JP3463461B2 - Fireproof sealant for fire spread prevention - Google Patents

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 of a wall or a floor on which an electric wire or cable is routed.

[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 the adjacent rooms or floors through the through holes in the walls or floors, so once a fire occurs, they will spread to the adjacent rooms or floors through the through holes in the walls or floors and spread the damage. May cause

Therefore, in order to minimize the spread of fire due to fire, electric wires and cables have recently been made highly flame-retardant. On the other hand, development of a fire-resistant sealant having excellent fire spread resistance even for through holes in walls and floors is underway. As a result, we proposed a method of filling the openings of through holes in walls and floors with a fire-resistant filler such as rock wool or borax, and then using a fire-resistant sealing material for preventing fire spread that easily carbonizes and solidifies at high temperatures. Has been widely adopted now.

[0004]

However, according to the conventional construction method, after the fire prevention measures are applied to the penetrations of the electric wires / cables, the fire protection measures are disassembled and re-installed in order to expand the electric wires / cables. Since the work is frequently done, there were the following problems. (1) When adding wires / cables, it is necessary to remove the refractory filler in the openings, or after the completion of the addition,
This requires a large amount of work man-hours such as having to fill the refractory filler again. (2) Also, if there is a switchboard under the opening, the refractory filler will fall during the expansion and soil the switchboard.

[0005]

OBJECTS OF THE INVENTION Therefore, an object of the present invention is to improve the workability of dismantling and re-constructing the opening when an electric wire or cable is added, and to prevent the spread of the refractory filler. It is to provide a stopping material.

[0006]

In order to achieve the above object, the present invention has a pitch of 5 parts by weight or more, an alkali silicic acid compound of 10 to 200 polymerization parts, and a heat resistant fiber of 1 to 50 parts by weight with respect to 100 parts by weight of a liquid polymer. Parts, and inorganic filler 10 to
The present invention provides a fire-resistant sealing material for preventing fire spread, which is characterized by comprising 200 parts by weight.

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

In the present invention, it has been found that pitch is effective as a carbonization accelerator for enhancing the solidification property of these liquid polymers. There are coal-based and petroleum-based pitches, and it is necessary to add 5 parts by weight or more to 100 parts by weight of the liquid polymer. Below the limit value, the carbonization promoting effect of the intended polymer is small and the cable spread is significantly large. Become.

In the present invention, an alkali silicic acid compound is added as the foaming agent. Sodium metasilicate is a typical example of the alkali silicate compound, and there are 9-hydrate, 8-hydrate, 6-hydrate, 5-hydrate, and 1-hydrate depending on the binding state of crystal water. Aqueous salt is preferred. This addition amount needs to be 10 to 200 parts by weight with respect to 100 parts by weight of the liquid polymer, and if it is less than the limit value, the desired foamability cannot be imparted, while if it exceeds the limit value, the bundling property is remarkably impaired. It becomes difficult to mold a certain shape.

Further, in the present invention, a heat resistant fiber and an inorganic filler are added. The heat resistant fiber imparts shape retention property at high temperature, and is represented by glass fiber, carbon fiber, phenol fiber and aramid fiber. These need to 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, the shape retention at high temperature is poor, and if the amount exceeds the limit value, the moldability is significantly impaired.

The inorganic filler is for imparting shape retention and heat insulating properties at high temperatures. Examples of the inorganic filler include talc, clay, calcium carbonate and aluminum hydroxide,
Examples thereof include metal hydroxides represented by magnesium hydroxide, and it is particularly preferable to use the latter metal hydroxide having an endothermic effect. For 100 parts by weight of liquid polymer,
It is necessary to use the inorganic filler in an amount of 10 to 200 parts by weight, and if it is less than the limit value, the shape retention property at high temperature is poor, and the heat insulating property is significantly lowered. On the other hand, when it exceeds the limit value, the kneading property and the moldability are remarkably lowered.

[0012]

EXAMPLES Table 1 shows examples and comparative examples.

[0013]

[Table 1]

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

1. Sheet evaluation 50 mm x 50 mm x 1 mm prepared compound
After being molded into a shape of No. 1 and then put in an electric furnace kept at 400 ° C. for 30 minutes, the following evaluation was performed. (1) Expansion ratio After cooling the sample taken out from the electric furnace to room temperature, the shape was measured to obtain the expansion ratio. Here, the expansion ratio is calculated by the following formula.

Expansion ratio = volume after test (cm ³ ) / volume before test (cm ³ ) (2) Compressive strength After measurement of expansion ratio, compression rate 2 mm / using a compression tester (Strograph, manufactured by Toyo Seiki) The compressive strength was calculated from the load when compressed in minutes and compressed to 20% of the thickness after heat treatment. The compressive strength is calculated by the following formula. The values in Table 1 are average values of 3 points.

