KR930006208B1 - Flame-retardant cross-linked composition and flame-retardant cable using same - Google Patents

Abstract

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Description

Fire Retardant Cross-linking Compound And Fire Retardant Cable Using It

1 is a cross-sectional view of a flame retardant cable.

2 is a cross-sectional view of another embodiment of the cable of FIG.

3 is a cross-sectional view of another embodiment of the FIG. 1 cable.

* Explanation of symbols for main parts of the drawings

11 conductor 13 electric insulation

15: subcore 17: filter

19: carbonized tape layer 21: flame barrier layer

23: flame barrier layer 27: barrier protective layer

29: exterior

The present invention relates to a flame-retardant cable having a flame-retardant cross linking compound excellent in reduced flame transfer and heat resistance and an enclosure made from the compound.

Typical flame retardant resin compounds used for insulation and sheathing of electrical wires and cables, previously mixed with polyvinyl chloride as antiflame flame retardant, antimony trioxide, chloroprene rubber, chlorosulphurized polyethylene rubber, or polyethylene, ethylene It is known that such compounds are made by mixing vinyl acetate polymer, ethylene propylene rubber, etc. together with antimony trioxide, chlorine flame retardant or bromine flame retardant.

Because these compounds contain halogens in their base resins or flame retardants, these compounds contain toxic gases such as halogen compound gases (halogen chlorine gas, halogen bromine gas) and halogen gases (chlorine gas) at high temperatures in large quantities, including serious problems in a stable state. Calculate.

Such products using these compounds are not suitable for use where high stability is required, eg in subways, buildings, ships and nuclear plants. Moreover, there is an irrationality that the halogen gas and the halogen compound erode (corrode) adjacent conductors and the like.

In addition to flame retardants, crosslinks are made in base resins such as polyethylene and ethylene propylene rubber to improve the conventional flame retardant resin compounds in heat resistance. Chemical crosslinks and electron beam crosslinks are frequently used for such treatments. In chemical cross-linking, the compounds are heat treated by steam, other high temperature and high pressures, thus requiring special pressure-resistance vessels and heating devices. On the other hand, electron beam cross connection requires an electron beam emission chamber and a device.

Cross-linking also requires a rather large cross-linking device that greatly increases the cost of equipment and maintenance, increasing the cost of producing the compound.

Considering conventional cables, when internal structural members of a cable core, such as made of polyethylene and cross-linked polyethylene, are positioned to burn in the fire, they drip onto the surface of the cable, which vaporizes at high temperatures and immediately catches fire. It melts and flows into the drip so that the cable burns and burns bigger.

Moreover, cables with insulation and a sheath made of rubber or plastic free of halogen are no more than cables with such components using materials from halogens to halogen and halogen flame retardants.

In order to improve cables with such non-halogenated materials in flame retardants, large amounts of metallic hydroxides are mixed in them, but this is their material and reduces the power ratio.

In conventional chemical crosslinking by the use of such as peroxides, the material adjacent to the compound may be modified to crosslink because the crosslinking is performed at high temperature and high pressure.

For example, the inner core of the cable may be thermally deformed by cross connection of the sheath. On the other hand, it is difficult to reach the inside of the compound layer so that the electron beams cross each other in the electron beam cross connection.

For example, in a thick sheath, only its surface part is cross-connected. Electron beam crosslinking is absurd in that it is particularly difficult to completely crosslink a thick layer of compound.

Thus compounds such as flame retardant compounds that do not produce any toxic and corrosive gases when burned at high temperatures, for example in flames, by adding this stability and by eliminating the possibility of corrosion of adjacent metals by the produced gases. It is an object of the present invention to make a flame retardant cable using the same.

It is an object of the present invention to make a flame retardant cable using such a flame retardant crosslinking compound that is excellent in heat resistance and forms a good quality.

It is an object of the present invention to make a flame retardant cable using such a flame retardant crosslinking compound in which the crosslinking is carried out without any crosslinking device to reduce the production cost.

It is an object of the present invention to make a flame retardant cable having an excellent flame retardant structure. Considering these and other objects, according to one aspect of the present invention, a flame retardant crosslinking compound is prepared as follows. The first compound of the metallic hydrite and polyolefin resin free of any halogen is mixed with the silane-linked polyolefin free of any halogen to make the second compound.

The second compound is a crosslinked silane to make a flame retardant crosslinked compound.

