JPH05275126A - Piercing crack resistance performance reinforced seal pad material - Google Patents

Abstract

PURPOSE: To enhance piercing crack resistance performance by arranging specified reinforcing material. CONSTITUTION: Reinforcing material 6 is disposed between a base material sheet 1 and a seal pad 2. The width of the reinforcing material 6 is caused to be narrower than that of the pad 2 so that the same is held by the bonding of the pad 2 and the sheet 1, or the bonding with the sheet 1 may be secured by applying adhesive to the face of the material 6 itself. The reinforcing material 6 has elongation of 1 to 75% measured by an ASTMD 100 method and piercing crack strength of 1 to 3kgf by a 3M test method ETM 29011 method, and a reinforcing area is set to be 30 to 125% of a seal pad 2 area on the base material. The thickness of the reinforcing material 6 measured by the ASTMD 1000 method is 50 to 250μm. Thereby, piercing crock resistance performance can be enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal pad material having enhanced burst resistance.

[0002]

2. Description of the Related Art Conventionally, a method of winding an adhesive tape or a self-fusing tape a plurality of times has been used as an electric insulation treatment of an electric wiring connecting portion in an automobile or the like. However, in this method, not only the skill level of the operator is required, but also the water and moisture resistance is poor. Also,
There was also a method of applying moisture-proof putty to the connection part in advance, and then wrapping the adhesive tape multiple times over it, but this requires more skill, the work becomes more complicated, and the putty material sticks out. There was also.

Therefore, it has been proposed to use a seal pad material in which a seal pad is provided on a base material sheet of a predetermined size so as to have two or more edge portions (Japanese Patent Laid-Open No. 1-206573). .. The method using the seal pad material has the advantages that it is easy to work, has high electrical insulation, waterproof and moisture-proof effects, and can be automated. However, when the electric wiring part is extremely large, when the wiring connection is poor and the copper wire is protruding, or when the electric wiring that has been subjected to the mastic pad treatment is stacked in several stages, pressure is applied and the base sheet There was a problem that it was easy to poke and shake.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention is intended to provide a seal pad material in which the base sheet is not torn even in the above-mentioned special use condition.

[0005]

As a result of various studies to solve the above-mentioned problems, the inventors of the present invention have arranged a reinforcing material satisfying specific requirements so as not to impair the original function of the seal pad. The present invention has been completed by finding that the burst resistance can be improved. Therefore, the present invention is a seal pad material having a base material seal and a seal pad layer attached to one surface of the sheet, wherein a reinforcing material is provided,
The reinforcing material has a thickness of 50 to 250 μm measured by the ASTM D1000 method, an elongation of 1 to 75% measured by the ASTM D1000 method, and a 3M test method ETM2901.
A seal pad material having a burst strength of 1 to 3 kgf measured by Method 1 and having an area of the reinforcing agent of 30 to 125% of an area of a seal pad on the base sheet. To do.

[0006]

EXAMPLES The structure and method of use of the seal pad material of the present invention other than the reinforcing material are described in detail in JP-A-1-206573. The outline is shown in FIG.
In FIG. 1, reference numeral 1 is a base sheet having elasticity, and a seal pad 2 is arranged on one surface of the sheet. In use, an electric wire 3 connected by, for example, a connecting tool 4 is arranged on the surface of the pad, and then this electric wire and its connecting portion are wrapped by the pad 2 and the sheet 1 as shown in FIG. 1B, The adhesive tape 5 adheres and fixes. Then, by externally applying pressure to the pad enclosing the electric wire, the pad also penetrates into the fine gaps of the electric wire and its connecting portion, and the connecting portion is completely edged and moisture-proofed from the outside.

However, in the special cases mentioned above, the base sheet may be torn by the protruding end of the electric wire or the corner of the electric wire connector. In order to prevent this, a reinforcing material is provided at an arbitrary position in the seal pad material of the present invention. As a preferable installation position of the reinforcing material, as shown in FIG. 2, the reinforcing material 6 is arranged between the base material sheet 1 and the seal pad 2, or as shown in FIG.
Outer surface, that is, the surface of the base sheet opposite to the surface in contact with the seal pad, and preferably the adhesive tape 5
The reinforcing material 7 is arranged inside. The stiffener can also be placed in both of the above positions.

