JP2002237223A - Flame resistant and abrasion resistant electric wire/ cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flame resistant and abrasion resistant electric wire/cable having flame resistance and improving abrasion resistance. SOLUTION: This flame resistant and abrasion resistant electric wire 5 is obtained by forming on a conductor 1 a first insulating layer 3 obtained by mixing 100 pts.wt. polyolefinic resin with 40 to 200 pts.wt metal hydroxide, and on a first insulating layer 3 a second insulating layer 4 obtained by mixing 100 pts.wt. polyolefinic resin with 40 to 200 pts.wt metal hydroxide, and 1 to 10 pts.wt. dimethyl silicone.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame-retardant and abrasion-resistant electric wire and cable having excellent flame-retardancy and wear resistance.

[0002]

2. Description of the Related Art Conventionally, polyvinyl chloride resin having excellent flame retardancy has been used alone as an insulator or a sheath of electric wires and cables. However, since polyvinyl chloride generates a halogen gas when burned, a polyolefin resin represented by polyethylene or a copolymer of ethylene is used as an insulator or sheath that does not generate a halogen gas when burned. . Since this polyolefin-based resin alone does not have flame retardancy, it is imparted with flame retardancy by blending a metal hydroxide such as magnesium hydroxide. The metal hydroxide such as magnesium hydroxide has a property that the flame retardancy is improved as the blending amount is increased. The flame retardancy due to the compounding of a metal hydroxide such as magnesium hydroxide is due to the fact that after the polyolefin-based resin is burned, the water of crystallization contained in the compounded metal hydroxide gushes out to extinguish the fire. it is conceivable that.

[0003]

However, the more the metal hydroxide such as magnesium hydroxide is added to the polyolefin resin, the more the surface smoothness of the wire / cable is reduced and the wear resistance is reduced. Would. Therefore, in order to suppress a decrease in wear resistance, the amount of the metal hydroxide to be compounded must be reduced. However,
If the compounding amount of the metal hydroxide is reduced, desired flame retardancy (for example, flame retardancy equivalent to the flame retardancy of polyvinyl chloride resin) cannot be obtained.

An object of the present invention is to provide a flame-retardant wear-resistant electric wire / cable having flame retardancy and improved wear resistance.

[0005]

According to a first aspect of the present invention, there is provided a flame-retardant and abrasion-resistant electric wire in which a metal hydroxide and silicon are mixed with a polyolefin resin on a conductor. Formed on the insulating layer. With this configuration, according to the flame-retardant abrasion-resistant wire according to the first aspect, sufficient flame retardancy can be obtained, and the surface smoothness of the wire is improved by silicon compounded in the insulator layer. Therefore, wear resistance is improved.

In order to achieve the above object, the flame-retardant abrasion-resistant electric wire according to claim 2 comprises a plurality of insulating layers formed by mixing a metal hydroxide with a polyolefin resin on a conductor. It is characterized in that silicon is compounded in the outermost layer among the insulator layers formed separately and in the plurality of layers. With such a configuration, a second aspect is provided.
According to the flame-resistant and abrasion-resistant wire described in the above, sufficient flame-retardancy can be obtained, and the abrasion resistance of the wire surface is improved by the silicon compounded in the outermost layer of the insulator layer. improves. Further, since silicon is compounded only in the outermost layer among the insulator layers formed in a plurality of layers, the manufacturing cost can be reduced.

