JPH01154473A - Covering member for bonded member - Google Patents

Abstract

PURPOSE:To obtain excellent airtightness and to improve sealing property and work efficiency by forming a covering material by filling the inside of a supporting body with a sealing agent. CONSTITUTION:A supporting body 2 is of a shell structure integrally formed with two shell bodies 5, 5 to be capable of opening and closing, with each of the shell bodies 5 provided with a recess 8 to be filled with a sealing agent 3. As the sealing agent, either a jelly-like resin composition of ultraviolet rays solidifying type or foam-like hot melt agent may be used. As the inside of the supporting body 2 of the covering member 1 is filled with the sealing agent 3 in this way, a bonded portion of a bonded member is covered by causing the bonded portion of the bonded member to be interposed in the sealing agent 3 of the inside of the covering member 1 and by solidifying the sealing agent 3. This simplifies the covering work of the bonded portion and the bonded portion is sealed securely.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to connection parts of conductive wires such as electric wires and lead wires, connection parts of automobile wire harnesses, connection parts between conductive wires and control panels of electrical equipment, The present invention relates to a coating material that covers the connection parts of cables in plants, the connection parts of optical fiber cables, and the connection parts of connection members such as piping.

(Prior art) For example, automotive wiring harnesses include a main harness, side harness, engine subharness, rear harness, door harness, instrument harness, etc. These wiring harnesses connect many conductive wires. It consists of:

This connection of conductive wires can be carried out, for example, by removing the insulating coating from each conductor to be connected and leaving it in a bare wire state, and then bringing the bare wire parts into contact with each other and joining them using a metal bonding terminal, or by joining them in a hot state. Connect by direct fusion welding.

The connection part (connection part) of a harness that is such a connection member
In order to prevent metal corrosion from occurring due to water intrusion or salt damage, resulting in negative effects such as poor electrical connections or disconnections, these are covered with a coating material.

Examples of conventional covering materials and methods of covering the connecting portions of connecting members using the covering materials include the following.

■ Use insulating vinyl tape as a covering material and wrap this insulating vinyl tape around the joint.

(2) A thermoplastic resin is used as the covering material, and a: it is molded by extrusion molding and at the same time is solidified onto the connecting portion to seal the connecting portion.

b; Form into a sheet and heat-press it to the connection part.

c) Seal the container by injecting a heat-meltable resin into the container into which the connecting part is inserted.

(2) Using a heat-shrinkable tube as a covering material, the connecting portion is passed through the heat-shrinkable tube, and then a certain temperature is applied from the outside of the tube to shrink the tube.

(Problems to be Solved by the Invention) However, when the connecting portions of the connecting members are covered with the above-mentioned covering materials (1) to (3), there are the following drawbacks.

■ When wrapping tape around the joints of connecting members, it must be done with a considerable amount of tension first; otherwise, gaps will form between the wraps of the tape, resulting in poor sealing performance; If it is done manually, it is time consuming and has poor productivity, and the winding process requires skill.
Furthermore, since thermoplastic resins can only be handled in solid form once they reach room temperature, they cannot be moved to the next step until they reach room temperature.

b: The seal is incomplete due to poor followability and does not adhere tightly to the connecting portion, allowing water etc. to enter.

C: The connecting portion derails or breaks inside the container because the heat-meltable resin is injected and solidified while the connecting portion is inserted into the container.

■ Because the connecting member must be passed through the tube, it is time-consuming and difficult to work with, and gaps are likely to occur5.
Furthermore, once both ends of the connecting member are connected to other members, they cannot be passed through the tube, making it impossible to cover them.

In addition, since none of the above-mentioned covering materials are completely waterproof, it is necessary to route the harness into the passenger compartment, for example, to prevent water from entering the joints or poor connections or disconnections due to salt damage. so that the connecting part can be inserted into the passenger compartment. However, in this case, wiring the harness takes time, the harness becomes long and heavy, and moreover, it becomes necessary to secure a large space for the harness, which increases the cost.

(Means for Solving the Problems) In order to solve the above problems, the present invention forms a covering material by filling the inside of the support with a sealant.

(Function) Since the coating material is filled with a sealant inside the support body, by interposing the connection part of the connecting member in the sealant inside the coating material and curing the sealant, Since the connecting portions of the connecting members are coated, the work of covering the connecting portions is simplified and the connecting portions are reliably sealed.

