JP6131888B2 - Covered wire and wire harness with terminal - Google Patents

Description

  The present invention relates to a coated electric wire with a terminal and a wire harness, and more particularly relates to a coated electric wire with a terminal and a wire harness excellent in corrosion resistance of an electrical connection portion which is a contact portion between an electric wire conductor and a terminal fitting.

  2. Description of the Related Art Conventionally, a covered electric wire formed by coating an outer periphery of a conductor made of tough pitch copper or the like as an electric wire routed in a vehicle such as an automobile is widely used. In the covered electric wire with terminal, the terminal fitting is connected to the conductor exposed by peeling off the insulator at the end of the covered electric wire. The terminal fitting electrically connected to the end of the covered electric wire is inserted and locked to the connector.

  A plurality of such covered electric wires with terminals are bundled to form a wire harness. In vehicles such as automobiles, wiring is usually performed in the form of a wire harness. When the wire harness is routed in an engine room, some indoor environments, etc., rust is likely to be generated at the electrical connection portion where the wire conductor and the terminal fitting come into contact with each other due to the influence of heat and water. Therefore, when wiring a wire harness in such an environment, it is necessary to prevent corrosion in the electrical connection portion.

  A technique for injecting grease into a connector in which a terminal fitting connected to a wire conductor is inserted and locked in order to prevent corrosion at the electrical connection portion is known (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 5-159646

  In recent years, in order to improve the fuel efficiency by reducing the weight of a vehicle such as an automobile, there is a demand for reducing the weight of the wire material constituting the wire harness. Therefore, the use of aluminum for the wire conductor has been studied.

  For the terminal fitting, copper-based metal such as copper or copper alloy having excellent electrical characteristics is generally used. When used in a combination of an aluminum wire and a copper terminal fitting, etc., and 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. This type of corrosion is more likely than when the wire conductor and the terminal fitting are the same material. For this reason, an anticorrosive capable of reliably preventing the electrical connection portion is required.

  However, the above-mentioned conventional covered electric wire with a terminal using grease has a problem that the anticorrosion effect cannot be enhanced by sufficiently preventing water from entering unless the grease is injected into the connector densely. If the filling amount of grease is increased in order to enhance the anticorrosion effect, the grease will be applied even to the portion that does not need to be anticorrosive. Furthermore, excessive filling causes stickiness of the connector and the electric wire, and deteriorates handling. Therefore, an anticorrosive capable of exhibiting high anticorrosion properties is demanded as a substitute for such problematic grease.

  Then, the method of apply | coating anticorrosive agents, such as a resin composition, to a terminal, and making it harden | cure is used. However, when the wire harness is used in an automobile or the like, the operating temperature range is large. In particular, when the wire harness is continuously used at a high temperature, there is a problem that a gap is generated between the insulation barrel portion and the wire coating. This is due to the following reason.

  In the covered electric wire with terminal, the terminal metal fitting is fixed to the end portion of the covered electric wire by crimping the insulation barrel of the terminal metal fitting around the covering material of the covered electric wire and crimping. When the covering material of the covered electric wire is heated at a high temperature, the covering thins with time due to stress relaxation, a difference in linear expansion coefficient with the terminal, volatilization of the plasticizer, and the like. On the other hand, the shape of the insulation barrel of the terminal fitting does not change over time even after being heated at a high temperature. For this reason, a gap is formed between the covering material and the terminal fitting.

  Thus, even if the contact portion between the wire conductor and the terminal fitting is covered with the anticorrosive agent, if a gap is formed between the covering material and the terminal fitting, moisture enters the covered electric wire with terminal from the gap. There is a problem that the contact portion between the wire conductor and the terminal fitting is corroded.

  An object of the present invention is to solve the above-mentioned problems of the prior art, and in the fixing portion where the terminal fitting is fixed to the covered electric wire, a gap is generated over time between the terminal fitting and the covered electric wire. An object of the present invention is to provide a coated electric wire with a terminal and a wire harness capable of preventing the corrosion of the electric contact portion between the electric wire conductor and the terminal fitting.

