JP2014154378A - Exterior coating method of wire harness, and wire harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exterior coating material for being wound around a wire harness, which has new shielding properties and a route regulating function.SOLUTION: An exterior coating method includes: winding a nonwoven fabric around the outer peripheral surface of a plurality of electric wire groups constituting the wire harness; covering the outer peripheral surface of the nonwoven fabric with a metal braid material formed of a metal braided sheet or a metal braided tube; impregnating the nonwoven fabric with an ultraviolet curing resin; subsequently irradiating the wire harness with ultraviolet rays while keeping the wire harness in a shape meeting a routing path; and curing the nonwoven fabric and the metal braid material into a required shape.

Description

  The present invention relates to a wire harness exterior method and a wire harness formed by the method, and more particularly, to a sheath material having a shield function and a shape retaining property of a wire harness routed in an automobile and also having a path regulation function.

  Conventionally, resin corrugated tubes, round tubes, protectors, and electric wires are used as exterior materials for bundling wire harnesses composed of multiple wire groups routed to automobiles, route regulation, and protecting against interference with other parts. Adhesive tape wrapped around the group is used. In a long wire harness, the above-described plural types of exterior materials are properly used according to the required function. For example, the trunk line of the wire harness is covered with a corrugated tube, the branch line is covered with a round tube or wrapped with adhesive tape, and is further covered with a protector, particularly where protection from external interference materials is required. .

Further, when it is necessary to shield the wire harness, the electric wire itself is a shielded electric wire, and an exterior material that has a shield function for covering the entire wire harness that focuses the electric wire and also has a path regulation function is not provided.
In order to provide a shield function and restrict the path of the wire harness, it is necessary to pass a metal case (metal protector). Or the method of heating and hardening a nonwoven fabric after using a nonwoven fabric as an exterior material and winding this nonwoven fabric around a shield electric wire can be considered.

  Although the shield function is not provided, the applicant of the present invention disclosed in Japanese Patent Application Laid-Open No. 2012-196035, as shown in FIGS. 4 (A) and 4 (B). The second protective members 101 and 102 are used as exterior materials. Specifically, after the first protective member 101 is wound around the electric wire W, the first protective member 101 is set in a molding device composed of an upper and lower mold, and is heat-molded by hot pressing, and then the second protective member is attached to a plurality of first protective members 101. 102 is wound, and then set in a molding apparatus consisting of upper and lower molds, and is hot-molded by a hot press.

JP 2012-196035 A

  When the nonwoven fabric of Patent Document 1 is heated and cured in a state of being wound around an electric wire (shielded wire), it differs depending on the material of the nonwoven fabric, but it is necessary to heat at a required temperature by incorporating a heater in the mold, and In the state where the non-woven fabric is wound around the electric wire, the electric wire W is also heated at the time of heating twice of the heat curing of the first protective member and the heat curing of the second protective member. Therefore, since it is necessary to heat at a relatively low temperature so as not to affect the electric wire W, the heating time becomes long and the work time may be increased.

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide a wire harness exterior method having a shield function and a shape regulating force and having a path regulating function, and a wire harness formed by the method. Yes.

In order to solve the above problems, as a first invention,
Wrap a non-woven fabric around the outer peripheral surface of a plurality of electric wire groups constituting the wire harness,
Next, the outer peripheral surface of the nonwoven fabric is covered with a metal braided material made of a metal braided sheet or a metal braided tube,
Next, the nonwoven fabric is impregnated with an ultraviolet curable resin,
Thereafter, the wire harness is held in a shape along the wiring path, irradiated with ultraviolet rays, and the nonwoven fabric and the metal braided material are cured to a required shape, and a wire harness exterior method is provided. Yes.

In the step of impregnating the non-woven fabric with the ultraviolet curable resin, the non-woven fabric and the metal braided material are sheathed and immersed in a melted ultraviolet curable resin storage tank.
In place of the dove dipping, an ultraviolet curable resin may be applied with a roll coater or a knife coater. However, in the state where a nonwoven fabric and a metal braided material are wound around a long wire harness, the wire harness is dipped in a storage tank. However, the working time can be shortened by using the conveying method.

