JPS6044910A - Refractory cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fireproof cable. Recently, fire-related equipment such as fire extinguishing equipment, fire alarm equipment, and evacuation guidance equipment in the event of a fire is required to be equipped with an emergency telephone line. The electric wires used in this emergency power circuit have been tested by the Fire and Disaster Management Agency (840°C).

, 30 minutes).

The present invention relates to a fireproof cable that has passed the Fire and Disaster Management Agency's severe fireproofing test and can be used for low-voltage and high-voltage heavy-duty circuits.

The basic composition of this kind of fireproof cable is on the conductor.

It is constructed by sequentially providing a fireproof layer, an intermediate insulating layer made of polyethylene, etc., and a protective layer made of polyvinyl chloride, etc., but this is different from the conventional technology. For example, a mica glass tape containing silicone varnish is used as the fire-resistant layer, or a tape made of a woven tape made of T-Glass Fino (-) impregnated with a heat-resistant resin of heat-resistant classification HaI or higher. Fireproof cables constructed in this way have the disadvantage that they tend to leave carbon residue when roasted with little decoction, resulting in poor insulation.
(In severe cases, methods are used to minimize the amount of detergent, but in the case of glass mica tape, there is a lack of adhesion between the mica and the glass.)

4.Troubles occurred when taping on the body, and the obtained fireproof cable also had a low dielectric breakdown voltage of 1a, and when using glass tape, threads were easily frayed during taping, resulting in electrical stress. It had the disadvantage that it was easily destroyed and caused poor insulation.

The present invention is intended to improve these drawbacks.
The present invention relates to a fireproof cable in which all insulating layers including a button layer, an intermediate insulating layer, and a protective layer are formed on a conductor in order, and nitrogen psz* is used as an adhesive for the fireproof layer.

The molecule used in the present invention has a residue rate of 107 ft4 obtained with a differential heating balance at a high temperature of 840°C in a 9-element air flow.
below percent. If this residue ratio exceeds 10 weight percent, the insulation resistance characteristics at a diseased temperature, which is caused by a large amount of carbon residue, will be extremely low. This relationship is shown in Figures 1 and 2.
This will be explained with a diagram.

Figure 1 was taken using a commercial differential thermometer.

84 (27 degrees per minute to reach 1℃ in 30 minutes)
．． This is determined by the weight loss curve measured in nine gases at a temperature increase of 8°C. Items with a residue ratio of 10% by weight or more; 1. Silicone resin (Shin-Etsu Chemical Kl (,272),
2 Epoxy resin (Dow DEN438).

3. Polyethylene terephthalate film (Lumirror manufactured by Toshi) with a residue ratio of 10% by weight or less; 4.
Polybutadiene resin (P H-B12O3 manufactured by Nippon Soda)
,5. Adipic acid and ethylene glycol Md compound, 6.
It is a polyethylene film (manufactured by Toshi). A fire-resistant cable was obtained using the polymer adhesive shown in FIG. 1, and a fire-resistance test was conducted. The results are shown in FIG. Changes in insulation resistance characteristics of fire-resistant cables obtained using insulating tapes using polymers 1 to 6 during a heating process of 840°C for 30 minutes according to the indoor fire temperature curve specified in JIS A 1302 were evaluated. It is shown in Figure 2. As can be seen from Figure 5g1 and Figure 2, those with a high residue rate have low insulation resistance in the fire resistance test and cause insulation failure.

Examples of the polymers having a residue ratio of 10% by weight or less include polyethylene resins, polypropylene resins, polyvinyl alcohol horse chestnut resin, acrylic acid polymers, polybutadiene resins, and polyester resins without aromatic rings.
Ru.

When the adhesive in the present invention is used as a adhesive for a fireproof layer,
Even if the amount of impregnation is somewhat increased, the reliability of the fire resistance test can be maintained at -:- minutes, and the insulation properties of the fire resistance layer can be improved.

The enclosing agent used in accordance with the present invention contains - in addition to the above-mentioned polymer, a solvent, a curing catalyst, etc., if necessary.

As the bath agent, toluene, methanol, acetate, etc. can be used.

(CUT, benzyl peroxide.