(Example) Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a perspective view of a covering material of a connecting member showing a first embodiment of the present invention.

This covering material 1 is made by filling a support 2 with a sealant 3. As shown in FIGS. 2 to 4, the support 2 is made of a plastic molded product made by vacuum forming a plastic sheet such as polypropylene, and has two shells 5, 5 integrally formed so as to be openable and closable. It has a shell structure, and each shell body 5 has a recess 6 for filling the sealant 3.
(In Figures 1, 3, and 4, the outer side is labeled with a symbol for convenience.) Furthermore, each shell 5 is partially cut so that it can be bent when the connecting member is sandwiched. A bent portion 7 is formed.

As the sealant 3, for example, a jelly-like ultraviolet curable resin composition or a foam-like hot melt agent can be used. Note that when an ultraviolet curable resin composition is used as the sealant 3, the support 2 is formed of a material that can transmit ultraviolet rays.

The ultraviolet curable resin used as the sealant 3 is not particularly limited as long as it can be cured by ultraviolet irradiation, but
For example, epoxy resin, acrylic resin, polyurethane resin, and silicone resin can be used.

This ultraviolet curable resin can maintain a jelly-like state at least to the extent that it does not flow out from the support until it is cured after being filled into the support.

To make an ultraviolet curable resin into a jelly, a gelling agent is added to the ultraviolet curable resin. Examples of the gelling agent include acylamino acid derivatives, sorbitol derivatives, organic bentonite, asbestos powder, silica powder, and hydrogenated castor oil.

Examples of acyl amino acid derivatives include lauroyl glutamate dibutylamide, lauroyl glutamate distearylamide, lauroyl glutamate dilaurylamine salt, lauroyl glutamate dilauryl ester, cicapriloyl ricin laurylamide, cicapriloyl ricin laurylamine salt, and cicabroyl lisine lauryl ester. , lauroyl valine butyramide, lauroyl phenylalanine lauryl amide, lauroyl phenylalanine lauryl amine salt, etc. Among these, preferred is lauroyl glutamic acid dibutyl amide.

Further, examples of sorbitol derivatives include dibenzylidene sorbitol, benzylidene hydroxybenzylidene sorbitol, and the like.

The blending ratio of the gelling agent needs to be such that the ultraviolet curable resin is at least gelatinized to the extent that it does not run off from the support 4, but the amount varies depending on the type of gelling agent.For example, acylamino acid derivatives, The amount of the gelling agent added to the ultraviolet curable resin of the sorbitol derivative is 3 to 15 parts by weight per 100 parts by weight of the resin.

If the gelling agent is less than 3 parts by weight, it will not gel to the extent that it can be reliably retained within the support 4, and if it exceeds 15 parts by weight, it will exceed the limit of compatibility with the resin.

Foamy hot-melt agents are produced by heating and melting solid hot-melt agents and then mechanically converting them into gas hot-melt agents such as N2 or CO2 under certain pressurized conditions in a system that has prepared the conditions for foaming. When the hot-melt agent is mixed and melted, and then this hot-melt agent is discharged from a gun, the gas is foamed and a foamed hot-melt agent is obtained.

Examples of the hot melt agent include ethylene vinyl acetate resin, vinyl acetate resin, polyamide resin, polyolefin resin, acrylic resin, vinyl chloride resin, ethylene vinyl acetate copolymer resin, polyethylene resin, and polypropylene resin. It is possible to use resins whose main components are polybutadiene-based resins, polybutadiene-based resins, polyisoprene-based resins, and polyimide-based resins. As the hot melt agent, one of these resins may be used alone, or a mixture of two or more resins may be used. The hot melt agent may also contain various additives such as, for example, plasticizers, tackifiers, stabilizers, and the like.

Further, it is necessary that this foamy hot melt agent maintains its foam form for at least the time necessary for coating the connecting member and does not harden to the extent that it prevents the interposition of the connecting member.

Next, a method of covering the connecting portion of the connecting member using this covering material 1 will be explained. Note that the same drawings are referred to for both the case where an ultraviolet curable resin composition is used as the sealant 3 and the case where a foamy hot melt agent is used.

In addition, as a connection part of the connection member, for example, as shown in FIG. ．． An example of a Y-shaped joint of the joining conductor 8 will be explained, in which the bare wire portions of the wire W3 are brought into contact with each other and joined using a metal joining terminal (or directly fusion welded in a hot state).