The metallic hydroxide is mixed in an amount of about 50 to 100 parts by weight per about 100 parts by weight of both the polyolefin resin and the silane-linked polyolefin resin, and the polyolefin resin is mixed in an amount of about (100- ×) parts by weight. X is the amount of silane-bonded polyolefin resin and is 20≤x <80 by weight.

According to the present invention, the flame retardant crosslinked compound does not emit toxic gases such as hydrogen halogen compound gas or halogen gas, and has excellent flame resistance and heat resistance, and forms excellent quality, and furthermore, in comparison with the conventional compounds mentioned above, There is an advantage.

The flame retardant crosslinking compounds according to the invention are particularly useful for the insulation and insulation of such things as electrical wires, cables and the like.

And a flame retardant cable is made according to another cross section of the present invention; A core having at least one subcore, a subcore having an electrical conductor covered with an electrical insulation made of a material free from any halogen; A sheath made of a flame retardant crosslinking compound according to the first section of the invention.

In accordance with the present invention, a flame retardant cable can be made between the core and the sheath together with a flame barrier layer to increase the flame retardant in bonding with the action of the flame retardant crosslinking compound.

The polyolefin used in the present invention does not contain any halogen.

Examples include polyethylene, ethylene-alpha-olefin polymers, ethylene-propylene polymers, ethylene-vinyl acetate polymers, ethylene propylene diene elastomeric polymers (EPDM), ethylene-methyl acrylate polymers, polymethyl-acrylates, polyethyl acrylates, Polymethacrylates, ethylene acrylic elastomers, hydrogenated steren-butadiene rubbers and mixtures thereof can be used as polyolefins in the present invention.

As the metallic hydroxide, aluminum hydroxide, magnesium hydroxide, basic magnesium carbonate, calcium hydroxide surface-treated with a fatty acid or a hydroxide thereof, a phosphorus ester, a silane coupling agent, a titanate coupling agent and the like can be used in the present invention.

When mixed with polyolefin resins, these metallic hydroxides aid in delayed oxidation of the resin at high temperatures.

This flame retardant reaction occurs as follows. When the metallic hydroxide is heated at high temperatures, the crystal water separates and is released.

Resin mixed with metal hydroxides loses heat by separation of crystal water when heated at high temperatures due to fire or the like to cause the temperature to drop.

Even if the metal hydroxide is determined in accordance with the present invention in accordance with the present invention, even if the metal hydroxide is determined and blended with the resin together with the desired degree of the flame retardant, more preferably from about 50 to 200 parts by weight per 80 parts by weight of the olefin resin. Is generally used in amounts of 80 to 150 parts.

A sufficient amount of crystal water less than about 50 parts by weight of metallic hydroxide is released as a result of this insoluble flame. On the other hand, the quality of the cross-linking compound with a weight of about 200 parts by weight of the metallic hydroxide is bad.

The silane-linked polyolefins used in the present invention, for example, vinyl alcoholcysilanes such as vinyltriethoxsilane, gamma-methacryloxypropyl-trimethoxysilane and vinyltrimethoxysilane, are mentioned above. Resins which are bound together by the use of organic peroxides and which comprise a multipart olefin chain having silanol functional groups and which are rather excellent in combination with such polyolefin resins.

Silane-bonded polyolefin resins are easily crosslinked and the reaction is facilitated by moisture and catalysts that form a three-dimensional network structure. This silane crosslinking is condensation of the silanol moiety with dehydration, etc.

Silane-linked polyolefin resins according to the invention are generally used in amounts of about 20 to 80 parts by weight, where the amount of polyolefin as the base polymer is by weight (100- ×) parts and x is the silane-linked polyolefin used Is the amount.

The amount of silane-linked polyolefin depends on the desired degree of crosslinking.

The acceptability of any crosslinking cannot be obtained no more than about 20 parts by weight of the silane-bonded polyolefin resin and the finished production is poor in heat resistance.

By the weight of the silane-bonded polyolefin resin, the quality of forming the synthesis in the mixing and casting of about 80 parts or more is greatly degraded and the outer surface of the finished production is degraded. Rather, the amount of silane-linked polyolefin resin is about 20 to 50 parts by weight.

It is an important aspect of the present invention that in order to facilitate the process of the flame retardant crosslinking synthesis of the present invention, the polyolefin resin and the first compound having a metallic hydroxide and the silane-linked polyolefin resin are stored separately and contacted when a protruding structure is made.

