JPH06275135A - Thin insulated electric wire - Google Patents

Abstract

PURPOSE:To provide a thin insulated electric wire, the friction resistance of which is drastically improved, and to which good flame resistance, waterproof property and withstand voltage are given by coating the wire with flame resistant polyolefine containing phosphor flame retarder in no more than a specific insulating thickness. CONSTITUTION:A thin insulated electric wire is provided by coating the wire with polyolefine flame-retarded to the level of oxygen index of 20-25, in which a phosphorous flame retarder is included, in no more than 0.30mm insulation thickness. The abrasion resistance of the electric wire thus coated is approximately five times as large as that of the electric wire of non-flame-retarded polyolefine single composition, which is conventionally considered most advantageous in terms of abrasion resistance. This is because the slide property of an insulator is changed. Reduction in waterproof property and in withstand voltage due to addition of the phosphor flame retarder is not observed in the range of oxygen index of 20-25. The oxygen index as mentioned herein is based on JIS K7201, and is the value measured by means of a sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention mainly relates to automobile electric wires,
In particular, the present invention relates to a thin-wall insulated wire used as a clean (non-halogen) wire.

[0002]

2. Description of the Related Art Conventionally, JASO has been used for electric wires for automobiles.
As shown in D-608 and JASO D-611, flame-retardant polyethylene or PVC coated with an insulation thickness of about 0.5 mm to 0.8 mm was used. Flame-retardant cross-linked PE is used for applications that particularly require heat resistance. Usually, low density polyethylene or high density polyethylene is used as the base polymer, and it is general to use a halogen-based flame retardant and an inorganic flame retardant together for flame retardation.

[0003]

In recent years, there have been active movements for weight reduction and space saving of automobiles and devices, and it has been strongly desired to reduce the thickness of the electric wire insulator. However, if the conventional flame-retardant cross-linked polyethylene material for an electric wire with an insulation thickness of 0.5 mm is used as it is for an electric wire with an insulation thickness of 0.2 mm, the wear characteristics will be significantly reduced, and it is not suitable for practical use at all. Has been revealed.

Further, the flame-retardant technology using a halogen-based flame retardant is not suitable from the viewpoint of recent recycling and cleanliness in the automobile industry because it produces a toxic halogen-based gas during combustion. there were.

The present invention solves the above-mentioned drawbacks of the prior art, significantly improves the wear resistance, and has excellent flame retardancy,
The purpose of the present invention is to provide a new thin insulated wire that has water resistance and withstand voltage characteristics and is optimal as an ultra-thin non-halogen electric wire for automobiles.

[0006]

SUMMARY OF THE INVENTION The gist of the present invention is to coat a polyolefin containing a phosphorus-based flame retardant and flame retarded to an oxygen index of about 20 to 25 to an insulator thickness of 0.30 mm or less. In order to obtain a thin-walled insulated electric wire, the abrasion resistance is remarkably improved and good flame resistance, water resistance, and withstand voltage characteristics are imparted.

[0007]

[Example] Since abrasion resistance remarkably deteriorates when the thickness of the insulator is simply reduced, research on scrape abrasion resistance was advanced. As a result, it was found that the addition of halogen-based and inorganic flame-retardants was a major cause of the deterioration of the characteristics. Then, as a result of various studies on other flame retardants, it was confirmed that the phosphorus-based flame retardants cause a unique phenomenon that is not found in other flame retardants.

Specifically, it is a phosphorus-based flame retardant with an oxygen index of 20.
No. 25 to 25 flame-retardant polyolefin was coated to an insulator thickness of 0.30 mm or less. The abrasion resistance of an electric wire coated with such a coating is about 5 times that of an electric wire with a single composition of polyolefin (non-flame-retardant), which has hitherto been considered to be most advantageous for the abrasion resistance.

It is considered that the cause of this dramatic result is a change in the slip property of the insulator. It is considered that the abrasion of the insulator progresses due to the adhesion and scraping of the polymer, but the presence of the phosphorus-based flame retardant causes slippage, and the abrasion phenomenon of the polymer is significantly improved. In addition, the decrease in water resistance, withstand voltage, etc., which may be caused by the addition of the phosphorus-based flame retardant, is hardly recognized in the oxygen index range of 20 to 25. The oxygen index referred to here is a value measured by a sheet in accordance with JIS K7201.