First, when using an ultraviolet curable resin as the sealant 3, the support 2 is filled with a jelly-like ultraviolet curable resin composition 3 as a sealant, and the coating material 1 as shown in FIG. form.

Then, at an arbitrary time when the joint part of the joint conductor 8 is coated,
As shown in FIG. 6, with the shell 5 of the covering material 1 open, the figure-7 joint of the joining conductor 8 is connected to the ultraviolet curable resin composition 3 in one of the shells 5 of the support 2. After filling in the seventh
As shown in the figure, by closing the shells 5, 5 of the covering material 1, the joint portion of the joining conductor wire S is interposed in the jelly-like ultraviolet curable resin composition 3 filled inside the covering material 1. In this case, as shown in FIG. 8, after the support body 2 is closed, the shells 5, 5 may be integrally fixed with staples 8, 8.

At this time, an amount of the ultraviolet curable resin composition 3 corresponding to the volume of the joining conductor wire 3 is pushed away and moves in the direction shown by the arrow in FIG. Go in airtight.

Subsequently, at an arbitrary time, an ultraviolet ray irradiation machine is used to cure the ultraviolet curable resin 3 in the support 2 and apply the coating material 1 holding the bonding conductor 9 under irradiation conditions such that the joint portion of the bonding conductor S can be reliably sealed. The ultraviolet curable resin composition 3 filled in the support 2 of the coating material 1 is cured by irradiating ultraviolet rays from the outside, and the bonded portion of the bonding wire 3 is covered.

Next, when using a foamy hot melt agent as the sealant 3, first heat and melt the solid hot melt agent, and then pour the gas-mixed hot melt agent into the support 2 under pressure using a gun. By discharging the gas, the gas foams and the foamed hot melt agent 3 is filled into the support 2 to form a coating material 1 as shown in FIG.

Therefore, while the hot-melt agent 3 of the coating material 1 is not yet cured, in the same manner as described above, as shown in FIG. The joint part of the shape is buried in the hot melt agent 3 in one shell 5, and the seventh
As shown in the figure, by closing the other shell 5 that serves as the lid of the support 2, the joint of the joint groove [9 is inserted into the foam-like hot melt agent 3 filled inside the coating material 1]. In this case, as shown in FIG. 8, by closing the support body 2, the shells 5, 5 may be integrally fixed with staples 8, 8.

At this time, an amount of hot melt agent 3 corresponding to the volume of the joining conductor wire S is pushed away, and the second! 3F1 in the direction shown by the arrow, and airtightly enters the gap between each of the conductive wires W1 to W3 of the joining conductive wire 3.

Then, when the foam-like hot melt agent 3 in the coating material 1 reaches room temperature, the hot melt agent 3 hardens and covers the joint portion of the joint conducting wire 8.

When a foamed hot melt agent is used, it has the following advantages (1) to (4) when compared with non-foamed hot melt agents and other sealants.

■ The heated foamy hot melt agent has a small heat capacity on the surface when it is discharged and filled into the support 2, so the support is easily affected by temperature (for example, a support with a thin film wall thickness). Even when applied to a substrate, thermal deformation of the support does not occur.

Additionally, a support that can be easily obtained in large quantities by vacuum forming or the like can be used rather than an inexpensive plastic film.

■ Foamy hot-melt agents exhibit high thixotropic properties, so they do not easily cause natural cross-flow and do not drip.
Therefore, it is possible to apply the hot melt agent in a raised state even on the peripheral edge of the support, and as a result, when a shell-type support is used, when closing the shell-type support, a sufficient amount of hot melt agent can be applied to the support. 2 can be filled, and high sealing performance can be obtained.

■ The shell-shaped support 2, which is filled with heated foam-like hot melt, does not allow the foam-like hot melt to flow into the flow 11 even under working conditions such as being lifted and moved by hand or slightly tilted. Therefore, the sealing effect is ensured and the workability is also good.

■ Shell type support 2 filled with foamy hot melt agent
When closing a hot melt, it must be closed before the surface of the hot melt is cooled and solidified. However, unlike non-foamed hot melt, each foam of the foam hot melt covers about 100% of the insulation material. The heat dissipation is slowed down, the open time is extended, and the handling of the bonding work is facilitated.

