JP2014154357A - Drain wire terminal processing method for shielded electric wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve straight state maintaining force of a drain wire which is exposed from a sheath skin peeled end in a shielded electric wire for preventing coil break when a terminal connected to a drain wire terminal is inserted into a connector.SOLUTION: A drain wire is pulled out from a sheath skin peeled end together with a core wire on the shielded electric wire terminal side, a terminal is connected to the terminal of the drain wire. Then, an area from a position near the terminal connection part of the drain wire to the sheath skin peeled end, is coated with an ultraviolet curable resin. After that, ultraviolet light is irradiated to the ultraviolet curable resin to cure it.

Description

  The present invention relates to a drain wire end treatment method for a shielded electric wire, and more particularly, to enhance the connector insertability and waterproofness of a drain wire that is exposed together with a core wire by peeling the sheath at the shielded wire end.

  2. Description of the Related Art Conventionally, electrical components that are controlled by an electronic control unit are rapidly increasing as electrical components that are mounted on automobiles. For this reason, the number of signal lines connecting the electronic control unit and electrical components and the number of signal lines connecting the electronic control unit, sensors, and switches are increasing. In order to prevent noise from entering these signal lines, shielded wires are often used.

  As shown in FIGS. 5 (A) and 5 (B), the shielded electric wire 1 focuses one or more core wires 2 and drain wires 3, and a metal braided sheet and metal braided tube around the outer periphery of the core wires 2 and drain wires 3. Alternatively, a shield layer 4 is provided by covering a shield material made of metal foil, and a sheath (outer skin) 5 made of an insulating resin is provided on the outer periphery of the shield layer 4.

  In order to connect the core wire 2 and the drain wire 3 to the shielded wire 1, the sheath 5 is peeled off from the end of the wire, the core wire 2 and the drain wire 3 are exposed, and the core wire 2 is further peeled off the insulation coating 2a. Then, the core wire 2 b is exposed to connect the terminal 6, and the terminal 6 is inserted and locked to the connector 8. On the other hand, the drain wire 3 is not insulated and coated with a single core wire or a stranded wire, and the drain wire 3 is inserted and locked to the connector 8 only by connecting the terminal 6 to the tip.

  In the shielded electric wire 1, water is likely to be generated inside the shielded electric wire 1 from the peeled end 5 a of the sheath 5. Cheap. Therefore, as shown in FIG. 6, the applicant of the present application disclosed in Japanese Patent Application Laid-Open No. 2008-305634, which covers the drain wire protruding from the peeled end of the sheath 5 with the heat shrinkable tube 100 to form a pseudo-covered electric wire. At the same time, the peeled end 5 a of the sheath 5 is covered with a cap 102 filled with a sealing agent 101.

JP 2008-305634 A

  As a configuration of Patent Document 1, it is necessary to heat after covering the drain wire 3 exposed from the sheath 5 and projecting the heat-shrinkable tube 100, and there is a problem that the number of parts and work processes increase, resulting in high costs. . In addition, the waterproof structure of the peeled end of the sheath is also equipped with a resin cap filled with a sealant, which increases the number of parts and the work process, resulting in higher costs. There is a problem of becoming high.

  As described above, if the drain wire 3 is covered with the heat-shrinkable tube 100 to form a pseudo-covered electric wire, there is a problem that the cost increases. However, the core wire alone has a low straight line holding force when inserted into the connector, and even if the drain wire is gripped, the tip end side to which the terminal is connected is folded back, so that the workability of insertion into the connector is poor and troublesome. .

  The present invention has been made in view of the above-mentioned problems. A drain wire end treatment method for a shielded electric wire that can increase the straight line holding force of the drain wire and at the same time improve the water stopping performance, and a drain wire end treatment formed by the method. The challenge is to provide a structure.

In order to solve the above problems, the present invention draws a drain wire together with the core wire from the peeled end of the sheath on the shielded wire terminal side,
A terminal is connected to the terminal of the drain wire, and is covered with an ultraviolet curable resin from a position close to the terminal connecting portion of the drain wire to a peeled end of the sheath,
Then, the drain wire terminal processing method of the shield electric wire characterized by irradiating and hardening | curing an ultraviolet-ray to the said ultraviolet curable resin is provided.

  It is preferable that the skin-curved end of the sheath is coated with the ultraviolet curable resin on the entire surface of the skinned end including not only the drained portion of the drain wire but also the peripheral edge of the drawn-out portion of the core wire.

