JP6206172B2 - Anticorrosion composition and coated electric wire with terminal - Google Patents

Description

  The present invention relates to an anticorrosive composition and a coated electric wire with a terminal, and more particularly relates to an anticorrosive composition excellent in an anticorrosive property of an electric connection portion between an electric wire conductor and a terminal fitting, and a coated electric wire with a terminal.

  A terminal fitting is connected to the wire conductor at the end of the covered wire that is routed in a vehicle such as an automobile. In order to prevent corrosion at the electrical connection portion where the terminal fitting and the wire conductor of the covered electric wire are electrically connected, for example, Patent Document 1 discloses a connector in which the terminal fitting connected to the wire conductor is inserted and locked. A technique for injecting grease is disclosed.

Japanese Patent Laid-Open No. 05-159846

  In recent years, for the purpose of reducing the weight of a vehicle such as an automobile, the use of aluminum or an aluminum alloy as a material for a wire conductor has been studied. On the other hand, copper or a copper alloy is often used as a material for the terminal fitting. Further, the surface of the terminal fitting is often subjected to plating such as tin plating. In other words, the wire conductor and the terminal fitting may be made of different materials. If the wire conductor and the terminal fitting are made of different materials, corrosion due to contact with different metals occurs at the electrical connection portion. For this reason, it is calculated | required that an electrical connection part should carry out corrosion prevention reliably.

  Conventionally used grease cannot prevent the ingress of water unless it is densely injected into the connector. If it is injected excessively, it will protrude from the connector and stick the wires and connectors, reducing the handleability. In addition, when the electric wire is bent in the process from manufacture of the wire harness to attachment to the vehicle, a gap is formed between the electric wire coating and the grease, and the waterproofness and the anticorrosion function are impaired.

  The problem to be solved by the present invention is to provide an anticorrosive composition having excellent anticorrosion performance and a coated electric wire with a terminal using the same.

In order to solve the above-described problems, the anticorrosive composition according to the present invention includes the following components (A) to (C).
(A) Elastomer having a butene skeleton or a butane skeleton and a ratio of 70% by mass or more (B) (meth) acrylic monomer or (meth) acrylic oligomer liquid at 25 ° C. (C) polymerization initiator

  In this case, it is preferable that the overlapping tensile shear strength of aluminum measured in accordance with JIS K6850 after curing is 20 kPa or more.

  The component (A) is preferably at least one of polybutene, polybutadiene, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, and ethylene-butadiene copolymer.

  Moreover, it is preferable that content of the said (A) component exists in the range of 1-30 mass%.

  Furthermore, it is preferable that the viscosity in 25 degreeC measured based on JISZ8803 is in the range of 500-10000 mPa * s.

  Further, it may contain a tackifier comprising at least one of rosin, terpene, terpene phenol, phenol, chromanindene resin, and petroleum resin.

  And the covered electric wire with a terminal which concerns on this invention is an insulation of the said electric wire conductor containing the electrical connection part to which the terminal metal fitting and the electric wire conductor of the covered electric wire were electrically connected by the hardened | cured material of said anticorrosion composition. The gist is that the range from the surface of the terminal fitting ahead of the tip of the portion exposed from the coating to the surface of the insulation coating behind the rear end of the portion exposed from the insulation coating of the wire conductor is covered. It is.

  According to the anticorrosive composition according to the present invention, the cured product is excellent in adhesion with the insulation coating of the coated electric wire and adhesion with the terminal metal fitting. When a predetermined range including the electrical connection portion electrically connected to is covered with the cured product, water intrusion into the electrical connection portion can be suppressed. For this reason, it is excellent in anticorrosion performance.

  Moreover, according to the coated electric wire with a terminal according to the present invention, the electrical connection in which the terminal fitting of the coated electric wire with the terminal and the electric wire conductor of the coated electric wire are electrically connected by the cured product of the anticorrosive composition according to the present invention. Since the predetermined range including the portion is covered, the anticorrosion performance is excellent.

