JPH108058A - Refractory sealing material for preventing fire spreading - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject sealing material capable of improving workability of the dismantling of an opening part when extending an electric wire and performing reexecution and preventing the scattering of a refractory filer, by adding a phosphorus-based flame-retardant, a polyhydric alcohol, etc., in a specific ratio to a liquid polymer. SOLUTION: This material comprises (A) 100 pts.wt. of a liquid polymer, (B) >=5 pts.wt. of a phosphorus-based flame-retardant (e.g. ammonium polyphosphate), (C) >=5 pts.wt. of a polyhydric alcohol (e.g. pentaerythritol), (D) 10-200 pts.wt. of an alkali silicic acid compound (e.g. sodium metasilicate), (E) 1-50 pts.wt. of heat-resistant fibers (e.g. glass fibers) and (F) 10-200 pts.wt. of an inorganic filler. Preferably, the component A is an acrylonitrile butadiene rubber or a polychloroprene and the component F is a metal hydroxide such as aluminum hydroxide.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fireproof sealant for preventing fire spread, and more particularly to a fireproof sealant for preventing fire spread used in a through hole in a wall or a floor where wires and cables are wired.

[0002]

2. Description of the Related Art A large amount of electric wires and cables are laid in buildings and factories. These are wired to adjacent rooms or floors through through holes in walls and floors, so once a fire occurs, they spread to adjacent rooms and floors through through holes in walls and floors and spread damage. May cause

[0003] In order to minimize the spread of fire due to a fire, recently, the flame resistance of electric wires and cables has been increased. On the other hand, development of a fire-resistant sealing material excellent in fire spread resistance even for through holes in walls and floors has been promoted. As a result, a proposal was made to fill the openings of the through-holes in the walls and floors with fire-resistant fillers such as rock wool and borax, and then use a fire-resistant sealant to prevent the spread of fire, which is easily carbonized and solidified at high temperatures. It is now widely adopted.

[0004]

However, according to the conventional construction method, after a fire prevention measure is applied to a penetrating portion of an electric wire / cable, a part where the fire prevention measure is applied to extend an electric wire / cable is disassembled and re-installed. Since construction is frequently performed, there are the following problems. (1) When adding wires and cables, it is necessary to remove the refractory filler in the opening.
The number of work steps is greatly increased, such as the necessity of refilling the refractory filler. (2) If there is a switchboard below the opening, the refractory filler drops when the switchboard is installed, and contaminates the switchboard.

[0005]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to improve the workability of disassembling and re-installing an opening at the time of adding wires and cables, and to prevent the spread of a fire-resistant filler in a fireproof fireproof seal. It is to provide a stopping material.

[0006]

In order to achieve the above object, the present invention provides a liquid polymer having 100 parts by weight of a phosphorus-based flame retardant of 5 parts by weight or more, a polyhydric alcohol of 5 parts by weight or more, and an alkali silicate compound of 10 parts or more. ~ 200 polymerized parts, heat resistant fibers 1-5
The present invention provides a fireproof sealant for preventing fire spread, comprising 0 parts by weight and 10 to 200 parts by weight of an inorganic filler.

The liquid polymer used as the fire-resistant sealing material for preventing fire spread according to the present invention includes polyisoprene, polyisobutylene, polybutene, polybutadiene, acrylonitrile butadiene rubber, polychloroprene, silicone,
Polyurethane, polysulfide and the like can be mentioned, and particularly, acrylonitrile-butadiene rubber or polychloroprene is excellent in solidification of a foam formed during combustion, and is suitable as a sealing material.

[0008] As a carbonization accelerator for improving solidification, a phosphorus-based flame retardant and a polyhydric alcohol are used in combination. this house,
Representative examples of the phosphorus-based flame retardants include ammonium polyphosphate, butyl pyrophosphate, butyl acid phosphate, melamine phosphate, dimelamine phosphate, and red phosphorus. Examples of the polyhydric alcohol used in combination therewith include pentaerythritol, dipentaerythritol and mannitol. All of these must be added in an amount of 5 parts by weight or more based on 100 parts by weight of the liquid polymer. If the amount is less than the specified value, the effect of promoting the carbonization of the target polymer is small, and the fire spread of the cable is significantly increased.