The drain wire is coated with an ultraviolet curable resin by dripping the melted ultraviolet curable resin onto the surface of the drain wire, coating with a roller, a brush, or the like, and wrapping it as a thin gel tape or sheet.
In the case of dripping or coating, the melted ultraviolet curable resin has a relatively high viscosity so that it does not easily flow out. Moreover, when using a gel-like tape, it winds around the outer periphery of a drain wire helically, and in the case of a sheet | seat, it rolls around sushi or bonding. Since the tape or sheet is in the form of a gel having flexibility before ultraviolet irradiation, it is easy to cover the drain wire.

The ultraviolet curable resin is preferably a dark part curable ultraviolet curable resin.
The dark-curing UV curable resin is
With respect to a polyisocyanate compound having two or more isocyanate groups, the number of hydroxyl groups was set to 1 or less by forming two or more hydroxyl groups of a polyol having two or more hydroxyl groups to form an ester bond with (meth) acrylate. An ultraviolet curable material (A) mainly composed of a (meth) acrylate of a polyol;
A chain transfer agent (B) comprising a metal complex compound containing at least one compound selected from a urethane bond, a urea bond and an isocyanate group, and a metal-containing compound; and an ultraviolet polymerization initiator (C). When,
It consists of the composition which mix | blended.
The ultraviolet curable resin has heat resistance that does not melt at 120 ° C. or lower.

  In addition, it is also possible to use the ultraviolet curable resin which does not have a dark part sclerosis | hardenability which mix | blended the ultraviolet polymerization initiator (C) with the said ultraviolet curable material (A), without mix | blending the said chain transfer agent (B). In this case, it is necessary to rotate either the ultraviolet irradiation lamp or the drain wire so that the entire surface of the ultraviolet curable resin is irradiated with ultraviolet rays to be cured.

The dark-curing ultraviolet curable resin contains a chain transfer agent (B). As the ultraviolet curable resin having dark part curable properties, an ultraviolet curable composition described in WO2012 / 102299 related to the prior application of the present applicant is suitably used.
The dark part curable ultraviolet curable composition is made of an ultraviolet curable resin which is located in a dark part where irradiation light does not reach and can cure a part where no radical is generated.
In addition, the whole can be reliably cured even when an ultraviolet / light transmission inhibitor composed of organic / inorganic fillers, carbon / metal particles, fibers, polymers / oligomers, various modifying additives and the like is blended.

  The UV curable resin having dark portion curable properties does not require heat treatment or moisture curing treatment, and when a portion of the UV curable resin is irradiated with UV rays and cured, the dark portions where the UV rays are blocked are also sequentially transferred by the chain transfer agent. It can be cured, and the entire ultraviolet curable resin can be rapidly cured including the dark part. Specifically, for example, when the UV curable resin blended with the chain transfer agent is irradiated with UV light for 10 seconds with a UV lamp, the irradiated part is instantaneously cured and the light of the UV lamp reaches. Even dark areas can be cured by leaving for several tens of seconds.

As a second invention, there is provided a drain wire end treatment structure for a shielded wire formed by a drain wire end treatment method.
In the drain wire processing structure, since the drain wire protruding from the peeled end of the sheath is covered with the cured ultraviolet curable resin, it has a linear holding force. Therefore, even if the drain wire is gripped when the terminal connected to the drain wire terminal is inserted into the connector, the drain wire does not break and can be easily performed. In addition, since the drain wire is covered with the cured UV curable resin and continues to the peeled end of the sheath, it is possible to prevent water from entering the shielded wire from the peeled end of the sheath along the drain wire, and to stop it. Water can be planned.

  As described above, in the present invention, the drain wire exposed from the sheath peeled end of the shielded electric wire is coated with the ultraviolet curable resin, and the ultraviolet curable resin is cured by irradiating with ultraviolet rays. Therefore, the drain wire has rigidity and is less likely to be bent, and when the terminal connected to the drain wire terminal is inserted and locked into the connector, the operator can easily grasp the drain wire and insert it into the connector. In addition, by covering the sheath skin end with the UV curable resin, it is possible to prevent water from entering the shielded wire from the skin peel end.

  In particular, the use of a dark-curing UV curable resin has the advantage that it can be cured to the inside of the UV curable resin or to the back side opposite to the irradiation side by simply irradiating a part of the UV curable resin. is there.

