JP2014150656A - Wire fixation method and wire fixation structure of electric connection box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily cover and fix wires derived from an electric connection box.SOLUTION: A protrusion for tape winding is projectingly provided from the periphery of a wire exit opened in a case of an electric connection box, UV curable tape is used as tape to be wound to the protrusion, the UV curable tape is wound to the outer surface of the protrusion and wound to the wire so as to surround the wire surrounded by the wire exit and the protrusion and derived continuously from the tip of the protrusion to the outside, the UV curable tape is wound in a pyramid-shape so as to gradually come close to the outer peripheral surface of the wire and terminated with a close contact with the outer peripheral surface of the wire, the wound UV curable tape is cured with the irradiation of the ultra violet ray to be a pyramid-shaped extended exit member for covering the wire derived from the wire exit, and a wire group is fixed to the inner peripheral surface of the extended exit member.

Description

  The present invention relates to an electric connection box electric wire fixing method and electric wire fixing structure, and more specifically, the electric wire can be discharged without changing the outlet structure even if the amount of electric wire drawn from the outlet of the electric connection box mounted on the vehicle is increased or decreased. And a fixing structure formed by the method.

  Conventionally, electric wires connected to electric parts such as bus bars, relays, and fuses mounted in an electric connection box mounted on an automobile are drawn out from an outlet provided in a case of the electric connection box. Conventionally, as shown in FIG. 6, the electric wires drawn out from these outlets are provided with a tape-projection piece 103 protruding from the peripheral wall of the outlet 102 provided in the case 101 of the electric connection box 100, and the electric wire W is attached to the protrusion piece 103. In many cases, the adhesive tape 104 is wound and fixed. In some cases, the protruding piece and the electric wire are fixed with a fastening band instead of the adhesive tape.

  The size of the outlet provided in the electrical junction box must correspond to the cross-sectional area of the wire group to be drawn out, and it is necessary to take dust-proof measures at the outlet so that a large gap does not occur at the outlet through the wire group. Therefore, it is necessary to change the exit area in accordance with the amount of electric wires, and there is a problem that the cost of molds and the like is increased in order to newly create a case for the electrical connection box.

As shown in FIGS. 7 (A) and 7 (B) in Japanese Patent Application Laid-Open No. 2004-72848, the present applicant provides a wire outlet 150 that is notched in the peripheral wall of the electrical junction box 100, and is separated from the wire outlet. An electric connection box is provided in which a wire holding member 152 made of a material is fitted and locked, and the wire drawn out from the wire outlet 150 is held by the wire holding member 152 and fixed with tape.
In the electrical junction box, if the cross-sectional area of the wire outlet is made large, and the amount of the drawn wire is small, a part of the wire outlet is closed by a wire holding member 152 to be retrofitted, thereby preventing dust. It is possible to apply.

JP 2004-72848 A

  In the electrical junction box of Patent Document 1, when the shape of the separate wire holding member is changed, the wire can be fixed to the outlet of the cross-sectional area corresponding to the amount of the wire drawn from the electrical connection box. Since it is necessary and the shape of the electric wire holding member needs to be changed according to the amount of electric wire, the problem of cost increase cannot be solved.

  The present invention has been made in view of the above problems, and even if the cross-sectional area of the wire group drawn from the electrical junction box changes, it is not necessary to change the exit area of the case of the electrical junction box, and a separate material is attached. There is no need, and the cross-sectional area of the outlet can be easily and easily changed according to the cross-sectional area of the electric wire group without increasing the cost, and the electric wire group can be fixed to the outlet.

