JP2007329012A - Flame-retardant insulated wire and wire harness - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flame-retardant insulated wire that has a double-layered structure in a coating layer of an insulator and is lightweight and excellent in heat resistance, flame retardancy, and mechanical properties or the like. <P>SOLUTION: In the flame-retardant insulated wire, a primary coating layer and a secondary coating layer are applied on a conductor from its inside, the primary coating layer is composed of a flame-retardant insulator that is composed by adding 10-160 pts.mass of a hydrated metal compound to 100 pts.mass of a polyolefin-based resin admixture composed of 80-95 pts.mass of polypropylene and 20-5 pts.mass of polyethylene, and the secondary coating layer is composed of a flame-retardant insulator that is composed by adding 30-50 pts.mass of a triazine-based flame retarder to 100 pts.mass of the polyolefin-based resin admixture composed of 80-95 pts.mass of polypropylene and 20-5 pts.mass of polyethylene. By this, it is possible to obtain the wire that has the double-layered structure in the coating layer of the insulator; and is lightweight and excellent in heat resistance, flame retardancy, and mechanical properties or the like. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a flame-retardant insulated electric wire (including a cable) and a wire harness having a two-layer structure of an insulating coating layer.

  Various wire harnesses are used in automobiles (vehicles) for connection between electrical devices. In the case of this wire harness, various characteristics are required although it varies depending on the use location (part). For example, in recent years it is light in terms of improving the fuel efficiency of vehicles, and is not as high as around the engine room or in the engine room, but it is quite hot under the summer sun in the vehicle side wall, etc., so it can withstand high temperature conditions. Sexuality may be required. In addition, the wire harness itself has high flame resistance that does not cause the spread of fire, there is no generation of toxic gas at the time of ignition or combustion, and the bent part is white at the time of assembly or wiring. It is also necessary that the whitening phenomenon is difficult to occur, and that mechanical strength such as sufficient wear resistance is provided against pulling and rubbing after wiring.

  In such automobile wire harnesses, the most common ones in the past are those using polyvinyl chloride (PVC) as the insulator (coating material) of the constituent insulated wires. However, in the case of vinyl chloride, high flame retardancy can be obtained, but toxic gas (hydrogen chloride) is caused by chlorine element (halogen element) in the resin during combustion at the time of accident or incineration after scrapping. There was a serious drawback of generating gas.

For this reason, various types of non-halogen type resins that do not contain chlorine element have been proposed as base resins for insulators of constituent insulated wires (Patent Documents 1 and 2). For example, polyethylene (PE), ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), ethylene / propylene / gen copolymer (EPDM), polypropylene (PP) Such resins are often used.
Japanese Patent Laid-Open No. 10-294021 JP 2000-086858 A

  However, since these resins are flammable and inferior in flame retardancy compared to polyvinyl chloride, it is necessary to add a flame retardant. Of course, considering the prevention of the generation of toxic gas during combustion, the flame retardant used must be non-halogen. Examples of such a flame retardant include hydrated metal compounds (metal hydrates) such as magnesium hydroxide and aluminum hydroxide. In recent years, these can be used alone or, if necessary, other flame retardants. Such as antimony oxide, zinc borate, and phosphate ester flame retardants.

  However, in the case of a hydrated metal compound, it is necessary to add a considerable amount to the base resin in order to ensure the desired flame retardancy. Of course, the higher the required flame retardancy, the more the additive amount must be increased. As the amount of the hydrated metal compound added increases, there arises a problem that the properties of the insulator by the resin composition, for example, the mechanical strength is lowered. In addition, since the specific gravity of the hydrated metal compound itself is large, the specific gravity (for example, 1.2 or more) of the insulator portion is also increased, which makes it difficult to reduce the weight of the wire harness itself.

  Furthermore, for resins such as polyethylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, and ethylene / propylene / gen copolymer, depending on the specifications of the wire harness, a machine with heat resistance or wear resistance may be used. There was a problem that the strength and the like were insufficient.

  In contrast, polypropylene is relatively inexpensive, has a small specific gravity, is excellent in terms of heat resistance and mechanical strength, and can be said to be a desirable resin, but it is difficult to mix a flame retardant well in production, There were problems such as whitening due to bending.

