JP2007052992A - Water cut-off treatment method of vehicle-mounted electric wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To carry out water cut-off treatment of a vehicle-mounted electric wire more rapidly and steadily. <P>SOLUTION: Water cut-off treatment of the vehicle-mounted electric wire (for example, grounding wire 10) is carried out by a water cut-off treatment method including a water cut-off agent supply process in which a cut-off agent 1, with a property of promoting hardening by a specific hardening treatment (for example, irradiation of light) and fluidity at an initial state, is supplied to one of the terminals of the vehicle-mounted wire, a decompression process in which the air inside a covering material 14 is sucked and decompressed from the other terminal of the vehicle-mounted wire during and after supply of the cut-off agent 1 so that the other portion of the cut-off agent 1 supplied may penetrate inside the covering material 14 while a part of the cut-off agent is exposed at one of the terminals of the vehicle-mounted wire, and a cut-off agent hardening process in which, after the decompression process, the cut-off agent 1 exposed at one of the terminals is applied a hardening treatment (for example, irradiation of light by an optical irradiation device 50) and the surface of at least the exposed cut-off agent 1 is hardened. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a technique for performing a water stop treatment on an in-vehicle electric wire mounted on a vehicle.

  Some of the on-vehicle electric wires are required to have high waterproof properties. For example, a grounding wire for connecting an electric circuit provided in a vehicle or the like to a grounding terminal is connected to a suitable grounding part (for example, a vehicle body) with the grounding terminal fixed to the terminal exposed to the outside. Therefore, moisture easily enters from the terminal, and if the moisture enters the circuit through the inside of the covering material, there is a possibility that normal operation of the circuit is hindered.

Therefore, as a method for performing a water-stop treatment of an in-vehicle electric wire including such a grounding electric wire, the following Patent Document 1 supplies a water-stopping agent having fluidity to one end of the in-vehicle electric wire. A method is disclosed in which the other end is sucked and the water-stopping agent is drawn into the gap between the conductor of the in-vehicle electric wire and the covering material.
JP 2004-355851 A

  Here, in the said patent document 1, it is said that what has fluidity | liquidity at the time of supply, and hardens | cures after supply and a viscosity increases is suitable as a water stop agent supplied to one terminal of the said vehicle-mounted electric wire. As a specific example of the material, a naturally curable silicone resin is cited.

  However, in the case of the method of Patent Document 1 in which the supplied water-stopping agent is naturally cured, a highly fluid water-stopping agent is placed on the one terminal side immediately after the water-stopping agent is filled inside the coating material. It may flow backward and the water stop structure may collapse. For this reason, after filling with the water-stopping agent, it was necessary to wait for a while until the water-stopping agent was naturally cured to some extent. Of course, if you select a material that spontaneously cures quickly as the water-stopping agent, you can reduce the waiting time for the curing, but if you select a material that has a too fast curing rate, the water-stopper will penetrate sufficiently into the wire. It will not be possible to do so, rather it will reduce the water stop performance. For this reason, there was a limit to shortening the time required for the water stop treatment by using a water stop agent that spontaneously hardens quickly.

  This invention is made | formed in view of such a situation, and it aims at performing the water stop process of the vehicle-mounted electric wire more rapidly and reliably.

  As means for solving the above-mentioned problems, the present invention provides a method for water-stopping an in-vehicle electric wire mounted on a vehicle having a coating material on the outside of the conductor, and one of the in-vehicle electric wires. A water-stopping agent supplying step of supplying a water-stopping agent having a property that the hardening is promoted by being subjected to a specific hardening process and having fluidity in an initial state, and the supplied water-stopping agent The other end of the in-vehicle electric wire during or after the supply of the water-stopping agent so that the other portion penetrates into the inside of the covering material while a part of the in-vehicle electric wire is exposed to the one end of the in-vehicle electric wire From the decompression step of sucking and decompressing the air inside the covering material from, and after the decompression step, by applying the curing treatment to the waterproofing agent exposed to the one terminal, at least the exposed waterproofing agent Including a water-stopper curing process for curing the surface. And it is characterized in (Claim 1).