After the silane-bonded polyolefin resin is mixed with the flame retardant compound, the crosslinks are brought into contact with external moisture, catalysts, etc., or the mixed compounds are passed under water so that the crosslinked structure is mainly silane-bonded by improving the product in thermal resistance. It is formed in the finished product together with the polyolefin resin.

Red fire retardants and / or carbon powders, such as carbon black and thermally expandable graphite, may be mixed with the flame retardant compound. When mixed in an appropriate amount, these materials promote the carbonization of the resin compound by high temperature heat to make the carbonized layer.

Therefore, the synthesis with reddish fire retardant and / or carbon powder in addition to metallic hydroxide prevents melting and dripping of the synthesis so that when the synthesis is heated at high temperatures, the burning area of the resin is avoided and at least reduced by promoting the flame retardant. .

The promotion of the carbonization of the compound by the red fire retardant is caused by the reaction of obtaining phosphorus hydrogen from the resin when the phosphorus is converted to phosphorus hydride by oxidation by high temperature heating, and thus the dropping of the resin dissolved by the solid carbide layer thus formed. It is caused by a reaction in which the carbon powder is avail- able to promote the carbonization of the resin during combustion by blocking.

The carbon powder is generally 10 parts by weight per 100 parts by weight of the weight of the olefin resin plus silane-linked polyolefin resin, that is, 100 parts by weight of the total amount of the polyolefin resin and the silane-linked polyolefin resin. It is used in 40 parts.

Promoting carbonization of the resin to less than 5 parts by weight of the carbohydrate powder is not sufficiently performed and therefore the dropping of the dissolved resin is not prevented. On the other hand, more than about 70 parts by weight of the synthetic vaginal formation is greatly reduced.

The red fire retardant used in the present invention may be a red fire or a fire retardant including red phosphorus, and in an amount of about 2 to 50 parts per 100 parts by weight of polyolefin resin plus silane-linked polyolefin resin, rather than about 10 to 30 parts It is required to include red phosphorus in the amount.

Outside a certain range, the fire retardant falls significantly in its ability to promote carbonization of the resin.

To make crosslinked composites according to the present invention for making electrical insulation materials, sheaths, etc. In the nitridation of the second compound, silane-linked polyolefin resins are separated and sealed with aluminum gold foil to prevent external moisture from entering. It is desirable to make it to be stored.

On the other hand, in making the first compound, the metallic hydroxide is added to the polyolefin resin and, if necessary, one of an antioxidant, a catalyst, a process aid, and a red fire retardant and a carbon powder is added to the polyolefin resin.

These materials are homogenously mixed by roller mills, Banbury mixer kneaders, etc. by producing fire-resistant compounds that are also sealed and stored.

These flame retardant compounds are formed in the desired form by conventional methods and are subjected to silane crosslinking, as described later.

There are three types of flame retardant multi-core cables described according to another aspect of the invention in figures 1 to 3, each of which is made of a flame retardant crosslinking compound according to the first aspect of the invention. Has

In the drawing, reference numeral 11 denotes a conductor, which is conventionally electrically insulated (13), for example polyethylene, cross-linked polyethylene (hereinafter referred to as XLPE) natural rubber, butyl rubber, silicone rubber, ethylene propylene rubber (EPR), Ethylene propylene diene elastomer, ethylene-vinyl acetate polymer, ethylene-methyl acrylate polymer, ethylene-alpha-olefin polymer, ethylene acrylic elastomer, hydrogenated steren-butadiine elastomer, mixtures thereof It is coated with electrical insulation made of the same thing.

Insulation can be made with a mixture of non-halogen flame retardant materials 13 by adding non-halogen flame retardant and the non-halogen flame retardant already mentioned.

The conductor 11 and the insulation 13 constitute an insulating subcore 15. Conventional chemical or electron beam crosslinking can be accommodated to crosslink polymethylene when insulation 13 is made of XLPE.

Dimethylyl peroxide (DCP), 2,5-dimethyl-2,5di (t-butylperoxine) hexane, cumenehydroferoxide, t-butylperoxypibarate and VTMS (vinyltrimethoxysilane) Organic silane coupling agents such as vinyltriethoxysilane, gamma-methacryloxypropyl trimethoxysilane, vinyltris (beta-methoxyethoxy) silane, gamma-methacryloxypropyl methyl dimethoxysilane Peroxides are used.