  Under such circumstances, the present inventors have adopted a two-layer structure as an insulating covering layer in obtaining an automobile wire harness with high heat resistance requirements (such as ISO 6722 standard 85 ° C or 100 ° C heat resistant grade). At the same time, as the base resin of the insulator, polypropylene with excellent heat resistance and wear resistance characteristics is adopted, and by adding an appropriate amount of polyethylene to this, flame retardant smoothness that was difficult with polypropylene alone has been achieved. Mixing was possible.

  Furthermore, when a hydrated metal compound is added to the primary coating layer inside the two-layered insulator to make it flame retardant, while a triazine flame retardant is added to the outer secondary coating layer to make the flame retardant, As a whole, it was found that an electric wire having excellent characteristics can be obtained. In particular, when a large amount of a flame retardant (filler) is added to the resin, not only the mechanical strength such as abrasion resistance is lowered, but also the hot water resistance is lowered due to the penetration of warm water into the interface between the filler and the resin. In the secondary coating layer of the present invention, since the amount of the triazine flame retardant added is in a small range, the polypropylene has excellent characteristics, that is, good heat resistance. It has been found that the properties, wear resistance, hot water resistance, etc. are maintained. It was also found that the whitening phenomenon can be improved by using an appropriate amount of attack polypropylene in combination with the base resin polypropylene.

  The present invention has been made from this point of view. The insulating coating layer has a two-layer structure, is lightweight, has excellent heat resistance, flame resistance, mechanical properties, hot water resistance, and the like. An electric wire and a wire harness can be provided.

  The present invention according to claim 1 is a polyolefin-based resin in which a primary coating layer and a secondary coating layer are applied on the conductor from the inside, and the primary coating layer is composed of 80 to 95 parts by mass of polypropylene and 20 to 5 parts by mass of polyethylene. It consists of a flame retardant insulator in which 100 to 160 parts by mass of a hydrated metal compound is added to 100 parts by mass of the admixture, and the secondary coating layer is composed of 80 to 95 parts by mass of polypropylene and 20 to 5 parts by mass of polyethylene. The flame-retardant flame-retardant insulated electric wire is composed of a flame-retardant insulator in which 30 to 50 parts by mass of a triazine flame retardant is added to 100 parts by mass of the polyolefin resin mixture.

  The present invention according to claim 2 is the flame-retardant insulated electric wire according to claim 1, wherein the hydrated metal compound is magnesium hydroxide.

  The present invention according to claim 3 is the flame-retardant insulated wire according to claim 1, wherein the triazine flame retardant is melamine cyanurate.

  The present invention according to claim 4 is characterized in that, among 80 to 95 parts by mass of the polypropylene, 5 to 30 parts by mass is an attack polypropylene having a surface hardness measured by ASTM-D2240 of 60 or less. It exists in the flame-retardant insulated wire of 2 or 3.

  The present invention according to claim 5 is the flame-retardant insulated electric wire according to claim 1, wherein the polypropylene has a melting point of 160 ° C or higher.

  The present invention according to claim 6 is a wire harness using the flame-retardant flame-retardant insulated electric wire according to any one of claims 1 to 5.

  According to the flame-retardant insulated wire of the present invention, the insulator on the conductor has a two-layer structure, and the inner and outer primary coating layers and secondary coating layers include 80 to 95 parts by mass of polypropylene and 20 to 5 polyethylene as base resins. While using a polyolefin resin mixture consisting of parts by mass, add a hydrated metal compound to the primary coating layer side and a triazine flame retardant to the secondary coating layer to share the role of the flame retardant layer. ing. In particular, in the case of the secondary coating layer, since the amount of the triazine flame retardant added is in a small range, the excellent properties inherent to polypropylene, that is, good heat resistance, wear resistance, hot water resistance, etc. are maintained. It will be. As a result, good characteristics can be obtained for the entire electric wire.

  In addition, the flame retardant hydrated metal compound having a large specific gravity is only added to the primary coating layer side, and if the addition amount is set to be small within the appropriate amount range or the thickness is reduced, etc. It is also possible to satisfactorily suppress an increase in specific gravity. Furthermore, if an appropriate amount of attack polypropylene is used in combination with the base resin polypropylene, the whitening phenomenon can be improved.

  According to the wire harness of the present invention, excellent heat resistance, abrasion resistance, hot water resistance, etc. are maintained by assembling the above-mentioned flame-retardant insulated wire, and an excellent wire that improves the whitening phenomenon Harness is obtained.

