KR20110117480A - Cable for ship comprising halogen free inner covering - Google Patents

Abstract

The ship wire of the present invention includes a bedding body having a tensile stress value of 12 to 15 Mpa at a tensile strain of 150% and a tensile stress value of 8 to 10 Mpa at an initial saddle strain of 5%. As the bedding body of the present invention has the above tensile stress value, not only the original function of the bedding body itself but also simultaneously satisfy the functions and characteristics of the conventional braided body can have the impact strength and the crush strength required for the cable. Since it is possible to replace the conventional braided body, it is possible to reduce the weight and manufacturing cost of the wire for ships.

Description

Cable For Ship Comprising Halogen Free Inner Covering

The present invention relates to a ship electric wire including an inner covering which simultaneously satisfies the functions and characteristics of the braided body and the bedding body while replacing the conventional braided body.

Cables for ships such as power, control and signaling used in ships include galvanized steel wires, galvanized steel wires, or braided copper wires on the bedding body to prevent deformation of the wires due to tension and side pressure during installation. The structure is generally used. Such a cable comprises an insulator (2), a filler (3), a separation tape (4), a bedding body (5), a braid body (6), a sheath body around the conductor (1) as shown in FIG. It has a cable structure conforming to the conventional JIS standard including (7). In particular, in the hazardous area or explosion-proof area, a cable in which the braided body 6 is internally or externally used is used. In this case, the cable having the braided body has a large outer diameter, and the flexibility of the cable is not secured due to the influence of the braided body such as steel wire, so it is not easy to install in a narrow space. In addition, the braided body is manufactured by weaving a thin wire wire, but in this weaving process, the wires are inhomogeneously entangled in many cases. Cables including the braided body have to increase the weight of the cable due to the specific gravity of the braided body has shown a lot of difficulties in meeting the specific cable weight limit required by the owner and shipyard. In addition, the braided body of the cable has resulted in an increase in the manufacturing cost since the cable manufacturing process requires another additional manufacturing process.

Therefore, in order to solve various problems arising from the braided body, it is necessary to study a bedding body that simultaneously satisfies the functions and characteristics of the braided body and the bedding body while replacing the braided body.

The technical problem to be achieved in the present invention is to replace the conventional braided body of the ship wire, and to provide a warship for ships including a bedding body that ultimately meets the functions and characteristics of the braided body and the bedding body at the same time.

In order to achieve the technical problem to be achieved by the present invention, the vessel wire of the present invention is one or more conductors located in the center, the insulators surrounding each of the conductors, the bedding body surrounding all of the at least one insulator and the sheath body surrounding the bedding body The bedding body has a tensile stress value of 12 to 15 Mpa at a tensile strain of 150%, and a tensile stress value of 8 to 10 Mpa at an initial saddle strain of 5%.

Marine wire of the present invention exhibits excellent flame retardancy despite having a halogen free bedding body.

In addition, the wire for ship of the present invention can replace the conventional braided body by including a bedding body that satisfies the functions and characteristics of the conventional braided body and the bedding body at the same time, thereby reducing the weight of the wire and reduce the manufacturing cost You can get it.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings in this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the invention that follows, serve to further understand the technical idea of the present invention. It should not be.
1 shows a cable structure conforming to the conventional JIS standard.
2 shows a ship cable structure of the present invention.
3 shows a stress-stress curve for the bedding body of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the ordinary or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own inventions. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

2 shows a configuration of a ship cable according to a preferred embodiment of the present invention. Referring to FIG. 2, the ship cable of the present invention includes at least one conductor 11 located at a center portion thereof, an insulator 12 surrounding each conductor, and a filler provided to be filled outside of the conductor 11 and the insulator 12. (13), the separation tape 14 which wraps around the conductor 11 and the insulator 12, the bedding body 15 which wraps the said separation tape 14, and the sheath body which wraps the said bedding body 15 ( 16).

The filler 13 maintains the associated structure of the conductors 11 and provides a cushioning function, and the separation tape 14 functions to firmly bind the conductors 11 to each other.

The sheath body 16 is provided at the outermost side of the cable to protect the cable from external impact or corrosion.

The bedding body 15 protects the conductors 11 and the insulators 12 therein by absorbing an external impact, and is halogen-free.

The bedding body has a tensile stress value of 12 to 15 Mpa at 150% tensile strain and 8 to 10 Mpa at 5% initial saddle strain, as shown in the stress-stress curve of FIG. 3. Has a tensile stress of. The bedding body of the present invention has not only the original function of the bedding body itself by having the above tensile stress value, but also satisfies the functions and characteristics of the conventional braided body and can have the impact strength and the crush strength required for the cable. It will be able to replace the conventional braid.

Preferably, the bedding body has an oxygen index of 32 to 35, so that the flame retardancy required for the cable can be satisfied even though it does not contain a halogen component.