  According to the water stop treatment method for an in-vehicle electric wire, a part of the water stop agent having a property that the hardening is accelerated by being subjected to a specific hardening treatment and having fluidity in the initial state is provided inside the coating material. The remaining part is exposed to one end of the in-vehicle electric wire, and at least the surface of the exposed water stopping agent is forced by applying the curing treatment to the water stopping agent exposed to the one end. Therefore, when the curing process is completed, it is ensured that the water-stopping agent drawn inside the coating material flows backward to the one terminal side and the water-stopping structure is destroyed. As a result, it is possible to construct a stable water stop structure more quickly and reliably than the conventional water stop treatment method in which it is necessary to wait for the water stop agent to naturally cure. Moreover, since the water-stopping agent is forcibly hardened by performing a hardening treatment, the water-stopping agent that spontaneously hardens relatively quickly in order to shorten the time required for the water-stopping treatment in the conventional water-stopping treatment method. Unlike the case of using the water-stop agent, the fluidity of the water-stop agent necessary for the water-stop agent to permeate the inside of the coating material is reliably maintained during the decompression step. As a result, high water-stopping performance can be obtained more reliably.

  In addition, although the kind and arrangement | positioning location of the said vehicle-mounted electric wire are not specifically limited, The electric wire for earthing for connecting the circuit mounted in a vehicle to earth | ground is mentioned as a preferable thing (Claim 2). .

  According to this configuration, since the water stop treatment can be performed on the grounding wire, the terminal of the grounding wire that is generally connected to a ground part (for example, the body of the vehicle) that is easily affected by the external environment of the vehicle. It is possible to prevent moisture from entering the opposite terminal.

  However, the water stop treatment method according to the present invention is not limited to the grounding wire, and is, for example, a type in which moisture is likely to enter the inside of the covering material, such as a splice wire from which the covering material is peeled off in the middle of the wire. Even if the connector is provided with a waterproof function, it can be suitably used for a circuit connected to a circuit that requires a particularly high waterproof property.

  Here, as the water-stopping agent having the property that curing is accelerated by the specific curing treatment, for example, a water-stopping agent having photocuring properties can be suitably used. In this case, the curing process in the water stopping agent curing step may be performed by irradiating the water stopping agent exposed to the one terminal with light (Claim 3).

  In addition, as the water-stopping agent having a property that curing is accelerated by the specific curing treatment, a water-stopping agent having a thermosetting property can be used. In this case, the curing process in the water stopping agent curing step may be performed by heating the water stopping agent exposed to the one terminal (claim 4).

  Here, as the water-stopping agent, it is preferable to use a water-stopping agent having a property of spontaneously curing at a rate slower than the curing rate when the curing treatment is performed (Claim 5).

  In this way, by providing the water-stopping agent with natural curing characteristics, the water-stopping agent drawn into the inside of the coating material and difficult to be subjected to the curing treatment is also used. Since it can harden | cure reliably, it can prevent that the filling position of the water stop agent inside a coating | covering material shifts at the time of electric wire use, and can maintain a water stop structure more stably. In addition, since the curing rate at the time of natural curing is set to be slow, the water-stopping agent cannot sufficiently penetrate into the coating material due to the natural curing of the water-stopping agent during the decompression step. Is effectively avoided.

  In addition, the water-stopper curing step leaves at least a water-stopper that is necessary to cover at least a gap between the conductor and the covering material at the terminal among the water-stopper exposed at the one terminal, and the remaining excess. It is preferable to carry out after removing the water-stopping agent (Claim 6).

  According to this configuration, since the surface area of the water-stopping agent in the portion to be cured by light irradiation or heating is reduced, the time required for the water-stopping agent hardening process can be shortened, and the vehicle-mounted electric wire can be stopped more quickly. Water treatment can be performed.

  As described above, according to the water stop treatment method for in-vehicle electric wires of the present invention, the water stop treatment for in-vehicle electric wires can be performed more quickly and reliably.

  A preferred embodiment of the present invention will be described with reference to the drawings.

  In addition, although this embodiment demonstrates the method of carrying out a water stop process to the electric wire for earth | ground for connecting the circuit mounted in the vehicle to earth | ground, this invention is not limited to this, The various waterproofness in which high waterproofness is calculated | required It can also be applied to in-vehicle electric wires.

  The water stopping method for grounding wires according to this embodiment includes the following steps.

1) Terminal crimping process This process is a process of crimping and fixing the ground connection terminal 20 to one end of the grounding electric wire 10 as shown in FIGS.