  FIG. 1 shows an example of a flame-retardant insulated wire according to the present invention. In the figure, reference numeral 1 denotes a conductor, and reference numerals 2a and 2b denote a primary covering layer and a secondary covering layer formed on the conductor 1, respectively. The conductor 1 can be a single wire, but usually a twisted wire (for example, 19 / 0.12: 19 thin wires having an outer diameter of 0.12 mm) twisted together a plurality of thin wires (for example, tin-plated annealed copper stranded wires). To use).

  For both the primary coating layer and the secondary coating layer, a polyolefin resin mixture is used as the base resin. More preferably, polypropylene is used as a main component and an appropriate amount of polyethylene is added. Specifically, a polyolefin resin mixture composed of 80 to 95 parts by mass of polypropylene and 20 to 5 parts by mass of polyethylene is used. In this blending, the total mass part of polypropylene and polyethylene is 100 parts by mass. And in a primary coating layer, 100-160 mass parts of hydrated metal compounds (metal hydrate) are added with respect to 100 mass parts of polyolefin resin mixture. Moreover, in a secondary coating layer, 30-50 mass parts of triazine flame retardants are added with respect to 100 mass parts of polyolefin resin mixture.

  In this polyolefin resin blend, the main purpose of adding polyethylene to polypropylene is to promote mixing of the flame retardant with polypropylene. By promoting this mixing (blending), deterioration of resin properties can be prevented. Moreover, the hardness of polypropylene itself is relieved and the improvement effect of the whitening phenomenon at the time of a bending is also acquired.

  The amount of polyethylene added is 20 to 5 parts by mass. If the amount exceeds 20 parts by mass, the original properties of polypropylene (mechanical properties such as heat resistance and wear resistance) will be lost. This is because if the amount is less than 5 parts by mass, the effects described above cannot be obtained.

Here, the polypropylene that can be used is not particularly limited, and examples thereof include homopolymers, random copolymers polymerized with ethylene, block copolymers, and mixtures thereof. In actual use, for example, in the case of a wire harness, an appropriate amount may be selected according to required heat resistance specifications (85 ° C or 100 ° C heat-resistant grade of ISO 6722 standard). In order to adapt the wire harness to the heat resistant grade of 85 ° C. or 100 ° C. of ISO 6722 standard, a material having a melting point of 160 ° C. or higher should be used even if polypropylene is used alone or in combination of several kinds. .
Examples of such commercially available products include B701WB (Prime Polymer Co., Ltd., Block PP, melting point 163 ° C., MFR 0.5), E111G (Prime Polymer Co., Ltd., homo PP, melting point 160 to 165 ° C., MFR 0.51), etc. Can be mentioned.

  When a resin composition mainly composed of polypropylene is coated as an insulator for an insulated wire for a wire harness, when a bending stress is applied, a whitening phenomenon occurs in which the surface turns white, depending on the bending curvature. There is. In particular, it is necessary to suppress the occurrence of the whitening phenomenon on the secondary coating layer side that is the surface side of the insulator in the present invention. This whitening phenomenon is improved to some extent by the addition of polyethylene (softening effect), as is apparent from test data described later. The secondary coating layer can also be improved by adding a triazine flame retardant. However, in order to improve more positively, in order to prevent the whitening phenomenon from occurring even when bending with a small curvature, it is preferable that 5 to 30 of the blending amount (80 to 95 parts by mass) of polypropylene. The mass part may be replaced with an attack polypropylene having a surface hardness measured by ASTM-D2240 of 60 or less.

  The effect of preventing the whitening phenomenon can be obtained by this replacement addition. The attack type is soft in characteristic (surface hardness is 60 or less), and is compatible with the amorphous part of the base polypropylene and softens. It is presumed that. Here, the blending amount is set to 5 to 30 parts by mass. If the amount is less than 5 parts by mass, the effect of preventing the whitening phenomenon is hardly obtained, and conversely, if it exceeds 30 parts by mass, the resin This is because the mechanical strength of the material becomes lower. In addition, attack polypropylene is a stereospecific substance of polypropylene in which methyl groups are randomly arranged with respect to the main chain of the polymer, and is usually an oily one. In the present invention, a resin pellet is used. . Examples of the resin pelletized commercial product include T3527 (manufactured by Sumitomo Chemical Co., Ltd.) and T1712 (manufactured by Sumitomo Chemical Co., Ltd.).

