JPH057827B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention connects multiple electric wires with connecting devices such as connectors and sleeves, and prevents water such as rainwater from entering into the insulating cover placed around these wires. This article relates to a waterproofing method to prevent this.

(Prior art) Conventionally, in order to prevent rainwater from entering the insulating cover and corroding the exposed wire connections, a method has been adopted in which the insulating cover is filled with hard resin or hard foamed resin. .

(Problem to be solved by the invention) However, with wires filled with hard resin or hard foamed resin, when the wire bends, the resin at the connected core wire part peels off, creating gaps, and rainwater etc. can enter through the gaps. , there is a risk of corroding the electric wires.

(Means for Solving the Problem) In order to solve this problem, the present invention uses a flexible urethane elastomer to flexibly follow the bending of the wire and prevent it from peeling off. One method is to use a pair of handy-type flexible container A containing a polyol component and container B containing an isocyanate component.The lids of both containers are removed, and container B is inserted into the opening of container A. After connecting the openings by inserting them and thoroughly shaking them up and down or left and right to mix, release the connection and fit the lid with a nozzle into the opening of container A.
deforming the telescoping container by pushing its outer wall;
A simple method was established to discharge and fill the insulating cover with urethane elastomer using the internal pressure generated at that time to make it waterproof.

Next, the polyol component and isocyanate component, which are components of the container and the flexible urethane elastomer used in this invention, will be explained in detail.

The container used in this invention is a pair consisting of a stretchable container A for containing a polyol component and a container B for containing an isocyanate component. It is a container that can be connected by inserting the opening of container B with the lid removed, and can be shaken up and down or left and right in the conventional way. This is a container configured so that when pressure is applied by pushing the outer wall of the container A, the expandable container A deforms and the internal pressure generated can be used to discharge the liquid inside the container A. The materials constituting these two containers can be any material as long as it can provide the intended function of the container.From a technical and economic standpoint, container A is generally made of rubber. Or plastic container B
It is preferable to use a container made of glass or plastic.

Next, the polyol component and isocyanate component, which are constituent components of the urethane elastomer used in this invention, will be explained. That is, the polyol component is composed of mixed components such as a castor oil polyol, a polybutadiene polyol, a polyether polyol, a plasticizer, and a catalyst. Castor oil-based polyol is a special polyol derived from castor oil that contains about 90% ricinoleic acid, has a functional group number of 2 to 2.3, a molecular weight of 500 to 900, and a viscosity (25 ℃) is 180 to 350 cps. Polybutadiene polyol is a liquid polybutadiene polyol with an active hydroxyl group terminal and a molecular weight of 2000 or less and a viscosity (25℃) of 2 to 3 functional groups.
Use something below 2000cps. Polyether polyol is a functional group obtained by addition polymerizing a lower alkylene oxide having 2 to 4 carbon atoms, such as ethylene oxide and propylene oxide, to a compound with active hydrogen atoms such as propylene glycol, glycerin, and triethanolamine. 2~
4. Those having a molecular weight in the range of 1,000 to 3,000, such as glycerin/propylene oxide copolymer adducts having three functional groups and a molecular weight of 1,000 to 3,000.

Plasticizers are used to reduce the viscosity of the component system, such as dioctyl stalate, dibutyl stalate, and phosphoric acid esters such as cresyl diphenyl phosphate, tricresyl phosphate, and tricresyl ester. nylphosphate,
Examples include xylenyl diphenyl phosphate and triaryl phosphate.

The catalyst used in the urethanization reaction is, for example, a tertiary amine compound, an organometallic compound, etc. such as triethylenediamine, N,N'-dimethylethanolamine, diphenyldiaminomethane,
Examples include tin octylate and dibutyltin laurate. The amount used can vary within a wide range depending on the desired reaction rate.

The organic isocyanate compounds used as the isocyanate component include liquid MDI obtained by converting a part of 4,4'-diphenylmethane diisocyanate (MDI) into carbodiimide, tolylene diisocyanate, and those having a functional group number of 2 to 4 and a molecular weight of 3000 or less. Addition polymers obtained by adding a compound having an active hydroxyl group and performing addition polymerization to form a prepolymer may be used alone or in a mixture of two or more. The amount of the organic isocyanate compound to be used ranges from an amount stoichiometrically equal to the active hydroxyl group in the polyol component to about ±10% thereof, and the NCO index can be adjusted to 90 to 110.