It is an external appearance perspective view of an example of the covered electric wire with a terminal of the present invention. FIG. 2 is a longitudinal sectional view taken along line AA in FIG. 1.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The anticorrosive composition according to the present invention contains the following components (A) to (C).
(A) Elastomer having a butene skeleton or a butane skeleton and a ratio of 70% by mass or more (B) (meth) acrylic monomer or (meth) acrylic oligomer liquid at 25 ° C. (C) polymerization initiator

  The component (A) is an elastomer having a butene skeleton or a butane skeleton. Due to the butene skeleton or the butane skeleton, the component (A) has adhesiveness. Thereby, a composition is excellent in adhesiveness with the insulation coating of a covered electric wire. If the adhesion with the insulating coating is ensured, for example, there is an effect of suppressing the generation of a gap between the composition and the insulating coating even when the coated electric wire is bent. From this viewpoint, the ratio of the butene skeleton or the butane skeleton in the component (A) is 70% by mass or more. When the ratio of the butene skeleton or the butane skeleton is low, it is difficult to ensure adhesion.

  Examples of the elastomer having a butene skeleton or a butane skeleton include polymers in which butene and butadiene are contained in the raw material. Specific examples include polybutene, polybutadiene, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, and ethylene-butadiene copolymer. (A) component may be comprised only with 1 type of these, for example, and may be comprised with the combination of 2 or more types of these.

  In the case where the insulating coating is made of a resin having a relatively low polarity such as polyolefin, the adhesiveness can be further improved from the compatibility. Therefore, the component (A) is a polymer containing a relatively large amount of butene, butadiene and ethylene in the raw material. Is preferred. Specifically, polybutene, polybutadiene, ethylene-butadiene copolymer and the like are preferable. On the other hand, when the insulating coating is made of a resin having a relatively high polarity such as polyvinyl chloride, the compatibility can be improved from the compatibility, so that the component (A) is made from a copolymer component such as styrene or acrylonitrile. Polymers included are preferred. Specifically, a styrene-butadiene copolymer, an acrylonitrile-butadiene copolymer, and the like are preferable.

  The elastomer having a butene skeleton or a butane skeleton preferably has an elastic modulus of 10 MPa or less from the viewpoint of providing adhesiveness. More preferably, it is 5 MPa or less, More preferably, it is 1 MPa or less. The elastic modulus is a tensile elastic modulus measured according to JIS K7161. In order to obtain a predetermined elastic modulus, for example, the molecular weight of an elastomer having a butene skeleton or a butane skeleton may be relatively small.

  The content of the component (A) is preferably in the range of 1 to 30% by mass from the viewpoint that the adhesiveness of the composition can be increased. More preferably, it exists in the range of 5-25 mass%, More preferably, it exists in the range of 10-20 mass%.

  The component (B) is a (meth) acrylic monomer or (meth) acrylic oligomer that is liquid at 25 ° C. Since the component (B) has a (meth) acrylic group, the adhesiveness to the metal is high, and the adhesiveness to the terminal fitting and the electric wire conductor is excellent. For this reason, adhesiveness with a terminal metal fitting or an electric wire conductor is securable.

  Moreover, since the component (B) is liquid at 25 ° C., the composition can be easily applied to the surface of the wire conductor, the surface of the insulating coating, and the surface of the terminal fitting. Moreover, it makes it easy to osmose | permeate a composition between the strands of an electric wire conductor, between an electric wire conductor and a terminal metal fitting, and between an electric wire conductor and insulation coating. For this reason, the workability | operativity of a composition and corrosion resistance can be improved. Since the component (B) is liquid at 25 ° C., the composition can be applied at room temperature. This makes it possible to apply the composition without heating. However, the composition may be applied without heating, may be applied by heating to adjust the viscosity, or may be applied after being dissolved in an appropriate solvent.

  Further, the component (B) is a (meth) acrylic monomer or a (meth) acrylic oligomer and is used in combination with the component (C), so that the composition can be cured after coating. For this reason, the applicability | paintability and shape stability of a composition can be made compatible.

  The (meth) acryl monomer may be mono (meth) acrylate or poly (meth) acrylate. A combination of these may also be used.

