KR101735695B1 - Highly Fire Resistant Cable - Google Patents

Abstract

The present invention provides a high refractory cable comprising at least one conductor, an insulation layer surrounding the conductor, a sheath layer surrounding the insulation layer, and a complex refractory layer surrounding the sheath layer, wherein the complex refractory layer comprises a metal hydroxide and a polymeric binder A base layer (a) surrounding the base layer, an intermediate layer (b) surrounding the base layer and a foamed polymer, and an outer layer (c) surrounding the intermediate layer and made of a metal hydroxide and a polymer binder. The high-refractory cable of the present invention has excellent fire resistance characteristics that do not break the cable structure due to the high-temperature flame, so that the transmission characteristics can be ensured for a certain period of time.

Description

{Highly Fire Resistant Cable}

The present invention relates to a high-refractory cable capable of preventing heat from being transferred into a cable even at a high temperature.

In general, fireproof cables are used in fire-fighting, construction, machinery, and marine cables that require high fire resistance, which must withstand high heat. Especially, refractory cable is used for fire protection in case of fire, and it is able to supply electric current among the combustion of cable caused by fire, so it transmits power to emergency fire alarm device, sprinkler, emergency generator and is useful for internal escape and fire suppression .

1, the refractory cable includes a conductor 1, a refractory layer 2 surrounding the conductor and imparting a refractory characteristic, an insulation layer 3 surrounding the refractory layer to provide an insulation characteristic, A tape layer 5 surrounding the filler, an inner sheath layer 6 surrounding the tape layer, a foamed polymer layer 7 surrounding the inner sheath layer, an outer layer surrounding the foamed polymer layer 7, And a sheath layer (9).

Among them, the foamed polymer layer 7 contains a foaming agent for forming bubbles, and when the reaction temperature exceeds a critical temperature, the foaming agent reacts. As a result, the foam of the foamed polymer layer 7 expands and bubbles are generated to form a charring layer in which voids are formed, and heat transfer to the inside of the cable is minimized. However, the foamed polymer layer 7 of the prior art as described above has excellent heat insulation characteristics but has a weak problem in the flame.

To solve such a problem, a refractory cable having a structure in which a refractory tape such as a mica tape is added between the foamed polymer layer 7 and the outer sheath layer 9 has been devised. However, this refractory cable causes another problem that the refractory tape is torn or the outer sheath layer 9 is broken due to expansion of the foamed polymer layer 7, failing to sufficiently perform its function as a heat shielding layer .

On the other hand, a refractory cable using a silicone foam instead of a foamed polymer layer or a refractory cable using a silicone resin as an insulating material by winding a foamed polymer layer with a refractory tape was devised as a refractory cable having enhanced fire resistance characteristics. When the temperature rises due to the flame, the silicone resin is decomposed to form silicon oxide ash or char having an insulating property, and is adsorbed on the refractory tape to enhance the fire resistance characteristics of the cable. However, cracks tend to occur due to insufficient adhesion between formed ash and char, and heat is transferred to the inside of the cable through the cracks.

As another method for preventing the heat from being transferred into the cable, an inner sheath layer 6 or an outer sheath layer 9 is formed by a refractory composition including a polymer and fibrous phyllosilicate There is a way. However, the inner sheath layer (6) or the outer sheath layer (9) formed of the refractory composition is burnt within 2 to 6 minutes at an ultra-high temperature of 1100 DEG C or more, and heat is transferred to the inside of the cable. Especially, in the case of a conductor formed of copper, melting phenomenon occurred at 1080 ° C.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a polymer electrolyte fuel cell comprising a base layer comprising a metal hydroxide and a polymer binder, an intermediate layer comprising a foamed polymer surrounding the base layer, It is an object of the present invention to provide a high-refractory cable having excellent refractory properties even at a temperature of 1000 캜 or higher, including a composite refractory layer composed of layers.

The present invention provides a high refractory cable comprising at least one conductor, an insulation layer surrounding the conductor, a sheath layer surrounding the insulation layer, and a complex refractory layer surrounding the sheath layer, wherein the complex refractory layer comprises a metal hydroxide and a polymeric binder An intermediate layer comprising a foamed polymer surrounding the base layer, and an outer layer consisting of a metal hydroxide and a polymer binder surrounding the intermediate layer.