  As the grounding wire 10, an insulated wire having a covering 14 around the conductor 12 is used. Then, the covering material 14 at one end is removed by a predetermined length to expose the conductor 12.

  A ground connection terminal 20 as shown in FIGS. 1A and 1B is fixed to the end of the ground wire 10 by pressure. The illustrated ground connection terminal 20 is formed of a single metal plate, and integrally includes a ground connection portion 21 connected to a vehicle body ground, a conductor barrel 22 and an insulation barrel 24. The ground connection portion 21 is provided with a bolt insertion hole 21a through which a not-illustrated bolt can be inserted, and the ground connection portion 21 is fastened to the vehicle body by the bolt to be electrically connected to the body. (Ie connected to the body ground).

  In a state where both the barrels 22 and 24 of the ground connection terminal 20 are opened, the end of the grounding wire 10 from which the covering material 14 has been removed as described above is set, and then the conductor barrel 22 and the insulation barrel 24. Are closed and fixed to the conductor 12 and the covering material 14 by crimping.

2) Water-stopping agent supplying step This step supplies the water-stopping agent 1 to one terminal of the grounding wire 10 (the terminal on the side where the ground connection terminal 20 is fixed), as shown in FIG. It is a process to do. Specifically, the water-stopping agent 1 is dropped by a dispenser (not shown) so that the water-stopping agent 1 is stored between the conductor barrel 22 and the insulation barrel 24 of the ground connection terminal 20. In addition, this dripping position can be appropriately set according to the terminal structure.

  The dripping of the water-stopping agent 1 may be performed once, but when the pressure reducing process described later is started, the water-stopping agent 1 penetrates into the inside of the covering material 14 and accumulates on the ground connection terminal 20. Since the amount of the water-stopping agent 1 gradually decreases, it is preferable to drop the water-stopping agent 1 in a plurality of times by dropping the water-stopping agent 1 so as to replenish it. Thereby, a sufficient amount of the water-stopping agent 1 is uniformly filled in the gap between the conductor 12 and the covering material 14 while keeping the amount of the water-stopping agent 1 collected on the ground connection terminal 20 substantially uniform. can do.

  The water-stopping agent 1 has fluidity in the initial state, but is made of a material that cures when irradiated with light (has photocuring characteristics).

  The fluidity of the water-stopping agent 1 in the initial state may be such that the water-stopping agent 1 can permeate into the coating material 14 during the decompression step described later. Specifically, if the initial viscosity is about 0.006 to 6 Pa · s, the waterstop agent 1 can be infiltrated into the coating material 14 by reducing the pressure for about 5 to 120 seconds at a pressure of about 10 kPa to 100 kPa. It has been confirmed that.

  And in the water-stopping agent 1 after receiving the light irradiation and hardening, it is sufficient that the viscosity is increased to such an extent that at least the form of the water-stopping agent 1 is stably maintained. However, the water-stopping agent 1 after the photocuring preferably has a certain degree of elasticity (flexibility) in order to avoid cracking or breakage of the water-stopping agent 1 when an external force is applied to the terminal portion during wiring. . In addition, the curing rate when the water-stopping agent 1 is photocured is preferably relatively fast in order to shorten the time required for the water-stopping treatment.

  Here, even if the water-stopping agent 1 has photocuring properties as described above, the portion of the water-stopping agent 1 that is filled deep inside the coating material 14 is cured by receiving light irradiation. Is difficult. Therefore, it is preferable that the water-stopping agent 1 has a property of naturally curing. Thereby, it is prevented that the filling position of the water-stopping agent 1 inside the covering material 14 is shifted when the electric wire is used. In this case, the water-stopping agent 1 filled in the covering material 14 is excellent in elasticity (flexibility) even after natural curing so that the water-stopping agent 1 can be deformed by following the bending of the electric wire. Is preferred. In addition, if the curing rate at the time of natural curing is too high, the water-stopping agent 1 will not sufficiently penetrate into the inside of the coating material 14, so that the water-stopping agent 1 is at least faster than the curing rate at the time of photocuring. Those that spontaneously cure at a slow speed are preferred. In addition, as long as the water-stopper 1 is a thing with comparatively high viscosity from an initial state, the property may hardly change over time from the time of supply.