It is a front view of the terminal side of the shielded electric wire containing the drain wire of 1st Embodiment of this invention. (A) (B) (C) is drawing which shows the processing method of the drain line of 1st Embodiment. It is drawing which shows the process of inserting the terminal of the drain wire terminal processed by 1st Embodiment in a connector. (A) (B) is drawing which shows the process process of 2nd Embodiment. A shield electric wire is shown, (A) is a perspective view, (B) is drawing which shows a terminal processing method. It is drawing which shows the terminal processing structure of the conventional shielded electric wire.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show a first embodiment. As shown in FIG. 1, the drain wire 3 exposed from the peeled end 5 a of the sheath 5 of the shielded electric wire 1 is covered with a pseudo coating material 10.

  The shielded electric wire 1 is a general-purpose product having the same configuration as that of the prior art, and focuses 2 to 4 core wires 2 and drain wires 3, and a metal braided sheet, metal knitted tube or metal on the outer periphery of the core wires 2 and drain wires 3. A shield layer 4 is provided by covering a shield material made of foil, and a sheath (outer skin) 5 made of an insulating resin is provided on the outer periphery of the shield layer 4. The terminal on the connection side of the shielded electric wire 1 with the connector 8 peels off the sheath 5 from the electric wire end to expose the core wire 2 and the drain wire 3, and the core wire 2 further peels off the insulation coating 2a to remove the core wire 2b. The terminal 6 is exposed and connected, and the terminal 6 is inserted and locked to the connector 8.

The drain wire 3 is formed of a single core wire or a core wire made of a stranded wire, and a terminal 6 is connected to the tip. As shown in FIG. 2 (A), the drain wire 3 is provided with an ultraviolet curable resin 11 that is dark-curing over the entire length from the vicinity of the terminal 6 to which the terminal 6 is crimped and connected to the peeled end 5a of the sheath 5, as shown in FIG. It is dripped more, and it coat | covers and coat | covers without a clearance gap to the perimeter.
The ultraviolet curable resin 11 has a relatively high viscosity so that it does not sag in the applied state, and is uniformly applied to the entire circumference by rotating the drain wire 3.
Further, as shown in FIG. 2B, the ultraviolet curable resin 11 is applied to the entire end surface of the sheath peeled end 5a without any gap as shown by cross diagonal lines in the figure.

The dark part curable ultraviolet curable resin 11 is an ultraviolet curable resin having dark part curable properties in which an ultraviolet curable material (A), a chain transfer agent (B), and an ultraviolet polymerization initiator (C) are blended.
Hereinafter, the ultraviolet curable resin 11 will be described in detail.

The chain transfer agent (B), which is a component of the UV curable resin having dark part curability, includes (a) a compound containing at least one selected from a urethane bond, a urea bond, and an isocyanate group, and (b) And a metal complex compound containing a metal-containing compound.
The chain transfer agent (B) can exhibit intermolecular or intramolecular transmission functions after stabilizing the generated radicals. Therefore, the chain transfer agent (B) can instantaneously transmit the radicals generated in the system to a place where no radicals are generated, and the polymerization reaction can be started to advance the radical polymerization reaction. As a result, when the chain transfer agent (B) is blended with the ultraviolet curable material (A), the inside and the back side (that is, the dark part) where the irradiation light that has conventionally been difficult to cure cannot be surely cured. Can do. In addition, there is no need for an operation step of mixing a curing agent immediately before curing, a step of curing a dark part by heating or moisture curing after irradiation, etc., and the curing operation can be performed in a short time, and the curing workability is excellent. Yes.

In the chain transfer agent (B), the urethane bond, urea bond, and isocyanate group-containing compound of the component (a) are represented by the following (Formula 1) urethane bond part, the following (Formula 2) urea bond part, What is necessary is just to contain at least 1 sort (s) selected from the isocyanate group shown by the following (Formula 3) in 1 molecule or more.
(Formula 1) -NH-COO-
(Formula 2) -NH-CO-NH-
(Formula 3) -N = C = 0

The metal-containing compound (b) constituting the chain transfer agent (B) preferably contains at least one metal selected from tin, copper, zinc, cobalt and nickel. Among these, it is activated at a relatively high temperature (for example, a temperature of about 120 ° C.), and at room temperature, the effect of improving the curing rate in the dark part is hardly exhibited, so that the storage stability of the composition can be increased. From the viewpoint, a zinc-based metal complex compound or a copper-based metal complex compound is more preferable.
Specific examples of the metal-containing compound (b) include metal-containing compounds listed in paragraphs 0010 and 0154 of WO 2012/102299 relating to the prior application of the present applicant.

