JP2013168313A - Insulated wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insulated wire which includes an insulating layer containing a fluororesin, is excellent in wear resistance, and can be reduced in cost.SOLUTION: In the insulated wire, the periphery of a conductor is covered with the insulating layer containing the fluororesin. A component containing the fluororesin and a silica powder and/or a mica powder as a filler is pushed out to the periphery of the conductor to form the insulating layer, thereby constituting the insulated wire.

Description

  TECHNICAL FIELD The present invention relates to an insulated wire, and more particularly to an insulated wire excellent in heat resistance that is suitably used for automobiles, electrical / electronic devices and the like.

  Various properties such as mechanical properties, flame retardancy, heat resistance, and cold resistance are required for members and insulating materials used in automobiles, electrical / electronic devices, and the like. Conventionally, fluororesins have been used for insulated wires by taking advantage of their heat resistance and oil resistance.

  For example, Patent Document 1 describes that a fluororesin is used for an outer layer of an insulated wire.

JP 2010-284895 A

  The conventionally proposed insulated wire including a fluororesin layer has a problem that the cost is high because the fluororesin layer is on the outer layer and a radiation cross-linking type is used.

  When the insulating layer is composed of a single fluororesin layer, the heat resistance and oil resistance are excellent, but there is a problem that the wear resistance is poor.

  The problem to be solved by the present invention is to solve the above problems, and in an insulated wire having an insulating layer containing a fluororesin, the insulated wire has excellent wear resistance and can reduce the cost. Is to provide.

  In order to solve the above problems, an insulated wire of the present invention is an insulated wire in which the periphery of a conductor is covered with an insulating layer containing a fluororesin, and the insulating layer contains silica powder and / or mica powder as a filler. It is intended to contain.

  The said insulated wire WHEREIN: It is preferable that content of the said filler exists in the range of 0.1-100 mass parts with respect to 100 mass parts of said fluororesins.

  The said insulated wire WHEREIN: It is preferable that the surface of the said filler is surface-treated with the fluorine-containing silane coupling agent as a surface treating agent.

  The said insulated wire WHEREIN: It is preferable that the average particle diameter of the said filler is 50 micrometers or less.

  The said insulated wire WHEREIN: It is preferable that the usage-amount of the said surface treating agent is 0.1-10 mass parts with respect to 100 mass parts of said fillers.

  In the insulated wire, the fluororesin is preferably at least one of a fluoroethylene-polypropylene copolymer or an ethylene-tetrafluoroethylene copolymer.

  The insulated wire of the present invention is an insulated wire whose conductor is covered with an insulating layer containing a fluororesin, and the insulating layer contains silica powder and / or mica powder as a filler. In addition to excellent wear resistance, it is possible to reduce costs.

  Further, since the fluororesin has a high extrusion temperature, the filler to be added is also required to have heat resistance, but the silica powder and mica powder have good heat resistance and are not affected by heat during extrusion.

  Hereinafter, embodiments of the present invention will be described in detail. The insulated wire of the present embodiment has a conductor and an insulating layer covering the periphery of the conductor. The insulating layer contains at least one of silica powder and mica powder as a fluororesin and a filler. The insulating layer may use silica powder and mica powder in combination as fillers.

  In the insulated wire of the present invention, it is preferable to form a layer containing a fluororesin as a single layer as an insulating layer. When the insulating layer is a single layer, the cost of equipment for forming the insulating layer is low, and a single insulating layer can be manufactured at a lower cost than a plurality of insulating layers.

  The fluororesin used for the insulating layer is not particularly limited. Examples of the fluororesin include polytetrafluoroethylene (PTFE), fluorinated ethylene-polypropylene copolymer (FEP), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), and ethylene-tetrafluoroethylene copolymer. Examples include coalescence (ETFE). The fluororesin can be appropriately selected according to the heat resistance classification of the insulated wire to be used.

  Fluorine resin is a commercial product, for example, as a trade name of Daikin Industries, Ltd., NP-20, NP-21, NP-30, NP-101 (hereinafter referred to as FEP), AP-201, AP-202, AP-210 ( PFA), EP-506, EP-521, EP-526 (above, ETFE), Asahi Glass Co., Ltd., C-55AP, C88AP, C-55AXP (above, ETFE), CD1, CD141, CD145 ( As described above, PTFE), P-66PT, P-63PT, P-62XPT (hereinafter, PFA) and the like can be used.

  The fluororesin is preferably FEP or ETFE from the viewpoint of cost reduction because the material is inexpensive.

  Silica powder used as a filler in the insulating layer has an effect of improving wear resistance. As the silica, natural silicic acid is used. Examples of natural silicic acid include diatomaceous earth, silica powder, and silica sand. As a commercial product of silica powder, for example, under the trade name of Tatsumorisha, Crystallite 5X (10 μm), Crystallite VX-S2 (5 μm), Cyclos MSR-3500-TN (32 μm), KA-LC-75 (80 μm) ) Etc. can be used. The average particle size is in the parentheses.