In order to solve the above problems, the coated electric wire with terminal of the present invention is
A terminal in which a wire conductor of a covered electric wire is connected to a terminal fitting, the terminal fitting is fixed to the covered electric wire, and a contact portion between the electric wire conductor and the terminal fitting is covered with an anticorrosive. A covered electric wire,
A sealing agent that fills a gap between the terminal fitting and the covered electric wire is applied to the wire fixing portion, and a crosslinked acrylic resin having a gel fraction within a range of 20 to 70% is used as the sealing agent. It is a summary.

  In the covered electric wire with a terminal of the present invention, it is preferable that the sealant is applied between an insulation barrel of the terminal fitting and a covering material of the covered electric wire.

  In the coated electric wire with a terminal of the present invention, the gel fraction of the crosslinked acrylic resin of the sealing agent is preferably 40% or more.

  In the covered electric wire with a terminal of the present invention, it is preferable that the conductor of the covered electric wire is an aluminum-based metal, the terminal fitting is a copper-based metal, and the contact portion is a dissimilar metal connecting portion.

  The wire harness of this invention makes it a summary to have said covered electric wire with a terminal.

  The covered electric wire with a terminal of the present invention includes an electric wire fixing portion in which an electric wire conductor of the covered electric wire is connected to a terminal fitting, and the terminal fitting is fixed to the covered electric wire, and a contact portion between the electric wire conductor and the terminal fitting. Is a coated electric wire with a terminal coated with an anticorrosive agent, and a sealing agent for filling a gap between the terminal fitting and the coated electric wire is applied to the electric wire fixing portion, and the gel is used as the sealing agent. By using a cross-linked acrylic resin having a fraction in the range of 20 to 70%, it is possible to prevent water from entering the contact portion between the terminal fitting and the wire conductor from the wire fixing portion. It is excellent in corrosion resistance.

  Since the wire harness of the present invention uses the above-described covered electric wire with a terminal, it prevents the intrusion of water from the gap of the electric wire fixing portion with respect to the covered electric wire of the terminal fitting, and maintains the anticorrosion performance for a long period of time. It is possible.

FIG. 1 is an external perspective view showing an embodiment of a covered electric wire with a terminal according to the present invention. 2 is a cross-sectional view taken along line AA in FIG. 3 is a cross-sectional view taken along line BB in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an external perspective view showing an embodiment of a covered electric wire with a terminal according to the present invention. As shown in FIG. 1, in the coated electric wire with terminal 1 of the present embodiment, the electric wire conductor 3 at the end of the covered electric wire 2 is crimped to the end of the terminal fitting 5, so that the electric wire conductor 3 contacts the terminal fitting 5. The part 6 is electrically connected. The terminal fitting 5 is formed using a copper-based metal such as Sn-plated copper.

  In the covered electric wire 2, an electric wire conductor 3 made of an aluminum alloy is covered with a covering material 4 made of an insulator such as polyvinyl chloride resin.

  The terminal fitting 5 includes a tab-like terminal connection portion 51 as a male terminal connected to the counterpart female terminal, and a barrel portion 54 that is formed extending from the base end of the terminal connection portion 51 and for crimping the covered electric wire 2. And have. The barrel portion 54 is composed of two crimping portions of a wire barrel 52 provided on the terminal connection portion 51 side and an insulation barrel 53 provided on the wire conductor 2 side.

  2 is a cross-sectional view taken along line AA in FIG. As shown in FIGS. 1 and 2, the wire barrel 52 of the terminal fitting 5 is crimped and crimped to the wire conductor 3 at the end of the covered wire 2. The crimp portion of the wire barrel 52 is formed as a contact portion 6 with the electric wire conductor 3. This crimping part becomes the contact part 6, and the wire conductor 3 and the terminal fitting 5 are electrically connected. The contact portion 6 is covered with an anticorrosive agent 7. FIG. 1 shows the anticorrosive agent 7 in a transparent state.

  The contact portion 6 is a state in which a dissimilar metal such as an aluminum-based metal such as an aluminum alloy of the wire conductor 3 and a copper-based metal such as a copper alloy of the wire barrel 52 is in contact, and is configured as a dissimilar metal connecting portion.