If the oxygen index exceeds 25, not only the wear resistance is not improved but also the water resistance and the withstand voltage are significantly lowered. The decrease in abrasion resistance is considered to be due to the acceleration of the polymer abrasion phenomenon due to the excessive addition of the flame retardant, as seen in the case of the halogen-based or inorganic flame-retardant. On the other hand, on the contrary, if the oxygen index is less than 20, it becomes impossible to impart the minimum required flame retardancy as an electric wire.

The base polymer used may be a polyolefin or a mixture thereof, and preferably contains 50% or more of polyolefin. Polymers other than polyolefin cannot provide the minimum necessary electric insulation for electric wires.

Specific examples of the base polymer include polyethylene, polypropylene, polymethylpentene, ethylene vinyl acetate copolymer (EVA), ethylene acrylic acid copolymer (EEA) and chlorinated polyethylene (CPE). Can be mentioned.

Any flame retardant may be used as long as it is a phosphorus flame retardant, but powdery ones having a high melting point are preferable from the viewpoint of compounding.

By the way, in the case of an electric wire using a phosphorus-based flame retardant having a melting point of 60 degrees Celsius or more as a flame retardant, the abrasion resistance of the electric wire is a polyolefin single composition which has been considered to be most advantageous until now. The value was 5 to 10 times higher than that of the (burned) electric wire. The cause of this dramatic result is considered to be a change in the slipperiness of the insulator.

That is, when a phosphorus-based flame retardant having a melting point of 60 degrees Celsius or higher is used, the flame retardant does not melt due to frictional heat during the progress of wear, and the bleeding of the flame retardant is reduced and the slipperiness is improved. It is considered that the polymer adhesion phenomenon was maximally prevented by this.

Further, in the case of an electric wire using a phosphorus-based flame retardant containing nitrogen as a flame retardant, the abrasion resistance of the electric wire has been considered to be most advantageous until now. The value was about 10 times that of the electric wire. The cause of this dramatic result is considered to be a change in the slipperiness of the insulator.

That is, the remarkable effect of the phosphorus-containing flame retardant containing nitrogen was recognized. These flame retardants have a function of significantly suppressing the phenomenon that the polymer adheres to the metal surface, and as a result, It is considered that the wear resistance is significantly improved.

Specific examples of the present invention will be described below.
There are three types: "when a phosphorus-based flame retardant is included", "when a phosphorus-based flame retardant having a melting point of 60 degrees Celsius or less is used", and "when a phosphorus-containing flame retardant has a structure containing a nitrogen atom". The cases will be described in comparison with comparative examples.

The abrasion resistance test shown in each chart described later was conducted by using the apparatus shown in FIG. In FIG. 4, A is an electric wire insulator, B is an electric wire conductor, 1 is a load, 2 is a blade, 3 is an indicator lamp, and 4 is a battery. A blade with a load of 5N and a pole ratio of 0.125R is pressed against the electric wire (sample) arranged as shown in the figure, and the section of 1.5 mm is reciprocated at a speed of 60 times / minute. The number of times of reciprocation until the blade and the conductor were short-circuited was evaluated for each electric wire described below. When the number of reciprocations was 200 or more, it was determined that the abrasion resistance was good.

The flame retardancy test shown in each chart described later is shown in FIG.
It carried out using the apparatus shown in. In FIG. 5, A is an electric wire insulator, B is an electric wire conductor, 5 is a gas burner, 6 is a reducing flame, and 7 is an oxidizing flame. As shown in the figure, the length is about 3
A 0 mm electric wire (sample) was supported horizontally, the tip of the reducing flame was applied from the lower side of the central part of the electric wire for 10 seconds, and when the flame was gently removed, the time until the flame of the electric wire disappeared was measured. The flame retardancy was judged to be good within 30 seconds.

Regarding the water resistance shown in each of the following tables,
The insulation resistance was measured after immersion in warm water of 80 degrees Celsius for 240 hours. Water resistance of 50 MΩ-Km or more was judged to be good.

Regarding the withstand voltage shown in each chart described later,
Using an impulse spark tester, the condition was set to 5000 V / 0.15 S, and it was judged whether or not the insulator was free of sparks.