The insulation 13 may be formed according to the silane crosslinking of the flame retardant crosslinking compound of the present invention as described above.

The three subcores 15 are jute, paper, nonhygroscopic paper, flameproof paper, flameproof paper, polyethylene drawn yarn, flameproof poly to form the core. It is twisted together with the filter 17 having propylene (pp), polypropylene seal, tetron seal, polymethylene terephthalate film and the like.

Around the core is made of kraft paper, acrylic fiber cloth, rayon fabric, natural cellulose fibers, and these materials form a layer of carbonized tape that is infiltrated with silicone varnish, alkyd resin varnish, etc.

This carbonized tape can be wound around the core to form layer 19 and carbonized when heated. However, this carbide tape 19 can be omitted.

A flame barrier layer 21 or 23 is formed around the carbide tape 19 to create insulation 11 and filter 17 from fire.

In the cable of FIG. 1, the flame barrier layer 21 is formed by winding one or several pieces of a flame retardant non-organic tape with an overlap of 1 / 5-1 / 2 and the tape comprising something like ceramic. For example, it has a thickness of about 0.05-0.2 mm.

Flame retardant inorganic tapes include, for example, mica Mylar laminated tape, mica glass tape, mica-paper synthetic tape, asbestos tape, mica-paper laminated tape, silicone or alkylated resin varnish glass Tapes and composites of glass fibers and alumina-silica melt chamber tapes such as kaowool and ceramic fibers, alumina-glass-laminated tapes, and the like.

Instead, the flame barrier layer can be formed by winding one or several pieces of flame retardant tape, in which the oxygen resin is mainly made of 35 or more organic materials.

Such flame retardant tapes include, for example, flame retardant rubberized tapes and polyetheretherketones (PEEK), polyimide resins, polyethersulfenes, polyetherimidepolysulfones, polycarbonates, phenolic plastics or atactic polyesters It includes. When used, one to five pieces of such tape with a thickness of 0.05-0.2 mm are wound around the carbonized tape layer 19 with an overlap of 1/5 to 1/2.

In the cable of FIG. 2, the flame barrier layer 23 is formed by winding one or two pieces of metallic tape or one or a few pieces of metal tape in large portions with overlap of 1/5 to 1/2.

Such tapes have a thickness of, for example, about 0.03-0.2 mm and include such as copper, steel, stainless steel (SUS), brass, aluminum, aluminum-Mylar laminates, and the like. In the cable of FIG. 3, the flame barrier layers 21 and 23 are composed of an inorganic tape layer and a metallic tape layer generally used in the cables of FIG. 1 and FIG.

Each layer is formed by winding one or several tapes with overlap of 1/5 to 1/2. The inorganic tape layer is rather located inside the metal tape layer. However, the inorganic metallic tape may alternatively be wound around the carbonization layer 19.

It is necessary to form each of the carbide tape layers 19 and the barrier tape layers 21, 23 by winding the tape around the underlying layers in a redundant manner as described above.

In other windings, dissolved and vaporized combustibles can be ejected from the inside during the combustion of the cable. The barrier protective layer 27 forming such a flame barrier layer may be wound around the flame barrier layers 21 and 23 formed as described above.

The barrier protective layer 27 is formed by winding a synthetic tape such as, for example, aventos, glass, ceramic circuitry, such a material, or the like. Cross connect sheath 29 is also formed around barrier protection layer 27. Cross-linked sheath 29 is made of the flame retardant cross-linked compound already described according to the first aspect of the invention.

In the FIG. 1 cable, the flame barrier layer 21 is formed of an inorganic tape which comprises ceramic in large portions and is superior in its properties in thermal resistance. The layer 21 is not easily broken when heated in a fire so that the supply of air and the transfer of heat into the cable core is thereby effectively protected to adequately protect the core and to adequately carbonize the underlying carbonization layer 19.

Even though the insulation 13 of the cable core 15 melts due to an increase in temperature in the cable, the flame barrier layer 21 remains in the bond due to the interference of the carbonized tape layer 19 which is carbonized to form a biscuit wall type. This prevents the molten insulation 13 from flowing out of the cable.