  The polyethylene used in the present invention may be any of high density polyethylene (HDPE), medium density polyethylene (MDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), or a mixture thereof. Good. However, in view of the effect of promoting the mixing of the flame retardant, it is desirable to use LDPE or LLDPE which is soft in nature because of its low crystallinity and high acceptability of the flame retardant. Examples of such commercially available products include C150 (manufactured by Ube Maruzen Polyethylene Co., Ltd., LDPE), 2015M (manufactured by Prime Polymer Co., Ltd., LLDPE), and the like.

  Examples of the flame retardant hydrated metal compound added to the primary coating layer in the present invention include magnesium hydroxide, aluminum hydroxide, and calcium hydroxide. These can also be used 1 type or in mixture of 2 or more types. In the case of a hydrated metal compound, a surface treated with a silane coupling agent, a titanate coupling agent, a higher fatty acid or the like is preferable in terms of dispersibility and affinity. This commercially available product includes, for example, Kisuma 5A (manufactured by Kyowa Chemical Industry Co., Ltd., surface-treated with stearic acid), Kisuma 5P (manufactured by Kyowa Chemical Industry Co., Ltd., surface-treated with a silane coupling agent), Kisuma 5 ( Kyowa Chemical Industry Co., Ltd., untreated surface).

  The amount of the hydrated metal compound added is 100 to 160 parts by mass with respect to 100 parts by mass of the polyolefin-based resin admixture, depending on the required flame retardance. In order to pass a heat resistant grade of 100 ° C. or 100 ° C., the desired flame retardancy cannot be obtained if it is less than 100 parts by mass, and if it exceeds 160 parts by mass, the characteristics of the base resin will deteriorate. The reason why the upper limit addition amount can be set larger is that the primary coating layer to which the hydrated metal compound is added is inside the insulator, and some deterioration in resin properties such as wear resistance is allowed. It is. Of course, if the additive amount of the hydrated metal compound is increased in the primary coating layer, high flame retardancy can be ensured accordingly.

  Examples of the triazine flame retardant added to the secondary coating layer in the present invention include melamine cyanurate. In the case of melamine cyanurate, those having a small average particle diameter of 10 μm or less, preferably 7 μm are preferable. Further, those subjected to surface treatment with a higher fatty acid, a silane coupling agent, polyvinyl alcohol, colloidal silica or the like are preferable in terms of dispersibility and affinity for the base resin. Examples of the commercially available products include MC860 (manufactured by Nissan Chemical Industries, surface-treated with polyvinyl alcohol), MC440 (manufactured by Nissan Chemical Industries, Ltd., surface-treated with colloidal silica), and the like.

  The addition amount of the triazine flame retardant is 30 to 50 parts by mass with respect to 100 parts by mass of the polyolefin resin admixture, while ensuring the desired flame retardancy and minimizing adverse effects on the base resin. This is to limit it to the limit. However, if the addition amount is less than 30 parts by mass, the amount is too small to obtain desired flame retardancy, and if it exceeds 50 parts by mass, an adverse effect on the base resin will appear. Since the secondary coating layer to which the triazine flame retardant is added is directly exposed to the outside air, if a large amount of the flame retardant is added, the properties of the resin deteriorate, and hot water enters the boundary between the resin and the filler. It becomes easy and hot water resistance falls. As a result, insulation failure of the insulator occurs.

  The polyolefin-based flame retardant resin composition of the primary coating layer or the secondary coating layer of the present invention having such a composition, according to the application and required specifications, if necessary, an antioxidant, an ultraviolet degradation inhibitor, Additives such as processing aids, color pigments, carbon black and copper damage inhibitors can be added as appropriate.

  In the present invention, in order to produce a wire harness for automobiles using the polyolefin-based flame retardant resin composition of the primary coating layer or the secondary coating layer, first, as a insulator on the conductor by an extruder, The coating layer and the secondary coating layer are extrusion coated. At this time, each of them may be extruded alone, but preferably they are extruded simultaneously. At this time, the thicknesses of both coating layers depend on the outer diameter of the conductor. For example, when the outer diameter of the conductor stranded wire (19 / 0.12) is 1.0 mm, the thickness is about 0.20 to 0.30 mm. It is good to do. Of these, the thickness of the outer secondary coating layer is preferably about 0.10 mm. When the secondary coating layer is thin, scraping properties such as rubbing are reduced. On the other hand, if the secondary coating layer is thick and the primary coating layer is thin, the flame retardancy is lowered. For this reason, it is necessary to adjust the thickness between both coating layers according to a use and a requirement specification. With this configuration, it is possible to obtain a flame-retardant insulated wire having a two-layer structure that is lightweight and has excellent heat resistance, flame retardancy, mechanical properties, and the like. A wire harness for an automobile can be obtained by appropriately assembling a plurality of the flame-retardant insulated wires in accordance with the form of the harness.