In order to achieve the above object, a flame-retardant abrasion-resistant electric wire according to a third aspect of the present invention provides a flame-retardant abrasion-resistant electric wire, in which a metal hydroxide is added on a conductor in an amount of 40 to 200 parts by weight per 100 parts by weight of a polyolefin resin.
Parts by weight, and an insulator layer formed by mixing 1 to 10 parts by weight of silicon. Here, the metal hydroxide is added in an amount of 40 to 20 with respect to 100 parts by weight of the polyolefin resin.
When the amount of metal hydroxide is less than 40 parts by weight, sufficient flame retardancy cannot be obtained when the amount is less than 40 parts by weight. On the other hand, when the amount exceeds 200 parts by weight, mechanical strength such as abrasion resistance is sufficient. Is no longer available. Further, the reason why silicon is used in an amount of 1 to 10 parts by weight with respect to 100 parts by weight of the polyolefin resin is that when the silicon is less than 1 part by weight, sufficient smoothness of the wire surface cannot be obtained. If the amount exceeds the weight part, even if silicon is further added, there is not much change in the lubrication point, and the production cost of the flame-resistant and abrasion-resistant electric wire only increases. With this configuration, according to the flame-retardant wear-resistant wire according to claim 3, sufficient flame retardancy can be obtained, and
The silicon blended in the insulator layer improves the smoothness of the surface of the electric wire, thereby improving the wear resistance. Further, by determining the lower limit of the mixing range of the metal hydroxide, sufficient flame retardancy is secured. Furthermore, from the upper limit of the compounding range of the metal hydroxide, it is not necessary to add a large amount of the metal hydroxide to the insulator layer, and it is possible to sufficiently secure mechanical properties such as abrasion resistance. Further, by determining the lower limit of the compounding range of silicon, sufficient surface lubrication can be ensured. Further, it is not necessary to mix a large amount of silicon from the upper limit of the mixing range of silicon, so that the manufacturing cost can be reduced.

In order to achieve the above object, a flame-resistant and abrasion-resistant electric wire according to claim 4 is characterized in that a metal hydroxide is added on a conductor in an amount of 40 to 200 parts by weight per 100 parts by weight of a polyolefin resin.
Insulation layer composed of parts by weight is divided into multiple layers and formed,
The outermost layer of the plurality of insulator layers is formed by mixing 1 to 10 parts by weight of silicon with respect to 100 parts by weight of the polyolefin resin. Here, the reason why the metal hydroxide was set to 40 to 200 parts by weight based on 100 parts by weight of the polyolefin resin,
If the metal hydroxide is less than 40 parts by weight, sufficient flame retardancy cannot be obtained, while if it exceeds 200 parts by weight, sufficient mechanical strength such as abrasion resistance cannot be obtained. is there. Further, the reason why silicon is used in an amount of 1 to 10 parts by weight with respect to 100 parts by weight of the polyolefin resin is that when the silicon is less than 1 part by weight, sufficient smoothness of the wire surface cannot be obtained. If the amount exceeds the weight part, even if silicon is further added, there is not much change in the lubrication point, and the production cost of the flame-resistant and abrasion-resistant electric wire only increases. According to the above construction, the flame-retardant abrasion-resistant wire according to claim 4 can obtain sufficient flame-retardancy, and the surface of the wire is made of silicon compounded in the outermost layer of the insulator layer. The abrasion resistance is improved because the lubricity of the rubber is improved. Further, since silicon is compounded only in the outermost layer of the insulator layers formed in a plurality of layers, the manufacturing cost can be reduced. Further, by determining the lower limit of the mixing range of the metal hydroxide, sufficient flame retardancy is secured. Furthermore, from the upper limit of the compounding range of the metal hydroxide, it is not necessary to add a large amount of the metal hydroxide to the insulator layer, and mechanical properties such as abrasion resistance can be sufficiently secured. Further, by determining the lower limit of the silicon compounding range, sufficient surface lubrication can be ensured. further,
There is no need to blend a large amount of silicon from the upper limit of the blending range of silicon, and manufacturing costs can be reduced.

In order to achieve the above object, a flame-resistant and abrasion-resistant electric wire according to claim 5 is characterized in that the silicon is dimethyl silicon. With this configuration, the flame-retardant abrasion-resistant electric wire according to claim 5 can obtain sufficient flame retardancy, and the dimethyl silicon improves the surface smoothness of the electric wire, so that the abrasion resistance is improved. improves.

In order to achieve the above object, a flame-retardant wear-resistant cable according to claim 6 is formed by coating an insulator made of a polyolefin resin and a metal hydroxide on a conductor. And two or more insulated wire cores, or a plurality of such insulated wire cores formed by interposing inclusions, and a metal hydroxide and silicon mixed with a polyolefin resin. The sheath is covered. With this configuration, the flame-retardant abrasion-resistant cable according to claim 6 can obtain sufficient flame retardancy, and the silicone blended in the sheath improves the lubricity of the cable surface. Abrasion is improved.

