JP2012182036A - Insulation wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insulation wire capable of reducing environmental loads using renewable biomass resources and excellent in water resistance even when biomass resources are used.SOLUTION: In an insulation wire including a conductor and an insulator covering an outer periphery of the conductor, the insulator comprises a resin composition containing plant-derived polyamide and a vinyl chloride resin. The plant-derived polyamide preferably has a melt flow rate at 230°C and 21.18 N in a range of 0.1-50 g/10 min, the melt flow rate being measured in accordance with ASTM D1238.

Description

  The present invention relates to an insulated wire, and more particularly to an insulated wire suitable for automobiles, electrical / electronic devices, and the like.

2. Description of the Related Art Conventionally, for insulated wires wired to automobiles, electric / electronic devices, and the like, those using a resin made of fossil resources (petroleum resources) such as polyolefin as an insulator (insulation coating) are known. . As is well known, fossil resources are limited resources. In addition, incineration and disposal of products produced from fossil resources will lead to an increase in atmospheric CO ₂ concentration.

Recently, biomass resources have attracted attention because of consideration for the global environment. Biomass resources are resources that can be regenerated in a relatively short period of time, derived from modern organisms such as plants. Moreover, since carbon contained in biomass resources is derived from CO ₂ absorbed from the atmosphere by photosynthesis during the growth process, the biomass resources have a surface that maintains a balance of CO ₂ concentration in the atmosphere. Furthermore, since many biomass resources are biodegradable, biomass plastic products produced from biomass resources may be landfilled after use. Above all, the use of fossil resources can be reduced by using biomass resources. Therefore, environmental load can be reduced by using biomass resources.

  Conventionally, such biomass plastics have been attempted mainly for use in molded parts due to their mechanical properties, but not much attempts have been made in the field of electric wires such as automobiles (Patent Document 1, etc.).

JP 2007-191547 A

  When using biomass plastic in the field of electric wires such as automobiles, it is required to have water resistance in addition to various mechanical properties required for electric wires because of the particularity of the location where the electric wires are routed. However, many biomass plastics are made of polyester or cellulose, and the present situation is that these plastics do not have sufficient water resistance due to their molecular structure.

  The problem to be solved by the present invention is to provide an insulated wire that is excellent in water resistance even when a biomass resource is used while reducing the environmental load using a renewable biomass resource.

  In order to solve the above problems, an insulated wire according to the present invention is an insulated wire comprising a conductor and an insulator covering the outer periphery of the conductor, wherein the insulator contains a plant-derived polyamide and a vinyl chloride resin. The gist of the invention is that it comprises a resin composition.

  Under the present circumstances, it is preferable that the melt flow rate in 230 degreeC and 21.18N measured based on ASTM D1238 of the said plant-derived polyamide exists in the range of 0.1-50 g / 10min.

  According to the insulated wire according to the present invention, since the insulator is composed of the resin composition containing the plant-derived polyamide and the vinyl chloride resin, it is possible to reduce the environmental load. Moreover, unlike the biomass plastic which consists of polyester and a cellulose, this plant-derived polyamide is hard to hydrolyze and has water resistance. Therefore, even when biomass plastic is used, the water resistance is excellent.

  At this time, if the melt flow rate at 230 ° C. and 21.18 N measured in accordance with ASTM D1238 of the plant-derived polyamide is within a specific range, the compatibility with the vinyl chloride resin used together increases, It is difficult to reduce cold resistance.

  Next, an embodiment of the present invention will be described in detail.

   The insulated wire according to the present invention includes a conductor and an insulator covering the outer periphery of the conductor. The conductor is composed of a metal wire, a metal stranded wire, or the like. Examples of the metal of the conductor include copper, copper alloy, aluminum, and aluminum alloy.

  The insulator is made of a specific resin composition (hereinafter sometimes referred to as the present composition) containing a plant-derived polyamide and a vinyl chloride resin.

  The plant-derived polyamide can be made from, for example, castor oil collected from castor bean. From this castor oil, 11-aminoundecanoic acid can be synthesized. Plant-derived polyamide can be obtained by polymerizing the obtained 11-aminoundecanoic acid.

  Since plant-derived polyamide is not derived from crude oil, it suppresses the increase in carbon dioxide from the viewpoint of carbon neutrality. Plant-derived polyamides are plant-derived, but are not biodegradable. For this reason, it is excellent in durability compared with other biodegradable biomass plastics. Moreover, it is excellent also in water resistance.

  Specific examples of the plant-derived polyamide include BESV O FDA, BESN O P40 TL, BESN O P20 TL, BESN O TL, BECN O TL, and BMN O TLD from Arkema. These can be used alone or in combination of two or more.