(2) Non-formed hot melt cannot be filled in a heaping manner, and the liquid level is lower than the upper edge of the opening of the shell-shaped support 2, so when the support 2 is closed, a space is created inside. In this respect, the foamy hot melt agent can be piled up on the shell type support 2 and filled with a sufficient amount of the hot melt agent to ensure reliable sealing.

(2) The foam-like hot-melt agent filled in the shell-type support 2 is foam-like when the support 2 is open, so it does not cool easily and does not harden rapidly. However, when the support body 2 is closed, each form is destroyed by external force at that time, so the bonding area becomes wider, heat is rapidly dissipated, and the set time becomes shorter. This means long open hours.
Particularly when using a support having a joint surface, it is suitable for the work condition of short set time.

(2) When the shell-shaped support 2 filled with foamy hot-melt agent is closed, the adhesive layer becomes thinner at the adhesive surfaces between the ends of the shells, improving finishing accuracy.

■ Foamy hot-melt agents have a lower apparent viscosity than non-foamed ones, so less force is required to close the support, and with that less force it can smoothly enter the gaps between the bonding lines. In addition, the excess foamy hot melt agent extruded from the contact gap between the end of the shell and the conductor does not drip and instantly solidifies in place, so there is extremely little risk of contaminating components or the work area.

■ Foamy hot melt agent exhibits elasticity after cooling and assimilation.
This is because fine bubbles remain as closed cells and have elasticity, so they act as a covering material that has resilience even when pressure is applied, and has the effect of protecting the internal joints from external impacts. .

FIG. 10 is a perspective view showing another example of the support for the covering material 1. This support 10 has the same structure as the above-mentioned support 2, and also has convex portions 5at on corresponding parts of the surfaces of the shells 5, 5.
5a and recesses 5b, 5b are respectively formed so that when the shells 5, 5 are closed, the protrusion 5a fits into the recesses 5b, 5b and is locked in the closed state.

In this way, by providing a locking mechanism in the shell of the support that has a shell structure so that the shell is locked in the closed state when the support is closed, the shell of the support can be temporarily closed. It is easy to seal, which is convenient for preserving the coating material, and for example, when an ultraviolet curable resin composition is used, the connecting member can be easily sealed even if the ultraviolet curable resin composition filled inside is not cured. Work such as moving and handling becomes easier.

FIG. 11 is a perspective view of a covering material of a connecting member showing a second embodiment of the present invention.

This covering material 11 is formed by filling the inside of a support 12 with a sealant 13. The support 12 is made of a plastic molded product made by extruding a plastic sheet such as polypropylene, and as shown in FIG. Slit portion 15 for fitting or filling with sealant 13
is formed.

Note that this support body 12 may be one in which the slit portion 15 is formed by cutting the side portion of the cylindrical body 14 in the axial direction so that the slit portion 15 is formed by the expansion force of the tube body 14. The shape is not particularly limited as long as it can introduce the connecting member into the support 12 and retain the sealant 13 within the support 12.

As the sealant 13, for example, a jelly-like ultraviolet curable resin composition or a foam-like hot melt agent can be used, as in the first embodiment.

Note that when an ultraviolet curable resin composition is used as the sealant 13, the support 12 is formed of a material that can transmit ultraviolet rays.

A method of covering the connecting portion of the connecting member using this covering material 11 will be explained. Note that the same drawings are referred to for both the case where an ultraviolet curable resin composition is used as the sealant 13 and the case where a foamy hot melt agent is used.

First, when using a jelly-like ultraviolet curable resin composition as a sealant, the support 12 is filled with a jelly-like ultraviolet curable resin composition 13 as a sealant, as shown in FIG. A covering material 11 is formed.

Then, at an arbitrary time when the joint part of the joint conductor 3 is coated,
As shown in FIG. 13, a jelly-like material is formed by filling the inside of the covering material 11 with the figure 7-shaped joint of the joining conductor 9 as shown in FIG. It is embedded in an ultraviolet curable resin composition 13.

Subsequently, the support 12 is coated at an arbitrary time using an ultraviolet irradiation machine.
The coating material 11 holding the bonding conductor 9 is irradiated with ultraviolet rays from the outside under irradiation conditions that allow the jelly-like ultraviolet curable resin composition 13 inside to harden and reliably seal the connecting portion of the bonding conductor 3. A jelly-like ultraviolet curable resin composition 13 is filled into the support 12 of the material 11 and cured to cover the joint portion of the joint conductive wire 3.