In order to achieve the above object, a flame-retardant abrasion-resistant cable according to claim 7 is characterized in that a metal hydroxide is contained on a conductor in an amount of 40 to 20 parts by weight per 100 parts by weight of a polyolefin resin.
0 parts by weight of an insulating core coated with an insulator, two insulated cores are combined, or a plurality of such insulated cores are formed by interposing inclusions, and then polyolefin-based. 40-200 metal hydroxide per 100 parts by weight of resin
The sheath is formed by mixing 1 to 10 parts by weight of silicon and 1 to 10 parts by weight of silicon. Here, the metal hydroxide is added in an amount of 40 to 100 parts by weight of the polyolefin resin.
When the amount is 200 parts by weight, sufficient flame retardancy cannot be obtained when the amount of the metal hydroxide is less than 40 parts by weight.
If the amount exceeds the weight part, sufficient mechanical strength such as abrasion resistance cannot be obtained. Also, the reason why silicon is used in an amount of 1 to 10 parts by weight with respect to 100 parts by weight of the polyolefin resin is that when the silicon is less than 1 part by weight, sufficient lubricity of the cable surface cannot be obtained.
If the amount exceeds 10 parts by weight, even if silicon is added more than that, there is not much change in the lubricity, and the production cost of the flame-resistant and abrasion-resistant cable only increases. With this configuration, the flame-retardant abrasion-resistant cable according to claim 7 has sufficient flame retardancy, and the silicone blended in the sheath improves the lubricity of the cable surface, so that the abrasion resistance is improved. The performance is improved. Further, since silicon is compounded only in the sheath, the manufacturing cost can be reduced. Further, by determining the lower limit of the mixing range of the metal hydroxide, sufficient flame retardancy is secured. Furthermore, from the upper limit of the compounding range of the metal hydroxide, it is not necessary to add a large amount of the metal hydroxide to the sheath, and mechanical properties such as abrasion resistance can be sufficiently ensured. Further, by determining the lower limit of the silicon compounding range, sufficient surface lubrication can be ensured. Further, it is not necessary to mix a large amount of silicon from the upper limit of the mixing range of silicon, so that the manufacturing cost can be reduced.

In order to achieve the above object, a flame-retardant wear-resistant cable according to claim 8 is characterized in that the silicon is dimethyl silicon. According to the flame-retardant abrasion-resistant cable according to the eighth aspect of the present invention, sufficient flame retardancy can be obtained, and the surface of the cable is improved in lubricity by the dimethyl silicone compounded in the sheath. The wear resistance is improved.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a flame-retardant wear-resistant wire / cable according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing one embodiment of the flame-retardant wear-resistant electric wire according to the present invention. In the figure, 1
Is a conductor, and an insulator layer 2 is formed on the conductor 1 to constitute a flame-resistant and wear-resistant electric wire 5. Insulator layer 2
Is composed of a first insulator layer 3 and a second insulator layer 4. The conductor 1 is covered with the first insulator layer 3, and the second insulator layer 3 is formed on the first insulator layer 3. Insulator layer 4 is covered.
The second insulator layer 4 forms the outermost insulator layer.

The first insulator layer 3 is composed of 40 to 200 metal hydroxides per 100 parts by weight of the polyolefin resin.
It is formed by blending parts by weight. The second insulator layer 4 is formed by mixing 40 to 200 parts by weight of a metal hydroxide and 1 to 10 parts by weight of dimethyl silicon with respect to 100 parts by weight of a polyolefin resin. Note that the first insulator layer 3 and the second insulator layer 4 may be added with a flame retardant aid and a lubricant as needed. Further, a crosslinking agent may be added to impart crosslinkability.

The reason why the metal hydroxide is used in an amount of 40 to 200 parts by weight with respect to 100 parts by weight of the polyolefin resin is that sufficient flame retardancy can be obtained when the metal hydroxide is less than 40 parts by weight. On the other hand, if it exceeds 200 parts by weight, sufficient mechanical strength such as abrasion resistance cannot be obtained. Also, the reason why dimethyl silicon is used in an amount of 1 to 10 parts by weight with respect to 100 parts by weight of the polyolefin resin is that when the amount of dimethyl silicon is less than 1 part by weight, sufficient smoothness of the electric wire surface cannot be obtained. If the amount exceeds 10 parts by weight, even if dimethyl silicon is added more than that, there is not much change in the lubricity, and the production cost of the flame-resistant and abrasion-resistant electric wire 5 only increases.

