JP3510332B2 - Adhesive tape for repairing corroded parts - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive tape used for repairing a corroded portion on a metal surface.

[0002]

2. Description of the Related Art Various metal coatings such as a power supply box made of a coated steel plate, a power distribution box, a building structure, and the like, which are installed outdoors, are liable to be peeled off and corroded on the metal surface. Conventionally, as a method for repairing a corroded portion on a metal surface, a method of applying a paint to the corroded portion or a method of attaching a metal plate to the corroded portion and coating the metal plate on the corroded portion has been performed.

However, only the coating of the corroded portion has a short anticorrosion effect, and repairing by attaching the metal plate requires a lot of time and labor to process the metal plate and easily causes a gap. There is a problem of doing.

In addition to the above, a method of attaching a tape or sheet of vinyl chloride resin, polyethylene or the like is used because the work is easy. However, aesthetically, when a coating is applied on the surface of these plastics, the paint may be easily peeled off on the surface of these plastics, and the appearance of the painted surface may be impaired.

A tape having a non-woven fabric provided with a pressure-sensitive adhesive layer is known as a material having good adhesiveness to paint, but it is easy to let water pass through and cannot prevent rainwater from entering. In addition, the solvent of the applied coating penetrates into the non-woven fabric and the adhesive strength is reduced, which adversely affects the adhesive layer. On the contrary, there are problems that the components in the pressure-sensitive adhesive are dissolved in the coating layer and act on the coating layer, which delays the drying of the coating material and leaves the coating film sticky.

[0006]

DISCLOSURE OF THE INVENTION The present invention is an adhesive for repairing a corroded part, which can easily repair a corroded part on a metal surface, which is excellent in waterproof property, adhesion of paint and good adhesion to a metal surface. The tape is provided.

[0007]

[Means for Solving the Problems] That is, the present invention is an adhesive tape for repairing a corroded part, which comprises a substrate and an adhesive layer, wherein the substrate comprises a nonwoven fabric and a plastic film, and the adhesive film is adhered to the plastic film side. A pressure-sensitive adhesive tape for repairing a corroded part, which is characterized in that an agent layer is provided.

An adhesive tape for repairing a corroded part (hereinafter simply referred to as an adhesive tape) of the present invention comprises a substrate 1 and an adhesive layer 2 as shown in FIG. 1, and the substrate 1 comprises a nonwoven fabric 1a and a plastic film 1b. Become.

The material of the nonwoven fabric 1a of the present invention is not particularly limited, but for example, polyester,
Examples thereof include polyamide, polyolefin, rayon, and vinylon, and from the viewpoint of strength and heat resistance, polyester-based or polypropylene-based spunbonded nonwoven fabrics are preferably used.

It is preferable that the non-woven fabric is mainly composed of resin fibers having a flat cross section, and the non-woven fabric has a resin fiber having a basis weight of 30 g / m ² or more and a thickness. Those having a thickness of 0.3 mm or less are preferable in terms of strength, adhesiveness of paint, and water blocking property.

As the non-woven fabric mainly composed of fibers having a flat cross section, for example, Unitika 20701 FLV (spunbond made of polyester, basis weight 70 g / m ² ) and product name 20551 FLV (made of polyester) are available from Unitika Ltd. Spunbond, basis weight 55 g / m ² ) Product name 204
57FLV (polyester spunbond, basis weight 45g
/ M ² ) and the like are commercially available.

As the plastic film 1b of the present invention, for example, a plastic film of polyethylene, polypropylene, polyvinyl chloride, nylon, polyester or the like is used, but it is not limited as long as it has water resistance and resistance to a solvent during coating. .

The thickness of the plastic film is not particularly limited as long as the water resistance and solvent resistance are not impaired, but it is practically about 0.005 to 0.1 mm.

This plastic film is attached to the non-woven fabric via an adhesive or the like or by a heat fusion method.

The pressure-sensitive adhesive used in the pressure-sensitive adhesive layer 2 of the present invention is not particularly limited, but natural rubber-based, synthetic rubber-based such as chloroprene rubber, styrene-butadiene rubber and butyl rubber, acrylic-based adhesive, etc. Larger ones are preferred.

The thickness of the pressure-sensitive adhesive layer is not particularly limited, but is preferably in the range of 0.1 to 0.5 mm from the viewpoint of tackiness.

[0017]

In the pressure-sensitive adhesive tape of the present invention, since the plastic film is interposed between the non-woven fabric and the pressure-sensitive adhesive layer, it is possible to prevent water from entering the pressure-sensitive adhesive layer or the metal surface, which causes corrosion. Furthermore, since the adhesive tape has a non-woven fabric on the surface, the adhesiveness of the paint is good.