[Example]

The present invention will be described in more detail with reference to the following Examples. The average person skilled in the art to which the present invention pertains may modify the present invention in various other forms in addition to the embodiments described in the following examples, and the following examples exemplify the present invention, but the scope of the technical idea of the present invention is as follows. It should not be construed as intended to limit the scope of the examples.

In order to examine the effects of the tensile stress value and the oxygen index of the bedding body of the present invention, the bedding body of Examples and Comparative Examples having the characteristics shown in Table 1 below were prepared. The tensile stress value was measured at a tensile tester speed of 250 mm / min for the bedding specimens according to IEC 60811-1-1. According to ASTM D2863, the oxygen index is naturally decayed for 3 minutes or more or 50 mm or more for a bedding specimen having a width of 6.5 ± 0.5 mm, a thickness of 3.0 ± 0.25 mm, and a height of 70 to 150 mm. Calculated.

In the case of deviation from the range of the tensile stress value and the oxygen index of the present invention, it is shown in italics in Table 1.

At 150% tensile strain
Tensile Stress Value (Mpa) At an initial tensile strain of 5%
Tensile Stress Value (Mpa) Oxygen Index (%)
Example

One 12 8 33 2 13.2 8.5 34 3 14.2 9 32 4 15 10 35

Comparative example

One 11 5 30 2 16 15 37 3 12.5 7 32 4 10 8 35 5 13 8.5 28

[Explanation of Composition of Bedding Body Used in Table]

Bedding body of Example 1 was prepared by mixing 130 parts by weight of aluminum hydroxide with respect to 100 parts by weight of the base resin, ethylene vinyl acetate copolymer (vinyl acetate content 17%, melt index 0.8 g / 10 minutes) 70 as the base resin A weight part and 30 weight part of modified low density polyethylene were mixed and used.

Bedding body of Example 2 was prepared by mixing 100 parts by weight of aluminum hydroxide and 30 parts by weight of magnesium hydroxide with respect to 100 parts by weight of the base resin, ethylene vinyl acetate copolymer (17% vinyl acetate content, melt index 0.8) as the base resin g / 10 min) was used by mixing 70 parts by weight and 30 parts by weight of modified low density polyethylene.

Bedding body of Example 3 was prepared by mixing 130 parts by weight of aluminum hydroxide with respect to 100 parts by weight of the base resin, ethylene vinyl acetate copolymer (vinyl acetate content 17%, melt index 0.8 g / 10 minutes) 60 as the base resin A mixture of parts by weight and 40 parts by weight of modified low density polyethylene was used.

Bedding body of Example 4 was prepared by mixing 130 parts by weight of aluminum hydroxide with respect to 100 parts by weight of the base resin, ethylene vinyl acetate copolymer (vinyl acetate content 17%, melt index 0.8 g / 10 minutes) 50 as the base resin A weight part and 50 weight part of modified low density polyethylene were mixed and used.

Bedding body of Comparative Example 1 was prepared by mixing 130 parts by weight of aluminum hydroxide with respect to 100 parts by weight of the base resin, ethylene vinyl acetate copolymer (28% vinyl acetate content, 4 g / 10 minutes melt index) 90 as the base resin A weight part and 10 weight part of modified low density polyethylene were mixed and used.

The bedding body of Comparative Example 2 was prepared by mixing 100 parts by weight of aluminum hydroxide and 30 parts by weight of magnesium hydroxide based on 100 parts by weight of an ethylene vinyl acetate copolymer (28% vinyl acetate content, 4 g / 10 min of melt index). .

The bedding body of Comparative Example 3 was prepared by mixing 130 parts by weight of aluminum hydroxide with respect to 100 parts by weight of an ethylene vinyl acetate copolymer (vinyl acetate content of 28%, melt index of 4 g / 10 min).

Bedding body of Comparative Example 4 was prepared by mixing 160 parts by weight of aluminum hydroxide with respect to 100 parts by weight of the base resin, ethylene vinyl acetate copolymer (28% vinyl acetate content, 4 g / 10 minutes melt index) 70 as the base resin A weight part and 30 weight part of modified low density polyethylene were mixed and used.

The bedding body of Comparative Example 5 was prepared by mixing 130 parts by weight of aluminum hydroxide with respect to 100 parts by weight of the linear low density polyethylene base resin.

Measurement and evaluation of physical properties

Including the bedding body according to the above Examples (1 to 4) and Comparative Examples (1 to 5) to prepare a cable cable for ships as shown in FIG. At this time, the conductor 11 is copper plated with tin, and a diameter of 9.18 mm was used, and the insulator 12 had a tensile strength of 0.9 kgf / mm ² and an elongation of 230%, and a high thickness of 1.0 mm. Strength ethylene propylene rubber was used. In addition, the sheath 16 used a halogen-free polyolefin having a tensile strength of 1.3 kgf / mm ² and an elongation of 210% and a thickness of 1.9 mm.