The polyolefin resins include ethylene-ethyl acrylate copolymer (EEA), ethylene-vinyl acetate copolymer (EVA), and polyethylene (P
E) and the like. Examples of the metal hydroxide include magnesium hydroxide and aluminum hydroxide.

In the present embodiment, dimethyl silicon is compounded in the second insulator layer 4, but by mixing it with a polyolefin resin containing a metal hydroxide, the lubricity of the electric wire surface can be reduced. It only needs to be silicon that can be obtained, and is not limited to dimethyl silicon.

The flame-resistant and abrasion-resistant wire 5 according to the present embodiment configured as described above can obtain sufficient flame-retardancy, and can be made of dimethyl silicon compounded in the second insulator layer 4. Since the smoothness of the surface of the electric wire is improved, the wear resistance is improved. Further, since dimethyl silicon is blended only in the second insulator layer 4, the manufacturing cost can be reduced. Further, by determining the lower limit of the mixing range of the metal hydroxide, sufficient flame retardancy is secured. Further, from the upper limit of the compounding range of the metal hydroxide, it is not necessary to add a large amount of the metal hydroxide to the insulator layer 2, and mechanical properties such as abrasion resistance can be sufficiently secured. Further, by determining the lower limit of the mixing range of dimethyl silicon, it is possible to ensure sufficient lubricity on the surface of the electric wire. Further, it is not necessary to mix a large amount of dimethyl silicon from the upper limit of the mixing range of dimethyl silicon, and the manufacturing cost can be reduced.

FIG. 2 is a sectional view showing an embodiment of the flame-retardant wear-resistant cable according to the present invention. In the figure,
Reference numeral 10 denotes a conductor. An insulator 11 is coated on the conductor 10, and an insulated wire core 12 is formed. Two insulated wire cores 12 are combined, and a sheath 13 is coated thereon to form a flame-retardant and abrasion-resistant cable 14.

The insulator 11 is made of a polyolefin resin 10
It is formed by mixing 40 to 200 parts by weight of a metal hydroxide with respect to 0 parts by weight. In addition, if necessary, a flame retardant aid,
A lubricant may be added. Further, a crosslinking agent may be added to impart crosslinkability.

The sheath 13 is made of a polyolefin resin 10
40 to 200 parts by weight of metal hydroxide based on 0 parts by weight,
It is formed by mixing 1 to 10 parts by weight of dimethyl silicon. In addition, you may add a flame-retardant auxiliary agent and a lubricant as needed. Further, a crosslinking agent may be added to impart crosslinkability.

The reason why the metal hydroxide is used in an amount of 40 to 200 parts by weight with respect to 100 parts by weight of the polyolefin resin is that sufficient flame retardancy can be obtained when the metal hydroxide is less than 40 parts by weight. On the other hand, if it exceeds 200 parts by weight, sufficient mechanical strength such as abrasion resistance cannot be obtained. In addition, the reason why dimethyl silicon is used in an amount of 1 to 10 parts by weight based on 100 parts by weight of the polyolefin resin is that when the amount of dimethyl silicon is less than 1 part by weight, sufficient smoothness of the cable surface cannot be obtained. , 10
If the amount exceeds the weight part, even if dimethyl silicon is further added, there is not much change in the lubrication point, and the manufacturing cost of the flame-resistant and wear-resistant cable 14 only increases.

Examples of the polyolefin resin include ethylene-ethyl acrylate copolymer (EEA), ethylene-vinyl acetate copolymer (EVA), and polyethylene (P
E) and the like. Examples of the metal hydroxide include magnesium hydroxide and aluminum hydroxide. Further, in the present embodiment, dimethyl silicon is compounded in the sheath 13, but any silicon can be used as long as it can obtain the smoothness of the cable surface by being mixed with a polyolefin resin mixed with a metal hydroxide. However, it is not limited to dimethyl silicon.