Next, when using a foamy hot melt agent as a sealant, first heat and melt the solid hot melt agent, and then apply the gas-mixed hot melt agent under pressure to the support of the coating material 1 using a gun. By discharging the gas into the support body 12, the gas foams and the foamed hot melt agent 13 is filled into the support body 12, thereby forming the coating material 1 as shown in FIG.
form 1.

Therefore, until the hot melt agent 13 of this coating material 11 hardens, as shown in FIG. The shaped joint is interposed in a foamy hot melt agent 13 filled inside the coating material 11.

Then, when the foam-like hot melt agent 13 in the coating material 11 returns to room temperature, the hot melt agent 13 hardens and covers the joint portion of the joining conductor wire 9.

In this way, when the slitted cylindrical support 12 is used to fill the hot melt agent in the form of a foam, there is no need to close the support unlike in the case of a support with a shell structure. Immediately after filling the inside with the agent 13, the connection portion of the joining conductor is pushed into the hot melt agent 13 through the slit portion 15, and the hot melt agent 13 is allowed to cool and solidify to form a sealing coating, which further improves workability. This method is particularly suitable for connecting parts with relatively small wire diameters.

FIG. 14 is a front view showing another example of the support for this covering material 11.

This support body 17 has a single cut in the axial direction of the six cylindrical body 1B, and as shown in FIG. 15, this cylindrical body 1
A ring 19 that forms a slit portion 15 by engaging the cut end on the outer periphery of B and expanding it. When the ring is removed from the support body 17, the cylindrical body 18 closes itself by restoring force to close the slit portion 15, as shown in FIG. Therefore, by removing the ring 13 after burying the connecting portion of the connecting member in the sealant in the support body 17, the slit portion 15 is closed and the sealant is retained inside, which further improves workability. Note that the ring 1B can also be attached to the tool side, τ.

As described above, in the coating material for the connecting member according to the present invention, the inside of the support is filled with a sealant.

The connecting portion of the connecting member is coated by interposing the connecting portion of the connecting member in the sealant inside the coating material using this coating material and then curing the sealant. therefore,
The work of covering the connecting portion becomes easier and the connecting portion is reliably sealed.

In other words, when covering the joints of lead wires, etc.,
The required functions vary depending on the use of the wire, etc., but basically, the coating work must be completed in a short time, that is, when there are many work areas and many pieces to be worked on, each work time can be measured in minutes or hours. It is inefficient to do so, so it must be possible to complete the process in seconds, preferably within 10 seconds; ■ It does not require high skill; ■ The electrical insulation properties of the sheathing material must be on the same level as vinyl sheathing materials. .

■ Excellent adhesion to the conductor coating material.

■ Has excellent heat resistance and cold resistance.

(2) It is required that the sealant filled in the support does not flow out even when handled by humans or mechanical tools, and the coating material of the present invention fully satisfies these requirements.

Connection parts of connection members that can be coated with the coating material of the present invention include, for example, joints of conductive wires such as electric wires and lead wires, joints of automobile wire harnesses, joints between control panels of electrical equipment and conductive wires, and joints of conductive wires such as electric wires and lead wires. Examples include connecting portions of cables such as the like, connecting portions of optical fiber cables, connecting portions of piping, etc.

Note that the support constituting the coating material used in the present invention does not necessarily have to be transparent, but as described above, if the sealant filled inside the support is an ultraviolet curable resin, the support The body can be made of a material that allows ultraviolet rays to pass through. A transparent body with excellent permeability is preferable because the ultraviolet curable resin composition can be cured in a short time and reliably.

Further, the shape of the support is not limited to that of the above embodiment, but the shape of the support is such that the sealant is held inside.

It is preferable that the connecting member inserted therein is difficult to fall off and has a structure that allows it to easily pass through narrow spaces and holes. Furthermore,
For example, the coating material can be formed by using a sheet material such as a plastic film as a support and forming a jelly-like ultraviolet curable resin composition layer or a foam-like hot melt layer on this sheet-like support. .

Furthermore, the sealant is not limited to the above-mentioned jelly-like ultraviolet curable resin composition and foam-like hot melt agent, but in some cases, a hot melt resin or a liquid photocurable resin can also be used. .

Next, specific examples of the present invention will be described.

(Hereinafter, blank spaces) Arrow JMJIL The interior of the support was filled with an ultraviolet curable resin composition to form a covering material for the connecting member. The method for preparing the support and the ultraviolet curable resin composition is as follows.

