KR100384128B1 - A duplex thin wall insulation wire - Google Patents

Abstract

The present invention relates to a wire used for signal transmission and device control in a subway or railroad vehicle, and is composed of a crosslinked polyolefin, polybutylene terephthalate (PBT), and a thermoplastic polyester copolymer as the primary insulator (1). It is characterized by consisting of a thermoplastic polyester copolymer as the secondary insulator (3). The present invention relates to a structure of an electric wire coating having excellent flame retardancy and insulation performance while maintaining high mechanical properties even in a thin state.

Description

A duplex thin wall insulation wire

The present invention relates to shielded wires, and more particularly to a double thin insulated wire (7) used for signal transmission and device control in subway or rail vehicles.

As the system becomes more precise and complicated, various electric / electronic devices are becoming smaller and lighter, and the wires applied thereto are becoming thinner due to the increase in the internal temperature of the device and the reduction of space. In addition, even in a thin state, higher physical properties and high heat resistance are required, and it is required to exhibit a very low smoke density upon combustion with excellent flame retardancy compared to general electric wires.

The demand for such high performance / thin wires is rapidly increasing in the subway and railway vehicle sectors, and there are many problems in applying the conventional chlorinated polyolefin (13) insulation material. In the case of the chlorinated polyolefin (13), it is impossible to reduce the insulation thickness to 0.8 mm or less, and excellent flame retardancy, while the generation of smoke during combustion, and the generation of toxic gas is severe, so the safety of fire is low.

2 shows a cross-sectional view of a conventional wire 9. As shown in FIG. 2, the structure of the conventional wire 9 is a single insulator structure composed of a conductor 11 and a chlorinated polyolefin 13 surrounding the conductor 11.

The present invention has been made to solve the above problems, an object of the present invention is excellent flame retardancy and insulation while maintaining high mechanical properties even in the thin state with respect to the wire used for signal transmission and device control in subway or railway vehicles It is to provide a double thin insulated wire 7 having performance.

The object of the present invention as described above is that the primary insulator (1) is composed of a crosslinked polyolefin, polybutylene terephthalate (polybuthylene terephthalate), a thermoplastic polyester-based copolymer, the secondary insulator (3) is a thermoplastic polyester-based air It is achieved by a double thin insulated wire 7, characterized in that it is composed of coalescence.

A wire made of a conductor and an insulator is defined as a wire, and a cable formed by collecting several strands of wire and protecting it as a sheath is defined as a cable. In the present invention, the sheath body used for the cable was applied to the wire to design a double thin insulated wire. That is, the insulator of the wire is designed by double insulation so as to have the function of the insulator and the sheath, respectively.

In the present invention, a thermoplastic polyester copolymer is used alone or a magnesium hydroxide flame retardant filler surface-treated using a resin blended resin having a different hardness as a matrix for a high performance / high flame retardant wire coating composition. Or a technique used with a flame retardant such as melamine cyanurate was applied. As for the thermoplastic polyester copolymer, a composition flame-retardant with non-halogen was applied to the electric wire coating material. In addition, as shown in FIG. 1, the insulator of the wire is designed to be double insulated to give each of the functions as an insulator and a sheath, thereby providing a double thin insulated wire 7 featuring high performance / thin wires. Could develop.

The double thin insulated wire 7 obtained in the present invention can reduce the insulation thickness to 0.3 mm or less as compared with the conventional wire 9, which can reduce the size and weight and greatly reduce the installation space. In addition to the reduction of the amount of toxic gas generated during combustion, the amount of smoke generated was also reduced to 10% level compared with the use of chlorinated polyolefin (13), which greatly improved the fire safety. In addition, by applying a double insulation design using a thermoplastic polyester-based copolymer, as well as improved oil resistance and environmental resistance as compared to conventional halogen-free wires, wear resistance, resistance to notch propagation, Characteristics such as cutting characteristics and heat deformation were also greatly improved.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings.

1 is a cross-sectional view of a double thin wire according to an embodiment of the present invention.

2 is a cross-sectional view of a wire conventionally used.

* Explanation of symbols on the main parts of the drawings

1: primary insulator 3: secondary insulator

5: conductor 7: double thin insulated wire

9: conventional wire 11: conductor

13: chlorinated polyolefin

Hereinafter, the configuration of the double thin insulated wire according to the present invention will be described.

1 is a cross-sectional view of a double thin insulated wire according to an embodiment of the present invention. As shown in Figure 1, in the present invention, the double insulation is designed by dividing the function into two as follows.

First, the primary insulator (1) has a material selected so that the secondary insulator (3) to maximize the flame retardancy, low smoke resistance, oil resistance to have insulation performance, heat resistance and mechanical properties. To this end, polybutylene terephthalate and a polyester copolymer having high insulation performance are applied to the primary insulator 1, and a polyester-based air having high flame retardancy is applied to the secondary insulator 3. A polyester copolymer was applied.

Second, the primary insulator 1 is designed to give flame retardancy of insulation performance, heat resistance and self-extinguishing level, and the secondary insulator 3 is designed to have flame retardancy, low smoke resistance, oil resistance, and high mechanical properties. For this purpose, a polyester copolymer having high insulation performance and a flame retardant crosslinked polyolefin were applied to the primary insulator 1, and a high strength flame retardant polyester copolymer was applied to the secondary insulator 3. In both cases, the polymer composition used is a non-halogen flame-retardant material and generates no toxic gas upon combustion.