The flame-resistant and abrasion-resistant cable 14 according to the present embodiment configured as described above can obtain sufficient flame-retardancy, and the surface of the cable can be smoothed by dimethyl silicone mixed in the sheath 13. The abrasion resistance is improved because the property is improved. Furthermore, since dimethyl silicon is blended only in the sheath 13, the manufacturing cost can be reduced. Further, by determining the lower limit of the mixing range of the metal hydroxide, sufficient flame retardancy is secured. Furthermore, from the upper limit of the compounding range of the metal hydroxide, it is not necessary to add a large amount of the metal hydroxide to the sheath 13, and mechanical properties such as abrasion resistance can be sufficiently ensured. Further, by determining the lower limit of the mixing range of dimethyl silicon, sufficient surface lubrication can be ensured. Further, it is not necessary to mix a large amount of dimethyl silicon from the upper limit of the mixing range of dimethyl silicon, and the manufacturing cost can be reduced.

In this embodiment, the flame-resistant and abrasion-resistant cable 14 is formed by combining two insulated wires 12 and covering the sheath 13. The abradable cable is not limited to such a cable, but may be formed by twisting a plurality of insulated wire cores with an intervening inclusion formed thereon and covering with a sheath.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Specific examples of the cable will be described below in comparison with a comparative example.

Example 1 In Example 1, the composition constituting the second insulating layer 4 or the sheath 13 was prepared by using EEA as a polyolefin resin (specifically, A-110 manufactured by Japan Polyolefin Co., Ltd.).
0) 40 parts by weight of magnesium hydroxide as a metal hydroxide (specifically, Kisuma 5A manufactured by Kyowa Chemical Industry Co., Ltd.) and silicon (specifically, 100 parts by weight)
BY1 manufactured by Toray Dow Corning Silicone Co., Ltd.
6-140) and 1 part by weight of an antioxidant (specifically, IRGAN manufactured by Ciba Specialty Chemicals Co., Ltd.)
OX1010) in an amount of 1 part by weight.

Example 2 In Example 2, the composition constituting the second insulating layer 4 or the sheath 13 was converted to EEA as a polyolefin resin (specifically, A-110 manufactured by Japan Polyolefin Co., Ltd.).
0) 200 parts by weight of magnesium hydroxide as a metal hydroxide (specifically, Kisuma 5A manufactured by Kyowa Chemical Industry Co., Ltd.) and silicon (specifically, Dow Corning Toray Co., Ltd.) Silicone Co. B
Y16-140) and 10 parts by weight of an antioxidant (specifically, IR manufactured by Ciba Specialty Chemicals Co., Ltd.)
Ganox 1010) in an amount of 1 part by weight.

Example 3 In Example 3, the composition constituting the second insulating layer 4 or the sheath 13 was prepared by using EEA as a polyolefin resin (specifically, A-110 manufactured by Japan Polyolefin Co., Ltd.).
0) 100 parts by weight of magnesium hydroxide as a metal hydroxide (specifically, Kisuma 5A manufactured by Kyowa Chemical Industry Co., Ltd.) and 100 parts by weight of silicon (specifically, Dow Corning Toray Co., Ltd.) Silicone Co. B
Y16-140) and 4 parts by weight of an antioxidant (specifically, IR manufactured by Ciba Specialty Chemicals Co., Ltd.)
Ganox 1010) in an amount of 1 part by weight.

Comparative Example 1 In Comparative Example 1, the composition constituting the second insulating layer or the sheath was prepared by using EEA (specifically, A-1100 manufactured by Japan Polyolefin Co., Ltd.) 1 as a polyolefin resin.
40 parts by weight of magnesium hydroxide as a metal hydroxide (specifically, Kisuma 5A manufactured by Kyowa Chemical Industry Co., Ltd.) and an antioxidant (specifically, Ciba Specialty Chemicals Co., Ltd.) IRGANO made by company
X1010) in an amount of 1 part by weight.

Comparative Example 2 In Comparative Example 2, a composition constituting the second insulating layer or the sheath was prepared by using EEA (specifically, A-1100 manufactured by Japan Polyolefin Co., Ltd.) 1 as a polyolefin resin.
The silicone (specifically, BY16-14 manufactured by Dow Corning Toray Silicone Co., Ltd.)
0) and 1 part by weight of an antioxidant (specifically, IRGANOX10 manufactured by Ciba Specialty Chemicals Co., Ltd.)
10) and 1 part by weight.

The oxygen index and the abrasion resistance of each of Examples 1 to 3 and Comparative Examples 1 and 2 were compared. Table 1 shows the results of the comparison.