(Support) A shell-shaped support 2 as shown in FIG. 1 was molded from a polypropylene sheet (manufactured by Dainippon Ink and Chemicals Co., Ltd.) having a thickness of 0.8 m using a vacuum forming method. Note that the polypropylene used contained no ultraviolet absorber in its components.

(Ultraviolet curable resin) An ultraviolet curable resin composition was prepared as Sealant 3 using the following components and blending ratios.

Bisphenol A type epoxy resin (Cyracyu 7 U
VR-6405, U, C, product name manufactured by C Company)...60 parts by weight alicyclic epoxy resin (Silacure UV I-6110
, U, C, C (product name)...40 parts by weight allyl sulfonium salt (Cyracure UVl-6974,
(Product name manufactured by U, C, C)...0.8 parts by weight Siloxane compound (KBM 703. Part name manufactured by Shin-Etsu Chemical Co., Ltd.)...4 parts by weight Benzsorbitol derivative (Gelol D.

(Product name manufactured by Shin Nippon Rika Co., Ltd.) ...1.5 parts by weight. To obtain an ultraviolet curable resin composition, the components in the above proportions are homogeneously stirred and mixed at 90°C to 100°C for 15 minutes or more. did.

(Formation of coating material) Approximately 1.5 g (approximately 1.36 cc) of the ultraviolet curable resin composition 3 was placed in the recess 6 of each shell 5, 5 of the support 2 under a temperature condition of 90°C to 100°C. The container was filled and left to stand until the temperature reached room temperature, and the ultraviolet curable resin composition 3 was jelly-formed to form a coating material 1. Note that the ultraviolet curable resin composition may be forcibly cooled to form a jelly.

(Embedding of the connecting member) Next, the connecting member was buried in the covering material 1 obtained above as described below.

As a connecting member, a conductive wire (TR-64X10 type) is used.

A bonded conductor wire made by Shinjo Electric Wire Co., Ltd. (trade name) was used. Approximately 10W of the polyvinyl chloride coating layer at the tips of the two conductive wires was removed, and the bare wire portions were joined by soldering or electrothermal welding to form a figure-7 joint as shown in Figure 5. A bonded conducting wire 8 was obtained.

After the 7-shaped joint of the joining conductor 9 is buried in the jelly-like ultraviolet curable resin composition 3 filled in one shell 5 of the support 2 of the covering material 1, it becomes the lid of the support 2. The other shell 5
is closed, the 7-shaped joint of the joining conductor 8 is interposed in the jelly-like ultraviolet curable resin composition 3, and an amount of the ultraviolet curable resin composition 3 corresponding to the volume of the joining conductor 9 is pushed away. It was moved in the direction shown by the arrow in Figure S, and entered into the gap between the joining conductor wires 3.

At this time, as shown in FIG. 8, the two shells 5, 5 of the support 2 were closed and fixed at two locations with copper staples 5L-10.

Subsequently, the covering material 1 holding the bonding conductive wire 3 is irradiated with ultraviolet rays under the irradiation conditions shown in Table 1 using an ultraviolet irradiator (Model DHD-500CM, manufactured by Oak Co., Ltd.) to support the covering material 1. The ultraviolet curable resin composition 3 filled in the body 2 was cured.

The bonded wire obtained in Example 1 with the bonded portion sealed with coating material 1 was subjected to the following evaluation test, and the results are shown in Table 1.

Assurance of workability: The time required to coat the joint portion of the joint conductor wire 8 was measured.

Measurement of Mechanical Strength The tear strength of the joint of the bonded wire was measured using an Instron testing machine. In addition, the tensile speed in this test (
load) is 50 wn/min.

Sealing property test: When embedding the bonding conductor 8 in the covering material 1, Hisipal type A (part name manufactured by M Glass Co., Ltd.) (2 diameter) was applied as a spherical silica gel desiccant for packaging to the joint of the bonding conductor 9. Five grains were fixed, the shell 5 serving as the lid of the support 2 was closed, and the joint of the joint conductor 8 was coated as in Example 1 above to prepare a sealing test sample.

Subsequently, this sample was immersed in water at room temperature for 24 hours, and then the presence or absence of discoloration of the silica gel was checked. In this case, those in which the silica gel did not change color were considered to have sufficient sealing properties, and those in which the silica gel changed in color were considered to have no sealing properties.