  Mono (meth) acrylates include isobornyl (meth) acrylate, bornyl (meth) acrylate, tricyclodecanyl (meth) acrylate, dicyclopentanyl (meth) acrylate, dicyclopentenyl (meth) acrylate, cyclohexyl (meth) Acrylate, (meth) acrylic acid, benzyl (meth) acrylate, 4-butylcyclohexyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, Methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, octyl (meth) acrylate, isooctyl (meth) acrylate, noni (Meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, undecyl (meth) acrylate, dodecyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, isostearyl (meth) acrylate, tetrahydrofur Furyl (meth) acrylate, polyethylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, methoxyethylene glycol (meth) acrylate, ethoxyethyl (meth) acrylate, methoxypolyethylene glycol (meth) acrylate, methoxypolypropylene glycol (meta ) Acrylate, polyoxyethylene nonylphenyl ether acrylate and the like.

  Poly (meth) acrylates include butanediol di (meth) acrylate, hexanediol di (meth) acrylate, nonanediol di (meth) acrylate, decanediol di (meth) acrylate, 2-butyl-2-ethyl-1, 3-propanediol di (meth) acrylate, 2-hydroxy-3-acryloyloxypropyl methacrylate, dipropylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, tetra Ethylene glycol di (meth) acrylate, tricyclodecane dimethylol di (meth) acrylate, 1,4-butanepolyol di (meth) acrylate, 1,6-hexanepolyol di (meth) acrylate, neope Til glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, 9,9-bis [4- (2-acryloyloxyethoxy) phenyl] fluorene, polyester di (meth) acrylate, Tris (2-hydroxyethyl) isocyanurate tri (meth) acrylate, tris (2-hydroxyethyl) isocyanurate di (meth) acrylate, tricyclodecane dimethylol di (meth) acrylate, bis-phenol A EO adduct di (meth) Epoxy (meth) acrylate in which (meth) acrylate is added to diglycidyl ether of acrylate, hydrogenated bisphenol A EO adduct or PO adduct polyol diglycidyl ether , Triethylene glycol divinyl ether, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, trimethylolpropane EO adduct tri (meth) acrylate, trisacryloyloxyethyl phosphate, pentaerythritol tetra ( (Meth) acrylate, tetrafurfuryl alcohol oligo (meth) acrylate, ethyl carbitol oligo (meth) acrylate, 1,4-butanediol oligo (meth) acrylate, 1,6-hexanediol oligo (meth) acrylate, trimethylolpropane Oligo (meth) acrylate, pentaerythritol oligo (meth) acrylate, (poly) urethane (meth) acrylate, (poly) butadiene (meth) acrylate And the like.

  Component (C) is a polymerization initiator for component (B). The component (C) may be a photopolymerization initiator that cures the component (B) with light such as ultraviolet rays, a thermal polymerization initiator that cures the component (B) with heat, or both. It may be.

  The photopolymerization initiator is not particularly limited as long as it is a compound that absorbs ultraviolet rays to initiate radical polymerization, and a conventionally known photopolymerization initiator can be used. Specifically, 1-hydroxycyclohexyl phenyl ketone, 2,2-dimethoxy-2-phenylacetophenone, xanthone, fluorenone, benzaldehyde, fluorene, anthraquinone, ethylanthraquinone, triphenylamine, carbazole, 3-methylacetophenone, 4-chloro Benzophenone, 4,4′-dimethoxybenzophenone, 4,4′-diaminobenzophenone, Michler's ketone, benzoin propyl ether, benzoin ethyl ether, benzyl dimethyl ketal, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropane- 1-one, 2-hydroxy-2-methyl-1-phenylpropan-1-one, thioxanthone, diethylthioxanthone, 2-isopropylthioxanthone, 2-c Rothioxanthone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propan-1-one, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, bis- (2,6-dimethoxybenzoyl) ) -2,4,4-trimethylpentylphosphine oxide. These may be used alone or in combination of two or more.

  As thermal polymerization initiators, azoisobutyl nitrile (AIBN), benzoyl peroxide (BPO), lauroyl peroxide, acetyl peroxide, methyl ethyl ketone peroxide, cumene hydroperoxide, di-tert-butyl peroxide, tert-butyl peroxide Examples thereof include peroxides such as benzoate and cyclohexanone peroxide.