The metal braided material composed of the metal braided sheet or the metal braided tube is made of the same material as the material for forming the shield layer in the shielded electric wire. In the shielded electric wire, the metal braided material is wrapped around the core electric wire and covered with a sheath made of an insulating resin. In the present invention, the outer periphery of the nonwoven fabric wound around the electric wire group not having the shield layer is covered with the metal braided material, and the electric wire group Is shielded with exterior material.
Either a metal braided sheet or a metal braided tube may be used as the metal braided material. However, when the exterior length is long, the exterior can be easily wrapped by winding the metal braided sheet. On the other hand, when the exterior length is short, the metal braided tube is held in a wound state, so that fixing such as tape winding is not necessary, so that the exterior can be easily performed.

As a second invention,
Wrap a non-woven fabric impregnated with UV curable resin around the outer peripheral surface of a plurality of electric wire groups constituting the wire harness,
Next, the outer peripheral surface of the nonwoven fabric is covered with a metal braided material made of a metal braided sheet or a metal braided tube,
Thereafter, the wire harness is held in a shape along the wiring path, irradiated with ultraviolet rays, and the nonwoven fabric and the metal braided material are cured to a required shape, and a wire harness exterior method is provided. Yes.

  In the first invention, after the wire harness is sheathed with the nonwoven fabric and the metal braid, the nonwoven fabric is impregnated with the ultraviolet curable resin. In the second invention, the nonwoven fabric is impregnated with the ultraviolet curable resin in advance. Even if the nonwoven fabric is impregnated with the ultraviolet curable resin, the nonwoven fabric can be easily wound around the outer peripheral surface of the wire harness because it is a gel having flexibility before the ultraviolet irradiation.

  Even if it uses the exterior method of the wire harness of the said 1st invention and the 2nd invention, it can shield with an exterior material and make it harden, without making the electric wire itself which comprises a wire harness into a shield electric wire. The route of the harness can be restricted, and both the shield function and the route restriction function can be achieved.

  In addition, since the metal braided sheet or the metal braided tube is cured in a state where the metal braided sheet or the metal braided tube is in the inner layer side, it is not necessary to fix the metal braided sheet or the metal braided tube to the nonwoven fabric with an adhesive or the like. Furthermore, since the metal braided material comprising the metal braided sheet or the metal braided tube is located on the outermost surface, the wear resistance can be improved.

  Furthermore, when it is desired to leave a portion having flexibility in a state of being wound around the wire harness, the portion need not be irradiated with ultraviolet rays, and flexibility and shape retention can be provided in divided regions. Therefore, urethane sheets, rubber sheets, and other exterior materials such as corrugated tubes that are conventionally used where flexibility and flexibility are required, and resins that are conventionally used where rigidity and path regulation functions are required It can be set as the exterior material which can integrate with the exterior material which consists of a protector of a molded article. Thus, only one type of exterior material of the present invention is required, and the number of types of exterior materials for wire harnesses can be reduced, and the work process can be simplified.

  Moreover, although the nonwoven fabric of the said patent document 1 is hardened | cured by heating, since the nonwoven fabric used by this invention is impregnated with the ultraviolet curable resin, it is hardened | cured by irradiating with an ultraviolet-ray instead of heating. Therefore, there is no need to heat at a high temperature such as 130 to 150 ° C., and there is an advantage that the electric wire is not affected by heat.

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). When,
It is preferably an ultraviolet curable resin having a dark part curability.

Since the net-like metal braiding material is positioned on the outer surface of the nonwoven fabric, the ultraviolet curable material can be irradiated with ultraviolet rays from the outside through the mesh to the nonwoven fabric impregnated with the ultraviolet curable resin. Therefore, the ultraviolet curable material is not blended with the chain transfer agent (B). It is also possible to use an ultraviolet curable resin that does not have dark part curability, in which the ultraviolet polymerization initiator (C) is blended with (A).
However, in order to reliably cure the entire nonwoven fabric impregnated with the ultraviolet curable resin in a short time, it is preferable to impregnate the nonwoven fabric with an ultraviolet curable resin having dark portion curability blended with the chain transfer agent (B).