The high refractory cable of the present invention is excellent in flexibility and suspendability of the cable at a low temperature of less than 100 캜 due to the polymer binder contained in the composite refractory layer. In addition, the cable structure is not broken at a high temperature exceeding 400 캜 by the flame, and has a fire resistance characteristic capable of ensuring transmission characteristics so that the cable can function for a certain time even at a temperature of 1000 캜 or higher.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. No.
1 is a cross-sectional view of a conventional refractory cable.
FIG. 2 is a cross-sectional view of a refractory cable according to an embodiment of the present invention. The conductor 10, the first refractory layer 20, the insulating layer 30, the filler 40, the tape layer 50, (60), a composite refractory layer (70), and an outer sheath layer (90).
3 shows a cross-sectional view of a refractory cable in accordance with an embodiment of the present invention, which includes a conductor 10, a first refractory layer 20, an insulating layer 30, a filler 40, a tape layer 50, A base layer 70a, an intermediate layer 70b, an outer layer 70c and an outer sheath layer 90 of the composite refractory layer.
Fig. 4 is a view showing a reaction occurring in the complex refractory layer of the refractory cable of the present invention by an external flame.
FIG. 5 is a view showing a state that the refractory cable of FIG. 3 is deformed by an external flame.
6 illustrates a cross-sectional view of a refractory cable in accordance with an embodiment of the present invention that includes a conductor 110, a first refractory layer 120, an insulating layer 130, a filler 140, a tape layer 150, An intermediate layer 170b, an outer layer 170c, a second refractory layer 180, and an outer sheath layer 190. The base layer 170a, the intermediate layer 170b, the outer layer 170c,
7 is a view showing a state where the refractory cable of FIG. 6 is deformed by an external flame.

Hereinafter, the present invention will be specifically described.

The present invention provides a high refractory cable comprising at least one conductor, an insulation layer surrounding the conductor, a sheath layer surrounding the insulation layer, and a complex refractory layer surrounding the sheath layer, wherein the complex refractory layer comprises three layers have. Specifically, the composite refractory layer includes a base layer (a) composed of a metal hydroxide and a polymer binder, an intermediate layer (b) composed of a foamed polymer surrounding the base layer, and an outer layer (c) surrounding the intermediate layer and composed of a metal hydroxide and a polymer binder .

Preferably, the present invention may further include a first refractory layer disposed between the conductor and the insulating layer, the first refractory layer surrounding the conductor and containing mica. That is, the high-refractory cable of the present invention can be composed of a conductor, a first refractory layer, an insulating layer, a sheath layer, and a composite refractory layer.

Preferably, the present invention may further include a second refractory layer surrounding the complex refractory layer and containing mica, and may further include an outer sheath layer surrounding the second refractory layer. That is, the high-refractory cable according to the present invention comprises a conductor, an insulating layer, a sheath layer, a composite refractory layer, and a second refractory layer, or may be a conductor, a first refractory layer, an insulating layer, a sheath layer, And an outer sheath layer.

As one embodiment of the high-refractory cable of the present invention, it may have a structure as shown in Fig. That is, the high-refractory cable of the present invention includes at least one conductor 10, a first refractory layer 20 surrounding the conductor, an insulation layer 30 surrounding the first refractory layer, a filler 40 A tape layer 50 surrounding the filler, a sheath layer 60 surrounding the tape layer, a complex refractory layer 70 surrounding the sheath layer, and an outer sheath layer 90 surrounding the complex refractory layer .

The high-refractory cable according to the present invention, which specifically shows the base layer 70a, the intermediate layer 70b and the outer layer 70c constituting the composite refractory layer 70, is shown in Fig.

The conductor 10 is made of a single wire or is made by twisting two or more metal wires, mainly copper or aluminum, and is also used in the form of a plated or alloy.

A glass fiber or a polyester fabric is used as the base material of the first refractory layer 20 and a mica tape containing phlogopite in the form of mica powder having excellent fire resistance characteristics is used as the first refractory layer .

The insulating layer 30 surrounds the refractory layer 20 and is formed of at least one selected from the group consisting of a crosslinked polyethylene resin and an ethylene propylene rubber.

The filler 40 is a material that fills the void space between the insulating layer 30 and the tape layer 50. The filler 40 may be made of polypropylene (PP), polyvinyl chloride (PVC), ethylene propylene diene monomer (EPDM) monomer, polyester yarn, aramid yarn and the like are used.

The tape layer 50 covers the insulating layer 30 and the filler 40 and is wrapped around the tape layer 50. The tape layer 50 maintains the assembled state of the tape layer 50. The tape layer 50 is made of polyethylene terephthalate (PET), polyethylene (PE), polypropylene ), A nonwoven fabric or the like is used.

The sheath layer 60 is a layer for physically and chemically protecting the inside of the cable, and contains a flame retardant of a halogen-free compound having a flame retarding property. As such a flame retardant, it is possible to use, from the group consisting of chlorosulphonated polyethylene (CSP), polyvinyl chloride (PVC), polyethylene (PE), chloroprene rubber (CR), ethylene methacrylate (EMA) and ethylene vinyl acetate At least one selected is used.