(Example) Examples of this invention are shown below.

First, the ingredients of the urethane resin of this invention will be shown.

(Polyol component) Castor oil polyol 40 (2.2 functional, molecular weight 760) Polybutadiene polyol 40 (2.3 functional, molecular weight 1200) Glycerin phosphorus/propylene oxide copolymer adduct (trifunctional, molecular weight 3000) 20 Triethylenediamine 0.2 Tricresyl phos Hate 10 110.2 (Isocyanate component) Liquid MDI made by converting a part of 4,4'-diphenylmethane diisocyanate (MDI) into carbodiimide
(NCO 26% liquid) When the above polyol component and isocyanate component are mixed, a flexible urethane elastomer can be obtained.

Next, the electric wire connection waterproofing method of the present invention will be explained in detail with reference to the drawings.

First, as shown in FIG. 5, the coatings 3 and 4 of the electric wire 1 and the branch wire 2 are peeled off to expose the core wires 5 and 6, respectively, and the core wires 5 and 6 are tightened and connected using bolt connectors 7. Next, the insulating cover 8 is placed over this location, the mating edges 8a of the insulating cover 8 are locked and fixed, and the electric wires 1 on both edges of the cover 8 are
and the lead-out portion of the branch line 2 are closed by wrapping tape 9 (see FIG. 6). Then, a bellows-type container A containing 150 g of the polyol component prepared in advance as shown in Figure 1 and a container B containing 47 g of the isocyanate component.
Remove lids a and b, respectively, and connect the opening of container B by inserting it into the opening of container A, as shown in FIG. In this connected state, as shown in FIG. 3, after shaking thoroughly up and down or left and right to mix, the connection is released and the nozzle-equipped lid C is fitted into the opening of the container A, as shown in FIG. 4. The nozzle of the container A shown in FIG. 4 is inserted into the injection hole 10 of the insulating cover 8 as shown in FIG. Dispense and fill. Note that 11 in the figure is an air vent hole provided in the cover 8. As a result, the urethane reaction progresses over time and it adheres to the wire connection area.
Cured and flexible urethane elastomer 1
2 and exhibits a waterproof effect. Figure 8 shows the urethane elastomer 12 covered by an insulating cover 8.
Shows the state filled inside.

In the above embodiment, the container A is of a bellows type, but the container A is not limited to the bellows type, and may be of any type as long as the outer wall of the container A is recessed so that it can be expanded and contracted.

FIG. 9 shows another embodiment of containers A and B and a lid C with a nozzle, in which containers A ₁ and B ₁ are each made of synthetic resin, and both have thin outer walls 13 and are recessed inward. It is something that can be done. These containers A ₁ and B ₁ are connected, the outer wall 13 of container B ₁ is indented, the liquid inside is injected into container A ₁ , and then the cap of container A ₁ (not shown) is injected into the container A 1.
Sprinkle with water and shake to mix the two liquids inside.
The cap of the container A ₁ is removed, a lid C ₁ with a nozzle is attached, and the outer wall 13 inside the container A ₁ is dented to discharge the liquid inside the container A ₁ .

FIGS. 10 and 11 similarly show still other embodiments of the containers A and B and the nozzle-equipped lid C;
A ₂ consists of a container with a thin outer wall made of synthetic resin;
Frame 1 passed into opening 14 having outer peripheral threaded portion
A needle-like protrusion 16 is provided in the center of the container B 5, which protrudes upward from the upper edge of the opening 14. On the other hand, the container B ₂ consists of an ampoule-shaped container with a thin outer wall made of synthetic resin, and its bottom plate 17 is It is made of an extremely thin film, and has a lower outer edge 18 having an inner threaded portion on the outer circumference of the bottom plate 17. In this case opening 14 of container A ₂
Remove the cap 19 from the ampoule-shaped container.
The lower outer edge 17 of B ₂ is screwed onto the opening 14 of container A ₂ to cover it. Then, the needle-like protrusion 16 becomes the container B ₂
The liquid in container B ₂ flows into container A ₂ . At this time, the outer wall of the container B ₂ may be indented and poured. Then, shake the integrated containers A ₂ and B ₂ to mix the two liquids inside, break or cut off the tapered tip 20 of the ampoule-shaped container B ₂ to open an opening, and
The outer wall of A ₂ is pressed to make a dent, and the urethane elastomer 12 is discharged from the opening.