First, a specific example of the present invention in the case of "containing a phosphorus-based flame retardant" shown in the chart of FIG. 1 will be described. Each sample (electric wire) was prepared by coating a conductor obtained by twisting seven copper wires having an outer diameter of 0.32 mm with the resin composition shown in the chart of FIG.

Example 1 100 parts by weight of polyethylene Hi-Zex 5305E (density: 0.953 g / cm ³ , MI: 0.8 g / 10 minutes, manufactured by Mitsui Petrochemical Industry Co., Ltd.) was added to a condensed phosphoric acid ester (phosphorus type). 20 parts by weight of a flame retardant, trade name: PX200, manufactured by Daihachi Chemical Co., Ltd. was mixed and kneaded at a temperature of 180 ° C. with a pressure kneader. The wire was extruded using a Brabender extruder and coated to a thickness of 0.20 mm. Cylinder temperature C1
C3 was 130,180,200 degrees Celsius in that order, and the temperature of the neck, head and die was 200 degrees Celsius. The extrusion speed was 10 m / min. The oxygen index of the coating material was 20.5. Results of measurement test, wear resistance, flame resistance,
Water resistance and withstand voltage were all good.

Example 2 100 parts by weight of polypropylene ace polypro PY-02 (density: 0.90 g / cm ³ , MI: 1.2 g / 10 minutes, Showa Denko KK) was added to condensed phosphoric acid ester (phosphorus). Flame retardant, trade name: PX201, manufactured by Daihachi Chemical Co., Ltd.) 40 parts by weight, and an electric wire was extruded under the same conditions as in Example 1. The oxygen index of the coating material was 24.5. As a result of the measurement test, wear resistance, flame resistance, water resistance, and withstand voltage were all good.

Example 3 Polymethylpentene TPX DX-8
45 (density: 0.835g / cm ³ , MI: 0.8g / 10min, manufactured by Mitsui Petrochemical Industry Co., Ltd.) 100 parts by weight of condensed phosphoric acid ester (phosphorus flame retardant, trade name: PX202, Daihachi Chemical Co., Ltd.) (Manufactured by Co., Ltd.) 30 parts by weight were mixed and an electric wire was extruded and molded under the same conditions as in Example 1. The oxygen index of the coating material was 22. As a result of the measurement test, wear resistance, flame resistance, water resistance, and withstand voltage were all good.

(Example 4) Hi-Zex of polyethylene
5305E (Density: 0.953g / cm ³ , MI: 0.8g / 10min, Mitsui Petrochemical Industry Co., Ltd.) 100 parts by weight, melamine phosphate (phosphorus flame retardant, trade name: P-7202, Sanwa (Manufactured by Chemical Co., Ltd.) 25 parts by weight were mixed, and an electric wire was extruded and molded under the same conditions as in Example 1. The oxygen index of the coating material was 21. As a result of the measurement test, wear resistance, flame resistance, water resistance, and withstand voltage were all good.

(Example 5) Hi-Zex of polyethylene
5305E (density: 0.953g / cm ³ , MI: 0.8g / 10min, manufactured by Mitsui Petrochemical Industry Co., Ltd.) 100 parts by weight, melamine phosphate (phosphorus flame retardant, trade name: MPPA, Sanwa Chemical Co., Ltd.) (Manufactured by the company) 30 parts by weight were mixed, and an electric wire was extruded and molded under the same conditions as in Example 1. The oxygen index of the coating material was 21. Results of measurement test, abrasion resistance, flame resistance, water resistance,
The withstand voltage was all good.

(Example 6) Ammonium polyphosphate (phosphorus-based) was added to 100 parts by weight of ace polypro PY-02 (density: 0.90 g / cm ³ , MI: 1.2 g / 10 minutes, manufactured by Showa Denko KK) of polypropylene. 40 parts by weight of a flame retardant, trade name: EXOLIT422, manufactured by Hoechst Co., Ltd. was mixed and an electric wire was extruded and molded under the same conditions as in Example 1. The oxygen index of the coating material was 24. Results of measurement test, abrasion resistance, flame resistance, water resistance,
The withstand voltage was all good.