In order to solve the above-mentioned problems, as a first invention, a tape winding projection is provided from the periphery of the wire outlet opening in the case of the electrical junction box, and the nonwoven fabric is impregnated with an ultraviolet curable resin as a tape to be wound around the projection. Using a UV curable tape in which an ultraviolet curable resin layer is laminated on a UV curable tape or resin tape layer,
The UV curable tape is wound around the outer surface of the protrusion, and continuously wound outward from the tip of the protrusion so as to surround the wire outlet and the electric wire surrounded by the protrusion. Is wound in a conical shape so as to gradually approach the outer peripheral surface of the electric wire and is brought into close contact with the outer peripheral surface of the electric wire and terminated.
Electrical connection for fixing the wire group to the inner peripheral surface of the extended outlet member by irradiating and curing the wound UV curing tape with ultraviolet rays to form a conical extension outlet member that covers the electric wire drawn out from the electric wire outlet A method for fixing electric wires in a box is provided.

  In the present invention, the electric wire outlet provided in the case of the electric connection box is a large area outlet corresponding to the assumed maximum electric wire amount so that the case can be shared even if the electric wire amount drawn from the electric connection box changes, This is dealt with by changing the diameter of the extended outlet member having a substantially conical cylindrical shape formed by winding the UV curable tape according to the cross-sectional area. That is, when the amount of electric wires is small and the cross-sectional area of the electric wire group is small, the inclination angle from the large diameter side to the small diameter side of the conical cylinder of the extension outlet member becomes large.

  In this way, the UV curing tape is wound around the periphery of the wire outlet, wound around the outer periphery of the drawn wire group, and then cured by ultraviolet irradiation to provide a conical extension outlet member, and the extension outlet member The wire group is fixed to Therefore, it is not necessary to change the entire case to be molded or to provide another material according to the amount of drawn wire, and to fix the wire group without creating a gap at the wire outlet while sharing the case it can.

When the tape winding protrusion protruding from the periphery of the wire outlet protrudes from the entire circumference of the wire outlet, the winding start end side of the UV curable tape is wound around the outer periphery of the protrusion. The wire is wound in a conical shape with a reduced cross-sectional area along the wire group.
When the tape winding protrusion protruding from the peripheral edge of the wire outlet does not protrude from the entire circumference of the wire outlet and protrudes from a pair of opposing positions such as the left and right sides of the wire outlet, or the wire outlet When protruding from only one side of the wire, the width of the UV curable tape continuous from the wrapping portion of the outer surface of the protrusion is adhered to the periphery of the wire outlet at the periphery of the wire outlet where no protrusion is provided. The entire circumference of the wire outlet is surrounded by UV curing tape.
As described above, the entire circumference of the wire outlet is surrounded on the winding start side of the UV curable tape, the winding termination side of the UV curable tape is closely attached to the outer periphery of the wire group, and the wire outlet is made of the UV curable tape. It is set as the state sealed with the said cone-shaped extension exit member to form. That is, the UV curable tape can be cured to provide the same cover material as that of the resin molded product. Thereby, even if it makes it larger than the cross-sectional area of the electric wire group which penetrates the cross-sectional area of an electric wire exit, dustproof and waterproofing measures will be taken.

The UV curable tape has a structure in which an ultraviolet curable resin layer is laminated on a UV curable tape obtained by impregnating a resin nonwoven fabric with an ultraviolet curable resin, or a resin tape layer made of vinyl chloride, a polyolefin resin, a polyamide resin, a fluorine resin, or the like. And the adhesion layer is laminated | stacked on the one side outer surface. The resin tape layer may be a solid tape, but preferably has through-holes and slits for transmitting ultraviolet rays with a required interval.
Until the UV curing tape is irradiated with ultraviolet rays, the UV curable resin is in the form of a gel with flexibility, so it is wound around the wire outlet at the outer periphery of the wire outlet and is easily wound into a conical shape with a gradually reduced diameter. can do.
On the other hand, when it is irradiated with ultraviolet rays after being wound into a required shape, it is hardened and cannot be deformed, resulting in a structure similar to a rigid resin molded product. And since the UV curing tape used by this invention hardens | cures when it irradiates with an ultraviolet-ray instead of heating, there exists an advantage which does not have a thermal influence on an electric wire group.