Further, FIG. 12 shows a bellows-type container based on the containers A and B described above, and the method of use is almost the same as in the above embodiment.

Further, in the above embodiment, a bolt connector is used as a connecting device for connecting a plurality of electric wires, but the present invention is not limited to this, and any suitable connecting device such as a bicon or a sleeve can be used.

(Effects of the Invention) By performing the above-mentioned waterproofing treatment by the method of the present invention, the insulating cover is filled with a flexible urethane resin, and the wire connection locations are covered with this, preventing rainwater from entering. Moreover, even when the electric wire at the location is bent, the urethane follows the movement of the electric wire, etc., and the urethane resin does not peel off or create gaps there. Therefore, rainwater does not reach the electric wires and connectors, making them completely waterproof. In addition, the treatment method of this invention is to separate the polyol component and isocyanate component constituting the urethane elastomer into containers A and B, respectively.
These containers A and B are stored separately on site, and these two liquids are mixed to make urethane elastomer. The waterproofing process is extremely easy. Therefore, it does not require any skill and can be processed by anyone.

[Brief explanation of drawings]

Figure 1 is a front view of containers A and B and a nozzle-equipped lid C used in this invention, Figure 2 is a front view of containers A and B being connected, and Figure 3 is a front view of containers A and B used in this invention. 4 is a front view of the same container A covered with a lid C with a nozzle, FIG. 5 is a front view showing the electric wire connection part of this invention, and FIGS. 6 and 7 are respectively FIG. 8 is a sectional view showing the waterproofed state of the present invention, and FIG. 9 is a cross-sectional view of the containers A, B and nozzle-equipped lid C used in the present invention. A front view showing another embodiment, FIG. 10 is a container A used in this invention,
A front view showing another embodiment of B, FIG. 11 is the 10th embodiment.
FIG. 12 is a plan view of container A shown in the figure, and FIG. 12 is a front view showing other embodiments of containers A and B used in the present invention. In the figure, 1 is an electric wire, 2 is a branch line, 5 and 6 are core wires, 7 is a bolt connector, 8 is an insulating cover, and 9
10 is a tape, 10 is an injection hole, 12 is a urethane elastomer, A and B are containers, and C is a lid with a nozzle.

Claims (1)

[Scope of Claims] 1. An insulating cover is placed to surround the area where a plurality of electric wires are connected with a connecting tool and the electric wires at the area adjacent to the connection, and a flexible urethane elastomer is injected into the insulating cover, and the inside of the cover is In the electric wire connection waterproofing treatment method in which the above-mentioned urethane elastomer is filled between the wire and the outer circumference of the electric wire and the connecting tool, the above-mentioned urethane elastomer is made by mixing a polyol component and an isocyanate component, and a handy type polyol component is added at the site. A flexible container A is connected to a container B containing the isocyanate component, and after mixing by shaking up and down or left and right, the connection is released, a lid with a nozzle is fitted into the opening of the container A, and the outer wall of the container is pushed. A method for waterproofing electric wire connections, characterized by injecting a mixed liquid into the insulating cover. 2 The polyol component has a functional group number of 2.
~4 and active hydroxyl group-terminated castor oil polyol with a molecular weight of 500-900, with a functional group number of 2-3 and a molecular weight of 2000
The following active hydroxyl group-terminated liquid polybutadiene polyol, the number of functional groups is 2 to 4 and the molecular weight is 1000 to 3000.
The isocyanate component contains two or more active isocyanate groups in one molecule. The method for waterproofing electric wire connections according to claim 1, characterized in that the method is an organic isocyanate compound.