The reinforcing material 6 is attached to the seal pad 2 and the base sheet 1.
In the aspect of arranging between the pad and the base sheet 1, the width of the reinforcing material 6 may be narrower than that of the seal pad 2 as shown in FIG.
Alternatively, the surface of the reinforcing material 6 itself may be coated with an adhesive material to secure the adhesion with the base material sheet 1. In the latter case, the width of the stiffener 6 does not have to be narrower than that of the pad 2 and may extend beyond the edge of the pad 2. When the reinforcing material 7 is arranged outside the base material sheet 1 as shown in FIG. 3, the reinforcing material 7 and the base material sheet 1 are bonded to each other with an adhesive. When the reinforcing material 7 is arranged outside the base sheet, the width of the reinforcing material 7 may be wider or narrower than that of the base sheet 1.
That is, the area of the reinforcing material may be sufficient as long as it covers the electric wiring connecting portion. Specifically, 30 to 125% of the area of the seal pad 2 is preferable. This is because if it is less than 30%, the bursting resistance cannot be improved, and if it exceeds 125%, the watertightness and the bonding strength are poor.

The reinforcing material of the present invention must have the following properties. The thickness measured by the ASTM D-1000 method is 50 to 250 μm. Test at room temperature (1
0 to 30 ° C.) and a relative humidity of 50 to 80%. After the sample is left at room temperature for 24 hours or more, it is cut off from the end by 500 mm or more, a test piece of 475 mm is taken for each winding, and 10 points are measured with a dial gauge at substantially the same intervals in the length direction, and an average value is obtained. If the thickness is less than 50 μm, the reinforcing effect is poor,
If it exceeds 250 μm, the bonding strength and the watertight performance will be deteriorated.

Further, a reinforcing material having an elongation measured by the ASTM D-1000 method of 1 to 75% is applicable to the present invention. As described above, after cutting off 500 mm or more from the end, a 127 mm long test piece is cut off, a central point is marked with 50 mm intervals, a grip interval of 100 mm is pulled at a speed of 300 mm / min, and the elongation at cutting is obtained. Elongation (%) is calculated by the following formula.

[0011]

[Equation 1]

[0012] L _I: spacing of the first gauge L _e: the stronger the elasticity of the reinforcing material at intervals less than 1% of the gauge at the time of cutting, there is a possibility that bonding strength is inferior, and when it exceeds the other 50%突裂Performance decreases. The burst strength measured by 3M test method ETM29011 is 1 to 3 Kgf. Place the subject (reinforcing material) on the scale, and then place a cone with a metallic projection of 1 / 16R and a length of 3 mm at the tip, and apply a downward force to the cone so that the subject The force at the time of breakthrough is measured with a scale. If it is less than 1 Kgf, the bursting performance is inferior, and if it exceeds 3 Kgf, the elasticity of the reinforcing material becomes strong and the laminating strength may be inferior.

The material of the reinforcing material of the present invention is not particularly limited as long as the above requirements are satisfied. For example, a cloth, a non-woven fabric or a film made of polyester, acrylic, polypropylene, glass, ceramic fiber or the like or a laminate thereof. Or, an adhesive tape in which an adhesive is applied to these is used. Additives such as a flame retardant, an antistatic agent, an antioxidant, titanium oxide, a coloring agent, and a release treatment agent may be added to these, or they may be treated with these. The pressure-sensitive adhesive tape is particularly preferable for facilitating lamination with the substrate sheet, and as the pressure-sensitive adhesive tape, for example, Scotch tape NET801, # 10, # 69 (all manufactured by Sumitomo 3M Limited) can be used.

[0014]

EXAMPLES Next, the present invention will be described more specifically with reference to Examples and Comparative Examples. Evaluations in these examples and comparative examples were performed as follows. (1) Characteristic test of reinforcing material The thickness was measured by a dial gauge according to ASTM D1000.

Stretch measurement: A tensile tester was used to measure according to ASTM D1000. Bursting strength In accordance with the 3M test method ETM-29011, a metal tip has a cone with a protrusion of 1 / 16R and a length of 3 mm on the scale, and the tip of the cone has a surface such as a film as a reinforcing material. Then, the force was applied downward and the force when the film or the like broke through was measured.