Peroxides such as zocumyl baroginide, amines such as triethanolamine, and metal compounds such as dibutyltin octoate are used.

In the present invention, the insulating layer provided on the conductor is composed of a fireproof layer, an intermediate insulating layer and a protective layer.

In the present invention, a conductor such as a fused copper wire is used.

,・The fireproof layer provided on the 66 body is glass cloth,
A material obtained by laminating a composite mica using the above-mentioned adhesive onto a base material such as aliphatic plastisol film such as glass yarn or polyethylene film is not used. The base material may be impregnated with the soothing agent without bonding the mica aggregate.

For example, a polyenalene tube is used as the intermediate insulating layer. For example, a polyvinyl chloride tube is used as the protective layer.

For example, the fireproof cable can be equipped as follows.

Wrap the above fireproof layer on the conductor, then form an intermediate insulating layer by extrusion coating, etc.! Line up the L.

On top of this, a protective layer is formed by extrusion coating, etc., and then the fireproof cable is attached.

An example of the inventive 1 m 1 person cable will be described with reference to FIG. 3, which includes 7 conductors, 8 d insulation layer, 9 t insulation layer, and 10 insulation layer.

Detailed description of the invention.

Example 1 Soft laminated mica notebook (manufactured by Hitachi Chemical Co., Ltd., thickness 0
．． 08 mm) and glass cloth (Nitto MM Co., Ltd.
jg! A polyethylene film (25μ manufactured by TOSHI) was sandwiched between WE-o3), and the adhesive layer was made to have a thickness of aO, ]2mo+ insulation tape was obtained.

Example 2 Soft fruit mica/--t (manufactured by Hitachi Chemical Co., Ltd. thickness 8
Coupled with acrylic acid and butyl acrylate (Hitachi Chemical Co., Ltd. ff14A) as a bonding agent to glass cloth (Nittobo Co., Ltd. www-o3) and glass cloth (Nittobo Co., Ltd.
1. ) 103 P) contains tolylene diisono-buto as a curing agent (7 P) was diluted with toluene.

Impregnate so that the amount of adhesive is 12% by weight.

After lamination, the tape was dried by heating at 150° C. for 5 minutes to obtain an insulating tape with a thickness of 0.14 m.

The above zone was taped in a half lap as a refractory layer onto a copper wire with a diameter of 2 m111. Next, this wire was extruded and coated with polyethylene, two of the resulting polyethylene-coated wires were lined up, and polyvinyl chloride was extruded and coated to obtain a fire-resistant cable.

The insulation resistance of the fireproof layer M of the fireproof cable obtained above was measured, and the results are shown in the table below. fc.

In the above test method, as shown in Fig. 2, the fireproof cable 11 obtained above is cut into a total length of 1.3 m, and fixed with fixing parts 12 with 200 holes per interval, and the length of the fireproof cable is 2.3 m.
(The fire temperature curve K1 shown in FIG. 5 was applied by applying a load 13 of 3IllK, and the insulation resistance (MΩ) after 30 minutes of combustion was measured.

It is shown that the fireproof cable according to the present invention has excellent insulation resistance after 30 minutes at 840°C.

[Brief explanation of the drawing]

Fig. 1 is a 1 boarding reduction curve, Fig. 2 is a change in insulation resistance characteristics, Fig. 3 is a cross-sectional view of a fire-resistant cable according to the present invention, and Fig. 4 is a fire-resistant cable of the present invention. A schematic diagram showing the test method and FIG. 5 are fire temperature curve diagrams during the test. Explanation of symbols 7...Conductor 8...Fireproof layer 9...Intermediate insulating layer 10...Retention layer 11...Fireproof cable 12...dig(+13...Loading agent Young patent attorney Kunihiko Hayashi Figure 1/1' (・Figure 2 Figure 3

Claims (1)

[Claims] (2) In a fire-resistant cable in which an insulating layer including a fire-resistant layer, an intermediate insulating layer, and a layer A is sequentially provided on a body, the bonding agent used in the fire-resistant layer is 8 in nitrogen gas of 6 liters.
The residue rate obtained with a high-speed temperature rise differential thermal balance up to 40℃ is 10
A fireproof cable made of polymer with a weight below 1%.