As these foaming agents, alkali silicate compounds are added. As the alkali silicate compound, sodium metasilicate is a typical example.
There are water salt, octahydrate, hexahydrate, pentahydrate and monohydrate, but 9-hydrate is preferred from the viewpoint of foamability. The amount added is 10
With respect to 0 parts by weight, it is necessary to be 10 to 200 parts by weight, and if the amount is less than the limit value, the desired foaming property cannot be imparted. Become.

[0010] Further, heat-resistant fibers and an inorganic filler are added.
The heat-resistant fiber gives shape retention at high temperatures,
Typical examples include glass fiber, carbon fiber, phenol fiber, and aramid fiber. These should be 1 to 50 parts by weight with respect to 100 parts by weight of the liquid polymer. If the amount is less than the limit value, shape retention at high temperatures is poor, and if the amount exceeds the limit value, moldability is significantly impaired. Inorganic fillers are used to provide shape retention and heat insulation at high temperatures. As inorganic fillers, metal hydroxides represented by talc, clay, calcium carbonate, aluminum hydroxide, and magnesium hydroxide Among them, it is particularly preferable to use the latter metal hydroxide having an endothermic effect. The amount of the inorganic filler must be 10 to 200 parts by weight with respect to 100 parts by weight of the liquid polymer. If the amount is less than the specified value, the shape retention at high temperatures is poor, and the heat insulating property is significantly reduced. On the other hand, if it exceeds the limit value, kneadability and moldability will be significantly reduced.

[0011]

EXAMPLES Table 1 shows Examples and Comparative Examples.

[Table 1]

Using a kneader having a capacity of 3 liters, the compounding ingredients shown in Table 1 were added all at once, and kneaded at room temperature for 10 minutes to prepare a compound.

1. Sheet evaluation The prepared compound was subjected to 50 mm x 50 mm x 1 mm
And then placed in an electric furnace maintained at 400 ° C. for 30 minutes, and the following evaluation was performed. (1) Expansion magnification After the sample taken out of the electric furnace was cooled to room temperature, the shape was measured to determine the expansion magnification. Here, the expansion ratio is obtained by the following equation. Expansion ratio = volume after test (cm ³ ) / volume before test (c
m ³ ) (2) Compressive strength After measuring the expansion ratio, the sample was compressed at a compression speed of 2 mm / min using a compression tester (Strograph, manufactured by Toyo Seiki) and the load when compressed to 20% of the thickness after heat treatment was obtained. The compressive strength was calculated. The compressive strength is determined by the following equation. The values in Table 1 were average values of three points. Compressive strength (kpa) = compressive load / area of load section

2. Fire Resistance Test The fire resistance test was evaluated using the structure shown in FIG. That is, the crosslinked polyethylene vinyl sheath cable 10 having a conductor size of 325 mm ² was incorporated into a calcium silicate structure composed of a steel frame 25 and upper and lower calcium silicate plates 20 and having a height of an opening 23 of 175 mm, as shown in Table 1. The sealing material 21 was attached to each through portion 24 in a shape of 100φ × 50 mm. Note that a sheet-like sealing material 22 having a sheet shape of 5 mm thick × 50 mm was further wound around the cable 10 on the sealing material 21 provided on the upper part. The test specimen prepared in this manner was subjected to a 2-hour fire resistance test according to JIS A1304 “Fire resistance test method for building structure”. Thereafter, the presence or absence of sheath carbonization on the upper surface of the sheet is checked,
According to the rating method of CJ (Japan Building Center), no carbonization of the sheath was observed and the upper surface of the sheet was 34
Those that did not exceed 0 ° C were accepted, and those that were not passed were not accepted.

As is clear from Table 1, Examples 1 to 3 of the present invention expand moderately by heating and have a high compressive strength of carbides. As a result, there is no sheath carbonization on the upper surface of the sheet, and the temperature is also regulated. Satisfied and passed fire test.