  In the chain transfer agent (B), the blending ratio of the above (a) and (b) is (a) :( b) = 100: 0.001 to 100: 10, preferably 100: 0.005 in mass ratio. Preferably it is 100: 5.

In the metal complex compound functioning as the chain transfer agent (B) composed of (a) and (b), the tin-based metal complex compound may be bis (2,4-pentanedionato) tin, dibutyltin bis ( Trifluoromethanesulfonate), dibutyltin diacetate, dibutyltin dilaurate, dibutyltin maleate, phthalocyanine tin (IV) dichloride, tetrabutylammonium difluorotriphenyltin, phthalocyanine tin (II), tributyl (2-pyridyl) tin, tributyl ( 2-thienyl) tin, tributyltin acetate, tributyl (trimethylsilylethynyl) tin, trimethyl (2-pyridyl) tin and the like.
Examples of copper-based metal complex compounds include bis (hexafluoroacetylacetonato) copper (II), bis (2,4-pentanedionato) copper (II), and bis (1,3-propanediamine) copper (II). Dichloride, bis (8-quinolinolato) copper (II), bis (trifluoro-2,4-pentanedionato) copper (II), bis (2-hydroxyethyl) dithiocarbamate copper (II), diethyldithiocarbamate copper, Dimethyldithiocarbamate copper (II), ethylenediaminetetraacetate copper (II) disodium, phthalocyanine copper (II), dichloro (1,10-phenanthroline) copper (II), phthalocyanine copper, tetra-4-tert-butylphthalocyanine copper, Tetrakis (acetonitrile) copper (I) hexafluorophosphate, copper naphthenate, etc. It can gel.
Zinc-based metal complex compounds include bis [2- (2-benzothiazolyl) phenolato] zinc (II), bis [2- (2-benzoxazolyl) phenolato] zinc (II), bis (2-hydroxyethyl) ) Zinc (II) dithiocarbamate, bis (2,4-pentanedionato) zinc (II), bis (8-quinolinolato) zinc (II), bis (tetrabutylammonium) bis (1,3-dithiol-2- Thion-4,5-dithiolato) zinc complex, disodium zinc ethylenediaminetetraacetate, zinc dibenzyldithiocarbamate (II), zinc dibutyldithiocarbamate (II), zinc diethyldithiocarbamate, zinc dimethyldithiocarbamate, zinc phthalocyanine, naphthenic acid Zinc and the like can be mentioned.
Examples of cobalt-based metal complex compounds include bis (cyclopentadienyl) cobalt (III) hexafluorophosphate, [1,1′-bis (diphenylphosphino) ferrocene] cobalt (II) dichloride, and bis (hexafluoroacetyl). Acetonato) cobalt (II), (1R, 2R) -N, N′-bis [3-oxo-2- (2,4,6-trimethylbenzoyl) butylidene] -1,2-diphenylethylenediaminatocobalt ( II), (1S, 2S) -N, N′-bis [3-oxo-2- (2,4,6-trimethylbenzoyl) butylidene] -1,2-diphenylethylenediaminatocobalt (II), bis ( 2,4-pentanedionato) cobalt (II), bis (trifluoro-2,4-pentandionato) cobalt (II), lid Cyanine cobalt (II), disodium ethylenediaminetetraacetate, hexaamminecobalt (III) chloride, N, N′-disalicylic ethylenediamine cobalt (II), [5,10,15,20-tetrakis (4-methoxy) Phenyl) porphyrinato] cobalt (II), tris (2,4-pentanedionato) cobalt (III), cobalt naphthenate, and the like.
Nickel-based metal complex compounds include [1,2-bis (diphenylphosphino) ethane] nickel (II) dichloride, bis (dithiobenzyl) nickel (II), bis (hexafluoroacetylacetonato) nickel (II) Bis (2,4-pentanedionato) nickel (II), bis (tetrabutylammonium) bis (maleonitriledithiolato) nickel (II) complex, bis (tricyclohexylphosphine) nickel (II) dichloride, bis (tri Phenylphosphine) nickel (II) dichloride, bromo [(2,6-pyridindiyl) bis (3-methyl-1-imidazolyl-2-ylidene)] nickel bromide, disodium nickel (II) ethylenediaminetetraacetate, dibutyldithiocarbamic acid nickel II), such as diethyldithiocarbamate nickel may be mentioned.
The following are mentioned as a commercial item of the said metal complex compound.
BPDZ: [“Bis (2,4-pentanedionato) zinc (II)” manufactured by Tokyo Chemical Industry Co., Ltd.]
-CDEDTC: [Copper (II) diethyldithiocarbamate manufactured by Tokyo Chemical Industry Co., Ltd.]
DBTDL: [“Dibutyltin dilaurate” manufactured by Tokyo Chemical Industry Co., Ltd.]