  Although content of (C) component is not specifically limited, From viewpoints, such as sclerosis | hardenability of a composition, it is preferable to exist in the range of 0.001-10 mass%. More preferably, it exists in the range of 0.01-10 mass%, More preferably, it exists in the range of 0.01-5 mass%.

  In the composition for anticorrosion which concerns on this invention, you may contain the additive in the range which does not inhibit this invention other than said (A)-(C) component. Additives include tackifiers, hydroquinone, mercaptans and other stabilizers, molecular weight regulators, viscosity modifiers such as fine silica, leveling agents, antioxidants, metal deactivators, flame retardants, flame retardant aids , Coloring pigments, dyes, dispersants and the like.

  Examples of the tackifier include rosin, terpene, terpene phenol, phenol, chromanindene resin, petroleum resin and the like. Petroleum resins include aliphatic, alicyclic, hydrogenated, styrene, and alkylphenol types. As the tackifier, one of these may be used, or two or more may be used in combination.

  The content of the tackifier is preferably in the range of 1 to 30% by mass from the viewpoint that the adhesiveness of the composition can be increased. More preferably, it exists in the range of 5-30 mass%, More preferably, it exists in the range of 10-25 mass%.

  The anticorrosive composition according to the present invention may or may not use a solvent, but is preferably liquid at 25 ° C. from the viewpoints of applicability (constructability) and anticorrosion. In this case, the viscosity of the anticorrosive composition is preferably in the range of 500 to 10,000 mPa · s. The viscosity of the anticorrosive composition is a viscosity at 25 ° C. measured with a rotational viscometer in accordance with JIS Z8803.

  When the viscosity of the composition for anticorrosion according to the present invention is too high, the fluidity is poor and it is difficult to uniformly apply to a predetermined range. Moreover, it becomes difficult to permeate between the strands of the wire conductor, between the wire conductor and the terminal fitting, between the wire conductor and the insulation coating, and the like. When the viscosity of the composition for anticorrosion according to the present invention is too low, it tends to flow out of a predetermined range, and it becomes difficult to ensure the thickness.

  The anticorrosive composition according to the present invention can be cured by light or heat. A coating is formed and the shape is maintained by applying the coating to a predetermined portion and then curing. As described above, in the anticorrosive composition according to the present invention, the adhesiveness to the insulating coating is ensured by the component (A), and the adhesiveness to the terminal fitting and the electric wire conductor is secured by the component (B). This effect is maintained even after curing. Therefore, the cured product of the anticorrosive composition according to the present invention is excellent in adhesion to the insulation coating, the terminal fitting, and the electric wire conductor.

  From the standpoint of excellent adhesion to the wire conductor, the anticorrosive composition according to the present invention has an overlapping tensile shear strength of 20 kPa or more of aluminum measured in accordance with JIS K6850 after curing. preferable. More preferably, it is 30 kPa or more, More preferably, it is 50 kPa or more.

  The composition for anticorrosion according to the present invention is excellent in adhesion with an insulating coating, terminal fitting, and electric wire conductor, and therefore is used for anticorrosion of an electrical connection portion in which the terminal fitting and the electric wire conductor of the covered electric wire are electrically connected. It can be used suitably. Below, the example which applied the composition for anticorrosion which concerns on this invention in the covered electric wire with a terminal is shown.

  FIG. 1 is an external perspective view showing an example of a coated electric wire with a terminal according to the present invention, and FIG. 2 is a longitudinal sectional view taken along line AA in FIG.

  As shown in FIG. 1 and FIG. 2, the terminal-equipped covered electric wire 1 is configured such that the electric wire conductor 3 of the covered electric wire 2 in which the electric wire conductor 3 is covered with the insulating coating (insulator) 4 and the terminal fitting 5 are electrically connected by the electric connection portion 6. Connected.

  The terminal fitting 5 includes a tab-like connection portion 51 made of an elongated flat plate connected to a counterpart terminal, a wire barrel 52 extending at the end of the connection portion 51, and an electric wire fixing portion made of an insulation barrel 53. 54. The terminal fitting 5 can be formed (processed) into a predetermined shape by pressing a metal plate.