The UV curable tape in which the nonwoven fabric is impregnated with the ultraviolet curable resin is preferably formed by continuously transporting the nonwoven fabric while being immersed in a storage tank of the ultraviolet curable resin, but the nonwoven fabric is coated with a spray, a roll coater or a knife coater. May be impregnated with an ultraviolet curable resin.
The UV curable tape in which the ultraviolet curable resin layer is laminated on the resin tape layer can be provided by, for example, providing a tape made of an ultraviolet curable resin in advance and laminating and fixing the ultraviolet curable resin tape to the resin tape.

As the ultraviolet curable resin,
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).
An ultraviolet curable resin having a dark part curability is used.

As the ultraviolet curable resin having dark part curability blended with the chain transfer agent (B), 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 that is located in a dark part where irradiation light does not reach and can cure a part where no radical is generated, and the ultraviolet curable material (A) and the chain transfer agent (B). And an ultraviolet polymerization initiator (C).
In addition, even when an ultraviolet light transmission inhibitor made of organic / inorganic fillers, carbon / metal particles, fibers, polymers / oligomers, various modifying additives, and the like is blended, the whole can be reliably cured.

The ultraviolet curable resin and the nonwoven fabric have heat resistance that does not melt at 120 ° C. or lower. The nonwoven fabric preferably has a fluorine resin such as PTFE, PET, and PEI having a melting point of 200 ° C. or higher and rigidity, and an adhesive resin is blended with the fluorine resin. The density of the nonwoven fabric in the range of 100g ^{/ m 2} ~250g ^/ m 2 is preferably adjusted depending on the application in the range.

The non-woven fabric impregnated with the UV curable resin having the dark part curable property does not require heat treatment or moisture curing treatment, and the dark part where the ultraviolet ray is blocked can be cured by the chain transfer agent and impregnated with the UV curable resin. The entire part can be quickly cured including the dark part.
Therefore, UV curing tape made of non-woven fabric impregnated with UV curable resin having dark part curable property or UV curable tape provided with UV curable resin layer having dark part curable property is cured in a state of being partially wrapped around in a cone shape. Then, the tape part which becomes a dark part side can also be hardened | cured and it will be in the state in which the cone-shaped cover member which has rigidity as a whole was provided.
Specifically, the non-woven fabric impregnated with the UV curable resin blended with the chain transfer agent, for example, is irradiated with UV light for 10 seconds with a UV lamp, and the portion irradiated with the lamp is instantly cured, and the UV lamp The dark part where the light does not reach can be cured by leaving it for several tens of seconds.

As a second invention, formed by the wire fixing method of the first invention,
The entire circumference of the wire outlet is surrounded by the protrusion and the winding start side of the UV curable tape, and the winding end side of the UV curable tape is in close contact with the outer periphery of the wire group, and is formed of the UV curable tape. The extension outlet member provides an electric junction box electric wire fixing structure in which the electric wire drawn out from the electric wire outlet is covered in a sealed state.

The protrusion protrudes from the peripheral edge of the wire outlet of the case, the one protrusion being a fixed protrusion, and the other being a movable protrusion protruding through a thin hinge, or flexible Two-color molding is performed with a resin having a property to form a movable protrusion,
The UV curable tape may be wound around the outer surfaces of the fixed protrusion and the movable protrusion in a state where the movable protrusion is inclined toward the fixed protrusion and the electric wire insertion space is adjusted.

  As described above, when the movable protrusion is provided, the amount of protrusion of the movable protrusion and the fixed protrusion can be increased, and the length of supporting the UV curable tape wound in a cone shape by the fixed protrusion and the movable protrusion is increased. It is possible to increase the strength of the extension outlet member.