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, 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 nonwoven fabric impregnated with the UV curable resin having dark portion curable properties does not require heat treatment or moisture curing treatment, and when a part of the ultraviolet curable resin impregnated into the nonwoven fabric is irradiated with ultraviolet rays and cured, the ultraviolet rays are blocked. The dark part can also be sequentially cured by the chain transfer agent, and the entire part impregnated with the ultraviolet curable resin can be rapidly cured including the dark part.
Therefore, only by irradiating ultraviolet rays from the outside to the wire harness wound with the ultraviolet curable resin having dark portion curable properties, the portion located on the dark side of the inner surface of the nonwoven fabric and the opposite side where the ultraviolet rays irradiated by the wire harness are blocked It can be cured sequentially. Specifically, the non-woven fabric impregnated with the UV curable resin blended with the chain transfer agent, for example, when UV irradiation is performed with a UV lamp for 10 seconds, 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.

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.

  An adhesive layer may be provided on the inner surface side of the nonwoven fabric layer. The pressure-sensitive adhesive layer is formed by applying a resin having adhesiveness or laminating and fixing a pressure-sensitive adhesive film made of the resin having adhesiveness. As described above, when the adhesive layer is provided, the adhesive layer can be fixed by simply attaching the adhesive layer to the outer peripheral surface of the wire harness and winding, and operations such as winding of the metal braiding material and ultraviolet irradiation in the subsequent work are facilitated.

As a third invention, the wire harness formed by the wire harness exterior method of the first invention or the second invention,
In the region where the wire harness is sheathed with a sheath material having a shielding property composed of the nonwoven fabric impregnated with the ultraviolet curable resin and the metal braided material, and the wire harness is bent, the exterior material together with the wire harness is A wire harness characterized by being cured in a bent state is provided.

  As described above, in the present invention, a non-woven fabric is wound around the outer peripheral surface of the wire harness, the outer peripheral surface of the non-woven fabric is covered with a metal braided material made of a metal braided sheet or a metal braided tube, and the non-woven fabric is impregnated with an ultraviolet curable resin, The wiring harness is held in a wiring shape, irradiated with ultraviolet rays to cure the nonwoven fabric, and the exterior material composed of the outer metal braided material is held together with the nonwoven fabric in the required shape. The exterior material is shielded by the metal braided material. In addition, the ultraviolet curable resin impregnated in the non-woven fabric is cured to provide a shape retention force and to have both a shield function and a path regulation function. Therefore, it is not necessary to use a shielded wire, and it is not necessary to use a metal protector or the like.

  In particular, when the non-woven fabric is impregnated with dark-curing UV curable resin, the inside of the non-woven fabric impregnated with the UV curable resin and the back side opposite to the irradiation side are cured simply by irradiating the wire harness with UV light from a certain position. There is an advantage that the curing operation can be easily performed.

It is a perspective view of the wire harness armored with the exterior method of a 1st embodiment of the present invention, (A) is an expansion perspective view and (B) is a perspective view at the time of bending a wire harness. It is drawing which shows the exterior method of the said wire harness. It is drawing which shows the exterior method of the wire harness of 2nd Embodiment. It is drawing which shows a prior art example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a first embodiment.
FIG. 1 shows a wire harness 1 formed by the wire harness exterior method of the present invention, which is formed by the method shown in FIG.