  In the electrical connection portion 6, the insulation coating 4 at the end of the covered electric wire 2 is peeled off to expose the electric wire conductor 3, and the exposed electric wire conductor 3 is pressure-bonded to one side of the terminal fitting 5, thereby covering the electric wire 2. And the terminal fitting 5 are connected. The wire barrel 52 of the terminal fitting 5 is crimped from above the wire conductor 3 of the covered electric wire 2 so that the wire conductor 3 and the terminal fitting 5 are electrically connected. Further, the insulation barrel 53 of the terminal fitting 5 is crimped from above the insulating coating 4 of the covered electric wire 2.

  In the covered electric wire 1 with a terminal, the range indicated by the alternate long and short dash line is covered with the cured product 7 of the anticorrosive composition according to the present invention. Specifically, among the portions exposed from the insulation coating 4 of the wire conductor 3, the insulation coating 4 after the rear end of the portion exposed from the insulation coating 4 of the wire conductor 3 from the surface of the terminal fitting 5 ahead of the tip. The range up to the surface is covered with the cured product 7. That is, the end 2 a side of the covered electric wire 2 is covered with the cured product 7 so as to slightly protrude from the end of the electric wire conductor 3 to the connection portion 51 side of the terminal fitting 5. The distal end 5 a side of the terminal fitting 5 is covered with the cured product 7 so as to slightly protrude from the end of the insulation barrel 53 to the insulating coating 4 side of the covered electric wire 2. As shown in FIG. 2, the side surface 5 b of the terminal fitting 5 is also covered with the cured product 7. In addition, the back surface 5c of the terminal metal fitting 5 may not be covered with the hardened | cured material 7, and may be covered. The peripheral end of the cured product 7 is composed of a portion that contacts the surface of the terminal fitting 5, a portion that contacts the surface of the wire conductor 3, and a portion that contacts the surface of the insulating coating 4.

  In this way, the electrical connection portion 6 is covered with the cured product 7 with a predetermined thickness along the outer peripheral shape of the terminal fitting 5 and the covered electric wire 2. Thereby, the exposed part of the wire conductor 3 of the covered electric wire 2 is completely covered with the cured product 7 and is not exposed to the outside. Therefore, the electrical connection portion 6 is completely covered with the cured product 7. Since the cured product 7 is excellent in adhesion to any of the electric wire conductor 3, the insulation coating 4, and the terminal fitting 5, moisture or the like enters the electric wire conductor 3 and the electrical connection portion 6 from the outside due to the cured product 7, and the metal portion is Prevent corrosion. Moreover, since it is excellent in adhesiveness, for example, even when an electric wire is bent in the process from manufacture of a wire harness to attachment to a vehicle, the cured product 7, the electric wire conductor 3, and the insulation coating 4 at the peripheral end of the cured product 7. In addition, it is difficult to form a gap between any of the terminal fittings 5, and waterproofness and anticorrosion function are maintained.

  The anticorrosive composition according to the present invention is applied in a predetermined range. The anticorrosive composition can be applied by a known means such as a dropping method, a coating method, or an extrusion method. When applying the anticorrosion composition, the temperature of the anticorrosion composition may be adjusted by heating, cooling, or the like.

  The anticorrosive composition according to the present invention is applied in a predetermined range with a predetermined thickness. The thickness is preferably within a range of 0.01 to 0.1 mm. If the anticorrosive composition becomes too thick, it becomes difficult to insert the terminal fitting 5 into the connector. When the anticorrosive composition becomes too thin, the anticorrosion performance tends to be lowered. In order to obtain the predetermined thickness, it is preferable to set the viscosity at 25 ° C. of the anticorrosive composition within a predetermined range.

  The anticorrosion composition applied in a predetermined range is cured by irradiation with light such as ultraviolet rays or by heating. Thereby, the hardened | cured material 7 of predetermined thickness is formed. The thickness of the cured product 7 is preferably in the range of 0.01 to 0.1 mm from the viewpoint of insertion into the connector and anticorrosion performance. More preferably, it exists in the range of 0.01-0.05 mm.