  3 is a cross-sectional view taken along line BB in FIG. As shown in FIGS. 1 and 3, the insulation barrel 53 of the terminal fitting 5 is crimped by being crimped to the covering material 4 of the covered electric wire 2. The crimp portion of the insulation barrel 53 is formed as an electric wire fixing portion for fixing and holding the terminal fitting 5 to the end of the covered electric wire 2.

  A sealing agent 8 for filling a gap between the terminal fitting 5 and the covered electric wire 2 is applied to the electric wire fixing portion. The place where the sealant 8 is applied is a portion between the insulation barrel 53 and the covering material 4. The sealing agent 8 may be applied to any of the insulation barrel 53 side, the periphery of the covering material 4, and both the insulation barrel 53 side and the periphery of the covering material 4.

  It is sufficient that the sealing agent 8 is filled between the insulation barrel 53 and the covering material 4 and continuously covered over the entire circumference of the covering material. Specifically, the sealing agent 8 may be applied inward from the end of the insulation barrel 53 in the front-rear direction of the linear direction. Further, the sealing agent 8 may be applied to the surface of the covering material 4 so as to protrude from the insulation barrel 53 before and after the insulation electric wire 53 of the insulation barrel 53 in the line direction.

  The sealing agent 8 is filled between the terminal fitting 5 such as the insulation barrel 53 and the covered electric wire 2 such as the covering material 4 in the electric wire fixing portion, so that, for example, the covering material 4 of the covered electric wire is caused by heat aging or the like. Even when it is thinned over time, the sealing agent 8 is formed of a cross-linked acrylic adhesive, so that the sealing agent is filled so as to fill the gap formed between the insulation barrel 53 and the covering material 4. 8 can be deformed to follow and prevent the generation of a gap. Therefore, compared with the case where the sealant 8 is not used, water enters from a gap formed between the insulation barrel 53 and the covering material 4, and the water reaches the contact portion 6 between the wire conductor and the terminal fitting. Therefore, it is possible to satisfactorily prevent the contact portion 6 from being corroded.

  As the sealant 8, a cross-linked acrylic pressure-sensitive adhesive is used. The crosslinked acrylic pressure-sensitive adhesive is crosslinked so that the gel fraction is in the range of 20 to 70%. If the gel fraction of the sealing agent 8 is less than 20%, it is difficult to maintain the sealing property after heat aging. Further, if the gel fraction of the sealing agent 8 exceeds 70%, the material strength is improved by cross-linking, and the interfacial peeling is facilitated. Therefore, between the sealing agent 8 and the covered electric wire 2 or the sealing agent 8 and the terminal fitting 5 It becomes easy to generate a gap.

  The gel fraction of a preferable sealing agent is 40% or more. When the gel fraction of the sealant is 40% or more, the oil resistance is improved, so that even if immersed in oil, the adhesive does not dissolve in the oil and there is no fear that the adhesive strength is reduced. The coated electric wire with a terminal can be suitably used at a site where oil resistance is required, such as an engine room, by improving the oil resistance of the sealing material.

In the present invention, the gel fraction of the pressure-sensitive adhesive represents the degree of crosslinking of the pressure-sensitive adhesive. The gel fraction is a numerical value obtained by measuring the mass of the crosslinked pressure-sensitive adhesive, dipping it in an ethyl acetate solution at 23 ° C. for 20 hours, taking it out, drying it at 120 ° C. for 1 hour and measuring the mass, It is.
Gel fraction (%) = (mass after drying / mass before immersion) × 100

  The adhesive used as the sealant 8 preferably has an adhesive force between the covering material used for the covered electric wire and the metal of the terminal fitting of 0.2 MPa or more. In this case, the said adhesive force is a value measured using the oil surface adhesive force test method described in the column of the Example.

The application amount of the sealing agent 8 is not particularly limited. The coating amount is in the range of 1.0mg ^/ cm ² ~10mg ^/ cm 2 is easy to uniform coating is preferred because of easy like defining the application range.