  As such a water-stopping agent 1, for example, an ultraviolet curable silicone resin is suitable. This ultraviolet curable silicone resin generally contains a polyfunctional silicone oligomer as a main component containing a photopolymerization initiator (for example, a benzophenone-based, benzoin-based, acetophenone-based compound, etc.) When irradiated, the photopolymerization initiator is excited to generate radicals for polymerizing the silicone oligomer. Such an ultraviolet curable silicone resin preferably further has the above-mentioned natural curing characteristics. For this purpose, for example, a curing catalyst that accelerates the curing reaction in the presence of moisture in the air is further added. What is necessary is just to make it contain in the said silicone oligomer.

  However, the material of the water-stopping agent 1 is not limited to such an ultraviolet curable silicone resin, and various materials can be used as long as they have photocuring characteristics and fluidity in the initial state. Is possible. Examples of such a material include a polyfunctional monomer or oligomer such as an epoxy resin, polyurethane, polyester, or polybutadiene acrylate containing a photopolymerization initiator as described above. Moreover, the water stop agent 1 may not be hardened | cured by an ultraviolet-ray, and may be hardened | cured by visible light or a laser beam.

3) Depressurization step This step is a step of sucking air inside the covering material 14 from the other end of the ground wire 10 (the end opposite to the end to which the ground connection terminal 20 is fixed). Thereby, the water-stopping agent 1 supplied in the water-stopping agent supply step is forcibly permeated inside the covering material 14.

  In this decompression step, the water-stopping agent 1 is accumulated between the conductor barrel 22 and the insulation barrel 24 on the ground connection terminal 20 by the first dripping in the water-stopping agent supply step, and the water-stopping agent 1 is connected to the terminal. It is preferable to start after the gap between the conductor 12 and the covering material 14 is covered over the entire circumference. In this way, the water-stopping agent 1 can be drawn into the gap between the conductor 12 and the covering material 14 in a stable state while effectively preventing air from being caught in the water-stopping agent 1.

  In addition, this decompression step may be performed individually for each grounding wire 10, but in this embodiment, it is performed simultaneously for a plurality of grounding wires 10. Specifically, as shown in FIG. 2, the other end of the plurality of grounding wires 10 is connected to a common wire connecting device 30, and the wire connecting device 30 is connected to the suction pump via the pressure control panel 42. By connecting to the suction port 44, a pressure reducing step is simultaneously performed on each of the grounding wires 10. If it does in this way, a series of processes (water stop agent supply process, pressure reduction process, and water stop agent hardening process mentioned below) for water stop processing can be simultaneously performed to a plurality of grounding electric wires 10. It is possible to improve the efficiency of the water stop treatment.

  An electric wire connection device 30 shown in FIG. 2 includes a housing 32 whose inside is sealed, and a sealed space in the housing 32 is connected to a suction port of the suction pump 44 via an appropriate pipe 40 and the pressure control panel 42. Has been.

  A rubber stopper holding plate 34 is provided on the front wall of the housing 32. The rubber stopper holding plate 34 holds a plurality of rubber stoppers 36 as shown in FIG. Each rubber plug 36 is connected to the terminal of each grounding wire 10.

  Specifically, the rubber plug holding plate 34 is provided with a plurality of rubber plug mounting holes 34a penetrating in the thickness direction, and the rubber plugs 36 are respectively fitted in the rubber plug mounting holes 34a. Yes.

  Each rubber plug 36 is formed in a cylindrical shape having a through hole 36a on its central axis, and a sealing protrusion 36b is formed on the inner peripheral surface of the through hole 36a. The sealing protrusion 36b plays a role of maintaining a sealed state in the housing 32 by being pressed against the surface of the covering material 14 of the grounding wire 10 inserted into the through hole 36a. Similarly, a sealing protrusion 36c is formed on the outer peripheral surface of the rubber plug 36, and the sealing protrusion 36c is pressed against the inner peripheral surface of the rubber plug mounting hole 34a to provide a seal.

  A rubber plug cover 38 that covers the outer peripheral portion of the rubber plug 36 from the outside is provided at the outer end of each rubber plug mounting hole 34 a. The rubber plug cover 38 is grounded in the through hole 36 a of the rubber plug 36. A taper-shaped through hole 38a for guiding the end of the electric wire 10 is provided at the center.