[0018]

EXAMPLES The present invention will be specifically described below with reference to examples.

Example 1 Nonwoven fabric A (manufactured by Toray Industries, Inc., H2070: spunbond made of polyester, basis weight 70 g / m ² , thickness 0.17 mm,
Resin fiber cross-sectional shape circular) and polyethylene film (Mitsubishi Yuka Co., Ltd., Yucaron ZF53: thickness 0.05m)
m) was attached by heat fusion, and then a synthetic rubber adhesive was attached to the polyethylene side by a calendering method to a thickness of 0.28 mm to produce an adhesive tape of Example 1.

Examples 2 and 3 Nonwoven fabrics and plastic films shown in Table 1 were adhered via an adhesive, and an adhesive tape of Example 2 was prepared by a calendering method in the same manner as in Example 1. The pressure-sensitive adhesive tape of Example 3 was produced by the solvent coating method.

Comparative Example 1 A plastic film shown in Table 1 was coated with an adhesive,
An adhesive tape of Comparative Example 1 was produced.

Comparative Example 2 Vinyl Tape (Vinyl Tape No. 21 manufactured by Nitto Denko)
Was used as the adhesive tape of Comparative Example 2.

Comparative Example 3 A non-woven fabric B was coated with an adhesive to prepare an adhesive tape of Comparative Example 3.

Evaluation The characteristics of the adhesive tapes of Examples 1 to 3 and Comparative Examples 1 to 3 were evaluated by the following measuring methods. The results are shown in Table 1. Tensile strength: According to JIS K6301. Adhesive strength: In the adhesive strength test of JIS Z 0237, the 180 degree direction peeling adhesive strength to the test plate was measured. Adhesion of paint: Adhesion test of JIS K 5400, by X-cut tape method. An evaluation score of 6 or more was accepted. Water resistance: According to JIS K 5400 water permeability test. Stick the sample adhesive tape on the iron plate, 5m in the center of the adhesive tape
Coating was carried out by providing an uncoated portion of mφ, and evaluation was judged by the amount of water permeation after 24 hours, and 2 ml or less was regarded as acceptable. Appearance of painted surface: Visually Good to good gloss ◎,
◯, Δ, and ×. The degree of roughness on the finger surface was evaluated as ⊚, ○, and △, and the one with stickiness was evaluated as ×.

[0025]

[Table 1]

As can be seen from Table 1, the adhesive tapes of Examples 1 to 3 use a non-woven fabric-plastic tape adherend as the base material of the adhesive tape, so that water penetration in the vertical direction, Infiltration can be prevented, and water resistance has passed. Also, the adhesion of the paint is good, and the appearance of the painted surface is also good. In particular, in the case of using the non-woven fabric having a flat resin cross-sectional shape of Example 2, the non-woven fabric surface had less fluffing, and the coated surface had the best appearance.

Comparative Examples 1 and 2 are adhesive tapes in which the base material of the adhesive tape is a plastic film only. The water resistance and the appearance of the painted surface were good, but the adhesion of the paint was poor.

Comparative Example 3 is an adhesive tape in which the base material of the adhesive tape is only a nonwoven fabric. The paint adhesion was good, but the water resistance was poor, and the painted surface felt tacky and the appearance of the painted surface was poor.

[0029]

The pressure-sensitive adhesive tape of the present invention has a plastic film interposed between the nonwoven fabric and the pressure-sensitive adhesive layer.
Prevents penetration and entry of water in the vertical direction, maintains adhesion to the metal surface for a long time, and can maintain the anticorrosion effect for a long time. Furthermore, since the adhesive tape has a non-woven fabric on the surface, the adhesiveness of the paint is good, and when the paint is applied on it, the appearance of the painted surface is not impaired.

[Brief description of drawings]

FIG. 1 is a conceptual sectional view for explaining an adhesive tape of the present invention.

[Explanation of symbols]

1 base material 1a Non-woven fabric 1b plastic film 2 Adhesive layer

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) C09J 7/02 B32B 27/00

Claims (2)

(57) [Claims] 1. A pressure-sensitive adhesive tape for repairing a corroded part, comprising a base material and an adhesive layer, wherein the base material is formed by an adhesive or a heat fusion method.
A pressure-sensitive adhesive tape for repairing a corroded part, which comprises a non-woven fabric and a plastic film adhered together, and a pressure-sensitive adhesive layer is provided on the plastic film side. 2. The adhesive tape for repairing a corroded part according to claim 1, wherein the non-woven fabric is mainly composed of resin fibers having a flat cross section.