  The crosslinked acrylic pressure-sensitive adhesive used for the sealant 8 is obtained by crosslinking a pressure-sensitive adhesive made of an acrylic resin. As the acrylic resin, an acrylic resin such as an ultraviolet curable (UV reaction type) acrylic resin or a solvent type acrylic resin is used. In order to prepare the gel fraction of the acrylic resin within the above specific range, in the case of the ultraviolet curable resin, the irradiation amount of the ultraviolet light may be appropriately adjusted, and in the case of the solvent curable acrylic resin, the crosslinking agent. What is necessary is just to adjust suitably the addition amount of hardening | curing agents, such as.

  As the ultraviolet curable acrylic resin used for the sealant 8, a cured product (ultraviolet curable resin) of an ultraviolet curable resin composition containing a (meth) acrylate component can be used. An ultraviolet curable resin composition can be comprised from components, such as (meth) acrylate components, such as a (meth) acrylate monomer, an adhesion imparting agent, a crosslinking agent, and a photoinitiator, for example. The composition of the ultraviolet curable resin containing a (meth) acrylate component can be cured in a short time by light irradiation such as ultraviolet rays after application.

  As said (meth) acrylate compound, if it is a compound which has a 1 or more (meth) acrylate group in a molecule | numerator, it will not restrict | limit in particular and a conventionally well-known thing can be used. Examples of (meth) acrylate compounds include (meth) acrylate oligomers and (meth) acrylate monomers. In the present invention, the description of “(meth) acrylate” means methacrylate and acrylate.

The solvent-type acrylic resin used for the sealant 8 is a pressure-sensitive adhesive mainly composed of an acrylic ester polymer and is obtained by solution polymerization or the like.

  The component of the solvent-type acrylic resin is preferably composed of an acrylate copolymer, an acrylate monomer, and the like. As the curing agent for the solvent-type acrylic resin, for example, isocyanate, epoxy, urethane, metal alkoxide and the like are used.

  The electric wire conductor 3 of the covered electric wire 2 is composed of a stranded wire formed by twisting a plurality of strands 3a. 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.

  Examples of the material of the metal wire constituting the wire conductor 3 include copper, copper alloy, aluminum, or materials obtained by applying various platings to these materials in addition to the aluminum alloy. Moreover, as a material of the metal strand as a reinforcement wire, a copper alloy, titanium, tungsten, stainless steel etc. can be illustrated. Examples of the organic fiber as the reinforcing wire include Kevlar. As a metal strand used for the electric wire conductor 3, it is preferable to use aluminum or aluminum alloy from points, such as weight reduction of an electric wire.

  It does not specifically limit as a material of the coating | covering material 4 used for the covered electric wire 2, For example, rubber | gum, polyolefin, a vinyl chloride resin (PVC), a thermoplastic elastomer, etc. are mentioned. These may be used alone or in admixture of two or more. Various additives may be appropriately added to the material of the covering material 4. Examples of the additive include a flame retardant, a filler, a colorant and the like.

  The metal plate used for the terminal fitting 5 can be, for example, a metal plate of various copper alloys such as brass and copper alloy in addition to the copper plate. In addition to tin, various metal plating such as nickel, gold and silver can be used for plating.

  The anticorrosion agent 7 is not particularly limited as long as it is a material capable of forming an anticorrosion coating film, and a material used for the anticorrosion agent of this type of terminal fitting can be used. As the preferable anticorrosive 7, a cured product (ultraviolet curable resin) of an ultraviolet curable resin composition containing a (meth) acrylate component can be used.

  It is preferable to apply the anticorrosive 7 in the contact portion 6 between the wire conductor 3 and the terminal fitting 5 so that the thickness is in the range of 0.01 to 3 mm. If the thickness of the anticorrosive 7 is too thick, it may be difficult to insert the terminal fitting 5 into the connector of the mating terminal. Moreover, when the thickness of the anticorrosive 7 becomes too thin, there exists a possibility that anticorrosion performance may become inadequate.