[0017] Compressive strength (kpa) = compressive load / area of load part

2. Fire resistance test The fire resistance test was evaluated by 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 having a steel frame 25 and upper and lower calcium silicate plates 20 and an opening 23 having a height of 175 mm. The encapsulating material 21 was attached to each penetrating portion 24 in a shape of 100φ × 50 mm. A cable-shaped sheet-shaped sealing material 22 having a sheet shape of 5 mm thick and 50 mm was further wound around the sealing material 21 provided on the upper portion.

The test piece produced in this way is compliant with JIS
According to A1304 "Fireproof test method of building structure part",
A fire resistance test was conducted for 2 hours. After that, the presence of carbonization of the sheath on the upper surface of the sheet is checked, and according to the rating method of BCJ (Foundation for Japanese Architecture), no carbonization of the sheath is observed, and the sheet whose upper surface does not exceed 340 ° C passes. Was rejected.

As is clear from Table 1, Examples 1 to 3 of the present invention are appropriately expanded 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 within the standard. I was satisfied and passed the fire resistance test.

On the other hand, in Comparative Example 1 in which the amount of pitch added was not limited, as can be seen from the compressive strength, the carbide was brittle and the fire shielding effect was small, so sheath carbonization occurred in the fire resistance test and it was rejected. It was In Comparative Example 2 in which the admixture amount of the alkali silicate compound is less than the limited value, the expansion ratio is low, so the heat insulating effect is small and sheath carbonization occurs, resulting in failure. In Comparative Example 3 in which the amount exceeds the limited value, the expansion ratio is high. The compressive strength was low and it failed the fire resistance test. In Comparative Example 4 in which the amount of heat-resistant fiber added was less than the specified value, the encapsulant was significantly deformed as the temperature increased, and the fire resistance test failed. In Comparative Example 5, in which the amount of added heat-resistant fiber exceeded the specified value, kneading and molding were performed. Is difficult.

Further, in Comparative Examples 6 and 7 in which the amount of the inorganic filler mixed was out of the limit value, the compressive strength or expansion ratio of the carbide was low, and it failed the fire resistance test.

It should be noted that Japanese Patent Laid-Open No. 63-132993 discloses a fire-resistant sealant for preventing fire spread which contains a liquid polymer, aluminum hydroxide, heat-resistant fibers and expandable graphite, but contains an alkali silicate compound. Therefore, as in Comparative Examples 1 to 7, sheath carbonization occurs and fails the fire resistance test.

As described above, according to Examples 1 to 3 of the present invention, it expands moderately by heating, and the compressive strength of carbides is also high. As a result, there is no sheath carbonization on the upper surface of the sheet and the temperature also satisfies the standard. And passed the fire resistance test. Therefore, it is possible to provide excellent fire resistance performance without filling the opening with the fire resistant filler.

[0025]

As described above, according to the fire spread sealing material of the present invention for preventing the spread of fire, the composition is such that the pitch is 5 parts by weight or more, the alkali silicic acid compound is 10 to 200 polymerization parts, relative to 100 parts by weight of the liquid polymer. Since the composition is composed of 1 to 50 parts by weight of heat resistant fiber and 10 to 200 parts by weight of inorganic filler, excellent fire resistance performance can be imparted. Therefore, it is not necessary to fill the opening with the refractory filler,
Workability at the time of disassembling and reconstructing the opening can be greatly improved. In other words, the refractory filler is not filled in the opening, so that the refractory filler is not scattered.

[Brief description of drawings]

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

FIG. 2 is a plan view of FIG.

[Explanation of symbols]

10 cables 20 Calcium silicate board 21 Sealant 22 Sheet-shaped sealing material 23 opening 24 Penetration part 25 steel frame

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI C08L 11/00 C08L 11/00 95/00 95/00 101/00 101/00 C09K 3/10 C09K 3/10 (72) Invention Kazuhiko Kobayashi 5-1-1 Hidaka-cho, Hitachi City, Ibaraki Prefecture Hidaka Electric Cable Co., Ltd. Hidaka Factory (72) Inventor Kunio Kimura 5-1-1 Hidaka-cho Hitachi City, Ibaraki Hitachi Stock In-house (56) References JP 56-98274 (JP, A) JP 63-132993 (JP, A) JP 54-73498 (JP, A) (58) Fields investigated (Int.Cl . ⁷ , DB name) C09K 21/14 C09K 3/10 C08K 3/00-7/00 C08L 9/00-101/00 Patent file (PATOLIS)

Claims (3)

(57) [Claims] 1. A pitch of 5 with respect to 100 parts by weight of a liquid polymer.
10 parts by weight to 200 parts by weight of an alkali silicate compound,
1 to 50 parts by weight of heat resistant fiber, and 10 to 20 inorganic filler
A fireproof encapsulant for preventing the spread of fire, which comprises 0 part by weight. 2. The liquid polymer is acrylonitrile butadiene rubber or polychloroprene.
Fireproof encapsulant for fire spread prevention. 3. The fire-resistant sealant for preventing the spread of fire according to claim 1, wherein the inorganic filler is a metal hydroxide.