First, the outer periphery of the electric wire group 2 in which a large number of generally used cross-section electric wires W whose core wires are covered with an insulating resin is bundled is covered with the nonwoven fabric 3.
Subsequently, the outer periphery of the nonwoven fabric 3 is covered with a metal braided sheet 4 of a shielding material.
Next, the non-woven fabric 3 is impregnated with a dark-curing UV curable resin 5 and is covered with an exterior material 6 composed of the nonwoven fabric 3 and the metal braided sheet 4.
Next, the wire group 2 is held in a wiring shape in the vehicle (that is, the bent portion is held in a bent state, and when there is no bent portion, is held in a straight line), and the ultraviolet curable resin 5 impregnated in the nonwoven fabric 3 is applied. The nonwoven fabric 3 is cured by irradiating ultraviolet rays from the outside.

  In the step of impregnating the nonwoven fabric 3 with the ultraviolet curable resin 5, as shown in FIG. 2, the storage tank 9 is put in a storage tank 9 in a molten state, and the nonwoven fabric 3 and the metal braided sheet 4 are wound around the wire group 2. The nonwoven fabric 3 is impregnated with the ultraviolet curable resin 5 by so-called dipping. Instead of dipping, it may be applied using a roll coater or the like.

  In the ultraviolet irradiation step, as shown in FIG. 2, the ultraviolet irradiation lamp (manufactured by SEN Special Light Source) 17 irradiates from a fixed position outside the metal braided sheet 4. Since the ultraviolet curable resin 5 is dark-curing, the ultraviolet rays impregnated in the nonwoven fabric 3 wound around the entire circumference including the side and the lower side with respect to the inner side and the irradiation side where the ultraviolet rays are not irradiated with the chain transfer agent (B) described later. The cured resin 5 is cured. Thereby, the whole electric wire group 2 will be in the state coat | covered with the exterior material 6 hardened | cured in the cylinder shape.

Specifically, when the ultraviolet irradiation lamp 17 is irradiated, ultraviolet rays hit the ultraviolet curable resin 5 through the gaps in the outermost metal braided sheet 4 and through the gaps in the fibers of the nonwoven fabric 3, and curing starts. The chain transfer agent (B) cures the inside where the ultraviolet rays are blocked by the nonwoven fabric fibers and the side and lower portions where the ultraviolet rays are not irradiated from the portion where the curing has started.
The ultraviolet curable resin 5 on the sheet portion directly exposed to ultraviolet rays is dried and cured almost instantaneously by the irradiation of the ultraviolet rays. The curing time of the ultraviolet curable resin on the dark side or on the opposite side is slightly delayed, but cures in several tens of seconds.

  In addition, as described above, the part that needs to bend the wiring harness on the vehicle is bent in the state where the exterior material 6 is wound, and is cured by irradiating ultraviolet rays in this bent state, It has a bent cylindrical shape and the same shape as a bent protector made of a resin molded product.

  Thus, the exterior material 6 composed of the nonwoven fabric 3 and the metal braided sheet 4 is cured in a cylindrical shape, and is bent and cured together with the wire group 2 at a required location. Thereby, the metal braided sheet 4 is arranged on the outermost peripheral surface to have a shielding function, and the wire harness 1 is covered with the outer packaging material 6 having a shape-retaining function with a cured nonwoven fabric 3 and having a path regulation function. .

  The nonwoven fabric 3, the metal braided sheet 4, and the dark part curable ultraviolet curable resin 5 as the exterior material will be described in detail below.

The nonwoven fabric 3 is formed by blending a resin having excellent adhesion 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 3 Is in the range of 1 mm to 2.5 mm.
The nonwoven fabric 3 is applied to the entire surface of the winding side surface or the surface that overlaps when wound, and is held in a wound state when it is wound around the outer periphery of the electric wire group 2 with sushi or bonded.

  The metal braided sheet 4 is a sheet formed by knitting metal wires in a mesh shape that is widely used as a shielding material, and has a high mesh shielding function and a high shielding function. The metal braided sheet 4 is bonded and wound around the outer periphery of the nonwoven fabric 3 wound around the outer periphery of the electric wire group 2, and an adhesive is applied to the bonded surface so as to be held in a wound state.