  The weight reduction of the flame-retardant insulated wire of this wire harness can be obtained by adjusting the addition amount and thickness of the hydrated metal compound having a large specific gravity only on the primary coating layer side. Of course, the use of polypropylene itself, which is the main component of the base resin, also contributes to this weight reduction. That is, polypropylene is a resin having the lowest specific gravity (about 0.90 to 0.91) among the resins. In addition, the standard of weight reduction is 1.2 or less specific gravity.

  In addition, regarding the overall flame retardancy of this flame retardant insulated wire, the flame retardance on the primary coating layer side by the addition of the hydrated metal compound and the flame retardance on the secondary coating layer side by the addition of the triazine flame retardant Obtained as a synergistic effect. Therefore, the flame retardancy of both coating layers can be appropriately determined according to the application and required specifications. Further, in the case of the secondary coating layer side, the whitening phenomenon can be improved particularly by adding polyethylene or a triazine flame retardant or using an attack polypropylene.

<Examples and comparative examples>
First, a flame retardant insulated wire of a sample having an insulator having a two-layer structure of a primary coating layer and a secondary coating layer using a polyolefin-based flame retardant resin composition having the composition shown in Tables 1 to 4 (Examples 1 to 10, Comparative Examples 1 to 7). The electric wire of each sample has a conductor (19 / 0.12) covered with an insulator having a thickness of 0.25 mm with two layers of a primary coating layer and a secondary coating layer, and an outer diameter of 1.04 mm. Polypropylene of the polyolefin-based flame retardant resin composition used is B701WB (Prime Polymer, Block PP, melting point 163, MFR 0.5), polyethylene is C150 (Ube Maruzen Polyethylene, LDPE), and attack polypropylene is T3527 ( Sumitomo Chemical Co., Ltd.), melamine cyanurate of triazine flame retardant MC860 (Nissan Chemical Industry Co., Ltd., surface treated with polyvinyl alcohol), magnesium hydroxide of hydrated metal compound Kisuma 5A (manufactured by Kyowa Chemical Industry Co., Ltd., Antioxidants are Irganox MD1024 (manufactured by Ciba Specialty Chemicals) and Irganox 1010 (manufactured by Ciba Specialty Chemicals). In addition, the numerical value of the compounding quantity in a table | surface shows a mass part. In the table, the primary coating layer is simply indicated as “primary”, and the secondary coating layer is simply indicated as “secondary”.

  The electric wire of each sample is subjected to a characteristic test, and its characteristics (tensile breaking strength, tensile breaking elongation, flame retardancy, scrape, hot water resistance, whitening phenomenon by bending (bending curvature: φ6 mm, φ3 mm, φ1 mm)) are obtained. It was. Each characteristic was evaluated as follows.

  For <Tensile Breaking Strength>, a tensile breaking strength test was performed at a tensile speed of 200 mm / min and a marked line distance of 20 mm. And when the tensile strength at break was 10 Mpa or more, “pass” was displayed, and less than 10 Mpa was displayed as “fail”.

  For <Tensile rupture elongation>, a tensile rupture elongation test was performed at a tensile rate of 200 mm / min and a marked line length of 20 mm. And when tensile elongation at break was 150% or more, it was displayed as “pass”, and less than 150% was displayed as “fail”.

  For <Flame Retardancy>, a 45 [deg.] Inclined combustion test corresponding to the heat resistant grade of 85 [deg.] C. or 100 [deg.] C. of ISO 6722 standard was performed. And what extinguishes within 70 seconds and the upper 50 mm or more remaining in the 500 mm electric wire is displayed as “pass”, extinguishes in more than 70 seconds, and remains less than 50 mm upper in the 500 mm electric wire Is displayed as “failed”.