Example 2 The concave portion 6 of each shell 5.5 of the support body 2 formed in the same manner as in Example 1 was filled with an ultraviolet curable resin composition 3 prepared as described below to form a coating material for the connecting member. did.

Line-curable resin composition Acrylic ultraviolet curable resin (TB3042C9 @ Three Bond) was mixed with fine powder silica (Aerosil R-972, manufactured by Nippon Aerosil ■) as a gelling agent, and resin/gelling agent = 85/15. A jelly-like ultraviolet curable resin composition was obtained by blending in the following proportions.

Then, in the above jelly-like ultraviolet curable resin composition 3, the 7-shaped joint of the joint conductor S similar to that in Example 1 was filled into the support 2 of the coating material 1 in the same manner as in Example 1. After fixing the two shells 5, 5 of the support 2, the coating material 1 holding the bonding conductor 9 was irradiated with ultraviolet rays under the irradiation conditions shown in Table 1 to remove the coating material 1. The ultraviolet curable resin composition 3 filled in the support 2 was cured.

The bonded wire obtained by sealing the bonded portion of the bonded conducting wire 9 in Example 2 with the coating material 1 was subjected to the following evaluation test, and the results are shown in Table 1.

Inuritsuki 1 Using the support 2 formed in the same manner as in Example 1 and the prepared ultraviolet curable resin composition, apply the ultraviolet curable resin composition 3 into the recess 6 of each shell 5, 5 of the support 2. Filled 6 Thereafter, as in Example 1, the 7-shaped joint of the joint conductor 9 was buried in the jelly-like ultraviolet curable resin composition 3 filled in one shell 5 of the support 2, and then the support The ultraviolet curable resin composition 3 is applied before closing the other shell 5 which becomes the lid of the body 2.
The surface of the support 2 was preliminarily irradiated with ultraviolet rays, and then the shell 5 serving as the lid of the support 2 was closed.

In addition, this preliminary irradiation with ultraviolet rays is important because in cationic polymerization type photopolymerization, the catalyst that has been irradiated with light is dissociated by a dark reaction, and then the reaction proceeds gradually in the dark. The light irradiation after closing the shell 5 promotes sufficient reaction of the ultraviolet curable resin composition in the shape or inside.

Subsequently, the covering material 1 holding the bonding conductor wire 8 is irradiated with ultraviolet rays under the irradiation conditions shown in Table 1 using an ultraviolet irradiator (Model DHD-500CM, manufactured by Oak Co., Ltd.) to support the covering material 1. The ultraviolet curable resin composition 3 filled in the body 2 was cured.

The bonded wire obtained by covering the bonded portion of the bonded conducting wire 8 obtained in Example 3 with the coating material 1 was subjected to the same evaluation test as in Example 1, and the results are shown in Table 1.

Comparative Example 1 As in Example 1, as a connecting member, about 10 nw++ of the polyvinyl chloride coating layer at the tips of two joining conductors was removed,
The bare wire portions were joined together by soldering it to form a joined conductor wire 9 having a joint portion shaped like a 7 as shown in FIG.

Next, apply electrically insulating polyvinyl chloride adhesive tape (Nislon No., 360° Block Chemical Industry Co., Ltd.) to the joint of the joint conductor 3.
Co., Ltd., trade name) was rolled into six layers.

In Comparative Example 1, the bonded wire material obtained by wrapping the insulating tape around the joint part of the bonded conductor wire and sealing it was checked for workability and subjected to a sealability evaluation test in the same manner as Example 1 described in h. The results are shown in Table 1. It was shown to.

Table 1 Example 4 A foamy hot melt agent was filled inside a support to form a covering material for a connecting member. The support, hot melt agent, coating method, and connecting member are as follows.

(Support) A shell-shaped support shown in FIG. 1, which was formed from a polypropylene sheet (manufactured by Dainippon Ink and Chemicals Co., Ltd.) with a thickness of 0.8 layers wi using the vacuum forming method in the same manner as in Example 1. 2 was used.

(Hot melt agent) Ethylene vinyl acetate polymer as sealant 3; TB
X-36-122 (manufactured by Three Bond Co., Ltd., trade name) was used.

(Coating method) Foam hot melt agent dispensing device (foam melt applicator FM151.N0RDSON, INC, U
Mix N2 gas into the hot melt agent using
Support 2 at a discharge temperature of 130°C and a foaming ratio of 1.5 times.
Approximately 1.6 to 1.7 cc was discharged and filled into the recess 6 of each shell 5, 5 to form the covering material 1.