The flame barrier layer 23 of the metallic tape, which is also excellent in thermal resistance in the cable of FIG. 2, is excellent in forming the quality in the flame barrier layer 21 and almost completely prevents the evaporation of the molten drips of insulation therethrough. The use of aluminum foil as flame barrier layer 23 is better in production cost.

In the double or multi-layer structure of the flame barrier layer comprising the inorganic layer 21 and the metallic tape layer 23 of FIG. 3, the combined effect of the inorganic and metallic layers is made and therefore an excellent effect is obtained.

The barrier protective layer 27 made around the flame barrier layer 21 or 23 mechanically protects and strengthens the latter against external forces. Due to its characteristics, the lower protective layer 27 in the thermal conductor provides thermal resistance to fire to the flame barrier layers 21, 23 by preventing or reducing the rise at the temperature of the sheath 29.

The sheath 29 is formed by mixing the silane-bonded polyolefin resin with the flame retardant compound made according to the first aspect of the invention and making each cable to push them around the barrier protective layer 27 in a conventional manner. The insulation 13 is formed in the same way.

Although the present invention is described with respect to a multicore cable, it can be applied to a single core cable.

In the above embodiment of the present invention is made of a carbonized layer, a barrier layer, a protective layer of a flame retardant cable. However, it is noted that even if such a collision is made necessary and the layers are omitted, a good flame retardant is obtained and no toxic gas is produced for some uses.

Example 1-6

In the synthesis of Table 1, the silane-linked polyolefin resins A and B were made separately according to the following procedure. In each procedure dicumyl ferroside (DCP) is dissolved in vinyltrimethoxysilane and high concentration polyethylene powder is added to it to form the compound in the form of a dough.

This dough is manufactured by Mitsui Petrochemical Ind.Ltd.Japan and mixed with each silane-bonded polyolefin resin A in homogeneous and rounded form with ethylene-alpha-olefin sold under the Japanese trademark "Tafmer A-4085" to form a mixture. By obtaining B, it was pushed out by a conventional extruder with a 40 mm diameter cylinder at an extrusion temperature of 200 ° C. in a batch of 4-5 minutes. The resins A and B thus made are stored sealed in an aluminum foil laminate bag with moisture and barrier on the surface.

TABLE 1

* Has a density of 0.95

Each batch is made for use in Examples 1-6 in the synthesis of Table 2 according to the following procedure.

Aluminum oxide magnesium oxide, red fire retardant, carbon black, stearic acid as a lubricant, conventional antioxidants, silane condensation catalysts and the like mixed with the ethylene-alpha-olefin polymers described above in connection with the silane-linked polyolefin resins A and B DCP was added according to the synthetic formulations in Table 2 to make each flame retardant compound (the first compound) in the form of a rounded mass.

The condensation catalyst was dibutyl tin dilaurate (DBTDL). This mixture is made by a Banbury mixer apparatus at 160 ° C. or higher.

The resulting flame retardant compounds were then stored in aluminum foil-laminated bags that each prevented entry of external moisture or the like.

Now the silane-linked polyolefin resins A and A thus made and the flame retardant compounds of Examples 1-6 are mixed according to the synthetic prescriptions in Table 2 to make a second compound, and the second compound is about 2.8 to 3 mm for each example. An insulated wire with a coating of thickness is made and pushed against a copper conductor having a diameter of 0.9 mm by a conventional extruder.

The insulated wires thus needed required thermal agitation tests and thermal strain tests to determine their properties.

In the thermal agitation test, each insulation wire was measured for tensile strength and extension after being allowed to withstand 7 days at 120 ° C or 2 days at 100 ° C.

In the thermal deformation test, the degree of thermal deformation of each insulated wire was measured according to IEC 92-3 with heat treatment at 90 ° C. for one hour with an applied load of 1 kg.

Oxygen index was measured according to ASTM D-2863 to test the flame resistance of the insulating tube of each example.

Halogen compounds were measured according to IEC-754 to test the toxic and corrosive gases produced.

TABLE 2

* 1 stearic acid treated surface

* 2 conventional fire retardants with 24% by weight of red phosphorus

* Antioxidant manufactured and marketed by Ciba-Geigy, Switzerland under the trade name "Irgranox # 1076".

* Dicumyl Peroxide to help four agonists

* 5 in accordance with IEC92-3 at 90 ° C with a load of 1 kg.