It is preferable that a tape holding protrusion is provided on the outer surface of the protrusion, and an edge in the width direction of the UV curable tape wound around the outer surface of the protrusion is brought into contact with the tape holding protrusion.
As a result, it is possible to prevent the UV curable tape wound around the protrusion from slipping off.
The protrusion for holding the tape may be one stage, and may hold the first winding UV curable tape on the winding start side, or may be provided in a plurality of stages such as 1 to 3 at intervals, and wound 1 to 3 times. It may be possible to hold the UV curable tape to be used.

  As described above, in the present invention, the electric wire outlet provided in the electric junction box is set as a large electric wire outlet corresponding to the cross-sectional area of the derived electric wire group that has the maximum cross-sectional area in the design, and By reducing the cross-sectional area by wrapping the UV curing tape around the outer periphery of the electric wire group led out from the electric wire outlet and curing it by ultraviolet irradiation, by providing an extended outlet member that continuously decreases in diameter from the electric wire outlet, The space exposed to the outside is eliminated from the large wire outlet, and the wire is fixed to the extension outlet member. As a result, it is possible to absorb the change in the cross-sectional area of the electric wire group led out from the electric connection box, and it is not necessary to provide a case with a different electric wire outlet or a separate electric wire holding member. Can be reduced.

The electrical junction box of 1st Embodiment of this invention is shown, (A) is a schematic sectional drawing, (B) is a bottom view. The fixed part of the electric wire derived | led-out from the said electrical-connection box is shown, (A) is sectional drawing which shows the state which wound the UV hardening tape after the electric wire was derived | led-out, (B) is a principal part expansion perspective view after hardening a UV hardening tape. FIG. 4C is an enlarged cross-sectional view of the main part, and FIG. 4D is an enlarged cross-sectional view of the wound UV curing tape. (A) is schematic which shows the formation method of UV hardening tape, (B) is drawing which shows UV hardening tape. (A) (B) is drawing which shows 2nd Embodiment of this invention. (A) (B) is drawing which shows 3rd Embodiment of this invention. It is a schematic sectional drawing which shows a prior art example. (A) and (B) are drawings showing other conventional examples.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show a first embodiment of the present invention.
An in-vehicle electrical junction box 1 shown in FIGS. 1A and 1B accommodates a case body 2 in which electrical components (not shown) such as relays and fuses are mounted in a lower case 3 and an upper case 4. . A plurality of electric wires 5 connected to the electric parts are led out from the case body 2 to the lower case 3, converged toward the electric wire outlet 10 provided on the bottom wall 3 a of the lower case 3, and drawn outward through the electric wire outlet 10. .

As shown in FIG. 1 (B), the shape of the wire outlet 10 is a square hole, and a rectangular cylindrical tape winding projection 11 is provided so as to protrude from the entire periphery thereof. The wire outlet 10 may be circular and provided with a cylindrical protrusion.
The protrusion amount L of the protrusion 11 is set such that a UV curing tape 15 described later can be wound about three times. The size (cross-sectional area) of the wire outlet 10 is a size corresponding to the maximum area in the design of a state in which a large number of wires 5 led out from the electrical junction box 1 are converged (hereinafter referred to as a wire group W). In the state where the wire group having the maximum area is led out through the wire outlet 10, it is set so that almost no excess space is generated at the wire outlet 10. The number of wires 5 constituting the wire group W led out from the electrical connection box 1 varies depending on the vehicle grade and the like, and in the case of a high grade equipped with a large number of optional electrical components, the number of wires 5 increases and Maximum cross-sectional area. On the other hand, when the middle grade is further reduced, the number of the wires 5 is reduced, the cross-sectional area is gradually reduced, and a gap is generated at the wire outlet 10 through which the wire group W passes.

  A wire group W drawn from the inside of the lower case 3 through the wire outlet 10 and the hollow portion of the square cylindrical projection 11 is fixed using a UV curing tape 15 as shown in FIG. A taper-cured extension outlet member 16 that is continuous with the protrusion 11 is provided by hardening the tape 15, and the protruding end side of the extension outlet member 16 is brought into close contact with the outer peripheral surface of the wire group W so as to be dustproof and waterproof. Yes.