  Mica powder used as a filler in the insulating layer has an effect of improving wear resistance. Mica powder is obtained from natural minerals and contains silicon oxide, aluminum oxide, iron oxide and the like as components. Examples of commercially available mica powder include C60M (150 μm), C100M (65 μm), CS-35 (35 μm), and CS-25 (25 μm) under the trade name of Seishin Enterprise. The average particle size is in the parentheses.

  In general, natural mineral powders such as silica powder and mica powder are cheaper than synthetic silicic acid (white carbon) and are advantageous in terms of cost.

  The average particle size of the filler is preferably 50 μm or less. If the average particle size of the filler exceeds 50 μm, the appearance may be poor.

  The amount of the filler added is preferably in the range of 100 to 0.1 parts by mass with respect to 100 parts by mass of the fluororesin. When a filler exceeds 100 mass parts, there exists a possibility that cold resistance may fall. Moreover, if a filler is less than 0.1 mass part, there exists a possibility that the effect which improves abrasion resistance and the effect which reduces cost may not be acquired.

  The filler is preferably surface-treated with a silane coupling agent. When the surface of the filler is surface-treated with a silane coupling agent, the dispersibility with respect to the fluororesin is improved, and the adhesive force with the fluororesin is improved. As a result, characteristics such as cold resistance and wear resistance of the insulated wire can be further improved.

  Examples of the silane coupling agent used for the filler surface treatment include vinyltrimethoxysilane (KBM-1003), 3-glycidoxypropyltrimethoxysilane (KBM-403), 3-methacryloxypropyltrimethoxysilane ( KBM-503), 3-aminopropyltrimethoxysilane (KBM-903), 3-mercaptopropyltrimethoxysilane (KBM-803), bis (triethoxysilylpropyl) tetrasulfide (KBE-846), trifluoropropyltri And methoxysilane (KBM-7103). The names in parentheses are trade names of Shin-Etsu Chemical Co., Ltd. These may be used alone or in combination of two or more.

  As the silane coupling agent, a silane coupling material containing fluorine such as trifluoropropyltrimethoxysilane is preferably used. When the silane coupling agent contains the same fluorine as the resin, a good dispersibility improvement effect can be obtained.

  The method for surface-treating the filler with a silane coupling agent is not particularly limited. As the surface treatment method, for example, a wet process using a solvent or a dry process without using a solvent may be used. In the wet treatment, examples of suitable solvents include fat side solvents such as pentane, hexane, and heptane, and aromatic solvents such as benzene, toluene, and xylene. Moreover, you may mix a silane coupling agent at the time of extrusion of a fluororesin (at the time of insulating layer formation).

  It is preferable that the usage-amount of a silane coupling agent exists in the range of 0.1-10 mass parts with respect to 100 mass parts of fillers. If the amount of the silane coupling agent used is less than 0.1 parts by mass, the effect of improving dispersibility may be insufficient, and if it exceeds 10% by mass, the cost may increase.

  In addition to the fluororesin and the filler, other additives may be added to the insulating layer as long as the characteristics of the insulating layer are not impaired. Examples of such additives include general pigments, antioxidants, lubricants, flame retardants, elastomers and the like used as wire covering materials.

  Hereinafter, the manufacturing method of said insulated wire is demonstrated. An insulated wire is obtained by kneading and uniformly dispersing a composition containing a fluororesin and a filler, and extruding it around a conductor to form an insulating layer.

  As the above kneading method, for example, it is uniform by melting and kneading uniformly with a conventional kneader such as a Banbury mixer, a pressure kneader, a kneading extruder, a biaxial kneading extruder, a roll, and then pelletizing. Can be dispersed.

  The composition of the insulating layer can be uniformly dispersed with a mixer, but the melting point of the fluororesin is high, and it is efficient to mix at the time of extrusion.

  In order to form the insulating layer by extruding the insulating layer composition around the conductor, an electric wire extrusion molding machine or the like used for manufacturing a normal insulated wire can be used. The conductor used for an insulated wire can utilize what is used for a normal insulated wire. Moreover, the diameter of the conductor of an insulated wire, the thickness of an insulating layer, etc. are not specifically limited, According to the use etc. of an insulated wire, it can determine suitably.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  The insulated wire of the present invention can be used for insulated wires used in automobiles, electronic / electrical equipment. It is particularly suitable as an insulated wire for applications that require high heat resistance and flame resistance. For example, in an insulated electric wire for automobiles, applications requiring such high heat resistance include high voltage and large current applications such as a power cable connecting an engine and a battery of a hybrid vehicle or an electric vehicle.

Examples of the present invention and comparative examples are shown below.
[Examples 1-1 to 1-6]
Fluororesin pellets of fluororesins 1 to 4 shown in the component composition of the insulating layer in Table 1 and silica powders 1 to 2 or surface-treated silica powder 1 are dry blended and put into a hopper of an extruder, and thereafter by an extrusion molding machine In Examples 1-1 to 1-6, an insulating layer was formed by extrusion coating on the outer periphery of a conductor (cross-sectional area 0.5 mm ² ) of an annealed copper strand in which seven annealed copper wires were twisted together to a thickness of 0.2 mm. An insulated wire was obtained.