On the other hand, in Comparative Examples 1 and 2 in which the amount of the phosphorus-based flame retardant or polyhydric alcohol added was not limited, as can be seen from the compressive strength, the carbide was brittle and the fire shielding effect was small, so the fire resistance test was performed. Caused carbonization of the sheath and was rejected. In Comparative Example 3 in which the mixing amount of the alkali silicate compound was less than the limit value, the expansion ratio was low, so that the heat insulating effect was small, sheath carbonization occurred, and the sample was rejected.
On the contrary, the expansion ratio was high, but the compressive strength was low, and the fire resistance test was rejected. In Comparative Example 5 in which the amount of heat-resistant fiber added was less than the limit value, the sealing material was significantly deformed with the rise in temperature, failed in the fire resistance test, and in Comparative Example 6 in which the amount of heat-resistant fiber exceeded the limit value, kneading and molding were performed. Is difficult.

In Comparative Examples 7 and 8 in which the amount of the inorganic filler mixed was out of the specified range, the compressive strength or expansion ratio of the carbide was low, and the fire test failed.

According to Japanese Patent Application Laid-Open No. 58-53964, a fireproof sealant for preventing fire spread containing a liquid polymer, aluminum hydroxide, a phosphorus-based flame retardant, and a polyhydric alcohol is disclosed. JP-A-52-146996 discloses a fireproof sealing material for preventing fire spread, which contains an inorganic filler, heat-resistant fiber, silica sol and polyhydric alcohol. Therefore, a fire-resistant sealant for preventing fire spread disclosed in JP-A-58-53964 contains an inorganic filler, heat-resistant fiber, silica sol and polyhydric alcohol disclosed in JP-A-52-146996. Assume that the sealing material is manufactured with the same contents. However, since the mixing amount of the inorganic filler is out of the limit value, it fails in the heat resistance test as in Comparative Examples 7 and 8.

As described above, according to Examples 1 to 3 of the present invention, the resin expands appropriately by heating, and has a high compressive strength of the carbide. As a result, there is no sheath carbonization on the upper surface of the sheet, and the temperature satisfies the standard. And passed the fire resistance test. Therefore, excellent fire resistance performance can be imparted without filling the opening with a fire resistant filler.

[0020]

As described above, according to the fire-resistant sealant for preventing fire spread according to the present invention, the composition is 5 parts by weight or more of phosphorus-based flame retardant and 5 parts by weight of polyhydric alcohol with respect to 100 parts by weight of liquid polymer. As described above, 10 to 200 polymer parts of the alkali silicate compound, 1 to 50 parts by weight of the heat-resistant fiber, and 10 to 10 parts by weight of the inorganic filler
Since the composition is 200 parts by weight, excellent fire resistance can be imparted. For this reason, it is not necessary to fill the opening with a refractory filler, and workability at the time of disassembling and reconstructing the opening can be greatly improved. In other words, since the opening is not filled with the refractory filler, the effect of eliminating scattering of the refractory filler is also provided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a calcium silicate structure for a fire resistance test.

FIG. 2 is a plan view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cable 20 Calcium silicate board 21 Sealing material 22 Sheet-like sealing material 23 Opening 24 Penetrating part 25 Steel frame

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location C08K 7/02 KDW C08K 7/02 KDW C08L 9/02 C08L 9/02 11/00 11/00 C09D 5/34 PRC C09D 5/34 PRC 109/02 PGP 109/02 PGP 111/00 111/00 C09K 3/10 C09K 3/10 N (72) Inventor Kazuhiko Kobayashi 5-1-1 Hidaka-cho, Hitachi City, Ibaraki Prefecture 1 Hitachi Cable Co., Ltd. Hidaka Factory (72) Kunio Kimura Inventor 5-1-1 Hidaka-cho, Hitachi City, Ibaraki Prefecture Inside Hitachi Cable FM Co., Ltd.

Claims (3)

[Claims] 1 to 100 parts by weight of a liquid polymer, 5 parts by weight or more of a phosphorus-based flame retardant, 5 parts by weight of a polyhydric alcohol, 10 to 200 parts by weight of an alkali silicate compound, and 1 to 50 parts of a heat-resistant fiber.
A fireproof sealant for preventing fire spread, which comprises 10 parts by weight and 10 to 200 parts by weight of an inorganic filler. 2. The liquid polymer is acrylonitrile butadiene rubber or polychloroprene.
Fireproof sealant for preventing the spread of fire. 3. The fireproof sealant according to claim 1, wherein said inorganic filler is a metal hydroxide.