(Comparative Example 1) Hi-Zex of polyethylene
5305E (density: 0.953 g / cm ³ , MI: 0.8 g / 10 minutes, manufactured by Mitsui Petrochemical Co., Ltd.) was mixed with 7 parts by weight of decabromodiphenyl ether and 2 parts by weight of antimony trioxide, An electric wire was extruded and molded under the same conditions as in Example 1. The oxygen index of the coating material was 22. As a result of the measurement test, it was confirmed that the wear resistance was inferior.

Comparative Example 2 100 parts by weight of polypropylene Ace Polypro PY-02 (density: 0.90 g / cm ³ , MI: 1.2 g / 10 minutes, Showa Denko KK) was added with 50 parts by weight of magnesium hydroxide. Parts were blended and an electric wire was extruded under the same conditions as in Example 1. The oxygen index of the coating material was 23. As a result of the measurement test, it was confirmed that the wear resistance was inferior.

(Comparative Example 3) 10 parts by weight of condensed phosphoric acid ester (phosphorus flame retardant, trade name: PX201, manufactured by Daihachi Chemical Co., Ltd.) was mixed with 100 parts by weight of polypropylene ace polypro PY-02. An electric wire was extruded under the same conditions as in Example 1. The oxygen index of the coating material was 19.5. As a result of the measurement test, it was confirmed that the abrasion resistance, water resistance, and withstand voltage were good, but the flame retardancy was poor.

(Comparative Example 4) 60 parts by weight of ammonium polyphosphate (phosphorus flame retardant, trade name: EXOLIT422, manufactured by Hoechst) was mixed with 100 parts by weight of polypropylene ace polypro PY-02, and Example 1 was used. The electric wire was extruded and molded under the same conditions as in. The oxygen index of the coating material was 26. As a result of the measurement test, it was confirmed that the flame resistance was good, but the wear resistance, water resistance, and withstand voltage were all inferior.

(Comparative Example 5) An ace polypro PY-02 single material of polypropylene was used to extrude an electric wire under the same conditions as in Example 1. The oxygen index of polypropylene was 19. As a result of the measurement test, it was confirmed that the flame retardancy was poor and the wear resistance was also considerably poor.

Second, in the case of using a phosphorus-based flame retardant having a melting point of 60 ° C. or less as shown in the chart of FIG.
Specific examples of the present invention including the following will be described. For each sample (electric wire), a copper wire with an outer diameter of 0.32 mm
The resin composition shown in the chart of FIG. 2 was coated on the main twisted conductor.

(Example 7) 100 parts by weight of polyethylene Hi-Zex 5305E (density: 0.953 g / cm ³ , MI: 0.8 g / 10 minutes, manufactured by Mitsui Petrochemical Co., Ltd.) was added to a phosphorus-based flame retardant (type: 20 parts by weight of phosphoric acid ester, trade name: PX200, melting point 96 to 98 degrees Celsius, manufactured by Daihachi Chemical Co., Ltd.) were mixed and kneaded with a pressure kneader at a temperature of 180 degrees Celsius. The wire is extruded using a Brabender extruder and the thickness is 0.20.
mm. Cylinder temperatures C1 to C3 are 130 and 18 in that order
The temperature of the neck, head and die was 200 degrees Celsius. The extrusion speed is 10m / min
And The oxygen index of the coating material was 20.5. As a result of the measurement test, wear resistance, flame resistance, water resistance, and withstand voltage were all good. In particular, the wear resistance was 1050 times, which was a very good value.

(Example 8) 100 parts by weight of ace polypro PY-02 (density: 0.90 g / cm ³ , MI: 1.2 g / 10 minutes, Showa Denko KK) of polypropylene was added to a phosphorus-based flame retardant (type). : Phosphate ester, trade name: PX201, melting point 168 degrees Celsius
40 to 169 degrees (manufactured by Daihachi Chemical Co., Ltd.) was mixed, and an electric wire was extruded under the same conditions as in Example 7.
The oxygen index of the coating material was 24.5. Measurement test results,
Abrasion resistance, flame retardancy, water resistance, and withstand voltage were all good. In particular, the abrasion resistance showed a good value of 680 times.