[0033]

[Table 1] The oxygen index in Table 1 is based on Japanese Industrial Standard JISK720.
The test was carried out in accordance with the combustion test method for polymer materials by the oxygen index method of No. 1. The oxygen index as used herein refers to a value of a minimum oxygen concentration expressed as a percentage by volume in oxygen required for a material to sustain combustion under a predetermined test condition. The target value of the oxygen index is 22 or more. The reason why the target value of the oxygen index is set to 22 or more is that if the target value of the oxygen index is lower than 22, the flame retardancy is not as high as that of polyvinyl chloride.

The abrasion resistance test shown in Table 1 was carried out in such a manner that the compositions formed on the basis of the compositions of Examples 1 to 3, Comparative Example 1 and Comparative Example 2 were formed into a 0.5 mm sheet, and the sheet was used as a sheet. The measurement is carried out by reciprocating 500 times with a load of 2 kg on a taper wear tester. When the sheet did not penetrate at that time, "pass" was evaluated, and when the sheet penetrated, "fail" was evaluated.

Next, the results of tests performed on compositions formed with the component compositions shown in Table 1 will be discussed.
First, as for the oxygen index indicating the flame retardancy, Example 1 satisfies the target value "22", which is "23", Example 2 is "30", and Example 3 is "26". In the test for abrasion resistance, all of Examples 1, 2 and 3 are "Passed". As described above, all of Example 1, Example 2, and Example 3 were able to obtain favorable results regarding the oxygen index indicating flame retardancy and the abrasion resistance.

On the other hand, the comparative example shows that the comparative example 1
Does not contain any silicon. For this reason, the test for abrasion resistance was “failed”. The oxygen index is also “21”, which is the target value “2”.
2 ”or more are not satisfied. In Comparative Example 2, silicon was blended, but magnesium hydroxide as a metal hydroxide was not blended at all. For this reason, the test for abrasion resistance was "passed", but the oxygen index indicating flame retardancy was "17", and the target value of "2"
2 ”or more are not satisfied. In summary, Example 1
-Example 3 could obtain good results for the oxygen index and abrasion resistance, but Comparative Examples 1 and 2 could not obtain good results for the oxygen index and the abrasion resistance. .

[0037]

Since the present invention is configured as described above, it has the following effects.

According to the first aspect of the present invention, sufficient flame retardancy can be obtained, and the silicon blended in the insulating layer improves the smoothness of the surface of the electric wire, thereby improving the wear resistance. Can be.

According to the second aspect of the present invention, sufficient flame retardancy can be obtained, and the surface of the electric wire can be improved in lubricity by the silicon compounded in the outermost layer of the insulator layer, so that abrasion resistance is improved. Performance can be improved. Further, since silicon is compounded only in the outermost layer of the insulator layers formed in a plurality of layers, the manufacturing cost of the flame-retardant wear-resistant electric wire can be reduced.

According to the third aspect of the present invention, sufficient flame retardancy can be obtained, and the silicon blended in the insulator layer improves the smoothness of the surface of the electric wire, thereby improving the wear resistance. Can be. Further, by determining the lower limit of the compounding range of the metal hydroxide, sufficient flame retardancy can be secured.
Furthermore, from the upper limit of the compounding range of the metal hydroxide, it is not necessary to add a large amount of the metal hydroxide to the insulator layer, and it is possible to sufficiently secure mechanical properties such as abrasion resistance. Also,
By determining the lower limit of the silicon compounding range, sufficient surface lubrication can be ensured. Furthermore, it is not necessary to mix a large amount of silicon from the upper limit of the silicon compounding range, and the manufacturing cost of the flame-retardant wear-resistant electric wire can be suppressed.

According to the fourth aspect of the present invention, sufficient flame retardancy can be obtained, and the surface of the electric wire can be improved in lubricity by the silicon compounded in the outermost layer of the insulator layer, so that abrasion resistance is improved. Performance can be improved. Further, since silicon is compounded only in the outermost layer among the insulator layers formed in a plurality of layers, the manufacturing cost can be reduced. Further, by determining the lower limit of the compounding range of the metal hydroxide, sufficient flame retardancy can be secured. Furthermore, from the upper limit of the compounding range of the metal hydroxide, it is not necessary to add a large amount of the metal hydroxide to the insulator layer, and it is possible to sufficiently secure mechanical properties such as abrasion resistance. Further, by determining the lower limit of the silicon compounding range, sufficient surface lubrication can be ensured. Furthermore, it is not necessary to mix a large amount of silicon from the upper limit of the silicon compounding range, and the manufacturing cost of the flame-retardant wear-resistant electric wire can be suppressed.