  In the coated electric wire with terminal 1 shown in FIG. 1 and FIG. As shown in FIG. 2, the anticorrosive 7 is coated with a predetermined thickness along the outer peripheral shape of the terminal fitting 5 and the covered electric wire 2. The bottom surface is not covered with the anticorrosive 7 and the metal of the terminal fitting 5 is exposed to the outside.

  The anticorrosive 7 completely covers at least the exposed portion of the wire conductor 2. The anticorrosive 7 coats the end side of the covered wire 4 so that it protrudes slightly from the tip of the wire conductor 2 to the connecting portion 51 side of the terminal fitting 5. Further, the end side of the terminal metal fitting 5 is covered so as to slightly protrude toward the insulator 4 side.

  The portion covered with the anticorrosive agent 7 is not limited to the above-described form, and the covered electric wire with terminal 1 only needs to be covered so that at least the electric wire conductor 3 is not exposed to the outside. Moreover, as shown in FIG. 1, you may coat | cover so that the anticorrosive 7 may protrude outward from the barrel part 54, and you may coat | cover the bottom face of the terminal metal fitting 5 with the anticorrosive 7, although it does not show in particular. Moreover, the side surface of the terminal metal fitting 5 may be either coated with the anticorrosive 7 or not.

  Hereinafter, the manufacturing method of the covered electric wire with a terminal is demonstrated. In order to manufacture the covered electric wire 1 with a terminal, the terminal metal fitting 5 and the covered electric wire 4 are prepared. The terminal fitting 5 uses an intermediate member obtained by punching and cutting the Sn-plated copper plate 8 into a terminal developed shape, and performs a bending process or the like to form the barrel portion 54. On the other hand, the covered electric wire 2 peels off the insulator 4 at the end to expose the electric wire conductor 2 by a predetermined length. Next, the sealant 8 is applied between the insulation barrel 53 and the covering material 4 and crosslinked by a predetermined means. Specifically, this application may be applied to either the insulation barrel 53 side or the coating material 4 side. The application method of the sealing agent 8 is not particularly limited, and various application means can be used, and examples thereof include application methods such as dropping onto a terminal and dipping of an electric wire. A preferred coating method is dropping onto a terminal because the coating amount, position accuracy, etc. can be easily adjusted.

  Next, the terminal fitting 5 is crimped to the end of the covered electric wire 2 to crimp the barrel portion 54, and the wire conductor 3 and the terminal fitting 5 are connected. For crimping, the wire conductor 3 is crimped to the wire barrel 52 of the terminal fitting, and the insulator 4 is crimped to the insulation barrel 53. Next, the composition of the anticorrosive agent 7 is applied to a predetermined range of the contact portion 6 between the electric wire conductor 3 and the terminal metal fitting 5, and the anticorrosive agent 7 is cured under predetermined conditions, whereby the covered electric wire 1 with terminals is obtained. .

  The method for applying the composition of the anticorrosive agent 7 to the contact portion 6 is not particularly limited, and known means such as a dropping method, a coating method, and an extrusion method can be used. Moreover, when applying the composition of the anticorrosive agent 7, the temperature of the composition of the anticorrosive agent 7 may be adjusted by heating, cooling, or the like.

  For curing the anticorrosive composition, for example, a curing device such as an ultraviolet irradiation device or a heating device can be used.

  Hereinafter, the wire harness of the present invention will be described. The wire harness of the present invention is formed by bundling a plurality of covered electric wires including the above-described covered electric wire with terminal 1. In the wire harness, a part of the covered electric wire may be the covered electric wire 1 with a terminal of the present invention, or all may be the covered electric wire 1 with a terminal of the present invention.

  In the wire harness, the plurality of covered electric wires may be bundled by tape winding, or may be bundled by being covered by an exterior part such as a round tube, a corrugated tube, or a protector. .

  The wire harness of the present invention is suitable for being routed in a vehicle such as an automobile, and is particularly suitable for being routed in an engine room or a vehicle in a wet area. When the wire harness is routed in such a place, the electrical connection portion between the wire conductor 3 and the terminal fitting 5 is likely to corrode due to the influence of heat and water. Since the contact part 6 of the wire conductor 3 and the terminal metal fitting 5 in the covered electric wire 1 with a terminal is covered with the anticorrosive agent 7, the wire harness of this invention can suppress generation | occurrence | production of corrosion effectively. Furthermore, a sealing agent that fills the gap between the terminal fitting and the covered electric wire is applied to the electric wire fixing portion, and the gel fraction of the sealing agent is in the range of 20 to 70%, so that the covered electric wire and the insulation barrel It is possible to prevent water from entering from a gap between the terminal fittings and the like.