  The ultraviolet curable material (A) has a hydroxyl group in which two or more hydroxyl groups of a polyol having two or more hydroxyl groups form an ester bond with (meth) acrylate with respect to a polyisocyanate compound having two or more isocyanate groups. It is preferable that the main component is a (meth) acrylate of a polyol whose number is set to 1 or less.

Since the number of hydroxyl groups in the (meth) acrylate of the polyol is set to 1 or less, the urethanization reaction with the polyisocyanate compound is suppressed from proceeding in a state where it is blended with the polyisocyanate compound. Thereby, the storage stability of this composition is improved. The number of hydroxyl groups in the (meth) acrylate of the polyol may be 1 or 0. From the viewpoint of storage stability of the present composition, it is more preferably 0.
Examples of the (meth) acrylate of the polyol include dipropylene glycol diacrylate, tetraethylene glycol diacrylate, 1-acryloyloxy-3-methacryloyloxy-2-propanol (2-hydroxy-3-acryloyloxypropyl methacrylate), and the like. preferable. Specific examples of the (meth) acrylate include those described in paragraph 0131 of the aforementioned WO2012 / 102299.
The following are mentioned as a commercial item of this (meth) acrylate.
・ DPGA: [Dipropylene glycol diacrylate manufactured by Tokyo Chemical Industry Co., Ltd.]
・ TEGDA: [“Tetraethylene glycol diacrylate” manufactured by Tokyo Chemical Industry Co., Ltd.]
AMPOH: [“1-acryloyloxy-3-methacryloyloxy-2-propanol (2-hydroxy-3-acryloyloxypropyl methacrylate)” manufactured by Tokyo Chemical Industry Co., Ltd.]
-IBA: [“Isobornyl acrylate” manufactured by Tokyo Chemical Industry Co., Ltd.]

Specific examples of the polyisocyanate compound having two or more isocyanate groups include aliphatic polyisocyanates, alicyclic polyisocyanates, araliphatic polyisocyanates, and aromatic polyisocyanates. Also, biuret type polyisocyanates obtained by reacting these polyisocyanates with water, adduct type polyisocyanates obtained by reacting these polyisocyanates with polyhydric alcohols such as trimethylolpropane, and some of these polyisocyanates. Examples thereof include liquid prepolymers polymerized with polyesters and polyether derivatives, and multimers obtained by converting these polyisocyanates to isocyanurates. These may be used alone or in combination of two or more.
The following are mentioned as a commercial item of the said polyisocyanate compound.
・ N3600: ["Death Module N3600" manufactured by Sumika Bayer Urethane Co., Ltd.]
・ N3200: ["Death Module N3200" manufactured by Sumika Bayer Urethane Co., Ltd.]
Moreover, the following UP-1 and UP-2 are mentioned as a synthetic | combination product of a urethane prepolymer.

The urethane prepolymer UP-1 is synthesized by the following method.
A reaction vessel equipped with a stirrer was charged with 80 parts by mass of polypropylene glycol having a number average molecular weight of 400, 40 parts by mass of hexamethylene diisocyanate and 0.1 parts by mass of dibutyltin dilaurate, and the liquid temperature was changed from room temperature to 50 ° C. while stirring. Raise over time. Thereafter, a small amount is sampled, and FT-IR is measured, and stirring is continued at 50 ° C. while confirming absorption of isocyanate near 2300 cm −1. The reaction ends when the absorption disappears. This is designated as urethane prepolymer UP-1.
The urethane prepolymer UP-2 is synthesized by the following method.
A reaction vessel equipped with a stirrer was charged with 50 parts by mass of a terminal diol-type polycaprolactone having a number average molecular weight of 1250, 13.5 parts by mass of hexamethylene diisocyanate and 0.1 parts by mass of dibutyltin dilaurate, and the liquid temperature was adjusted to room temperature while stirring. To 50 ° C over 1 hour. Thereafter, a small amount is sampled, and FT-IR is measured, and stirring is continued at 50 ° C. while confirming absorption of isocyanate near 2300 cm −1. The reaction ends when the absorption disappears. This is designated as urethane prepolymer UP-2.