The UV curable tape 15 is configured as shown in FIG. 3B, and an adhesive layer 23 is provided on one surface of a UV impregnated layer 20 in which a nonwoven fabric 21 is impregnated with an ultraviolet curable resin 22. As shown in FIG. 3 (A), the UV curable tape is impregnated with the nonwoven fabric 21 immersed in a storage tank 24 of the ultraviolet curable resin 22, but the ultraviolet curable resin may be applied by spraying or a roll coater. Good.
Nonwoven 21 is formed by blending a resin having excellent made adhere to the resin main component made of a fluorine-based resin, the density is in the range of ^{100g / m 2 ~250g / m 2} , the thickness of the nonwoven fabric 21 The range is 1 mm to 2.5 mm. The nonwoven fabric 21 is impregnated with the ultraviolet curable resin 22 in the entire thickness direction, but when the nonwoven fabric 21 is thick, the one surface side is impregnated with the ultraviolet curable resin and the other surface side is exposed to the ultraviolet light. The cured resin may not be impregnated.

As the ultraviolet curable resin 22, an ultraviolet curable resin having dark portion curability is used. The UV curable resin having dark part curability 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). And the ingredients.

The chain transfer agent (B) is composed of a metal complex compound containing (a) a compound containing at least one selected from a urethane bond, a urea bond, and an isocyanate group, and (b) 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 where the irradiation light, which has been difficult to cure in the past, cannot be reliably cured. 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- Thione-4,5-dithiolato) zinc complex, disodium ethylenediaminetetraacetate, zinc diphenyldithiocarbamate (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), ethylenediaminetetraacetic acid disodium cobalt, hexaammine cobalt (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. Raised over time. Thereafter, a small amount was sampled, FT-IR was measured, and stirring was continued at 50 ° C. while confirming the absorption of isocyanate near 2300 cm −1. The reaction was terminated when the absorption disappeared. 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 was sampled, FT-IR was measured, and stirring was continued at 50 ° C. while confirming the absorption of isocyanate near 2300 cm −1. The reaction was terminated when the absorption disappeared. 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.
Commercially available products of the ultraviolet polymerization initiator (C) include, for example, 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 not impairing 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.

  The UV curable tape 15 obtained by laminating the UV impregnated layer 20 impregnated with the ultraviolet curable resin 22 and the adhesive layer 23 on the nonwoven fabric 21 is integrated with the UV curable resin 22 before the ultraviolet curing. It has overall flexibility and flexibility before curing.

  As shown in FIG. 2, the UV curing tape 15 leads the wire group W from the inside of the lower case 3 through the hollow portion of the wire outlet 10 and the rectangular cylindrical projection 11, and then UV cures on the outer peripheral surface of the projection 11. Tape 15 is wound around. As shown in FIG. 2C, the UV curable tape 15 is wrapped around the outer peripheral surface of the protrusion 11 toward the protruding end 11e while being partially wrapped.

  The UV curing tape 15 is wound while gradually reducing the diameter so as to continuously surround the wire group W from the winding portion of the protruding end 11e of the protrusion 11, and the winding is terminated by closely contacting the outer peripheral surface of the wire group W. At the time of winding, the adhesive layer 23 is wound around the outer surface of the projection 11 with the inner surface side, and the UV impregnated layer 20 in which the nonwoven fabric 21 is impregnated with the UV curable resin 22 is positioned on the outer periphery. Since the UV curable tape 15 is uncured before being irradiated with ultraviolet rays and has flexibility, it can be easily wound.