According to the fifth aspect of the invention, sufficient flame retardancy can be obtained, and dimethyl silicon improves the smoothness of the surface of the electric wire, so that the wear resistance is improved.

According to the sixth aspect of the present invention, sufficient flame retardancy can be obtained, and the wear of the cable can be improved because the silicone compounded in the sheath improves the smoothness of the surface of the cable. .

According to the seventh aspect of the present invention, sufficient flame retardancy can be obtained, and the abrasion resistance can be improved because the surface of the cable is made smoother by the silicone compounded in the sheath. . Further, since silicon is compounded only in the sheath, the manufacturing cost can be reduced. Further, by determining the lower limit of the compounding range of the metal hydroxide, sufficient flame retardancy can be secured. Furthermore, from the upper limit of the compounding range of the metal hydroxide, it is not necessary to add a large amount of the metal hydroxide to the sheath, and mechanical properties such as abrasion resistance can be sufficiently ensured. Further, by determining the lower limit of the silicon compounding range, sufficient surface lubrication can be ensured. further,
There is no need to blend a large amount of silicon from the upper limit of the blending range of silicon, and the production cost of the flame-retardant abrasion-resistant cable can be suppressed.

According to the eighth aspect of the invention, sufficient flame retardancy can be obtained, and the dimethyl silicone compounded in the sheath improves the lubricity of the cable surface, so that the abrasion resistance is improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a flame-retardant wear-resistant electric wire according to the present invention.

FIG. 2 is a cross-sectional view showing one embodiment of the flame-resistant and wear-resistant cable according to the present invention.

[Explanation of symbols]

 1, 10 ...... Conductor 2 ...... Insulator layer 5 ...... Flame-resistant and wear-resistant electric wire 11 ...... Insulator 12 ... Insulated wire core 13 ... Sheath 14 ... Flame-resistant and wear-resistant cable

Claims (8)

[Claims] 1. A flame-retardant abrasion-resistant electric wire comprising an insulator layer formed by mixing a metal hydroxide and silicon with a polyolefin resin on a conductor. 2. An insulator layer formed by blending a metal hydroxide with a polyolefin resin is formed on a conductor in a plurality of layers, and one of the insulator layers formed in the plurality of layers is formed. A flame-retardant abrasion-resistant electric wire characterized in that silicon is blended in the outer layer. 3. A polyolefin resin 10 on a conductor.
A flame-retardant and abrasion-resistant electric wire having an insulating layer formed by mixing 40 to 200 parts by weight of a metal hydroxide and 1 to 10 parts by weight of silicon with respect to 0 parts by weight. 4. A polyolefin resin 10 on a conductor.
An insulating layer formed by mixing 40 to 200 parts by weight of a metal hydroxide with respect to 0 parts by weight is formed in a plurality of layers, and the outermost layer among the insulating layers formed in the plurality of layers is Silicon is added in an amount of 1 to 100 parts by weight of the polyolefin resin.
A flame-retardant, abrasion-resistant electric wire characterized in that 10 parts by weight are blended. 5. The flame-retardant and abrasion-resistant wire according to claim 1, wherein the silicon is dimethyl silicon. 6. An insulated wire composed of a polyolefin-based resin mixed with a metal hydroxide is coated on a conductor, and two or more insulated wire cores composed of a plurality of insulated wire cores are combined. A flame-retardant abrasion-resistant cable formed by forming a twisted inclusion and interposing a sheath formed by mixing a metal hydroxide and silicon with a polyolefin resin. 7. An insulated wire composed of 40 to 200 parts by weight of a metal hydroxide with respect to 100 parts by weight of a polyolefin resin is coated on a conductor. Or, after forming the insulated wire core with a plurality of twisted inclusions interposed therebetween, 40 to 200 parts by weight of a metal hydroxide and 1 to 10 parts by weight of silicon are blended with respect to 100 parts by weight of a polyolefin resin. Flame-resistant and wear-resistant cable covered with a sheath composed of 8. The flame-retardant wear-resistant cable according to claim 6, wherein the silicon is dimethyl silicon.