  In the ultraviolet curable material (A), the blending ratio of the polyisocyanate compound and the (meth) acrylate of the polyol is 90:10 to 10:90, preferably 80:20 to 20:80, in terms of mass ratio. When the blending amount of the (meth) acrylate of the polyol exceeds 90 by mass ratio, the amount of the polyisocyanate compound responsible for the curing reaction in the dark part becomes insufficient because the blending amount of the polyisocyanate compound is too large. The curing rate tends to be slow. On the other hand, even if the blending amount of the (meth) acrylate of the polyol is less than 10 by mass ratio, the generation amount of active species for curing the polyisocyanate compound is insufficient, and the curing rate in the dark part tends to be slow.

  The blending ratio of the ultraviolet curable material (A) and the chain transfer agent (B) is preferably a mass ratio of (A) :( B) = 90: 10 to 10:90. Specifically, the (meth) acrylate of the ultraviolet curable material (A) is 50 to 70 mass%, preferably 55 to 65 mass%, and the chain transfer agent (B) is 50 to 30 mass%, preferably 45 to 45 mass%. 35% by mass.

The ultraviolet polymerization initiator (C) is used for the purpose of causing radical reaction of (meth) acrylate of polyol. The ultraviolet polymerization initiator (C) is not particularly limited as long as it is a compound that absorbs ultraviolet rays and initiates a radical reaction. Examples of the ultraviolet polymerization initiator (C) include those described in paragraph 0133 of WO2012 / 102299, such as 1-hydroxycyclohexyl phenyl ketone and 2-tail anthraquinone.
Examples of the commercially available ultraviolet polymerization initiator (C) include IRGACURE 184, 369, 651, 500, 907, CGI 1700, CGI 1750, CGI 1850, CG 24-61; (Manufactured by UCB).

  As a compounding quantity of the said ultraviolet-ray polymerization initiator (C), it is preferable to exist in the range of 0.01-10 mass parts with respect to 100 mass parts of said ultraviolet curing materials (A). More preferably, it is the range of 0.1-7 mass parts. When the blending amount of the ultraviolet polymerization initiator is less than 0.01 parts by mass, the amount of the ultraviolet polymerization initiator is too small and the curing reaction by ultraviolet rays is difficult to start. On the other hand, when the blending amount of the ultraviolet polymerization initiator exceeds 10 parts by mass, an insoluble material is generated, and the physical properties of the cured product may be impaired.

  In addition to the above-mentioned various components, various compounding agents can be blended with the ultraviolet curable resin, if necessary, within a range that does not impair the object of the present invention. As a compounding agent, the stabilizer, plasticizer, softener, pigment, dye, antistatic agent, flame retardant, adhesiveness imparting agent, sensitizer, dispersion described in paragraphs 0117 to 0126 of the above-mentioned WO2012 / 102299 Agents, solvents, antibacterial and antifungal agents. Each compounding agent can be used in combination as appropriate. Moreover, the compounding quantity of a compounding agent can be suitably determined according to a use etc.

  The method for producing the ultraviolet curable resin is not particularly limited, but each of the above components is sufficiently kneaded by using a stirring device such as a mixing mixer under a reduced pressure or an inert gas atmosphere such as nitrogen and uniformly dispersed. The method of making it preferable is.

  As shown in FIG. 2B, after the ultraviolet curable resin 11 is applied to the entire end surface of the drain wire 3 and the sheath skin peeling end 5a, the ultraviolet curable resin 11 is applied by an ultraviolet irradiation lamp (for example, manufactured by SEN Special Light Source Co., Ltd.). Irradiate from the outer periphery. The ultraviolet curable resin 11 is cured by the irradiation of the ultraviolet rays. The ultraviolet curable resin 11 is also cured by the chain transfer agent (B) in the dark part of the ultraviolet curable resin 11 on the inner side where the ultraviolet rays are not irradiated and the lower side opposite to the irradiation side.