  The electric wire conductor 3 of the covered electric wire 2 is made of a stranded wire formed by twisting a plurality of strands 3a. In this case, the stranded wire may be composed of one type of metal strand or may be composed of two or more types of metal strand. Moreover, the twisted wire may contain the strand etc. which consist of organic fibers other than a metal strand. Note that “consisting of one type of metal strand” means that all the metal strands constituting the stranded wire are made of the same metal material, and “consisting of two or more types of metal strands” This means that the wire contains metal wires made of different metal materials. The stranded wire may include a reinforcing wire (tension member) for reinforcing the covered electric wire 2.

  Examples of the material of the metal wire constituting the wire conductor 3 include copper, a copper alloy, aluminum, an aluminum alloy, or a material obtained by applying various platings to these materials. Examples of the material of the metal strand as the reinforcing wire include copper alloy, titanium, tungsten, and stainless steel. Examples of the organic fiber as the reinforcing wire include Kevlar. As a metal strand which comprises the electric wire conductor 3, from the viewpoint of weight reduction, the material by which various plating was given to aluminum, aluminum alloy, or these materials is preferable.

  Examples of the material for the insulating coating 4 include rubber, polyolefin, PVC, and thermoplastic elastomer. These may be used alone or in combination of two or more. Various additives may be appropriately added to the material of the insulating coating 4. Examples of the additive include a flame retardant, a filler, a colorant and the like.

  Examples of the material (material for the base material) of the terminal fitting 5 include various copper alloys and copper in addition to brass that is generally used. A part (for example, a contact) or the entire surface of the terminal fitting 5 may be plated with various metals such as tin, nickel, and gold.

  In addition, in the covered electric wire 1 with a terminal shown in FIG. 1, the terminal metal fitting is crimped and connected to the end of the electric wire conductor, but other known electrical connection methods such as welding may be used instead of the crimping connection.

  Examples of the present invention and comparative examples are shown below. In addition, this invention is not limited by these Examples.

Example 1
(1) Production of covered electric wire For 100 parts by mass of polyvinyl chloride (degree of polymerization 1300), 40 parts by mass of diisononyl phthalate as a plasticizer, 20 parts by mass of calcium bicarbonate as a filler, and calcium zinc-based stabilizer 5 as a stabilizer A polyvinyl chloride composition was prepared by mixing parts by mass at 180 ° C. with an open roll and forming the pellets with a pelletizer.

  Next, using a 50 mm extruder, the polyvinyl chloride composition is 0.28 mm thick around a wire conductor (cross-sectional area 0.75 mm) made of an aluminum alloy twisted wire in which seven aluminum alloy wires are twisted together. Extrusion coated. This produced the covered electric wire (PVC electric wire).

(2) Crimp connection of terminal fittings After stripping the end of the produced coated wire and exposing the wire conductor, cover the male terminal fitting (tab width 0.64mm) made of brass, which is widely used for automobiles It crimped and crimped to the end of the electric wire.

(3) Preparation of anticorrosive composition Styrene-butadiene copolymer ("Tough Tech P1500" manufactured by Asahi Kasei Chemicals, content of 70% by weight of butane or butene) and tackifier (hydrogenated terpene compound "Clearon P125" manufactured by Yashara Chemical) ) Was mixed at a mass ratio of 40:60, and 5% by mass was blended with an ultraviolet curable resin (“TB3042B” manufactured by ThreeBond). Thereby, the composition for anticorrosion of Example 1 was obtained.

(4) Anticorrosion treatment In a case where a terminal metal fitting is crimped to a coated electric wire, an anticorrosive composition is applied so as to cover the range indicated by the one-dot chain line in FIG. 1 including the electrical connection portion between the electric wire conductor and the terminal metal fitting. The exposed wire conductor and terminal barrel were covered. At this time, a certain amount was applied using a pressure dispenser. Thereafter, the applied anticorrosion composition was irradiated with ultraviolet rays for 30 seconds to cure the anticorrosion composition, and a coated electric wire with a terminal was produced. The thickness of the cured product is 0.05 mm.

(Example 2)
Preparation of the anticorrosion composition was carried out in the same manner as in Example 1 except that 10% by mass of the styrene-butadiene copolymer was blended in the ultraviolet curable resin without using a tackifier.