  After wrapping the UV curable tape 15 from the outer peripheral surface of the protrusion 11 so as to surround the wire group W, the UV curable tape 15 is placed on the outer peripheral side with an ultraviolet irradiation lamp (manufactured by SEN Special Light Source) 17 as shown in FIG. Irradiate from. The ultraviolet curable resin 22 impregnated in the UV curable tape 15 by the ultraviolet irradiation is cured, and the UV curable tape 15 is cured in a wound state. As a result, as shown in FIG. 2 (B), a conical extension outlet member 16 surrounding the wire group W can be formed continuously with the rectangular cylindrical projection 11 surrounding the wire outlet 10. Since the inner peripheral surface on the protruding end side of the extension outlet member 16 is in close contact with the outer peripheral surface of the electric wire group W, the electric wire group W is fixed to the inner peripheral surface of the extension outlet member 16 that is cured in the close contact state. .

When the ultraviolet irradiation lamp 17 is irradiated, the UV impregnated layer 20 of the UV curing tape 15 on the outer peripheral side is cured. Further, since the UV curable tape 15 is wrapped and wound, the portion of the UV impregnated layer that becomes a dark portion without being irradiated with ultraviolet rays on the inner peripheral side is also cured because the impregnated ultraviolet curable resin 22 has dark portion curable properties. Go.
By the irradiation of the ultraviolet rays, the ultraviolet curable resin 22 on the surface side of the UV impregnated layer 20 that is directly exposed to the ultraviolet rays is dried and cured almost instantaneously. Although the curing time of the ultraviolet curable resin in the portion hidden by the fibers of the nonwoven fabric 21 is slightly delayed, it cures in several tens of seconds.

  As described above, the wire outlet 10 provided in the lower case 3 of the electrical junction box 1 is enlarged so that it can be shared even if the amount of the wire increases or decreases, and the UV curing is wound around the wire group W led out through the wire outlet 10. The tape 15 is cured by irradiating with ultraviolet rays, and an extension outlet member 16 is provided which is connected to the protrusion 11 on the periphery of the wire outlet 10, and the wire group W is fixed to the extension outlet member 16. Since the tip is in close contact with the outer peripheral surface of the electric wire group, dustproof and simple waterproofing can be achieved. Thus, there is no need to change the lower case 3 to be molded according to the cross-sectional area of the drawn wire group W, and the wire group can be used in a state where no gap is generated at the wire outlet 10 while the lower case 3 is shared. Can be fixed. And since the extended outlet member 16 continuing to the protrusion 11 is hardened and given rigidity, even if there is an outer member that interferes with the electric wire group led out from the electric wire outlet, there is no need to protect it with a corrugated tube or the like. Material can be eliminated.

4A and 4B show a second embodiment.
In the second embodiment, the protrusions 11 protruding from the peripheral edge of the wire outlet 10 are provided facing left and right, and one protrusion is a fixed protrusion 11A, and the other is a thin hinge part 13 through the thin-walled hinge portion 13. The movable protrusion 11B is provided so as to protrude from the periphery. The wire insertion space is made to have a size corresponding to the cross-sectional area of the wire group W by inclining toward the fixed protrusion 11A according to the cross-sectional area of the wire group W leading out the movable protrusion 11B.

  The electric wire group W led out from the electric wire outlet 10 is sandwiched between the fixed protrusion 11A and the movable protrusion 11B and led outward, and then the UV curable tape 15 is wound around the outer surfaces of the fixed protrusion 11A and the movable protrusion 11B. And since the protrusion does not protrude from the upper and lower end edges of the wire outlet 10 sandwiched between the fixed protrusion 11A and the movable protrusion 11B, the winding start side of the UV curable tape 15 wound around the outer surface of the fixed protrusion 11A and the movable protrusion 11B Then, a part of the width direction of the UV curable tape 15 is adhered to the upper and lower side edges of the electric wire outlet 10 so that the entire circumference of the electric wire outlet 10 is surrounded by the UV curable tape 15, the fixed protrusion 11A, and the movable protrusion 11B. Yes.