Specifically, when the ultraviolet irradiation lamp 13 irradiates, curing starts from a portion where the ultraviolet curable resin 11 is irradiated with ultraviolet rays. The chain transfer agent (B) is also cured by the chain transfer agent (B) on the inside where the ultraviolet rays are blocked from the portion where the curing has started and on the lower side where the ultraviolet rays are blocked.
By the irradiation of the ultraviolet rays, the ultraviolet curable resin 11 on the surface side of the portion directly exposed to the ultraviolet rays is dried and cured almost instantaneously. The curing time of the UV curable resin on the dark side and the UV curable resin on the lower side is slightly delayed but cures in several tens of seconds.

  In this way, the drain wire 3 is covered with the cured cylindrical ultraviolet curable resin by curing the ultraviolet curable resin 11 applied to the entire circumference of the drain wire 3. The cured cylindrical ultraviolet curable resin becomes the pseudo coating material 10, and the drain wire 3 becomes the pseudo coating wire. Moreover, the UV curable resin 11 applied to the entire surface of the sheath skin peeled continuously with the UV curable resin applied to the drain wire 3 is also cured by the chain transfer agent (B) without being directly irradiated with ultraviolet rays. Is done. Thereby, it becomes the structure by which the sheath skin peeling end surface was coat | covered with the hardened water stopping agent.

  With the above configuration, the drain wire 3 is covered with a hardened cylindrical pseudo-coating material 10 to provide a linear holding force. Therefore, as shown in FIG. 3, when the terminal 6 connected to the drain wire terminal is inserted and locked to the connector 8, when the worker grips and inserts the drain wire formed as a pseudo-covered wire, the waist break does not occur. Therefore, the insertion work into the connector can be easily performed.

  Further, since the entire end surface of the sheath peeled end 5a from which the drain wire 3 protrudes is also covered with the cured ultraviolet curable resin, it is possible to prevent water from entering the shielded electric wire 1 from the periphery of the drain wire 3 at the peeled end 5a. .

4A and 4B show a second embodiment.
In the second embodiment, the dark-curing ultraviolet curable resin is a soft gel-like tape 20 with a thin thickness. The tape 20 is wound around the outer peripheral surface of the drain wire 3 exposed from the end of the sheath skin without any gap, and is spirally wound to cover it. In addition, you may wind around a drain wire 3 or a sushi roll as a sheet | seat.
Thereafter, the tape (or sheet) wound by irradiating with ultraviolet rays is cured.

  The present invention is not limited to the above embodiment, and the drain wire may be covered with an ultraviolet curable resin that does not have dark part curability without blending the chain transfer agent (B) as the ultraviolet curable resin. In this case, in order to cure the ultraviolet curable resin coated on the entire circumference of the drain line, the drain line may be rotated or the ultraviolet irradiation lamp side may be rotated around the drain line with the hand type.

DESCRIPTION OF SYMBOLS 1 Shield electric wire 2 Core wire 3 Drain wire 4 Shield layer 5 Sheath 5a Sheath skin peeling end 10 Pseudo coating material 11 UV curable resin 13 UV irradiation lamp

Claims (4)

Pull out the drain wire along with the core wire from the peeled end of the sheath on the shielded wire terminal side,
A terminal is connected to the terminal of the drain wire, and is covered with an ultraviolet curable resin from a position close to the terminal connecting portion of the drain wire to a peeled end of the sheath,
Then, the drain wire terminal treatment method for the shielded wire, wherein the ultraviolet curable resin is cured by irradiating with ultraviolet rays.   The drain wire end treatment method for a shielded electric wire according to claim 1, wherein the ultraviolet curable resin is coated on an entire surface of the peeled end of the sheath including the periphery of the lead-out portion of the core wire. The ultraviolet curable resin is
With respect to a polyisocyanate compound having two or more isocyanate groups, the number of hydroxyl groups was set to 1 or less by forming two or more hydroxyl groups of a polyol having two or more hydroxyl groups to form an ester bond with (meth) acrylate. An ultraviolet curable material (A) mainly composed of a (meth) acrylate of a polyol;
A chain transfer agent (B) comprising a metal complex compound containing at least one compound selected from a urethane bond, a urea bond and an isocyanate group, and a metal-containing compound; and an ultraviolet polymerization initiator (C).
The drain wire end treatment method for a shielded electric wire according to claim 1 or 2, wherein the ultraviolet ray curable resin has a dark part curability.   A drain wire terminal treatment structure for a shielded wire formed by the method according to any one of claims 1 to 3.

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