JPS5837766B2 - Seal material for preventing the spread of fire on electric wires and cables - Google Patents

Description

[Detailed Description of the Invention] The present invention provides electric wires and cables that pass through walls or floors;
The present invention also relates to improvements in sealing materials for preventing the spread of fire in electric wires and cables routed within vertical ducts.

In the event of a fire, electric wires and cables that are wired in buildings and covered with combustible materials such as polyethylene and polyvinyl chloride may spread, damaging control facilities and causing greater damage.

For this reason, a method has been taken to prevent the spread of fire by applying fire-spread prevention paint to existing electric wires and cables.

However, with this force method, sufficient fire spread prevention effects could not be expected at wall-penetrating portions or floor-penetrating portions of electric wires and cables, or in wiring in vertical ducts due to the chimney effect.

For this reason, the above-mentioned areas are filled with oil-based flame-retardant putty to block air.

However, the putty used for this purpose has the problem that a large amount of halogenated hydrocarbon (about 50%) is added in order to make the putty flame retardant, so it generates a large amount of harmful gas in the event of a fire.

In view of the above points, the present inventor has conducted various studies from both the fire spread prevention effect and the environmental aspect, and has found that the present invention sufficiently prevents the spread of fire even in the event of a fire, generates less harmful gas, and has excellent workability. They have discovered a sealing material that contains 5-20% by weight of an oil binder, 0.1-15% by weight of high-temperature nonflammable fibers, and 2-15% by weight of an organic flame retardant.
, is characterized by comprising a composition containing 50 to 90% by weight of two or more types of inorganic powders having different average particle diameters.

Oil binder: This is essential when making putty-like sealing materials, and soybean oil, linseed oil, etc. are usually used.

The blending amount was set at 5 to 20% by weight because if it was less than 5% by weight, it would not form a sufficient putty-like shape and the work would be difficult.
This is because the flame retardant effect is impaired if the amount exceeds % by weight.

High-temperature-resistant nonflammable fibers: These exhibit the effect of reinforcing agents, and are preferably inorganic fibers such as asbestos, or organic fibers that do not melt even when heated at high temperatures, such as phenol fibers.

The blending amount is 0.1-15? The amount percentage is 0.1% by weight.
If it is less than 15% by weight, the reinforcing effect is not desired, and if it is more than 15% by weight, workability becomes poor.

Organic flame retardant: A substance that exhibits a flame retardant effect, such as paraffin chloride and hexabromobenzene (HBB). This is because if the content exceeds 15% by weight, the amount of harmful gases generated increases.

This amount can be reduced by increasing the amount of inorganic powder, and the generation of harmful gases will be reduced accordingly.

Inorganic powder: Two or more types of inorganic powder are used, one having an average particle diameter of, for example, about several microns and one having an average particle diameter of about several tens of microns.

If a large amount of particles with a large average particle size is used, the composition will fall apart and it will be difficult to form a good putty.
By using it in combination with those having a small average particle size, the total amount can be increased, and as described above, the amount of organic flame retardant can also be reduced accordingly.

As described above, the total amount should be determined by taking into consideration the balance with the amount of other compounding ingredients, especially the organic flame retardant, workability, etc., and according to the results of the research conducted by the present inventors, 50 to 90% by weight is desirable.

In this case, it is preferable to use two or more types of inorganic powders with different average particle diameters in a ratio of at least 1:5, and those with small average particle diameters should be used in an amount of 30% or more by weight based on the entire composition. It is desirable to have one.

The inorganic powders actually used are aluminum hydroxide, which is used to increase the effect of preventing the spread of fire, and clay, which is used to firmly maintain the shape of the seal after combustion to prevent the chimney phenomenon and ensure the effect of preventing the spread of fire. Organic substances that turn into ceramics when heated at high temperatures are suitable, such as borax, nodal silicate, and zinc borate.

Experimental Results Three control polyethylene insulated polyethylene sheathed cables with 3 cores and 2 square wear were passed through a metal pipe with a diameter of 10 cm, filled with various sealing materials to a thickness of 10 crrL, and heated from below with a Punsen burner for 10 minutes.

The following table shows the results of measuring the workability of the sealant pawl, smoke leakage during combustion, and cable surface temperature.

As a result, it was confirmed that the cables using the sealing material of the present invention had good workability, had no smoke leakage during combustion, and had little rise in cable surface temperature during combustion.

As described above, the sealing material of the present invention exhibits the above-mentioned good sealing effect for preventing the spread of fire due to the combination of the various ingredients.

[Brief explanation of the drawing]

The drawing is an explanatory diagram of a method for measuring cable surface temperature in a combustion experiment of electric wire and cable using a sealing material. In the drawing, 1 is a metal pipe, 2 is a cable, 3 is a sealing material,
4 is a gas burner and 5 is a thermocouple.

Claims (1)

[Claims] 1. 5 to 20% by weight of oil binder, high temperature resistant non-flammable fiber o
．． An electric wire characterized in that it is made of a composite material containing 15% by weight of i to 15% by weight, 2 to 15% by weight of an organic flame retardant, and 50 to 90% by weight of two or more types of inorganic powders having different average particle diameters. Cinobi material 102 for preventing the spread of fire in cables Average particle size is at least 1:
The sealing material for preventing the spread of fire for electric wires and cables according to claim 1, characterized in that it is made of a combination containing two or more kinds of inorganic powders that differ in a ratio of 5 or more. 3 The average particle size of the inorganic powder with a small average particle size is 10μ
The content is 30% by weight based on Kumikaimono.
The sealing material for preventing the spread of fire of electric wires and cables according to claims 1 and 2, which is characterized by the above.