Example 9 Polymethylpentene TPX DX
-845 (Density: 0.835g / cm ³ , MI: 0.8g / 10min, Mitsui Petrochemical Industry Co., Ltd.) 100 parts by weight, phosphorus-based flame retardant (type: phosphate ester, trade name: PX202, melting point Celsius 1
30 parts by weight of 82 degrees to 183 degrees (manufactured by Daihachi Chemical Co., Ltd.) were mixed, and an electric wire was extruded under the same conditions as in Example 7. The oxygen index of the coating material was 23. As a result of the measurement test, wear resistance, flame resistance, water resistance, and withstand voltage were all good. Particularly, the wear resistance was 1,160 times, which was a very good value.

(Comparative Example 7) 100 parts by weight of polypropylene Ace Polypro PY-02 (density: 0.90 g / cm ³ , MI: 1.2 g / 10 minutes, Showa Denko KK) was added to a phosphorus-based flame retardant (type : Phosphate ester, trade name: TSTP, melting point: 5 degrees Celsius
(0 degree, manufactured by Daihachi Chemical Co., Ltd.) 30 parts by weight, and an electric wire was extruded under the same conditions as in Example 7. The oxygen index of the coating material was 21. As a result of the measurement test, it was confirmed that the wear resistance was inferior to that of the example.

(Comparative Example 8) 100 parts by weight of polypropylene Ace Polypro PY-02 (density: 0.90 g / cm ³ , MI: 1.2 g / 10 minutes, Showa Denko KK) was added to a phosphorus-based flame retardant (type : Phosphate ester, trade name: TPP, melting point: 48.5 degrees Celsius
(Manufactured by Daihachi Chemical Co., Ltd.) 30 parts by weight, and an electric wire was extruded under the same conditions as in Example 7. The oxygen index of the coating material was 19.5. As a result of the measurement test, it was confirmed that the wear resistance was inferior to that of the example.

(Comparative Example 9) A phosphorus poly flame retardant (100 parts by weight of polypropylene Ace Polypro PY-02 (density: 0.90 g / cm ³ , MI: 1.2 g / 10 minutes, Showa Denko KK) was used. Type: phosphate ester, trade name: TSEP, melting point: 4 degrees Celsius
(2 times, manufactured by Daihachi Chemical Co., Ltd.) 30 parts by weight, and an electric wire was extruded under the same conditions as in Example 7. The oxygen index of the coating material was 21. As a result of the measurement test, it was confirmed that the wear resistance was inferior to that of the example.

(Comparative Example 10) 100 parts by weight of polypropylene ace polypro PY-02 (density: 0.90 g / cm ³ , MI: 1.2 g / 10 minutes, Showa Denko KK) was added to a phosphorus-based flame retardant (type). : Phosphate ester, Product name: CR-733S, Freezing point: Celsius-
(13 degrees, manufactured by Daihachi Chemical Co., Ltd.) 30 parts by weight were mixed, and an electric wire was extruded under the same conditions as in Example 7. The oxygen index of the coating material was 21. As a result of the measurement test, it was confirmed that the wear resistance was inferior to that of the example.

(Comparative Example 11) 7 parts by weight of decabromodiphenyl ether was added to 100 parts by weight of acepolypro PY-02 of polypropylene, and an electric wire was extruded under the same conditions as in Example 7. The oxygen index of the coating material was 22. As a result of the measurement test, it was confirmed that the wear resistance was significantly inferior to the examples.

(Comparative Example 12) 100 parts by weight of polypropylene ace polypro PY-02 was mixed with 50 parts by weight of magnesium hydroxide, and an electric wire was extruded under the same conditions as in Example 7. The oxygen index of the coating material was 23.
As a result of the measurement test, it was confirmed that the wear resistance was significantly inferior to the examples.

(Comparative Example 13) 10 parts by weight of a phosphorus-based flame retardant (type: phosphate ester, trade name: PX201, manufactured by Daihachi Chemical Co., Ltd.) was added to 100 parts by weight of polypropylene Ace Polypro PY-02. The mixture was blended and an electric wire was extruded under the same conditions as in Example 7. The oxygen index of the coating material was 19.5. As a result of the measurement test, it was confirmed that the abrasion resistance, the water resistance and the electric resistance were good, but the flame retardancy was inferior.