* 6 according to ASTM D-2863

* 7 Testing in accordance with IEC-754-1

* 8 × × × × × × × indicates that the quality is good and acceptable but not generally acceptable.

It will be noted that the results of this test are given in Table 2 and from which the insulated wires from Examples 1-4 within the preferred range of the present invention were excellent in casting and extension, pushing them to the insulated wires from Examples 5 and 6 before stirring.

Comparative Example 1-5

The use of the apparatus and procedure of Example 1-6 resulted in four types of insulated wires for Comparative Examples 1-4 according to the compounding regimen given in Table 3. The compounds of Comparative Examples 1 and 5 did not contain any silane-linked polyol peffin resins.

Another comparative wire for Comparative Example 5 was made in the same manner as in the previous example after the extrusion of the steam cross connection without the DCP. This insulated wire required the same test as Example 1-6. The results of the test are given in Table 3.

Comparative Example 1 and the crosslinking compound therefrom, where no crosslinking components were used and were used in one low metering of the scope of the present invention, were insoluble because they significantly deformed in the heat deformation test and melted or slightly melted in the stirring test.

It was also insoluble because cross-linking components were weak in forming the crosslinking compounds from Comparative Examples 3 and 4 where the high limiting amounts of the present invention were used.

The crosslinking compound from Comparative Example 5 where DCP was used for crosslinking showed acceptable results in all tests, but it required high temperature and high pressure equipment for crosslinking.

During the DCP cross connection of a cable sheath, its core is melted and attached together so that a cable using a DCP cross sheath has shrinkage in the material to be used for its core. The silane crosslinks employed in the present invention, on the other hand, do not require any crosslinking device and do not have such shrinkage in the material.

TABLE 3

Example 7-32 Insulation wires were made for each example according to the compounding regime given in Tables 4 and 5, where examples 7-10 and 20-23 suggested preferred compositions at different rates from extruding template.

Example 7-19 showed various bonds in the synthesis of aluminum oxide along with other fire retardants.

Examples 20-23 illustrate various bonds in the synthesis of magnesium oxide along with other fire retardants.

These insulated wires required testing as in Examples 1-6 of the results given in Tables 4 and 5.

Forming away before agitation test in crosslinked synthesis from Examples 7-10 and 20-23 as a rule for crosslinked synthesis from 11-13 and 24-26 in which silane-bound polyolefin resins were used in an amount exceeding the preferred range of the present invention. And inferior in kidney.

It is noted that the flame retardant compounds exceeded the preferred range of the present invention, resulting in poor casting of the extrudates from Examples 14 and 27 containing only metallic hydroxides with flame retardants. Such high condensation of metallic hydroxides can lead to heat generation in the extruder during extrusion, which in fact forms a finished product. It is appropriate to use metallic hydroxides in combination with carbon black and red flame retardants in appropriate amounts to obtain high flame retardants.

TABLE 4

TABLE 5

Example 33-54

For each example, as shown in Figs. 1-3, the following was made of a sample cable comprising three subcores each having a copper conductor of 5.5 mm 2 transverse strain. Insulation was pushed against each conductor and crosslinked with steam to form a subcore with a diameter of 5.0 mm.

In Examples 33-44 the insulation is made of XLPE and has a coating thickness of 1.0 mm and in Examples 45-54 the insulation is made of a non-halogen flame retardant crosslinking compound and has a coating thickness of 1.0 mm and the compound is an ethylene-alpha-olefin polymer ( Weight 100 parts), magnesium oxide (weight 80 parts), DCP (weight 2 parts) and antioxidant (weight 1 part).

The three subcores thus made are twisted in a conventional manner with a 90 μm thick kraft paper tape with a filter to form the core, and then, as shown in Table 6, the carbide tape and flame barrier layer in the following conventional manner. And barrier protection tape is wound around the core.

These carbonized tapes, flame barrier tapes and barrier protective tapes were wound in an overlapping manner.

Eventually, in Table 6, the sheath was pushed around the core so made at an extrusion temperature of 120-150 ° C. to create a cold watered and reel wound cable. These samples required the IEEE standard 383 test (vertical tray flame test).

The test also measured the distance seen through the condensation of halogen gas produced by the test and the resulting smoke. The results of the vertical tray flame test are given in Table 7 and it is noted that the results of all examples were acceptable.