The composite refractory layer 70 includes a base layer 70a made of metal hydroxide and a polymer binder, an intermediate layer 70b made of a foamed polymer surrounding the base layer, and an outer layer 70c surrounding the intermediate layer and made of a metal hydroxide and a polymer binder .

The base layer 70a of the composite refractory layer 70 functions to improve fire resistance and durability.

The intermediate layer 70b of the composite refractory layer 70 is formed of a foamed polymer and maintains the same shape as a general polymer layer at room temperature. However, when heated to an elevated temperature by an external flame, Expands. Since the thermal conductivity of the gas is lower than that of the solid, when the polymer layer of the solid form is changed into the polymer layer having the pores filled with the gas, the outer shape of the intermediate layer of the complex refractory layer 70 is maintained and the thermal conductivity is much lowered. As a result, it functions to minimize heat transfer to the inside of the cable. The intermediate layer of the composite refractory layer is preferably formed of at least one selected from the group consisting of foamed polyolefin, foamed silicone and foamed polyurethane.

The outer layer 70c of the complex refractory layer 70 functions to prevent direct flame contact with the intermediate layer of the complex refractory layer.

The base layer 70a and the outer layer 70c of the composite refractory layer contain a polymer hydroxide decomposing at a temperature of 200 ° C or higher and a polymer binder decomposing and decomposing at a temperature of 100 ° C or higher, . The reaction shown in Fig. 4 occurs in the base layer 70a and the outer layer 70c of the complex refractory layer due to the high-temperature flame. That is, the metal hydroxide is decomposed into metal oxides and water vapor (H ₂ O) that can withstand temperatures of 1100 ° C. or higher due to the high temperature external flame. Since the reaction is an endothermic reaction, . Further, the polymer binder is decomposed and evaporated, leaving pores in the sheath layer, and enhancing the heat resistance effect.

5, the volume of the base layer 70a and the outer layer 70c is reduced while the water vapor (H ₂ O) generated by the decomposition of the metal hydroxide evaporates. Instead, the intermediate layer 70b expands, The structure of the high-resistance cable is not deformed and the original structure is maintained.

The metal hydroxide contained in the composite refractory layer 70 may be at least one selected from the group consisting of aluminum hydroxide, magnesium hydroxide, and silicon hydroxide.

The polymer binder occupies less than 10% by volume of the base layer (a) or outer layer (c) of the composite refractory layer 70 and is selected from the group consisting of stearic acid, stearate, benzonic acid, At least one selected from oleic acid, paraffin wax, carnauba wax and polyethylene wax.

The stearate may be selected from the group consisting of zinc stearate, calcium stearate, aluminum stearate, magnesium stearate, lead stearate, lithium stearate, stearate) and the like can be used.

The outer sheath layer 90 is a layer for physically and chemically protecting the inside of the cable, and contains a flame retardant of a halogen-free compound having flame-retardant characteristics. As such a flame retardant, it is possible to use, from the group consisting of chlorosulphonated polyethylene (CSP), polyvinyl chloride (PVC), polyethylene (PE), chloroprene rubber (CR), ethylene methacrylate (EMA) and ethylene vinyl acetate At least one selected is used.

As another embodiment of the high-refractory cable of the present invention, it may be constructed as shown in Fig. That is, the high-refractory cable of the present invention includes at least one conductor 110, a first refractory layer 120 surrounding the conductor, an insulation layer 130 surrounding the first refractory layer, a filler 140 A tape layer 150 surrounding the filler, a sheath layer 160 surrounding the tape layer, a base layer 170a of the complex refractory layer surrounding the sheath layer, and a middle layer of the refractory layer, which surrounds the base layer of the complex refractory layer. A second refractory layer 180 surrounding the outer layer of the complex refractory layer, and an outer sheath layer 170b surrounding the second refractory layer. The outer refractory layer 170b surrounds the intermediate refractory layer, 190).

6, the volume of the base layer 170a and the outer layer 170c of the complex refractory layer is reduced by the high-temperature flame, and the intermediate layer 170b expands to form the base layer 170a as shown in FIG. The intermediate layer 170b and the outer layer 170c are changed, the overall structure of the high-refractory cable is not deformed and the original structure is maintained.

[Example]

Hereinafter, the present invention will be described more specifically by way of examples. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims. It should not be construed as being intended to limit the scope of the embodiments below.

Example 1: Refractory characteristics (about 900 ° C) according to the composition of the compound refractory layer

Cables of Examples and Comparative Examples were fabricated in order to examine the fire resistance characteristics of the refractory layer of the present invention having the structure shown in Table 1 according to the composition of the refractory layer.

