JPH06318407A - Sealing method - Google Patents

Abstract

PURPOSE:To provide a method for easily sealing even small gaps such as spacing between bundle-like electric wires with a remarkably excellent sealing property. CONSTITUTION:A polymer for restricting a soft phase with a hard phase is used as a sealant 1, which is wound by a tape 2 or the like so as to be intruded into clearances between bundle-like electric wires (a). The restricted structure of the polymer is broken by the use of a component of the electric wire, thus fluidizing a portion of the sealant in contact with the electric wire. A polymer having restricted structure of frozen phase structure and a hard phase of polystyrene is used preferably.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing method used for sealing a narrow gap such as a space between bundled electric wires by filling with a sealing agent.

[0002]

2. Description of the Related Art In a bundled electric wire, for example, a wire-harness or the like, a dam portion may be formed in the middle of the wire in order to prevent water running along the wire. Conventionally, for forming the dam portion, a method of pouring a curable liquid material into a narrow inter-line gap to cure the liquid material, a method of expanding the narrow inter-line gap and filling a putty material, and the like are known.

[0003]

However, in the former method, it is difficult to pour a liquid into a narrow gap unless the fluidity is good, and when the fluidity is good, the liquid will flow away. , Finding the point of harmony is not easy. For this reason, there is a place to be waterproofed in the case, a narrow gap is forcibly widened to pour liquid material,
After pouring the liquid material, prevent the outflow with tape etc.,
The curing reaction is carried out after the liquid material is made to flow into the narrow gap by heating or leaving it for a long time.

On the other hand, in the latter method, when the wires are bundled, it is difficult to let the putty material go around all the narrow gaps.

The seal method of the present invention is a seal method which has an extremely excellent sealing property and can be easily sealed even in a narrow space such as a space between wire bundles. To provide.

[0006]

The seal method of the present invention comprises:
A polymer that restrains the soft phase with a hard phase is used as a sealant, and the sealant is pushed into the gap between the sealed portions, and then the polymer from the polymer to be sealed is added as a component. The structure is characterized in that the restraint structure is destroyed and the sealing agent portion in contact with the object to be sealed is fluidized.In the polymer, the restraint structure is a frozen phase structure and the hard phase is polystyrene. Some can be preferably used.

[0007]

In the initial stage when the sealant is pushed into the sealant gap, even if a fine gap remains, the transfer component from the sealant pair (the restraining structure of the polymer of the sealant is destroyed). Component), the portion of the sealing agent in contact with the object to be sealed is fluidized due to the destruction of the constrained structure, and the narrow gap is completely filled with this fluidized product. Therefore, after the sealant is pushed in, excellent sealability is exhibited for a while.

[0008]

EXAMPLES In the present invention, the sealant is a polymer that constrains the soft phase in the hard phase, and is normally non-fluid because the soft phase is constrained. A material having fluidity is used in which the constrained structure is destroyed by a specific component transferred from the husk body.

As such a sealant, when the object to be sealed is a vinyl chloride electric wire, a restraint structure is destroyed by a transition plasticizer (D0P, DBP, etc.) from the vinyl chloride coating layer. Styrene-butadiene-styrene, styrene-ethylene-butylene-styrene, and the like, whose structure is a frozen phase and whose hard phase is polystyrene, can be preferably used.

According to the present invention, in order to form the dam portion on the bundle of electric wires, the sealing agent is adjusted to putty. A method using a solvent or a method of softening and flowing by heating can be used for this putty-like, and in the latter case, it is preferable to use a seal having a softening pour point of about 60 to 80 ° C. .

If the sealant is putty-like, it is shown in FIG.
As shown in FIG. 1, the putty-like material 1 is applied to the outer periphery of the bundled electric wire a by a spatula or the like, and further, as shown in FIG.
The tape 2 is wound around and the tape pressure is used to push the sealed object into the wire gap.

At this stage, the filling state of the putty-like material in the wire gap is incomplete, and the fine gap remains, so that the sealing property is insufficient. However, the plasticizer is gradually transferred from the electric wire coating layer portion in contact with the putty-like material to the putty-like material, and the portion of the putty-like material in contact with the plasticizer is fluidized by the destruction of the restraint structure, and the fluidized material Thus, the remaining small gaps are completely filled and excellent sealing property is exhibited.

In order to ensure waterproofness, the sealant is required to have a contact angle with water of 90 ^° or more, and such waterproofness can be easily achieved by adding oil. The amount of the oil added is the above-mentioned polymer-100.
It is preferably 10 to 95 parts with respect to parts (parts by weight, the same applies hereinafter).
If more than one part, it will be difficult to hold when applied.) Of course, an oil is selected that does not destroy the restraint structure.

According to the seal method of the present invention, even in a narrow gap such as a gap between bundled electric wires, a seal is applied and a tape is wound on the seal. An extremely excellent sealing property can be secured by a simple operation of pushing the coated putty into the gap between the wires. This can be confirmed by comparing the following examples and comparative examples.

EXAMPLE A bundle of electric wires used was a bundle of 100 vinyl chloride wires. The putty-like material has a frozen structure as a constrained structure, polystyrene as a hard phase, and polybutadiene as a soft phase. 100 parts of styrene-butadiene-styrene with 10 parts of oil added, and 100 parts of the same styrene-butadiene-styrene with oil. Three types were used, one containing 100 parts and the other containing 6 parts of styrene-butadiene-styrene and 100 parts of oil.

In any of the examples, the sealing property immediately after winding the tape was extremely low, but the sealing property after 12 hours from the winding was extremely excellent. When disassembled and observed, the putty-like material completely wrapped around the lines.

Comparative Example The same electric wire as in the example was used for the bundled electric wire,
100 parts of polyester type (constraint structure is crystalline phase, hard phase is polyester, soft phase is polyol) 100 parts of oil is added, polyurethane type (restraint structure is hydrogen bond and crystalline phase, hard phase is urethane structure, Soft phase is poly
2) 100 parts of oil added with 100 parts of oil were used.

In each of the comparative examples, the sealing property is extremely low not only immediately after winding the tape but also after 12 hours from the winding. There were many gaps left between them.

[0019]

According to the sealing method of the present invention, an extremely excellent sealing property can be ensured only by pushing the putty-like material into the gap with the tape winding pressure, and the space between the bundle-shaped electric wires can be secured. Even a narrow gap such as a gap can be easily and surely sealed.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of the present invention, in which (a) of FIG. 1 shows a sealant after being applied to a sealing target and (b) of FIG. The figure shows the time when the sealant is pushed in.

[Explanation of symbols]

 a bundled electric wire 1 coated sealant 2 winding tape

Claims (2)

[Claims] 1. A polymer for binding a soft phase with a hard phase
Used as a sealing agent, the sealing agent is pushed into the gap between the sealed portions, and then the polymer is added with the components from the sealed body.
The sealing method is characterized by destroying the restraint structure and fluidizing the portion of the sealing agent in contact with the object to be sealed. 2. The sealing method according to claim 1, wherein the constrained structure is a frozen phase structure and the hard phase is polystyrene.