It is noted from Example 33-54 that the halogen compound gas condensation is 0PPM and the distance seen through the smoke produced is more than 100m. From these results it is clear that cables falling within the scope of the invention during combustion produce small amounts of smoke and do not produce halogenated gases and they have sufficient flame resistance.

It is noted that no other toxic or corrosive gases were produced.

Comparative Example 6

For comparison purposes, a sample cable was made in the following way. A PVC resin has conventionally been pushed against a copper conductor of 5.5 mm2 cross-sectional area to form a subcore with 1.0 mm coating thickness and 5.0 mm diameter. The three subcores were then twisted in a conventional manner with a jute with a wheeler to form the core and pushed around to create a cable with a 1.5 mm sheath of flame-resistant PVC around.

This sample required the same test as in Example 33-54. It was noted that the distance seen by the vertical tray flame test was 1m and the cable produced a much larger amount of smoke than the cables of 33-54.

It was also noted that halogenated gases were made in amounts of 530 PPM beyond the level (LEVEL), which is harmful to humans and would corrode adjacent devices such as electrical contacts.

TABLE 6

* One-piece mica-glass tape 0.13 mm thick with 9 1/4 overlap

* A flame retardant crosslinking compound made in Example 3 and having a thickness of 1.5 mm

* A sheet of kraft paper, 90 µm thick, wound with 11 1/3 overlap

* 0.13mm thick one piece glass tape with 12 1/4 overlap

* 50μm thick one-piece aluminum Mylar laminated tape wound with 13 1/4 overlap

* Fire cross-linking synthesis with 1.5 mm thickness used in Example 14

* Flame cross-linking synthesis, used in Example 31 and 1.5 mm thick.

* 16 flame retardant PVC and 1.5㎜ thick

* Flame cross-linking synthesis, used in Example 27 and with a thickness of 1.5 mm

* Flame cross-linking synthesis with 1.5 mm thickness used in Example 10

[Example 55-62 and Comparative Example 7-9]

The use of the instruments and procedures in Examples 1-6 resulted in the manufacture of a flame retardant for each example in the synthetic regimen given in Table 8. This synthesis was measured by oxygen index and thermal strain.

The results are also given in Table 8.

TABLE 8

* Conventional fire retardants comprising 20% of the weight of 19 red phosphorus

* 20 DBTDL Catalyst

Example 63-71

For each example a sample cable was made in substantially the same way as in Examples 33-44.

That is, made by using the same method and materials as in Examples 33-44, and then, as shown in Table 9, the carbonized tape, the flame bayer tape and the bearer protective layer tape were wound around the core by conventional methods.

Flame-retardant tapes were made of used organic materials with an oxygen index of 35 or more, such as flame-beary tapes that formed all or part of each flame barrier layer.

This sample cable required the same test as Example 33-44 and the results are given in Table 10.

As shown in Table 10, cables falling within the scope of the present invention produced less smoke and did not produce toxic and corrosive gases such as hydrogen chloride gas.

The cable also offered enough flame retardancy and the exterior was excellent in proportion.

TABLE 9

* 22 0.5mm thick and 52 oxygen index

TABLE 10

Claims (19)