The dark part curable ultraviolet curable resin 5 impregnated in the nonwoven fabric 3 is an ultraviolet curable resin having dark part curable properties in which an ultraviolet curable material (A), a chain transfer agent (B), and a photopolymerization initiator (C) are blended. .
Hereinafter, the ultraviolet curable resin 5 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 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- 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 matter 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.

  In the first embodiment, the metal braided sheet 4 is used as the shielding material. However, when the wire harness is relatively short, a metal braided tube may be used.

FIG. 3 shows a second embodiment.
In the second embodiment, the nonwoven fabric 3 is impregnated with the ultraviolet curable resin 5 before the nonwoven fabric 3 is wound around the electric wire group 2. Thereafter, the metal braided sheet 4 is wound around the outer peripheral surface of the nonwoven fabric 3 impregnated with the ultraviolet curable resin 5, and then irradiated with ultraviolet rays.
The wire harness formed by the method of the second embodiment has the same configuration as the first embodiment and has the same advantages.

In both the first and second embodiments, the entire length of the exterior material is cured, but an uncured region may be provided without being irradiated with ultraviolet rays. Since this non-irradiated region is flexible without being cured, it can easily follow the wire harness during wiring. That is, when it is necessary to provide a region for maintaining flexibility in a part of the wire harness, the region is maintained without being irradiated with ultraviolet rays, and is cured by being irradiated with ultraviolet rays in other regions.
Thus, even if one continuous nonwoven fabric 3 metal braided sheet 4 is wound around the electric wire group 2, the cured exterior material, flexibility and bending can be obtained by coexisting the region irradiated with ultraviolet rays and the region not irradiated with ultraviolet rays. It is possible to have a function of packaging a packaging material having a property.

  Further, when the wire harness is made of a flat harness in which conductors are wired in parallel and covered with a laminate film, the flat harness may be packaged with the exterior material of the present invention. And can give.

  Moreover, in the said 1st, 2nd embodiment, although the non-woven fabric is impregnated with the dark part curable ultraviolet curable resin blended with the chain transfer agent (B) as the ultraviolet curable resin 5, the chain transfer agent (B) is blended. Instead, the ultraviolet curable resin (A) may be impregnated with an ultraviolet curable resin containing the ultraviolet polymerization initiator (C). In this case, it is necessary to irradiate the entire circumference of the wire harness with ultraviolet rays in order to cure the ultraviolet curable resin impregnated in the nonwoven fabric of the exterior material wound around the outer periphery of the wire group.

DESCRIPTION OF SYMBOLS 1 Wire harness 2 Electric wire group 3 Nonwoven fabric 4 Metal braiding sheet 5 UV curable resin

Claims (5)

Wrap a non-woven fabric around the outer peripheral surface of a plurality of electric wire groups constituting the wire harness,
Next, the outer peripheral surface of the nonwoven fabric is covered with a metal braided material made of a metal braided sheet or a metal braided tube,
Next, the nonwoven fabric is impregnated with an ultraviolet curable resin,
Thereafter, the wire harness is held in a shape along the wiring path, irradiated with ultraviolet rays, and the nonwoven fabric and the metal braided material are cured to a required shape, and the wire harness is packaged. Wrap a non-woven fabric impregnated with UV curable resin around the outer peripheral surface of a plurality of electric wire groups constituting the wire harness,
Next, the outer peripheral surface of the nonwoven fabric is covered with a metal braided material made of a metal braided sheet or a metal braided tube,
Thereafter, the wire harness is held in a shape along the wiring path, irradiated with ultraviolet rays, and the nonwoven fabric and the metal braided material are cured to a required shape, and the wire harness is packaged. 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 exterior method of the wire harness according to claim 1, wherein the method is an ultraviolet curable resin having a dark portion curability.   The wire harness by which the said exterior material is hardened | cured partially or entirely with the wire harness formed by the method of any one of Claim 1 thru | or 3.   A wire harness formed by the method according to any one of claims 1 to 3, wherein the exterior material is cured in a state where a required portion is bent together with an electric wire group.

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