  In this electric wire connecting device 30, the other end of each earthing wire 10 (opposite side to the end to which the earth connecting terminal 20 is fixed) is inserted into the through hole 36 a of the rubber plug 36 at the back through the through hole 38 a of each rubber plug cover 38. These terminals can be connected to a common sealed space in the housing 32 by press-fitting the terminal. Then, the inside space of the covering material 14 in each grounding wire 10 is also simultaneously reduced by reducing the pressure in the sealed space under the control of the pressure control panel 42 until the suction pump 44 operates to a certain negative pressure. The pressure can be reduced.

  The decompression step as described above ends before the water-stopping agent 1 dripped at the end completely penetrates the inside of the covering material 14. Thereby, the water-stopping agent 1 after the pressure-reducing step is in a state where a part of the water-stopper 1 is exposed to the wire terminal and the other part penetrates into the inside of the covering material 14.

4) Water-stopping agent curing step This step is to irradiate the water-stopping agent 1 exposed to one terminal of the grounding wire 10 (the terminal on the side to which the ground connection terminal 20 is fixed) after the decompression step. Is a step of forcibly curing at least the surface of the exposed water-stopping agent 1.

  Specifically, as shown in FIG. 5, the light irradiating device 50 irradiates light to the water-stopping agent 1 exposed at the one terminal. As this light irradiation apparatus 50, the thing which generate | occur | produces appropriate types of light, such as an ultraviolet-ray, visible light, a laser beam, according to the photocuring characteristic of the water-stopping agent 1 is used. For example, when an ultraviolet curable silicone resin is used as the water-stopping agent 1, a material that generates ultraviolet rays may be used as the light irradiation device 50. An example of such an ultraviolet irradiation device is a high-pressure mercury lamp.

  The light irradiation by the light irradiation device 50 is a stop necessary for covering at least the gap between the conductor 12 and the covering material 14 in the water-stopping agent 1 exposed at the one terminal, as shown in FIG. It is preferable to carry out after removing the remaining water-stopping agent 1 by wiping or suctioning (suctioning from the outside of the electric wire) or the like leaving the liquid agent 1. Thereby, since the surface area of the waterproofing agent 1 of the part which should be hardened by light irradiation becomes small, the time which this waterproofing agent hardening process requires can be shortened. However, even if the extra water-stopping agent 1 is not forcibly removed in this way, if the decompression process is continued for a certain period of time after the last dripping of the water-stopping agent 1, It is possible to reduce the amount. However, in that case, it is necessary to finely adjust the decompression time.

  When the water-stopping agent curing process as described above is completed, as shown in FIG. 6 which is an enlarged cross-sectional view of the terminal portion on the ground connection terminal 20 side of the ground wire 10, the exposed portion of the water-stopping agent 1 and the vicinity thereof are The photocuring part 1a is formed by photocuring. The thickness of the photocuring portion 1a can be adjusted by increasing or decreasing the irradiation time of the light irradiation device 50. The longer the irradiation time, the larger the thickness of the photocuring portion 1a. When this photocured portion 1a is formed, the gap between the conductor 12 and the covering material 14 at the terminal is closed by the photocured portion 1a (in the illustrated example, the conductor 12 is composed of a plurality of conductor strands 12a). In addition, the gap between the conductor strands 12a is also closed by the photocuring portion 1a), so that the inner filling portion 1b, which is a portion of the water blocking agent 1 filled inside the covering material 14, is It is prevented from flowing back and leaking outside. In the case where a water-stopper 1 is used which has a relatively low viscosity in the initial state and is naturally cured relatively slowly, when the water-stopper curing step is completed, the inner filling portion 1b is sufficiently cured naturally. (In other words, the inner filling portion 1b has a certain degree of fluidity), but even in such a case, if the photocured portion 1a is formed as described above, the inner filling portion 1b is not formed. Will not leak to the outside, so the water-stop structure will not collapse significantly. Therefore, when this water-stopper curing process is completed, the grounding wire 10 can be sent to the next process (for example, inspection process, shipping / packaging process, etc.) without waiting for the natural curing of the inner filling portion 1b. is there.