The characteristics of the flame-retardant material applied in the present invention was the use of a thermoplastic polyester copolymer alone or a matrix resin blended resins of different hardness. In addition, a magnesium hydroxide flame retardant filler surface-treated with stearic acid, oleic acid, amino silane, vinyl silane, stearic acid / silane, a polymer material, etc. may be used alone, or a composition in which the magnesium hydroxide flame retardant filler is mixed with melamine cyanurate is used. It was. In order to improve the insulation performance, the amount of inorganic flame retardant is increased by blending polybutylene terephthalate or by adding an olefinic copolymer resin and a modified olefinic copolymer resin. Improved flame retardant properties.

The double thin insulated wire 7 obtained in the present invention is a product having a 60% insulation thickness reduction and a 45% weight reduction compared to the conventional wire 9. It has a high tensile strength of 3.0 kgf / mm 2 or more and an elongation of 200% or more. The double thin insulated wire 7 obtained in the present invention has a flame retardancy that satisfies the International Electrotechnical Commission (IEC) 332-1, and high flame retardancy and low smoke that satisfies the low smoke characteristics of IEC-1034. It is a product with excellent characteristics.

Hereinafter, the operation and the embodiment of the double thin insulated wire 7 of the present invention having the configuration as described above will be described.

Modified olefin copolymer resin (modified olefinic copolymer resin) in the present invention increases the polarity of the molecule by increasing the content of the olefin (olefin) serves to improve the affinity with the inorganic flame retardant. In addition, magnesium hydroxide surface-treated with vinyl silane or amino silane disperses well in the resin matrix and maintains a proper binding force in the resin matrix. This contributes to the formation of a hard char after high charge and combustion of the inorganic flame retardant. In addition, it is possible to effectively control the insulation performance by comparing / reviewing the insulation performance by treating the magnesium hydroxide with stearic acid, oleic acid, aminosilane, vinyl silane, stearic acid / silane, and other polymer materials.

In addition, in order to improve insulation performance, compatibility with co-poly (ether-ester) resin and co-poly (ester-ester) resin alone or in a mixture Polybutylene terephthalate was blended and used as matrix. Thermoplastic polyester-based resin can control various physical properties such as hardness, tensile strength, elongation and electrical properties such as volume specific resistance according to the ratio of the rigid structure and the flexible structure.

<Example>

Component of Insulator Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Example 1 Example 2 Example 3 Primary Insulator Polyethylene chloride Crosslinked polyethylene Polyester copolymer Polybutylene terephthalate Polybutylene terephthalate Polyester Copolymer Crosslinked polyolefin Primary Insulator Thickness (mm) 0.3 0.3 0.3 0.15 0.15 0.15 0.15 Secondary insulator - - - Crosslinked polyethylene Polyester Copolymer Polyester Copolymer Polyester Copolymer Secondary Insulator Thickness (mm) - - - 0.15 0.15 0.15 0.15

Physical Properties of Each Example Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Example 1 Example 2 Example 3 Strength (kgf / mm2) 1.02 1.05 2.92 4.01 3.97 3.71 3.45 % Elongation 243 295 324 35 264 298 375 Insulation Resistance (MΩkm) (a) Pass Pass Under Pass Pass Pass Pass Flame retardant (b) Pass Under Pass Under Pass Pass Pass Smoke density (c) Under Pass Pass Pass Pass Pass Pass

a: resistance over 1 km of wire. The required level is 500 or more.

b: Tested according to IEC 332-1 flame retardant test standard. The required level is less than 200 mm of combustion length.

c: Tested according to IEC 1034. The required level is more than 90% transmittance.

According to the double thin insulated wire 7 according to the present invention as mentioned above, the insulation thickness is reduced to 0.3 mm or less compared to the conventional wire 9, and the installation space is greatly reduced along with the reduction in size and weight. Can be. In addition, the reduction of the amount of toxic gases generated during combustion and the amount of smoke are also reduced to 10% level than when using the chlorinated polyolefin (13), so that the stability to fire is greatly improved. In addition, properties such as oil resistance, environmental improvement, wear resistance, notch resistance, cutting resistance, and heat deformation were greatly improved.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Accordingly, the appended claims include such modifications and variations as fall within the spirit of the invention.

Claims (6)

Conductor 5; A primary insulator (1) comprising a matrix resin blending a crosslinked polyolefin, a polybutylene terephthalate, and a thermoplastic polyester copolymer surrounding the conductor 5; And Double insulated wire (7), characterized in that consisting of; a secondary insulator (3) consisting of a thermoplastic polyester copolymer surrounding the primary insulator (1). According to claim 1, wherein the thermoplastic polyester copolymer (polyester copolymer) is a co-poly (ether-ester) resin (co-poly (ether-ester) resin), copolyester-ester resin (co-poly (ester-ester) Double thin insulated wire (7), characterized by consisting of a single resin or a mixture of two or more resins). 2. The double thin insulated wire according to claim 1, wherein an olefin copolymer and a modified olefinic copolymer are mixed with the thermoplastic polyester copolymer. (7). 2. The double thin insulated wire (7) according to claim 1, wherein magnesium hydroxide and melamine cyanurate are formed singly or mixed with the thermoplastic polyester copolymer. 2. The double thin insulated wire according to claim 1, wherein the crosslinked polyolefin is composed of a composition flame retarded with non halogen. The double thin insulated wire according to claim 4, wherein the surface of the magnesium hydroxide is selected from stearic acid, oleic acid, amino silane, stearic acid / silane, vinyl silane, and a polymer material. 7).