[Examples 2-1 to 2-6]
Except having used the fluororesin pellets of fluororesins 1 to 4 and the mica powders 1 to 2 or the surface-treated mica powder 1 of the component composition of the insulating layer shown in Table 2, the same as in Examples 1-1 to 1-6 Insulating wires of Examples 2-1 to 2-6 were obtained by forming an insulating layer.

[Comparative Examples 1-4]
Insulation of Comparative Examples 1 to 4 was performed by forming an insulating layer in the same manner as in Examples 1-1 to 1-4 except that the fluororesin pellets of fluororesins 1 to 4 having the component composition of the insulating layer shown in Table 3 were used. I got an electric wire.

  The insulated wires of Examples 1-1 to 1-6, 2-1 to 2-6, and Comparative Examples 1 to 4 were evaluated by performing a cold resistance test and an abrasion test. The result is shown according to Tables 1-3. In addition, each component composition of Tables 1-3, the test method, and the evaluation method are as follows.

[Ingredients in Tables 1 to 3]
・ Fluorine resin 1: Product name NP20, manufactured by Daikin
-Fluororesin 2: manufactured by Daikin, trade name AP-201
・ Fluorine resin 3: Asahi Glass Co., Ltd., trade name C-55AP
・ Fluorine resin 4: Asahi Glass Co., Ltd., trade name P-66PT
Silica powder 1: manufactured by Tatsumori Co., Ltd., trade name: Kicross MSR-350-TN (average particle size 32 μm)
-Silica powder 2: manufactured by Tatsumori Co., Ltd., trade name Kikurosu KA-LC-75 (average particle size 85 μm)
Surface treated silica powder 1: Silica powder 1 treated with 5% silane coupling agent
As the silane coupling agent, trade name KBM7103 (trifluoropropyltrimethoxysilane) manufactured by Shin-Etsu Chemical Co., Ltd. was used. In addition, the usage-amount of a silane coupling agent is 5 mass% with respect to the total amount of a silica and a silane coupling agent.
-Mica powder 1: manufactured by Seishin Enterprise Co., Ltd., trade name CS-25 (average particle size 25 μm)
-Mica powder 2: manufactured by Seishin Enterprise Co., Ltd., trade name C-100M (average particle size 65 μm)
Surface-treated mica powder 1: Mica powder 1 treated with 5% silane coupling agent
As the silane coupling agent, trade name KBM7103 (trifluoropropyltrimethoxysilane) manufactured by Shin-Etsu Chemical Co., Ltd. was used. In addition, the usage-amount of a silane coupling agent is 5 mass% with respect to the total amount of mica and a silane coupling agent.

[Cold resistance test method]
This was performed in accordance with JIS C3055. That is, the insulated wires of Examples and Comparative Examples were cut out to a length of 38 mm to obtain test pieces. The test piece was mounted on a cold resistance tester, cooled to a predetermined temperature, hit with a hitting tool, and the state after hitting the test piece was observed. Using five test pieces, the temperature at which all five test pieces were broken was defined as the cold resistant temperature.

[Abrasion test method]
The abrasion resistance tester was tested by the blade reciprocation method in accordance with the Japan Society of Automotive Engineers standard “JASO D618”. That is, the insulated wires of Examples and Comparative Examples were cut out to a length of 750 mm to obtain test pieces. Then, the blade was reciprocated at a speed of 50 times per minute on the surface of the insulating layer at a length of 10 mm or more in the axial direction at room temperature of 23 ± 5 ° C., and the number of reciprocations until contact with the conductor was measured. At this time, the load applied to the blade was 7N. About the number of times, the thing of 200 times or more was made into (circle) (pass), the thing of 300 times or more was made into (good), and the thing less than 200 was made into x (failed).

  Since the insulated wires of Examples 1-1 to 1-6 and 2-1 to 2-6 contain fillers as shown in Tables 1 and 2, cold resistance is -20 ° C or lower. Further, the wearability was acceptable or good. On the other hand, as shown in Table 3, the insulated wires of Comparative Examples 1 to 4 have a good cold resistance of −45 ° C. or less, but the fillers are not contained, so that the evaluation of wearability was unacceptable.

Claims (6)

  An insulated wire in which a conductor is covered with an insulating layer containing a fluororesin, and the insulating layer contains silica powder and / or mica powder as a filler.   The insulated wire according to claim 1, wherein a content of the filler is in a range of 0.1 to 100 parts by mass with respect to 100 parts by mass of the fluororesin.   The insulated wire according to claim 1, wherein the surface of the filler is surface-treated with a fluorine-containing silane coupling agent as a surface treatment agent.   The insulated wire according to claim 1, wherein the filler has an average particle size of 50 μm or less.   The insulated wire according to claim 3, wherein the amount of the surface treatment agent used is 0.1 to 10 parts by mass with respect to 100 parts by mass of the filler. The insulated wire according to claim 1, wherein the fluororesin is at least one of a fluoroethylene-polypropylene copolymer or an ethylene-tetrafluoroethylene copolymer.