as essential components. (A) A polyurethane resin composition comprising a first liquid containing a polyol and a second liquid containing a polyisocyanate. (B) Thermally expandable graphite. (C) Microcapsules obtained by coating ammonium polyphosphate powder with a resin.