(Comparative Example 1)
In the preparation of the anticorrosive composition, a mixture of the styrene-butadiene copolymer and the tackifier was used as the styrene-butadiene copolymer (“Tough Tech P2000” manufactured by Asahi Kasei Chemicals, butane or butene content: 33% by mass). The same procedure as in Example 1 was performed except that 50% by mass of the ultraviolet curable resin was blended.

(Comparative Example 2)
In the preparation of the anticorrosive composition, no tackifier was used, “Tuftec P2000” was used as a styrene-butadiene copolymer, and 0.5% by mass was blended in an ultraviolet curable resin (“TB3013Q” manufactured by ThreeBond). Same as Example 1.

  The viscosity at 25 ° C. of each prepared anticorrosion composition was measured using a rotational viscometer in accordance with JIS Z8803. Moreover, adhesiveness was evaluated about each prepared anticorrosion composition. Moreover, anticorrosion performance was evaluated about each obtained covered electric wire with a terminal. Table 1 shows the composition, measurement results, and evaluation results of the anticorrosion composition.

(Adhesiveness)
It evaluated by the overlap | superposition tensile shear strength of aluminum measured based on JISK6850 after hardening. JIS K6850 (“Adhesive-Tensile Shear Bond Tensile Shear Bond Strength Test Method”) uses standard test specimens to superimpose adhesive bonds between rigid adherends under specified adjustment and test conditions. It stipulates a method for measuring the combined tensile shear strength. An Al plate was used as the rigid adherend, and a test piece was prepared using the anticorrosion composition as the material for the adhesive layer sandwiched between the Al plates.

(Anti-corrosion performance)
In accordance with JIS C0023, a salt spray test was conducted for 96 hours on the electrical connection portion between the wire conductor of the covered electric wire with terminal and the terminal fitting. After the test, the cured product was peeled off, and visually judged by whether or not rust was generated in the electrical connection part.

  According to the Example, the covered electric wire with a terminal excellent in anticorrosion performance was obtained. On the other hand, in the comparative example, the covered electric wire with a terminal inferior to anticorrosion performance was obtained.

  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.

DESCRIPTION OF SYMBOLS 1 Coated electric wire with a terminal 2 Coated electric wire 3 Electric wire conductor 4 Insulation coating 5 Terminal metal fitting 6 Electrical connection part 7 Hardened | cured material of the composition for anticorrosion

Claims (6)

Containing the following components (A) to (C) ,
A composition for anticorrosion , wherein the overlap tensile shear strength between aluminum measured in accordance with JIS K6850 after curing is 20 kPa or more .
(A) Elastomer having a butene skeleton or a butane skeleton and a ratio of 70% by mass or more (B) (meth) acrylic monomer or (meth) acrylic oligomer liquid at 25 ° C. (C) polymerization initiator Containing the following components (A) to (C) ,
Furthermore, the composition for anticorrosion characterized by containing the tackifier which consists of at least 1 sort (s) of a rosin type | system | group, a terpene type | system | group, a terpene phenol type | system | group, a phenol type, a chroman indene type resin, and a petroleum resin .
(A) Elastomer having a butene skeleton or a butane skeleton and a ratio of 70% by mass or more (B) (meth) acrylic monomer or (meth) acrylic oligomer liquid at 25 ° C. (C) polymerization initiator   The component (A) is at least one of polybutene, polybutadiene, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, and ethylene-butadiene copolymer. The composition for anticorrosion as described.   Content of the said (A) component exists in the range of 1-30 mass%, The composition for anticorrosion of any one of Claim 1 to 3 characterized by the above-mentioned.   The anticorrosive composition according to any one of claims 1 to 4, wherein the viscosity at 25 ° C measured in accordance with JIS Z8803 is in the range of 500 to 10,000 mPa · s. The insulation coating of the said wire conductor containing the electrical-connection part by which the terminal metal fitting and the wire conductor of the covering electric wire were electrically connected by the hardened | cured material of the composition for anticorrosion of any one of Claim 1 to 5 With the terminal characterized in that the range from the surface of the terminal fitting ahead of the tip of the portion exposed from the end to the surface of the insulating coating behind the rear end of the portion exposed from the insulation coating of the wire conductor is covered Covered wire.

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