(2) Practical test Bursting test The electric wire crimping portion subjected to the seal pad treatment by the above method is crimped using a press machine at room temperature, pressure of 5 Kgf / cm ² , and time of 5 seconds to obtain a base material. The number of presses until the tape was broken and the tape was electrically connected in the vertical direction was measured.

Water- tightness test A vinyl-coated electric wire is passed in water from the end to the electrical wiring connecting portion which has been subjected to the seal pad treatment by the above method.
The air pressure of kg / cm ² was applied, and the time until the air leaked was measured. Lamination test The electric wire / wiring connection portion that had been subjected to the seal pad treatment by the above method was dipped in hot water at 80 ° C, and the time until the laminated portion was peeled off was measured.

Example 1. A Scotch tape NET801 (manufactured by Sumitomo 3M Limited) having a size of 5 cm in length and 3 cm in width and a thickness of 50 μm and having an area of 75% of the seal pad was adhered. Then, a seal pad (mastic) having a thickness of 2 mm was transferred to the tape side so as to have three edge portions of 7 mm from the top, and the seal pad device of the present invention was obtained.

Then, 3 vinyl-coated electric wires having a diameter of 2 mm are used.
A main connection was made, and the above-mentioned seal pad material was wound around the connection portion at a room temperature under a pressure of 15 Kgf / cm ^{2 for} a time of 5 seconds. Example 2-11. The same experiment as in Example 1 was conducted by changing the type and thickness of the reinforcing material. The results are shown in Table 1.

[0020]

[Table 1]

Note: SCOTCH NET801 TAPE: SCOTCH # 10 TAPE: SCOTCH # 69 TAPE: Acetate cloth: PET film: PET non-woven fabric: PET cloth: SCOTCH # 23 TAPE: SCOTCH # 58 TAPE: NYRON: Example (50 mesh) 12-17. The same experiment as in Example 1 was conducted by changing the size and position of the reinforcing material with respect to the seal pad area. The results are shown in Table 2.

Comparative Example 1-13. It is an example in which the thickness, spread, burst strength, size and position of the reinforcing material deviate from the specific range of the present invention. The results are shown in Tables 1 and 2.

[0023]

[Table 2]

Note: MIDLE, B in the position column in Table 2
ACKING and MASTER have the following meanings. MIDDLE: The reinforcing material is inserted between the base material sheet and the seal pad. BAKING: The reinforcing material is arranged on the surface of the base sheet opposite to the surface in contact with the seal pad.

MASTER: The reinforcing material is arranged on the surface of the seal pad (the surface opposite to the surface in contact with the base sheet). As is clear from the comparison between the above-mentioned Examples and Comparative Examples, only the reinforcing material satisfying the requirements defined in the present invention can improve the burst resistance while maintaining the watertightness, the bonding strength and the like.

[Brief description of drawings]

FIG. 1 shows the structure of a prior art seal pad material and its method of use. The method of use is the same as the seal pad material of the present invention.

FIG. 2 shows an example of a seal pad material of the present invention.

FIG. 3 shows an example of a seal pad material of the present invention.

[Explanation of symbols]

 1 ... Substrate sheet 2 ... Seal pad 3 ... Electric wire 4 ... Electric wire connection part 5 ... Adhesive film 6, 7 ... Reinforcing material

Claims (3)

[Claims] 1. A seal pad material having a base sheet and a seal pad layer attached to one surface of the sheet, wherein a reinforcing material is provided, and the reinforcing material is ASTMD100.
50-250 μm thickness measured by method 0, ASTM
Elongation measured by D1000 method 1-75%, and 3
A seal pad having a burst strength of 1 to 3 kgf measured by the M test method ETM29011 method, and the area of the reinforcing agent is 30 to 125% of the area of the seal pad layer on the substrate. Material. 2. The reinforcing material is polyester, acrylic,
The seal pad material according to claim 1, which is a cloth, a non-woven fabric, or a film containing polypropylene, glass, or ceramic fibers, or a laminate thereof. 3. The reinforcing material is provided between the base sheet and the seal pad layer, and / or on a surface of the base sheet opposite to a surface in contact with the seal pad layer. Or the seal pad material according to 2.