  About <scrape>, the test used as an index of abrasion resistance based on JASO-D611 standard was done. That is, a wear test was performed by reciprocating a needle of φ0.45 mm with a load of 7 N on the insulator of the electric wire, and the number of times until the needle contacted the inner conductor at that time was measured. In the actual measurement, in order to eliminate the influence of the uneven thickness of the insulator, it was rotated by 90 ° and the wear test was performed three times from four directions (up, down, left and right) of the outer periphery of the insulator (total 12 times test). The number (average value) of 30 times or more was displayed as “pass”, and less than 30 times was displayed as “fail”.

About <warm water resistance>, the warm water resistance test based on ISO6722 standard was done, and it evaluated by the presence or absence of the dielectric breakdown of an electric wire. That is, a sample electric wire was wound around a 6 mm mandrel and immersed in 1% salt water at 85 ° C., and a direct current of 48 V was charged and continued for 35 days. The volume resistance value (85 ° C) after immersion in warm water is 10 ⁹ Ωmm or more, 1 Kv charge is performed for 1 minute, and even if the pressure is increased to 3 Kv after that, “pass” is displayed. When the volume resistance value (85 ° C.) is less than 10 ⁹ Ωmm or when dielectric breakdown occurs, “fail” is indicated.

  As for <whitening phenomenon>, an electric wire was wound around a mandrel of φ6 mm, φ3 mm, and φ1 mm, and the presence or absence of the whitening phenomenon in the insulator with the corresponding bending curvature was observed.

  As apparent from Tables 1 to 4 above, in the case of the flame-retardant insulated wire of the present invention (Examples 1 to 10), it can be seen that all the characteristics are good. Further, it can be seen that when a large amount of specific-property attack polypropylene is added to the base resin polypropylene (Examples 7 to 9), the whitening phenomenon can be effectively prevented.

On the other hand, in the case of the flame-retardant insulated wire lacking the conditions of the present invention (Comparative Examples 1 to 7), it can be seen that there is a problem in any point.
That is, Comparative Example 1 shows that the flame resistance is insufficient when the secondary coating layer has a small amount of flame retardant (triazine flame retardant). The comparative example 2 is a case where there are many flame retardants of a secondary coating layer, and it turns out that there is a problem in scrape or warm water resistance. The comparative example 3 is a case where there are few flame retardants (hydrated metal compound) of a primary coating layer, and it turns out that flame retardance is inadequate. The comparative example 4 is a case where there are many flame retardants of a primary coating layer, and it turns out that there exists a problem in warm water resistance.

  In Comparative Example 5, it can be seen that there is a problem in the scrape when the amount of addition of attack polypropylene is too large. That is, it can be seen that the excellent wear resistance of polypropylene is reduced. Comparative Example 6 is a case where the base resin is only polypropylene, and it can be seen that there is a problem except for flame retardancy. Comparative Example 7 shows that the amount of polyethylene added to the base resin polypropylene is too large, and there is a problem with the scrape.

1 is a longitudinal end view showing an example of a foamed coaxial cable according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Conductor, 2a ... Primary coating layer, 2b ... Secondary coating layer

Claims (6)

A primary coating layer and a secondary coating layer are applied to the conductor from the inside, and the primary coating layer is water based on 100 parts by mass of a polyolefin resin mixture composed of 80 to 95 parts by mass of polypropylene and 20 to 5 parts by mass of polyethylene. 100 parts by mass of a polyolefin resin mixture comprising a flame retardant insulator to which 100 to 160 parts by mass of a Japanese metal compound is added, and wherein the secondary coating layer is composed of 80 to 95 parts by mass of polypropylene and 20 to 5 parts by mass of polyethylene. A flame retardant insulated wire comprising a flame retardant insulator to which 30 to 50 parts by mass of a triazine flame retardant is added. The flame-retardant insulated wire according to claim 1, wherein the hydrated metal compound is magnesium hydroxide. The flame retardant insulated wire according to claim 1, wherein the triazine flame retardant is melamine cyanurate. 4. The flame retardant according to claim 1, wherein 5 to 30 parts by mass of the polypropylene is an attack polypropylene having a surface hardness measured by ASTM-D2240 of 60 or less. Insulated wire. The flame-retardant insulated electric wire according to claim 1, wherein the polypropylene has a melting point of 160 ° C or higher. A wire harness comprising the flame-retardant insulated electric wire according to any one of claims 1 to 5.

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