  As described above, according to the water stop treatment method for the grounding electric wire 10 of the present embodiment, a part of the water stop agent 1 having photocuring characteristics and fluidity in the initial state is placed inside the covering material 14. By pulling in and exposing the remaining part to one terminal (terminal on the side where the ground connection terminal 20 is fixed) of the grounding wire 10 and irradiating the water-stopping agent 1 exposed to the terminal with light Since at least the surface of the exposed water-stopping agent 1 is forcibly and quickly cured to form the photocuring portion 1a, the light covering portion 14 of the water-stopping agent 1 of the water-stopping agent 1 is formed when this light irradiation is completed. The photocuring portion 1a can reliably prevent the inner filling portion 1b, which is a portion drawn inward, from flowing backward to the one terminal side and the water-stopping structure from collapsing, and as a result, the water-stopping agent 1 I need to wait for natural hardening Compared to conventional waterproofing processing method Tsu can be constructed more quickly and reliably stable water stopping structure. And since it is the structure which hardens the water stop agent 1 by irradiating light in a water stop agent hardening process, in order to shorten the time which a water stop process requires in the conventional water stop treatment method, it is comparatively Unlike the case where the water-stopping agent 1 that spontaneously cures quickly is used, the fluidity of the water-stopping agent 1 that is necessary for the water-stopping agent 1 to permeate the inside of the covering material 14 is reliably maintained during the decompression step. Therefore, even when a water-stopper 1 having both natural curing characteristics is used, the fluidity of the water-stopper 1 is maintained by setting the cure rate at the time of natural cure slower. An amount of the water-stopping agent 1 can be infiltrated into the inside of the covering material 14, and as a result, high water-stopping performance can be obtained more reliably.

  In the present embodiment, the water-stopping agent 1 having a photo-curing property is used. However, the water-stopping agent 1 is not limited to this as long as it has the property of being cured by applying a specific curing treatment. For example, you may use what has the thermosetting characteristic hardened | cured by heating. Such thermosetting materials are widely known, and an example thereof is a thermosetting silicone resin containing a thermosetting catalyst (for example, a platinum catalyst) that accelerates a polymerization reaction under heating conditions. . Of course, the thermosetting water-stopping agent 1 is not limited to such a thermosetting silicone resin, and a material appropriately selected from various materials having thermosetting characteristics can be used. In addition, when such a thermosetting material is used as the water-stopping agent 1, the water-stopping agent curing step is performed, for example, by blowing warm air to the water-stopping agent 1 exposed at the one terminal. It is possible.

  Moreover, in this embodiment, although the water-stopping agent supply process is performed after connecting the ground connection terminal 20 by the terminal crimping process, this can be performed before the connection of the ground connection terminal 20. However, in that case, since the ground connection terminal 20 cannot be used as a water-stopping agent receiver as described above, the supply of the water-stopping agent 1 may become unstable. Still, the water-stopping agent 1 can be stably supplied by supplying the water-stopping agent 1 while separately attaching some jig for receiving the water-stopping agent 1 to the wire terminal.

  Furthermore, the terminal to be fixed in the terminal crimping step is not necessarily the ground connection terminal 20, but may be a terminal (for example, a terminal connected to the vehicle load side) fixed to the terminal on the opposite side. . Also in this case, it is possible to construct a good water stop structure at a position inside the electric wire from the terminal. However, in this case, there is a possibility that moisture may enter the coating material 14 in the region from the ground connection portion to the water stop structure of the terminal on the opposite side, whereas the ground connection is performed as described above. If a water stop agent is supplied to the terminal on the side where the terminal 20 is fixed (that is, the inlet side of moisture entering from the ground connection portion), there is an advantage that moisture can be almost surely prevented from entering the inside of the covering material 14. can get.

  Here, although the color of the water-stopping agent 1 is not particularly mentioned, for example, a colored water-stopping agent 1 mixed with a colorant may be used. If it does in this way, it will become possible to discriminate | determine easily visually whether it is the electric wire which performed the water stop process. However, when the water-stopping agent 1 is cured by light irradiation as in this embodiment, it is preferable to color the water-stopping agent 1 in a color that allows light to pass through relatively easily (for example, ultramarine blue transmits ultraviolet light). Easy to do).