Examples 1-6, Comparative Examples 1-3
Examples 1, 3, and 6 were cured using the solvent-type acrylic pressure-sensitive adhesive and curing agent shown in Table 1, and Examples 2, 4, and 5 were shown in Table 1 using the UV-reactive acrylic pressure-sensitive adhesive shown in Table 1. Cured under UV irradiation conditions, Comparative Examples 1 and 2 were cured using the solvent-type acrylic adhesive and curing agent shown in Table 2, and Comparative Example 3 was shown in Table 2 using the UV-reactive acrylic adhesive shown in Table 2. It hardened | cured on UV irradiation conditions, the test piece of the adhesive test was produced, and the oil surface adhesive force test was done. The tests were conducted for (1) initial stage, (2) after heat aging, and (3) after oil resistance test. Moreover, the gel fraction was measured about the hardened | cured material of each adhesive. The results are shown in the table. Details of materials, test methods, and evaluation results used in Examples and Comparative Examples are as follows.

[Solvent type acrylic adhesive]
Acrylic adhesive (solvent type): manufactured by Soken Chemical Co., Ltd., product name “SK Dyne 1310”, solid content: 33% by mass
・ Curing agent: manufactured by Soken Chemical Co., Ltd., product name “Curing agent L-45”
・ Curing conditions: 120 ° C., 10 minutes

[UV curable acrylic adhesive]
・ Acrylic adhesive (UV reaction type): Nippon Synthetic Chemical Co., Ltd., product name "UV-3000B"
Curing condition: Irradiated with a predetermined integrated light amount shown in the table (lamp: high-pressure mercury lamp, light amount: 100 mW / cm ² , 365 nm)

[Oil surface adhesion test]
(1) Initially An adhesion test was performed using a Sn-plated copper plate used for the terminal fitting and a soft vinyl chloride resin sheet used for the covering material of the covered electric wire as test pieces. The dimensions of the test piece were 25 mm × 80 mm × thickness 2 mm. First, the periphery is masked so that a circular region with a diameter of 20 mm is formed on the surface of the Sn-plated copper plate of the test piece, and after applying 1.0 mg / cm ^{2 of} oil to the surface, a predetermined amount of adhesive ( Solvent type: 100 mg, UV reaction type: 60 mg) were applied and cured to form an adhesive layer. On the other hand, a soft polyvinyl chloride sheet was placed on the adhesive on the surface of the Sn-plated copper plate and pressed with a press machine at a pressure of 50 MPa for 30 seconds to prepare a test piece for an adhesion strength test. Then, after leaving the test piece at room temperature for 2 days, a tensile shear test was performed, the oil surface adhesive strength (initial) was measured, and the fracture surface was observed. The tensile speed of the tensile test was 100 mm / min. Judgment criteria are excellent (◎) when the bond strength value is 0.2 MPa or more and cohesive failure, and favorable (◯) when the bond strength value is 0.2 MPa or more and interface fracture, The case where the value of the adhesive strength was less than 0.2 MPa was regarded as defective (x).

[Sn plated copper plate]
A test piece was prepared by cutting a Sn-plated copper plate having a surface of which a tin plate (thickness: 10 μm) was applied to a 2 mm thick copper plate into a size of 25 mm × 80 mm.
[Soft polyvinyl chloride sheet]
With 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 heavy calcium carbonate as a filler, and 5 parts by mass of calcium zinc-based stabilizer as a stabilizer by an open roll A polyvinyl chloride composition was prepared by mixing at 180 ° C. and forming into pellets with a pelletizer. Subsequently, the said composition was shape | molded with the injection molding machine, and it cut | disconnected to 25 mm x 80 mm x 2 mm, and was set as the test piece.