The metal hydrate to which the polyolefin which the silane which comprises the 1st compound and the 2nd compound of a polyolefin resin was added, the halogen-free resin mixed, the secondary compound which silane was crosslinked, and a metal hydrate is a polyolefin The combined polyolefin resin of the resin and the silane is mixed in an amount of about 50 parts by weight to about 200 parts by weight of 100 parts each, and the polyolefin resin is the weight of the polyolefin resin in which " X " A flame retardant crosslinking compound, characterized in that it is an amount of 80 parts and mixed by weight in an amount of about "100-X". The method according to claim 1, wherein in the flame retardant crosslinked composite, the first compound comprises about 5 to 70 parts by weight of 100 parts by weight of each of the polyolefin resins in which the polyolefin resin and the silane are combined, and the carbon content by weight. Flame crosslinking compound. The flame retardant crosslinking compound according to claim 2, wherein the first compound comprises about 2 parts to 50 parts by weight of the polyolefin resin in which the polyolefin resin and the silane are bonded to 100 parts by weight of red, respectively. The polyolefin resin according to claim 1, 2 or 3, wherein the polyolefin resin is polyethylene, ethylene-alpha-olefin polymer, ethylene-propylene polymer, ethylene-vinyl acetate polymer, ethylene propylene diene elastomer, ethylene-methyl acrylate polymer, polymethyl A flame retardant crosslinking compound, characterized in that the resin is selected from a group consisting of acrylates, polyethylacrylates, polymethacrylates, elastomers of ethylene acrylics, hydrogenated steren-butadiine rubbers and mixtures thereof. 5. The flame retardant crosslinking compound according to claim 4, wherein the metallic hydroxide is a material selected from a group consisting of aluminum oxide, magnesium oxide, calcium oxide and basic magnesium carbonate. 6. The flame retardant crosslinking compound according to claim 5, wherein the metallic hydroxide is a surface treated with one of a fatty acid, an ester comprising phosphorus, a silane coupling agent and a titanate coupling agent. Consists of one sub-core or one or more sub-cores wound together with an electrical insulation made of a material free of any halogen, a sheath made of a flame-retardant cross-linking compound produced and produced for the core, free of any halogen The first compound of the polyolefin resin, which is a resin, and the metal hydroxide, is mixed to form the second compound, and is composed of a silane crosslinking second compound for forming a flame retardant crosslinking compound, wherein the metal hydroxide is composed of a polyolefin resin and a silane-linked polyolefin resin. And the polyolefin resin is mixed in an amount of about (100-X) parts by weight per 100 parts by weight of the polyolefin resin, where X is the amount of the silane-linked polyolefin resin and is 20≤X≤ about 80 by weight. Flame-proof cable characterized in that the. 8. The flame retardant cable according to claim 7, comprising a first compound comprising about 5 to 70 parts of carbon powder per 100 parts by weight of polyolefin resin and silane-linked polyolefin resin. The flame retardant cable according to claim 8, wherein the first compound comprises a red flame retardant having red phosphorus in an amount of about 2 to 50 parts by weight per 10 parts by weight of the polyolefin resin and the silane-linked polyolefin resin. 10. The flame retardant cable according to claim 7, 8 or 9, wherein a barrier layer formed of a piece of non-flammable tape wound around the ko in an overlapping manner is located between the core and the sheath. 11. The flame retardant cable according to claim 10, wherein the flame barrier layer is formed of a flame retardant tape made of an organic material having an oxygen index of 35 or 2 or more. 11. The flame retardant cable of claim 10 wherein the non-combustible tape is one of an inorganic tape and a metallic tape comprising a large portion of ceramic and comprising a two-layered composite of metallic tape and organic tape. 13. The organic tape of claim 12, wherein the inorganic tape is a mica polyester laminating tape, mica polyester laminating, tape mica glass tape, mica-paper synthetic tape, mica-paper laminating tape, asbestos tape , Silane-applied glass tape, alkylated resin varnish-applied glass tape, alumina melt-spun tape, silica melt-spun tape, synthetic tape of alumina melt-spun fiber and glass fiber, two layers of silica melt-spun fiber and glass fiber A flame retardant cable characterized by one of synthetic tape and alumina-glass laminating tape. 12. The flame retardant cable of claim 10, wherein the flame cable is positioned between the core of the carbonized tape layer and the flame barrier layer formed by winding a tape that is susceptible to carbonization around the core when the cable is susceptible to high temperatures. 15. The flame retardant cable according to claim 14, wherein the carbonized tape is made from a material selected from these materials contained in kraft paper, acrylic fiber cloth, rayon cloth, natural cellulose fiber and silicone varnish or alkylated resin varnish. . 15. The barrier protection layer according to claim 14, comprising a barrier protection layer positioned between the flame barrier layer and the exterior to mechanically and thermally protect the barrier protection layer formed by winding at least one piece of tape made of asbestos, glass or ceramic fibers. Flame-proof cable made. 11. The barrier protection layer of claim 10, wherein the barrier protection layer is formed by winding at least one piece of tape made of asbestos, glass, or ceramic fibers between the flame barrier layer and the sheath to mechanically and thermally protect the flame barrier layer. Fire-resistant cable, characterized in that located. 10. The flame retardant cable according to claim 7, 8 or 9, wherein the metallic hydroxide is a material selected from aluminum oxide, magnesium oxide, calcium oxide and basic magnesium carbonate. 19. The flame retardant cable of claim 18, wherein the metallic hydroxide is a surface treated with a fatty acid, an ester comprising phosphorus, a silane coupling agent and a titanate coupling agent.

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