Next, a connecting member was embedded in the covering material 1 obtained above as described below.

As a connecting member, the same conductor as in Example 1 (TR-64X
A bonded conducting wire made by bonding two 10-type (trade name, manufactured by Shinagawa Electric Wire Co., Ltd.) was used. Approximately 10 nm of the polyvinyl chloride coating layer at the tips of the two connecting conductive wires is removed, and the bare wire portions are joined by soldering or electrothermal welding to form a Y-shaped joint as shown in Figure 5. A bonded conducting wire S was formed.

After embedding the 7-shaped joint of the joint conductor S in the foam-like hot melt agent 3 filled in one shell 5 of the support 2, the other shell 5, which will become the lid of the support 2, is embedded. It was designed to fit into the gap between the closed joint conductor wires 9.

Comparative Example 2 After filling the support 2 with a non-foaming hot-melt agent (the same heat-melted hot-melt agent as in Example 3, but not foaming), a figure 7 shape as a connecting member similar to Example 1 was filled. After embedding the joint of the joint conductor 9 in a hot melt agent filled in one shell 5 of the support 2, the other shell 5, which will become the lid of the support 2, is closed and cooled to room temperature. The hot melt agent was cured.

Regarding the coating material 1 in Example 4 and Comparative Example 2, workability was confirmed and mechanical strength was measured in the same manner as in Example 1 (Comparative Example 2).
(excluding 20%), evaluation tests were conducted to determine the presence or absence of sealing properties and the presence or absence of fluidity in the protruding portion, and the results are shown in Table 2.

Table 2 (Effects of the Invention) As explained above, by using the coating material of the present invention to cover the joints of connecting members such as electric wires, it is possible to perform sealing and covering operations in seconds. This will improve workability.

In addition, it fully adheres to the connecting parts of the connecting members and has excellent airtightness, improving sealing performance and completely waterproofing the connecting parts of the connecting members. For example, the connection of conductive wires forming a wire harness When used in a section, the number of lines can be reduced, and the number of buildings can be increased and space can be used more effectively.

Furthermore, it has high mechanical strength and excellent binding strength, and weather resistance and insulation properties are improved.

Furthermore, when a jelly-like UV-curable resin is used as a sealant, it can be used even in high-temperature atmospheres of around 120°C, has a long open time, and does not leak even when filled into a support, making it easier to work. improves.

In addition, when a foam hot melt agent is used as the sealant, it is more economical and does not require any special tools other than a foam hot melt dispensing device. It can be applied to many areas, and there is no need for temporary fixing.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the covering material of the connecting member showing the first embodiment of the present invention, FIGS. A plan view showing an example of the connecting part of the connecting member, FIGS. 6rA to S are perspective views illustrating a method of covering the connecting member with the covering material, and FIG. 10 similarly shows another example of the support. FIG. 11 is a perspective view of a covering material of a connecting member according to a second embodiment of the present invention, FIG. 12 is a perspective view of its support, and FIG. 13 is a connecting member using the covering material. FIG. 3 is a perspective view for explaining a coating method. FIGS. 14 to 16 are a front view showing another example of the support and a side sectional view showing its different state. 1.11...Covering material 2.10, 12.17...Support 3.13...Sealant 8...Joining conductor (connecting member) Applicant: ThreeBond Co., Ltd. 1st figure 2 2nd 4 Atsushi 50 No x 60 No. 37) Oi b Part 11/J7 4 Io 12ffj No. 14 Zu Yumino 5F? 7 father-in-law 16 children

Claims (1)

[Scope of Claims] 1. A covering material for a connecting member that covers a connecting portion of a connecting member, characterized in that the inside of the support is filled with a sealant. 2. The coating material for a connecting member according to claim 1, wherein the sealant is a jelly-like ultraviolet curable resin composition and the support is a plastic molding that can transmit ultraviolet rays. 3. The covering material for a connecting member according to claim 1, wherein the sealant is a foamy hot melt agent and the support is a plastic molded product. 4. The covering material for a connecting member according to any one of claims 1 to 3, wherein the support body has a shell structure. 5. The covering material for a connecting member according to any one of claims 1 to 3, wherein the support is a cylindrical body with a slit formed therein.