The results of measuring the impact strength, the crush strength, the flexibility, and the flame retardance of the specimens of the obtained Examples and Comparative Examples are summarized in Table 2 below. When it deviates from the reference values of impact strength, crush strength, flexibility, and flame retardancy, italics are shown in Table 2. Brief experimental conditions are as follows.

㉠ Impact strength (J)

Impact strength was measured by a drop-weight test using an Instron Dynatun 9250 V instrument to drop the impactor with an outer diameter of 50 mm. It is evaluated to have excellent impact strength when the value is lower than the impact strength of 25 J of the cable according to the conventional JIS standard.

㉡ tack strength (cm)

The crimp strength is a test for evaluating the cable for damage by sharp objects during cable installation.The pin and KNIFE needles are applied with a force of 10 kg of mass and 15 J at a height of 0.15 m. The measurement was measured. It is evaluated to have excellent tack strength when the value is lower than the tack strength (PIN type: 19.4 cm, KNIFE type: 15.8 cm) of the cable according to the conventional JIS standard.

㉢ flexibility (kgf)

The Instron 5662 was used to fasten the cable to the "c" tool and to apply a compression force until the change in the compression length of the measuring instrument was 50 mm. The higher the compression force, the lower the flexibility. It is evaluated to have excellent flexibility when the cable flexible value according to the conventional JIS standard is lower than 4.5 kgf.

㉣ flame retardant

It is tested according to IEC 60332-3 cat.A. If the carbonized part is 2.5 m or less after 40 minutes of flame application time, it is considered to have passed the flame retardancy test.

Impact strength (J) Tack strength (cm) Flexibility (kgf) Flammability


Example

One 23 PIN Type: 18.2
KNIFE Type: 12.8 3.5 pass 2 22 PIN Type: 17.3
KNIFE Type: 13.5 3.8 pass 3 20 PIN Type: 17.1
KNIFE Type: 12.0 4.0 pass 4 19 PIN Type: 16.5
KNIFE Type: 11.3 4.2 pass



Comparative example

One 35 PIN Type: 24.0
KNIFE Type: 18.0 2.8 pass 2 17 PIN Type: 15.0
KNIFE Type: 10.1 6.0 pass 3 28 PIN Type: 19.0
KNIFE Type: 15.2 3.0 pass 4 23 PIN Type: 21.0
KNIFE Type: 17.0 4.0 pass 5 21 PIN Type: 16.9
KNIFE Type: 12.3 3.9 fail

As summarized in Table 2, the marine cable including the bedding bodies of Examples 1 to 4 satisfies the reference values in terms of impact strength, crush strength, flexibility and flame retardancy.

On the other hand, Comparative Example 1 did not satisfy the standard value required for the ship cable in the impact strength and crush strength. These results indicate cable specimens comprising a bedding body having a tensile stress value (Mpa) at a tensile strain of 150% and a tensile stress value (Mpa) at an initial tensile strain of 5%, which are lower than the values presented herein. It was due to use.

Comparative Example 2 did not meet the criterion required for ship cables in flexibility, and this result was higher than the value presented in the present invention, the tensile stress value (Mpa) at 150% tensile strain and the initial tensile strain of 5% This is due to the use of cable specimens comprising a bedding body having a tensile stress value (Mpa) at.

Comparative Example 3 did not satisfy the reference value required for the ship cable in the impact strength. This result is due to the use of cable specimens comprising a bedding body having a tensile stress value (Mpa) at an initial tensile strain of 5%, which is lower than the value presented in the present invention.

In Comparative Example 4, the crimp strength did not satisfy the standard value required for the ship cable. This result is due to the use of cable specimens comprising a bedding body having a tensile stress value (Mpa) at a tensile strain of 150%, which is lower than the value presented in the present invention.

Comparative Example 5 did not satisfy the standard value required for ship cables in flame retardancy. This result is due to the use of cable specimens containing bedding bodies having an oxygen index lower than the values presented in the present invention.

As described above, optimal embodiments of the present invention have been disclosed. Although specific terms have been used in the specification including the present embodiment, it is only used for the purpose of describing the present invention to those skilled in the art in detail and used to limit the meaning or limit the scope of the present invention described in the claims. Make it clear.

1 and 2 indicate the following.
1, 11... Conductor
2, 12... Insulator
3, 13... Fill
4, 14... Separation tape
5, 15... Bedding
6 ... Braid
7, 16... Sische

Claims (3)

One or more conductors centrally located;
An insulator surrounding each conductor;
Bedding bodies surrounding all of the at least one insulator; And
A sheath body surrounding the bedding body,
The bedding vessel has a tensile stress value of 12 to 15 Mpa at a tensile strain of 150%, a vessel wire, characterized in that it has a tensile stress value of 8 to 10 Mpa at an initial saddle strain of 5%. The method of claim 1,
The bedding vessel is characterized in that the ship has an oxygen index of 32 to 35. The method of claim 1,
The bedding layer is a wire for ships, characterized in that non-halogen (halogen free).

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