  The plant-derived polyamide preferably has a melt flow rate at 230 ° C. and 21.18 N measured in accordance with ASTM D1238 in the range of 0.1 to 50 g / 10 minutes. When the melt flow rate of the plant-derived polyamide is within a specific range, the compatibility with the vinyl chloride resin used together increases, so that the cold resistance can be hardly lowered. From this viewpoint, it is more preferably in the range of 0.2 to 45 g / 10 minutes, and still more preferably in the range of 0.3 to 40 g / 10 minutes.

  The melt flow rate of the plant-derived polyamide exemplified is as follows. That is, BESV O FDA: 0.5 g / 10 min, BESN O P40 TL: 0.1 g / 10 min, BESN O P20 TL: 0.05 g / 10 min, BESN O TL: 1.0 g / 10 min, BECN O TL: 30 g / 10 min, BMN O TLD: 55 g / 10 min.

  The content of the plant-derived polyamide is not particularly limited, but may be about 10 to 50% by mass as a ratio in the resin component of the composition. Since this composition contains plant-derived polyamide, it can contribute to reduction of an environmental burden. When the content of the plant-derived polyamide exceeds 50% by mass in the resin component of the composition, the plant-derived polyamide has a melt flow rate of less than 0.1 g / 10 minutes or more than 50 g / 10 minutes. Then, the cold resistance tends to decrease.

  A commercially available thing can be used for the vinyl chloride resin used with plant-derived polyamide. As such a thing, the "Eraslen" series made by Showa Denko KK, the "Luron" series made by Taiyo PVC, etc. can be mentioned. These may be used alone or in combination of two or more.

  The vinyl chloride resin may contain a plasticizer. Examples of the plasticizer include dimethyl phthalate (DMP), diethyl phthalate (DEP), dibutyl phthalate (DBP), diisodecyl phthalate (DINP), and di-2-ethylhexyl phthalate (DOP).

  Since this composition contains a vinyl chloride resin, it can suppress a decrease in water resistance and also has good flame retardancy. For this reason, even if it does not mix | blend a flame retardant, the flame retardance calculated | required as an insulated wire used for vehicles, such as a motor vehicle, can fully be ensured. Or the compounding quantity of a flame retardant can be reduced as much as possible. Therefore, an increase in cost due to the blending of the flame retardant can be suppressed.

  From the viewpoint of ensuring such flame retardancy, the content of the vinyl chloride resin is preferably 10% by mass or more as a ratio in the resin component of the present composition. More preferably, it is 15 mass% or more, More preferably, it is 20 mass% or more. On the other hand, the upper limit of the content of the vinyl chloride resin is not particularly limited, but from the viewpoint of reducing the environmental burden using renewable biomass resources, the ratio in the resin component of the composition 90% by mass or less is preferable. More preferably, it is 85 mass% or less.

  In the present composition, in addition to the above resin components, other resin components may be contained as necessary within a range not impairing the physical properties. Examples of other resin components include other olefin resins. Examples of other olefinic resins include those derived from crude oil. Even when such other olefin-based resins are included, a decrease in water resistance can be suppressed.

  Other olefin-based resins include polyolefins such as polyethylene and polypropylene, ethylene copolymers such as ethylene-vinyl acetate copolymer (EVA) and ethylene-ethyl acrylate copolymer (EEA), and propylene-vinyl acetate copolymer. Examples thereof include a polymer and a propylene copolymer such as a propylene-ethyl acrylate copolymer. Examples of polyethylene include low density polyethylene, high density polyethylene, linear low density polyethylene, and metallocene polyethylene. Examples of polypropylene include homopolypropylene, block polypropylene, and random polypropylene. Other olefin-based resins may be modified with an acid anhydride or carboxylic acid, or may not be modified.

  Another olefin-based resin is polypropylene from the viewpoint of obtaining a composition having excellent wear resistance. Particularly preferable is a block copolymer with polyethylene (block polypropylene) from the viewpoint of obtaining a composition having an excellent balance between cold resistance and wear resistance.

  In the present composition, in addition to the above components, additives can be appropriately blended as necessary within a range not impairing physical properties. Examples of additives include flame retardants, antioxidants, copper damage inhibitors (metal deactivators), UV absorbers, UV masking agents, processing aids (such as waxes), pigments, compatibilizers, and plasticizers. And so on.

  The flame retardant that can be blended as an additive of the present composition is not particularly limited. For example, metal hydrates such as magnesium hydroxide and aluminum hydroxide, nitrogen flame retardants such as melamine isocyanurate, halogen flame retardants such as ethylene bis (tetrabromobenzene) and ethylene bis (pentabromobenzene), etc. be able to. The amount of these flame retardants can be determined as appropriate.

  The insulated wire according to the present invention can be produced, for example, by extruding the composition on the outer periphery of a conductor. The preparation method of this composition is not specifically limited, A well-known method can be used. For example, the essential components and optional additional components of the present composition are melt-kneaded and uniformly dispersed in a conventional kneader such as a Banbury mixer, a pressure kneader, a kneading extruder, a twin-screw kneading extruder, and a roll. A composition can be prepared.