  As described above, when the movable protrusion 11B is provided, the protruding amount of the movable protrusion 11B and the fixed protrusion 11A can be increased, and the UV curing tape 15 wound in a cone shape can be supported for a long time by the fixed protrusion 11A and the movable protrusion 11B. The strength of the extended outlet member 16 can be increased.

5A and 5B show a third embodiment of the present invention.
In the third embodiment, the movable protrusion 11B is formed by a resin having flexibility, and is formed by two-color molding, unlike the resin for forming the case including the fixed protrusion 11A.
In addition, tape holding protrusions 30 are provided on the outer surfaces of the fixed protrusion 11A and the movable protrusion 11B, respectively. As shown in FIG. 5B, when the UV curable tape 15 is wound around the outer surfaces of the fixed protrusion 11A and the movable protrusion 11B, the edge in the width direction of the UV curable tape 15 is placed on the tape holding protrusion 30 and wound. The UV curable tape 15 is prevented from slipping off.
In the present embodiment, the tape holding protrusions 30 are provided in three stages at upper and lower positions with an interval between them, and the tape holding protrusions 30 are held up to the portion of the UV curable tape 15 that is wound three times. It is good also as a structure which makes it 1 step | paragraph and hold | maintains the lower end edge of the UV hardening tape 15 wound once on the winding start side.

DESCRIPTION OF SYMBOLS 1 Electrical connection box 3 Lower case 5 Electric wire 10 Electric wire exit 11 Protrusion 11e Protruding end 11A Fixed protrusion 11B Movable protrusion 15 UV curable tape 20 UV impregnation layer 21 Nonwoven fabric 22 UV curable resin 23 Adhesive layer W Electric wire group

Claims (5)

A protrusion for tape winding is provided from the periphery of the wire outlet opening in the case of the electrical junction box, and a UV curable resin layer is applied to the UV curable tape or resin tape layer in which the nonwoven fabric is impregnated with an ultraviolet curable resin as a tape to be wound around the protrusion. Using laminated UV curable tape,
The UV curable tape is wound around the outer surface of the protrusion, and continuously wound outward from the tip of the protrusion so as to surround the wire outlet and the electric wire surrounded by the protrusion. Is wound in a conical shape so as to gradually approach the outer peripheral surface of the electric wire and is brought into close contact with the outer peripheral surface of the electric wire and terminated.
Electrical connection for fixing the wire group to the inner peripheral surface of the extended outlet member by irradiating and curing the wound UV curing tape with ultraviolet rays to form a conical extension outlet member that covers the electric wire drawn out from the electric wire outlet How to fix the wire in the box. The ultraviolet curable resin used for the UV curable tape 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 wire fixing method for an electrical junction box according to claim 1, which is an ultraviolet curable resin having a dark part curability. Formed by the method of claim 1 or claim 2,
The entire circumference of the wire outlet is surrounded by the protrusion and the winding start side of the UV curable tape, and the winding end side of the UV curable tape is in close contact with the outer periphery of the wire group, and is formed of the UV curable tape. A wire fixing structure for an electrical junction box in which the wire drawn from the wire outlet is covered with an extended outlet member in a sealed state. The protrusion protrudes from the peripheral edge of the wire outlet of the case, the one protrusion being a fixed protrusion, and the other being a movable protrusion protruding through a thin hinge, or flexible Two-color molding is performed with a resin having a property to form a movable protrusion,
The wire fixing of the electric junction box according to claim 3, wherein the UV curable tape is wound around the outer surface of the fixed protrusion and the movable protrusion in a state where the movable protrusion is inclined toward the fixed protrusion and the electric wire insertion space is adjusted. Construction.   5. A tape holding protrusion is provided on the outer surface of the protrusion, and the end edge in the width direction of the UV curable tape wound around the outer surface of the protrusion is brought into contact with the tape holding protrusion. The electric wire fixing structure of the electrical junction box described.

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