Cable structure Example Comparative Example 1 Comparative Example 2 Conductor Tinned copper The first refractory layer Mica tape Insulating layer Ethylene propylene rubber Tape layer PET Sheath layer CSP

complex
Refractory layer
Base layer Containing Aluminum Hydroxide and Polymer Binder
(2.0 mm)


Expanded polyethylene
(3.5 mm)


Silicone foam
(3.5 mm) Middle layer Expanded polyethylene
(2.0 mm)
Each layer Aluminum hydroxide and
Polymer binder content
(2.0 mm) External sheath layer CSP

The fire resistance characteristics of the cable having the structure shown in Table 1 were tested. The refractory characteristic test was carried out by raising the temperature of the chamber to about 900 DEG C according to the NEK 606 standard, and the results are shown in Table 2 below.

Fire resistance characteristics Example Comparative Example 1 Comparative Example 2 Energization time About 120 minutes About 34 minutes About 47 minutes

As summarized in Table 2, the high-refractory cable according to the embodiment of the present invention includes a composite refractory layer having excellent refractory characteristics, and the structure of the cable is not broken even at about 900 DEG C, so that the energization is maintained for about 120 minutes.

On the other hand, in the case of the cable of Comparative Example 1, the foamed polyethylene expanded due to the high temperature, the cable structure was broken, and the insulation effect was not effectively performed. In the case of the cable of Comparative Example 2, the silicone foam formed a charr due to the high temperature, but cracks were generated due to poor adhesive force between formed charrs. As a result, heat was transferred to the inside of the cable through the crack, and the energizing time of the cable of Comparative Example 2 was about 47 minutes.

Example 2: Refractory characteristics (about 1000 ° C) according to the composition of the complex refractory layer

The refractory characteristics were tested in the same manner as in Example 1, except that the temperature of the chamber was raised to about 1000 ° C according to the NEK 606 standard, and the results are shown in Table 3 below.

Fire resistance characteristics Example Comparative Example 1 Comparative Example 2 Energization time About 60 minutes About 11 minutes About 18 minutes

As summarized in Table 3, the high-refractory cable according to the embodiment of the present invention includes a complex refractory layer having excellent refractory characteristics, and the structure of the cable of about 1000 ° C is not broken and the energization is maintained for about 60 minutes.

On the other hand, the energization time of the cable of Comparative Example 1 was only about 11 minutes, and the energization time of the cable of Comparative Example 2 was only about 18 minutes. As the cable structure was destroyed in a shorter time by the temperature higher than that of Example 1, the energization time was also shorter than that of Example 1.

The reference numerals shown in the drawings of the present invention mean the following.
1, 10, 110: conductor 2: refractory layer
3, 30, 130: insulating layer 4, 40, 140: filler
5, 50, 150: tape layer 6: inner sheath layer
7: foamed polymer layer 9, 90, 190: outer sheath layer
20, 120: first refractory layer
60, 160: Sheath layer
70: Combined refractory layer
70a and 170a: the base layer of the complex refractory layer
70b and 170b: an intermediate layer of the complex refractory layer
70c and 170c: outer layers of the composite refractory layer
180: second refractory layer

Claims (12)

At least one conductor,
An insulating layer surrounding the conductor,
A sheath layer surrounding the insulating layer,
And a composite refractory layer surrounding the sheath layer,
Wherein the composite refractory layer is composed of a base layer composed of a metal hydroxide and a polymer binder, an intermediate layer surrounding the base layer and composed of a foamed polymer, and an outer layer surrounding the intermediate layer, the metal hydroxide and the polymer binder. The method according to claim 1,
Further comprising a first refractory layer surrounding the conductor and containing mica. 3. The method of claim 2,
And a second refractory layer surrounding the composite refractory layer and containing mica. The method according to claim 1,
A filler that surrounds the insulating layer,
Further comprising a tape layer surrounding the filler. The method according to claim 1,
And an outer sheath layer surrounding the composite refractory layer. The method according to claim 1,
Wherein the metal hydroxide is at least one selected from the group consisting of aluminum hydroxide, magnesium hydroxide, and silicon hydroxide. The method according to claim 1,
Wherein the metal hydroxide is decomposed into metal oxides and water vapor at a temperature of 200 DEG C or higher. The method according to claim 1,
Wherein the polymeric binder is decomposed at a temperature of 100 DEG C or higher. The method according to claim 1,
Wherein the polymeric binder is at least one selected from the group consisting of stearic acid, stearate, benzonic acid, oleic acid, paraffin wax, carnauba wax and polyethylene wax Highly refractory cables. 5. The method of claim 4,
Wherein the tape layer is made of one selected from the group consisting of polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), and nonwoven fabric. The method according to claim 1,
Wherein the foamed polymer is at least one selected from the group consisting of foamed polyolefin, foamed silicone and foamed polyurethane. The method according to claim 1,
Wherein the insulating layer is formed of at least one selected from the group consisting of a crosslinked polyethylene resin and an ethylene propylene rubber.

Images