(Comparative Example 14) 60 parts by weight of a phosphorus-based flame retardant (type: phosphate ester, trade name: PX201, manufactured by Daihachi Chemical Co., Ltd.) was added to 100 parts by weight of acepolypro PY-02 of polypropylene. The mixture was blended and an electric wire was extruded under the same conditions as in Example 1. The oxygen index of the coating material was 26. As a result of the measurement test, it was confirmed that the flame resistance was good, but the wear resistance, water resistance, and electric resistance were all inferior.

Comparative Example 15 An electric wire was extruded from polypropylene ace polypro PY-02 single material under the same conditions as in Example 1. The oxygen index of polypropylene was 19. As a result of the measurement test, it was confirmed that the wear resistance was considerably inferior to the examples.

Thirdly, specific examples of the present invention including "when the phosphorus-containing flame retardant has a structure containing a nitrogen atom" shown in the chart of FIG. 3 will be described. Each sample (electric wire) was prepared by coating a conductor obtained by twisting seven copper wires having an outer diameter of 0.32 mm with the resin composition shown in the chart of FIG.

(Example 10) 100 parts by weight of polyethylene Hi-Zex 5305E (density: 0.953 g / cm ³ , MI: 0.8 g / 10 minutes, manufactured by Mitsui Petrochemical Industries, Ltd.) was added to a phosphorus-based flame retardant (type: 25 parts by weight of melamine phosphate, trade name: M-PPA, manufactured by Sanwa Chemical Co., Ltd. were mixed and kneaded at a temperature of 180 ° C. with a pressure kneader. The wire was extruded using a Brabender extruder and coated to a thickness of 0.20 mm. Cylinder temperatures C1 to C3 are 130,180,200 degrees Celsius in that order
The temperature of the neck, head and die was set to 200 degrees Celsius. The extrusion speed was 10 m / min. The oxygen index of the coating material was 21. As a result of the measurement test, wear resistance, flame resistance, water resistance, and withstand voltage were all good. In particular, the wear resistance was 1650 times, which was a very good value.

Example 11 100 parts by weight of polypropylene ace polypro PY-02 (density: 0.90 g / cm ³ , MI: 1.2 g / 10 minutes, Showa Denko KK) was added to a phosphorus-based flame retardant (type). : Melamine phosphate, trade name: P-7202, manufactured by Sanwa Chemical Co., Ltd.) 25 parts by weight were mixed, and an electric wire was extruded under the same conditions as in Example 10. The oxygen index of the coating material was 21. Results of measurement test, abrasion resistance, flame resistance, water resistance,
The withstand voltage was all good. In particular, the wear resistance showed a good value of 1580 times.

Example 12 Polymethylpentene TPX DX
-845 (density: 0.835g / cm ³ , MI: 0.8g / 10min, manufactured by Mitsui Petrochemical Co., Ltd.) to 100 parts by weight of phosphorus flame retardant (type: ammonium polyphosphate, trade name: EXOLIT 42
(2, manufactured by Hoechst Co., Ltd.) was mixed, and an electric wire was extruded under the same conditions as in Example 10. The oxygen index of the coating material was 24. Results of measurement test, wear resistance, flame resistance,
Water resistance and withstand voltage were all good. Especially wear resistance is 1
It showed a very good value of 250 times.

(Comparative Example 16) A phosphorus-based flame retardant (type) was added to 100 parts by weight of polypropylene Ace Polypro PY-02 (density: 0.90 g / cm ³ , MI: 1.2 g / 10 minutes, Showa Denko KK). : Phosphate ester, trade name: PX200, manufactured by Daihachi Chemical Co., Ltd.) 20 parts by weight, and an electric wire was extruded under the same conditions as in Example 10. The oxygen index of the coating material was 20.5. As a result of the measurement test, it was confirmed that although the various properties were good, the wear resistance was inferior to the examples.

(Comparative Example 17) 100 parts by weight of ace polypro PY-02 (density: 0.90 g / cm ³ , MI: 1.2 g / 10 minutes, Showa Denko KK) of polypropylene was added to a phosphorus-based flame retardant (type). : Phosphate ester, trade name: PX-201, manufactured by Daihachi Chemical Co., Ltd.) 40 parts by weight, and an electric wire was extruded under the same conditions as in Example 10. The oxygen index of the coating material was 24.5. As a result of the measurement test, it was confirmed that although the various properties were good, the wear resistance was inferior to the examples.