  In the insulated wire according to the present invention having the above-described configuration, since the polyamide obtained from biomass resources is used as the material constituting the insulator, the amount of fossil resources used can be reduced compared to conventional insulated wires. Biomass resources are resources that can be regenerated in a relatively short period of time compared to fossil resources, and have carbon neutral properties. Therefore, according to the insulated wire which concerns on this invention, reduction of an environmental load can be aimed at rather than before.

  Further, in the present invention, since the polyamide itself obtained from biomass resources has water resistance, even when biomass resources are used as a material constituting the insulator, the water resistance of the insulator is not lowered. can do. In addition, since a vinyl chloride resin is used as a material constituting the insulator, the water resistance of the insulator is not lowered and excellent water resistance is exhibited.

  EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto.

(Examples 1 to 11)
After adding a plant-derived polyamide component, a vinyl chloride resin component, and additives so as to have the component composition (parts by mass) shown in Table 1, the mixture is mixed at 200 ° C. using a twin-screw kneader, and then pelletized by a pelletizer. The resin composition pellets were obtained. The pellets were extruded by an extruder at a thickness of 0.2 mm onto the outer periphery of a annealed copper stranded wire conductor (cross-sectional area: 0.5 mm ² ) in which seven annealed copper wires were twisted together, and the conductor was formed by an insulator made of a resin composition. The insulated wire which concerns on Examples 1-11 with which was covered was obtained.

(Comparative Examples 1-7)
The composition of the insulator was formed using other biomass plastics and additives described in Table 2, and the insulated wires according to Comparative Examples 1 to 7 were obtained in the same manner as in the Examples.

  Using the insulated wires obtained in Examples and Comparative Examples, a cold resistance test and a water resistance test were performed. The test results are shown in Tables 1-2. The cold resistance test method and the water resistance test method are as follows.

[Cold resistance test method]
This was performed in accordance with JIS C3005. That is, the insulated wires of Examples and Comparative Examples were cut into 38 mm lengths to make test pieces, the test pieces were mounted on a cold resistance tester, cooled to a predetermined temperature, hit with a hitting tool, The condition after hitting was observed. Using five test pieces, the temperature at which all five test pieces were broken was defined as the cold resistant temperature.

[Water resistance test method]
In accordance with ISO 6722, the insulated wires of Examples and Comparative Examples were immersed in warm water at 80 ° C. for 5 weeks, and then the insulation resistance value of the insulator was measured. A sample having an insulation resistance value of 1 × 10 ⁹ Ω · mm or more was evaluated as “good”, and a sample having an insulation resistance value of less than 1 × 10 ⁹ Ω · mm was determined as “failed”.

(Plant-derived polyamide component)
All are made by Arkema, Inc. · BESV O FDA: 0.5 g / 10 min · BESN O P40 TL: 0.1 g / 10 min · BESN O P20 TL: 0.05 g / 10 min · BESN O TL: 1.0 g / 10 Minutes · BMN O TLD: 55 g / 10 minutes · BECN O TL: 30 g / 10 minutes

(Vinyl chloride resin component)
・ Elasticene 301A, 303B: Showa Denko ・ Luron E-1700, E-2200: Taiyo PVC

(Other biomass plastic components)
・ Polylactic acid (V351X51): manufactured by Toray Industries, Inc. ・ Polylactic acid (V554R10): manufactured by Toray Industries, Inc. ・ Polylactic acid (TCA8070MN): manufactured by Unitika ・ Cellulose acetate (15300-26): manufactured by Daicel Corporation ・ Cellulose acetate (15300-31) : Manufactured by Daicel, Inc./polybutylene succinate (NF01U): manufactured by Chemtech, Inc./polybutylene succinate (Bionore 1020): manufactured by Showa Polymer Co., Ltd.

(Additive component)
Antioxidant (Irganox 1010): manufactured by Ciba Specialty Chemicals

  The comparative example is inferior in water resistance because the resin component consists only of a biomass plastic component composed of polylactic acid, cellulose acetate, and polybutylene succinate. On the other hand, since the resin component consists of a plant-derived polyamide component and a vinyl chloride resin component, it can be seen that the examples are excellent in water resistance while maintaining cold resistance.

  Therefore, according to the insulated wire which concerns on this invention, while being able to aim at reduction of an environmental load using the renewable biomass resource, it has confirmed that the insulated wire excellent in water resistance was obtained also in this case.

  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.

Claims (3)

In an insulated wire comprising a conductor and an insulator covering the outer periphery of the conductor,
The insulated wire is characterized in that the insulator is made of a resin composition containing a plant-derived polyamide and a vinyl chloride resin.   The insulated wire according to claim 1, wherein the plant-derived polyamide is a polyamide obtained by polymerizing 11-aminoundecanoic acid.   3. The melt flow rate at 230 ° C. and 21.18 N measured in accordance with ASTM D1238 of the plant-derived polyamide is in the range of 0.1 to 50 g / 10 minutes. Insulated wire as described.