(2) After heat aging The test piece after pressing was left in an atmosphere of 120 ° C. for 240 hours, and then the adhesive strength was measured under the same conditions as in the initial stage. The results are shown in the table. The judgment criteria were good (◯) when the retention rate of the adhesive strength after heat aging with respect to the initial adhesive strength was 80% or more, and poor (×) when the retention rate was less than 80%.

(3) After oil resistance test The test piece after heat aging is further subjected to test oil No. 1 described in JIS K6301. After being immersed in No. 1 at room temperature for 20 hours, the adhesive strength was measured. The unit of the measurement result is% (initial value ratio).

[Gel fraction measurement method]
The cured product was immersed in an ethyl acetate solution at 23 ° C. for 20 hours, then taken out, dried at 120 ° C. for 1 hour, measured before and after drying, and obtained from the following formula.
Gel fraction (%) = (mass after drying / mass before immersion) × 100

As shown in Table 1, in Examples 1 to 6, the gel fraction of the cross-linked acrylic resin constituting the pressure-sensitive adhesive was in the range of 20 to 70%, so that the oil level adhesive force was good. On the other hand, since Comparative Example 1 does not contain a curing agent in the composition of the sealing agent, the gel fraction was 0% and the initial adhesiveness was sufficient, but the adhesiveness after heat aging, after the oil resistance test The adhesion was poor. Further, in Comparative Example 2, the gel fraction exceeded 80%, and thus the interface peeled after heat aging and the adhesiveness was poor. In Comparative Example 3, since the gel fraction was 91%, the interfacial peeling occurred from the initial stage and the adhesion was poor.

  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.

  Although the covered electric wire 1 with a terminal of the said Example showed the example which used the tab-shaped male terminal as a terminal metal fitting, it is not limited to this. For example, a covered electric wire with a terminal may use a female terminal as a terminal fitting. A tuning fork terminal or the like may be used as the terminal fitting.

  Moreover, you may comprise the barrel part 54 of the terminal metal fitting 5 only from the wire barrel which does not have an insulation barrel. In this case, the wire barrel may be pressure-bonded to both the wire conductor and the covering material, and the sealing agent 8 may be applied between the covering material and the wire barrel.

  Moreover, you may comprise the barrel part 54 of the terminal metal fitting 5 only from an insulation barrel. In that case, methods such as pressure welding, ultrasonic welding, and soldering can be used as a method for connecting the wire conductor and the terminal fitting. The insulation barrel is pressure-bonded to the covering material of the covered electric wire, and a sealant is applied between the insulation barrel and the covering material.

DESCRIPTION OF SYMBOLS 1 Coated electric wire with a terminal 2 Coated electric wire 3 Electric wire conductor 4 Coating material 5 Terminal metal fitting 51 Terminal connection part 52 Wire barrel 53 Insulation barrel 54 Barrel part 6 Contact part 7 Anticorrosive 8 Sealant

Claims (5)

A terminal in which a wire conductor of a covered electric wire is connected to a terminal fitting, the terminal fitting is fixed to the covered electric wire, and a contact portion between the electric wire conductor and the terminal fitting is covered with an anticorrosive. A covered electric wire,
A sealing agent that fills a gap between the terminal fitting and the covered electric wire is applied to the wire fixing portion, and a crosslinked acrylic resin having a gel fraction within a range of 20 to 70% is used as the sealing agent. A covered electric wire with a terminal, characterized by   2. The covered electric wire with a terminal according to claim 1, wherein the sealing agent is applied between an insulation barrel of the terminal fitting and a covering material of the covered electric wire.   The covered electric wire with a terminal according to claim 1 or 2, wherein the gel fraction of the cross-linked acrylic resin of the sealant is 40% or more.   The conductor of the said covered electric wire is an aluminum-type metal, the said terminal metal fitting is a copper-type metal, The said contact part is a dissimilar metal connection part, The any one of Claims 1-3 characterized by the above-mentioned. Covered wire with terminal.   It has a covered electric wire with a terminal given in any 1 paragraph of Claims 1-4, A wire harness characterized by things.

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