The water stop treatment was performed under the following conditions by the method shown in FIGS.
・ Waterproofing agent: UV-curing silicone resin that has both moisture absorption and curing properties (natural curing properties) “TB-3161; manufactured by ThreeBond Co., Ltd.”
Viscosity before UV curing: 0.3 Pa · s
UV curing characteristics: 20 seconds at illuminance of 150 mW / cm ² → cured film thickness 6 mm
Moisture absorption and curing characteristics: 120 hours at 25 ° C and 55% humidity → cured film thickness 7 mm
・ Ultraviolet irradiation machine… 200W high-pressure mercury lamp φ3.0mm light guide “OMNICURE 2000; manufactured by EXFO”
Irradiation distance: 5cm
Illuminance: 1W / cm ²
・ Cross section area ... 1.25mm ²
・ Waterproofing agent dripping amount… 15mg
・ Pressure during decompression: -50kPa (gauge pressure)
・ Decompression time: 30 seconds from the start of dripping of the water-stopping agent ・ UV irradiation time: 5 seconds (irradiation starts after wiping off the excess portion of the water-stopping agent exposed to the terminal)

  After the water stop treatment was performed under the above conditions, it was confirmed by finger touch that the water stop agent exposed to the terminal portion was cured. Furthermore, when the terminal part was immersed in the water tank and air was blown from the terminal on the opposite side and a pressure of 50 kPa (gauge pressure) was applied, it was confirmed that no bubbles were generated in the water tank. .

(A) is a top view which shows the structure which crimped-fixed the ground connection terminal to one terminal of the electric wire for earth | ground concerning embodiment of this invention, (b) is the front view. It is a figure which shows the example of the apparatus for decompressing the inside of the coating | covering material in the said electric wire for earth | grounds. It is sectional drawing which shows the electric wire connection part of the electric wire connection apparatus shown by FIG. It is a figure showing the state which dripped the water stop agent on one terminal of the said electric wire for earthing | grounding. It is a figure showing the condition which is irradiating light to one terminal of the said electric wire for earth | ground using a light irradiation apparatus. It is an expanded sectional view of one end part of the electric wire for earthing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water stop agent 10 Electric wire for ground 12 Conductor 14 Coating | covering material

Claims (7)

A method for water-stopping an in-vehicle electric wire mounted on a vehicle having a coating material outside the conductor,
One end of the on-vehicle electric wire has a characteristic that curing is promoted by being subjected to a specific curing treatment, and in the initial state, a water-stopping agent supplying step of supplying a water-stopping agent having fluidity,
During or after the supply of the water-stopping agent, the other portion penetrates into the inside of the covering material in a state where a part of the supplied water-stopping agent is exposed at one end of the in-vehicle electric wire. A decompression step of sucking and decompressing the air inside the covering material from the other end of the in-vehicle electric wire;
After the pressure reduction step, the vehicle-mounted vehicle includes a water-stopping agent curing step of hardening at least the surface of the exposed water-stopping agent by performing the curing treatment on the water-stopping agent exposed to the one terminal. Water stop treatment method for industrial wires. In the water stop processing method of the electric cable for vehicles according to claim 1,
The on-vehicle electric wire is a grounding electric wire for connecting a circuit mounted on a vehicle to an earth, and a water stop treatment method for an on-vehicle electric wire. In the water stop processing method of the vehicle-mounted electric wire according to claim 1 or 2,
The water-stop agent supplying step is a step of supplying a water-stop agent having a photo-curing property as a property that curing is accelerated by the specific curing treatment being performed,
The water stopping agent curing step is a step of performing the curing treatment by irradiating the water stopping agent exposed to the one terminal with light. In the water stop processing method of the vehicle-mounted electric wire according to claim 1 or 2,
The water-stop agent supplying step is a step of supplying a water-stop agent having a thermosetting property as a property that the curing is accelerated by the specific curing treatment being performed,
The water stopping agent curing step is a step of performing the curing treatment by heating the water stopping agent exposed to the one terminal, and a water stopping treatment method for an in-vehicle electric wire. In the water stop processing method of the electric cable for vehicles according to any one of claims 1 to 4,
A water-stop treatment method for an in-vehicle electric wire, characterized in that a water-stop agent having a property of spontaneously curing at a rate slower than a cure rate when the curing treatment is performed is used as the water-stop agent. In the water stop processing method of the electric cable for vehicles according to any one of claims 1 to 5,
In the water-stopper curing step, of the water-stopper exposed at the one terminal, at least the water-stopper necessary for covering the gap between the conductor and the covering material at the terminal is left, and the remaining extra water-stopper is left. A water stop treatment method for an in-vehicle electric wire, which is performed after removing the liquid agent. An in-vehicle electric wire that is mounted on a vehicle with a covering material outside the conductor,
A vehicle-mounted electric wire, wherein a water-stopping agent is filled inside the coating material by the water-stopping treatment method according to any one of claims 1 to 6.

Images