(Comparative Example 18) 100 parts by weight of polypropylene Ace Polypro PY-02 (density: 0.90 g / cm ³ , MI: 1.2 g / 10 minutes, Showa Denko KK) was added to a phosphorus-based flame retardant (type : Phosphate ester, trade name: PX-202, manufactured by Daihachi Chemical Co., Ltd.) 30 parts by weight, and an electric wire was extruded under the same conditions as in Example 10. The oxygen index of the coating material was 23. As a result of the measurement test, it was confirmed that although the various properties were good, the wear resistance was inferior to the examples.

(Comparative Example 19) 100 parts by weight of polypropylene ace polypro PY-02, 7 parts by weight of decabromodiphenyl ether and 2 parts by weight of antimony trioxide were mixed, and an electric wire was prepared under the same conditions as in Example 10. Extruded.
The oxygen index of the coating material was 22. Measurement test results,
It was confirmed that the wear resistance was inferior to the examples.

(Comparative Example 20) 100 parts by weight of polypropylene ace polypro PY-02 was mixed with 50 parts by weight of magnesium hydroxide, and an electric wire was extruded under the same conditions as in Example 10. The oxygen index of the coating material was 23. As a result of the measurement test, it was confirmed that the wear resistance was inferior to the examples.

(Comparative Example 21) 10 parts by weight of a phosphorus-based flame retardant (kind: phosphate ester, trade name: PX-201, manufactured by Daihachi Chemical Co., Ltd.) per 100 parts by weight of polypropylene Ace Polypro PY-02. Parts were blended and an electric wire was extruded under the same conditions as in Example 10. The oxygen index of the coating material was 19.5. As a result of the measurement test, it was confirmed that the abrasion resistance, the water resistance and the withstand voltage were good, but the flame retardancy was inferior.

(Comparative Example 22) 60 parts by weight of a phosphorus-based flame retardant (type: phosphoric acid ester, trade name: PX-201, manufactured by Daihachi Chemical Co., Ltd.) per 100 parts by weight of polypropylene Ace Polypro PY-02. Parts were blended and an electric wire was extruded under the same conditions as in Example 10. The oxygen index of the coating material was 26. As a result of the measurement test, it was confirmed that the flame resistance was good, but the wear resistance, water resistance, and withstand voltage were all inferior.

Comparative Example 23 An electric wire was extruded from polypropylene ace polypro PY-02 single material under the same conditions as in Example 10. The oxygen index of polypropylene was 19. As a result of the measurement test, it was confirmed that flame retardancy and abrasion resistance were considerably inferior.

[0060]

The present invention contains a phosphorus-based flame retardant,
Oxygen index 20 to 25 flame retarded polyolefin,
Since the insulation thickness is 0.30 mm or less,
It is possible to obtain a thin-walled insulated electric wire having significantly improved abrasion resistance and also having good flame resistance, water resistance, and withstand voltage characteristics. Therefore, it can be said that the present invention can greatly contribute to the downsizing of electric wires for equipment, and has an extremely great industrial utility value.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a second embodiment of the present invention.

FIG. 3 is a diagram showing a third embodiment of the present invention.

FIG. 4 is an explanatory front view showing a scrape abrasion test used for measuring the effect of the present invention.

FIG. 5 is an explanatory front view showing a horizontal flame retardant test used for measuring the effect of the present invention.

[Explanation of symbols]

 A Insulator B Conductor 1 Load 2 Blade 3 Marking lamp 4 Battery 5 Gas burner 6 Reduction flame 7 Oxidation flame

Claims (3)

[Claims] 1. An oxygen index of 2 containing a phosphorus-based flame retardant.
A thin-walled insulated wire coated with a flame-retardant polyolefin from 0 to 25 to an insulator thickness of 0.30 mm or less. 2. The thin insulated wire according to claim 1, wherein a phosphorus flame retardant having a melting point of 60 ° C. or higher is used. 3. The thin insulated wire according to claim 1, wherein a phosphorus flame retardant having a structure containing a nitrogen atom is used.